摘要
通过硬化水泥浆体孔结构、混凝土力学性能和氯离子渗透等性能的测试,研究了孔结构对不同强度等级混凝土抗渗性的影响。结果表明:直径小于20nm的孔与混凝土的强度及抗渗性均成正关联,为无害孔;直径大于20nm的孔与混凝土的强度及抗渗性均成负关联,为有害孔;硅灰和粉煤灰双掺及硅灰、粉煤灰和矿渣三掺对水泥浆体孔结构均产生不同程度的影响,可以减少有害孔,增加无害孔,同时还可以降低孔隙率,减小平均孔径及最可几孔径,增大孔表面积;在混凝土中掺入矿物掺合料进行孔结构的细化和优化是提高混凝土抗渗性的有效途径。
The effect of pore structure on the permeability of concrete with various strength grades was studied by performing tests on the pore structure of hardening cement paste and the mechanical properties and chloride permeability of concrete.The results show that,the pore which diameter is less than 20nm has a positive effect on the compressive strength and anti-permeability of concrete,is harmless to concrete,while the pore which diameter is greater than 20nm has a negative effect on the compressive strength and anti-permeability,is harmful.Both the admixture of silica fume（SF）-fly ash（FA） and the admixture of SF-FA-micro slag（MS） influence the pore structure of cement pastes,resulting in a decrease in volume fraction of harmful pore,an increase in volume fraction of harmless pore as well as a reduction in porosity,average pore size diameter and the most probable pore size and an enlarged total surface area.This study suggests that adding mineral admixture to refine and optimize pore structure is an efficient measure to improve the anti-permeability of concrete.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第3期196-201,共6页
Journal of Hydroelectric Engineering
关键词
水工材料
抗渗性
试验分析
混凝土
孔结构
矿物掺合料
灰色关联分析
hydraulic material
anti-permeability
experimental analysis
concrete
pore structure
mineral admixture
grey incidence analysis
