DOI: 10.5176/2301-394X_ACE16.73
Authors: Mohammed Tarek Uddin, Tanvir Ahmed
Abstract:
An experimental study was conducted to understand the influence of some factors on workability and compressive strength of ready mix concrete (RMC) in Bangladesh. To conduct this study, different types of plasticizers and superplasticizers were collected from local market. Sylhet sand and Bholaganj boulder crushed aggregate were used as fine and coarse aggregates respectively. Different concrete mixtures with different chemical admixtures and sand to total aggregate volume ratios were investigated. Slump test was carried out at 15 minutes interval till 90 minutes after mixing of concrete. Cylindrical concrete specimens of 150 mm diameter and 300 mm height were made to measure compressive strength at 7 days and 28 days. From the test results, it was found that plasticizers impart more compressive strength to concrete than most of the superplasticizers. However, superplasticizers give more workability than plasticizers. Concrete made with high range water reducing superplasticizer attains more strength than concrete made with retarding superplasticizer. But, retarding superplasticizers impart more workability to concrete. With the reduction of water to cement ratio (W/C) and increase of superplasticizer dosage (within a certain limit), the compressive strength of concrete is increased. Concrete mixtures with a lower sand to total aggregate volume ratio (s/a) gives more workability than those with a higher s/a.
Keywords: plasticizer; superplasticizer; sand to total aggregate ratio; workability; compressive strength
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