Jian Liu , Yun Peng , Shenchun Xu , Pengcheng Yuan , Kefo Qu , Xiao Yu , Feng Hu , Wei Zhang , Yu Su
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Comparing with steel rebar reinforced NSC, inferior performance of plain and 2% basalt fibre reinforced G-UHPCs was observed owing to their own brittle characteristics, whereas superior performance of 1.5% steel fibre reinforced G-UHPC was achieved. Further, numerical investigations were conducted on the steel rebar reinforced NSC and 1.5% steel fibre reinforced G-UHPC slabs to reproduce their local damage induced by contact explosions through the explicit finite element code LS-DYNA. With the validated numerical model, parametric studies were performed to explore the effect of slab thickness and TNT charge weight on the local damage of 1.5% steel fibre reinforced G-UHPC slabs under contact explosions, and then the local damages were identified and classified via the support vector machine (SVM) method. Based on the machine learning results, empirical equations were derived for the fast assessment of local damage levels of 1.5% steel fibre reinforced G-UHPC slabs under contact explosions.</p></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":null,"pages":null},"PeriodicalIF":7.4000,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"15","resultStr":"{\"title\":\"Investigation of geopolymer-based ultra-high performance concrete slabs against contact explosions\",\"authors\":\"Jian Liu , Yun Peng , Shenchun Xu , Pengcheng Yuan , Kefo Qu , Xiao Yu , Feng Hu , Wei Zhang , Yu Su\",\"doi\":\"10.1016/j.conbuildmat.2021.125727\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Geopolymer-based ultra-high performance concrete (G-UHPC) is a new form of UHPC, which has been developed to meet the demand for ultra-high strength, cost-effective and eco-friendly construction materials. This paper preliminarily investigated local damage of fibre reinforced G-UHPC slabs subjected to contact explosions. Under 0.4 kg TNT, three 150 mm thick slabs including one control specimen made of steel rebar reinforced normal strength concrete (NSC) and two G-UHPC slabs, i.e. plain G-UHPC and 1.5% steel fibre reinforced G-UHPC, were tested. Under 1.0 kg TNT, two 200 mm thick slabs including one control specimen made of steel rebar reinforced NSC and one 2% basalt fibre reinforced G-UHPC slab were tested. Comparing with steel rebar reinforced NSC, inferior performance of plain and 2% basalt fibre reinforced G-UHPCs was observed owing to their own brittle characteristics, whereas superior performance of 1.5% steel fibre reinforced G-UHPC was achieved. 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引用次数: 15
摘要
地聚合物基超高性能混凝土(G-UHPC)是一种新型的超高性能混凝土,是为了满足人们对超高强度、高性价比和环保建筑材料的需求而发展起来的。初步研究了纤维增强G-UHPC板在接触爆炸作用下的局部损伤。在0.4 kg TNT的作用下,测试了3块150mm厚的板,包括一块钢筋加筋标准强度混凝土(NSC)的对照试件和2块G-UHPC板,即普通G-UHPC和1.5%钢纤维增强G-UHPC。在1.0 kg TNT作用下,试验了两块200 mm厚的板坯,其中一块为钢筋加筋NSC板,另一块为2%玄武岩纤维加筋G-UHPC板。与钢筋加固的NSC相比,普通和2%玄武岩纤维增强的G-UHPC由于其自身的脆性特性而性能较差,而1.5%钢纤维增强的G-UHPC性能较好。此外,通过显式有限元程序LS-DYNA对钢筋加筋NSC和1.5%钢纤维加筋G-UHPC板进行数值模拟,再现了接触爆炸引起的局部损伤。利用验证的数值模型,对1.5%钢纤维增强G-UHPC板在接触爆炸作用下,板坯厚度和TNT装药重量对局部损伤的影响进行了参数化研究,并利用支持向量机(SVM)方法对局部损伤进行了识别和分类。基于机器学习结果,导出了1.5%钢纤维增强G-UHPC板在接触爆炸作用下局部损伤水平快速评估的经验方程。
Investigation of geopolymer-based ultra-high performance concrete slabs against contact explosions
Geopolymer-based ultra-high performance concrete (G-UHPC) is a new form of UHPC, which has been developed to meet the demand for ultra-high strength, cost-effective and eco-friendly construction materials. This paper preliminarily investigated local damage of fibre reinforced G-UHPC slabs subjected to contact explosions. Under 0.4 kg TNT, three 150 mm thick slabs including one control specimen made of steel rebar reinforced normal strength concrete (NSC) and two G-UHPC slabs, i.e. plain G-UHPC and 1.5% steel fibre reinforced G-UHPC, were tested. Under 1.0 kg TNT, two 200 mm thick slabs including one control specimen made of steel rebar reinforced NSC and one 2% basalt fibre reinforced G-UHPC slab were tested. Comparing with steel rebar reinforced NSC, inferior performance of plain and 2% basalt fibre reinforced G-UHPCs was observed owing to their own brittle characteristics, whereas superior performance of 1.5% steel fibre reinforced G-UHPC was achieved. Further, numerical investigations were conducted on the steel rebar reinforced NSC and 1.5% steel fibre reinforced G-UHPC slabs to reproduce their local damage induced by contact explosions through the explicit finite element code LS-DYNA. With the validated numerical model, parametric studies were performed to explore the effect of slab thickness and TNT charge weight on the local damage of 1.5% steel fibre reinforced G-UHPC slabs under contact explosions, and then the local damages were identified and classified via the support vector machine (SVM) method. Based on the machine learning results, empirical equations were derived for the fast assessment of local damage levels of 1.5% steel fibre reinforced G-UHPC slabs under contact explosions.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.