INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effects of Eco-friendly Fine Aggregates on Mechanical Properties of Ultra-high Performance Concrete |
CHU Hongyan1,2, JIANG Jinyang2,3, LI He1, XIA Guanglin1
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1 College of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China 2 Jiangsu Key Laboratory of Construction Materials, Nanjing 211189, China 3 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China |
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Abstract Nowadays, the supply of river sand is not adequate to the demand in China, and thus a preliminary evaluation on the feasibility of using eco-friendly aggregates to produce green ultra-high performance concrete (UHPC) was carried out. Different mechanical properties of green UHPC were investigated according to the standard test method by replacing river sand with eco-friendly aggregates (recycled sand, manufactured sand, aeolian sand). The workability and the microstructure of green UHPC were also studied. The workability of green UHPC with eco-friendly aggregates was rather well, and their mechanical properties were comparable or even higher than those of normal UHPC with river sand. The mechanical properties of green UHPC with manufactured sand were much better, and the compressive strength, flexural strength, and modulus of elasticity of this kind of green UHPC were 169.9 MPa, 18.8 MPa, and 47.8 GPa, respectively, which indicated that the compressive strength, fle-xural strength, and modulus of elasticity of green UHPC with manufactured sand were 5.20%, 15.34%, and 5.75% higher than those of normal UHPC with river sand, respectively. In addition, the pore structure of green UHPC was improved to a certain extent due to the utilization of the manufactured sand and aeolian sand in the green UHPC.
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Published: 24 December 2020
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Fund:This work was financially supported by the National Natural Science Foundation of China (51808294), the Natural Science Foundation of the Education Department of Jiangsu (18KJB430017). |
About author:: Hongyan Chu received his Ph.D. degree in Enginee-ring from Southeast University in 2017. He is currently a lecturer in Nanjing Forestry University. He is engaged in the development of high performance civil engineering materials, focusing on the preparation, characterization, and application of novel nuclear sacrificial mate-rials and green ultra-high performance cement-based materials. |
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