摘要
基于分档掺配理论设计7种水泥稳定再生混合料级配方案,通过振动击实法和重型击实法测定不同级配下水稳再生混合料最佳含水率和最大干密度;选取水泥掺量为3.5%、4.0%、4.5%时,对比振动成型和静压成型工艺,测定水稳再生混合料的7d无侧限抗压强度、28d抗弯拉强度和吸水率,研究级配、成型工艺、水泥掺量对水稳再生混合料性能的影响。结果表明:振动击实法下水稳再生集料的最大干密度较大,最佳含水率较小;振动成型法相比静压成型法水泥稳定再生集料7d无侧限抗压强度提高50%以上,28d抗弯拉强度提高30%以上,吸水率降低10%左右;水泥稳定再生混合料配合比设计过程中,选用天然碎石20～30mm完全替代建筑垃圾再生集料,10～30mm作为骨架结构,选用再生集料0～5mm完全替代天然石屑作为填充,水泥稳定再生混合料的力学性能最佳。
Seven different gradations were designed based on the blending theory.The optimum moisture content and maximum dry density of water-stable recycled mixes with different gradation were determined by vibratory compaction method and heavy compaction method.The cement contents of 3.5%,4.0%and 4.5%were selected and the vibration molding and static pressure forming process were both used.The waster absorption ratio,7-day unconfined compressive strength and 28-day bending strength were determined to study the effects of gradation,molding process and cement content on the performance of cement stabilized recycling materials.The results showed that the maximum dry density of the cement stabilized recycling aggregate was higher under the vibratory compaction method than that under the static compaction whereas the optimum water content was lower for the vibratory compaction.The 7-day unconfined compressive strength was increased by more than 50%and the 28-day bending strength was increased by more than 30%under the vibratory compaction over the static compaction.The water absorption rate was reduced by about 10%for the vibratory compaction over the static compaction.In the design process of the cement stabilized recycled mixture,the natural gravel 20-30 mm was recommended to be used to completely replace the construction waste recycling aggregate 10-30 mm while the skeleton structure made of recycled aggregate 0-5 mm was recommended to replace natural stone chips for filling,which will produce the optimum mechanical performance.
作者
马融
陈飞
MA Rong;CHEN Fei(Research Institute of Highway Ministry of Transport,Beijing 100088,China)
出处
《中国科技论文》
CAS
北大核心
2019年第2期129-134,共6页
China Sciencepaper
基金
山西省交通运输厅科技项目(2018-1-1)
关键词
道路工程
建筑垃圾再生集料
水泥稳定再生混合料
成型方法
配合比设计
road engineering
construction waste recycling aggregate
cement stabilized recycled mixture
molding method
mix ratio design
