Open AccessCompressive strength and workability of high calcium one-part alkali activated mortars using response surface methodology
Author(s) -
Sani Haruna,
Bashar S. Mohammed,
Mohamed Mubarak Abdul Wahab,
Ahmed Abba Haruna
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/476/1/012018
Subject(s) - compressive strength , mortar , curing (chemistry) , anhydrous , fly ash , materials science , geopolymer , composite material , alkali metal , cement , chemistry , organic chemistry
In this present experimental study, high calcium fly ash was utilized in the production of one-part alkali activated mortars. The HCFA was activated with anhydrous sodium metasilicate powder at 10 – 20 percent of the total precursor materials and cured at ambient condition. In this study, granular anhydrous sodium metasilicate has been successfully utilized to produce one-part alkali activated mortars. Thirteen mixes of one-part geopolymer mortar were designed using RSM central composite design with percentage of alkali activator and w/b ratios as parameters. Hardened density, workability, and, compressive strength was envisaged. The results showed that increasing the granular activator beyond 15% by weight of the fly ash reduces the strength and workability of the one-part alkali activated mortars. The RSM investigation helped in advancing the level of granular activator as far as acquiring ideal qualities and they were observed to be ideal at 16% of the granular activator and 0.3 w/b proportion. The model conditions were created, and the outcomes were approved through ANOVA by witnessing the model noteworthiness level of more than 95%. One-part alkali activated mortars exhibited highest compressive strength of almost 40 MPa at 28 days curing. The density of the one-part geopolymer mortars is almost the same regardless of the mixes.