{"title":"过氧化氢发泡水泥浆的产气和浆体膨胀行为","authors":"Wenjian Xie , Bing Chen , Hui Rong","doi":"10.1016/j.conbuildmat.2024.139006","DOIUrl":null,"url":null,"abstract":"<div><div>This study investigated the foaming behavior of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) foamed cement pastes, with a particular focus on gas production and slurry expansion processes. The effects of varying manganese dioxide (MnO<sub>2</sub>) dosage (0 %–2 %) and H<sub>2</sub>O<sub>2</sub> dosage (3 %–9 %) on the foaming process of fresh slurry and the properties of hardened specimens were examined. The findings revealed that gas production from H<sub>2</sub>O<sub>2</sub> decomposition followed pseudo-first-order kinetics, with a portion of the generated gas volume converting into slurry volume at lower reaction speeds. While higher H<sub>2</sub>O<sub>2</sub> dosages more effectively improved the final gas and slurry volume, increased MnO<sub>2</sub> dosages were more effective in accelerating the foaming process and thereby improving H<sub>2</sub>O<sub>2</sub> and gas utilization efficiency. Furthermore, higher MnO<sub>2</sub> dosages raised the first-order reaction rate constants of the gas production curves, whereas higher H<sub>2</sub>O<sub>2</sub> dosages had the opposite effect. Additionally, increased MnO<sub>2</sub> or H<sub>2</sub>O<sub>2</sub> dosages led to larger pore sizes and a reduction in dry density, compressive strength, and thermal conductivity. These findings underscore the significance of characterizing the foaming process and offer insights into the foaming mechanisms of cement pastes.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"454 ","pages":"Article 139006"},"PeriodicalIF":7.4000,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Gas production and slurry expansion behavior of hydrogen peroxide foamed cement pastes\",\"authors\":\"Wenjian Xie , Bing Chen , Hui Rong\",\"doi\":\"10.1016/j.conbuildmat.2024.139006\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study investigated the foaming behavior of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) foamed cement pastes, with a particular focus on gas production and slurry expansion processes. The effects of varying manganese dioxide (MnO<sub>2</sub>) dosage (0 %–2 %) and H<sub>2</sub>O<sub>2</sub> dosage (3 %–9 %) on the foaming process of fresh slurry and the properties of hardened specimens were examined. The findings revealed that gas production from H<sub>2</sub>O<sub>2</sub> decomposition followed pseudo-first-order kinetics, with a portion of the generated gas volume converting into slurry volume at lower reaction speeds. While higher H<sub>2</sub>O<sub>2</sub> dosages more effectively improved the final gas and slurry volume, increased MnO<sub>2</sub> dosages were more effective in accelerating the foaming process and thereby improving H<sub>2</sub>O<sub>2</sub> and gas utilization efficiency. Furthermore, higher MnO<sub>2</sub> dosages raised the first-order reaction rate constants of the gas production curves, whereas higher H<sub>2</sub>O<sub>2</sub> dosages had the opposite effect. Additionally, increased MnO<sub>2</sub> or H<sub>2</sub>O<sub>2</sub> dosages led to larger pore sizes and a reduction in dry density, compressive strength, and thermal conductivity. These findings underscore the significance of characterizing the foaming process and offer insights into the foaming mechanisms of cement pastes.</div></div>\",\"PeriodicalId\":288,\"journal\":{\"name\":\"Construction and Building Materials\",\"volume\":\"454 \",\"pages\":\"Article 139006\"},\"PeriodicalIF\":7.4000,\"publicationDate\":\"2024-11-12\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Construction and Building Materials\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0950061824041485\",\"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":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061824041485","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}
Gas production and slurry expansion behavior of hydrogen peroxide foamed cement pastes
This study investigated the foaming behavior of hydrogen peroxide (H2O2) foamed cement pastes, with a particular focus on gas production and slurry expansion processes. The effects of varying manganese dioxide (MnO2) dosage (0 %–2 %) and H2O2 dosage (3 %–9 %) on the foaming process of fresh slurry and the properties of hardened specimens were examined. The findings revealed that gas production from H2O2 decomposition followed pseudo-first-order kinetics, with a portion of the generated gas volume converting into slurry volume at lower reaction speeds. While higher H2O2 dosages more effectively improved the final gas and slurry volume, increased MnO2 dosages were more effective in accelerating the foaming process and thereby improving H2O2 and gas utilization efficiency. Furthermore, higher MnO2 dosages raised the first-order reaction rate constants of the gas production curves, whereas higher H2O2 dosages had the opposite effect. Additionally, increased MnO2 or H2O2 dosages led to larger pore sizes and a reduction in dry density, compressive strength, and thermal conductivity. These findings underscore the significance of characterizing the foaming process and offer insights into the foaming mechanisms of cement pastes.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.