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On-line Access: 2023-10-18

Received: 2022-11-28

Revision Accepted: 2023-03-28

Crosschecked: 2023-10-19

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Tung-chai LING


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Journal of Zhejiang University SCIENCE A 2023 Vol.24 No.10 P.886-897


Effect of CO2-mixing dose and prolonged mixing time on fresh and hardened properties of cement pastes

Author(s):  Minlu WANG, Shuang LUO, Ba Tung PHAM, Tung-Chai LING

Affiliation(s):  College of Civil Engineering, Hunan University, Changsha 410082, China

Corresponding email(s):   tcling@hnu.edu.cn, tcling611@yahoo.com

Key Words:  CO2-mixing, Calcium carbonate, Early cement hydration, Flowability, Microstructure

Minlu WANG, Shuang LUO, Ba Tung PHAM, Tung-Chai LING. Effect of CO2-mixing dose and prolonged mixing time on fresh and hardened properties of cement pastes[J]. Journal of Zhejiang University Science A, 2023, 24(10): 886-897.

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author="Minlu WANG, Shuang LUO, Ba Tung PHAM, Tung-Chai LING",
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publisher="Zhejiang University Press & Springer",

%0 Journal Article
%T Effect of CO2-mixing dose and prolonged mixing time on fresh and hardened properties of cement pastes
%A Minlu WANG
%A Shuang LUO
%A Ba Tung PHAM
%A Tung-Chai LING
%J Journal of Zhejiang University SCIENCE A
%V 24
%N 10
%P 886-897
%@ 1673-565X
%D 2023
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2200571

T1 - Effect of CO2-mixing dose and prolonged mixing time on fresh and hardened properties of cement pastes
A1 - Minlu WANG
A1 - Shuang LUO
A1 - Ba Tung PHAM
A1 - Tung-Chai LING
J0 - Journal of Zhejiang University Science A
VL - 24
IS - 10
SP - 886
EP - 897
%@ 1673-565X
Y1 - 2023
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2200571

This study aims to investigate the influence of CO2-mixing dose (mass fractions of 0.3%, 0.6%, and 0.9%) and prolonged mixing time on the fresh and hardened properties of cement pastes. The CO2-mixing can act as coagulant in fresh cement mixtures, resulting in a significant reduction in workability associated with the formation of a rich calcium carbonate network on the surface of cement particles. The CO2-mixing cement pastes were found to be much stiffer and more difficult to handle, place, and compact than the control mixture, which had a negative effect on the mechanical strength performance of the hardened pastes. However, prolonging the mixing time for 1 min (immediately after CO2-mixing) can effectively improve the workability (by ~53%–85%) by breaking up the flocculation network of deposited calcium carbonates. As a result, the presence of detached calcium carbonate accelerated early cement hydration and densified the microstructure; this improved early-age compressive strength by ~6%–32%, depending on the CO2-mixing dose used. Therefore, it seems that the CO2-mixing dose should be controlled at ≤0.6% with the mixing time prolonged in order to attain satisfactory workability and mechanical strength.


作者:汪珉璐,罗双,Ba Tung Pham,林忠财


Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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