STRENGTH DEVELOPMENT OF ORDINARY PORTLAND CEMENT BRANDS USED IN NIGERIA
Publication Date : 01/08/2006
This paper presents the findings of an investigation into the strength development of some brands of ordinary Portland cement (OPC) used in Nigeria. The OPC brands considered are Dangote cement, Eagle cement, Burham cement, Ashaka cement, and Sokoto cement. These were represented not in any particular order, as A, B, C, D and E respectively. The strength of cement was determined by compressive strength tests of grade 20 concrete produced with the brands. The results from the study show that all the brands of OPC tested displayed varying degree of responses to the provision of the BS 4550(1978) and NIS (1974) Standards; as they satisfy the minimum compressive strength requirements at 3, 7, 14, 21, and 28 days periods within normal laboratory condition of curing, drying & testing. The results showed average compressive strength of brand „A‟ as 30.37, 35.26, 37.41, and 39.28, 39.53N/mm2 for 3, 7, 14, 21 and 28 days respectively. Whereas brand „B‟ results are 24.74, 31.40, 34.4, 36.4, 37.47N/mm2: for 3, 7, 14, 21 and 28 days respectively. Similarly brand „C‟ results are 22.67, 27.55, 30.3, 32.5, 33.03 N/mm2 and „D‟ attained strength of 25.63, 29.92, 31.41, 33.05, 35.11 N/mm2 for 3, 7, 14, 21 and 28 days respectively. While Brand „E‟ results are 22.37 27.11, 31.11, 32.03, 32.89N/mm2 for 3,7,14,21, and 28 days periods respectively. These results displayed varying degree of strength development characteristics of the OPC brands used in construction work in the country. It also showed that brands of OPC manufactured in Nigeria performed creditably well when compared to the imported ones.
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