速凝剂对低水胶比浆体早期水化与微观结构的影响

doi:10.11896/cldb.21080253

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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.

Key words： low water-binder ratio accelerators early hydration hydration products microstructure

Published: 10 May 2023 Online: 2023-05-04

CLC number:

TU528.53

Fund:National Natural Science Foundation of China (12072309), the Special Funds for the Construction of Innovative Provinces in Hunan (2019RS1059), the Open Research Fund of Key Laboratory of Construction and Safety of Water Engineering of the Ministry of Water Resources, China Institute of Water Resources and Hydropower Research (202109), the Education Department Research Foundation of Hunan Province (21B0123), and the Postgraduate Scientific Research Innovation Project of Hunan Province(QL20210155).

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	LUO Biao
	LUO Zhengdong
	REN Huiqi
	GUO Ruiqi

Cite this article:

LUO Biao,LUO Zhengdong,REN Huiqi, et al. Effects of Accelerators on the Early Hydration and Microstructure of Paste with Low Water-Binder Ratio[J]. Materials Reports, 2023, 37(9): 21080253-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21080253 OR http://www.mater-rep.com/EN/Y2023/V37/I9/21080253

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