Effect of Ultra-fine Fly Ash on Rheological Properties, Mechanical Properties and Microstructure of Ultra-high Performance Concrete
CAO Runzhuo1,2, ZHOU Mingru1,2, ZHOU Qun1,2, HE Yong1,2
1 Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050 2 Engineering Research Center for Disaster Prevention and Reduction of Civil Engineering in Western China, Lanzhou University of Technology, Lanzhou 730050
Abstract: In order to investigate the effect of ultra-fine fly ash (UFA) on the impact of ultra-high performance concrete (UHPC), the rheological properties, mechanical properties, pore structure and microstructure of UHPC were systematically studied by using UFA instead of NFA. The results show that when the mass fraction of UFA substitutes for NFA is less than 50%, the fluidity of UHPC would be significantly improved with the increase of the amount of UFA, and the further increase in the substitution of UFA (more than 50%) would reduce the fluidity of UHPC. The rheological properties also show that UFA could significantly reduce the yield stress and viscosity of UHPC paste. The mechanical test results show that the compressive strength and flexural strength of UHPC increase with the increase of UFA substitution amount. When UFA completely replace NFA (100%), the maximum compressive strength and flexural strength can reach 167.2 MPa and 25.2 MPa, respectively. Mercury pressure and X-CT were used to test the porosity of the UHPC hardened body. The results show that UFA can reduce the porosity of UHPC, and the scanning electron microscope also shows that UFA can make the microstructure of UHPC more compact, thus enabling the UHPC to exhibit excellent mechanical properties.
[1] Yallnkaya . Construction and Building Materials, 2017, 144, 252. [2] Lee N K, Koh K T, Kim M O, et al. Cement and Concrete Research, 2018, 104, 68. [3] Richard P, Cheyrezy M. Cement and Concrete Research, 1995, 25(7), 1501. [4] Sbia L A, Peyvandi A, Lu J, et al. Materials and Structures, 2017, 50(1), 7. [5] Song Q, Yu R, Wang X, et al. Construction and Building Materials, 2018, 158, 883. [6] Chen T, Gao X, Ren M. Construction and Building Materials, 2018, 158, 864. [7] Huang H, Gao X, Wang H, et al. Construction and Building Materials, 2017, 149, 621. [8] Meng W, Khayat K H. Composites Part B: Engineering, 2016, 107, 113. [9] Han B, Sun S, Ding S, et al. Composites Part A: Applied Science and Manufacturing, 2015, 70, 69. [10] Ma R, Guo L, Sun W, et al. Materials and Structures, 2017, 50(2), 166. [11] Narayanan A, Shanmugasundaram P. Energy and Buildings, 2017, 138, 539. [12] Cyr M, Lawrence P, Ringot E. Cement and Concrete Research, 2006, 36(2), 264. [13] Singh S, Ransinchung G D, Kumar P. Construction and Building Mate-rials, 2017, 156, 19. [14] Mohamed O A, Najm O F. Frontiers of Structural and Civil Engineering, 2017, 11(4), 406. [15] Hanif A, Lu Z, Li Z. Construction and Building Materials, 2017, 144, 373. [16] Venkatanarayanan H K, Rangaraju P R. Cement and Concrete Compo-sites, 2013, 43, 54. [17] Ravina D. Cement and Concrete Research, 1980, 10(4), 573. [18] Long G, Wang X Y, Xiao R, et al. Advances in Cement Research, 2003, 15(1), 17. [19] Gao Y, Zhou S. Journal of Central South University of Technology, 2005, 12(5), 596. [20] Zhang X, Han J. Cement and Concrete Research, 2000, 30(5), 827. [21] Collins F, Sanjayan J G. Cement and Concrete Research, 1999, 29(3), 459. [22] Mejdoub R, Hammi H, Khitouni M, et al. Journal of Materials in Civil Engineering, 2017, 29(6), 04017019. [23] Liu J Z. Study on preparation technology and static, dynamic tensile behaviour of ultra-high performance cementitious composites. Ph.D Thesis, Southeast University, China, 2013(in Chinese). 刘建忠. 超高性能水泥基复合材料的制备工艺及静,动态拉伸性能研究. 博士学位论文,东南大学, 2013. [24] Ehsani A, Nili M, Shaabani K. KSCE Journal of Civil Engineering, 2017, 21(5), 1854. [25] Kwan A, Fung W, Wong H. Advances in Cement Research, 2010,22(1),3. [26] Yahia A, Khayat K. Cement and Concrete Research, 2001, 31(5), 731. [27] Vikan H, Justnes H. Cement and Concrete Research, 2007, 37(11), 1512. [28] Ferraris C, Obla K, Hill R. Cement and Concrete Research, 2001, 31(2), 245. [29] Wang D, Zhang L, Zhang W, et al. Journal of Building Materials, 2012, 15(6),755 (in Chinese). 王栋民,张力冉,张伟利,等. 建筑材料学报, 2012,15(6), 755. [30] Siddique R. Cement and Concrete research, 2003, 33(4), 539. [31] Peng Y, Hu S, Ding Q. Journal of Wuhan University of Technology-Materials Science Edition, 2010, 25(2), 349. [32] Wang X, Jacobsen S, Lee S, et al. Materials and Structures, 2010, 43(1-2), 125. [33] Bentur A, Alexander M. Materials and Structures, 2000, 33(2), 82. [34] Bouasker M, Mounanga P, Turcry P, et al. Cement and Concrete Composites, 2008, 30(1), 13. [35] Awoyera P, Akinmusuru J, Dawson A, et al. Cement and Concrete Composites, 2018, 86, 224. [36] Zhang H, Tian K. Journal of Wuhan University of Technology-Materials Science Edition, 2011, 26(3), 533.
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2019, Vol. 33 
