be used to calculate the number of counts per 94 lb 730 of cement and the time required to discharge 94 lb of cement.
Counts per 94 lb of cement = 94 ÷ A B
Time in seconds per 94 lb of cement = 94 ÷ A C where: A = Total weight of cement in pounds for three trials B = Total number of counts on the cement meter for three trials C = Total time in seconds for three trials. 740
weight in pounds of the discharged water shall be divided by 8.33 to determine the number of gallons. This procedure shall be repeated with the flow meter adjusted to 3 gal. per minute. 3. Aggregate Bin Gates The aggregate gate openings shall be adjusted to provide the required amount of 750 aggregate to produce a cubic yard of the designated mix. The gate settings for the fine aggregate and coarse aggregate shall be de termined separately. Each aggregate shall be verified by stopping the cement discharge and collecting the aggregate discharged in a container. Calculations for all aggregates shall be based on SSD weights taken from the mix design. The calculations shall be adjusted for the tested moisture content. The final gate setting for each aggregate shall dispense material within a tolerance of ±2% of the target weights after adjustment for measured moisture content. 760
The latex strainer shall be unobstructe d. The latex throttling valve shall be adjusted to deliver the required amount of latex emulsion admixture for each 94 lb of cement. With the unit operating at the required revolutions per minute for the calculated time in seconds per 94 lb of cement, the latex shall be discharged into a container. The weight of the latex shall be determined and, when necessary, the valve shall be adjusted such that the amount of latex discharged is within 1/2 lb of the amount required for each 94 lb of cement. One ve rification shall be performed to check the accuracy of the valve setting. 770
This equipment shall be calibrated in accordance with the manufacturer’s instructions for the specific materials and quantities involved. 722.13 789 722.14 Patching an Existing Bridge Deck Overlay
Materials shall be in accordance with 722.03. (b) Storage and Handling of Materials 780 Storage and handling of materials sh all be in accordance with 722.04.
Proportioning shall be in accordance with 722.05. (d) Preparation of the Bridge Floor Preparation of the bridge floor shall be in accordance with the applicable provisions of 722.06.
Patching shall be in accordance with 722. 07 except as modified herein. Areas repaired by full depth patching shall not be open to traffic until the test beams indicate a minimum modulus of rupture of 550 psi.
Mixing shall be in accordance with the applicable provisions of 722.09. (g) Placing and Finishing Placing and finishing shall be in accordance with the applicable provisions of
722.10. Machine finishing shall be required when directed. 800
The surface texturing shall match the pattern of the adjacent overlay and shall be in accordance with the following: Immediately after the finishing is co mplete and before the surface film has formed, the surface of the overlay patch shall be textured by grooving in the same direction as the existing overlay. The grooves may be formed by mechanized equipment using a vibrating beam roller, a series of discs, or other approved device. Manual tools such as fluted floats, spring steel tined rakes, or finned floats with a 810 single row of fins may be used. The grooves shall be relatively uniform, smooth, and shall be formed without tearing the surface or bringing coarse aggregate to the top. The grooves shall be in accordance with 504.03. The grooves shall be terminated the same distance from the vertical faces of railings as the existing grooves in the adjacent existing overlay surface. All areas of hardened grooved overlay patching which do not conform to these requirements, due to either a deficiency in the grooving or a rough open textured surface, shall be corrected with no additional payment. Corrections shall be made by cutting grooves in the hardened overlay with an approved cutting machine or by 820 722.14 790 sealing with an approved mixture and retexturing to a satisfactory finish as directed.
Curing shall be in accordance with 722. 12 when patching has been performed using overlay concrete. Patches that have b een constructed using bridge deck patching concrete shall be wet cured until test beams indicate a minimum modulus of rupture of 550 psi. Patches that have been constructed using rapid setting patch materials shall be cured in accordance with the manufacturer’s recommendations.
