碱激发免蒸压加气混凝土的研究

Research on the Properties of Non-autoclaved Aerated Concrete Prepared by Alkali Activated Phosphorus Slag

对碱激发磷渣制备免蒸压加气混凝土进行了研究,讨论了粉煤灰掺量、碱含量、水玻璃模数、养护制度等因素对加气混凝土发气速度、稠化速度及容重、强度等性能的影响。并使用SEM、XRD等手段对水化产物进行了微观分析。研究结果表明激发剂的碱含量是影响加气混凝土性能的主要因素,同时在水玻璃模数为1.2、碱含量为6%和60℃蒸汽养护的条件下可以制备出28 d强度高达11.9 MPa容重为806 kg/m3的加气混凝土。

The study examined the feasibility of manufacturing aerated concrete using alkali activated phosphorus slag as a cementitious material.The concentration of fly ash,modulus of sodium silicate solution and concentration of alkalis and curing procedure on the compressive strength and bulk density of aerated concrete have been studied.Moreover,the types of the hydration products were investigated using XRD and SEM.The results indicate that the compressive strength of aerated concrete was influenced by concentration of alkalis obviously.The compressive strength of 11.9 MPa and the bulk density of 806 kg/m3 were achieved under the circumstance of 60 ℃ curing,1.2 modulus of sodium silicate and 6% concentration of alkalis.