Effect of Curing Conditions on Microstructure and Pore-Structure of Brown Coal Fly Ash Geopolymers

Chamila Gunasekara; Rahmat Dirgantara; David W. Law; Sujeeva Setunge

doi:10.3390/app9153138

journal article Open Access Aug 02, 2019

Effect of Curing Conditions on Microstructure and Pore-Structure of Brown Coal Fly Ash Geopolymers

Chamila Gunasekara

Rahmat Dirgantara David W. Law

Sujeeva Setunge

Applied Sciences Vol. 9 No. 15 pp. 3138 · MDPI AG

View at Publisher Save 10.3390/app9153138

Abstract

This study reports the effect of heat curing at 120 °C on the geopolymeric reaction and strength evolution in brown coal fly ash based geopolymer mortar and concrete. Moreover, an examination of this temperature profile of large size geopolymer concrete specimens is also reported. The specimen temperature and size were observed to influence the conversion from the glassy (amorphous) phases to the crystalline phases and the microstructure development of the geopolymer. The temperature profile could be divided into three principal stages which correlated well with the proposed reaction mechanism for class F fly ash geopolymers. The geopolymerisation progressed more rapidly for the mortar specimens than the concrete specimens with 12 to 14 h providing an optimum curing time for the 50 mm mortar cubes and 24 h being the optimum time for the 100 mm concrete cubes. The 50 mm and 100 mm concrete specimens’ compressive strengths in excess of 30 MPa could be obtained at 7 days. The structural integrity was not achieved at the center of 200 mm and 300 mm concrete specimens following 24 h curing at 120 °C. Hence, the optimal curing time required to achieve the best compressive strength for brown coal geopolymer was identified as being dependent on the specimen size.

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Details

Published: Aug 02, 2019
Vol/Issue: 9(15)
Pages: 3138
License: View

Authors

C

Chamila Gunasekara

Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia

R

Rahmat Dirgantara

Civil Engineering Department, Faculty of Computer and Engineering, Universitas Harapan, Medan 20216, Indonesia

D

David W. Law

Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia

S

Sujeeva Setunge

Civil and Infrastructure Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia

Cite This Article

Chamila Gunasekara, Rahmat Dirgantara, David W. Law, et al. (2019). Effect of Curing Conditions on Microstructure and Pore-Structure of Brown Coal Fly Ash Geopolymers. Applied Sciences, 9(15), 3138. https://doi.org/10.3390/app9153138

Effect of Curing Conditions on Microstructure and Pore-Structure of Brown Coal Fly Ash Geopolymers

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