Effects of Curing on the Compressive Strengths of Commercial Sandcrete Blocks in Calabar Nigeria

Full Text PDF PDF
Author(s) Desmond E. Ewa | Joseph O. Ukpata | Anderson A. Etika
Pages 716-729
Volume 3
Issue 7
Date July, 2013
Keywords Sandcrete Blocks, Compressive Strength, Curing.

Abstract

This study considered the effects of curing on the compressive strength property of 150mm thick sandcrete blocks produced by commercial block industries in Calabar South-Eastern Nigeria. Commercial sandcrete blocks were randomly selected from ten (10) block moulding sites and cured in the Concrete and Materials Laboratory of the Cross River University of Technology, Calabar for 7, 14, 21 and 28 by watering every morning and evening up to the testing dates. The 28 day compressive test results were compared with those cured in the sites. The results indicated that the 28-day compressive strengths of blocks cured at site by the producers range from 0.23N/mm2 to 0.58N/mm2, while those cured in the University Laboratory range from 1.08 N/mm2 to 1.15 N/mm2. Although the compressive strengths of all the blocks were below the minimum requirements of 1.75N/mm2 by the Nigerian National Building Code (2006) for individual block, and 2.8N/mm2 by the British Standard BS 6073, improved curing resulted in increased strength of the commercial blocks by 98.28%.The study concludes that poor curing practices and low cement content are responsible for the poor quality of commercial sandcrete blocks produced in Calabar.

< Back to July Issue