Effect of Calcium-Magnesia Compound Expansive Agent on the Macroscopic Performance and Microstructure of Concrete

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY Journal of Advanced Concrete Technology Pub Date : 2024-08-20 DOI:10.3151/jact.22.445
Ji Xiao, Lang Jin, Feixiang Chen, Yong Leng, Guozhi Zhang, Kexin Liu
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Abstract

This study aims to discuss the effects of calcium-magnesia compound expansive agent on the mechanical strength, shrinkage, and creep of concrete. On this basis, the expansive mechanism is investigated by using XRD, TG measurement, and MIP with percolation and backbone fractal dimension analysis. It is shown that replacing fly ash with calcium-magnesia compound expansive agent has little effect on the axial compression strength, but significantly reduces the elastic modulus. Moreover, increasing the amount of expansive agent from 0% to 12% leads to a reduction in autogenous shrinkage values by 9.1% to 14.8% at 180 days while causing an increase in creep by 24.5% to 37.8%. Concurrently, the porosity of the concrete increases with the addition of the calcium-magnesia compound expansive agent, and the proportion of gel and medium capillary pores in the total porosity also increases. However, fractal dimension analysis shows that it also decreases the complexity of overall connectivity of interconnected pores. Furthermore, the results obtained from TG also indicate that the calcium-magnesia compound expansive agent is beneficial for the formation of gel hydration products.

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钙镁复合膨胀剂对混凝土宏观性能和微观结构的影响
本研究旨在探讨钙镁复合膨胀剂对混凝土机械强度、收缩和徐变的影响。在此基础上,利用 XRD、TG 测量、MIP 与渗流和骨架分形维度分析研究了膨胀机理。结果表明,用钙镁复合膨胀剂替代粉煤灰对轴向压缩强度影响不大,但会显著降低弹性模量。此外,将膨胀剂的用量从 0% 增加到 12%,可使 180 天的自生收缩值降低 9.1% 至 14.8%,同时使蠕变增加 24.5% 至 37.8%。同时,混凝土的孔隙率随着钙镁复合膨胀剂的添加而增加,总孔隙率中凝胶孔和中等毛细孔的比例也随之增加。然而,分形维度分析表明,它也降低了相互连接的孔隙整体连通性的复杂性。此外,TG 得出的结果还表明,钙镁复合膨胀剂有利于凝胶水合产物的形成。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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