Deleterious alkali–silica reactivity in the laboratory and under field conditions
| Autor: | D. W. Hobbs |
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| Rok vydání: | 1993 |
| Předmět: | |
| Zdroj: | Magazine of Concrete Research. 45:103-112 |
| ISSN: | 1751-763X 0024-9831 |
| Popis: | Expansion test results are reported for concretes made with a range of original alkali contents and prepared a number of UK aggregates containing chert and flint. The concretes were subject to three exposure regimes: moist storage at 38°C, moist storage at 20°C, and external exposure. The current age of exposure for some of the concrete prisms stored at 20°C and some of the concrete blocks stored externally is 4·5 years. It is shown that original alkali contents above about 5·0 kg/m3 are necessary for deleterious expansion to result from alkali–silica reaction, and that concretes stored externally which have exhibited abnormal expansion within 4 years gave expansions in excess of 0·2% when stored moist at 38°C for one year. A model is presented which may enable the expansion behaviour of a number of the concretes tested under field conditions to be broadly predicted from the expansion measurements made in controlled tests on same concretes. |
| Databáze: | OpenAIRE |
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