William Wilson , Fabien Georget , Karen L. Scrivener
{"title":"Towards a two-step assessment of the chloride ingress behaviour of new cementitious binders","authors":"William Wilson , Fabien Georget , Karen L. Scrivener","doi":"10.1016/j.cemconres.2024.107594","DOIUrl":null,"url":null,"abstract":"<div><p>A wide range of systems were exposed to a seawater-like chloride concentration (0.5 M Cl<sup>−</sup>) for bulk diffusion experiments over 0.5, 1 and 4 years. Combined with previously published findings on chloride binding and mini-migration testing, the results showed that chloride ingress into saturated blended cement pastes is a diffusion-governed process, obeying the square root-law or a modified version including an offset to account for slow microstructure changes. Chloride ingress is also strongly correlated with bulk electrical conductivity, suggesting a negligible effect of chloride binding variations between the systems studied. These findings support a two-step approach to rapidly characterise the chloride ingress behaviour of new binders at the cement paste scale. A screening with bulk conductivity measurements investigates promising binders and the kinetics of their diffusion properties. In a second step, bulk diffusion tests and the square root law with an offset are used to predict chloride ingress.</p></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":null,"pages":null},"PeriodicalIF":10.9000,"publicationDate":"2024-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0008884624001753/pdfft?md5=0b81e1e06ff51adb6af24b69c76c15b0&pid=1-s2.0-S0008884624001753-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cement and Concrete Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0008884624001753","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
A wide range of systems were exposed to a seawater-like chloride concentration (0.5 M Cl−) for bulk diffusion experiments over 0.5, 1 and 4 years. Combined with previously published findings on chloride binding and mini-migration testing, the results showed that chloride ingress into saturated blended cement pastes is a diffusion-governed process, obeying the square root-law or a modified version including an offset to account for slow microstructure changes. Chloride ingress is also strongly correlated with bulk electrical conductivity, suggesting a negligible effect of chloride binding variations between the systems studied. These findings support a two-step approach to rapidly characterise the chloride ingress behaviour of new binders at the cement paste scale. A screening with bulk conductivity measurements investigates promising binders and the kinetics of their diffusion properties. In a second step, bulk diffusion tests and the square root law with an offset are used to predict chloride ingress.
期刊介绍:
Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.