Mitigation Effect of Waste Glass Powders on Alkali–Silica Reaction (ASR) Expansion in Cementitious Composite
| Autor: | George H. K. Wang, Yuelin Li, Guojun Ke, Wengui Li, Ruyi Li |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
0211 other engineering and technologies waste glass powder Ocean Engineering 02 engineering and technology pH value chemistry.chemical_compound mitigation 021105 building & construction lcsh:Systems of building construction. Including fireproof construction concrete construction lcsh:TH1000-1725 Civil and Structural Engineering Cement Calcium hydroxide Structural material Metallurgy 021001 nanoscience & nanotechnology chemistry Fly ash Particle Alkali–silica reaction alkali–silica reaction (ASR) expansion Particle size 0210 nano-technology cementitious composite Bar (unit) |
| Zdroj: | International Journal of Concrete Structures and Materials, Vol 12, Iss 1, Pp 1-14 (2018) |
| Popis: | © 2018, The Author(s). The effects of different contents and particle sizes of waste glass powder on alkali–silica reaction (ASR) expansion of cementitious composite bar were investigated in this study. Waste glass powder with particle size less than 300 μm exhibits an excellent mitigation effect on ASR expansion. With larger content and smaller particle size, the mitigation effect of waste glass powder on ASR expansion gradually increases. The mitigation effect of waste glass powder with particle size ranging from 38 to 53 μm and 20% by weight of cement seems relatively better than that of fly ash. When the waste glass powder content reaches 30%, the mitigation effect is still effective and almost the same as that of fly ash. However, the waste glass powder with particle size larger than 300 μm presents negative mitigation effect on ASR expansion when the replacement rate is larger than 30%. On the other hand, the waste glass powder and calcium hydroxide (CH) further react, and produce more calcium–silicate–hydrate gels, which apparently reduce the amount of CH. Moreover, the increasing content of waste glass powder results in a lower pH value in the pore solution of cementitious composite. |
| Databáze: | OpenAIRE |
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