How much concrete mixing time are specified in the specification?
Not less than 120 seconds, no more than 130 seconds, with the concrete mixing time, the strength of concrete will be higher, which is the result of a large number of tests.
Used only consider whether forced mixer, forced mixer in the absence of other special admixtures, stirring for 90 seconds, mixed with other additives such as antifreeze, air entraining agent, silicon powder, fiber, stirring time increased to 120 seconds, the longest no more than 180 seconds
The shortest time "GBl4902-2003" 7.5.2 ready mixed concrete mixing concrete shall comply with the following provisions: a) when used to transport concrete mixing truck, the shortest time mixing shall be in accordance with the specification of equipment, and each disc mixing time (from all the material cast date) shall not be less than 30s, in the preparation of more than C50 the strength grade of concrete or the use of air entraining agent, expansive agent, water proofing agent should be a corresponding increase in the mixing time. B) when using the dump truck to transport concrete, should be appropriately extended mixing time.
