This standard specifies the requirements for the design, construction, and performance of transit concrete mixers used for producing and transporting ready-mixed concrete. It covers material specifications, drum capacity, blade configuration, water system, power unit, and the performance tests required to ensure uniform mixing of concrete.
Specifies requirements for transit mixers used for transporting and mixing concrete.
Quick Reference Values
Minimum drum shell thickness5 mm
Mixing speed range4 to 18 rev/min
Agitating speednot less than 2 rev/min
Minimum water tank capacity455 litres
Water pump delivery ratenot less than 135 litres/min
Minimum revolutions for mixing50 revolutions
Practical Notes
Ensure the water meter is calibrated regularly as per Clause 5.2.2 to maintain an accurate water-cement ratio on site.
Regularly inspect blade wear against the requirements in Clause 4.1.2, as worn-out blades significantly reduce mixing efficiency and concrete uniformity.
Verify the mixer's performance certificate to ensure it meets the uniformity tests outlined in Table 2, especially for critical projects.