INFLUENCE OF ORIENTATION AND SIZE OF VOIDS ON CONCRETE CUBE STRENGTH
DOI:
https://doi.org/10.4314/njt.191.440Abstract
Many concrete units like hollow concrete blocks; columns and beams are used as construction components without adequate knowledge of the effect of void orientation. Void orientation causes variation in the thickness of the concrete components. Consequently, influence of square voids inclined at 00,150, 25°, 35°, 45° to the horizontal axis of as-cast face of hollow concrete cubes were investigated.
Analysis of the four grades of concrete studied showed that both void orientation and size of voids have influence on the uniaxial compressive strength of hollow concrete cubes. It showed that 45° void orientation has the highest strength. Void size effect depicts a minimum value corresponding to the least effective bearing area. It is recommended that for void volumes up to 30%, 45° void orientation should be used because of its high strength value.
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