WORKABILITY RETENTION POTENTIALS OF CLASS C AND F POZZOLANS AND THEIR INFLUENCE ON CEMENT PROPERTIES
Publication Date : 06/08/2019
ABSTRACT This study examines the potentials of some Class C and F Pozzolans in workability retention of concrete and their effect on cement properties. Percentage replacement of 0%, 5%, 10%, 15% and 20% were adopted in the study. Class F Pozzolans considered are; Cassava Peel Ash (CPA), Rice Husk Ash (RHA) and Saw Dust Ash (SDA) while Class C Pozzolans considered are Periwinkle Shell Ash (PSA), Palm Kernel Shell Ash (PKSA), and Locust Bean Pod Ash (LBPA). A total of Fourteen (14) concrete mixes were prepared, 2 mixes for each Pozzolan, including control sample. Changes in properties of the binder are investigated by conducting consistency, setting time, and soundness test on cement samples. Results of physical properties of binder obtained conformed to BS EN 197-1, 2001. Slump losses up to 45mm in 40 minutes for RHA and PSA at 5% replacement, while for higher percentage replacement more slump lost were recorded. Up to 50 mm slump loss in 40 minutes was recorded for 5% and 10% replacement. Soundness for all Pozzolans at all replacement was found to be within the acceptable limit of 10 mm. These findings revealed the potential of Pozzolanic material in slump controlled concreting, which can be utilised in Slip form paving concrete with little or no admixture.
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