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以不同水灰比、不同含气量、不同掺合料及不同掺合比例、不同养护方式下的混凝土为研究对象,研究了各配比混凝土的基本性能;并采用电通量法及氯离子渗透深度研究了混凝土的抗氯离子渗透性能。研究结果表明,减小水灰比、适当引气、加掺合料及良好的养护方式可有效改善混凝土的抗氯离子渗透性能,在一定掺量范围内,混凝土中掺硅粉比掺矿渣粉或粉煤灰的抗氯离子渗透性能好。在此基础上,提出了高寒地区有抗氯离子渗透性能要求的混凝土配制方案:含气量宜3%~5%;掺20%~30%粉煤灰或矿渣,或掺5%~8%的硅粉,硅粉和矿渣粉或粉煤灰双掺效果更好。
The concrete with different water-cement ratio, different gas content, different admixtures, different blending ratios and different curing modes was taken as the research object to study the basic performance of each proportion concrete. The electric flux method and the chloride ion penetration depth The chloride ion permeability of concrete was studied. The results show that reducing the ratio of water to cement, proper air entrainment, adding admixture and good curing methods can effectively improve the resistance to chloride ion permeability of concrete. Within a certain dosage range, Fly ash resistance to chloride ion permeability. On this basis, the concrete preparation scheme with resistance to chloride ion permeability in the alpine region is put forward: gas content should be 3% ~ 5%; 20% ~ 30% fly ash or slag, or 5% -8% Silica fume, silica fume and slag powder or fly ash double mixed effect better.