A novel corrosion resistant repair technique for existing reinforced concrete (RC) elements using polyvinyl alcohol fibre reinforced geopolymer concrete (PVAFRGC)
A novel corrosion resistant repair technique for existing reinforced concrete (RC) elements using polyvinyl alcohol fibre reinforced geopolymer concrete (PVAFRGC)
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DOI：
10.1016/j.conbuildmat.2017.12.213
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发表时间：
2018-03-10
影响因子：
7.4
通讯作者：
Al-Rekabi, Salam
中科院分区：
文献类型：
--
作者：
Al-Majidi, Mohammed Haloob;Lampropoulos, Andreas P.;Al-Rekabi, Salam
应变硬化纤维增强地聚合物混凝土利用废旧材料而不是主要矿物产品，适合现场浇筑应用，显示出作为一种耐腐蚀、更环保的混凝土修复材料的巨大潜力。本研究评价了聚乙烯醇纤维增强土工聚合物混凝土作为修补材料的防腐性能。采用模拟表面涂层修补的试件，研究了聚乙烯醇纤维增强土工聚合物混凝土作为钢筋防腐修补材料的适用性。利用梁进行了大规模的梁修复，其中不同深度(占梁总深度的12.5%和25%)的部分混凝土保护层被聚乙烯醇纤维增强土聚合体混凝土取代。使用感应电流技术进行加速腐蚀试验，施加额定300 mA/cm(2)恒定阳极电流约90天。抗弯强度试验结果表明，加速锈蚀后，用聚乙烯醇纤维增强土聚合体混凝土修补的钢筋混凝土梁的结构性能有明显改善。研究结果表明：聚乙烯醇纤维增强土工聚合物混凝土表面涂层显著降低了锈蚀损伤的质量损失、裂缝分布和结构性能，而表面涂层厚度的差异也显著影响了修复梁的耐腐蚀性能。(C)2017爱思唯尔有限公司。保留所有权利。
Strain hardening fibre reinforced geopolymer concrete, which utilises waste material rather than primary mineral products and is suitable for cast-in-place applications, shows considerable potential as a resistant, more environmentally friendly, concrete repair material. This study assesses the corrosion protection performance of polyvinyl alcohol fibre reinforced geopolymer concrete as a repair material. The applicability of polyvinyl alcohol fibre reinforced geopolymer concrete as a repair material for preventing steel corrosion was investigated using specimens that simulated surface coating repair. Large scale beam repair was conducted using beams where part of the concrete cover at various depths (12.5% and 25% of the total beam depth) was replaced by polyvinyl alcohol fibre reinforced geopolymer concrete. Accelerated corrosion tests were performed using an induced current technique by applying a nominal 300 mA/cm(2) constant anodic current for approximately 90 days. Results from flexural strength tests showed significant improvements in the structural performance of the reinforced concrete beams repaired with polyvinyl alcohol fibre reinforced geopolymer concrete following accelerated corrosion. The results can be summarised as follows: surface coating with polyvinyl alcohol fibre reinforced geopolymer concrete significantly reduced corrosion damage in terms of mass loss, crack distributions and structural performance, while differences in surface coating thickness also considerably affected the corrosion resistance of the repaired beams. (C) 2017 Elsevier Ltd. All rights reserved.