The ability of SCMs to mitigate ASR in cements of higher alkali contents assessed by pore solution method
- Publisher:
- LABORATÓRIO NACIONAL DE ENGENHARIA CIVIL, I. P.
- Publication Type:
- Conference Proceeding
- Citation:
- Proceedings of the 16th International Conference on Alkali-Aggregate Reaction, 2021, 1, pp. 595-600
- Issue Date:
- 2021-01-01
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| Filename | Description | Size | |||
|---|---|---|---|---|---|
| ICAAR_16th_Proceedings_2022_Vol1_pp595-600 Tapas.pdf | Published version | 529.22 kB |
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This study reports on the efficacy of supplementary cementitious materials (SCMs) to mitigate ASR
when used in conjunction with cement of higher alkali contents (up to 1%Na2Oeq). The expansion of
concrete prisms immersed in simulated pore solution was studied in order to address the limitations of
conventional ASR testing methods AMBT and CPT. The alkali concentration in the simulated pore
solution was derived from the 28-day age pore solution of pastes with equivalent composition as the
concrete binder of interest. The concrete prisms were prepared using Australian sourced materials:
2 types of reactive aggregates (dacite and rhyolite), 2 types of SCMs (fly ash and slag) and cement with
0.6% Na2Oeq original alkali content that was boosted with alkali to obtain 1.0% Na2Oeq. The concrete
prisms were stored at 38 °C and at 60 °C. Expansion results show that 25% fly ash and 50% slag are
both sufficient to mitigate ASR even with cements with alkali content up to 1.0%Na2Oeq. Extensive
amount of ASR products were observed in concretes without SCMs. Small amount of ASR products
were also observed in concrete with SCMs, even if there was no notable expansion observed.
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