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Concrete Properties and Relationship Between Surface Strain and Strain Over the Steel Bars of ASR Affected Concrete Members
Publication year | Port and Airport Research Institute Report 042-02-06 2003.06 |
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Author(s) | Tarek Uddin MOHAMMED,Hidenori HAMADA,Toru YAMAJI |
Department /Divison |
Geotechnical and Structural Engineering Department Materials Group |
Executive Summary | A detailed experimental investigation was carried out to understand the change in mechanical properties of concrete, surface strain over the specimens and the steel bars embedded in concrete, crack growth, and change in mechanical properties of steel bars under sustained stress induced by the alkali-silica reaction (ASR) in concrete.Also, chloride diffusion in concrete, corrosion over the steel bars, investigation on ASR gel at the porous matrix region by SEM, and visual examination of the ASR gel on the cut surface of the specimens were carried out. For this, beam specimens of size 250 x 250 x 600 mm and cylinder specimens of diameter 100 mm and length 200 mm were made. Beam specimens were made with and without reinforcements. Various restrained conditions by the reinforcement were provided. Additional NaOH was added to raise the total Na2O equivalent alkali content to 6 kg/m3 in concrete. The specimens were submerged in seawater at a temperature of 40°C in a closed container. The investigation was carried out for 383 days. |
PDF File | /en/pdf/en/vol042-no02-06.pdf |