无砂混凝土在铁路工程中的应用研究

Application and Research of No-fines Concrete in Railway Project

无砂混凝土作为一种新型的功能型建筑材料,宏观大孔对其力学性能影响显著,与传统混凝土相比无砂混凝土在强度增长、复合纤维增强及经历荷载后的破坏形式等方面体现出更多的不确定性,其配合比设计、结构特点及力学特性更接近水泥稳定碎石基层及沥青混凝土。通过现场大量试拌,当水灰比0.30、浆体体积占总体积的30%左右时28 d抗压强度可满足C20等级的设计要求。

Non-fines concrete is a new functional material, and its mechanical properties are significantly af- fected by macro-large hole. Compared with traditional concrete, no-fines concrete shows more uncertainty in strength developing, fiber-reinforced composite and the damage form after loading. The mix design, structural features and mechanical properties of no-fines concrete are more similar to cement stabilized crushed stone base and the asphalt concrete. As demonstrated through mixing experiments on the site, when water/cement ratio is 0.30 and grout is about 30% the total volume, the 28 d compressive strength of the no-fines concrete can meet the design requirement of C20.