Abstract
This research is focused on the impact of three types of polycarboxylate polymer (PCE) on the plastic properties such as setting time of cement and slump of concrete and also, to assess their effects on compressive strength (CS) and concrete density. The percentage of each type of polymer ranged from 0 to 0.25% (by weight of cement). The slump test and CS results of concrete modified with polymers were compared with the silica fume concrete used in the literature. The water to cement ratio (w/c) initially was 0.60 and decreased gradually to 0.46 by increasing the polymer dosage. The CS of concrete modified with 0.25% of polymers increased by 24% and 97% based on the polymer type, polymer content, w/c and curing age. Non-linear regression analysis was used to model the compressive strength of concrete modified with three types of the polymer as a function of polymer content, w/c, and curing time. Based on the literature data and results of this study, it found that the polymers are more effective than silica fume on enhancing the workability and CS of concrete.
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