Effects of LOI of ground bagasse ash on the compressive strength and sulfate resistance of mortars

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Publication Details

Author list: Chusilp N., Jaturapitakkul C., Kiattikomol K.

Publisher: Elsevier

Publication year: 2009

Journal: Construction and Building Materials (0950-0618)

Volume number: 23

Issue number: 12

Start page: 3523

End page: 3531

Number of pages: 9

ISSN: 0950-0618

eISSN: 1879-0526

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-70349298356&doi=10.1016%2fj.conbuildmat.2009.06.046&partnerID=40&md5=3217cc3070f92190891a975e17e0dc37

Languages: English-Great Britain (EN-GB)

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Abstract

Raw bagasse ash collected from the Thai sugar industry has a high loss on ignition (LOI) of ∼20%. When ground and ignited at 550 °C for 45 min, the LOI was reduced to ∼5%. These high and low LOI of ground bagasse ashes were blended in the ratios of 1:2 and 2:1 by weight to give ground bagasse ashes with LOIs of 10% and 15%, respectively. Each of these ground bagasse ashes was used to replace Portland cement type I at 10%, 20%, 30%, and 40% by weight of binder to cast mortar. The results showed that the development of compressive strengths of mortars containing ground bagasse ash with high LOI was slower than that of mortar containing ground bagasse ash with low LOI. However, at the later age, both types of ground ash mortars displayed similar compressive strengths. Mortars containing high LOI (∼20%) of ground bagasse ash at 20% and 30% by weight of binder could produce higher compressive strengths than a control mortar after 28 and 90 days, respectively. Mortar bars containing ground bagasse ash at 10% showed a greater potential sulfate resistance and displayed a reduce expansion compared to a control mortar. However, mortar bars containing high LOI (larger than 10%) of ground bagasse ashes showed greater deterioration from sulfate attack than the mortar bars containing low LOI (less than 10%) of ground bagasse ashes, especially at high replacement levels (30-40%). © 2009 Elsevier Ltd. All rights reserved.

Keywords

LOI, Mortar