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A platform for research: civil engineering, architecture and urbanism
Partial cement replacement by different sugar cane bagasse ashes: Hydration-related properties, compressive strength and autogenous shrinkage
Graphical abstract Display Omitted
Highlights Autogenous shrinkage of SCBA was assessed. Three completely different SCBA samples were compared. All mortars with pozzolan presented higher shrinkage than that of reference. Hydration of pastes was studied by isothermal calorimetry, chem. shrinkage and XRD. SCBA samples were compared with a pozzolanic RHA.
Abstract Assuming that the pozzolanicity of sugar cane bagasse ash (SCBA) is strongly related to amorphous silica content and the existence of contaminants, the purpose of this study was to investigate the influence of SCBA with different chemical and mineralogical compositions on the hydration-related properties of pastes and compressive strength and autogenous shrinkage of mortars. Thus, three different SCBA samples were studied, as well as a highly reactive rice husk ash (RHA) for comparison purpose. All materials were characterized by oxide composition, loss on ignition, proximate analysis, nitrogen adsorption, soluble fraction, X-ray diffraction, and pozzolanic activity. The hydration was then assessed on the pastes using isothermal calorimetry, chemical shrinkage, and X-ray diffraction. The results showed that SCBA samples with high silica-rich amorphous levels, fewer contaminants and high specific surface area behaved like RHA, with pronounced physical effects on hydration. SCBA-blended mortars irrespective of SCBA type caused rise in compressive strength, although only the most pozzolanic SCBA mortar was comparable to that with RHA. Moreover, all mixes with additions presented higher autogenous deformation than that of reference mortar. Increasing the ash pozzolanicity and refining the mortar pore structure increased considerably the mortar autogenous shrinkage.
Partial cement replacement by different sugar cane bagasse ashes: Hydration-related properties, compressive strength and autogenous shrinkage
Graphical abstract Display Omitted
Highlights Autogenous shrinkage of SCBA was assessed. Three completely different SCBA samples were compared. All mortars with pozzolan presented higher shrinkage than that of reference. Hydration of pastes was studied by isothermal calorimetry, chem. shrinkage and XRD. SCBA samples were compared with a pozzolanic RHA.
Abstract Assuming that the pozzolanicity of sugar cane bagasse ash (SCBA) is strongly related to amorphous silica content and the existence of contaminants, the purpose of this study was to investigate the influence of SCBA with different chemical and mineralogical compositions on the hydration-related properties of pastes and compressive strength and autogenous shrinkage of mortars. Thus, three different SCBA samples were studied, as well as a highly reactive rice husk ash (RHA) for comparison purpose. All materials were characterized by oxide composition, loss on ignition, proximate analysis, nitrogen adsorption, soluble fraction, X-ray diffraction, and pozzolanic activity. The hydration was then assessed on the pastes using isothermal calorimetry, chemical shrinkage, and X-ray diffraction. The results showed that SCBA samples with high silica-rich amorphous levels, fewer contaminants and high specific surface area behaved like RHA, with pronounced physical effects on hydration. SCBA-blended mortars irrespective of SCBA type caused rise in compressive strength, although only the most pozzolanic SCBA mortar was comparable to that with RHA. Moreover, all mixes with additions presented higher autogenous deformation than that of reference mortar. Increasing the ash pozzolanicity and refining the mortar pore structure increased considerably the mortar autogenous shrinkage.
Partial cement replacement by different sugar cane bagasse ashes: Hydration-related properties, compressive strength and autogenous shrinkage
Barbosa, Fabrício Lima (author) / Cordeiro, Guilherme Chagas (author)
2020-11-04
Article (Journal)
Electronic Resource
English
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