Study on the behaviour of high strength palm oil fuel ash (POFA) concrete

Many researchers have studied the use of agro-waste ashes as constituents in concrete. These agro-waste ashes contained an amount of silica which could be used as a pozzolanic material. Palm Oil Fuel Ash (POFA) is a by-product produced in palm oil mills. This ash has pozzolanic properties that not o...

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Main Author:	Ahmed Eldagal, Omar Elmukhtar
Format:	Thesis
Language:	English
Published:	2008
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/9581/1/OmarElmukhtarMFKA2008.pdf
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id	my-utm-ep.9581
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spelling	my-utm-ep.95812018-06-29T21:51:01Z Study on the behaviour of high strength palm oil fuel ash (POFA) concrete 2008-11 Ahmed Eldagal, Omar Elmukhtar TA Engineering (General). Civil engineering (General) Many researchers have studied the use of agro-waste ashes as constituents in concrete. These agro-waste ashes contained an amount of silica which could be used as a pozzolanic material. Palm Oil Fuel Ash (POFA) is a by-product produced in palm oil mills. This ash has pozzolanic properties that not only enables the replacement of cement but also plays an important role in making strong and durable concrete. Collected POFA was dried and then sieved through a 300 Âµm sieve. Ashes passing through 300 Âµm sieve were ground in a modified Los Angeles abrasion test machine. The fineness of the POFA was checked by sieving through 45Âµm sieve at every half an hour grinding. For this research, total of five mixes were made of OPC as a control mix, OPC replaced with 20% and 30 % of POFA 10 Âµm and OPC replaced with 20 and 30 % of POFA 45 Âµm respectively. For compressive strength, six cubes of 100 mm tested at 7, 28, and 90 days. For flexural strength, three prisms of 100 x 100 x 500 mm were tested at 28 days. Five cylinders of 100 x 200 mm were tested for indirect tensile strength at 28 days for each mix. The slump test and compacting factor test were employed in measuring the fresh concrete. POFA concrete exhibit lower value of slump compared to slump of OPC concrete. Among POFA results, the finer the POFA, the lower the slump and hence lower degree of compaction. Although strength of POFA concrete did not exceed that of OPC, 58 MPa was achieved when using 20 % of POFA 10 Âµm. The flexural strength of POFA concrete is slightly lower than that of OPC. The higher was the replacement of OPC; the lower the flexural strength. Like that of flexural strength, indirect tensile strength of concrete containing POFA developed in a similar way. TG Analysis lead to the fact that the amount of Ca(OH)2 increased with curing age indicating the progress of cement hydration reaction. And reduction in weight loss attributed to dehydroxylation of calcium hydroxide, and subsequent increase in compression is indicative of pozzolanic reaction. From the microstructural analysis (FESEM), radiating clusters of C-S-H gel have lead to a densification of the structure, and an increase in strength. Hexagonal platelets of Ca(OH)2 could be observed in some samples. 2008-11 Thesis http://eprints.utm.my/id/eprint/9581/ http://eprints.utm.my/id/eprint/9581/1/OmarElmukhtarMFKA2008.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Ahmed Eldagal, Omar Elmukhtar Study on the behaviour of high strength palm oil fuel ash (POFA) concrete
description	Many researchers have studied the use of agro-waste ashes as constituents in concrete. These agro-waste ashes contained an amount of silica which could be used as a pozzolanic material. Palm Oil Fuel Ash (POFA) is a by-product produced in palm oil mills. This ash has pozzolanic properties that not only enables the replacement of cement but also plays an important role in making strong and durable concrete. Collected POFA was dried and then sieved through a 300 Âµm sieve. Ashes passing through 300 Âµm sieve were ground in a modified Los Angeles abrasion test machine. The fineness of the POFA was checked by sieving through 45Âµm sieve at every half an hour grinding. For this research, total of five mixes were made of OPC as a control mix, OPC replaced with 20% and 30 % of POFA 10 Âµm and OPC replaced with 20 and 30 % of POFA 45 Âµm respectively. For compressive strength, six cubes of 100 mm tested at 7, 28, and 90 days. For flexural strength, three prisms of 100 x 100 x 500 mm were tested at 28 days. Five cylinders of 100 x 200 mm were tested for indirect tensile strength at 28 days for each mix. The slump test and compacting factor test were employed in measuring the fresh concrete. POFA concrete exhibit lower value of slump compared to slump of OPC concrete. Among POFA results, the finer the POFA, the lower the slump and hence lower degree of compaction. Although strength of POFA concrete did not exceed that of OPC, 58 MPa was achieved when using 20 % of POFA 10 Âµm. The flexural strength of POFA concrete is slightly lower than that of OPC. The higher was the replacement of OPC; the lower the flexural strength. Like that of flexural strength, indirect tensile strength of concrete containing POFA developed in a similar way. TG Analysis lead to the fact that the amount of Ca(OH)2 increased with curing age indicating the progress of cement hydration reaction. And reduction in weight loss attributed to dehydroxylation of calcium hydroxide, and subsequent increase in compression is indicative of pozzolanic reaction. From the microstructural analysis (FESEM), radiating clusters of C-S-H gel have lead to a densification of the structure, and an increase in strength. Hexagonal platelets of Ca(OH)2 could be observed in some samples.
format	Thesis
qualification_level	Master's degree
author	Ahmed Eldagal, Omar Elmukhtar
author_facet	Ahmed Eldagal, Omar Elmukhtar
author_sort	Ahmed Eldagal, Omar Elmukhtar
title	Study on the behaviour of high strength palm oil fuel ash (POFA) concrete
title_short	Study on the behaviour of high strength palm oil fuel ash (POFA) concrete
title_full	Study on the behaviour of high strength palm oil fuel ash (POFA) concrete
title_fullStr	Study on the behaviour of high strength palm oil fuel ash (POFA) concrete
title_full_unstemmed	Study on the behaviour of high strength palm oil fuel ash (POFA) concrete
title_sort	study on the behaviour of high strength palm oil fuel ash (pofa) concrete
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2008
url	http://eprints.utm.my/id/eprint/9581/1/OmarElmukhtarMFKA2008.pdf
_version_	1747814760247721984

Study on the behaviour of high strength palm oil fuel ash (POFA) concrete

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