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掺加超细再生粉末的波特兰水泥的早期行为：对水化、凝结和化学收缩的见解

Early-Age Behaviour of Portland Cement Incorporating Ultrafine Recycled Powder: Insights into Hydration, Setting, and Chemical Shrinkage.

作者信息

Yang Fei, Ma Yan, Li Linchang, Liu Shuo, Hai Ran, Zhu Zheyu

机构信息

School of Architectural and Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China.

Henan Building Materials Research and Design Institute Co., Ltd., Zhengzhou 450052, China.

出版信息

Materials (Basel). 2024 Nov 14;17(22):5551. doi: 10.3390/ma17225551.

DOI:10.3390/ma17225551
PMID:39597375
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11595937/
Abstract

This study examines the effects of ultrafine recycled powder (URP) obtained from construction and demolition waste on the hydration kinetics, setting behaviour, and chemical shrinkage of Portland cement pastes. The presence of ultrafine particles in the recycled powder provides more sites for nucleation, thereby promoting the hydration process and accelerating the rate of nucleation. As a result, the setting time is reduced while chemical shrinkage is increased. Incorporating URP improves the early-age mechanical properties. When 7.5% URP is added, the highest compressive strength and flexural strength of cement mortar at a curing age of 3 d are 23.0 MPa and 3.7 MPa, respectively. The secondary hydration between the hydration product and reactive silica from URP contributes to gel formation and enhances mechanical property development. This research provides theoretical insights into utilizing recycled powder in cement-based materials and enhances our understanding of its impact on hydration kinetics.

摘要

本研究考察了从建筑和拆除废物中获得的超细再生粉末（URP）对波特兰水泥浆体水化动力学、凝结行为和化学收缩的影响。再生粉末中存在的超细颗粒提供了更多的成核位点，从而促进水化过程并加速成核速率。结果，凝结时间缩短而化学收缩增加。掺入URP可改善早期力学性能。当添加7.5%的URP时，水泥砂浆在3天养护龄期的最高抗压强度和抗折强度分别为23.0MPa和3.7MPa。水化产物与URP中的活性二氧化硅之间的二次水化有助于凝胶形成并增强力学性能发展。本研究为在水泥基材料中利用再生粉末提供了理论见解，并增进了我们对其对水化动力学影响的理解。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/48c4c6cff7ca/materials-17-05551-g010a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/4c629f793d9e/materials-17-05551-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/6805481e8332/materials-17-05551-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/9c6cd3e1fbac/materials-17-05551-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/48c4c6cff7ca/materials-17-05551-g010a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/4c629f793d9e/materials-17-05551-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/7d6a43e96cb1/materials-17-05551-g004a.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/133d5df48d9b/materials-17-05551-g005.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/54fcd9ac53ae/materials-17-05551-g007.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/428d/11595937/48c4c6cff7ca/materials-17-05551-g010a.jpg

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引用本文的文献

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