抗裂混凝土及其在水工面板加固工程中的应用

发布时间：2018-04-12 00:01

本文选题：钒铁渣 + 补偿收缩　；参考：《南昌大学》2014年硕士论文

【摘要】：论文在已有研究的基础上，测定并分析了钒铁渣的化学及矿物组成，通过实验研究了钒铁渣的体积安定性、水化活性，以及钒铁渣对混凝土力学性质和抗裂性能的影响规律。根据实验室以及理论研究结果，进行了抗裂混凝土在面板加固工程中的应用研究。研究结果表明：（1）钒铁渣主要矿物组成为γ-2CaO·SiO2及少量的α-2CaO·SiO2和MgO；其3d、28d、60d水化活性指数分别为0.82、0.78、0.77，具有水化活性，且其安定性合格，放射性比活度符合有关标准要求，可以作为水泥和混凝土的掺合料。（2）钒铁渣作为水泥基材料的掺合料，有明显的补偿收缩和提高抗裂性作用。单掺粉煤灰、复掺钒铁渣和粉煤灰混凝土的压拉强度比（抗压强度/劈拉强度）均高于纯水泥混凝土，，尤其以复掺钒铁渣和粉煤灰混凝土更优。将其应用于混凝土面板中，能够抑制收缩，减少裂缝，从而提高混凝土结构的耐久性。（3）综合考虑抗压强度和抗裂性等性能，钒铁渣掺量范围为15%~20%，水泥基材料具有较好的力学性能及抗裂性。（4）复掺20%钒铁渣和10%粉煤灰取代水泥掺入混凝土，在两个面板加固工程中应用效果良好，可以用于配置抗裂面板混凝土。利用钒铁渣部分取代水泥，既能改善水泥基材料的性能，又能更高效地利用工业固体废弃物，达到节省资源和保护环境的目的。
[Abstract]:Based on the previous research, the chemical and mineral composition of ferrovanadium slag is measured and analyzed. The volume stability, hydration activity and the effect of ferrovanadium slag on the mechanical properties and crack resistance of concrete are studied by experiments.According to the results of laboratory and theoretical research, the application of crack-resistant concrete in slab reinforcement is studied.The results show that:The main mineral composition of ferrovanadium slag is 纬 -2CaO SiO2 and a small amount of 伪 -2CaO SiO2 and MgO.The hydration activity index of ferrovanadium slag is 0.82O0.780.77 in 60 days after 3 days, and its stability is qualified. The activity of radioactivity can be used as admixture of cement and concrete.(2) Ferrovanadium slag as admixture of cement material has obvious effect on compensating shrinkage and improving crack resistance.The compressive tensile strength ratio (compressive strength / split tensile strength) of concrete mixed with fly ash, mixed with ferrovanadium slag and fly ash is higher than that of pure cement concrete, especially the concrete with compound ferrovanadium slag and fly ash is better than pure cement concrete.Applying it to concrete slabs can restrain shrinkage and reduce cracks, thus improving the durability of concrete structures.(3) considering the compressive strength and crack resistance, the content of ferrovanadium slag is 15% and 20%. The cement based material has better mechanical properties and crack resistance.In addition, 20% ferrovanadium slag and 10% fly ash are added to the concrete instead of cement, which can be used in the reinforcement of two slabs.The partial replacement of cement with ferrovanadium slag can not only improve the performance of cement-based materials, but also make use of industrial solid waste more efficiently, thus saving resources and protecting the environment.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV431

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