Investigation of the Effect of Aggregate/Cement and Water/Cement Ratios on Concrete Workability

Fresh concrete’s workability is determined by its consistency, mobility, and compactability. Several factors influence concrete workability, but the effect of aggregate/cement (AG/CM) and water/cement (W/C) ratios is the subject of this study. The study’s goals are to assess the aggregate/cement and water/cement ratios of freshly formed concretes, as well as the influence of different mix ratios on concrete workability (MC1, MC2, MC3, MC4, MC5, and MC6). To achieve this, slump, compacting factor, and modified vebe tests were carried out in an environment with a temperature of 26-30°C, 92 percent relative humidity, and little wind. Fresh concretes with AG/CM ratios of 6.1, 5.0, 4.0, 3.0, 2.5, 2.1 and W/C ratios of 0.6, 0.55, 0.5, 0.45, 0.4, and 0.38 were used in the testing. The data show that when the AG/CM and W/C ratios decline, slump and compacting factors rise, meaning that as workability increases, the AG/CM and W/C ratios decrease as well. The results also revealed that as the AG/CM and W/C ratios increase, the Vebe time decreases, implying that vibrating concretes with low AG/CM (3.0) and W/C (0.45) ratios is easier. As the W/C ratio rises, the AG/CM ratio climbs as well. The regression coefficients (R2) obtained from the Slump-AG/CM, Slump-W/C, Compacting factor-AG/CM, Compacting factor-W/C, Vebe time-AG/CM, and Vebe time-W/C curves are 96.7 percent, 98.8 percent, 99.4 percent, 99.3 percent, 99.1 percent, and 99.4 percent, indicating a clear relationship between them.

Author (S) Details

 

Joseph Chukwuka Okah

Department of Building Technology, Port Harcourt Polytechnic, Rivers State, Nigeria.

N. J. Elekima Amos

Department of Building Technology, Port Harcourt Polytechnic, Rivers State, Nigeria.

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