Study on the Mechanical Properties and Microstructure of Concrete with Ultra-Lean Iron Ore
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摘要:
这是一篇陶瓷及复合材料领域的论文。对超贫铁矿石进行加工处理，将良好级配的超贫铁矿石作为骨料，制备新型的蒸压加气混凝土砌块，进而研究不同骨料的掺量、水灰比和蒸压时间对蒸压加气混凝土性能以及微观结构的影响。结果表明：随着水灰比，石灰掺量、骨料取代率和蒸压时间的增大，混凝土的抗压强度均呈现先增大、后减小的趋势；超贫铁矿石骨料的取代率为40%，粉煤灰掺量为10%、石灰掺量为18%、水泥掺量为60%，水灰比为0.45和蒸压时间为5 h时，混凝土的性能达到较佳。同时，超贫铁矿石的掺入对新物相的产生和混凝土自身以及孔隙结构具有较大的影响。
Abstract:This is a paper in the field of ceramics and composites. Ultra-lean iron ore was processed, and the ultra-lean iron ore with a good gradation was used as aggregate to prepare a new type of autoclaved aerated concrete block. Furthermore, the effects of different aggregate content, water-cement ratio and autoclave time on the performance and microstructure of autoclaved aerated concrete were studied. The results showed that with the increase of water-cement ratio, lime content, aggregate replacement rate and autoclave time, the compressive strength of concrete showed a trend of first increasing and then decreasing. When the replacement rate of ultra-lean iron ore aggregate was 40%, the amount of fly ash was 10%, the amount of lime was 18%, the amount of cement was 60%, the water-cement ratio was 0.45 and the autoclave time was 5h,the performance of concrete was at its best. At the same time, the incorporation of ultra-lean iron ore had a great impact on the generation of new phases, the concrete itself and the pore structure.
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