Analysis of multiple collapse of concrete

Concrete collapse is a complex and multifaceted problem, which is not caused by a single reason, but the result of many factors. This is called "multiple collapse of concrete".

First of all, the slump loss of the concrete output machine, also known as instantaneous loss, refers to the slump reduction that occurs immediately after the concrete is mixed out of the station. This loss is mainly attributed to the nature and mix ratio of the concrete raw materials, as well as the efficiency of the mixing process.

Secondly, the loss of fluidity occurs during the mixing process due to the internal friction and viscous resistance of the mix. The particle size distribution of cement, the shape and size of aggregate, and the type and amount of admixtures may affect the fluidity of concrete.

Thirdly, pumping loss refers to the loss of slump of concrete in the pumping process. This is mainly caused by the pressure and friction during the pumping process. In addition, the efficiency of the equipment, the length and layout of the pipe also have an impact on the pumping loss.

Then, the loss of air content is larger after the time, which means that the air content in the concrete is significantly reduced after a period of time. This may be caused by the hydration reaction of cement, the reduction of the efficiency of admixtures, the change of ambient temperature and other factors.

Finally, the problem of difficult site construction and low strength may be related to factors such as the mix ratio of concrete, the type of cement used, and the quality and grading of aggregates. In addition, construction technology and curing conditions will also have an impact on the strength development of concrete.

In general, "concrete multiple collapse" is a comprehensive problem, involving concrete preparation, transportation, construction and other links. To solve this problem, it is necessary to comprehensively consider and improve from many aspects such as raw material control, mix ratio design and construction process optimization.