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CLC number: TQ172

On-line Access: 2011-07-04

Received: 2010-11-25

Revision Accepted: 2011-03-30

Crosschecked: 2011-06-21

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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.7 P.503-510

http://doi.org/10.1631/jzus.A1000479


Hydration process in Portland cement blended with activated coal gangue


Author(s):  Xian-ping Liu, Pei-ming Wang, Min-ju Ding

Affiliation(s):  Key Laboratory of Advanced Civil Engineering Materials (Tongji University), Ministry of Education, Shanghai 201804, China, State Key Laboratory Breeding Base of Crime Scene Evidence, Shanghai 200083, China

Corresponding email(s):   lxp@tongji.edu.cn, tjwpm@126.com, dingmj803@yahoo.com.cn

Key Words:  Activated coal gangue, Portland cement, Blended cement, Hydration, Strength


Xian-ping Liu, Pei-ming Wang, Min-ju Ding. Hydration process in Portland cement blended with activated coal gangue[J]. Journal of Zhejiang University Science A, 2011, 12(7): 503-510.

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%T Hydration process in Portland cement blended with activated coal gangue
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%A Pei-ming Wang
%A Min-ju Ding
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000479

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T1 - Hydration process in Portland cement blended with activated coal gangue
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1000479


Abstract: 
This paper deals with the hydration of a blend of portland cement and activated coal gangue in order to determine the relationship between the degree of hydration and compressive strength development. The hydration process was investigated by various means: isothermal calorimetry, thermal analysis, non-evaporable water measurement, and X-ray diffraction analysis. The results show that the activated coal gangue is a pozzolanic material that contributes to the hydration of the cement blend. The pozzolanic reaction occurs over a period of between 7 and 90 d, consuming portlandite and forming both crystal hydrates and ill-crystallized calcium silicate hydrates. These hydrates are similar to those found in pure portland cement. The results show that if activated coal gangue is substituted for cement at up to 30% (w/w), it does not significantly affect the final compressive strength of the blend. A long-term compressive strength improvement can in fact be achieved by using activated coal gangue as a supplementary cementing material. The relationship between compressive strength and degree of hydration for both pure portland cement and blended cement can be described with the same equation. However, the parameters are different since blended cement produces fewer calcium silicate hydrates than pure portland cement at the same degree of hydration.

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