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Steel/basalt rebar reinforced Ultra-High Performance Concrete components against methane-air explosion loads
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-07-08 , DOI: 10.1016/j.compositesb.2020.108215
Qingfei Meng , Chengqing Wu , Jun Li , Zhongxian Liu , Pengtao Wu , Yekai Yang , Zhongqi Wang

Ultra-High Performance Concrete (UHPC) is a relatively new construction material, which has been investigated over the past few decades. Despite its exceptional mechanical strength, UHPC still requires passive steel reinforcement to maximise its bending capacity and the overall material cost will be high. The basalt fibre rebar has a higher mechanical strength than steel rebar with lower cost. In addition, it also has better alkali resistance and good cost-effectiveness. The basalt fibre rebar is therefore considered as a potential alternative reinforcement in the structural member. In this study, a recently developed UHPC formula was adopted, the conventional steel rebar and basalt fibre rebar were used as reinforcement. The developed components were tested against static flexural and methane-air explosion loads. In the four-point flexural tests, the basalt fibre rebar reinforced specimen (400 mm × 100 mm × 100 mm) performed more ductile structural behaviour with higher flexural strength. Two large scale methane-air explosion tests were conducted in buried utility tunnels with different length (i.e., 12000 mm × 1800 mm × 600 mm and 20000 mm × 1800 mm × 600 mm). The experimental test in shorter tunnel yielded lower explosion pressure [1] with marginal structural response. The test in longer tunnel achieved a higher explosion pressure on concrete elements. The C30 and UHPC specimens (1800 mm × 400 mm × 90 mm) with steel/basalt fibre rebar reinforcement were tested. The pressure and deflection data revealed that basalt fibre rebar reinforced UHPC component had a more ductile structural behaviour against accidental gas explosion.



中文翻译:

钢/玄武岩钢筋增强的超高性能混凝土组件可抵抗甲烷-空气爆炸载荷

超高性能混凝土(UHPC)是一种相对较新的建筑材料,在过去的几十年中已经进行了研究。尽管具有出色的机械强度,UHPC仍需要使用被动钢加固来最大化其弯曲能力,并且总体材料成本很高。玄武岩纤维钢筋比钢钢筋具有更高的机械强度,且成本更低。此外,它还具有更好的耐碱性和良好的成本效益。因此,玄武岩纤维钢筋被认为是结构构件中潜在的替代增强材料。在这项研究中,采用了最近开发的UHPC公式,使用常规的钢筋和玄武岩纤维钢筋作为增强材料。对开发的组件进行了静态弯曲和甲烷空气爆炸载荷测试。在四点弯曲试验中,玄武岩纤维钢筋增强标本(400 mm×100 mm×100 mm)表现出更大的延展性和更高的抗弯强度。在不同长度(即12000 mm×1800 mm×600 mm和20000 mm×1800 mm×600 mm)的地下公用隧道中进行了两次大规模的甲烷-空气爆炸试验。在较短的隧道中进行的实验测试产生了较低的爆炸压力[1],并且具有有限的结构响应。在更长的隧道中进行的试验对混凝土构件产生了更高的爆炸压力。测试了带有钢/玄武岩纤维钢筋的C30和UHPC试样(1800毫米×400毫米×90毫米)。压力和挠度数据表明,玄武岩纤维钢筋增强的UHPC组件具有更好的延展性,可防止意外气体爆炸。

更新日期:2020-07-13
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