粉煤灰微珠粒径及掺量对灌浆料性能的影响  

Influence of particle size and dosing of fly ash microbeads on performance of grout

作　　者：何锐[1] 柴华 安炬峰 李亮亮 王振军[1] 杨水平 HE Rui;CHAI Hua;AN Ju-feng;LI Liang-liang;WANG Zhen-jun;YANG Shui-ping(School of Materials Science and Engineering,Chang’an University,Xi’an 710010,Shannxi,China;CCCC-SHB Fourth Engineering Co,Ltd.,Luoyang 471000,Henan,China;Gansu Province Linxia Highway Development Center Shuangcheng Highway Section,Linxia 731800,Gansu,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710010 [2]中交二公局第四工程有限公司,河南洛阳471000 [3]甘肃省临夏公路事业发展中心双城公路段,甘肃临夏731800

出　　处：《长安大学学报（自然科学版）》2024年第4期15-26,共12页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(52278429);陕西省重点研发计划项目(2023-ZDLGY-25,2023-YBGY-495);陕西省交通科技项目(21-50K,23-91K);中央高校基本科研业务费专项资金项目(300102312402)。

摘　　要：为了探究粉煤灰微珠粒径及掺量对灌浆料性能的影响,选取了4种不同粒径的粉煤灰微珠制备灌浆料试样,测试其流动度与抗压强度,并采用气孔结构分析仪、等温微量热仪与扫描电镜(SEM),分析灌浆料孔隙结构参数、水化放热特性与微观形貌的变化,探讨了粉煤灰微珠对灌浆料性能的影响机理。试验结果表明:小粒径(≤45μm)的粉煤灰微珠有助于增加灌浆料的流动性和提升灌浆料的28 d强度,且当10μm的微珠掺量(质量分数,下同)为10%时,28 d抗压强度最大;粉煤灰微珠的掺加增大了灌浆料的总含气量,当10μm的微珠掺量为5%时,可以细化并改善材料的孔结构;随着粉煤灰微珠掺量的增加,水化放热量降低显著,且水化放热量随着粉煤灰微珠粒径的增大而降低;SEM微观分析显示小粒径的粉煤灰微珠表面生成了更多的水化产物。总体来看,掺入5%~10%小粒径的粉煤灰微珠,可以显著提升灌浆料工作性能和28 d抗压强度,且降低灌浆料的水化放热。In order to investigate the influence of the particle size and dosage of fly ash microbeads on the performance of grout,four types of fly ash microbeads with different particle sizes were selected to prepare grout and test its fluidity and compressive strength.The pore structure analyzer,isothermal microcalorimeter and scanning electron microscope(SEM)were used to analyze the changes of pore structure parameters,hydration exothermic properties and microscopic morphology of the grout,and to explore the influence mechanism of fly ash microbeads on the performance of the grout.The results show that small particle size(≤45μm)of the fly ash microbeads help to increase the fluidity of the grout and enhance the 28dstrength of the grout,and when 10μm beads dosage(mass fraction,the same below)is 10%,the 28d compressive strength is the largest.Fly ash microbeads doping increase the total air content of the grout,when 10μm beads dosage is 5%,it can be refined and improve the pore structure of the material.With the increase of the dosage of fly ash microbeads,the decrease of the exothermic heat of hydration is more significant,and the exothermic heat of hydration decreases with the increase of the particle size of fly ash microbeads.SEM microanalysis shows that the surface of fly ash microbeads with small particle size generates more hydration products.Overall,the incorporation of 5%to 10%small particle size fly ash microbeads can significantly improve the working performance and 28dcompressive strength of the grout,and reduce the exothermic heat of hydration of the grout.4tabs,19figs,26refs.

关 键 词：道路工程 粉煤灰微珠 粒径 流动度 抗压强度 孔隙结构 水化热 

分 类 号：U414[交通运输工程—道路与铁道工程]