高ZrO_2含量耐碱玻璃纤维在海鸥栏片中的应用研究

Study on the Application of High ZrO_2 Content of Alkali-resistant Glass Fiber in Seagulls-bar

纤维的掺入可保证小截面栏片细石混凝土的完整性和抗裂性,而聚丙烯腈纤维弹性模量低、后期抗裂性差,易产生较多裂纹,高ZrO_2含量耐碱玻璃纤维却能弥补此缺陷,相近的弹模保证了其与混凝土协同作用效果。利用12HD、18HP和36HP三种不同规格和性能的高ZrO_2含量耐碱玻璃纤维,建立了三种不同双掺组合方案,通过三种方案对混凝土性能影响程度的对比择优选取了12HD+36HP组合方案;同时,也与现在应用的聚丙烯腈纤维进行了比较,表明高ZrO_2含量耐碱玻璃纤维在抗压强度、劈裂抗拉强度、拌和性能、电通量、工作性等方面具有一定优越性,为其以后在铁路混凝土中的应用铺平了道路。

The fiber can ensure the integrity and crack resistance of small section bar fine aggregate concrete. However, polyacrylonitrile fiber is a low elastic modulus and the crack resistance is poor, so it is easy to produce more cracks. The high ZrO2 content of alkali-resistant glass fiber has similar elastic modulus, thus ensuring its synergistic effect with con- crete, and making up for the defect. Three different mixing schemes are established, using of 12HD, 18HP and 36HP three kinds of the high ZrO2 content of alkali-resistant glass fiber. By comparing the mixing performance of concrete, the 12HD ＋ 36HP combination scheme is selected finally. At the same time, the high ZrO2 content of alkali-resistant glass fiber is compared to the polyacrylonitrile fiber, the research shows that the former has certain superiorities on the compressive strength, splitting tensile strength, mixing performance, electric flux, and the workability. This paves the way for the future application of railway concrete.