Calibration shall be in accordance with 722.13. 722.15 Method of Measurement Removal of the existing overlay and the additional depth into the existing deck surface will be measured by the square yard of deck area regardless of the number of passes with the milling machine. Removal of the existing concrete deck surface will be measured by the square yard for the initial depth shown on the plans. Additional surface removal required below the initial depth will be measured by the square yard for each required 1/4 in. 840 depth. The areas of the bridge floor which are shown on the plans to be removed, except for undefined full depth patching areas, will not be measured for payment. Hydrodemolition of the bridge deck will be measured by the square yard. Additional surface preparation around reinforcing bars will be measured by the linear foot of exposed reinforcing bar. Reinforcing bar repair will not be measured for payment. When hydrodemolition is not shown on the plans, partial depth patching will be measured by the square foot. 850
The measurement of bridge deck patching concrete for partial depth cavities created by handchipping or hydrodemolition will be based on a theoretical quantity determined by multiplying the area of the appropriate partial depth cavities by an assumed average depth of 2 in. and converting the resulting volume into cubic yards. Overlay material used in a partial depth cavity will be measured by the cubic yard. The quantities of patching material used in a partial depth cavity will be included in the measurement of additional bridge deck overlay. The overlay and bridge deck patching concrete used to fill cavities as part of 860 patching an existing bridge deck overlay will not be measured for payment. Overlay material used to fill surface irregularities and partial depth cavities will be calculated by the cubic yard and will be included for payment for Bridge Deck Overlay Budget. 722.15 791 Full depth patching will be measured by the square foot. The patching material used in full depth patching will not be measured for payment.
Bridge deck overlay will be measured by the square yard for the specified 870 thickness. Where there is no specified thickness shown on the plans, the specified thickness shall be 2 in. Overlay dams and patching an existing overlay will be measured by the square foot. Longitudinal grooving will be measured by the square yard. No deduction in measurement will be made for areas where grooving is terminated or not required. Epoxy resin adhesive and bond coat will not be measured for payment. Blasting, 880 cleaning, finishing, texturing other than the longitudinal grooving, and curing will not be measured for payment. 722.16 Basis of Payment Removal of the existing overlay and the additional depth into the existing deck surface will be paid for at the contract unit price per square yard of bridge deck, remove existing concrete overlay. Milling of the initial depth of surface will be paid for at the contract unit price per square yard of bridge deck, remove existing concrete surface. Additional surface 890 removal below the initial depth will be paid for at the contract unit price per square yard for bridge deck, remove existing concrete surface for each required 1/4 in. depth. Hydrodemolition of the bridge deck will be paid for at the contract unit price per square yard. When hydrodemolition is shown on the plans, additional surface preparation will be paid for at the established price shown per linear foot for bridge deck overlay, additional surface prep.
When hydrodemolition is not shown on the plans, partia l depth patching will be paid for at the contract unit price per square foot for bridge deck patching, partial 900 depth. When partial depth cavities are subsequently directed to be made full depth, additional payment will be made at 80% of the contract unit price per square foot for bridge deck patching, full depth. Full depth patching will be paid for at the contract unit price per square foot for bridge deck patching, full depth.
Bridge deck overlay will be paid for at the contract unit price per square yard, for 910 the type of overlay material specified. 722.16 792 Patching an existing bridge deck overlay will be paid for at the contract unit price per square foot for bridge deck overlay patching.
Overlay dam will be paid for at the contract unit price per square foot, complete in place. Longitudinal grooving will be paid for at the contract unit price per square yard. 920 The Department will include the pay ite m Bridge Deck Overlay Budget, with an established dollar amount in the proposal to pay for additional surface preparation completed after hydrodemolition and bridge deck overlay additional quantity used to fill irregularities and partial depth cavities. The Bridge Deck Overlay Budget amount shown in the proposal is included in the to tal bid amount. The Depa rtment will pay for the additional quantity installed to fill irregularities and partial depth cavities as directed by the Engineer. Where the material exceeds the planned overlay quantity, payment will be at the invoice cost of the additional bridge deck overlay quantity installed. An amount equal to 10% of the in voice cost will also be paid for additional disposal and all other related costs in conn ection with the additional quantity installed. 930 No additional markup shall be applied for additional bridge deck overlay quantity installed. This amount will be paid using the Bridge Deck Overlay Budget pay item.
