Leeds Beckett University
Browse
SuitabilityOfCorncobAshAnthillSoilAndRiceHuskAsh-KAMAU.pdf (25.94 MB)

SUITABILITY OF CORNCOB ASH, ANTHILL SOIL AND RICE HUSK ASH AS SUPPLEMENTARY CEMENTITIOUS MATERIALS

Download (25.94 MB)
thesis
posted on 2022-11-14, 13:39 authored by John Kamau
Cement is the most utilised construction material and the second most consumed commodity in the world after water. It has been reported that the heavily energy-intensive processes that are involved in its production contribute about 7 to 10% (per cent) to the total global anthropogenic carbon dioxide (CO2), which is the main cause of global warming; and are expensive economically. It is however possible, that energy and cost efficiency can be achieved by reducing on the amount of cement, and in its place utilising Supplementary Cementitious Materials (SCMs), which require less process heating and emit fewer levels of CO2. This research aimed to provide an original contribution to the body of knowledge by investigating the suitability of Corncob Ash (CCA), Anthill Soil (AHS) and Rice Husk Ash (RHA) as SCMs by testing them for pozzolanic or hydraulic properties. Cement was replaced in concrete with these materials by weight, as well as by the volume of RHA at 0%, 5%, 7.5%, 10%, 15%, 20%, 25% and 30% steps at the point of need. Durability was investigated using the water absorption and sulfate tests. Results of the chemical analysis by X-Ray Diffraction (XRD) showed that CCA, AHS and RHA contained the required chemical composition for SCMs, and the mean compressive strengths (fcm) achieved, when converted to characteristic compressive strengths (fck,cube), were for those classes that are listed as being durable and suitable for structural applications. The behavior of these materials in workability, density, gain in compressive strength over time, water absorption and sulfate tests were also consistent with the characteristics of SCMs. The good repeatability observed across the range of tests that were carried out indicates a high level of confidence in the results obtained, and highlights the great potential of using CCA, AHS and RHA to enhance the durability of hardened concrete, mitigate on environmental nuisance, reduce the cost of construction and improve the overall properties of concrete.

History

Qualification name

  • PhD

Supervisor

Ahmed, Ash ; Hirst, Paul ; Kangwa, Joseph

Awarding Institution

Leeds Beckett University

Completion Date

2018-03-01

Qualification level

  • Doctoral

Language

  • eng

Publisher

Leeds Beckett University

Usage metrics

    LBU Theses and Dissertations

    Categories

    No categories selected

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC