陈 歆,郑秀华,韩 凯.玄武岩纤维掺杂混凝土材料特性的研究[J].深圳大学学报理工版,2019,36(No.1(1-110)):61-66.[doi:10.3724/SP.J.1249.2019.01061]
CHEN Xin,ZHENG Xiuhua,and HAN Kai.Characterization of basalt fiber doped concrete materials[J].Journal of Shenzhen University Science and Engineering,2019,36(No.1(1-110)):61-66.[doi:10.3724/SP.J.1249.2019.01061]
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玄武岩纤维掺杂混凝土材料特性的研究
陈 歆1,郑秀华2,韩 凯3

1)苏交科集团股份有限公司在役长大桥梁安全与健康国家重点实验室,江苏南京 211112; 2)哈尔滨工业大学交通科学与 工程学院, 黑龙江哈尔滨,150090; 3)中设设计集团股份有限公司道桥新技术研究中心,江苏南京,210014

建筑材料; 混凝土; 玄武岩纤维; 抗折强度; 抗压强度; 氯离子渗透

Characterization of basalt fiber doped concrete materials
CHEN Xin1, ZHENG Xiuhua2, and HAN Kai3

1)State Key Laboratory of Safety and Health for In-service Long Span Bridges, JSTI Group Co.Ltd., Nanjing 211112, Jiangsu Province, P.R.China 2)School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, Heilongjiang Province, P.R.China 3)Research Center of New Technology on Roads and Bridges, China Design Group Co.Ltd., Nanjing 210014, Jiangsu Province, P.R.China

building materials; concrete; basalt fiber; flexural strength; compressive strength; chloride-ion penetration

DOI: 10.3724/SP.J.1249.2019.01061

备注

玄武岩纤维能有效改善混凝土材料的性能,但其对混凝土性能的影响规律业界还存在一定分歧. 以抗压和抗折强度作为力学指标,以抗氯离子渗透性能和早期收缩应变作为耐久性指标,探究不同玄武岩纤维掺量和规格对混凝土强度与耐久性的影响规律,分析短切玄武岩纤维掺杂混凝土材料的各项性能. 研究结果表明,短切玄武岩纤维对混凝土抗压强度的提高不明显,但对抗折强度则随掺量的增加提高显著; 纤维的体积分数为0.12%时,混凝土抗折强度提高约25%; 长度较长及长径比较大的玄武岩纤维对混凝土抗折强度有更好的提高效果.玄武岩纤维的掺入会使混凝土抗渗性能略有下降,但也能有效降低混凝土的收缩应变,掺入玄武岩纤维后,混凝土28 d收缩应变降低约15%.

Basalt fiber can effectively improve property of concrete material. However, there are some divergences for its effects on concrete property. Therefore, in this paper, the effects of various fiber contents and sizes on concrete strength and durability are investigated, and properties of chopped basalt fiber doped concrete materials are characterized. In the research, compressive strength and flexural strength are used as mechanical indexes, while resistance to chloride-ion penetration and early-age shrinkage are used as durability indexes. Results show that although the contribution of short-cut basalt fiber to compressive strength of concrete is not obvious, flexural strength of concrete increases significantly with the increase of the fiber content. When the volume fraction of basalt fiber reaches 0.12%, the flexural sstrength of concrete increases by about 25%. The basalt fiber with longer length and larger length/diameter ratio has better effect on the flexural strength of concrete. The addition of basalt fiber will make the concrete coagulate, thus the impermeability of concrete decreases slightly, but it can effectively reduce the shrinkage strain of concrete. By adding basalt fiber, shrinkage strain of concrete decreases by about 15% in 28 days.

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