Journal of Ceramic Science and Technology最新文献

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Methods for geopolymer formulation development and microstructural analysis 地聚合物配方开发及微观结构分析方法

IF 0.5 4区材料科学

Journal of Ceramic Science and Technology Pub Date : 1900-01-01 DOI: 10.4416/JCST2017-00065

A. Riessen, W. Rickard, Ross P. Williams, G. Riessen

{"title":"Methods for geopolymer formulation development and microstructural analysis","authors":"A. Riessen, W. Rickard, Ross P. Williams, G. Riessen","doi":"10.4416/JCST2017-00065","DOIUrl":"https://doi.org/10.4416/JCST2017-00065","url":null,"abstract":"Alkali-activated materials (AAMs) and geopolymers have been extensively studied, although widespread commercialisation has been hampered, in part, by the use of precursors that are rarely homogeneous and are generally poorly characterised. Even when precursors are well characterised, their extent of reaction during geopolymer synthesis is not well known, leading to a disparity between targeted and actual compositional ratios. Small variations in compositional ratios, particularly Si:Al, can lead to dramatic changes in physical properties. A process for characterising precursors, focussing on their reactive component, will be described here, followed by methods that can be used to determine the extent of reaction in the final product. Characterising the final product is important, but it does not reveal what processes occur between mixing the precursors and setting of the solid geopolymer. We will also describe a method that can be used to track dissolution of precursors and subsequent evolution of the alkali-activated product, thus providing a more comprehensive picture of geopolymerisation. This paper demonstrates a link between precursor characterisation and the extent of reaction in order to provide those working with alkali-activated materials with additional knowledge enabling them to manufacture reproducible, high-quality products.","PeriodicalId":48807,"journal":{"name":"Journal of Ceramic Science and Technology","volume":"37 1","pages":"421-431"},"PeriodicalIF":0.5,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70791391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Intumescent geopolymer-bound coatings for fire protection of steel 钢防火用膨胀型地聚合物结合涂料

IF 0.5 4区材料科学

Journal of Ceramic Science and Technology Pub Date : 1900-01-01 DOI: 10.4416/JCST2017-00035

M. Watolla, G. Gluth, P. Sturm, W. Rickard, S. Krüger, B. Schartel

{"title":"Intumescent geopolymer-bound coatings for fire protection of steel","authors":"M. Watolla, G. Gluth, P. Sturm, W. Rickard, S. Krüger, B. Schartel","doi":"10.4416/JCST2017-00035","DOIUrl":"https://doi.org/10.4416/JCST2017-00035","url":null,"abstract":"The passive fire protection of steel structures and other load-bearing components will continue to gain importance in future years. In the present contribution, novel intumescent aluminosilicate (geopolymer-bound) composites are proposed as fire-protective coatings on steel. Steel plates coated with these materials were exposed to the standard temperature-time curve as defined in ISO 834 – 1:1999. The coatings partially foamed during curing and expanded further during thermal exposure, demonstrating their intumescent characteristic.Thermogravimetryandoscillatory rheometry determined that the intumescent behavior is attributed to a transition to a viscous state (loss factor > 1) in the temperature range of major water release, differing from conventional geopolymers. XRD and SEM images showed that the coatings had characteristics of ceramic or glass-ceramic foams after fire resistance testing, suggesting superior performance under challenging conditions. The thickness of the coatings influenced their foaming and intumescent behavior and thus the time for the coated steel plates to reach 500 °C. A number of additives were also studied with the best performance obtained from samples containing sodium tetraborate.Acoating of just 6mmwas able to delay the time it takes for a steel substrate to reach 500 °C to more than 30 minutes.","PeriodicalId":48807,"journal":{"name":"Journal of Ceramic Science and Technology","volume":"8 1","pages":"351-364"},"PeriodicalIF":0.5,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70791614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 26

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