SECTION 607 — MASS CONCRETE 600-35 SECTION 607 — MASS CONCRETE
607.01 Description.
This specification addresses the requirements for concrete used in mass concrete elements. Provide concrete proportioned for mass concrete applications that conform to SECTIONS 600 and 800 and the additional provisions in SECTION 607. Definition. Mass concrete is defined as any elements for which the concrete dimensions in three directions is 4 ft or greater. Requirements for mass concrete construction include laboratory testing, thermal modeling, temperature monitoring, and providing concrete temperature control before, during, and after placement. Perform a ll testing at a laboratory with recognized AASHTO accreditations for performing the required tests (AASHTO T22, AASHTO T23, AASHTO T121, AASHTO T152, ASTM C1064, ASTM C1074). The peak temperature is defined as the average of the values measured at any given time by the two temperature sensors placed at the location of the highest temperature as determined by the thermal model for the structural element. The highest acceptable peak temperature is 155°F. The differential temperature is defined as the difference in values measured at any given time between the temperature sensor(s) in any given location (or the average, if two sensors are placed in the location) in the structural element and the peak temperature as defined above. The highest acceptable differential temperature until the completion of temperature control is 35°F. The performance-based differential temperature is defined as a limit that changes as the concrete gains strength, determined as a function of the established maturity curve for the mix. This option may be considered by the Engineer, with the proper submission of an implementation plan for the process.
607.02 Materials and Equipment.
Concrete. Use concrete that meets SECTION 808 and SECTION 601. Do not use calcium nitrite-based corrosion inhibitor. Any proposed mixture adjustment that meets SECTION 601 for a new approval of the mix design will also require a new approval of the mass concrete temperature control plans per this specification. Temperature And Maturity Recording. Design p rimary temperature measuring loggers specifically for determining the maturity of concrete according to ASTM C1074. Operate the loggers in the range of 30°F to 212°F to an accuracy of ±1°F and internally record the time and temperature at a minimum of one-hour intervals for a minimum of 90 days. Ensure that each logger has a unique serial number and , upon download of the information using the compatible reader or other appropriate data connection, produce a secure, (unalterable) Windows PC-readable file that identifies the logger
Part 600 — Concrete August 2025
600-36 SECTION 607 — MASS CONCRETE by its serial number and the start date. Provide software to develop maturity curves to predict strength, and display the temperature versus time data for all loggers in a given placement. Size the data leads to reach from the logger ’s installed location to an accessible site where a handheld reader can be employed. A data cable that can connect the loggers to a notebook computer or other standard mobile device will be considered equivalent to a handheld reader, provided that a Windows PC-readable file can be created that can be transferred to a Windows PC. Provide a reader and necessary software for the exclusive use of the Engineer , which will become the property of the Department at the completion of the Project. Provide loggers that can use battery operated Wireless Remote Boxes for downloading of data. Ensure that the transmission range of the system can provide a reliable connection to both the Contractor’s and Engineer’s field offices. Provide a Windows PC-Compatible Wireless System Radio Base Station that can download the data file as described above. Maintain the Wireless System Radio Base Station for monitoring the mass concrete placement. Provide an additional Wireless System Radio Base Station for the Engineer’s field office, which will become the property of the Department at the completion of the Project. The Engineer may waive the requirement for a wireless communications system, if the Engineer determines that access to the placement is not warranted. Provide the Engineer with recording equipment that will allow intermediate downloading of measurements to a computer without restarting the logger, which will become the property of the Department at the completion of the Project. Provide a n automatic temperature monitoring system with email, phone, or text message alarm capability to notify the Contractor when temperature control limits are about to be exceeded. Submit technical literature on the complete maturity logger system, including the loggers, handheld reader, wireless system, software , and any other components to the Engineer for approval before the first mass concrete placement. This include s manufacturer contact information for the responsible technical representative and product performance history showing at least one year of successful use of the complete system on a minimum of three projects with mass concrete placements comparable to those within the scope of the Project. Provide contact information for the Project owners. Do not proceed with mass concrete placements until approval of the maturity logger system has been provided by the Engineer.
