Yoonjung Han , Jonathan Lapeyre , Natasha Van Dam Levy , Mine G. Ucak-Astarlioglu , Jedadiah F. Burroughs , Jeffrey W. Bullard
{"title":"在 pH 值为 13、温度为 23 ℃ 的 KOH 溶液中,致密硅灰和未致密硅灰的溶解动力学","authors":"Yoonjung Han , Jonathan Lapeyre , Natasha Van Dam Levy , Mine G. Ucak-Astarlioglu , Jedadiah F. Burroughs , Jeffrey W. Bullard","doi":"10.1016/j.cemconres.2024.107586","DOIUrl":null,"url":null,"abstract":"<div><p>The reaction kinetics of silica fume in Portland cement binders directly affect porosity and strength development during the early and intermediate stages of hydration. This study sheds light on silica fume’s dissolution rate and mechanism at 23<!--> <!-->°C in a 0.1<!--> <!-->mol<!--> <!-->L<sup>-1</sup> KOH solution as a function of its composition, specific surface area, and saturation state. Conductivity measurements are used to continuously track the reaction progress and correlate it to dissolved concentration. The dependence of the dissolution rate on silica fume surface area and saturation state is described, and a rate equation consistent with standard chemical kinetics is developed to model the rates as a function of the thermodynamic driving force. The inferred rate equation can be used to improve models of microstructure evolution in blended cement binders.</p></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":null,"pages":null},"PeriodicalIF":10.9000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Dissolution kinetics of densified and undensified silica fume in a KOH solution at pH 13 and 23 °C\",\"authors\":\"Yoonjung Han , Jonathan Lapeyre , Natasha Van Dam Levy , Mine G. Ucak-Astarlioglu , Jedadiah F. Burroughs , Jeffrey W. Bullard\",\"doi\":\"10.1016/j.cemconres.2024.107586\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The reaction kinetics of silica fume in Portland cement binders directly affect porosity and strength development during the early and intermediate stages of hydration. This study sheds light on silica fume’s dissolution rate and mechanism at 23<!--> <!-->°C in a 0.1<!--> <!-->mol<!--> <!-->L<sup>-1</sup> KOH solution as a function of its composition, specific surface area, and saturation state. Conductivity measurements are used to continuously track the reaction progress and correlate it to dissolved concentration. The dependence of the dissolution rate on silica fume surface area and saturation state is described, and a rate equation consistent with standard chemical kinetics is developed to model the rates as a function of the thermodynamic driving force. The inferred rate equation can be used to improve models of microstructure evolution in blended cement binders.</p></div>\",\"PeriodicalId\":266,\"journal\":{\"name\":\"Cement and Concrete Research\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":10.9000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Cement and Concrete Research\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0008884624001674\",\"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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Cement and Concrete Research","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0008884624001674","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}
Dissolution kinetics of densified and undensified silica fume in a KOH solution at pH 13 and 23 °C
The reaction kinetics of silica fume in Portland cement binders directly affect porosity and strength development during the early and intermediate stages of hydration. This study sheds light on silica fume’s dissolution rate and mechanism at 23 °C in a 0.1 mol L-1 KOH solution as a function of its composition, specific surface area, and saturation state. Conductivity measurements are used to continuously track the reaction progress and correlate it to dissolved concentration. The dependence of the dissolution rate on silica fume surface area and saturation state is described, and a rate equation consistent with standard chemical kinetics is developed to model the rates as a function of the thermodynamic driving force. The inferred rate equation can be used to improve models of microstructure evolution in blended cement binders.
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.