Title: Carbonation of Mortar with Alkali-Silica Reactions

Author(s): Chun-Tao Chen, Wei-Cheng Yang, and Chin-Wei Hsu

Publication: Symposium Paper

Volume: 326

Issue:

Appears on pages(s): 81.1-81.6

Keywords: alkali-silica reaction (ASR); carbonation; expansion; limestone addition; durability; mortar

DOI: 10.14359/51711064

Date: 8/10/2018

Abstract:
This study explores the composite deteriorations between the alkali-silica reaction (ASR) and the carbonation. During the study, mortar specimens were prepared using Pyrex glass at two water-cement ratios of 0.47 and 0.6 and cured in air at the temperature of 23 °C and relative humidity of 50% for one day. To accelerate the ASR, the specimens were subjected to the 80°C NaOH solution, and the length changes were measured daily. To accelerate the carbonation, the specimens were oven-dried for one day and then subjected to 50% CO2 at the relative humidity of 70%. Results showed that the carbonation before the ASR mitigated the expansion because of the reduced alkalis in the specimens. When the accelerated carbonation was applied to the specimen after its initiation of ASR, the carbonation time to inhibit the expansion was increased. The cycling ASR and carbonation showed apparent inhibition of expansion even though the carbonation time was short.