| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Effect of Saturated Lightweight Aggregate and SRA on the Hydration Process and Autogenous Shrinkage of UHPC |
| XU Binbin1, OU Zhongwen1,2, LUO Wei1, LIU Na1, YUAN Wang1, FU Laiping1
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1 Department of Military Infrastructure, Army Logistics University of PLA, Chongqing 400030, China
2 College of Material Science and Engineering, Sichuan University of Science & Engineering, Zigong 643000, China |
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Abstract This paper investigated the influence of saturated lightweight aggregate, shrinkage reducing agent (SRA) and the combined effects of both on the hydration process and autogenous shrinkage of ultra-high performance concrete (UHPC) by testing the setting time, compressive strength, hydration heat autogenous shrinkage and relative humidity. The results showed that saturated lightweight aggregate and SRA can reduce autogenous shrinkage of UHPC. At 50% replacement of lightweight aggregate, the autogenous shrinkage decreased significantly, 7.2% of the reference. The reason can be ascribed to the fact that the internal curing water slowly released in 4 d, mitigating the self-desiccation effect, which indicated that internal curing was effective in reducing autogenous shrinkage of UHPC, but bad for its mechanical properties. Simultaneously, lightweight aggregate at lower replacement together with SRA exert an comprehensive effect on restriction of autogenous shrinkage of UHPC. The porous structure of lightweight aggregate produce certain adsorption effect of SRA, reducing its effective content in initial pore solution, maintaining the internal relative humidity to decrease autogenous shrinkage, and mitigating the adverse impact on the early strength and the hydration process.
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Published: 02 December 2020
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| Fund:This work was financially supported by the Logistics Research Project (BLJ17J008). |
| About author:: Binbin Xuis a master in material engineering in Army Logistics University of PLA and his research field is related to autogenous shrinkage control of UHPC.Zhongwen Oureceived his Ph.D. degrees in material science and engineering from Chongqing University in 2003. He is a doctoral supervisor in Civil Engineering College in Army Logistics University of PLA, also a member of the Civil Engineering Material Education Committee of the Ministry of Education, and the editorial board of Journal of Surface Technology and Material Protection. He was appointed as a Deputy Director of the Science and Technology Committee of the China Surface Engineering Association. In recent years, he presided or researched more than 30 National Key Basic Research Projects, National Science and Technology Key Projects, and the National Natural Science Foundation of China. Simultaneously, he has published more than 100 research papers in the field of material science and engineering, been awarded 23 patents for inventions. His research inte-rests mainly include civil engineering materials |
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2020, Vol. 34 
