A Study of Pozzolanic Reaction of Two Bottom Ashes Obtained from Lignite and Bituminous Coal Combustion

Akkadath Abdulmatin; Pokpong Rattanachu; Penpichcha Khongpermgoson; Weerachart Tangchirapat; Chai Jaturapitakkul

Authors

Akkadath Abdulmatin Department of Civil Engineering, Faculty of Engineering, Princess of Naradhiwas University, Narathiwat, Thailand
Pokpong Rattanachu Department of Civil Engineering, Faculty of Engineering, Princess of Naradhiwas University, Narathiwat, Thailand
Penpichcha Khongpermgoson Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Weerachart Tangchirapat Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand
Chai Jaturapitakkul Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand

Keywords:

Compressive Strength, Bottom Ash, Pozzolanic Reaction, Pozzolanic Material

Abstract

This study aimed to evaluate the compressive strength due to pozzolanic reaction of two types of ground bottom ash. Ground lignite (GLBA) and bituminous (GBBA) bottom ashes were used as pozzolanic materials to replace ordinary Portland cement (OPC) in mortar at either 10, 20, 30 or 40% by weight of binder. The results showed that at the later age, the use of GLBA and GBBA, which possessed the particles retained on No. 325 sieve of 3.70 and 3.05%, respectively, at 10% and 20% by weight of binder, respectively, resulted in the highest compressive strength of mortar. Compressive strength due to pozzolanic reaction of GLBA mortars with the replacement ratios of 10-40% by weight of binder ranged between 9-11% at 28 days and increased to 13-17% at 90 days of the control mortar. On the other hand, GBBA mortars exhibited compressive strength due to pozzolanic reaction between 15-25% and 17-38% at 28 days and 90 days, respectively. These results indicated that the compressive strength due to pozzolanic reaction of GLBA mortars was lower than that of GBBA mortars at the same replacement rate. However, GBLA could still be used to replace OPC by up to 30% by weight of binder; the resulting mortar exhibited the compressive strength higher than 80% of that of the control mortar at 28 days.

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