607.03 Construction.
Comply with the applicable construction requirements for SECTION 808 and SECTION 601, with the following additions. Submittals. Mass Concrete Temperature Control Plans. Submit a Mass Concrete General Temperature Control Plan for approval before the first mass concrete placement, stamped by a Rhode Island Registered Professional Engineer. Include the general procedures proposed for temperature control. Prepare a Mass Concrete Specific Temperature Control Plan for each unique placement , based on the general plan. For each specific temperature control plan , provide guidance, developed based on a concrete hydration
Part 600 — Concrete August 2025
SECTION 607 — MASS CONCRETE 600-37 temperature model to indicate when the peak and differential temperatures might exceed the specification limits. Provide specific concrete placement temperature restrictions based on anticipated ambient temperatures and other environmental factors, passive and active cooling, and insulation practices that could produce peak or differential temperatures that require remedial action. Provide guidance on appropriate remedial actions when concrete temperatures approach specification limits. At a minimum, ensure that the guidelines become effective when: • The concrete peak temperature reaches 3°F below the specification limit of 155°F. • The differential temperature reaches 2°F below the specification limit or the temperature value at the specified maturity for the variable differential limit (if approved). Submit e ach plan for approval before placement, stamped by a Rhode Island Registered Professional Engineer. Approval of any Mass Concrete Temperature Control Plan by the Engineer will not relieve the Contractor of its responsibility to maintain concrete temperatures within specification limits.
a.General Mass Concrete Temperature Control Plan . Provide a General Mass Concrete Temperature Control Plan that includes the following: ● Concrete mixture proportions, indicating aggregate sources and physical properties, cementitious material sources, and admixture product names and doses for each concrete mixture. Submit the Class MC concrete mixture design and prequalification test results for approval separately. ● Anticipated mass concrete placement schedule, including proposed concrete mixture adjustments for the full range of conditions that may occur during placement and curing operations. ● Test c oncrete temperature rise for each mixture directly in an adiabatic concrete calorimeter cast from laboratory trial batches using the same material sources and proportions as intended for use on the Project. ● Concrete compressive strength development in standard moist curing environment (73.5° ±3.5°F) at 3, 7, 14, 28, and 56 days for each mixture, based on the average of three 6 in. × 12 in. cylinders for each age. Cure the cylinders and test per AASHTO T22. Cast a temperature sensor in the center of two additional cylinders , and cure these cylinders alongside those used for compressive strength. Record the average temperatures of the cylinders hourly. Report the compressive strength and maturity for each specimen at each test age and the average values. ● Calculate and report the concrete strength development -maturity equation for each mixture from the standard cured strength results as described in ASTM C1074 , Estimating Concrete Strength by the Maturity Method. ● Perform demonstration mock-up(s) at least 60 days before the first scheduled mass concrete placement. Cast at least one mock -up to verify that the concrete thermal properties and temperature control procedures required for the Mass Concrete General Temperature Control Plan are adequate to meet the specification limits. For the mock -up(s), use the same concrete mixture proportions and materials, form
Part 600 — Concrete August 2025
600-38 SECTION 607 — MASS CONCRETE materials, curing materials, and monitoring devices defined in the General Temperature Control Plan, and use the same batching and placing operation to be used for the Project. Ensure that the mock-up is a cube or other element measuring 4 ft or more in the least dimension. Ensure that the t emperature monitoring of the mock-up is as specified in the General Mass Concrete Temperature Control Plan, and continue for at least seven days. At a minimum, insulate the demonstration mock-up with R-20 insulation on all sides. If alternative insulation, cooling, or curing options are proposed, cast a separate demonstration mock -up cube , instrumented for each alternative. The Engineer responsible for the design of the temperature control plan shall be present at the placement for each mock-up. For sensor placement, comply with the following: ● Locate two sensors at the center of the mock-up. Use the average of the two. ● Locate two sensors within 1 in. from the top surface located directly above the center