INVESTIGATING THE PROPERTIES OF CONCRETE INCORPORATING CALCINED EARTHWORM CAST AS PARTIAL REPLACEMENT FOR CEMENT.
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ABSTRACT
Concrete is a major material in the construction industry in Nigeria and the world at large, either mass concrete alone or sometimes complimented with other materials like steel. Calcined earthworm cast is cast that has been subjected to great heat. The primary aim of this research was to determine the strength characteristics of concrete incorporating calcined earthworm cast as partial replacement of cement. The objectives were to to obtain the optimum percentage of calcined earthworm cast that can be used to replace cement in a given concrete mix, and to examine the physical and chemical properties of the admixture (calcined earthworm cast).
From the tests carried out on the characteristic of concrete using earthworm cast as a pozzolana, it was concluded that; the initial and final setting time of the concrete containing earthworm cast increases with the increase in earthworm cast content. The specific gravity of calcined earthworm cast is 2.38. The bulk density of calcined earthworm cast is 1294 kg/m3.
In all mixes, compressive strength decreased with increase in calcined earthworm cast replacement.
The compressive strength of concrete obtained ranged from 25.16 to 15.66 N/mm2 with 0, 10, 20, 30% replacement earthworm cast replacement of cement achieved above 70% of the required strength of the concrete while the 40 % replacement failed to reach 70% of the expected strength.
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TH Building construction