Title:
Assessment of Aggregate Reactivity Using an Ultra-Rapid Autoclave Test Method
Author(s):
Stephanie Wood
Publication:
Web Session
Volume:
ws_F23_StephanieWood.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/29/2023
Abstract:
Alkali-silica reaction (ASR) occurs in concrete that contains silica in a reactive aggregate, sufficient alkalis, and sufficient moisture. The most widely accepted tests for evaluating ASR potential have unique limitations. Because of the need to test concrete mixes within a short period of time, an ultra-accelerated autoclave test method (ACPT) was investigated using an exposure temperature of 133°C temperature with a corresponding pressure of 0.2 MPa over 24 hours to expose prism samples boosted to a 3% total alkali content. A suite of aggregates 150 specimens was evaluated using both the ACPT and CPT methods. The ACPT was able to classify the aggregates for ASR reactivity with 97.2 percent accuracy for the proposed limit of 0.09 percent expansion for 36 tested mixtures and approximately 130 specimens.