of mass sensors. Use the average of the two. ● Locate two sensors within 1 in. from the center of a vertical face. Use the average of the two. ● Locate two sensors in an upper corner of the cube. Use the average of the two. ● Use one sensor to record the ambient temperature. Place this sensor at approximately 10 ft from the placement in a shaded area. Note: For a 5°F or greater variation between sensors of a paired set, or erratic variations or outright failure of a sensor, notify the Engineer immediately upon discovery of the problem. At the time of the notification, provide the Engineer with a course of corrective action for approval. If the approved corrective action requires that the data from one sensor in a pair no longer be used, use the other functioning sensor solely for the peak and maximum differential temperature measurements. From the concrete batched for the mock-up, conduct tests for air content (AASHTO T152), placement temperature (ASTM C1064 ), and unit weight (AASHTO T121) , and fabricate cylinders (per AASHTO T23) from the same concrete by an ACI Certified Concrete Field Technician Level I. Test the cylinders for compression strength by an AASHTO-accredited independent concrete testing laboratory (AASHTO T22) at 3, 7, 14, 28, and 56 days. Coordinate the mock-up with the Engineer, and provide the Department with at least one week advance notice of the casting date. Provide the Engineer with the opportunity to witness the placement and functioning of temperature recording se nsors before casting, and perform concrete property tests on companion samples selected by the Engineer. If a mix design has been approved for mass concrete placement before the scheduled first placement and the testing conforms to these standards, the Engineer may waive the requirements of Subsection 607.03.1.1(a) (first six bullets) . However, perform any requirements for testing/analysis added after the aforementioned mix design was approved, with the exception that mix designs previously approved using data derived from semi-adiabatic testing will not require re -testing per the above requirements. If the approved mix design has already had a mock -up performed previously and the criteria
Part 600 — Concrete August 2025
SECTION 607 — MASS CONCRETE 600-39 matches that for the applicable temperature control plan, the Engineer may accept the results of the previous mock-up instead of running a new one. Submit a letter report documenting the concrete properties and temperatures developed in the mock -up compared against the thermal analysis contained in the General Mass Concrete General Temperature Control Plan models as part of the General Temperature Control Plan. Outline any revisions/corrections required to the General Mass Concrete Temperature Control Plan for differing ambient conditions in the letter report. Strength results may be submitted separately. If the Project involves four or fewer unique mass concrete placement designs, the Engineer may waive the requirement for a General Mass Concrete Temperature Control Plan. If waived, ensure that the Specific Mass Concrete Temperature Control Plans meets all above requirements.
b.Specific Mass Concrete Temperature Control Plans . For e ach Specific Concrete Temperature Control Plan, include the following: ● Form and form liner R-value and anticipated time of form removal. ● Insulating material(s) R-value and anticipated periods of use. ● Curing procedure and duration. ● Provide thermal modeling analysis for typical placement scenarios. Ensure that the analysis incorporates: ○ A range of anticipated ambient placement temperatures ○ Anticipated water temperatures for active cooling ○ Effects of water temperature for placements in water ○ Effects of convection cooling in locations where high winds may be a factor ○ Anticipated concrete placement temperatures ○ Assumed R-values for concrete forms and insulation ○ Calculated maximum core and surface temperatures vs. time after placement Include the impact of planned construction activities, such as form removal, in the analysis. Estimate the concrete strength at form removal from the maturity relationship using the lowest calculated maturity value shown by the sensors placed within the concrete. ● Provide d rawings that identify the temperature monitoring locations for each placement and product data for all sensors and recording instrumentation. With the exception of the ambient sensor, install the sensors in pairs for the redundancy. Ensure that t he minimum number of automated temperature monitoring locations is nine per element for placements less than 500 cu yd and 17 per element for placements 500 cu yd or larger. Minimum sensor locations are noted below. Place each of the sensors in a pair in separate locations, no less than 6 in. and no more than 18 in. apart. For the mock-ups, the relative locations are as shown.
