商品混凝土的质量控制措施（Quality control measures of commercial concrete）.docVIP

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商品混凝土的质量控制措施（Quality control measures of commercial concrete）.doc

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商品混凝土的质量控制措施（Quality control measures of commercial concrete） Quality control measures of commercial concrete The use of commercial concrete can speed up the progress of construction, reduce environmental pollution, improve the urban environment, improve the quality of the project and save material costs, etc. these advantages attract peoples attention. Therefore, in urban engineering construction. Commercial concrete has been widely used. However, the quality problem and quality accident due to the use of commodity concrete in the construction of the phenomenon are many, especially for large volume concrete, high strength concrete and self compacting concrete, the quality control problem is particularly prominent. 1, the selection of high-quality raw materials The concrete is composed of cement, sand, stone, admixture, admixture and water. The quality and stability of these materials directly affect the quality and performance of concrete. Careful screening of raw materials is the basis for ensuring the quality of commercial concrete. 1.1 cement Cement is the main cementitious material in concrete, which has great influence on the quality of concrete. The emphasis of cement quality control is stability control. In order to ensure the quality of concrete, it can be controlled from the following aspects: (1) using rotary kiln cement. Generally speaking, the rotary kiln cement production scale is larger, the cement stability. The quality is stable, the strength of the batch and batch and the fluctuation of mineral composition are small, which is beneficial to the quality control of concrete. (2) priority shall be given to Portland cement and ordinary portland cement with good frost resistance, strong sulfate resistance, low standard consistency, strength grade no less than 42.5, early strength. (3) the cement strength surplus amount, intensity standard deviation, the initial and final setting time, the adaptability and the technical index of the slump loss rate of the