矿物掺合料对聚羧酸减水剂与水泥相容性的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.012.024

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Abstract Quick loss of fluidity and slump is commonly happened in concrete due to poor compatibility between superplasticizer and cement, which can be affected by the use of mineral admixtures. The effects of fly ash, slag and silica fume on fluidity of cement pastes, mortars and concretes were studied, and their effects on the content of polycarboxylate superplasticizer adsorbed on cement were tested by TOC method. Then, the compatibility between polycarboxylate superplasticizer and cement affected by fly ash, slag and silica fume was analysed. The results show that the beneficial impact of fly ash combined with slag on the fluidity of cement paste could be regarded as a superposition effect and quantified by the weighted average of the water-reducing rate. Silica fume has an adverse effect which is greater than the additional water-reducing effect of fly ash and slag on the fluidity of cement paste, which is unfavourable to the compatibility between polycarboxylate superplasticizer and cement. Fly ash and slag increase the effective adsorption content, resulting in good dispersion or high water reducing by polycarboxylate superplasticizer. There exists additional water-reducing effect induced by fly ash and slag in concrete but not obviously.

Key words： admixture polycarboxylate superplasticizer superimposed effect fluidity compatibility effective absorption content

Published: 25 June 2017 Online: 2018-05-08

CLC number:

TU528.04

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	Articles by authors
	LI Zhikun
	PENG Jiahui
	YANG Zaifu

Cite this article:

LI Zhikun,PENG Jiahui,YANG Zaifu. Effect of Mineral Admixtures on the Compatibility of Polycarboxylate Superplasticizer and Cement[J]. Materials Reports, 2017, 31(12): 115-120.

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https://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.012.024 OR https://www.mater-rep.com/EN/Y2017/V31/I12/115

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