Payment will be made under: Pay Item Pay Unit Symbol Bridge Deck Overlay Budget .................................................... DOL Bridge Deck Overlay, Latex Modified ...................................... SYS Bridge Deck Overlay, LMC-VE ................................................ SYS 940 Bridge Deck Overlay, Patching ................................................. SFT Bridge Deck Overlay, Silica Fume Modified ............................ SYS Bridge Deck, Remove Existing Concrete Overlay .................... SYS Bridge Deck, Remove Existing Concrete Surface ..................... SYS Bridge Deck Patching, Full Depth ............................................. SFT Bridge Deck Patching, Partial Depth ......................................... SFT Hydrodemolition ....................................................................... SYS Longitudinal Grooving .............................................................. SYS Overlay Dam ............................................................................. SFT 950 Item shown with an established price will be paid at the price shown. Pay Item Pay Unit Established Symbol Price
Bridge Deck Overlay, Addi tional Surface Prep...... LFT ............... $20 The cost of overlay removal by handchipping in areas adjacent to the curb or 722.16 793 otherwise inaccessible to the power-operated mechanical milling machine shall be included in the cost of bridge deck overlay, remove existing overlay. The cost of 960 disposing of overlay removal residue, includi ng water, dust, concrete and incidentals shall be included in the cost of bridge deck, remove existing overlay. The cost of deck surface preparation by ha ndchipping in areas ad jacent to the curb or otherwise inaccessible to the power-operated mechanical milling machine shall be included in the cost of bridge deck, remove existing concrete surface or bridge deck, remove existing overlay. The removal of surface milling residue, including water, dust, concrete, and incidentals shall be included in the cost of bridge deck, remove existing concrete surface or bridge deck, remove existing overlay. 970 The cost of the wastewater control and disposal plan, wastewater containment, testing, storing, transporting and disposal, and any incidentals related to the carrying out of the plan shall be included in the co st of hydrodemolition. If the wastewater is found to have a pH of 12.5 or higher and thereby classified as hazardous, the additional costs associated with this classification will be paid for in accordance with 109.05. The initial equipment calibration, any re-calibration, equipment shielding, handchipping curb areas, handchipping unsound concrete, cleaning of debris and slurry, compressed air cleaning, water blasting, and sandblasting shall be included in the cost of hydrodemolition. 980 When hydrodemolition is shown on the plans, the cost of removal of unsound concrete shall be included in the cost of hydrodemolition. Preparation of cavity surfaces, furnishing and applying bond coat or epoxy resin adhesive as required in handchipped locations, furnishing and pl acing patching material, and necessary incidentals shall be included in the cost of bridge deck overlay for the type of overlay material specified. Additional concrete re moval required around exposed bars shall be included in the cost of additional surface preparation. When hydrodemolition is not shown on the plans, the cost of removal of unsound 990 concrete, preparation of cavity surfaces, furnishing and applying bond coat or epoxy resin adhesive as required, furnishing and placing patchi ng material, and necessary incidentals shall be included in the cost of bridge deck patching, full depth, or bridge deck patching, partial depth. The cost of patching material used for full depth patching shall be included in the cost of bridge deck patching, full depth. The cost of texturing patched areas will not be paid for separately but shall be included in the cost of the patch. The cost of furnishing and placing patching material in partial depth cavities and 1000 necessary incidentals shall be included in the cost of bridge deck overlay, additional. When the project does not include the installation of a new bridge deck overlay, the cost of partial depth patching below the bottom of the overlay shall be included in 722.16 794 the cost of bridge deck overlay, patching. The cost of patching and overlay materials used to fill the cavities shall be included in the cost of bridge deck overlay, patching.
The cost of removing existing concrete, furnishing, hauling, and placing all materials including the epoxy, preparing the surface, and all necessary incidentals shall be included in the cost of overlay dam. 1010 The cost of deck cleaning shall be included in the cost of other pay items.
The cost of removing and disposing of the slurry created during the longitudinal grooving shall be included in the cost of longitudinal grooving. Coring of the bridge deck, patching core holes, and all corrective measures required in accordance with 722.12 shall be performed at no additional cost to the Department. 1020