半浸泡硫铝酸盐水泥混凝土蒸发区孔结构变化

doi:10.11896/cldb.21080270

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Abstract The hydration of calcium sulphoaluminate (CSA) cement needs a large amount of water and hydrates quickly. A large amount of unhydrated cement will be left, and ettringite will be further formed in the harden concrete, influencing the development of pore structure and mechanical properties of concrete. In this paper, the field conditions of half-immersed concrete were simulated by half immersion method. The pore structures of evaporation zone of CSA cement concretes with the water-cement ratio of 0.35, 0.45 and 0.55 were studied after half-immersion for 35 d, 70 d and 130 d by means of nuclear magnetic resonance (NMR) and scanning electron microscope (BSE mode). The test results showed that the porosities of concretes with the water-cement ratio of 0.35 and 0.45 increased, then decreased, and increased again; the porosity of concrete with the water-cement ratio of 0.55 declined, and then increased. The test results supported that the pore structure development of CSA cement concrete was controlled by the combined effects of crystallization expansion and pore refinement due to the ettringite formation after hardening.

Key words： partially immersion calcium sulphoaluminate cement concrete pore structure ettringite crystallization

Published: 10 February 2023 Online: 2023-02-23

CLC number:

TU528.1

Fund:The National Natural Science Foundation of China (51378508).

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	Articles by authors
	LIU Zanqun
	ZHOU Yunchan
	HU Wenlong
	PENG Jiawei

Cite this article:

LIU Zanqun,ZHOU Yunchan,HU Wenlong, et al. Pore Structure Development of Evaporation Zone of Partially Immersed Calcium Sulphoaluminate Cement Concrete[J]. Materials Reports, 2023, 37(3): 21080270-5.

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http://www.mater-rep.com/EN/10.11896/cldb.21080270 OR http://www.mater-rep.com/EN/Y2023/V37/I3/21080270

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