高钛矿渣超高性能混凝土的制备研究

Study on Preparation of PVA Fiber Reinforced Cement Matrix Composites

我国攀西地区钒钛磁铁矿矿石中铁的品位低、共伴生元素多且难利用,在高炉冶炼生铁过程产生大量高钛矿渣副产物,造成土地资源的大量浪费和空气、土壤的严重污染。研究采用高钛矿渣砂全部替代天然骨料制备超高性能混凝土,结果表明:高钛矿渣超高性能混凝土钢纤维和胶凝材料用量存在一个最佳值,钢纤维体积掺量为1.5%、胶凝材料用量为789kg/m^(3)时,力学性能达到最佳,抗压强度和抗折强度分别为158.6MPa和36.8MPa。

The iron in vanadium titanium magnetite ore in Panxi region of China has low quality,co-associated elements and is difficult to utilize.In the process of smelting pig iron in blast furnace,a large number of by-products of high titanium slag are produced,resulting in a large amount of waste of land resources and serious pollution of air and soil.In this study,high titanium slag sand was used to completely replace natural aggregate to prepare ultra-high performance concrete.The results showed that there was an optimal amount of steel fiber and cementitious material for high titanium slag ultra-high performance concrete.When the volume fraction of steel fiber was 1.5%and the cementitious material was 789kg/m^(3),the mechanical properties reached the best,with compressive strength and flexural strength of 158.6MPa and 36.8MPa,respectively.