高性能机制砂水泥混凝土性能的试验研究

发布时间：2018-05-22 07:11

本文选题：机制砂 + 配合比　；参考：《重庆交通大学》2015年硕士论文

【摘要】：本文通过机制砂混凝土的配置和性能测试,主要研究了水胶比、砂率和机制砂与海砂比例以及石粉含量对机制砂混凝土工作性、抗压强度、抗折强度、劈裂抗拉强度、抗冲击性、耐磨性、抗冻性等性能的影响规律,得出相关结论如下：①机制砂混凝土的工作性能测试了不同水胶比、砂率和机制砂与海砂比例的机制砂混凝土坍落度、粘聚性、保水性等工作性能评价指标。结果表明,机制砂取代率的提高对机制砂水泥混凝土的和易性有一定程度的提高；一定范围内砂率增加也能提高机制砂混凝土和易性；水胶比对混凝土的工作性能有较大影响,水胶比越大其拌和性能越好。②机制砂混凝土的力学性能(1)机制砂混凝土抗压强度、抗折强度、劈裂抗拉强度随着水胶比的增大而减小；(2)机制砂混凝土的抗压抗折强度随着砂率的增加呈先增大后减小的趋势,不过变化幅度很小；而机制砂混凝土的劈裂抗拉强度却随着砂率的增大而一直增大；(3)随着机制砂与海砂比例的提高,机制砂混凝土的抗压强度逐渐上升,机制砂水泥混凝土抗折强度和劈裂抗拉强度随机制砂含量增加有少量提升。(4)在试验掺量范围内,石粉能一定程度提高机制砂混凝土的力学性能,在提高石粉掺量的过程中,机制砂混凝土抗压强度和劈裂抗拉强度都会先增大后减小.③机制砂混凝土的耐久性能(1)水胶比对机制砂混凝土的抗冲击性能影响较大,随着水胶比的增加机制砂混凝土的抗冲击性能逐渐下降；而砂率、机制砂与海砂比例对机制砂混凝土的抗冲击性能影响并不明显。(2)水胶比对机制砂混凝土的抗冻性的影响是最大的,随着水胶比的增加,机制砂混凝土的抗冻性逐渐降低；砂率、机制砂与海砂比例对机制砂混凝土的抗冻性影响并不明显。(3)随着水胶比的增加,机制砂混凝土的耐磨性逐渐降低且降幅较大；随着砂率的增加机制砂混凝土的耐磨性逐渐降低；机制砂在混合砂中所占比例越大,混凝土的耐磨性越好,说明机制砂能更好的提高混凝土的耐磨性。④机制砂在工程中的实际应用通过机制砂在那坡大桥修复加固工程上实际应用研究,探究了机制砂混凝土预应力T梁外观、梁体强度以及预应力损失规律,发现机制砂配制的混凝土所成型T梁外观以及强度都能满足设计要求；并且机制砂混凝土梁中预应力筋的起始预应力和最终剩余预应力值都比河砂混凝土梁中相应位置处的值要大,从而表明机制砂更适宜于应用在预应力梁等工程构件中。
[Abstract]:Through the configuration and performance test of mechanism sand concrete, this paper mainly studies the influence of water to rubber ratio, sand ratio and mechanism sand and sea sand proportion and stone powder content on the workability of mechanism sand concrete, compressive strength, flexural strength, splitting tensile strength, impact resistance, wear resistance, frost resistance and so on. The following conclusions are drawn as follows: 1 machine The working performance of sand concrete has been tested with different water glue ratio, sand ratio and mechanism sand and sea sand proportion of sand concrete slump, cohesiveness, water retention and other performance evaluation indexes. The results show that the increase of mechanism sand substitution rate has a certain degree of improvement on the workability of mechanism sand cement concrete; the sand rate increases in a certain range. It can also improve the mechanism sand concrete and the workability; water glue ratio has great influence on the performance of concrete. The better the mixing performance is, the better the mixing performance of the concrete. (1) the mechanical properties of the mechanism sand concrete, the compressive strength of the mechanism sand concrete, the flexural strength and the splitting tensile strength decrease with the increase of the water glue ratio; (2) the compression strength of the mechanism sand concrete The flexural strength increases first and then decreases with the increase of sand rate, but the variation is very small, but the splitting tensile strength of mechanism sand concrete increases with the increase of sand ratio. (3) the compressive strength of mechanism sand concrete increases with the increase of the ratio of mechanism sand and sea sand, and the strength of mechanism sand cement concrete is strong. There is a little increase in the increase of random sand content of the degree and splitting tensile strength. (4) in the range of test admixture, the stone powder can improve the mechanical properties of the mechanism sand concrete to a certain extent. In the process of increasing the amount of stone powder, the compressive strength and splitting tensile strength of the mechanism sand concrete will increase first and then decrease. (1) water glue ratio has a great influence on the impact resistance of the mechanism sand concrete. With the increase of water glue ratio, the impact resistance of sand concrete gradually decreases, and the sand ratio and the ratio of sand and sea sand have no obvious effect on the impact resistance of the mechanism sand concrete. (2) the effect of water glue ratio on the frost resistance of mechanism sand concrete is the greatest. With the increase of water glue ratio, the frost resistance of mechanism sand concrete is gradually reduced; sand ratio, mechanism sand and sea sand ratio have no obvious effect on the frost resistance of mechanism sand concrete. (3) with the increase of water glue ratio, the wear resistance of mechanism sand concrete is gradually reduced and greatly reduced; with the increase of sand rate, the wear resistance of sand concrete is gradually increased. The greater the proportion of the mechanism sand in the mixed sand, the better the wear resistance of the concrete, the better the abrasion resistance of the concrete. (4) the practical application of mechanism sand in the engineering of the bridge is applied to the practical application of the mechanism sand in the repair and reinforcement project of the bridge, and the appearance of the prestressed T beam of the mechanism sand concrete and the beam body are explored. It is found that the appearance and strength of the T beam formed by the mechanism sand prepared by the mechanism sand can meet the design requirements, and the initial prestress and the final residual prestress value of the prestressing tendons in the mechanism sand concrete beams are larger than those in the corresponding positions in the sand concrete beams, which indicates that the mechanism sand is more suitable. It is used in engineering components such as prestressed beams.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528

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