纳米SiO_(2)对粉煤灰复合水泥力学性能与微观孔隙的影响  

Effect of nano-SiO_(2)on mechanical properties and micro pores of fly ash composite cement

作　　者：苏飞鸣 张向新 刘畅 SU Feiming;ZHANG Xiangxin;LIU Chang(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;China Merchants Shekou Industrial Zone Holdings Co.,Ltd.,Shenzhen 518000,China;School of Civil and Environmental Engineering,University of Technology Sydney,Sydney 2007,Australia)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]招商局蛇口工业区控股股份有限公司,广东深圳518000 [3]悉尼科技大学信息工程学院,澳大利亚悉尼2007

出　　处：《混凝土》2024年第3期119-123,共5页Concrete

基　　金：国家自然科学基金(52168015,51768005);广西自然科学基金(2018GXNSFAA281333)。

摘　　要：适量的纳米二氧化硅可以提高粉煤灰复合水泥的强度,并促进水泥的二次水化,减少微观孔隙。然而,由于粉煤灰和纳米SiO_(2)的协同作用较为复杂,为了研究纳米SiO_(2)改性粉煤灰复合水泥的机理,测试了养护28 d时粉煤灰复合水泥抗压强度,并利用SEM、XRD与压汞法等测试手段进行了微观表征。研究结果表明:纳米SiO_(2)可以有效提高粉煤灰复合水泥的强度,并且还细化了其孔隙结构,增加了水泥中少害孔与无害孔的占比。当纳米SiO_(2)的掺量为3%时,抗压强度最高且孔隙率最低。Nano SiO_(2)can improve the strength of fly ash composite cement,promote the hydration of cement and reduce micro pores.However,due to the complex synergistic effect of fly ash and nano SiO_(2),in order to study the mechanism of nano SiO_(2)modified fly ash composite cement,the compressive strength of fly ash composite cement cured for 28 days was tested,and micro characterization was carried out by means of SEM,XRD and mercury intrusion method.The results show that nano SiO_(2)can effectively improve the strength of fly ash composite cement,refine its pore structure,and increase the proportion of less harmful pores and harmless pores in cement.

关 键 词：纳米二氧化硅 粉煤灰 水泥基材料 力学性能 孔隙率 

分 类 号：TU528.041[建筑科学—建筑技术科学]