IS 9844 covers RMC from ordering through delivery and acceptance. It specifies batching plant requirements, mixing time, transit time limits (concrete must be placed within 2 hours of adding water), and site acceptance tests. Critical for quality control of RMC in modern construction.
Code of practice for production, delivery, and acceptance of ready-mixed concrete (RMC) from batching plants.
Key Values
Max transit time2 hours from water addition
Max drum revolutions300 total
Batching tolerance (cement)±2%
Practical Notes
! Concrete must be discharged within 2 hours of water addition — reject any truck arriving late.
! Always test slump at site before accepting — specified slump ±25mm tolerance per IS 9844.
! Get the batch ticket from every truck — it shows mix proportions, batch time, and water added.
! RMC plants must be certified by RMCMA or equivalent quality system.