Concrete is well known for its compressive strength. Shear resistance of plain concrete depends on concrete mix proportion, compaction level , size of the specimen, rate of loading, curing condition etc. One way of testing shear resistance of plain concrete is applying shear force on beam specimen of short span. The contribution of coarse aggregate towards shear resistance depends upon mechanical properties of aggregates, bond strength, surface texture of the aggregates , size and shape of the aggregates. Experimental work using given proportion of ingredients of concrete but changing the size and shape of the coarse aggregates for finding the effect of size and shape of coarse aggregates on shear performance of plain concrete is possible but it is costly and time consuming. Moreover, the concrete mix quality will also change due to change in size and shapes of coarse aggregates.
In general, determination of contribution of coarse aggregates towards shear resistance of concrete is complex . But, it is essential because shear failure of concrete is brittle type and particularly for unreinforced concrete it is most important also.
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