Standard curing conditions can make concrete harden normally, because concrete will gradually set and harden under the comprehensive situation of cement and water after pouring, and hydration needs appropriate temperature and humidity. If the temperature and humidity are not up to standard, concrete will crack and break. Concrete refers to the general name of engineering composite materials in which aggregates are bonded into a whole by cementing materials, and general concrete refers to cement as cementing materials.
Sand and stone are used as aggregate and mixed with water (including admixture and admixture) according to a certain proportion. Cement concrete after mixing is also called ordinary concrete, which is widely used in civil engineering and is also one of the most important civil engineering materials in modern times. Concrete is used more and more because of its rich raw materials, low price and simple production technology.
An engineering material
In addition, concrete has the characteristics of high compressive strength, good durability and wide range of strength grades, which makes it widely applicable. It is not only used in various civil engineering, shipbuilding, machinery industry, marine development, geothermal engineering, etc. , is also an important material. Concrete curing time must be sufficient, but enough is enough, especially during water curing, otherwise it may lead to great shrinkage and cracking of concrete.
Under normal circumstances, after the ordinary concrete enters the curing period, the water curing time should be at least 7 days, but if there are special impermeability requirements, then the water curing time should be at least 14 days. There are many forms of concrete curing, such as steam curing, natural curing, full water curing, laying curing film and so on.