高分子乳液对水泥基充填材料性能的影响  

Effect of Polymer Emulsion on Properties of Cement-Based Filling Materials

作　　者：皇甫婧琪 何强 HUANGFU Jingqi;HE Qiang(Shanxi Vocational University of Engineering Science and Technology,Jinzhong,Shanxi 030619,China;School of Civil Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]山西工程科技职业大学,山西晋中市030619 [2]太原理工大学土木工程学院,山西太原030024

出　　处：《矿业研究与开发》2023年第4期23-29,共7页Mining Research and Development

基　　金：国家自然科学基金项目(51911530238)。

摘　　要：为解决水泥基充填材料存在的流动性差、强度低的问题,提出以高分子乳液改性其性能。对比研究了苯丙乳液、纯丙乳液、VAE乳液3种乳液对充填料浆流动性能和力学性能的影响,采用SEM扫描电镜观测微观结构形貌。结果表明:2%掺量的苯丙乳液和6%掺量的纯丙乳液对浆体流动度具有促进作用;VAE乳液则增加了浆体黏度,但对充填体抗压强度和抗折强度的改性效果优于苯丙乳液和纯丙乳液,当VAE乳液掺量为10%时,充填体3 d、7 d抗压强度和抗折强度达最大值为12.82 MPa、16.55 MPa和4.37 MPa、5.63 MPa;当VAE乳液掺量为6%时,28 d抗压强度和抗折强度达最大值为16.25 MPa和5.63 MPa。苯丙乳液对充填体的抗拉强度改性效果最好,当苯丙乳液掺量为10%时,充填体3 d、7 d和28 d抗拉强度达最大值为1.77 MPa、2.55 MPa、2.91 MPa。随着水化龄期的延长,聚合物乳液改性充填体微观结构形貌由细针状钙矾石和絮状C-S-H凝胶发育为短棒状和团聚状,水化产物与乳胶颗粒构筑成紧密结合的有机-无机三维互穿网状结构,填充至骨料基体孔隙之间,使充填体具备良好的宏观力学性能。In order to solve the problems of poor flowability and low strength of cementitious filling materials,a method was proposed to modify their properties with polymer emulsions.The effects of three kinds of emulsions,namely,benzene propylene emulsion,pure propylene emulsion and VAE emulsion,on the flowability and mechanical properties of the filling slurry were comparatively studied.SEM was used to observe the microstructure and morphology.The results show that the 2%of benzene propylene emulsion and 6%of pure propylene emulsion can promote the flowability of the slurry.The VAE emulsion will increase the viscosity of the slurry,and can modify the compressive strength and flexural strength of the backfill better than styrene-acrylic emulsions and pure acrylic emulsions.When the content of VAE emulsions content is 1o%,the maximum compressive strength and flexural strength of the backfill reach 12.82 MPa,16.55 MPa and 4.37 MPa,5.63 MPa.When the content of VAE emulsion is 6%,the maximum compressive strength and flexural strength reach 16.25 MPa and 5.63 MPa at 28 d.Styrene-acrylic emulsion has the best modification effect on the tensile strength of the backfill.When the content of styrene-acrylic emulsion is 10%,the maximum tensile strength of the backfill reaches 1.77 MPa,2.55 MPa and 2.91 MPa at 3,7 and 28 days.With the increasing age of hydration,the microstructure morphology of backfill modified by polymer emulsion develops from fine needle-like calcium alumina and flocculent C-S-H gel to short rods and agglomerates,and the hydration products and emulsion particles form a tightly integrated organic-inorganic three-dimensional interpenetrating mesh structure,which fill the pores of the aggregate matrix and gave the filler good macroscopic and mechanical properties.The backfill has good macroscopic mechanical properties.

关 键 词：聚合物乳液 充填体 料浆流动性 力学性能 微观形貌 

分 类 号：TD853.34[矿业工程—金属矿开采]