Experimental investigation on the mechanical and fracture evaluation of carbon Fiber-Reinforced cementitious composites with Nano-Calcium carbonate

被引:30
作者
Ali, Liaqat [1 ]
El Ouni, Mohamed Hechmi [2 ,3 ]
Raza, Ali [4 ]
Janjua, Shahmir [5 ]
Ahmad, Zeeshan [4 ]
Ali, Babar [6 ]
Ben Kahla, Nabil [2 ,3 ]
Bai, Yong [1 ]
机构
[1] Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China
[2] King Khalid Univ, Coll Engn, Dept Civil Engn, POB 394, Abha 61411, Saudi Arabia
[3] Univ Carthage, Tunisia Polytech Sch, Appl Mech & Syst Res Lab, Tunis 2078, Tunisia
[4] Univ Engn & Technol Taxila, Dept Civil Engn, Taxila 47050, Punjab, Pakistan
[5] Capital Univ Sci & Technol, Dept Civil Engn, Islamabad 46000, Pakistan
[6] COMSATS Univ Islamabad, Dept Civil Engn, Sahiwal Campus, Sahiwal 57000, Pakistan
关键词
Micro carbon fibers; Geopolymer; Nano calcium carbonate; Compressive strength; Flexural strength; SEM analysis; COMPACTING GEOPOLYMER CONCRETE; FLY-ASH; COMPRESSIVE STRENGTH; MIXING METHODS; SILICA; STEEL;
D O I
10.1016/j.conbuildmat.2021.125095
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Geopolymer (GPM) cementitious composites can be efficiently employed as a practical substitute for cement to avoid the high carbon footprint and to develop sustainable concrete construction. Limited research is available in the previous studies that examine the efficiency of GPM composites including micro-fibers and nano-particles. Therefore, it is necessary to investigate the efficiency of fiber-reinforced (FR) GPM composites comprising nano-particles for their practical implementations towards environmental sustainability. The present investigation has struggled to improve the mechanical and microstructural efficiency of micro carbon-FR fly ash-based GPM mixes by incorporation of different quantities of nano calcium carbonate (n-calcium carbonate). Four different extents of n-calcium carbonate i.e. 1%, 2%, 3%, and 4% wt. % of the mix was used to fabricate GPM mixes comprising a fixed extent of micro carbon fibers (i.e. 1% wt. %). A control mix with 1% micro carbon fibers having no extent of n-calcium carbonate was also fabricated for comparison purposes. The average results of six samples from each mix were used to assess various mechanical and fracture features of GPM mixes. The microstructural analysis was also performed on the tested samples employing scanning electron microscopy. The outcomes of the present investigation exhibited that the use of 3% n-calcium carbonate in carbon-FR-GPM mix portrayed the optimum results for hardness and compressive strength whereas employing 2% n-calcium carbonate delineated the optimum results for flexural strength, fracture toughness, and impact strength of composites. The SEM analysis of samples illustrated that including n-calcium carbonate considerably accelerates and ameliorates the microstructure of GPM.
引用
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页数:12
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