硅灰-矿渣-电石渣协同固化黄泛区粉土力学性能与微观机理研究  

Mechanical Properties and Microscopic Mechanisms of Yellow Floodplain Silt Solidified by Silica Fume-Ground Granulated Blast Furnace Slag-Carbide Slag Synergy

作　　者：刘彦浩 刘路路 刘涛[1,2] 张艳 余刘成 张顶飞 战元喆 LIU Yanhao;LIU Lulu;LIU Tao;ZHANG Yan;YU Liucheng;ZHANG Dingfei;ZHAN Yuanzhe(Shandong Engineering Research Center for Underwater Construction and Protection,Ocean University of China,Qingdao 266100,China;Laboratory of Marine Geological Processes and Environmental Functions,Qingdao Marine Science and Technology Center,Qingdao 266237,China;College of Environmental Science and Engineering,Ocean University of China,Qingdao 266100,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;College of Civil Engineering,Anhui Jianzhu University,Hefei 230009,China)

机构地区：[1]中国海洋大学海底建设与保护山东省工程研究中心,青岛266100 [2]青岛海洋科技中心海洋地质过程与环境功能实验室,青岛266237 [3]中国海洋大学环境科学与工程学院,青岛266100 [4]中国矿业大学力学与土木工程学院,徐州221116 [5]安徽建筑大学土木工程学院,合肥230009

出　　处：《硅酸盐通报》2025年第4期1513-1524,共12页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(42277139,42207172);国家自然科学基金-联合基金重点支持项目(U2006213);安徽省智能地下探测与环境岩土工程研究中心开放课题(APIUDGERC23KF01)。

摘　　要：黄泛区粉土工程特性较差,需进行固化后才能作为路基填筑材料。但传统固化方案需要大量水泥,且水泥生产过程会消耗大量能源。为解决该问题,以硅灰(SF)和矿渣(GGBS)为前驱体,电石渣(CS)为激发剂,基于响应面法中的Box-Behnken design(BBD)试验,对比分析了不同配合比的硅灰-矿渣-电石渣(SGC)胶凝材料和水泥对黄泛区粉土的力学性能和水稳性的影响,并利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)探究了固化土的微观固化机理。结果表明,硅灰、矿渣、电石渣的最优质量配合比为5.94%∶21.87%∶4.31%。此配合比下固化土7、28 d无侧限抗压强度分别为6 531.58和9 269.26 kPa,相较于水泥固化土,7、28 d无侧限抗压强度分别提升28.3%和21.4%。SEM和XRD测试结果表明,SGC固化土的水化产物主要为水化硅酸钙(C-S-H)和水化铝酸钙(C-A-H)等胶凝物质,28 d龄期的SGC固化土微观形貌较水泥固化土更密实。SGC固化剂对黄泛区粉土改良效果显著,具有较好的工程应用价值。The engineering properties of yellow floodplain silt are poor,and it needs to be solidified before it can be used as a roadbed fill material.However,traditional solidification solutions require large amounts of cement,and the cement production process consumes large amounts of energy.To solve this problem,silica fume(SF)and ground granulated blast furnace slag(GGBS)were used as precursors,and carbide slag(CS)was used as an exciter,based on the Box-Behnken design(BBD)test in the response surface methodology,to compare and analyse the effects of different mix ratios of silica fume-ground granulated blast furnace slag-carbide slag(SGC)cementitious materials and cement on the mechanical properties and water stability of loess in yellow floodplain,and the microscopic solidified mechanism of the cured soil was explored by using X-ray diffraction(XRD)test and scanning electron microscope(SEM)test.The results show that the optimal mass mix ratio of silica fume,slag and calcium carbide slag is 5.94%∶21.87%∶4.31%.The 7、28 d unconfined compressive strength of solidified soil under this ratio is 6531.58 and 9269.26 kPa,respectively,which increase the 7,28 d unconfined compressive strength by 28.3%and 21.4%,respectively,compared with that of the cement solidified soil.SEM and XRD test results show that the main hydration products of SGC solidified soil are cementitious materials such as calcium silicate hydrate(C-S-H)and calcium aluminates hydrate(C-A-H),and the micro-morphology of SGC solidified soil at the age of 28 d is more compact than that of cement solidified soil.The effect of SGC stabilizer on the improvement of loess in yellow floodplain is significant,and it has good engineering application value.

关 键 词：黄泛区粉土 粉土固化 固化剂 响应面法 配合比优化 无侧限抗压强度 

分 类 号：TU447[建筑科学—岩土工程]