Chong Wang , Mingyi Zhang , Qicai Wang , Jinpeng Dai , Tao Luo , Wansheng Pei , Andrey Melnikov , Ze Zhang
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引用次数: 13
Abstract
In this study, multi-scale experiments and micro-scale numerical simulation were used to comprehensively analyze the influencing mechanism of nano-silica (NS) on the concrete performances. With the NS content increases, the results indicate that the concrete performances are improved first and then deteriorated, and the optimum NS content is 2%. By improving the physical and mechanical properties of cement paste and meliorating the interface transition zone (ITZ) structure, 2% NS increases the compressive strength of the concrete sample cured for 28 days by 23.04%. Meanwhile, it can be found that 2% NS makes the pore structure the most refined and maximizes the compactness of concrete through the nuclear magnetic resonance technology, making concrete the best resistance to chloride ion penetration. Through numerical simulation, it can be found that the concrete added with 2% NS has the better resistance to external force than the concrete without NS, and the reason for the improvement is that 2% NS enhances the mechanical properties of ITZ and mortar. Although 5% NS meliorates the ITZ structure, it deteriorates the physical and mechanical properties of cement paste, which makes the compressive strength of concrete sample cured for 28 days decrease by 7.91%.
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.