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关于水泥强度标准评价方法的探讨
作者:徐永模 白显明 郭俊萍 
单位:中国建筑材料工业协会 中国建筑材料科学研究院 中国建筑材料科学研究院 北京100831  北京100024  北京100024 
关键词:水泥  强度  评价方法  窑型  混合材 
分类号:TQ172
出版年,卷(期):页码:2003,31(5):458-464
DOI:
摘要:
从水泥强度与水灰比的函数关系和高性能混凝土材料的发展对全面准确评价水泥性能的要求出发 ,分析了现行ISO水泥标准强度性能评价方法的局限性。通过对不同窑型生产的相同强度等级水泥的抗压强度与水灰比关系的试验研究 ,表明在较高和较低的水灰比范围内 ,相同等级的不同水泥强度可能存在显著的差别。通过对掺矿渣、粉煤灰和沸石水泥在不同掺量和不同水灰比条件下强度发展的研究 ,进一步说明了矿物混合材对这种强度差异的影响。理论分析和试验结果说明 ,由单一水灰比确定的水泥强度等级既不能全面表征水泥强度取决于水灰比的特性 ,也不能区别相同强度等级的不同水泥。最后对水泥强度标准评价方法的改进提出了建议。
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This paper experimentally shows the limits of the present standard methods of evaluating cement strength grade.The results demonstrate that cements with the same strength grade but produced by different calcinating processes,such as shaft kilns and rotary ilns showed significant differences in strength at lower water/cement ratios.Different mineral blends such as slag,flyash and zeolite also displayed its important influence on the strength difference.The cement strength grade determined by a single water/cement ration at 0.5 might neither provide correct information on strength properties that depend on water/cement ratios,nor make difference in strength properties between different cements that have the same strength grade. In view of the nonlinear relationship between the strength and water/cement ratio,ever-increasing use of mineral additives which have different effects on strength development,and the deveolpment of high performance concretes,it is suggested that the strength evaluation at a lower cement ratio is needed at least to reliably indicate the strength behavior both at higher and lower water/cement ratios and the difference between different cements.
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