不同物态配比碱渣-粉煤灰混合料强度特性  

Strength characteristics of soda residue-fly ash mixture with different proportions and phases

作　　者：马加骁 闫楠[1,2] 白晓宇 张明义[1,2] 刘俊伟 王永洪[1,2] MA Jia-xiao;YAN Nan;BAI Xiao-yu;ZHANG Ming-yi;LIU Jun-wei;WANG Yong-hong(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Cooperative Innovation Center ofEngineering Construction and Safety in Shandong Blue Economic Zone,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]山东省高等学校蓝色经济区工程建设与安全协同创新中心,山东青岛266033

出　　处：《岩土工程学报》2021年第5期893-900,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51809146);山东省重点研发计划项目(2018GSF117008)。

摘　　要：为改善传统碱渣土填筑方法工艺复杂、耗时较长的缺点,以山东海化集团的碱渣和粉煤灰为原材料,对不同物态和配比的碱渣土进行了室外填筑试验,并通过室内试验对液相填筑碱渣土的均匀性和强度进行改良。采用击实试验、轻型动力触探试验、便携式可变能量动力触探试验对现场填筑碱渣土的强度特性进行测试表征;采用自制的沉淀器模拟液相碱渣土的一维固结沉降,对液相填筑碱渣土的均匀性和强度进行改良和测试。结果表明,碱渣与粉煤灰固体的最优质量配比为7∶3,其最大干密度和最优含水率分别为0.88 g/cm3,64%。碱渣土液相填筑具有可行性,且液相填筑碱渣土的土体强度及均匀性明显优于液相-固相填筑的碱渣土。液相填筑的碱渣土存在一定的分层现象,电离子土壤固化剂能进一步提高土体均匀性,其最优掺量为0.019%。在碱渣土中掺入7%的石灰粉能有效激发粉煤灰活性,大幅提高碱渣土的承载能力。试验结果可指导碱渣土的填筑施工,进一步提高碱渣土的填筑效率和质量。In order to correct the shortcomings of the traditional soda residue soil filling method,which is complicated and time-consuming,the outdoor filling tests are carried out on the soda residue soil with different material states and ratios using the soda residue and fly ash from Shandong Haihua Group as raw materials,and the uniformity and strength of the liquid phase filling soda residue soil are improved through laboratory tests.The strength characteristics of the site filled soda residue soil are measured by the compaction tests,light dynamic contact tests and portable variable energy dynamic contact tests.The uniformity and strength of liquid-filled soda residue soil are improved and tested by using the self-made precipitator.The results show that the optimal ratio of solid mass of soda residue to fly ash is 7:3,and the maximum dry density and optimal water content are 0.88 g/cm3 and 64%.It is feasible to fill the soda residue soil by liquid phase,and the strength and the uniformity of soil with liquid phase are obviously better than those with solid phase.There is a certain stratification of the liquid filled alkaline residua soil.The electrotonic soil stabilizer can further improve the uniformity of the soil,and the optimal dosage is 0.019%.Adding 7%lime powder into the soda residua soil can effectively stimulate the activity of fly ash and greatly improve the bearing capacity of the soda residua soil.The experimental results can be used to guide the construction of the soda residue soil and further improve its filling efficiency and quality.

关 键 词：碱渣 粉煤灰 填筑方法 室外试验 改良试验 

分 类 号：TU442[建筑科学—岩土工程]