{"title":"测量离析后张法灌浆料中的硫酸根离子浓度","authors":"Samanbar Permeh , Kingsley Lau , Ron Simmons","doi":"10.1016/j.cement.2024.100093","DOIUrl":null,"url":null,"abstract":"<div><p>Corrosion of steel strand embedded in deficient grout has been associated with elevated concentrations of sulfate ions stemming from grout segregation and the adverse influences of excess mix water and grout prehydration. There have been discussions about appropriate ways to assess sulfate ion levels in the grout pore water. Various test methodologies can include varying material conditioning procedures, including heating, drying, and chemical reactions that can influence the level of sulfate ion aggregation in the test leachate from the initial bleed water from the bulk material. In this study, the sulfate content was measured by leaching and alternative methods such as XRF and bleed water testing. Six leaching methods were employed to assess the effect of leaching heating, heating time, leaching volume, grout sample mass, and drying temperature. Leaching of larger grout sample mass can yield higher leachate sulfate concentrations, but the concentrations were not commensurate with the larger grout mass. Leaching of a larger grout sample mass with a mass-to-water ratio of 1:10 was not shown to be efficient in the dissolution of sulfate ions. Larger mass-to-water ratio (1:40) yielded higher sulfate concentrations in the leachate and normalized grout mass. Pre-drying of grout samples to 100 °C for 24 h was shown to incur losses in sulfate content. Recommendations of test methods to assess the sulfate ion content from segregated and hardened grout were made.</p></div>","PeriodicalId":100225,"journal":{"name":"CEMENT","volume":"15 ","pages":"Article 100093"},"PeriodicalIF":0.0000,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666549224000021/pdfft?md5=9e041d082af362b288c129e425f80718&pid=1-s2.0-S2666549224000021-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Measurement of sulfate ion concentration in segregated post-tension grout\",\"authors\":\"Samanbar Permeh , Kingsley Lau , Ron Simmons\",\"doi\":\"10.1016/j.cement.2024.100093\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Corrosion of steel strand embedded in deficient grout has been associated with elevated concentrations of sulfate ions stemming from grout segregation and the adverse influences of excess mix water and grout prehydration. There have been discussions about appropriate ways to assess sulfate ion levels in the grout pore water. Various test methodologies can include varying material conditioning procedures, including heating, drying, and chemical reactions that can influence the level of sulfate ion aggregation in the test leachate from the initial bleed water from the bulk material. In this study, the sulfate content was measured by leaching and alternative methods such as XRF and bleed water testing. Six leaching methods were employed to assess the effect of leaching heating, heating time, leaching volume, grout sample mass, and drying temperature. Leaching of larger grout sample mass can yield higher leachate sulfate concentrations, but the concentrations were not commensurate with the larger grout mass. Leaching of a larger grout sample mass with a mass-to-water ratio of 1:10 was not shown to be efficient in the dissolution of sulfate ions. Larger mass-to-water ratio (1:40) yielded higher sulfate concentrations in the leachate and normalized grout mass. Pre-drying of grout samples to 100 °C for 24 h was shown to incur losses in sulfate content. Recommendations of test methods to assess the sulfate ion content from segregated and hardened grout were made.</p></div>\",\"PeriodicalId\":100225,\"journal\":{\"name\":\"CEMENT\",\"volume\":\"15 \",\"pages\":\"Article 100093\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-02-17\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S2666549224000021/pdfft?md5=9e041d082af362b288c129e425f80718&pid=1-s2.0-S2666549224000021-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"CEMENT\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2666549224000021\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"CEMENT","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2666549224000021","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
摘要
嵌入缺损灌浆料中的钢绞线的腐蚀与灌浆料离析引起的硫酸根离子浓度升高以及过量混合水和灌浆料预水的不利影响有关。人们一直在讨论评估灌浆料孔隙水中硫酸根离子含量的适当方法。各种测试方法可能包括不同的材料调节程序,包括加热、干燥和化学反应,这些都会影响试验浸出液中硫酸根离子从散装材料的初始渗出水中聚集的程度。在本研究中,硫酸盐含量是通过浸出法和 XRF 等替代方法以及渗滤水测试来测量的。采用了六种浸出方法来评估浸出加热、加热时间、浸出量、灌浆料样品质量和干燥温度的影响。沥滤较大的灌浆料样品质量可产生较高的沥滤液硫酸盐浓度,但浓度与较大的灌浆料质量不相称。对质量水比为 1:10 的较大灌浆料样品进行沥滤时,硫酸根离子的溶解效率并不高。质量与水的比例越大(1:40),浸出液和归一化灌浆料质量中的硫酸盐浓度就越高。结果表明,将灌浆料样品预先干燥至 100 °C 24 小时会导致硫酸盐含量的损失。对评估离析和硬化灌浆料中硫酸根离子含量的测试方法提出了建议。
Measurement of sulfate ion concentration in segregated post-tension grout
Corrosion of steel strand embedded in deficient grout has been associated with elevated concentrations of sulfate ions stemming from grout segregation and the adverse influences of excess mix water and grout prehydration. There have been discussions about appropriate ways to assess sulfate ion levels in the grout pore water. Various test methodologies can include varying material conditioning procedures, including heating, drying, and chemical reactions that can influence the level of sulfate ion aggregation in the test leachate from the initial bleed water from the bulk material. In this study, the sulfate content was measured by leaching and alternative methods such as XRF and bleed water testing. Six leaching methods were employed to assess the effect of leaching heating, heating time, leaching volume, grout sample mass, and drying temperature. Leaching of larger grout sample mass can yield higher leachate sulfate concentrations, but the concentrations were not commensurate with the larger grout mass. Leaching of a larger grout sample mass with a mass-to-water ratio of 1:10 was not shown to be efficient in the dissolution of sulfate ions. Larger mass-to-water ratio (1:40) yielded higher sulfate concentrations in the leachate and normalized grout mass. Pre-drying of grout samples to 100 °C for 24 h was shown to incur losses in sulfate content. Recommendations of test methods to assess the sulfate ion content from segregated and hardened grout were made.