Janice B. Jamora, Sarah Emily L. Gudia, Roxanne G. Juanir, Chintya Gunarto, Marnie B. Giduquio, Alchris Woo Go
The effects of class-F coal fly ash (CFA) as cement replacement in the paste and mortar formulation at different CFA-to-binder ratios (CBR) with varying water-to-binder ratios (WBR) were investigated and further evaluated using multivariate nonlinear regression to elucidate their influence on consistency, setting time, and water requirement. It was found that the required WBR for achieving normal consistency of formulated paste and mortar can be predicted using the obtained regression models. Water requirements for mortar formulation could also be predicted, given that the water requirement for paste formulation is known. The influence of partially replacing cement in mortar formulations on hardened mortar properties while ensuring formulations were at normal consistency was also investigated with replacements of up to 20 wt.% resulted in a mortar with improved strength, especially after curing for 28 and 56 days, as the CFA exhibits its inherent pozzolanic activity. © 2024 Informa UK Limited, trading as Taylor & Francis Group.
Department of Civil Engineering, University of San Carlos, Talamban, Cebu, Philippines; School of Engineering, University of San Carlos, Talamban, Cebu, Philippines; Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Surabaya, Indonesia; Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan