• Magazine of the Korea Concrete Institute
• /
• v.6 no.2
• /
• pp.108-117
• /
• 1994

This study was performed to investigate the Alkali-Silica Reaction(ASR) of crushed stones using chemical analysis, polarization microscope, XRD, chemical method(KS F 2545, ASTM C 289), mortar-bar method( KS F 2546, ASTM C 227) and Scanning Electron Microscope (SEM ) and Energy Dispersive X-ray Analysis(EDXA) of reaction products by ASK in the mortar bars and to investigate the influence on alkali content and kind of added alkali to the ASR. Test results show that one kind of domestic crushed stone is estimated as deleterious by ASTM chemical method and mortar bar method, and reaction product is proved as alkali silicate gel by EDXA.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2009.05a
• /
• pp.255-256
• /
• 2009

This purpose of this study was to evaluate the controlling effect of alkali-aggregate reactivity using mineral admixtures for aggregates in Korea according to test methods: chemical test by KS F 2545; mortar bar test by KS F 2546; accelerated mortar bat test by ASTM C 1260.

• Cement
• /
• s.187
• /
• pp.45-48
• /
• 2010

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.04a
• /
• pp.172-173
• /
• 2022

Rough stones of aggregates used as concrete aggregates for 6 regions in Korea were sampled and the reactivity of alkali aggregates was analyzed using chemical analysis method and mortar rod method.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.11a
• /
• pp.765-768
• /
• 2008

The prevent methods of Alkali-Silica Reaction (ASR) are studying after the failure cases by ASR were reported in Korea. When ASR failure is causing to the step of maintenance, the available repair methods were rarely studied in the World. In this study, premixed fly ash cement was applied to prevent ASR in the concrete pavement. The ratio of fly ash and cement is 20 percent and 80 percent by weight of total cementious material. The construction performance of premixed fly ash cementious concrete pavement was studied that the application is verify to performance collected data during the constructing in the field. The freeze-thaw test was studied to verify durability of the premixed fly ash cementious material made specimen in the laboratory. The results show that construction performance and durability are well condition in this test section and freeze-thaw test.

• Cement
• /
• s.98
• /
• pp.23-28
• /
• 1985

• Cement
• /
• s.108
• /
• pp.20-29
• /
• 1987

• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.323-324
• /
• 2010

The purpose of this study was to investigate alkali-silica reaction of accelerating agents in shotcrete. The test was performed with accelerating agents (aluminate, alkali-free, cement based mineral admixture) in the Type I cement. As a test result, using the nonreactive aggregates, detrimental expansion due to alkali-silica reaction doesn't occurred regardless of equivalent alkali contents of accelerating agent.

• Proceedings of the Korea Concrete Institute Conference
• /
• 1993.10a
• /
• pp.103-107
• /
• 1993

The Alkali Aggregate Reaction(AAR), reported first by T. E. Stanton in 1940, is a reaction between certain siliceous aggregate and hydroxyl ions present in the pore fluid of a concrete. The damage of concrete structures, deteriorated by AAR, have been reported since using the crushed stones caused by the exhaustion of natural aggregates. This study was performed to investigate the AAR of crushed stones using chemical analysis, polarization microscope, XRD, chemical method(KS F 2545, ASTM C 289), mortar bar method(KS F 2546, ASTM C 227) and Scanning Electron Microscope(SEM) and Energy Dispersive X-ray Analysis (EDXA) of reaction products by AAR in mortar bar.

• International Journal of Highway Engineering
• /
• v.13 no.3
• /
• pp.1-6
• /
• 2011

The possibility of ASR(alkali-silica reaction) for coarse aggregates had known to be low up to recently in Korea. But the distress of ASR was identified and reported by ASTM C 1260 test. The purpose of this paper was to identify the effect of environmental conditions on length expansion of mortar-bar by alkali-silica reaction with KS F 2546 and ASTM C 1260 test. The results of this study were as following; The result of KS F 2546 test for five kinds of aggregates shows that all of them are non-reactive. But that of ASTM C 1260 test shows that all of aggregates except Andesite-2 are over possible reactive because of environmental condition such as external alkali ion by 1N NaOH, high temperature and humidity. The result of variety of NaOH concentration on ASTM C 1260 using Siltstone indicates that length expansion rate increases highly as NaOH concentration increases. And, comparison results of KS F 2546 for Siltstone with that of 0.00N NaOH experiment indicates that length expansion rate increases as temperature and humidity increases.