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经分析各种原因认为，混凝土没有完全硬化，是因为该混凝土用砂过细，且砂含泥量过大，同时混凝土搅拌时间过短。
Through analysis of various reasons, it is believed that the concrete is not completely hardened because the concrete sand is too fine and the sand contains too much mud, while the concrete mixing time is too short.