| dc.description.abstract | significant carbon emissions. Advancing concrete technology places geopolymer
concrete as a potential green concrete by completely replacing Ordinary Portland
Cement. However, the geopolymerization process is initiated at elevated temperatures,
which demands that curing at elevated temperatures be conducted for several hours,
limiting its application. Calcium ions in Geopolymer concrete (GPC) allow the formation
of Calcium Aluminate Silicate and Calcium Silicate Hydrate gels, allowing ambient
temperature curing. To study the effect of micro lime on the engineering properties of
ambient temperature-cured sugarcane bagasse ash-based GPC, this research used
Sugarcane Bagasse Ash (SCBA) as source material; one part of sodium Hydroxide 16M
solution and two parts of sodium silicate were used as the alkaline activator. Crushed
stones and river sand were utilized as the coarse and fine aggregates, respectively. A
sodium naphthalene formaldehyde (SNF) based superplasticizer was added at 3% of the
SCBA. Micro lime was added as an admixture in varying proportions as a percentage
weight of SCBA. In the fresh state, it was found that the workability decreased with the
increase of micro lime content. The ambient temperature curing of the SCBA-based GPC
was achieved at a 1% addition of the micro lime. The SCBA-based GPC's compressive
strength increased with the micro lime increase, up to 7%. The ambient temperature
cured SCBA-based GPC at 3% had the best water absorption resistance. The SCBA
based GPC had no significant weight loss on 2.5% sulfuric acid exposure. The 5 and 7%
micro lime mix had no significant change in compressive strength under the condition of
sulfuric acid, unlike the 0,1 and 3%. The results from this research contribute to the body
of knowledge on ambient temperature-cured SCBA-based geopolymer concrete. It
reveals the possibility of expanding the applications of GPC made from the locally
available source material, SCBA. | en_US |
