Abstract In order to solve the problem of insufficient durability and long-term performance of concrete, the compressive and splitting properties of nano-silicon dioxide modified concrete are analyzed in this study, which provides strong evidence for the synergistic interaction between nano-silicon dioxide modified concrete, fly ash and mineral powder and the improvement of durability. Firstly, ordinary concrete and high-performance concrete are modified and mixed. Then, they are separately mixed with nano-silicon dioxide. Nano-silicon dioxide is mixed with fly ash, and nano-silicon dioxide is mixed with mineral dust. Compressive strength and splitting tensile strength of modified concrete are tested and compared, and mechanical properties of modified concrete are analyzed. The results show that the synergistic effect of nano-silicon dioxide, fly ash and mineral powder on the strength of concrete is remarkable. The maximum increment of compressive strength of modified ordinary concrete is 10Mpa, and that of synergistic modified high-strength concrete is 20 MPa. In addition, a small amount of nano-silicon dioxide can improve the splitting tensile strength of ordinary concrete, but it has no obvious effect on the splitting tensile strength of high-strength concrete. Therefore, the problem of insufficient durability and long-term performance of concrete can be solved to some extent by adding nano-silicon dioxide in concrete according to reasonable proportion.

中文翻译：

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纳米二氧化硅改性混凝土的力学性能

摘要 为了解决混凝土耐久性和长期性能不足的问题，本研究对纳米二氧化硅改性混凝土的抗压和劈裂性能进行了分析，为纳米二氧化硅改性之间的协同作用提供了有力的证据。混凝土、粉煤灰和矿粉以及提高耐久性。首先对普通混凝土和高性能混凝土进行改性和混合。然后，它们分别与纳米二氧化硅混合。纳米二氧化硅与粉煤灰混合，纳米二氧化硅与矿物粉尘混合。测试比较了改性混凝土的抗压强度和劈裂抗拉强度，分析了改性混凝土的力学性能。结果表明，纳米二氧化硅的协同作用，粉煤灰和矿粉对混凝土强度的影响是显着的。改性普通混凝土抗压强度最大增量为10Mpa，增效改性高强混凝土抗压强度最大增量为20MPa。此外，少量纳米二氧化硅可提高普通混凝土的劈裂抗拉强度，但对高强混凝土的劈裂抗拉强度无明显影响。因此，在混凝土中按合理比例添加纳米二氧化硅，可以在一定程度上解决混凝土耐久性和长期性能不足的问题。少量纳米二氧化硅可提高普通混凝土的劈裂抗拉强度，但对高强混凝土的劈裂抗拉强度无明显影响。因此，在混凝土中按合理比例添加纳米二氧化硅，可以在一定程度上解决混凝土耐久性和长期性能不足的问题。少量纳米二氧化硅可提高普通混凝土的劈裂抗拉强度，但对高强混凝土的劈裂抗拉强度无明显影响。因此，在混凝土中按合理比例添加纳米二氧化硅，可以在一定程度上解决混凝土耐久性和长期性能不足的问题。