For exploring the behaviour of alkali-aggregate reactivity (AAR) in alkali-activated geopolymeric materials and
assessing the procedures for testing AAR in geopolymers, the expansion behaviour of fly ash based geopolymer mortars
with pure silica glass and typical carbonate rocks were studied respectively by curing at various conditions, i.e. 23°C and
38°C with relative humidity over 95%, immersed in 1M NaOH solution at 80°C. Results show that, at various curing
conditions, neither harmful ASR nor harmful ACR was observed in geopolymers with the criteria specified for OPC
system. However, with the change of curing conditions, the geopolymer binder and reactive aggregates may experience
different reaction processes leading to quite different dimensional changes, especially with additional alkalis and
elevated temperatures. It suggests that high temperature with additional alkali for accelerating AAR in traditional OPC
system may not appropriate for assessing the alkali-aggregate reactivity behaviour in geopolymers designed for normal
conditions. On the other hand, it is hopeful to control the dimensional change of geopolymer mortar or concrete by
selecting the type of aggregates and the appropriate curing conditions, thus changing the harmful AAR in OPC into
beneficial AAR in geopolymers and other alkali-activated cementitious systems.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.