Department of Building Technology

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Browsing Department of Building Technology by Author "Ajayi, Emmanuel Onaivi"

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    Effects of pulverized burnt clay waste fineness on the compressive strength and durability properties of concrete
    (Engineering Journal, 2018-03-30) Ajayi, Emmanuel Onaivi
    In this study, the fineness of pulverized burnt clay waste (PBCW) was evaluated as a factor that affects the compressive strength, resistance to chloride penetration and acid attack on concrete. PBCW obtained from a source was divided into two different fineness portions using 75 and 150 µm sieves and classified as a fine and coarse portion, respectively. Portland cement was replaced at 0 (control), 10 and 20% by weight with fine and coarse portions separately. Additional mix containing 105% binder content consisting of 5% excess fine and coarse portions were included in the 10 and 20% cement replacement. Chloride penetration was measured using full immersion technique in 3% sodium chloride solution while percentage mass loss and strength deterioration were assessed using a 5% sulphuric acid solution. Incorporating PBCW in concrete increases the demand for superplasticiser at a constant water-cement ratio but more prominent with the fine PBCW. The use of fine PBCW resulted in a significant improvement in compressive strength, chloride ion penetration and strength deterioration of the concrete. The fine PBCW is suggested to be more reactive due to the increased specific surface area resulting from its particles been obtained from a smaller sieve size than the coarse PBCW. Concretes containing PBCW performed better in mass loss reduction than control specimens in the aggressive medium. The PBCW cement concrete properties were further improved with the use of 105% total binder content containing 5% excess pozzolan, especially at 10% cement replacement.