Article 1 — Description
Provide weighing and measuring equipment for materials measured or proportioned by weight or volume.
Article 2 — Equipment
Provide certified scales, scale installations, and measuring equipment meeting the requirements of NIST Handbook 44, except that the required accuracy must be 0.4% of the material being weighed or measured. Provide personnel, facilities, and equipment for checking the scales as approved. Check all weighing and measuring equipment after each move and at least once every 6 mo. or when requested. Calibrate truck scales using weights certified by the Texas Department of Agriculture or an equivalent agency as approved. Provide a written calibration report from a scale mechanic for truck scale calibrations. Cease plant operations during the checking operation. Do not use inaccurate or inadequate scales. Bring performance errors as close to zero as practicable when adjusting equipment . Furnish enough certified weights to check the accuracy and sensitivity of the scales. Insulate scales against shock, vibrations, or movement of other operating equipment. Provide an automated ticket printout for each truckload of material daily where payment is determined by weight. Each loading ticket must show the ticket number, truck number, gross weight, tare weight, and net weight. At the Contractor’s option, an electronic ticket delivery system (e -ticketing) may be used instead of printed tickets. The use of e- ticketing will require written approval of the Engineer. At minimum, the approved system must: provide real -time e -tickets in conformance with the applicable bid items , automatically generate e- tickets using software and hardware fully integrated with the automated scale system used to weigh the material and designed such that data input cannot be altered by the Contractor or the Engineer, provide the Engineer access to the e- ticketing data in real time using a web- based or app- based system compatible with iOS, provide offline capabilities to prevent data loss if power or connectivity is lost; and require the Contractor and the Engineer to accept or reject the e- ticket and provide the ability to record the information required by the applicable bid items, as well as any comments. Record the time of the approval or rejection and include it in the summary spreadsheet described below. Provide each party the capability to edit their respective actions and any entered information. The Contractor may discontinue use of the e-ticket system and provide printed tickets as needed to meet the requirements of the applicable bid items. Provide a summary spreadsheet that lists separately the ticket number, truck number, gross weight, tare weight, net weight, overload weight, and payment weight amounts as shown in Table 1 if required on the plans for materials paid by the ton. Provide this spreadsheet: for each lot when materials are paid for in increments of sublots or lots, and daily for other materials. Provide the totals for net weight and overload amounts to be deducted for all summary sheets within 2 days of delivery of materials. Include the overload deduction in the total amount reported for payment. Submissions are subject to verification. 801 Table 1 Example Spreadsheet Ticket No. Truck No. Gross Wt. Tare Wt. Net Wt. Overload Wt. Payment Wt. Totals Totals Totals Furnish leak -free weighing containers large enough to hold a complete batch of the material being measured.
2.1 Truck Scales. Furnish platform truck scales capable of weighing the entire truck or truck –trailer combination
in a single draft.
2.2 Aggregate Batching Scales. Equip scales used for weighing aggregate with a quick adjustment at zero that
provides for any change in tare. Provide a visual means that indicates the required weight for each aggregate.
2.3 Suspended Hopper . Provide a means for the addition or the removal of small amounts of material to adjust
the quantity to the exact weight per batch. Ensure the scale equipment is level.
2.4 Belt Scales. Use belt scales for proportioning aggregate that are accurate to within 1.0% based on the average of three test runs, where no individual test run exceeds 2.0% when checked, in accordance with
Tex-920-K .
2.5 Asphalt Material Meter . Provide an asphalt material meter with an automatic digital display of the volume or
weight of asphalt material. Verify the accuracy of the meter in accordance with Tex -921-K . Ensure the accuracy of the meter is within 0.4% when using the asphalt meter for payment purposes. Ensure the accuracy of the meter is within 1.0% when used to measure component materials only and not for payment.
2.6 Liquid Asphalt Additive Meters . Provide a means to check the accuracy of meter output for asphalt primer,
fluxing material, and liquid additives. Furnish a meter that reads in increments of 0.1 gal. or less. Verify accuracy of the meter in accordance with Tex -923-K . Ensure the accuracy of the meter within 5.0%.
2.7 Particulate Solid and Slurry Additive Meters. Provide a means to check the accuracy of meter output for particulate solids (e.g., hydrated lime or mineral filler) and slurries ( e.g., hydrated lime slurry). Ensure the
accuracy of the meter within 5.0%.
Article 3 — Measurement and Payment
The work performed, materials furnished, equipment, labor, tools, and incidentals will not be measured or paid for directly but will be subsidiary to pertinent Items.