Suitability of Corncob Ash as a supplementary Cementitious Material

Journal article


Kamau, J, Ahmed, A, Hirst, P and Kangwa, J (2016). Suitability of Corncob Ash as a supplementary Cementitious Material. International Journal of Materials Science and Engineering. 4 (4), pp. 215-228.
AuthorsKamau, J, Ahmed, A, Hirst, P and Kangwa, J
Abstract

Cement is the most utilized construction material, and the second most consumed commodity in the world after water. Its demand has soared proportionately with the exponential rise in population in a bid to match the required development. The heavily energy-intensive processes that are involved in its production contribute to about 7 to 10 per cent (%) of the total global emissions, with potentially adverse environmental implications, and are also economically expensive. These processes, and generally those of the production of concrete consume heavily on natural resources such as sand, gravel, water, coal and crushed rock, mining of which mars the environment. It is however possible, that energy and cost efficiency can be achieved by reducing on the amount of clinker, and in its place utilising supplementary cementitious materials (SCMs) that require less process heating and emit fewer levels of carbon dioxide (CO2). This study investigated the ability of corncob ash (CCA) to be used as a SCM by testing for pozzolanic or hydraulic properties and performance in sulfate environments. Experiments were carried our by supplementing cement by weight in concrete mixes with CCA at 5%, 7.5%, 10%, 15%, 20%, 25% and 30% steps at the point of need. Results were compared with a control specimen, which was made with 100% cement. Durability was tested using the sulfate elongation test. The results showed impressive compressive strengths that were suitable for structural applications. It was concluded from the sulfate elongation test that CCA supplemented concrete could be used in aggressive environments with an advantage. The results showed good repeatability and highlight the potential of CCA as an effective pozzolan, which could enhance the sustainability and economic aspect of concrete, as well as improve its properties in both the wet and hardened states.

KeywordsCementitious materials; corncob ash; partial cement replacements; pozzolans
Year2016
JournalInternational Journal of Materials Science and Engineering
Journal citation4 (4), pp. 215-228
PublisherLondon South Bank University
Digital Object Identifier (DOI)doi:10.17706/ijmse.2016.4.4.215-228
Publication dates
Print04 Dec 2016
Publication process dates
Deposited22 Aug 2017
Accepted08 Nov 2016
File
License
CC BY 4.0
Permalink -

https://openresearch.lsbu.ac.uk/item/8712x

  • 18
    total views
  • 21
    total downloads
  • 6
    views this month
  • 8
    downloads this month

Related outputs

Exploring the perceptions of construction SMEs on appropriate supporting policies for growth and development by the Qatari government for effective participation in infrastructure procurement and delivery for the 2022 World Cup
Kangwa, J and Ebohon, O J (2019). Exploring the perceptions of construction SMEs on appropriate supporting policies for growth and development by the Qatari government for effective participation in infrastructure procurement and delivery for the 2022 World Cup. ASOCSA 12th Built Environment Conference. Durban, South Africa 05 - 07 Aug 2018 Association of Schools of Construction of Southern Africa.
Where are the Barriers to Sustainable Construction in Africa? Key Note Speech
Kangwa, J (2019). Where are the Barriers to Sustainable Construction in Africa? Key Note Speech. ASOCSA 12th Built Environment Conference. Durban, South Africa 05 - 07 Aug 2018
Suitability of Anthill Soil as a Supplementary Cementitious Material
Kangwa, J, Kamau, J, Ahmed, A and Hirst, P (2018). Suitability of Anthill Soil as a Supplementary Cementitious Material. European Journal of Engineering Research and Science -EJERS. 3 (7), pp. 5-11.
Permeability of Corncob Ash, Anthill soils and Rice husk replaced concrete
Kamau, J, Ahmed, A, Hirst, P and Kangwa, J (2017). Permeability of Corncob Ash, Anthill soils and Rice husk replaced concrete. International Journal of Science, Environment and Technology. 6 (2), pp. 1299-1308.
Viability of using Corncob Ash as a Pozzolan in Concrete
Kamau, J, Ahmed, A, Hirst, P and Kangwa, J (2016). Viability of using Corncob Ash as a Pozzolan in Concrete. International Journal of Science, Environment and Technology. 5 (6), pp. 4532-4544.
Performance of Class F Pulverised Fuel Ash and Ground Granulated Blast Furnace Slag in Ternary Concrete Mixes
Kamau, J, Ahmed, A, Hirst, P and Kangwa, J (2017). Performance of Class F Pulverised Fuel Ash and Ground Granulated Blast Furnace Slag in Ternary Concrete Mixes. EJERS, European Journal of Engineering Research and Science. 2 (6), pp. 36-41.
Influence of Rice Husk Ash Density on the workability and strength of structural concrete
Kangwa, J, Kamau, J, Ahmed, A, Hirst, P and Hyndman, F (2017). Influence of Rice Husk Ash Density on the workability and strength of structural concrete. European Journal of Engineering Research and Science. 2 (3), pp. 36-43.
Performance of Anthill Soil Replaced Concrete in Sulfate Solutions
Kamau, J, Ahmed, A and Hirst, P (2017). Performance of Anthill Soil Replaced Concrete in Sulfate Solutions. European Journal of Engineering Materials and Science. 2 (5), pp. 50-55.