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Preventive Measures on Alkali-Silica Reaction of Crushed Stones
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 Title & Authors
Preventive Measures on Alkali-Silica Reaction of Crushed Stones
Jun Ssang-Sun; Lee Hyo-Min; Seo Ki-Young; Hwang Jin-Yeon; Jin Chi-Sub;
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 Abstract
In Korea, due to the insufficiency of natural aggregates and increasing needs of crushed stones, it is necessary to examine the alkali-silica reaction of the crushed stones. The reaction produces an alkali-silica reaction gel which can imbibe pore solution and swell to generate cracks that are visible In affected concrete. In general, crushed stones are tested by petrograptuc examination, chemical method and mortar-bar method, but the most reliable method Is mortar-bar test. This study tested alkali-silica reactivity of crushed stones of various rock types using ASTM C 227 and C 1260, and compared the results of two test methods. This study also analyzed effects of particle size and grading of reactive aggregate on alkali-silica reaction expansion of mortar-bar. The effectiveness of mineral admixtures to reduce detrimental expansion caused by alkali-silica reaction was investigated through the ASTM C 1260 method. The mineral admixtures used were nv ash, silica fume, metakaolin and ground granulated blast furnace slag. The replacement ratios of 0, 5, 10, 15, 25 and were commonly applied for all the mineral admixtures and the replacement ratios of 45 and were additional applied for the admixtures that could maintain workability. The results indicate that replacement ratios of for ay ash, for silica fume, for metakaolin or for ground granulated blast furnace slag were most effective to reduce alkali-silica reaction expansion under the experimental conditions.
 Keywords
crushed stone;alkali-silica reaction;fly ash;silica fume;metakaolin;
 Language
Korean
 Cited by
1.
알칼리-실리카 반응에 의한 모르타르 봉의 SEM과 EPMA 분석을 통한 미세구조 연구,전쌍순;이효민;진치섭;

한국콘크리트학회논문집, 2009. vol.21. 4, pp.531-537 crossref(new window)
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