Assessing Suitability of Margalla Crush for Ultra High Strength Concrete

A Ghaffar, Z. A. Siddiqi, K Ahmed


A trend of high-rise buildings is emerging in Lahore. Many tall buildings having number of stories 20 to 50 (like Mubarak Centre, Pace Tower, I T Tower and Aalamgir Center etc) are under construction. Though all these structures are designed for normal strength concrete, but use of high and ultra high strength concrete shall soon become a routine. The major source of aggregate in this area is from Margalla hills near Islamabad about 300 km from Lahore. An attempt was made in the laboratory to produce ultra high strength concrete using Margalla aggregates. This effort failed rendering Margalla crush as unsuitable for high and ultra high strength concrete. However, during testing, a strange phenomenon of strength development is noted which should attract the attention of researchers for further investigation.

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