Elasticity and Durability of Concrete Made With Quarry Rock Dust and Washed 10mm Washed Gravel as Aggregates
[1]
Ephraim M. E., Department of Civil Engineering, Rivers State University of Science and Technology, Port-Harcourt, Nigeria.
[2]
Rowland-Lato E. O., Department of Civil Engineering, University of Port Harcourt, Port Harcourt, Nigeria.
This research is related to study the elasticity, tensile strength and durability of concrete using quarry dust as fine aggregate instead of sand and 10mm washed aggregate instead of conventional granite. Three mixes of 1:2:3, 1:1½:2 and 1:1:2 (by weight) and at water-cement ratios (w/c) of 0.65, 0.55 and 0.45 with characteristic strengths of 18.88N/mm2 28.23N/mm2 and 38.29N/mm2 respectively. The static modulus of elasticity of 1:2:3 mix falls far below the theoretical value of 24kN/mm2, while that of 1:1½:2 and 1:1:2 results is in close agreement with the theoretical values. It was observed that the durability of the concrete increases with increase in strength, and 1:2:3 and 1:1½:2 mixes possess a greater capacity to absorb water than 1:1:2 mix .Water absorption ranges between 2 -8%. The workability value compared favourably with conventional concrete. The aggregate/cement ratio of concrete is lower than conventional concrete. Therefore the 10mm washed aggregate and quarry dust satisfied the requirements of code provision in properties studies and can serve as full replacement for conventional granite and natural river sand respectively.
Concrete, Elasticity, Tensile Strength, Durability 10mm Gravel, Quarry Dust
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