- Author
-
Ferraris, C. F.
|
Garboczi, E. J.
|
Davis, F. L.
|
Clifton, J. R.
- Title
- Effect of Stress Relaxation, Self-Desiccation, and Water Absorption on the Alkali-Silica Reaction in Low Water/Cement Ratio Mortars.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
- Journal
-
Cement and Concrete Research,
Vol. 27,
No. 10,
1553-1560,
1997
- Keywords
-
mortars
|
stress (mechanics)
|
water
|
cements
- Identifiers
- Alkali-Silica Reaction (ASR)
- Abstract
- A device has been designed and tested for measuring the stress caused by the alkali-silica reaction (ASR) in mortars. Specimens were placed in a frame equipped with a load cell, allowing us to approximately fix the strain at zero and measure the total stress generated over time. The specimens and the frame were immersed in a 1-N NaOH solution at 50 deg C. Even without ASR, the specimens expanded due to water absorption that relieves the shrinkage caused by self-desiccation. In addition, applied stresses, as well stresses that were set up in the sample by expansion caused by ASR and/or water absorption, were subject to stress relaxation. By using companion samples having nonreactive aggregates, we were able to distinguish the stress caused by ASR from that caused by water absorption-driven expansion. The effects of stress relaxation could not be removed without further experimentation and theoretical analysis.