尾矿砂高性能混凝土力学性能的研究

STUDY ON MECHANICAL PROPERTIES OF HIGH PERFORMANCE CONCRETE ADDED WITH IRON TAILING ORE

为研究不同岩质机制砂片状颗粒、水胶比、石粉含量对混凝土力学性能的影响,文中以凝灰岩和石灰岩作为研究对象,采用室内试验方法,对比分析不同水胶比、片状含量、石粉含量对混凝土抗压、抗折强度、流动度、坍落度的影响。研究结果表明,片状颗粒使拌合物粘滞力增大,流变性能变差,坍落度降低;随着片状颗粒的增加,砂浆的抗折与抗压强度不断下降;0.45与0.5两种不同的水胶比相比,水胶比为0.45具有更高的强度;在石粉掺量为10%与12%时对混凝土3d、7d、28d强度的影响最大,混凝土强度值达到最大。因此,适当的配合比对机制砂的应用起到关键作用。研究成果可为铁尾矿资源的推广应用提供一定理论支撑。

In order to study the effects of sand flake particles with different rock mechanism, water binder ratio,and stone powder content on the mechanical properties of concrete, this paper takes tuff and limestone as the research object, and uses the indoor testing method to compare and analyze the effects of different water binder ratio, flake content, and stone powder content on the compressive strength, flexural strength, fluidity, and slump of concrete. The results show that flake particles increase the viscosity, deteriorate the rheological properties and reduce the slump of the mixture. With the increase of flake particles, the flexural and compressive strength of mortar decreases continuously. Compared with two different water binder ratios of 0.45 and 0.5, the one with water binder ratio of 0.45 has the higher strength.When the content of stone powder is 10% and 12%, it has the greatest impact on the 3 d, 7 d, and 28 d strength of concrete, and the concrete strength reaches the maximum. Therefore, the proper mix ratio plays a key role in the application of machine-made sand. The research results can provide some theoretical support for the popularization and application of iron tailings resources.