【摘要】 结合汞压力测孔法,试验研究了水胶质量比为0.25~0.35,矿渣微粉掺量为0~60%时高性能混凝土的抗压强度、气体渗透性以及孔结构,并探讨了抗压强度与气体渗透性之间的关系.研究表明:延长28d后的养护龄期能明显提高高性能混凝土抗压强度,矿渣微粉对抗压强度的影响因水胶质量比不同而存在一定差异;对优化高性能混凝土抗气体渗透性能而言,矿渣微粉掺量存在一最佳值;适当延长28 d后的养护龄期能明显提高混凝土的抗渗透性能;90 d龄期时,矿渣微粉对高性能混凝土孔隙率总体上影响不大,但能细化孔径,增加无害孔、少害孔的总比例;矿渣微粉高性能混凝土抗压强度与气体渗透系数间的线性相关性较差,相关系数仅为0.75.更多还原

【Abstract】 Based on the mercury intrusion porosimetry,a study is made of the compressive strength,gas permeability and pore structure of high performance concrete(HPC) containing slag powder with water-binder ratios(w/b) ranging from 0.25 to 0.35 and replacement of slag powder varying from 0% to 60%in mass percentage.An analysis is made of the relationships between compressive strength and gas permeability of HPC.The results show that prolonging curing ages can have a marked effect on improving compressive strength.Effects of slag powder on compressive strength differ for each w/b.And,there exists the best replacement of slag powder for the optimization of gas permeability.Prolonging curing ages can also have significant effects on optimizing gas permeability.Influence of slag powder on porosity of HPC at 90 d isn’t so great,while it can refine pore size.The linearity correlation between compressive strength and gas permeability is not so close,which is only 0.75.更多还原