This standard specifies the requirements for production, quality control, and supply of ready-mixed concrete (RMC). It covers constituent materials, ordering information, manufacturing tolerances, transport, delivery, sampling, and conformity criteria to ensure quality for construction projects.
Covers the requirements for ready-mixed concrete (RMC) delivered to the purchaser at the site in a plastic state.
Quick Reference Values
Maximum time from batching to discharge90 minutes (as per referenced IS 456, unless otherwise agreed)
Tolerance on slump (50-100 mm range)± 25 mm
Tolerance on cementitious material content± 3 % of specified mass
Tolerance on total water content± 3 % of specified mass
Minimum sampling frequency for continuous production1 sample per 50 m³
Practical Notes
The purchaser must clearly specify either a 'prescribed mix' (providing proportions) or a 'designed mix' (providing performance requirements like strength and workability). 'Designed mix' is most common.
Always check the delivery ticket (challan) on-site for details like grade, quantity, time of batching, and admixture content before accepting the concrete.
Unauthorized addition of water to the transit mixer at the site is strictly prohibited as it compromises the strength and durability of the concrete.