超早强聚羧酸对低坍落度混凝土流变与气泡结构经时变化的影响

doi:10.11896/cldb.20070236

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Abstract Polycarboxylate (PCE) comb-like copolymers with super-length side chains (i.e., one with ether-type side chains and the other with ester-type side chains) and normal-length side chains were employed to prepare low slump concrete in this paper. Influence of the superplasticizers on the time-dependent behavior of fresh properties and air-void structure of low slump concrete were investigated by fluidity test, rheological analysis, air-void parameters measurement of wet-screened mortar and air bubble shape 3D reconstruction in the mortar during hardening. The results showed that a strong linear relationship between fluidity and yield stress of the wet-screened mortar as Bingham fluid was revealed, regardless of PCE types. Superplasticizers with super-length of side chains weakened the fluidity retention of mortar in comparison with superplasticizer of normal molecular structure. The two PCEs with super-length side chains presented less initial air-entraining efficacy and amount ratio of small air bubbles than the normal one, and advanced the process of reduction of small air bubbles and growth of large air bubbles. The 3D reconstruction analysis of air bubble shape visually proved the coalescence of adjacent bubbles exists, and PCEs with super-length side chains led to an earlier coalescence.

Key words： super early strength polycarboxylate low slump super-length side chains concrete rheology air-void

Published: 12 November 2021

CLC number:

TU528.31

Fund:Natural Science Foundation of Jiangsu Province(BK20181127), Jiangsu Transportation Technology and Achievement Transformation Project(2019Z04).

Corresponding Authors: jiangqian@cnjsjk.cn

About author:: Qian Jiang received his M.S. degrees in March 2013 from Southeast University in material engineering. He is currently a senior engineer in Jiangsu Sobute New Materials Co. Ltd., focusing on the research of improving concrete performance.

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	JIANG Qian
	YU Cheng
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Cite this article:

JIANG Qian,YU Cheng,YUAN Sensen, et al. Influence of Super Early Strength Polycarboxylate Superplasticizer on Time-dependent Behavior of Rheological Properties and Air-Void Structure of Low Slump Concrete[J]. Materials Reports, 2021, 35(20): 20022-20027.

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http://www.mater-rep.com/EN/10.11896/cldb.20070236 OR http://www.mater-rep.com/EN/Y2021/V35/I20/20022

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