Apparent ready mixed concrete shortages are caused by:
Depending on the workability, the ready mixed concrete might be usable for up to 3 hours.
International Standards specify that ready mixed concrete must be discharged from the transit mixer truck within 2 hours of the time of loading. It is also mandatory to make arrangements at site to ensure that full load of ready mixed concrete is discharged within 30 minutes of arrival on site.
The transit mixers are about 9 m long, 2.5 m wide and 3.8 m high
A truck weighs 10 tons when it is empty and 25 tons when it is fully loaded with ready mixed concrete.
Pumps are designed to facilitate pumping of ready mixed concrete through the pipeline under high hydraulic pressure. When ready mixed concrete is pushed through the pipeline, it is separated from pipe line wall by a lubricating layer of cement, water and fine aggregates. Ready mixed concrete should have enough cohesiveness and workability for the mix to move easily through pipeline, bends, reducers and hoses.
Fly ash is a byproduct of coal combustion. Most commonly the material is produced by coal fired electrical generating facilities. Fly ash is a cementatious material, meaning it has certain properties that cause it to harden upon exposure to water. Typically, fly ash does not develop much compressive strength on its own. However, in the presence of Portland cement, fly ash can develop strength characteristics very similar to cement. The fly ash reacts with a chemical by-product of the cement hydration reaction called calcium hydroxide -CaOH-. CaOH can cause deleterious effects in concrete such as increased porosity and efflorescence -the formation of calcium carbonate crystals on the concrete or mortar surface-. Because fly ash reacts with the calcium hydroxide to form more calcium silicate hydrate -the binder derivative of cement- fly ash actually adds strength to the concrete and helps to remove an agent that may be harmful. Fly ash is also particularly beneficial for use in hot weather as it tends to slow the generation of heat in the concrete.
Yes. CEMEX Concrete is produced to British & European Standards
Concrete surfaces can flake or spall for one or more of the following reasons: