By X-ray diffraction,scanning electron microscope and concrete test,the influence of powder content of artificial limestone aggregate on the types,content of concrete hydration products and concrete mechanical property are studied.The analysis results show that the calcium carbonate in artificial limestone aggregate reacts with cement hydration products and forms calcium carboaluminate hydrate that increases with stone powder content and age.The formation of calcium carboaluminate hydrate on the interface of aggregate-slurry affects the formation and growth of the oriented calcium hydroxide crystal on the interface,which improves the microstructure and the weak interface zone of concrete,macroscopically,it can improve the mechanical properties of concrete.%采用X射线衍射、扫描电镜和混凝土实验方法,研究了灰岩人工砂中石粉含量对混凝土水化产物种类、含量及混凝土力学性能的影响.结果表明:灰岩人工砂中的碳酸钙与水泥水化产物发生水化反应,形成水化碳铝酸钙,其含量随石粉含量及龄期的增长而增加;水化碳铝酸钙在集料-浆体界面的形成影响了界面上定向氢氧化钙晶体的形成与生长,从微观上改善了混凝土的结构,强化了薄弱的界面区,宏观上提高了混凝土的力学性能.
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