Document Type

Conference Paper

Publication Date


Publication Details

Shima Entezam, Behshad Jodeiri Shokri, Hadi Nourizadeh, Amin Motallebiyan, Ali Mirzaghorbanali, Kevin McDougall, Naj Aziz and Karu Karunasena, Investigation of the effect of using fly ash in the grout mixture on performing the fully grouted rock bolt systems, Proceedings of the 2023 Resource Operators Conference, University of Wollongong - Mining Engineering, February 2023, 296-301.


This paper attempts to reveal the influence of using fly ash in the grout on the axial bearing capacity of fully grouted rock bolts. For this purpose, different fly ash contents, including 1% and 2%, have been applied with Stratabinder HS with a water-to-grout ratio of 30%. Also, after preparing and curing the required samples, the UCS tests were conducted to determine the influence of fly ash on the grout strength. Along with the UCS tests, several pull-out tests were examined by preparing and curing rock bolt samples with steel reinforcement rebars of 16 mm and steel pipes with a 50 mm length and 23 mm diameter. The results revealed that replacing a small amount of grout with fly ash could increase the strength of the grout. Also, the axial bearing capacity has risen by using fly ash in the grout mixture.