Investigation of ASR in Mass Concrete Structures: A Case Study

Sujjavanich, Suvimol; Suwanvitaya, Prasert; Rothstein, David M.

doi:10.3850/978-981-08-7920-4_s3-m040-cd

Cited by 6 publications

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“…The first evidence of alkali-silica reaction (ASR) in Thailand was found in one large infrastructure in 2009 and reported by Sujjavanich et al in 2011 [1]. The confirmed problematic rocks were black quartzite with traces of pyrite, mica and sericite.…”

Section: Introductionmentioning

confidence: 95%

Investigation of Potential Alkali-Silica Reactivity of Aggregate Sources in Thailand

Sujjavanich¹

2017

GEOMATE

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ABSTRACT:Since the first local evidence of alkali-silica reaction (ASR) was reported in Thailand in 2011, awareness of ASR was raised and the importance of aggregate performance database was recognized, thus an attempt to set up local aggregate database was initiated. As part of the effort to establish the database, a study of potential ASR reactivities was carried out involving aggregates from several current industrial sources in eastern and central Thailand and the results were presented here. Aggregate samples were randomly collected from various sources and tested by two methods; accelerated mortar-bar test (AMBT) and petrographic examination. The types of aggregate sampled included limestone, greywacke, and rhyolitic tuff. The AMBT expansion results indicated that several aggregate types had larger expansion than the threshold of potentially deleterious ASR behavior as suggested by ASTM C 1260 standard. Furthermore, it was found that samples of same aggregate type, although apparently had mineralogically similar compositions, had different reactivities, particularly when sampled from around geological fault zone compared with that taken from the surrounding area and portions of parent rock were observed to be weathered in this area. Thin section analysis revealed evidence of ASR gel at the aggregates' rim, inside the aggregates and in the matrix. These findings suggest possible future ASR problems in Thailand as well as in neighboring countries where the continuity of geology pattern is observed.

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Section: Introductionmentioning

confidence: 95%

Investigation of Potential Alkali-Silica Reactivity of Aggregate Sources in Thailand

Sujjavanich¹

2017

GEOMATE

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“…The first report [11] on ASR occurrence in Thailand raised the concern on the lack of information on local materials, their behaviors in concrete and the measures for mitigation and prevention. Several sources of aggregate with ASR problem have been found locally, suggesting continuing ASR problems into the future [12].…”

Section: Introductionmentioning

confidence: 99%

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2020

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The effect of different local pozzolans, as a supplementary cementitious material (SCM), on the expansion of mortar bar due to Alkali Silica Reaction (ASR) were reported in this paper. Accelerated test on specimens using local volcanic aggregates, rhyolite, was used to investigate and to compare the effects of fly ash (FA) and metakaolin (MK) on the suppression of the length change. In this study, three different percentages of FA, namely, 20, 35 and 50 and three of MK, namely, 10, 15 and 20 were used as cement replacement. The results at 14 days showed slight decrease expansions for 20% FA replacement of 0.073% but the lowest expansions were 0.025% and-0.001%, respectively for 35% FA and 10% MK, compared to 0.176 % of the control mix. Increase the SCMs to 50% FA and 15-20% MK yielded reduction of expansion to the innocuous level. Results from 28 days acceleration registered a slight increase in expansion for FA mixes of 35 and 50% and all MK mixes, but still less than 0.10%, the threshold for innocuous level. Chemical composition analysis revealed decrease in CaO/SiO2 and CaO/Al2O3 ratio of the cementitious systems. This correlated with the expansion reduction. But alumina in Al2O3/SiO2 ratio showed the dominant effect on ASR suppression. Microstructures of all materials and casted specimens were also studied in detail. Considering all aspects, these SCMs, used in suitable amount were considered good candidates for ASR prevention in new concrete structures for both short and long term

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“…The first ASR-related problem in Thailand in the mass foundation of a large infrastructure project was reported in 2009 [7,8]. During the first 10 years of service visual inspections reported extensive cracks of about 20% of the surveyed footings and the continued expansion in the mass foundations.…”

Section: Introductionmentioning

confidence: 99%

“…During the first 10 years of service visual inspections reported extensive cracks of about 20% of the surveyed footings and the continued expansion in the mass foundations. The typical grid pattern cracks of about 0.50 m apart, accompanied by randomly finer cracks [7]. Several causes of distress were eliminated and finally, the two most suspicious causes, namely ASR and DEF or Delayed Ettringite Formation, were focused on and that led to a detailed investigation to confirm the root cause of the problem.…”

Section: Introductionmentioning

confidence: 99%

Assessment Techniques for Alkali-Silica Reaction Diagnosis in Mass Concrete Structure

Sujjavanich¹

2019

GEOMATE

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This paper reported the results of several techniques used to diagnose Alkali-Silica Reaction (ASR) distress in concrete. Two screening tests looked for the appearance of the fluoresced gel of uranyl acetate treated samples and the changed color areas of the chemical staining treated samples. The results agreed well with the expansion of the cored samples in warm water and in NaOH solution and also supported the previously measured expansion in the field. The petrographic analysis found many microcracks with ASR gel filling in cement paste, interface zone (ITZ) between aggregates and paste, and internal cracks in aggregates. Microstructural analysis revealed the characteristics of slow reactive aggregates and two forms of products; amorphous gel with shrinkage cracks in cement paste cracks and in the ITZ, and cryptocrystalline reaction products consisting of plate-formed crystals, rosettes and globular found mostly in internal cracks of aggregates and air voids. The SEM/EDS analysis differentiate reactive from non-reactive aggregates. Ettringite crystals were also observed lining the air voids and some cracks but there was no evidence linking it to the cause of continued expansion. Fine grain black quartzite within the aggregates and sericite were identified as the cause of ASR The combination of different techniques effectively identified ASR as the primary cause of deterioration and the continued expansion of the investigated structure.

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Investigation of ASR in Mass Concrete Structures: A Case Study

Cited by 6 publications

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Investigation of Potential Alkali-Silica Reactivity of Aggregate Sources in Thailand

Investigation of Potential Alkali-Silica Reactivity of Aggregate Sources in Thailand

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Assessment Techniques for Alkali-Silica Reaction Diagnosis in Mass Concrete Structure

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