Utilisation of rice husk ash and fly ash as a partial replacement for cement in self-consolidating concrete

Smith, Cameron (2016) Utilisation of rice husk ash and fly ash as a partial replacement for cement in self-consolidating concrete. [USQ Project]

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The production of rice on a global scale results in significant quantities of agricultural waste. A leading constituent of this waste is rice husk. On combustion, it has been identified that the cellulose-lignin matrix of rice husk burns away leaving only a silica skeleton, along with small quantities of trace elements. In response to the continual evolution towards an environmentally aware society, there is increasing demand for the application of sustainable building materials and minimising of waste to landfill. Therefore it has been identified that the practical application of Rice Husk Ash (RHA) as a Supplementary Cementitious Material (SCM) is capable of reducing both the quantity of Portland cement used in the construction industry, and also the quantity of rice husk contributing to landfill. Previous research has identified that RHA is a suitable pozzolanic material, indicating that it is able to react with cement in the hydration reaction. Therefore it is possible to utilise RHA in a similar application to that of Fly Ash, a common pozzolanic material, to create a cost effective sustainable building material.

Application of Self-Consolidating Concrete (SCC) in the construction industry provides a potential solution to the limitations facing the use of traditional concrete in densely reinforced structural members. As SCC can flow and consolidate under its own weight, it is able to pass through extensive layers of reinforcement and settle more effectively without the need for vibration.

The aim of this research is to determine the optimum quantity of Rice Husk Ash (RHA) and Fly Ash that can be incorporated as a supplementary cementitious material for partial replacement of Portland cement in a self-consolidating concrete. This will be conducted through testing of the Compressive and Flexural strength of 6 test samples that differ in amounts of RHA and Fly Ash ranging from 20% to 50% total replacement percentage.

The outcomes identified suggest that RHA burnt under the proposed experimental conditions has the potential to be applied as a pozzolanic material. Likely applications include any works requiring a low strength concrete with high flowability. Factors limiting the use of SCC in construction were also identified, with one key issue being the presence of air voids indicating potential for premature failure. Further development of this material has the potential to mitigate this issue.

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Item Type: USQ Project
Item Status: Live Archive
Additional Information: Bachelor of Engineering (Honours) Major Civil Engineering project
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Supervisors: Zhuge, Yan
Date Deposited: 23 Jul 2017 23:33
Last Modified: 23 Jul 2017 23:33
Uncontrolled Keywords: rice husk ash; partial replacement for cement; fly ash; self-consolidating concrete; sustainable building material
Fields of Research (2008): 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Fields of Research (2020): 40 ENGINEERING > 4005 Civil engineering > 400505 Construction materials
URI: https://sear.unisq.edu.au/id/eprint/31483

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