Part 600 — Concrete August 2025
600-40 SECTION 607 — MASS CONCRETE ○ Place two sensors in the center of thermal mass of the placement, where the peak temperature will occur. Determine this location based on the isocurves developed for the model, with the approval of the Engineer. Use the average of the two to determine the peak temperature at any given time and to measure the maximum temperature differential in the placement based on the difference between the peak temperature and each sensor location at any given time. Use the average of the two sensors. ○ Place two sensors at the location as determined by isocurves developed for the model that shows the point where the lowest temperature is predicted during temperature control. Use the average of the two sensors. ○ Locate two sensors within 1 in. from the top surface located directly above the center of thermal mass sensors. This location may be adjusted, based on the isocurves developed for the model, with the approval of the Engineer. Use the average of the two sensors. ○ Locate two sensors within 1 in. from the center of vertical formed surfaces at mid- height. This location may be adjusted, based on the isocurves developed for the model, with the approval of the Engineer. Use the average of the two sensors. ○ Use o ne sensor to record the ambient temperature. Place t his sensor at approximately 10 ft from the placement in a shaded area. ○ Provide up to four additional sensor pairs to be located at the discretion of the Engineer. ○ Use similar sensor distribution for placements greater than 500 cu yd. Note: For a 5°F or greater variation between sensors of a paired set, or erratic variations or outright failure of a sensor, notify the Engineer immediately upon discovery of the problem. At the time of the notification, provide the Engineer with a course of corrective action for approval. If the approved corrective action requires that the data from one sensor in a pair no longer be used, use the other functioning sensor solely for the peak and maximum differential temperature measurements. Provide p rocedures for achieving temperature restrictions including contingencies for severe weather events. Procedures may incorporate either active (cooling pipes) or passive control methods (insulation, tenting, venting, etc.) or both. Ensure that t he Temperature Control Plan identifies the expected duration of all temperature control measures for each model condition provided. If cooling pipes are proposed, submit a detailed description of the system describing the: • Layout and size of pipes • Anticipated coolant flow rate • Temperature of the raw coolant source • Pump size • Flow and recirculation control equipment
Part 600 — Concrete August 2025
SECTION 607 — MASS CONCRETE 600-41 • Instrumentation • Coolant temperature control procedure • Contingency plans Performance-Based Variable Temperature Differential Limit. After the Contractor has established that proper control can be maintained of the concrete mix properties, including curing temperatures, the Contractor ha s the option of submitting a plan to use performance-based criteria for a variable differential limit, based on the concrete strength as determined by the maturity at any given time. This will supersede the 35°F limit. Failure to maintain proper temperatu re control under this plan will result in reversion to the 35°F limit for subsequent placements until the Contractor demonstrates to the Engineer that causes for the loss of control have been identified and corrected. Temperature control will be considered to have failed if one of the following conditions occurs: • The differential exceeds the variable value by more than 3°F at any time during the first 40 hours after placement. • The differential exceeds the variable value by more than 5°F at any time after the first 40 hours after placement during temperature control. • The differential exceeds the variable value by 2°F or more for any period of eight hours or more at any time during temperature control. • Cracking of the placement determined to be the result of thermal issues will also be considered to be a failure of the temperature control and will result in reversion to the 35°F limit, and will trigger the provisions specified in Subsection 607.03.2.4. Plan Submission Requirements. Provide a written implementation plan that includes complete back-up data such as: • Listing of all assumptions used in the analysis • Published reference documents • Coefficient of the thermal expansion for the mix being placed • Tensile strength development versus maturity equations for the mix being placed • Elastic modulus versus maturity equations for the mix being placed • Example implementation of the method using a predicted thermal gradient analysis • Complete test data justifying the prediction equations for the proposed mixture Ensure that e ach placement also include s a specific plan with an assumed restraint factor, consideration of the placement geometry , and other factors that can affect the differential limit. The other factors include: • Anticipated concrete placement temperature • Ambient temperatures • Cooling water temperature (if active cooling is used) • Convection effects from wind and design elements of the temperature control plan
Part 600 — Concrete August 2025
600-42 SECTION 607 — MASS CONCRETE For acceptable demonstration of the submission of an implementation plan, the Contractor may use a mass concrete pour defined and conducted using the 35°F differential limit. Ensure that the gradients predicted in the thermal model for the performance-based temperature limit match the actual temperatures. Ensure that there are at least eleven temperature/maturity sensors. Locate sensors as follows:
1.At the location of the maximum temperature, place at least one sensor as defined in Subsection 607.03.1.1(b) (5th closed bullet, 1st open bullet).
