Materials Reports  2019, Vol. 33 Issue (z1): 229-233 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| The Effect of Two-stage Variable-speed Mixing on the Stability of High-strength Concrete |
| HU Jianwei1, XIE Yongjiang1,2, LIU Zike1,2, WENG Zhicai1,2, WANG Yuehua1,2, HE Long1,2
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1 China Academy of Railway Science, Beijing 100081
2 State Key Laboratory for Track Technology of High-speed Railway, Beijing 100081 |
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Abstract The high-strength concrete was prepared by different mixing approaches and the concrete stability test was carried out. The influence of mi-xing approach on the bubble structural parameters, density, compressive strength and microhardness of concrete was studied. The results show that two-stage variable-speed mixing approach can better improve the bubble structure of fresh concrete. The bubble content increases obviously, which is less than 500 μm. The two-stage variable-speed mixing approach reduces the density difference between the upper and lower layers of concrete significantly. The improvement of compressive strength of concrete is not obvious, but the compressive strength dispersion coefficient is significantly reduced. The two-stage variable-speed mixing approach can reduce the stratification trend of concrete, reduce the microhardness difference gradient, and improve the stability of concrete
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Published: 05 July 2019
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| About author:: Jianwei Hu born in September 1988, is a doctoral student in bridge and tunnel engineering of China Aca-demy of Railway Sciences. He is mainly engaged in the work of cement concrete products and the synthesis and application of early strength nanomaterials. He has participated in five national key research and development plans, the railway company's science and technology projects and the China Railway Science Research Institute fund project.Yongjiang Xie born in June 1964, master of building materials, researcher, doctoral tutor. He is currently the director of the Engineering Materials Division of China Railway Science Research Group Co., Ltd. and an academic leader in the field of railway engineering materials.He has long been engaged in railway engineering materials, concrete products and concrete construction technology research work, and hosted and participated in the completion of 54 national 863, 973, National Natural Science Foundation, Ministry of Science and Technology, Ministry of Railways and Railway Corporation's scientific and technological projects, won 1 national science and technology special prize, 16 provincial and ministerial awards, authorized national patent 40 project, published 102 academic papers, edited and participated in 27 national and industry stan-dards. |
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1 同济大学,重庆建筑学院,武汉建筑工业学院. 混凝土制品工艺学,中国建筑工业出版社,1986.
2 Ferraris C F. Journal of Research of the National Institute of Standards and Technology,2001,106(2),391.
3 Yang M, Jennings H M. Advanced Cement Based Materials,1995,2(2),70.
4 Aiad I, Abd El-Aleem S, El-Didamony H. Cement and Concrete Research,2002,32(11),1839.
5 Pavid A Williams, Aaron Wsaak, Hamlin M Jennings. Cement and Concrete Research,1999,29(9),1491.
6 Zhang S H, Wang K J. Journal of Astm International,2006,3(10),1246.
7 Sokhuan Choi, Surendra P Shah. Journal of Engineering Mechanics,1998,124 (1) ,94.
8 三浦達男.建設機械,1986,22(18),109.
9 Dils J, Boel V. Materials and Structures,2012,45(11),1673.
10 Chang P K, Peng Y N. Cement and Concrete Research,2001,31(1),87.
11 Hemalatha T, Sundar K R R, Murthy A R, et al. Construction and Building Materials,2015,98,119.
12 Collin V, Jézéquel P H. Cement and Concrete Research,2009,39(8),678.
13 冯忠绪,王卫中,姚运仕,等.中国公路学报,2006(2),116.
14 Rejeb Saeed Khalaf. Cement and Concrete Research,1996,26(4),585.
15 Nipat Puthipad, Masahiro Ouchi, Sovannsathya Rath, et al.Construction and Building Materials,2017,144(7),1. |
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