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Clay Mixtures and the Mechanical Properties of Microporous and Nanoporous Ceramic Water Filters

Author(s): Annan, E; Kan-Dapaah, K; Azeko, ST; Mustapha, K; Asare, J; et al

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Abstract: This paper presents the results of an experimental study of the effects of clay mixtures on the mechanical properties of mixed clays with controlled levels of plasticity, prior to the firing of porous ceramic water filters for water filtration. Two clays with well-characterized initial compositions (Iro and Ewuya clays) are mixed with varying proportions to control their plasticity. The mechanical properties of the mixed and fired clays are then studied using a combination of experiments and theoretical models. These include the flexural strength, fracture toughness, Young’s modulus, and thermal shock resistance of fired clay mixtures. The results show that clay mixtures with 45–60 vol.% of Iro clay and 40–55 vol.% Ewuya clay can be used to produce clay composite filters with robust mechanical properties. The thermal shock resistance of a mixed clay filter (containing 50% Iro clay and 50% Ewuya clay) is also explained using a combination of elastic and viscoelastic crack-bridging models. The regimes for effective viscoelastic crack bridging are identified by comparing the relaxation times to the thermal shock durations. The implications of the results are then discussed for the mixing of locally available clays into robust micro- and nanoporous materials for applications in clay ceramic water filters.
Publication Date: Oct-2016
Electronic Publication Date: 10-May-2016
Citation: Annan, Ebenezer, Kwabena Kan-Dapaah, Salifu T. Azeko, Kabiru Mustapha, Joseph Asare, M. G. Zebaze Kana, and Wole Soboyejo. "Clay mixtures and the mechanical properties of microporous and nanoporous ceramic water filters." Journal of Materials in Civil Engineering 28, no. 10 (2016): 04016105. doi: 10.1061/(ASCE)MT.1943-5533.0001596
DOI: doi:10.1061/(ASCE)MT.1943-5533.0001596
ISSN: 0899-1561
EISSN: 1943-5533
Pages: 04016105
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Materials in Civil Engineering
Version: Author's manuscript

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