石灰粉煤灰稳定再生料基层级配设计与力学性能研究  

Study on Base Gradation Design and Mechanical Properties of Lime-Fly Ash Stabilized Recycled Materials

作　　者：杨雄杰 寇轩 常超 蔡润池 李瑞云 Yang Xiongjie;Kou Xuan;Chang Chao;Cai Runchi;Li Ruiyun(Shaanxi Huashan Road and Bridge Group Co.,Ltd.,Xi'an 710005,China;Shaanxi Zhengcheng Road and Bridge Engineering Research Institute Co.,Ltd.,Xi'an 712000,China)

机构地区：[1]陕西华山路桥集团有限公司,陕西西安710005 [2]陕西正诚路桥工程研究院有限公司,陕西西安712000

出　　处：《市政技术》2024年第5期40-46,共7页Journal of Municipal Technology

摘　　要：为了获取再生砖混料用于道路基层混合料的适宜掺量,研究了石灰粉煤灰稳定再生料基层的配合比与力学性能间的作用关系,即:首先进行混合料级配设计,通过分级填充振捣试验确定粗集料比例;然后以室内击实试验确定细集料占比,同时以压碎值和无侧限抗压强度确定再生料的掺配方式;最后进行不同再生料掺量和石灰粉煤灰稳定类无机结合料剂量下的无侧限抗压强度和抗压回弹模量试验,确定其力学性能的变化规律。研究结果表明:3档粗集料比例为19∶22∶17,细集料占比为42.5%时密实程度最好;以再生料方式替换的砖混比为4∶6,粒径替换顺序为先10~20 mm、再5~10 mm;7 d和28 d抗压强度最大值分别达到1.347、2.756 MPa,且二者随再生料掺量的增加其衰减趋势相似;在高再生料掺量下采用20%~25%石灰粉煤灰剂量的180 d抗压回弹模量效果较好;7 d无侧限抗压强度与180 d抗压回弹模量的拟合度较高。该石灰粉煤灰稳定再生料类基层的配合比设计方案验证了建筑垃圾粗集料用于道路基层的可行性,并且建立了抗压回弹模量与抗压强度值的关系模型,可为建筑垃圾在道路基层施工的应用提供参考。In order to obtain the appropriate dosage of recycled brick mixture for road base mixture,the relationship between the mix ratio and mechanical properties of lime fly ash stabilized recycled material base was studied.Firstly,the gradation design of the mixture was carried out,and the proportion of coarse aggregate was determined by grad-ing filling vibration test;Then,the proportion of fine aggregate was determined by indoor compaction test.The mix-ing way of recycled material was determined by crushing value and unconfined compressive strength;Finally,under different dosage of recycled materials and lime fly ash stabilized inorganic binders,the unconfined compressive strength and compressive resilient modulus tests were carried out to determine the variation of mechanical properties.The results show that the compactness is the best when the proportion of coarse aggregate is 19:22:17 and the pro-portion of fine aggregate is 42.5%;The brick-concrete ratio replaced by recycled material is 4:6 with the order of particle size replacement is 10~20 mm first and then 5~10 mm;The maximum compressive strength on 7 d and 28 d reach 1.347 and 2.756 MPa respectively,and the increase of the amount of recycled materials was similar with the attenuation trend;Under high recycled material content,the compressive resilient modulus with 20%~25%lime fly ash dosage on 180 d is better;The fitting degree of unconfined compressive strength on 7 d and 180 d is higher.The feasibility of construction waste coarse aggregate for road base is verified by the mix ratio design scheme,and the relationship model between compressive rebound modulus and compressive strength value is estab-lished,which provide reference for the application of construction waste in road base construction.

关 键 词：石灰粉煤灰 再生料 基层级配设计 无侧限抗压强度 抗压回弹模量 

分 类 号：U414.1[交通运输工程—道路与铁道工程]