Materials Reports  2020, Vol. 34 Issue (Z1): 203-208 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Analysis of Influencing Factors on Workability and Strength of Ultra-highPerformance Concrete |
| LU Zhe1, FENG Zhengang1, YAO Dongdong2, JI Hongru1, QIN Weijun2, YU Limei2
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1 School of Highway, Chang'an University, Xi'an 710064, China;
2 Jilin Provincial Transport Scientific Research Institute, Changchun 130000, China |
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Abstract The material composition has a critical impact on the performance of ultra-high performance concrete (UHPC). The effects of water-binder ratio, steel fiber, super-plasticiser, silica fume and fly ash on the workability and strength of UHPC were analyzed by using the flow expansion test, compressive strength and flexural strength tests. The suitable composition of UHPC was put forward. Through the grey relation analysis method, the influence degree of different factors on the workability and strength of UHPC was compared. The results show that recommended dosage of UHPC components is as follows: water-binder ratio 0.18—0.20, steel fiber 25—50 kg/m3, super-plasticise 20—25 kg/m3, silica fume 120—130 kg/m3, fly ash 100—110 kg/m3. The water-binder ratio has the greatest impact on the workability of UHPC. The greater the water-binder ratio is, the better the fluidity of UHPC. The steel fiber content has minimal impact on its workability. Compared with water-binder ratio and steel fiber, fly ash, super-plasticiser and silica fume have obvious effects on the compressive strength of UHPC. The water-binder ratio has the greatest effect but the silica fume has the least effect on the flexural strength of UHPC.
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Published: 01 July 2020
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51508032), the Transportation Science & Technology Project of Jilin Province(2017-1-7), the Fundamental Research Funds for the Central Universities (300102219216). |
| About author:: Zhe Lu, a master's degree in the School of Highway of Chang'an University, is mainly engaged in the research of road building materials ; Zhengang Feng, Ph.D. in Engineering, post-doctoral experience, winner of outstanding doctoral dissertation in Hubei Province. He is currently an associate professor and a master's tutor at the School of Highway of Chang'an University. He is mainly engaged in the research and teaching of road building materials and interdisciplinary subjects. He has published more than 30 articles in important domestic and foreign journals, of which 20 have been searched by SCI and EI, and more than 10 patents have been authorized. |
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