2.Near the formed surface, place at least one sensor as defined in Subsection 607.03.1.1(b) (5th closed bullet, 2nd open bullet).
3.Near the top surface, place at least one sensor as defined in Subsection 607.03.1.1(b) (5th closed bullet, 3rd open bullet).
4.Place a minimum of two equally spaced between the location of the maximum temperature and top surface sensor in an approximate straight-line configuration.
5.Locate a minimum of two equally spaced between the location of the maximum temperature and formed surface sensor in an approximate straight-line configuration.
6.At the location of the minimum temperature, place at least one sensor as defined in Subsection 607.03.1.1(b) (5th closed bullet, 4th open bullet).
7.Locate a minimum of two equally spaced between the location of the maximum temperature and the location of the minimum temperature in an approximate straight-line configuration.
8.Use one sensor to record the ambient temperature remote from the placement, as defined in Subsection 607.03.1.1(b) (5th closed bullet, 5th open bullet). For Items 1, 2, 3, and 6, the sensors may be the same as those used for the actual temperature control of the placement as specified in Subsection 607.03.1.1(b). Although redundant sensors are not required, failure at any of the required locations without a backup will invalidate the results. Submit the performance-based temperature limit plan for approval before the first placement for which it is proposed to be used , stamped by a Rhode Island Registered Professional Engineer. If the plan is approved by the Engineer, this will become the standard sensor distribution for as long as th e plan is in effect . Use the plan to verify the accuracy of the performance -based temperature limit plan thermal model for each placement. Ensure that t he plan identifies the relationship between the maturity and the appropriate maximum acceptable temperature differential that will prevent cracking of the concrete. Present the relationship in tabular form, at intervals of 1°F for the first 40 hours after placement and 2°F for more than 40 hours after placement for a minimum of 14 days. Ensure that t he maturity value used to determine the appropriate differential at any given time is the lowest measured within the placement.
Part 600 — Concrete August 2025
SECTION 607 — MASS CONCRETE 600-43 Temperature Control Requirements. Temperature Control. Monitor m ass concrete temperature control by maturity loggers cast into the concrete, as described in Subsection 607.03.1.1. The use of low heat concrete mixtures, pre -cooling of the concrete, insulated curing blankets, insulated forms, cooling pipes, and other measures may be necessary to satisfy the temperature control requirements. Notify the Engineer immediately when temperature control limits are exceeded. Provide complete concrete temperature records for each placement including the secure files generated by the automated temperature sensors to the Engineer. Provide the Engineer with unobstructed access to temperature sensors at any time to verify compliance with temperature control criteria.
a.When forms are placed in water, waterproof the forms and insulation or otherwise protect against water absorption. Determine the required combined form and insulation R-Value through thermal analysis before placement using forecasted temperatures to meet the requirements to maintain the maximum peak and differential temperatures within the required limits.
b.Do not allow the temperature of the concrete at placement to exceed 65°F for cold weather placements nor 85°F for hot weather placements, unless active temperature control precautions are employed. Ensure that a ll active temperature control piping is non- metallic and filled with a non -shrink grout on the RIDOT Approved Products List upon completion of cooling operations. Ensure that t he temperature of the concrete at placement is within the acceptable range of values shown in the temperature control plan for the structural element.
