Sathish Kumar V, Ganesan N, Indira P V
Faculty of Civil Engineering, Architecture and Geodesy, University of Split, 21000 Split, Croatia.
Department of Civil Engineering, National Institute of Technology Calicut, Kozhikode 673601, India.
Materials (Basel). 2021 Nov 3;14(21):6634. doi: 10.3390/ma14216634.
The need to promote sustainable civil infrastructure is one of the most important concerns in the construction industry. Geopolymer composites are one of the promising eco-friendly materials for the development of low carbon concrete. The main objective of this experimental investigation is to study the effect of hybrid fibres on the shear strength of flexural members made with ternary blend geopolymer concrete (TGPC). A total number of 27 reinforced concrete beams of size 100 mm × 150 mm × 1200 mm were cast and tested for shear. M55 grade of concrete was considered in this study. Crimped steel fibres and polypropylene fibres with an aspect ratio of 66 and 300, respectively, were used in this work. The main variables considered in this investigation involve two volume proportions of steel fibres, viz., 0.5% and 1% as well as four volume proportions of polypropylene fibres viz., 0.1%, 0.15%, 0.2% and 0.25%. The hybrid fibre-reinforced ternary blend geopolymer concrete (HTGPC) beams were compared with TGPC beams without fibres. From the test results, it was clear that incorporating hybrid fibres improved the shear strength and changed the type of failure of the beam from shear to flexure. Moreover, a method to predict the ultimate shear strength of HTGPC was proposed, and the estimated values were found to be the same as the test results.
推广可持续民用基础设施的需求是建筑行业最重要的关注点之一。地质聚合物复合材料是用于开发低碳混凝土的有前景的环保材料之一。本试验研究的主要目的是研究混杂纤维对三元混合地质聚合物混凝土（TGPC）制成的受弯构件抗剪强度的影响。共浇筑了27根尺寸为100毫米×150毫米×1200毫米的钢筋混凝土梁并进行抗剪试验。本研究采用M55级混凝土。本工作中分别使用了长径比为66和300的卷曲钢纤维和聚丙烯纤维。本研究中考虑的主要变量包括两种钢纤维体积比例，即0.5%和1%，以及四种聚丙烯纤维体积比例，即0.1%、0.15%、0.2%和0.25%。将混杂纤维增强三元混合地质聚合物混凝土（HTGPC）梁与无纤维的TGPC梁进行了比较。从试验结果可以明显看出，掺入混杂纤维提高了抗剪强度，并将梁的破坏类型从剪切破坏转变为弯曲破坏。此外，还提出了一种预测HTGPC极限抗剪强度的方法，发现估计值与试验结果相同。
