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通过研究推荐了适用于骨架密实结构水泥粉煤灰稳定集料的粗、细集料级配范围,并给出了混合料中水泥、粉煤灰、粗集料以及细集料等材料比例的计算方法,同时提供了计算过程中相关参数的确定方法。采用该法设计了水泥用量为4%、粉煤灰含量为11%、集料含量为85%的水泥粉煤灰稳定集料,并与水泥用量相同的悬浮密实结构水泥稳定碎石、骨架密实结构水泥稳定集料的抗压强度、温度和干燥收缩系数进行了对比试验。试验结果表明:采用上述计算方法设计的骨架密实结构水泥粉煤灰稳定碎石混合料中粗集料能够形成良好的骨架结构,同时在压实后整体密实,其28、90 d的抗压强度大于悬浮密实结构和骨架密实结构水泥稳定集料相应龄期的抗压强度,而且具有较小的温度收缩系数和干燥收缩系数。
Through the research, the grading range of coarse and fine aggregate suitable for the stable structure of cement fly ash with solid skeleton structure is recommended, and the proportions of cement, fly ash, coarse aggregate and fine aggregate in the mixture are given Calculation method, at the same time provides a calculation method of determining the relevant parameters. The method was used to design a cement fly ash stabilized aggregate with 4% cement, 11% fly ash and 85% aggregate, and was compacted with cement-stabilized macadam with the same cement content Compressive strength, temperature and drying shrinkage coefficient of cement stabilized aggregates were compared. The test results show that the coarse aggregates in the cement-flyash stabilized macadam mixture with the skeleton solid structure designed by the above calculation method can form a good skeleton structure, and meanwhile, the compacted solid aggregate has a compressive strength of 28,90 d Which is greater than the compressive strength of the cement-stabilized aggregate with suspended solid structure and skeleton solidified structure, and has smaller temperature shrinkage coefficient and dry shrinkage coefficient.