摘要
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。
Coarse and fine aggregate gradation limitation, ingredient proportion calculation method and formula parameter testing method for skeleton-closed cement fly-ash stabilized aggregate mixture design were presented. On the basis of research above, cement fly-ash stabilized aggregate which contains 4% cement, 11% fly-ash, and 85% aggregate was designed, then the samples were made to compare its compressive strength , temperature shrinkage coefficient and dry shrinkage coefficients to those of suspending-closed cement stabilized aggregate and skeleton-closed cement stabilized aggregate with the same cement content through lab experiments. The results show that （1） coarse aggregate in skeleton-closed cement fly-ash stabilized aggregate designed according abovementioned calculation method can reach dense status easily after compaction, and coarse aggregate in the mixture can form good skeleton structure; （2） the 28 d and 90 d unconfined compressive strengths of skeleton-closed cement fly-ash stabilized aggregate are better than the corresponding performance of suspend-closed and skeleton-closed cement stabilized aggregates; （3） skeleton-closed cement fly-ash stabilized aggregate has less temperature shrinkage coefficient and dry shrinkage coefficient.
出处
《公路交通科技》
CAS
CSCD
北大核心
2010年第9期18-22,共5页
Journal of Highway and Transportation Research and Development
基金
交通部西部交通建设科技资助项目(200631881218)
关键词
道路工程
水泥粉煤灰稳定集料
材料组成设计
抗压强度
收缩系数
road engineering
cement fly-ash stabilized aggregate
mixture component design
compressive strength
shrinkage coefficient
作者简介
胡力群（1971-），男，陕西西安人，副教授，工学博士，研究方向为路面材料性能与试验．（hlq123@126．com）