c.Provide t emperature sensors that are maturity loggers as described in Subsection 607.02.2. Program the logger with the appropriate datum temperature.
d.Secure wiring for loggers that must be cast into the concrete to reinforcing or otherwise protected to prevent damage during concrete placement. The Engineer will approve the method of protection of the wires cast into the concrete. Clearly label wiring for loggers to identify the location within the form at both ends before being placed into the form. Locate ambient temperature sensors to be no closer than 10 ft from the mass concrete placement and be placed to provide an accurate measurement of the environmental condition. Encase w ire runs outside of concrete in conduit where necessary to prevent damage during subsequent construction operations.
e.Do not perform installation and verification checks for operation of any loggers unless the Engineer is present. Provide as-built versions of the temperature control plans showing the location of the loggers as identified by the unique serial numbers. Upon completion of monitoring, remove all visible wires from the concrete and any conduit penetrations filled with a non-shrink grout on the RIDOT Approved Products List.
f.Program each logger with notes identifying the placement and relative location within the placement. Secure l oggers into position , and verify function at least one day before concrete placement. Start temperature recording for each placement no less than two
Part 600 — Concrete August 2025
600-44 SECTION 607 — MASS CONCRETE hours before the initial concrete placement. Provide the Engineer safe access to the locations where readings will be taken to observe the initialization of the loggers and record relevant information. Include each logger serial number, location in the placement, and start time. Provide access as needed for subsequent readings.
g.Connect each logger for each placement to the wireless remote boxes. Provide as many wireless remote boxes as necessary to monitor all loggers simultaneously. Ensure that a sufficient quantity of wireless remote boxes are on hand to monitor all loggers for all placements being actively monitored at any given time during the Project. Maintain two spare remote boxes or 10 percent of the total on hand, whichever is larger, in operating condition at all times.
h.Protect the units from damage due to the environment and other factors to ensure that the remote boxes can retrieve and transmit data on a daily basis for the duration of the specified monitoring period for the concrete placement.
i.Provide at the Contractor ’s field office a wireless system radio base station compatible with the wireless remote boxes and provide the same model to the Engineer, as described in Subsection 607.02.2. Configure both wireless system radio base stations to access all active wireless remote boxes at any time without reconfiguration of any component. Upon setup of each wireless remote box and before placement of the concrete, test the remote operation of the system to verify that it works properly and that al l loggers connected to the wireless remote box can be accessed. The Contractor may, at its discretion, have a handheld reader for the loggers. However, do not use the handheld reader except to configure the loggers initially or to collect data if a problem with a wireless remote box occurs. Correct any problem within 24 hours. Upon connection/reconnection of a wireless remote box, test the operation as described above.
j.Download automated temperature measurements within one hour of the start of each calendar day when any element of temperature control is in place. Provide secure data files from each logger to the Engineer on a daily basis.
k.Do not allow t he peak concrete temperature at any location within the mass to exceed 155°F at any point in time. Failure to maintain a maximum peak concrete temperature less than or equal to 155°F will be cause for rejection of the concrete placement by the Engineer.
l.Do not allow the temperature differential to exceed 35°F or the value of the variable limit (if approved) at any point in time. Failure to control the maximum concrete temperature differential to less than or equal to the specified limit may be cause for rejection of the concrete placement by the Engineer. Exclude malfunctioning sensors from the differential calculation.
m.Protect the placement from exposure to precipitation to prevent cooling of the surface. Maintain the protection until temperature control is no longer required.
n.Allow the f orms to remain in place until the estimated strength of the concrete surface exceeds 2500 psi based on the lowest indicated maturity from the data loggers and until the differential between the mean center temperature and ambient temperature is less than 30°F and decreasing. Ensure that a mbient temperatures are rising at the time of
Part 600 — Concrete August 2025
SECTION 607 — MASS CONCRETE 600-45 form removal. Do not remove f orms before meeting all other requirements listed elsewhere in the Contract Documents.
