XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water

In order to study the leaching characteristics of hardened cement paste by flowing environmental water, indoor simulated leaching tests of Portland cement paste were carried out at different flow velocities with home-made flow field device and tap water as the erosion medium. By means of mechanical...

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Main Authors: Lunchao Zhang, Jikai Zhou, Xu He, Chen Chen
Format: Article
Language:English
Published: Wiley 2020-01-01
Series:Advances in Civil Engineering
Online Access:http://dx.doi.org/10.1155/2020/6715271
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author Lunchao Zhang
Jikai Zhou
Xu He
Chen Chen
author_facet Lunchao Zhang
Jikai Zhou
Xu He
Chen Chen
author_sort Lunchao Zhang
collection DOAJ
description In order to study the leaching characteristics of hardened cement paste by flowing environmental water, indoor simulated leaching tests of Portland cement paste were carried out at different flow velocities with home-made flow field device and tap water as the erosion medium. By means of mechanical properties tests, X-ray diffraction (XRD), and Rietveld full-spectrum quantitative analysis of specimens after leaching at different ages, the change rules of the flexural strength, main phase composition, and mass fraction of the specimens after leaching were obtained. The results show that, within 90 days, the flow rate in the test has no obvious effect on the leaching of hardened cement paste. With the increase in age, the leaching of hardened cement paste gets more obvious. Rietveld full-spectrum quantitative analysis shows that the leaching of hardened cement paste changes with the relative content of CaCO3 and Ca(OH)2. The higher the relative content of CaCO3 is, the better compaction and leaching resistance the paste has. The leaching resistance of hardened cement paste is also related to the gradient of Ca(OH)2. The smaller the gradient is, the better the leaching resistance is. The Rietveld full-spectrum quantitative analysis method can be used as a method to evaluate the leaching effect of hardened cement paste.
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publishDate 2020-01-01
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series Advances in Civil Engineering
spelling doaj-art-c800986dee024dbdab48a43ce809c95f2025-02-03T05:49:38ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/67152716715271XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing WaterLunchao Zhang0Jikai Zhou1Xu He2Chen Chen3College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, ChinaCollege of Civil and Transportation Engineering, Hohai University, Nanjing 210098, ChinaCollege of Civil and Transportation Engineering, Hohai University, Nanjing 210098, ChinaCollege of Civil and Transportation Engineering, Hohai University, Nanjing 210098, ChinaIn order to study the leaching characteristics of hardened cement paste by flowing environmental water, indoor simulated leaching tests of Portland cement paste were carried out at different flow velocities with home-made flow field device and tap water as the erosion medium. By means of mechanical properties tests, X-ray diffraction (XRD), and Rietveld full-spectrum quantitative analysis of specimens after leaching at different ages, the change rules of the flexural strength, main phase composition, and mass fraction of the specimens after leaching were obtained. The results show that, within 90 days, the flow rate in the test has no obvious effect on the leaching of hardened cement paste. With the increase in age, the leaching of hardened cement paste gets more obvious. Rietveld full-spectrum quantitative analysis shows that the leaching of hardened cement paste changes with the relative content of CaCO3 and Ca(OH)2. The higher the relative content of CaCO3 is, the better compaction and leaching resistance the paste has. The leaching resistance of hardened cement paste is also related to the gradient of Ca(OH)2. The smaller the gradient is, the better the leaching resistance is. The Rietveld full-spectrum quantitative analysis method can be used as a method to evaluate the leaching effect of hardened cement paste.http://dx.doi.org/10.1155/2020/6715271
spellingShingle Lunchao Zhang
Jikai Zhou
Xu He
Chen Chen
XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water
Advances in Civil Engineering
title XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water
title_full XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water
title_fullStr XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water
title_full_unstemmed XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water
title_short XRD-Rietveld Method for Evaluating the Leaching Characteristics of Hardened Cement Paste in Flowing Water
title_sort xrd rietveld method for evaluating the leaching characteristics of hardened cement paste in flowing water
url http://dx.doi.org/10.1155/2020/6715271
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AT jikaizhou xrdrietveldmethodforevaluatingtheleachingcharacteristicsofhardenedcementpasteinflowingwater
AT xuhe xrdrietveldmethodforevaluatingtheleachingcharacteristicsofhardenedcementpasteinflowingwater
AT chenchen xrdrietveldmethodforevaluatingtheleachingcharacteristicsofhardenedcementpasteinflowingwater