Effects of Accelerators on the Early Hydration and Microstructure of Paste with Low Water-Binder Ratio
LUO Biao1, LUO Zhengdong1,*, REN Huiqi1,2, GUO Ruiqi1
1 College of Civil Engineering, Xiangtan University, Xiangtan 411105, Hunan, China 2 National Defense Engineering Institute, Academy of Military Science of PLA, Luoyang 471023, Henan, China
Abstract: Ultra-high performance concrete (UHPC) with low water-binder ratio and high cementitious material content usually occurs a problem of slowly setting and hardening under room temperature curing conditions. In order to promote the popularization and application of UHPC in the initial support of tunnels and rapid repair, it is proposed to use alkaline and alkali-free accelerators (referred to as NA and AS, respectively) to increase the early setting and hardening rate of the paste with low water-binder ratio. In this work, the early hydration behavior and setting and hardening of paste with low water-binder ratio in the presence of accelerators were studied through the tests of the isothermal calorimetry, released ion concentration, setting time and compressive strength. And the phase composition and microstructure evolution of hydration products were analyzed by X-ray diffraction, SEM morphology observation and EDS spectroscopy. The results show that the addition of accelerators accelerates the early hydration rate of the composite-cementitious-materials pastes with low water-binder ratio, and at the same time contributes to the setting and har-dening of the pastes. The acceleration effect of NA on UHPC is better than that of AS. The 1 d compressive strength of NA-2% was 53.3 MPa, and the 28 d strength ratio was 94.9%, while the 1 d compressive strength of AS-4% was 38.9 MPa, and the 28 d strength ratio was 92.3%. Accelerators promote the rapid formation of a large number of hydration products in the pastes with low water-binder ratio, thereby improving the compactness of the early microstructure, and the phase composition of hydration products is significantly affected by the type of accelerators.
通讯作者:
*罗正东,湘潭大学土木工程学院副教授、硕士研究生导师。2007年山东农业大学水利水电工程专业本科毕业,2014年湖南大学土木工程专业博士毕业(硕博连读)。目前主要从事混凝土材料、地下结构新型支护材料等方面的研究工作。发表论文20余篇,包括Journal of Materials Research and Technology、Materials Letters、Polymers、 Materials、《岩土工程学报》等。277619580@qq.com
罗彪, 罗正东, 任辉启, 郭瑞奇. 速凝剂对低水胶比浆体早期水化与微观结构的影响[J]. 材料导报, 2023, 37(9): 21080253-7.
LUO Biao, LUO Zhengdong, REN Huiqi, GUO Ruiqi. Effects of Accelerators on the Early Hydration and Microstructure of Paste with Low Water-Binder Ratio. Materials Reports, 2023, 37(9): 21080253-7.
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2023, Vol. 37 
