FPCC改良过湿土力学性能及微观特性研究  

Study on Mechanical Properties and Microscopic Characteristics of FPCC Improved Over⁃Wet Soil

作　　者：孟宪金[1,2] 李嘉衡 王运涛 MENG Xianjin;LI Jiaheng;WANG Yuntao(School of Civil and Transportation Engineering,Yellow River Conservancy Technical Institute,Kaifeng 475004,China;Kaifeng Civil Engineering Quality Testing Research Center,Kaifeng 475004,China;Yellow River Kaifeng Bureau,Kaifeng 475000,China)

机构地区：[1]黄河水利职业技术学院,河南开封475004 [2]开封市土木工程质量检测研究中心,河南开封475004 [3]开封黄河河务局,河南开封475000

出　　处：《人民黄河》2024年第6期152-156,162,共6页Yellow River

基　　金：河南省高校科技创新人才项目(21HASTT129);开封市2023年度科技计划项目(2301003)。

摘　　要：为达到提高过湿土强度并合理利用工业固废的目的,利用粉煤灰、磷渣、电石渣及水泥所制备的煤灰-磷渣-电石渣-水泥胶凝材料(FPCC)对过湿土进行改良,对FPCC掺量分别为4%、6%、8%及10%的过湿土进行无侧限抗压强度试验、加州承载比(CBR)试验、抗压回弹模量试验和电子显微镜(SEM)微观扫描,并利用Matlab软件与Image-Pro Plus(IPP)软件分析其孔隙特征及分布情况,FPCC改良过湿土的力学性能及微观特性。结果表明:FPCC用于过湿土改良效果显著,掺加6%FPCC时过湿土28 d龄期各指标均满足使用要求;28 d龄期FPCC过湿土中产生了大量水化产物,随着掺量的增大,水化产物增多;随着FPCC掺量的增大,土体内部孔隙率降低、孔隙直径减小、孔隙丰度增大及孔隙定向角有序化。FPCC改良过湿土具有良好的强度及承载能力,考虑到节约水泥用量以及更合理地利用工业固废,建议FPCC掺量为6%。In order to improve the strength of over-wet soil and make rational use of industrial solid waste,coal ash-phosphorus slag-carbide slag-cement cementitious material(referred to as FPCC material)prepared by fly ash,phosphorus slag,carbide slag and cement was used to improve over-wet soil.The unconfined compressive strength test,California bearing ratio(CBR)test,compressive rebound modulus test and scanning electron microscope(SEM)test were carried out on the FPCC over-wet soil with the content of 4%,6%,8%,and 10%respective-ly.The pore characteristics and distribution were observed by Matlab software and Image-Pro Plus(IPP)software,and the mechanical prop-erties and microscopic characteristics of FPCC cementitious materials and improved over-wet soil were analyzed.The results show that the FPCC cementitious material has a significant effect on the improvement of overwet soil.When 6%FPCC is added,all indexes of 28 d age meet the requirements of use.A large number of hydration products are produced in FPCC over-wet soil at 28 d age,and the hydration prod-ucts increase with the increase of dosage.With the increase of FPCC cementitious material,the internal porosity of the soil decreases,the pore diameter decreases,the pore abundance increases and the pore orientation angle is ordered.It can be seen that the FPCC cementitious material and the improved over-wet soil have good strength and bearing capacity.Considering the saving of cement dosage and the more ration-al use of industrial solid waste,it is recommended that the FPCC content is 6%.

关 键 词：过湿土 工业固废 FPCC 力学性能 微观结构 

分 类 号：TV42[水利工程—水工结构工程] U416[交通运输工程—道路与铁道工程]