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工程科学与技术:2022,54(6):230-237
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纤维地聚物混凝土断裂性能试验
(西南交通大学 土木工程学院,四川 成都 610031)
Experiment of Fracture Performance of Fiber Reinforced Geopolymer Concrete
(School of Civil Eng., Southwest Jiaotong Univ., Chengdu 610031, China)
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投稿时间:2021-07-14    修订日期:2021-11-02
中文摘要: 为研究不同性质的纤维对粉煤灰基地聚物混凝土(GPC)断裂性能的影响,通过切口梁的3点弯曲试验,探讨不同体积率的玄武岩纤维(BF)、聚乙烯基聚丙烯纤维(SPPF)及端勾钢纤维(SF)对GPC断裂性能的影响。结果表明:1) BF增强GPC(BFGPC)、SPPF增强GPC(SPPFGPC)和SF增强GPC(SFGPC)较GPC(对照组)的抗压强度和劈裂抗拉强度均有显著提高,最大抗压强度分别在体积率为0.2%、0.8%和1.0%获得,劈裂抗拉强度对应的最佳体积率分别为0.2%、0.4%和1.0%。2) BFGPC的各断裂性能指标均随BF体积率的增加先增大后减小;体积率为0.2%时,BFGPC的起裂韧度$K_{\!\!{\text{Ⅰ}}\!\!{\rm{C}}}^{\text{ini}}$、失稳韧度$K_{\!\!{\text{Ⅰ}}\!\!{\rm{C}}}^{{\text{un}}}$、等效裂缝长度ae和断裂能GF的增益比最大;BFGPC是以BF拉断为主要特征的脆性破坏。3) 在低掺量范围内,SPPFGPC的各断裂性能指标随纤维体积率增加而增大;在高掺量范围内,SPPFGPC的各断裂性能指标先增大后减小,并在SPPF的体积率为1.5%时有最大增益比;SPPFGPC以SPPF脱黏和拔出的形式失效。4) 随着SF体积率的增加,SFGPC的各断裂力学参数和断裂能逐渐增大,SFGPC具有显著的延性破坏特征;建议采用的体积率为0.5%~1.5%。5) 在GPC体系中,SF的增强、增韧效果最好,BF的增强效果胜于SPPF,但SPPF的增韧效果可能优于BF。
Abstract:To study the influence of various fibers on the fracture behavior of fly ash based geopolymer concrete (GPC), the three-point bending test of the notched concrete beam was carried out. The effects of the volume fraction of basalt fiber (BF), polyethylene-based polypropylene fiber (SPPF), and end steel fiber (SF) on the fracture properties of GPC were investigated, respectively. The results showed that: 1) The compressive strength and splitting tensile strength of BFGPC, SPPFGPC, and SFGPC were significantly improved compared with GPC. The maximum compressive strength was obtained at the volume rate of 0.2%BF, 0.8%SPPF, and 1.0%SF, respectively. The optimal volume rate corresponding to the splitting tensile strength was 0.2%BF, 0.4%SPPF, and 1.0%SF, respectively. 2) The fracture parameters of BFGPC first increased and then decreased with the increase of BF volume ratio, and the optimum dosage was 0.2%. Nonetheless, BFGPC exhibited brittle fracture characterized by BF tensile fracture. 3) In the low dosage range, the fracture parameters of SPPFGPC increased with the increase of fiber volume rate; In the high dosage range, the fracture parameters of SPPFGPC first increased and then decreased, and the optimal dosage was 1.5%; SPPFGPC failed with debonding and pull-out of SPPF. 4) As the volume ratio of SF increases, the fracture mechanical parameters and fracture energy of SFGPC gradually increased. SFGPC had significant ductile failure characteristics, and the recommended volume ratio of SFGPC was 0.5%~1.5%. 5) In the GPC system, SF enhancement and toughening effect are the best, BF enhancement is better than that of SPPF, but SPPF toughening is better than that of BF.
文章编号:202100691     中图分类号:TU52    文献标志码:
基金项目:国家自然科学基金项目(51778531)
作者简介:第一作者:杨世玉(1989-),男,博士生.研究方向:混凝土材料和混凝土结构长期性能.E-mail:shyyang@my.swjtu.edu.cn;通信作者:赵人达,教授,E-mail:rendazhao@swjtu.edu.cn
引用文本:
杨世玉,赵人达,郭秋雨,曾宪帅.纤维地聚物混凝土断裂性能试验[J].工程科学与技术,2022,54(6):230-237.
YANG Shiyu,ZHAO Renda,GUO Qiuyu,ZENG Xianshuai.Experiment of Fracture Performance of Fiber Reinforced Geopolymer Concrete[J].Advanced Engineering Sciences,2022,54(6):230-237.