Abstract

Low-cost housing is urgently needed in low- and middle-income countries. Con-crete is often too costly and raw material production, including aggregate extrac-tion, is known to be harmful to the environment. In this paper the use of an agri-cultural waste, corncob, as a potential lightweight replacement of sand in cement materials has been studied. Corncob granules were added to the mix in percent-ages of 5%, 10%, 15% and 20% by volume. The corncob granules were used in their natural state as well as following coating with either cement slurry or gum Arabic. The effect of sand replacement was determined through flexural and compressive testing of materials, while the chemical composition was evaluated using Thermogravimetric Analysis (TGA) and X-Ray Diffraction (XRD). The porosity of the mixes was also determined using a mercury inclusion porosimeter (MIP). The results showed that while the early age strength (7 days) was ex-tremely low, the late age’s strengths improved drastically between 10% up to 3500% in 28 days.
Original languageEnglish
Publication statusPublished - 2021
Event75th RILEM Annual Week & International Conference on Advances in Sustainable Construction Materials and Structures - Merida, Mexico
Duration: 30 Aug 20213 Sep 2021
http://rilemweek2021.uanl.mx/

Conference

Conference75th RILEM Annual Week & International Conference on Advances in Sustainable Construction Materials and Structures
CountryMexico
Period30/08/213/09/21
Internet address

Keywords

  • Corncob
  • Maize
  • Cement
  • Low-cost housing
  • strength

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