Amir Behravan , Michael Lowry , Mehdi Ashraf-Khorasani , Thien Q. Tran , Xu Feng , Alexander S. Brand
{"title":"对再生沥青路面集料进行预处理以减少渗滤液对水泥水化的影响","authors":"Amir Behravan , Michael Lowry , Mehdi Ashraf-Khorasani , Thien Q. Tran , Xu Feng , Alexander S. Brand","doi":"10.1016/j.cemconres.2023.107305","DOIUrl":null,"url":null,"abstract":"<div><p><span>Many efforts have been made in recent years to justify the use of reclaimed asphalt pavement (RAP) aggregates in concrete. All previous efforts appear to unanimously report a reduction in concrete performance with varying proportions of RAP usage. The poor performance of RAP aggregates in concrete is attributed mainly to a larger, more porous </span>interfacial transition zone<span><span><span> (ITZ) and the cohesive failure of the asphalt. This study hypothesizes that the detrimental impact on the ITZ is attributable to organic compounds leached from the asphalt coating in the high pH </span>pore solution<span>. This study proves the presence of organic compounds in the pore solution and demonstrates that the leachates impair cement hydration. This study also attempted to pretreat the RAP in a </span></span>sodium<span><span> hydroxide (NaOH) solution to pre-leach the organic compounds. The pretreatment demonstrated that organic compounds were leached and that NaOH modified the asphalt surface chemistry. However, only a marginal improvement in </span>compressive strength was observed by completing a pretreatment.</span></span></p></div>","PeriodicalId":266,"journal":{"name":"Cement and Concrete Research","volume":"173 ","pages":"Article 107305"},"PeriodicalIF":10.9000,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effect of pretreatment on reclaimed asphalt pavement aggregates for minimizing the impact of leachate on cement hydration\",\"authors\":\"Amir Behravan , Michael Lowry , Mehdi Ashraf-Khorasani , Thien Q. Tran , Xu Feng , Alexander S. Brand\",\"doi\":\"10.1016/j.cemconres.2023.107305\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p><span>Many efforts have been made in recent years to justify the use of reclaimed asphalt pavement (RAP) aggregates in concrete. All previous efforts appear to unanimously report a reduction in concrete performance with varying proportions of RAP usage. The poor performance of RAP aggregates in concrete is attributed mainly to a larger, more porous </span>interfacial transition zone<span><span><span> (ITZ) and the cohesive failure of the asphalt. This study hypothesizes that the detrimental impact on the ITZ is attributable to organic compounds leached from the asphalt coating in the high pH </span>pore solution<span>. This study proves the presence of organic compounds in the pore solution and demonstrates that the leachates impair cement hydration. This study also attempted to pretreat the RAP in a </span></span>sodium<span><span> hydroxide (NaOH) solution to pre-leach the organic compounds. The pretreatment demonstrated that organic compounds were leached and that NaOH modified the asphalt surface chemistry. However, only a marginal improvement in </span>compressive strength was observed by completing a pretreatment.</span></span></p></div>\",\"PeriodicalId\":266,\"journal\":{\"name\":\"Cement and Concrete Research\",\"volume\":\"173 \",\"pages\":\"Article 107305\"},\"PeriodicalIF\":10.9000,\"publicationDate\":\"2023-11-01\",\"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/S0008884623002193\",\"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/S0008884623002193","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}
Effect of pretreatment on reclaimed asphalt pavement aggregates for minimizing the impact of leachate on cement hydration
Many efforts have been made in recent years to justify the use of reclaimed asphalt pavement (RAP) aggregates in concrete. All previous efforts appear to unanimously report a reduction in concrete performance with varying proportions of RAP usage. The poor performance of RAP aggregates in concrete is attributed mainly to a larger, more porous interfacial transition zone (ITZ) and the cohesive failure of the asphalt. This study hypothesizes that the detrimental impact on the ITZ is attributable to organic compounds leached from the asphalt coating in the high pH pore solution. This study proves the presence of organic compounds in the pore solution and demonstrates that the leachates impair cement hydration. This study also attempted to pretreat the RAP in a sodium hydroxide (NaOH) solution to pre-leach the organic compounds. The pretreatment demonstrated that organic compounds were leached and that NaOH modified the asphalt surface chemistry. However, only a marginal improvement in compressive strength was observed by completing a pretreatment.
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.