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Advances in Civil Engineering
Volume 2018, Article ID 4023178, 7 pages
https://doi.org/10.1155/2018/4023178
Research Article

The Influence of Ground Fly Ash on Cement Hydration and Mechanical Property of Mortar

1College of Hydraulic and Civil Engineering, Shandong Agricultural University, Tai’an, Shandong 271018, China
2School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China
3Department of Civil Engineering, Tsinghua University, Beijing 100084, China

Correspondence should be addressed to Jingjing Feng; nc.ude.uads@gnijgnijgnef

Received 30 September 2017; Revised 3 February 2018; Accepted 19 February 2018; Published 2 May 2018

Academic Editor: Evangelos J. Sapountzakis

Copyright © 2018 Jingjing Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this study, the ground fly ash is made of ordinary grade I fly ash by grinding. Compared with grade I fly ash, the influence of ground fly ash on cement hydration and mechanical property of mortar was investigated. The results show that ground fly ash can improve the hydration of cement at all the ages compared with grade I fly ash, and not only does its pozzolanic reaction start earlier, but the reaction degree is higher and the speed is quicker. Before 3 days, the contribution of ground fly ash to the strength is mainly due to physical filling and microaggregate effect. After that, the contribution of pozzolanic effect to the strength becomes obvious and can significantly increase the compressive strength after 60 days and the flexural strength after 28 days. The ground fly ash is better than grade I fly ash to optimize the pore structure of hardened pastes. It can significantly reduce the number of harmful pores (>20 nm) and increase the number of harmless pores (<20 nm), which refines the pore structure and makes the structure denser.