Silica glass interaction with calcium hydroxide: a surface chemistry approach |
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| Authors: | Lidia Armelao Arianna Bassan Renzo Bertoncello Guido Biscontin Sergio Daolio Antonella Glisenti |
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| Institution: | 1. Department of Chemistry, University of Genova, Via Dodecaneso 31, 16146 Genova, Italy;2. The Ames Laboratory, U.S. Department of Energy, Iowa State University, Ames, IA 50011-3020, USA;3. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011-2300, USA;4. Condensed Matter Physics & Material Science, T.I.F.R. Homi Bhabha Road, Mumbai 400 005, India;5. Department of Chemistry, Iowa State University, Ames, IA 50011-3111, USA;1. School of Medicine, Shimane University, Izumo, Shimane 693-8501, Japan;2. Graduate School of Science and Technology, Hirosaki University, Hirosaki 036-8561, Japan;1. State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment and Health, Ministry of Education, Key Laboratory of Environment and Health (Wuhan), Ministry of Environmental Protection, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, #13 Hangkong Road, Wuhan, Hubei 430030, China;2. Laboratory of BioSeparation, Institute of Clinical Chemistry, Medical Center of the University of Munich, Marchioninistr. 15, 81377 Munich, Germany;1. State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan 250353, China;2. School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China;3. Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Wuhan 430070, China;4. School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, and Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City, Southern University of Science and Technology, Shenzhen 518055, China;1. Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha 410082, China;2. Technische Universität München, Chair for Construction Chemistry, 85747 Garching, Lichtenbergstraße 4, Germany;3. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | The study of the interaction between silica glass and saturated Ca(OH)2 solutions can be a useful approach to resolve the problem of the adhesion between lime-sand mortar and clay bricks. Since it is reasonable that the silica–calcium hydroxide system well simulates a brick–mortar system, experimental observations concerning the interaction of silica glass and this strong basic solution should be of value for the comprehension of the chemical reactions that could take place at the mortar–brick interface, maybe affecting the adhesion between the two building materials. We demonstrated the effects of saturated Ca(OH)2 solutions on commercial pure silica glass (fused silica) and on silica films obtained via a sol–gel process by means of dip-coating. Silica samples were dipped in the solutions at different temperatures (room temperature, 60 and 80 °C) and at different time intervals (1 and 21 h) and then they were analysed by means of surface techniques: X-ray photoelectron spectroscopy (XPS), secondary ion mass spectrometry (SIMS) and atomic force microscopy (AFM). It has been shown that Ca(OH)2 reacts with the silica glass network. The experimental results clearly show a very different behaviour of sol–gel silica with respect to fused silica, probably because of their different nanostructure. Many problems concerning the interaction of silica and Ca(OH)2 are still to be solved, but the results of this research strengthen the idea that adhesion between lime-sand mortar and clay bricks is caused not only by carbonation of calcium hydroxide contained in the mortar, but even by some chemical reactions involving the brick constituents and calcium hydroxide itself. The final products, calcium silicates, may induce a chemical continuity between lime-sand mortar and clay bricks. |
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| Keywords: | lime mortar clay brick XPS analysis SIMS analysis AFM analysis sol– gel building materials |
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