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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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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Tung-chai LING

https://orcid.org/0000-0002-8276-5212

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

http://doi.org/10.1631/jzus.A2200571


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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%T Effect of CO2-mixing dose and prolonged mixing time on fresh and hardened properties of cement pastes
%A Minlu WANG
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%A Ba Tung PHAM
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T1 - Effect of CO2-mixing dose and prolonged mixing time on fresh and hardened properties of cement pastes
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J0 - Journal of Zhejiang University Science A
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Abstract: 
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.

不同CO2搅拌剂量及后续搅拌对水泥浆体新拌和硬化性能的影响

作者:汪珉璐,罗双,Ba Tung Pham,林忠财
机构:湖南大学,土木工程学院,中国长沙,410082
目的:本文旨在探究不同CO2搅拌剂量对于水泥浆体新拌及硬化性能的影响,通过延长搅拌时间来提升其性能,并通过热重分析、扫描电镜观察等微观分析探究CO2与新拌水泥浆体之间的反应机理。
创新点:1.采用定制的具有气密性的搅拌仪器;2.通过延长搅拌时间改善CO2搅拌水泥浆体的流动性和微观结构。
方法:1.通过流动性、凝结时间、水化热测试对水泥浆体的新拌性能进行表征;2.通过抗压强度、吸水性及吸水率测试对水泥浆体的硬化性能进行表征;3.通过热重分析、扫描电镜观察、背散射电子图像分析对样品的微观结构进行表征。
结论:1.随着CO2剂量的增加,水泥浆体的流动性急剧下降,甚至失去塑性,这主要与水泥熟料表面生成的水合物和碳酸盐所形成絮凝网络有关。2在施加1min的后续搅拌后,新拌水泥浆体的流动性可以提高53%~85%,这是因为絮凝结构被破坏,被束缚的自由水释放。3.CO2搅拌会造成抗压强度降低约10%~20%,这是由于新拌水泥浆体的流动性差,导致硬化基质中形成了更多的孔隙结构。4.在施加1min的后续搅拌后,其抗压强度提高18%~32%;与对照样品相比,早期强度提高3%~15%,这是由于沉积的CaCO3的水化促进作用和其更致密的微观结构。5.样品的28d抗压强度与吸水率之间存在较强的线性相关性,说明孔隙分布对CO2搅拌水泥浆体强度变化起着重要作用。

关键词:CO2搅拌;碳酸钙;水泥早期水化;流动性;微观结构

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