Experimental Evaluation of Local Agro Waste Using Modified Chapelle Test Method

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@article{1722667,
      author = {Usman Abdu Abubakar, Aaron Stephen Gadong},
      title = {Experimental Evaluation of Local Agro Waste Using Modified Chapelle Test Method},
      journal = {Iconic Research And Engineering Journals},
      year = {2026},
      volume = {10},
      number = {2},
      pages = {3557-3565},
      issn = {2456-8880},
      url = {https://www.irejournals.com/formatedpaper/1722667.pdf},
      abstract = {This experimental study make use of the modified Chapelle test as a direct method for the determination of lime consumption in pozzolanic materials, in this case fonio husk ash is the pozzolanic material. The chemical test, performed during 16 hours at 90 °C, allows the quantification of Ca(OH)2 fixed by the fonio husk ash samples. The calcium hydroxide that was not consumed is quantified by hydrochloric acid titration, and the test result is expressed in mg of fixed calcium hydroxide by g of the fonio husk ash. According to the modified Chapelle test in respect to NFP 18 – 513 standard, for a material to be classified as highly pozzolanic, it must fix more than 700 mg of Ca(OH)₂ per gram of the material. The modified Chapelle pozzolanic activity of the seven fonio husk ash samples was experimentally evaluated between 720 and 1060 mg Ca(OH)2/g fonio husk ash. From the seven fonio husk ash samples produced between 650 ºC and 850 ºC, the FHA-850 sample has the highest modified Chapelle pozzolanic activity value of 1060 mg Ca(OH)2/g fonio husk ash, this is in agreement with some tested commercial metakaolin produced at industrial scale according to some established literatures. The fonio husk ash produced at 850 ºC resulting in a particle size reduction of ≈ 1.2% less and a consequent increase of 21 % in the pozzolanic reactivity. Therefore, Pozzolanic reactivity of the fonio husk ash produced at 650oC meet the standard minimum requirement to be used as a pozzolan.},
      keywords = {Fonio Husk, Fonio Husk Ash, Direct Method, Modified Chapelle test and Pozzolanic Reactivity.},
      month = {August},
      doi = {https://doi.org/10.64388/IREV10I2-1722667}
  }