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|Title:||Residual expansion capacity and degradation of mechanical properties in alkali-silica reaction (ASR) damaged concrete|
|Authors:||Ramsey, Monica A.|
Wood, Stephanie G.
Moser, Robert D.
Concrete--Expansion and contraction
|Publisher:||Geotechnical and Structures Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical Report (Engineer Research and Development Center (U.S.)) ; No. ERDC/GSL TR-19-11|
|Abstract:||The objective of this study was to develop methods to sample and test residual alkali-silica reaction-induced expansion capacity of in-situ concrete using cores tested in accelerated environments. The effect of alkali-silica reaction on the mechanical properties of concrete was also investigated in order to more accurately predict the remaining service life of existing concrete structures. Residual expansion measurements were taken up to 12 months on cores drilled from large concrete blocks produced with two different reactive aggregates and stored in various exposure conditions at different temperatures. The three exposure conditions were sealed, stored in NaOH solution, and stored over water. The four temperatures were 23, 38, 60, and 80⁰C. Compressive strength, splitting tensile strength, and modulus of elasticity were measured for cylinders immersed in NaOH at 80°C up to 56 days to generate correlations between ASR damage and mechanical properties. For unboosted cores, the 80°C modified conditioning regime appeared to be the most effective in producing significant residual expansion in a short period of time. Late-age conditioning had essentially no impact on the expansion of cores at one year. Modulus of elasticity was influenced most and was more accurately captured by delaying conditioning.|
|Gov't Doc #:||ERDC/GSL TR-19-11|
|Rights:||Approved for Public Release; Distribution is Unlimited|
|Appears in Collections:||Documents|