The work shall consist of producing and placing concrete of grade M15 and higher by weigh batching in accordance with MoRTH Specifications, IRC:112, approved drawings, and contract specifications.
After completion of site preparation, alignment of the structure shall be marked on the ground using lime and string. Structural points such as abutment walls and wing walls shall be pegged accurately. Temporary Bench Marks (TBM) shall be established nearby for level reference and protected throughout construction activities.
Cement conforming to IS:269 shall be used after ensuring the required design strength. Manufacturer Test Certificates (MTC) shall be submitted to the AE for every consignment. Independent testing shall also be conducted at approved laboratories.
Coarse aggregates shall be obtained from approved quarries and shall consist of clean, hard, durable crushed stone conforming to Table 1700-7 of MoRTH Specifications / IS 383.
Fine aggregates shall be clean, durable, and free from deleterious materials. Gradation shall conform to Table 1000-2 of MoRTH Specifications / IS 383.
Water used for mixing and curing shall conform to IS 456 and Section 1010 of MoRTH Specifications. Water shall be free from harmful substances. Use of seawater shall not be permitted.
Reinforcement steel shall conform to Section 1009.3 of MoRTH Specifications and IS 1786. TMT Fe-500 grade bars shall be used as per approved drawings.
Bar Bending Schedule (BBS) shall be prepared and submitted for approval before commencement of work. It shall include shape, number, cutting length, and weight of bars including auxiliary reinforcement.
All materials shall be approved by the AE before use in construction.
Reinforcement shall be placed as per approved drawings and inspected by the AE before concreting.
Concrete shall be produced using approved design mix by weigh batching. Measuring equipment shall be maintained in proper condition and calibrated periodically.
Water-cement ratio shall be maintained considering moisture content of aggregates and weather conditions.
Trial mixes for all grades of concrete shall be carried out at the site laboratory before commencement of work using approved materials. Additional trial mixes shall be conducted whenever there is a change in source or proportion of materials.
Concrete shall be transported using transit mixers or concrete pumps. The delivery pipeline shall have minimum bends.
Formwork shall conform to Section 1500 of MoRTH Specifications and IRC:87.
Construction joints shall be kept to a minimum and provided as per drawings. Laitance shall be removed and the concrete surface roughened before placing fresh concrete.
Water curing shall be carried out using approved water conforming to MoRTH Specifications.
Finishing shall be carried out as per Clause 1713 of Section 1700 of MoRTH Specifications to achieve smooth and durable concrete surfaces.
