Compressive Strength of Re-Vibrated Concrete Containing Locust Bean Epicarp Extract and Bida Natural Stone As Coarse Aggregate

Abstract

Abstract: The compressive strength of re-vibrated concrete containing locust bean epicarp extract and Bida Natural Stone (BNS) as coarse aggregate. one hundred and sixty-eight concrete cubes were produced in six batches, in which twenty- eight cubes was produce in each of this batches. However, two of these batches were at 0% LBEE + 100% OPC and 100% LBEE + 100%OPC, the rest are at cement reduction content of 5, 10, 15 and 20%, but all the others concrete mix ingredients remained constant. The epicarp used was at constant concentration of 0.1kg/l. The concrete mix adopted was 1 :2 :4 using ordinary Portland cement with water cement ratio of 0.5. The preliminary results show that the aggregate falls within the BS requirement. Concrete cubes were cast with re-vibration time lag intervals of 10minute for the period of 60minute re-vibration process and cured for 7 and 28days. When tested for their respective compressive strength, the result obtained shows that there is increase in compressive strength with increase in re- vibration time lag. The result also shows that introduction of LBEE increase compressive strength of concrete produced despite cement reduction up to 20%. The maximum compressive strength for all batches at 28days cu ring was obtained at 60 minutes. For batch B at 40-minute re-vibration time interval for and water cement ratio of 0.5 at constant concentration LBEE of 0.1kg/l. The maximum attained compressive strength for 28days curing was 36.27N/mm2 for B (100% LBEE + 100% OPC) appears to be higher than 35.42N/mm2 for A (0% LBEE+ 100% OPC). This indicates that the uses of LBEE has adversely enhanced the compressive strength of concrete when re-vibrated.