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Formulation of compressed stabilized earth brick using black uncontrolled burnt rice husk ash as full cement replacement

Riza, Fetra Venny (2017) Formulation of compressed stabilized earth brick using black uncontrolled burnt rice husk ash as full cement replacement. PhD thesis, Universiti Tun Hussein Onn Malaysia.


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Black uncontrolled burnt Rice Husk Ash (RHA) obtained from the boiler of rice mill is a waste product which usually causing air and water pollution. As a waste, RHA has very little value and commercial use. Hence this study examined the pozzolanic potential of RHA as a cement replacement in the Compressed Stabilized Earth Brick (CSEB) production. This is an experiment-based study that characterized the raw materials used to produce CSEB samples. In the characterization of raw materials, the XRD analysis found that the burning temperature of the RHA in the rice mill boiler was around 700-800°C. Pozzolanic assessments on the RHA found that it possesses pozzolanic characteristic within, and conformed to ASTM C 618 – 03. Besides that, this study has also managed to develop a new method of determining the pozzolanicity of RHA using electrical resistivity approach which is more practical than Luxan conductivity method. In term of pozzolanic conductivity, it was found that the RHA has a value of 0.47 mS/cm which indicates that the RHA has attained good pozzolanic conductivity. In CSEB samples production, two sets of soils were used which are laterite and clay, and two curing methods that are under tarpaulin sheet and in the curing chamber for 7, 14 and 28 days. CSEB samples used mix ratio of 1:8:2 in proportion binder: soil: sand with 15% water by weight by using 20, 40, 60 and 80% RHA ratio. The samples size of the bricks used is 100 x 50 x 30 mm which is based on Harrison’s brick factor ratio. All samples tested for compressive strength complied with BS 5628-1:2005 for common brick. For water absorption test, all CSEB samples satisfied the ASTM C-62 for normal weather, however only some percentage of the samples passed for moderate and severe weather. Hence this study has verified the hypothesis that waste uncontrolled burnt RHA from the rice mill possessed pozzolanic characteristic which can act as a binder when mix with lime in producing building brick and thus, producing affordable and sustainable building materials for housing project.

Item Type: Thesis (PhD)
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 24 Jun 2018 01:21
Last Modified: 24 Jun 2018 01:21
URI: http://eprints.uthm.edu.my/id/eprint/10195
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