Volume 3, Issue 6, November 2014, Page: 410-419
Influence of Calcined Clay Pozzolana on Strength Characteristics of Portland Cement Concrete
Eric Opoku Amankwah, Develoment Office, University of Education, Winneba, Kumasi Campus, Ghana
Mark Bediako, CSIR –Building and Road Research Institute, Kumasi, Ghana
C. K. Kankam, Civil Engineering Department, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
Received: Dec. 12, 2014;       Accepted: Dec. 24, 2014;       Published: Jan. 6, 2015
DOI: 10.11648/j.ijmsa.20140306.30      View  3123      Downloads  274
The paper presents results of a study on concrete mixes containing two types of calcined clay pozzolanas obtained from Mankranso and Tanoso for structural application. Mankranso sample is labeled Type I whilst Tanoso also labeled as type II.Both clay samples were analysed to determine their physical and geotechnical properties whilst the chemical composition of the calcined clay samples analysed. Portland cement was replaced with 0%-25%Type I and 0-30% of Type II pozzolanas to formulate binder pastes and concretes. Setting times and normal consistency test were determined on the formulated binder paste. Three grades of concrete (25N/mm2, 30N/mm2 and 40N/mm2) containing pozzolana were prepared and their workability, density, compressive strength and flexural strength investigated against the plain concrete. Concretes with clay pozzolana had delayed setting times and lower densities. They also exhibited a reduction in compressive and tensile strength development at early age (7 days), with an average drop of 6 percent in compressive strength for all grades. However, the compressive and tensile strengths beyond 28 days notably exceeded the control un-blended mixes. This study recommends up to 20% clay pozzolana content of both Types I and II for concrete grades of 25N/mm2, 30N/mm2 and 40N/mm2.
Concrete, Calcined Clay, Normal Consistency, Concrete Grade, Compressive Strength, Flexural Strength, Setting Times, Workability
To cite this article
Eric Opoku Amankwah, Mark Bediako, C. K. Kankam, Influence of Calcined Clay Pozzolana on Strength Characteristics of Portland Cement Concrete, International Journal of Materials Science and Applications. Vol. 3, No. 6, 2014, pp. 410-419. doi: 10.11648/j.ijmsa.20140306.30
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