Need to be Specified for Ready Mix Concrete

Need to be Specified for Ready Mix Concrete

The following need to be specified very clearly:

·     Characteristic strength or grade (N/mm2)

·     Target workability or slump in mm required at site

·     Exposure conditions for durability requirements

·     Maximum water to cement ratio

·     Minimum cement content

·     Maximum aggregate size

·     Type of cement

·     Mineral admixture and its proportion (Kg/m3)

·     Maximum aggregate size

·     Rate of gain of strength (for formwork removal or prestressing etc.)

·     Maximum temperature of concrete at the time of placing (in extreme climatic conditions or incase of massive concrete pours)

·     Type of surface finish desired

·     Method of placing

·     Rate of supply desired to match the placing and compaction speed planned at site.

·     Quantity of concrete required.

·     Lift and lead of concrete transportation and placement at site.

·     Frequency of concrete testing

·     Details of materials and their required tests.

·     Permeability tests required (if any)

·     Placing of concrete in formwork to be under scope of RMC supplier (if required)

·     Permissible wastage

·     Mode of measurement.