Alkali-aggregate reaction suppressed by chemical admixture at 80 °C |
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| Affiliation: | 1. Analysis and Testing Center, Nanjing Normal University, Nanjing 210097, PR China;2. College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, PR China;1. Department of Mechanical Engineering, Centre for Innovation and Technology in Composites – CITeC, University of São João del-Rei – UFSJ, Praça Frei Orlando, 170, São João del-Rei, Brazil;2. Federal Centre for Technological Education of Minas Gerais – CEFET/MG, Department of Civil Engineering, Belo Horizonte, Brazil;3. Advanced Composites Centre for Innovation and Science, University of Bristol, UK;1. Departamento de Estruturas Civis, Institutos Lactec, PO Box 19.067, CEP: 81.531-980, Curitiba, Paraná, Brazil;2. Universidade Federal do Paraná, Programa de Pós-Graduação em Engenharia e Ciências dos Materiais, UFPR-PIPE, Centro Politécnico da UFPR, POBox 19001, CEP: 81.531-980, Curitiba, Paraná, Brazil;3. Universidade Estadual de Ponta Grossa, Departamento de Engenharia de Materiais, LIMAC, Av. Carlos Cavalcanti, 4748, Uvaranas, Ponta Grossa, PR 84030-900, Brazil;4. Universidade Federal do Paraná, Departamento de Geologia, Centro Politécnico da UFPR, PO Box 19001, CEP: 81.531-980, Curitiba, Paraná, Brazil;5. Centrais Elétricas do Rio Jordão, José de Alencar St, 2021, CEP: 80040-070, Curitiba, Paraná, Brazil;1. School of Civil Engineering and Architecture, Jiangsu University of Science and Technology, Zhenjiang 212100, China;2. Department of Civil and Airport Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;3. Key Laboratory of Harbor and Marine Structure Durability Technology of the Ministry of Communications, CCCC Forth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China;4. School of Civil Engineering, University of Science and Technology Liaoning, Anshan 114051, China;1. Department of Civil Engineering, K?r?kkale University, K?r?kkale 71451, Turkey;2. Kaman Vocational School, Building Inspection, K?r?ehir Ahi Evran University, K?r?ehir 40360, Turkey;3. Department of Civil Engineering, Y?ld?r?m Beyaz?t University, Ankara 06050, Turkey;1. Department of Civil Engineering, Bu-Ali Sina University, Hamedan, Iran;2. Department of Engineering, Bu-Ali Sina University, Kaboodrahang, Hamedan, Iran |
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| Abstract: | More detailed researches of chemical admixture in inhibiting Alkali-aggregate reaction (AAR) at 80 °C curing condition were done in this paper. It seemed that AAR expansion could be long-term effectively inhibited by LiOH both at the alkali contents of 2.5% and 3.0%. In addition, there was some effect on AAR suppression of the alkali reactivity of the aggregate, the alkali content of the mortar and the added amount of the admixture. Firstly, the higher the alkali reactivity of the aggregate was, the better the inhibiting effect of LiOH showed. Secondly, to the mortars with the same aggregate, the inhibiting effect of LiOH with the same n(Li)/n(Na) molar ratio was improved with the augmentation of alkali content. Thirdly, when added to some extent, further augmentation of LiOH in mortar was not effective in increasing the AAR inhibition obviously. In the last, direct results of lithium compounds in suppressing AAR were found by SEM and EDS and the mechanism was discussed. |
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