泥石流防治工程混凝土材料的抗冲磨性能

目的] 开展在混凝土中复掺纳米二氧化硅、微硅粉、聚丙烯纤维等材料，增强工程耐磨性的试验研究，探讨复掺材料掺量变化影响抗冲磨强度的规律，旨在为泥石流防护工程建设中抗冲磨混凝土的配合比设计提供科学参考。方法] 采用正交试验设计的水下钢球法对混凝土试件进行水下冲磨试验，得出了复掺纳米二氧化硅、微硅粉、聚丙烯纤维的混凝土试件的抗冲磨强度。结果] 在选定的掺量范围内，混凝土试件的抗冲磨强度随纳米二氧化硅的增加先增大再减小，在掺量为1.5%时达到最大值；随微硅粉的增加而增大，在掺量为12%时达到最大值；随聚丙烯纤维的增加先减小再增大，在掺量为1.8 kg/m³时达到最大值；随着引气剂的增加先减小再增大，在掺量为0.005%时达到最大值。结论] 影响混凝土抗冲磨性能最为显著的因素是纳米二氧化硅掺量，其次是聚丙烯纤维，再次是微硅粉，最后是引气剂。

Properties of Abrasion Resistance of Concrete for Debris Flow Mitigation Engineering

Objective] Experiments on strengthening the abrasion resistance of mitigation engineering by mixing nano silica, micro silica powder, polypropylene fiber and other materials with concrete were carried out to discuss the laws of the influence of the mixing material content on the abrasion resistance, in order to provide scientific reference for the mix design of abrasion resistance of concrete in the debris flow mitigation engineering. Methods] The underwater abrasive test of concrete specimens was carried out by using the underwater steel ball method (SL352-2006) designed by orthogonal experimental design method, and the abrasive resistance strength of concrete mixed with nano silica, micro silica and polypropylene fiber was obtained. Results] Within the range of selected content, the abrasion resistance strength of concrete specimens increased first and then decreased with the raise of Nano-SiO₂, and reached the maximum value when the content was 1.5%. With the increase of microsilica powder, the maximum value was reached when the content was 12%. With the increase of polypropylene fiber, it decreased at first, and then increased, and the maximum value was reached when the content was 1.8 kg/m³. With the increase of air entraining agent, it first decreased and then increased, and reached the maximum value when the dosage was 0.005%. Conclusion] The most significant factor affecting the abrasion resistance strength of concrete is the content of nano silica, followed by polypropylene fiber, micro silica and air entraining agent.