钢铁渣粉高性能混凝土的力学性能、耐久性及温升特性

我国钢渣年产量过亿吨,累计堆存量巨大,利用率低,已对生态环境构成严重危害。基于此,开展了钢铁渣粉在高性能混凝土中的应用研究,研究表明:钢铁渣粉掺量超过胶材总量30%时,混凝土抗压强度呈显著降低趋势,胶材总量中钢铁渣粉掺量越大影响越显著;随着钢铁渣粉掺量和胶材总量的增加,混凝土的抗渗性能得到显著提高;钢铁渣粉掺量占胶材总量的40%~50%时,混凝土的抗冻性能也相对较好。随着钢铁渣粉掺量增加,钢铁渣粉混凝土水化热显著降低。大体积混凝土试件温升试验表明,钢铁渣粉混凝土试件与双掺矿渣粉+粉煤灰混凝土试件相比,可显著降低混凝土试件中心的温升,有效抑制大体积混凝土试件的温升开裂问题。该成果可为钢铁渣粉在混凝土中的应用提供参考数据。

MECHANICAL PROPERTIES,DURABILITY AND TEMPERATURE RISE CHARACTERISTICS OF HIGH PERFORMANCE CONCRETE WITH IRON AND STEEL SLAG POWDER

The annual output of steel slag in China exceeds 100 million tons, with huge accumulated storage and low utilization rate, which has caused serious harm to the ecological environment. Based on this, this paper carried out the application research of steel slag powder in high performance concrete. The results showed that when the content of steel slag powder exceeded 30% of the total amount of binder, the compressive strength of concrete presented a significant reduction trend. The greater the content of steel slag powder in the total amount of glue material, the more significant its impact; with the increase of steel slag powder and glue material, the impermeability of concrete was significantly improved. When the amount of steel slag powder accounted for 40%~50% of the total amount of glue material, the frost resistance of concrete was relatively better. With the increase of steel slag powder content, the hydration heat of steel slag powder concrete decreased significantly. The temperature rise experiment of mass concrete specimen showed that the steel slag powder concrete specimen could significantly reduce the temperature rise in the center of the concrete specimen, and effectively inhibit the temperature rise cracking of mass concrete specimen, compared with the slag powder and fly ash mixed concrete specimen. The results provided a theoretical basis for the application of steel slag powder in concrete.