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Reactive Powder Concrete Containing Basalt Fibers: Strength Abrasion and Porosity

机译：含有玄武岩纤维的反应性粉末混凝土：强度磨损和孔隙率

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The paper presents the test results of basalt fiber impact on a compressive and flexural strength, resistance to abrasion and porosity of Reactive Powder Concrete (RPC). The reasons for testing were interesting mechanical properties of basalt fibers, the significant tensile strength and flexural strength, and in particular the resistance to high temperatures, as well as a relatively small number of RPC tests performed with those fibers and different opinions regarding the impact of those fibers on concrete strength. The composition of the concrete mix was optimized to obtain the highest packing density of particles in the composite, based on the optimum particle size distribution curve acc. to Funk. Admixture of basalt fibers was used in quantity 2, 3, 6, 8 and 10 kg/m , length 12 mm and diameter 18 µm. A low water-to-binder ratio, i.e., from 0.24, was obtained through application of a polycarboxylate-based superplasticizer. The introduction of up to 10 kg/m of basalt fibers to RPC mix was proved to be possible, while keeping the same w/c ratio equal to 0.24, with a slight loss of workability of the concrete mix as the content of fibers increased. It was found that the increase of the fiber content in RPC to 10 kg/m , despite the w/c ratio was kept the same, caused reduction of the concrete compressive strength by 18.2%, 7.8% and 13.6%, after 2, 7, and 28 days respectively. Whereas, the flexural strength of RPC increased gradually (maximum by 15.9%), along with the fiber quantity increase up to 6 kg/m , and then it reduced (maximum by 17.7%), as the fiber content in the concrete was further increased. The reduction of RPC compressive strength, along with the increase in basalt fibers content, leads to the increase of the total porosity, as well as the change in pore volume distribution. The reduction of RPC abrasion resistance was demonstrated along with the increase of basalt fibers content, which was explained by the compressive strength reduction of that concrete. A linear relation between the RPC abrasion resistance and the compressive strength involves a high determination coefficient equal to 0.97.
机译：本文介绍了玄武岩纤维对压缩和弯曲强度的影响，耐磨损和反应性粉末混凝土（RPC）的耐腐蚀性。测试的原因是玄武岩纤维的有趣机械性能，显着的拉伸强度和弯曲强度，特别是对高温的耐药性，以及对这些纤维进行的相对少量的RPC测试以及关于影响的不同意见那些混凝土强度的纤维。基于最佳粒度分布曲线ACC，优化了混凝土混合物的组成以获得复合材料中颗粒的最高填充密度。放克。玄武岩纤维的混合物用于量2,3,6,8和10kg / m，长度为12mm和直径18μm。通过施加基于聚羧酸盐的高效化剂，获得低水位粘合剂比例，即0.24。证明了最多10kg / m的玄武岩纤维的引入可以实现，同时保持与0.24等于0.24的相同的相同的比率，随着纤维含量的增加，混凝土混合的可加工性轻微丧失。结果发现，RPC至10kg / m中的纤维含量的增加，尽管W / C的比率保持相同，但在2,7后引起混凝土抗压强度的降低18.2％，7.8％和13.6％和28天分别。然而，RPC的抗弯强度逐渐增加（最多15.9％），纤维量增加高达6千克/米，然后减少（最大17.7％），因为混凝土中的纤维含量进一步增加。 RPC抗压强度的降低以及玄武岩纤维含量的增加，导致总孔隙率的增加，以及孔体积分布的变化。随着玄武岩纤维含量的增加，证明了RPC耐磨性的降低，这是通过该混凝土的抗压强度减小来解释的。 RPC耐磨性和抗压强度之间的线性关系涉及等于0.97的高测定系数。

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