橡胶颗粒改性水泥砂浆的微观孔结构研究  

Study on Micro Pores Structure of Cement Mortar Modified by Rubber Particles

作　　者：周仙奕 莫俊杰 ZHOU Xianyi;MO Junjie(Dalian International Airport Co.,Ltd.,Dalian Liaoning 116033;Highway Maintenance Center of Sanshui District of Foshan,Foshan Guangdong 528100)

机构地区：[1]大连国际机场股份有限公司,辽宁大连116033 [2]佛山市三水区公路养护中心,广东佛山528100

出　　处：《广东公路交通》2022年第4期7-11,共5页Guangdong Highway Communications

摘　　要：橡胶颗粒改性后的水泥稳定碎石、水泥混凝土等材料具有高耐久性、低成本、环保等优点。为研究此类型水泥基材料中水泥在橡胶作用下微观孔隙的变化,采用量化压汞试验法,选用掺入比例为2%、4%、6%的60目橡胶颗粒的水泥砂浆进行试验,并通过分析不同橡胶掺量的水泥砂浆的孔径分布,对比研究橡胶改性水泥砂浆的微观孔结构变化。结果表明:掺入较低含量的橡胶颗粒改性后水泥砂浆的孔隙率会减少,但比孔容反而增加;橡胶颗粒能够改变水泥砂浆孔隙分布,使孔结构变得均匀;橡胶颗粒会增加水泥砂浆的毛细孔和引气孔体积,从而降低水泥砂浆的抗压强度,但养护时间的延长和橡胶颗粒含量的适当增加能够抑制这种不利现象。The cement stabilized macadam and cement concrete modified by rubber particles have the advantages of high durability,low cost and environmental protection.In order to study the change of micro pores of cement in this type of cement-based materials under the action of rubber,in this paper,the quantitative mercury injection test method has been adopted,the water mud mortar with 60 mesh modified rubber particles with the proportion of 2%,4%and 6%has been selected,and the pore size distribution of cement mortar with different amount of rubber particles has been analyzed,to comparatively research the changes of micro pore structure of rubber particle modified cement mortar.The results have shown that the porosity of the rubber particle modified cement mortar will decrease,but the specific pore volume will increase;rubber particles may cause uneven pore distribution of cement mortar,and increase the volume of capillary pores and blow hole of cement mortar,thus reducing the compressive strength of cement mortar,but the extension of curing time and the appropriate increase of rubber particle content can inhibit this adverse influence of rubber particles.

关 键 词：水泥砂浆 橡胶颗粒 压汞试验 孔结构 

分 类 号：U414[交通运输工程—道路与铁道工程]