纳米SiO_2粒子掺杂的复合硅酸锂溶胶对混凝土后期水化的影响  

Effects of Composite Lithium Silicate Sol with Dispersed SiO_2 Nanoparticles on Post-hydration of Concrete

作　　者：郭苹[1] 邱琦[1] 罗仲宽[1] 陈雨叁[1] 廖丽丽[1] 施勇[1] 

机构地区：[1]深圳大学化学与化工学院,广东深圳518060

出　　处：《材料科学与工程学报》2010年第4期568-570,共3页Journal of Materials Science and Engineering

基　　金：深圳市科技计划资助项目(GJ200807210015A)

摘　　要：本文研究了硅酸锂溶胶及微量纳米SiO2粒子的掺杂对混凝土后期水化的影响。采用SEM、XRD、TG、BJH孔径分析等检测手段,证明复合硅酸锂溶胶可促使混凝土表层进一步水化,形成更多结构紧密质均的胶状C-S-H凝胶,从而有效填充混凝土内部的疏松孔洞。掺杂纳米SiO2粒子的硅酸锂溶胶对混凝土后期水化作用更明显,使C-S-H凝胶层间孔增加一倍多,有效地减少了毛细孔数量。Lithium silicate sol with dispersed SiO2 nanoparticles was studied for its effects on the post hydration of concrete.X-ray diffractometry（XRD）,scanning electron microscopy（SEM）,thermogravimetry（TG） and BJH pore analysis were employed to analyze the samples.After dispersing SiO_2 nanoparticles into the sol,the average pore size in the concrete dropped to about 20nm,nearly half the size as that of before the treatment.Moreover,lithium silicate sol shows positive effects on the concrete hydration,and a more compact structure of C-S-H was formed after post-hydration.Consequently,the composite lithium silicate sol could protect the concrete surface to a certain extent.The resultant gel could effectively fill the pores and holes in the concrete,therefore decrease the average diameter of pores and total pore volume.

关 键 词：混凝土水化 硅酸锂 纳米SIO2 孔径分析 

分 类 号：TQ172.724[化学工程—水泥工业] TQ172.46[化学工程—硅酸盐工业]