Having been engaged in the concrete industry for many years, bleeding and segregation phenomena are often encountered. The cyclic changes caused by the constant changes in cement and admixtures are not accidental, but exist. Essential connection. It occurs due to energy conservation, emission reduction and cost reduction in cement plants in recent years, which have resulted in changes in ingredients, production processes, cement chemical components and mineral composition, cement fineness and mixing materials, etc.
Changes in cement itself will inevitably lead to changes in the adaptability of cement and admixtures, breaking the original adaptability balance system. When cement cannot be changed, admixtures are usually relied on as important performance-adjusting materials for concrete. However, the raw materials themselves are constantly changing with market prices and supply issues. In particular, the cost of large monomers of admixtures is increasing. Production companies are New materials are constantly being used to reduce their costs. These materials may have certain improvements in the performance of concrete, but the application of each new material requires continuous verification during the process, and there are variations and uncertainties. In addition, materials such as sand and gravel, fly ash, and slag powder are also constantly changing. The superimposed effects of unreasonable design and construction have aggravated various abnormal phenomena in concrete and increased the difficulty of quality control. Based on years of experience, four measures are taken to prevent and control bleeding and segregation of concrete. </p
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