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1 砼质量失控主要原因1.1 砼配制强度偏低。由于实验和施工现场条件的差异,砼的配制强度应比实验室设计强度提高一定数值,以提高相应的强度保证率。但有些搅拌站或施工单位一味追求效益,降低成本,采用低配比,造成砼配制强度过低,从而影响工程质量。1.2 现场加水导致水灰比过大。有些技术人员和操作工人对现场加水破坏砼耐久性、和易性认识不足,以为用水稀释拌和物,增大落度,便于搅拌、泵送、浇筑。殊不知,合理水灰比每增加0.05,砼强度就可能降低10MPa,另外搅拌好的砼是水与水泥、水泥浆与砂子、砂浆与石子之间彼此包裹和填充的混合物
A main reason for the loss of quality control of concrete 1.1 Concrete formula strength is low. Due to the difference of experimental and construction site conditions, the strength of concrete preparation should be higher than the laboratory design strength by a certain value in order to improve the corresponding strength assurance rate. However, some mixing stations or construction units blindly pursue the benefits and reduce costs, the use of low ratio, resulting in the strength of the concrete preparation is too low, thus affecting the quality of the project. 1.2 water on site led to excessive water-cement ratio. Some technicians and operators on the scene of water damage to concrete durability, ease of understanding lack of knowledge that diluted with water mixing, increase the degree of easy mixing, pumping, pouring. As everyone knows, a reasonable increase of 0.05 for the water-cement ratio, the concrete strength may be reduced by 10MPa, the other is a good mix of water and cement, cement and sand, mortar and gravel between each other wrapped and filled mixture