Studies on the Effect of Additives on the Strength of Ordinary Portland Cement
The effects of additives, such as slag, limestone and fly ash on the strength of ordinary Portland cement (OPC) have been studied. The percentages of the additives were varied from 9 to 29%. 2.5% gypsum was used in all preparations. The influence of the additives on the strength of OPC was monitored by measuring compressive strengths. The results indicated that the strengths of all the composite cements were nicely satisfied the respective American Society for Testing and Materials (ASTM) values recommended for different times of curing. It was observed that the strengths of the all composite cements gradually increased with time of curing. Interestingly, slag composite cements showed higher strengths at all ages (3, 7 and 28 days). On the other hand, limestone composite cements showed comparatively lower strengths but higher than that of ASTM recommended values. It has also been observed that the strengths are independent of the fineness of the composite cements.
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