SECTION 553 – PNEUMATICALLY APPLIED MORTAR
553.01 Description
This Section describes the requireme nts for removing and restoring deteriorated concrete with pneumatically applied mortar.
553.02 Materials
553.02.01 Materials
Provide materials as specified: Fine Aggregate ................................ ................................ ................................ ................................ ........ 901.06.02 Cement ................................ ................................ ................................ ................................ ......................... 903.01 Curing Materials ................................ ................................ ................................ ................................ ........... 903.10 Reinforcement Steel ................................ ................................ ................................ ................................ ...... 905.01 Water ................................ ................................ ................................ ................................ ............................ 919.08
553.02.02 Equipment
Submit technical data sheets for the proposed pneumatic hammers to the RE for approval.
553.03 Construction
553.03.01 Pneumatically Applied Mortar
A.Limits of Repair. The RE will examine the structure to verify the repair limits shown on the Plans. Submit written notice to the RE at least 15 days before the work site is available for examination. The RE may increase or decrease the limits of repair based on the examination. The RE will schedule surveys during daylight hours unless the working time is restricted in the Contract.
B.Preparing and Cleaning. Remove deteriorated concrete to a sound surface and at least 1 inch beyond the first mat of reinforcement steel. Do not use pneumatic hammers heavier than nominal 30 pound class (33 pounds maximum) to remove the concrete. For abutment, pier seat, or column repairs, do not extend removal under the bearing seats without approval of the RE. Clean and replace reinforcement steel as specified in 551.03.01.C. Chip concrete encasement cavities so their sides are perpendicular to the exposed surface for at least 1/2 inch in depth. Remove loose particles from the areas receiving mortar by flushing or scouring with compressed air jets
C.Test Panels. Construct test panels using the equipment, materials, and mix proportions proposed for each type of repair on the Project. Construct test panels that are at least 30 × 30 × 3 inches for each mix, for each type of repair, and for each shooting position to be encountered on the job, including the overhead position. Construct test panels to the same thickness as the repair, but not less than 3 inches thick. Apply the mortar for the test panels, against similar support conditions to simulate actual field conditions for concrete repairs. The ME will mark the test panels at the time of application. Field cure panels in the same manner as the work for 7 days. Deliver the test panels to the ME after the field cure is complete.
Referenced in this section
Pneumatically Applied Mortar in other states
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Source: Standard Specifications for Road and Bridge Construction, 2019 (rev. 2022-12-21) Edition. Pages 304–304 of 651. View official source ↗