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[问]由于砂含泥土杂物超过国家标准规定的5%,影响混凝土强度时,能不能用增加水泥量的办法来补偿。请给予解答。(湖北覃发俊)[答]您所提出的问题,我认为仅仅考虑对混凝土强度的影响是不够全面的。因为砂的含泥量不仅对混凝土的强度有影响,而且,对混凝土的干缩裂缝和耐久性等都有直接影响。对砂的含泥量要求,原则上应按国家标准规定执行.即100号以内(包括100号)的混凝土,砂含泥量不大于5%,也可以酌情放
[Q] When sand inclusions exceed 5% of the national standard and affect the concrete strength, can it be compensated by increasing the amount of cement. Please give answers. (Hubei Fufa Jun) [Answer] The question you raised, I think that considering only the impact on the concrete strength is not comprehensive enough. Because the clay content of sand not only affects the strength of the concrete, but also has a direct impact on the shrinkage cracking and durability of concrete. The mud content requirement for sand shall, in principle, be implemented in accordance with the national standards. That is, within the No. 100 (including No. 100) concrete, the sand content shall not exceed 5%, and it may also be put in discretion.