Performance of Autoclaved Concrete with Iron Tailings
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摘要:
这是一篇陶瓷及复合材料领域的论文。将铁尾矿替换河砂来制备蒸压混凝土，分析了水泥用量、粉煤灰用量、铁尾矿砂掺量和减水剂用量对蒸压混凝土流动性和抗压强度的影响。将混凝土进行蒸压养护处理，分析不同蒸压时间作用下混凝土的水化机理。结果表明：综合考虑经济性和试样抗压强度，选择水泥用量为551 kg/m3、铁尾矿砂掺量为20%、粉煤灰用量为225 kg/m3和减水剂掺量为0.20%，在上述综合指标作用下，测定混凝土的抗压强度为61.13 MPa。蒸压时间长更能激发铁尾矿砂内部矿物成分的活性，使得混凝土内部的水化反应更彻底，生成的晶体、凝胶的含量也越多，这有效提高混凝土的强度。
Abstract:This is an essay in the field of ceramics and composites. The iron tailings are replaced with river sand to prepare autoclaved concrete. The influence of cement dosage, fly ash dosage, iron tailing sand dosage and water reducing agent dosage on the fluidity and compressive strength of autoclaved concrete is analyzed. The concrete is autoclaved and cured. The hydration mechanism of concrete under different autoclave time is analyzed. The results show that considering economy and sample strength, as cement dosage of 551 kg/m3, iron tailing sand dosage of 20%, fly ash dosage of 225 kg/m3 and water reducing agent dosage of 0.20% is selected. Under the action of the above comprehensive indicators, the compressive strength of concrete is determined to be 61.13 MPa. The longer the autoclave time is, the more active the mineral components in the iron tailings will be stimulated, and the hydration reaction inside the concrete will be more thorough. The more crystals and gels are formed, which effectively improves the strength of concrete.
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