环保型石膏-水泥-火山灰胶凝体系的早期水化过程研究

doi:10.11896/j.issn.1005-023X.2017.05.020

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Abstract The effect of composition and hydration condition of an environmentally-friendly gypsum-cement-pozzolan binder system (GCP binder system) on its early hydration process was studied by means of X-ray diffraction (XRD) and heat flow calorimeter. It was found that the main hydration products of the GCP-slurry after the early hydration were ettringite, gypsum, portlandite, calcite and amorphous CSH phase. The content of ettringtie increased over time whereas the content of gypsum decreased. Results from heat flow calorimeter indicated the retarding effect of superplasticizer on the hydration process within the first 70 h of GCP bin-dersystem. Metakaolin could improve the formation of ettringite whereas microsilica could hinder it. Portlandite could only be mea-sured within the first week after hydration due to the pozzolanic reaction. The underwater hydration condition could promote the formation of ettringite and prevent the contact between the sample and carbon dioxide as well, which could lead to the reduction of calcite content.

Key words： gypsum-cement-pozzolan binder system (GCP) X-ray diffraction (XRD) heat flow calorimeter

Published: 02 May 2018

CLC number:

TB321

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	WANG Boyuan
	YAO Wu

Cite this article:

WANG Boyuan,YAO Wu. Study on Early Hydration Process of an Environmentally-friendly Gypsum-Cement-Pozzolan Binder System[J]. Materials Reports, 2017, 31(5): 123-127.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.05.020 OR http://www.mater-rep.com/EN/Y2017/V31/I5/123

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