粒化高炉矿渣微粉对桥梁混凝土耐久性能影响

The effect of granulated blast furnace slag powder on the durability of bridge concrete

研究再生骨料强化处理技术(纯水泥浆、水泥浆+30%粉煤灰、水泥浆+10%硅灰和碳化处理)和粒化高炉矿渣微粉掺量(0%~60%)对混凝土收缩性能、抗氯离子渗透性能以及抗碳化性能的影响,并利用SEM分析混凝土微观结构。结果表明:随着粒化高炉矿渣微粉掺量增加,再生混凝土收缩值和氯离子渗透性显著降低,但会对混凝土抗碳化性能不利。GGBS可降低再生混凝土中Ca(OH)_2含量和尺寸,优化混凝土孔隙结构,增加密实度,提高耐久性能。

The enhanced treatment technology of recycled aggregate(pure cement slurry,cement slurry+30%fly ash,cement slurry+10%silica fume and Carbonization treatment)and granulated blast furnace slag powder content(0%~60%)affect the shrinkage performance,chloride ion penetration resistance and carbonization resistance of concrete.The microstructure of concrete is analyzed by SEM.The results show that with the increase in the amount of granulated blast furnace slag powder,the shrinkage value and chloride ion permeability of recycled concrete decrease significantly,but it will be detrimental to the anti-carbonization performance of concrete.GGBS can reduce the content and size of Ca(OH)2 in recycled concrete,optimize the pore structure of concrete,increase compactness,and improve its durability.