Abstract
Effect of modified zeolite (MZ) on the ASR expansion was analyzed, and comparison between MZ and other mineral admixtures such as fly ash and ground blast furnace slag was made according to ASTM C441. It is shown that the modified zeolite derived from immersion of natural zeolite(NZ) in 2 N NH 4Cl solution might decrease the concentration of soluble alkalis in pore solution more effectively, as the alkali ions could be exchanged by NH 4 + existed in MZ with formation of NH 3·H 2O, as a result, the expansion due to alkali-silica reaction (ASR) was controlled consequently. In ASTM C441 test, the 14-day expansion of the specimen incorporating 5% of MZ was less than 0.1%, while the percentage of the fly ash and blast furnace slag with the same efficiency was about 25% and 40%, respectively. Physical properties of cement incorporating 5% of MZ, such as normal consistency, setting time, bending and compressive strength also met the requirement of the Chinese national standard.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
