Cracks often occur in the use of cement pipes, so do you know the causes and solutions of cracks in cement pipes? Let's take a closer look with Xiaoxin Xiaobian!
The causes of cracks on the concrete surface Most of the cracks on the concrete surface are caused by shrinkage. They can be divided into two categories: First, the moisture on the surface of the concrete that has just been poured is evaporated and dried. It is high and the relative humidity in the air is small, so its surface will evaporate and dry, but its interior is still a plastic body, which will cause cracks. The other is caused by the internal and external temperature difference caused by the hydration heat when the concrete is hardened. For the deeper concrete, during the pouring of the upper concrete, it will continue to settle due to its own weight. Then when the concrete begins to set but does not set before it suffers from steel bars or formwork bolts, the settlement will be blocked and cracks will occur.
Treatment of concrete surface cracks First, we must effectively control the internal heating rate of concrete. We can mix the appropriate amount of fly ash in the production of concrete to slow down the rate of heat release from hydration. Second, we can control the temperature of raw materials. Cooling pipes are used inside the concrete structure to circulate water to release the heat of hydration. When cracks have appeared in the concrete, we usually use cement paste or low viscosity polymers to seal them to prevent water intrusion; if the cracks are deep or wide, we use pressure grouting technology to repair them.