安全高效应用泵送剂的相关问题（Safety and efficient application of pumping agent）.docVIP

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安全高效应用泵送剂的相关问题（Safety and efficient application of pumping agent）.doc

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安全高效应用泵送剂的相关问题（Safety and efficient application of pumping agent）

安全高效应用泵送剂的相关问题（Safety and efficient application of pumping agent） Since the establishment of the first commodity concrete mixing station in Changzhou building materials supply company in 1979, the development of commodity concrete has been going through 31 years. In the course of the past 31 years, especially commendable is that in recent 10 years, the total amount of commercial concrete in China exceeded 700 million m3 in 2010, and the proportion of commercial concrete in total output of concrete was over 30%. The development of commercial concrete has greatly promoted the centralized production and supply of concrete pumping construction technology, and ensure the quality of the project, improve the cement bulk rate, is an important part of building energy saving. Commercial concrete transported to the site after the site, usually through the pressure pumping method, pouring into the structure of the mold. In the concrete pump is driven along the pipeline transportation and casting, which in addition to meet the strength, durability and economy indexes such as the design requirements, must also meet liquidity in the process of transportation and maintain, transportation technology and pipeline special requirements on the mixing properties, also known as the pump. But the concrete pump and the fluidity have the connection, but also has the obvious difference. In order to pump smoothly, the concrete mixture should have good liquidity first, such as general requirements, slump must be greater than l2cm, but the fluidity of concrete is not necessarily good. Excess liquidity not only on the pump is not good, but also lead to bleeding and segregation and other quality problems, and even the loss of concrete pump, pump plugging accident occurred. Therefore, in the selection of raw materials and mix design, careful consideration should be given to multiple factors in order to prepare flowability, retention requirements and concrete mixtures with good pumping performance.