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Long-term testing of the chloride-penetration resistance of concrete containing high-reactivity metakaolin
This paper presents the long-term results of a study investigating the chloride penetration resistance of concrete containing high-reactivity metakaolin (HRM). The metakaolin evaluated in this study is a highly processed kaolinite clay that has been heat-treated under controlled conditions to produce high pozzolanic activity. Six concrete mixtures were cast with 0%, 8%, or 12% by mass replacement of portland cement with HRM at water-to-cementitious materials ratios (w/cm) of 0.30 or 0.40. The early age test results are summarized and include (1) strength, (2) 28-day and 90-day bulk diffusion, (3) rapid chloride permeability, and (4) resistivity. The long-term tests performed include bulk diffusion testing at 140 days, 1 year, and 3 years and chloride migration testing. It was found that strength increased at all ages with decreasing w/cm and increasing content of HRM. The results from all of the early-age experimental work showed that higher metakaolin content and lower w/cm decreased diffusion, permeability, and conductivity and increased resistivity. Resistance to chloride migration increased with increasing metakaolin content and decreasing w/cm. The long-term bulk diffusion testing showed a continued improvement in chloride resistance for all of the mixtures.
Long-term testing of the chloride-penetration resistance of concrete containing high-reactivity metakaolin
This paper presents the long-term results of a study investigating the chloride penetration resistance of concrete containing high-reactivity metakaolin (HRM). The metakaolin evaluated in this study is a highly processed kaolinite clay that has been heat-treated under controlled conditions to produce high pozzolanic activity. Six concrete mixtures were cast with 0%, 8%, or 12% by mass replacement of portland cement with HRM at water-to-cementitious materials ratios (w/cm) of 0.30 or 0.40. The early age test results are summarized and include (1) strength, (2) 28-day and 90-day bulk diffusion, (3) rapid chloride permeability, and (4) resistivity. The long-term tests performed include bulk diffusion testing at 140 days, 1 year, and 3 years and chloride migration testing. It was found that strength increased at all ages with decreasing w/cm and increasing content of HRM. The results from all of the early-age experimental work showed that higher metakaolin content and lower w/cm decreased diffusion, permeability, and conductivity and increased resistivity. Resistance to chloride migration increased with increasing metakaolin content and decreasing w/cm. The long-term bulk diffusion testing showed a continued improvement in chloride resistance for all of the mixtures.
Long-term testing of the chloride-penetration resistance of concrete containing high-reactivity metakaolin
Boddy, A. (author) / Hooton, R.D. (author) / Gruber, K.A. (author)
Cement and Concrete Research ; 31 ; 759-765
2001
7 Seiten, 21 Quellen
Article (Journal)
English
| British Library Online Contents | 2001
The Chloride Penetration Resistance of Concrete Containing High-Reactivity Metakaolin
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