o.Tenting, erecting windbreaks, covering with plastic, curing blankets, or other means may be necessary to protect the concrete surface from rapid cooling after form removal.
p.Protect c oncrete surfaces when the temperature differential between the peak temperature and ambient temperature is greater than 30°F.
q.Allow m ass concrete temperature control procedures to remain in effect until the temperature differential between the average peak temperature and the three-day mean ambient low temperature is less than 35°F.
r.Ensure that m ass concrete elements exposed to water reach at least the 28- day compressive strength as indicated by the approved maturity curve and ha s a peak temperature-to-water temperature differential less than 35°F before exposure.
s.Obtain written approval from the Engineer before removing temperature control. Curing. Meet the c uring requirements of Subsection 601.03.8 and Subsection 808.03.9, except as follows. Continuously moist cure m ass concrete placements for at least 14 days and until the 28 -day compressive strength as indicated by the approved maturity curve is achieved. Maintaining moisture on the top surface with forms in place shall be considered adequate moist curing. If strength and thermal control are achieved before 14 days, forms may be removed but continue moist curing. Ensure that w ater used for curing is fresh water and does not contain any salts or other components harmful to concrete. Control the temperature of water used for moist curing to within 30°F of the peak concrete temperature. Temperature Control Failure. Failure to meet the temperature control requirements may be cause for rejection of the concrete. Halt subsequent mass concrete placements immediately. Investigate the events that produced the failure, and submit a written report to the Engineer. Ensure that the investigation includes a thorough examination of the concrete placement and the reasons for non-compliance with these requirements, and document the width and extent of all visible cracks (if any) after cleaning the surface to fully expose them. Measure surface crack intensity after monitoring shows that the temperature, as measured by all sensors near the concrete surface, has dropped to within 10°F of the concrete temperature, as measured by the sensors at the center of thermal mass. Ensure that a licensed Rhode Island Professional Engineer conducts the investigation, and present crack repair options for approval by the Engineer according to Subsection 607.03.2.4. Remove all equipment and materials from the mass concrete element and clean the surface for the Engineer to verify the measurements of the crack intensity. Provide safe access for the Engineer’s inspection.
Part 600 — Concrete August 2025
600-46 SECTION 607 — MASS CONCRETE At the discretion of the Engineer, repair or removal and replacement of the rejected placement may be required of the Contractor. If required, perform the repair or removal and replacement of the rejected placement. At the discretion of the Engineer, submit a revised Mass Concrete General Temperature Control Plan to address any deficiencies identified by the investigation. Do not resume subsequent mass concrete placements without written approval by the Engineer. Crack Repairs. Repair thermal cracking by approved methods. Determination of when cracking is caused by thermal issues will be solely by the Engineer. Do not initiate repairs until the Engineer has approved the repair plan. For thermal cracking, suspend further work on members of similar size and configuration, submit a written explanation of the thermal cracking and proposed additional steps to eliminate future thermal cracking, and submit the proposed modifications to the Engineer for review. Do not resume concrete placement until the Engineer approves the proposed modifications.
607.04 Method of Measurement.
Mass Concrete will not be measured for payment.
607.05 Basis of Payment.
No separate payment will be made for this item. Compliance with the above requirements will be considered incidental to the placement of mass concrete. Costs for this item will be included in the bid prices of the appropriate items as listed in the Contract. Costs related to the development of Mass Concrete Temperature Control Plans will be considered incidental to the Project and will not be paid for separately. There shall be no claims for additional payment by the Contractor nor will there be an extension of the Project Completion Dates for any corrective actions required as a result of the rejected concrete and subsequent corrective measures to address any defi ciencies identified by the investigation.
Referenced in this section
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Source: Standard Specifications for Road and Bridge Construction (Blue Book), 2022 (Aug 2025 compilation) Edition. Pages 314–325 of 951. View official source ↗