同水胶比下混凝土中水泥-矿渣-粉煤灰-硅灰的混料效应  

Mixing actions from slag,fly ash and silica fume in concrete on the same water-binder ratio condition

作　　者：唐明[1] 刘宏亮[1] 李婧琦[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,辽宁沈阳110168

出　　处：《混凝土》2011年第12期1-4,15,共5页Concrete

基　　金：国家自然科学基金(51078241);国家重点基础研究发展计划(973)项目(2009CB623106)

摘　　要：为探索同一水胶比下混凝土中水泥-矿渣-粉煤灰-硅灰多元掺合料对强度和渗透性的混料效应,通过混料设计,研究了同一水胶比下混凝土水泥、矿渣、粉煤灰和硅灰混料因子对7、28 d抗压强度和28 d电通量的影响。按多元混料回归设计的方法分析评价了各因素影响的内在规律,探讨了显著因素之间的交互作用。研究表明:建立的同一水胶比下水泥-矿渣-粉煤灰-硅灰多元混料7、28 d抗压强度和28 d电通量的回归模型都是非常显著的,在约束条件下绘制的三角坐标混料等高线很好地反映了混料因子间的内在规律,试验结果的直接分析中,单掺硅灰的抗压强度最高,电通量最低,但较高硅灰掺量会增加混凝土的成本。在28 d抗压强度满足设计要求的情况下,粉煤灰掺量和矿渣掺量分别在50%时的电通量和三元掺合料的电通量值也非常好。SEM结果分析表明,同一水胶比下,三元矿物掺合料显著改善了混凝土材料的显微结构,其宏观性能良好。In order to explore the mixing actions from the admixtures,include slag ash, fly ash and silica fume, on the strength and permeability of the same water-binder ratio concrete.Research factors as fly ash, slag and silica fume influence on the different strength grade of 7 d compressive strength, 28 d compressive strength and chloride diffusion performance of concrete had the same Water-binder ratio, followed the mixture de- sign.Use multielement regression analysis to evaluate the internal rules of the different influence factors, explore the interaction of significant fac- tors.Research shows that：the regression model between strength and the electric flux is very significant, the mixture equivalence contour of trian- gular coordinate can well display the＇related between mixture factors on the curbed condition.Showing in the visual analysis,the concrete only mixed silicon-ash have the best strength and chloride diffusion resistance, but mix overmuch silica fume cloud improve the costing.On the condition that may get applicable strength, concrete mixed with 50%add quantity slag ash or fly ash, can also get weU chloride diffusion rasistance.The results of SEM show that, the concrete of admixture with three species improve the microstructure of concrete material, therefore,it shows good macro properties.

关 键 词：混凝土 掺合料 氯离子扩散 显微结构 强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]