玄武岩纤维混凝土氯盐侵蚀行为及力学性能试验研究
Experimental study on corrosion behavior and mechanical properties of basalt fiber concrete by chlorine attack
Received:October 16, 2019  Revised:February 04, 2020
DOI:10.7520/1001-4888-19-189
中文关键词:  玄武岩纤维混凝土  氯盐侵蚀  耐久性  力学性能
英文关键词:basalt fiber concrete  chloride erosion  durability  mechanical properties
基金项目:国家自然科学基金 (51608441)
Author NameAffiliation
WANG Zhenshan School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, Shaanxi, China 
LI Yakun School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, Shaanxi, China 
WEI Jun* School of civil engineering, Suzhou University of Science and Technology, Suzhou 215009, Jiangsu, China 
LU Junlong School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, Shaanxi, China 
GUO Hongchao School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, Shaanxi, China 
TIAN Jianbo School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an 710048, Shaanxi, China 
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中文摘要:
      玄武岩纤维混凝土在我国工程领域应用越来越广,本文为研究其在氯盐环境下的耐腐蚀性及力学性能的退化,共设计10种配合比,置于浓度5%的氯化钠溶液中进行腐蚀试验。试块尺寸为100mm×100mm×100mm,每30d测定表观裂缝、有效孔隙率、吸水率及质量等;每90d进行材料强度试验,对受压性能变化进行研究。结果发现:玄武岩纤维可有效抑制氯盐侵蚀裂缝的产生和发展,降低氯离子迁移速率。与普通混凝土相比,添加适量的玄武岩纤维能较好提升混凝土抗压强度及变形能力,当纤维体积掺量为0.1%时,最为有利;当掺量超过0.2%后,性能反而降低。另外发现,添加粉煤灰在降低玄武岩纤维混凝土的有效孔隙率、减缓氯离子迁移等方面并不理想。氯盐侵蚀环境下,建议玄武岩混凝土保护层厚度不宜低于30mm。最后,基于试验结果,提出了玄武岩纤维混凝土氯盐侵蚀强度退化模型。本文研究结果可为玄武岩纤维混凝土在氯盐环境下的工程应用提供一定技术支持。
英文摘要:
      Basalt fiber concrete has been widely used in the engineering field in our country. In order to study its corrosion resistance and mechanical property degradation in chloride environment, 10 kinds of mix proportion are designed and tested in 5% NaCl solution. The size of the test block is 100mm×100mm×100mm. The apparent cracks, effective porosity, water absorption and mass of the block are measured every 30 days; the axial compressive strength test is conducted every 90 days to determine the change of mechanical properties. It is found that the addition of basalt fiber can effectively inhibit the generation and development of concrete cracks and reduce the migration rate of chloride ions. Compared with the ordinary concrete, adding proper amount of basalt fiber can better improve the compressive strength and deformation ability of concrete. When the volume fraction of fiber is 0.1%, it is the most favorable, while when the parameter is more than 0.2%, the performance is reduced. In addition, it is found that the addition of fly ash is not ideal to reduce the effective porosity of basalt fiber concrete and slow down the migration of chloride ions. It is suggested that the thickness of basalt concrete protective layer should not be less than 30mm in chloride corrosion environment. Finally, on the basis of experiments, the strength degradation model of basalt fiber concrete under chloride erosion is proposed. This study will provide some technical support for the application of basalt fiber concrete in chloride environment.
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