Authors : Duha Abdalla Najm, Noorzahan Begum and Khairul Nizar Bin Ismail
Abstract: This study outlines the effect of external salt and internal sulphate (CaSO4) on the properties of Self-Compacting Concrete (SSC) containing lime stone. The effect of internal and external salts is combined with the process of wetting and drying. Three sets of mixes which are reference mix, mixes with internal sulphate and mixes exposed to external salts respectively are designed with the same mix proportion and maximum sized aggregate of 10 mm. In order to determine the self compactability features, different tests are adopted such as the slump flow, V-funnel and the L-box test. The mechanical properties studied in this study are the compressive strength and ultrasonic pulse velocity. Results show that the compressive strength of mixes with external salts is larger than mixes with internal sulphates for the ages of 28, 60, 90 and 180 days, respectively except for the age of 180 days achieved a higher compressive strength. Based on the obtained results, it is clear that it is possible to produce Self-Compacting Concrete (SCC) from local materials like limestone with good properties. The SCC is affected by salt attack and its effect by the process of wetting and drying but despite this fact, SCC still has good properties. The results indicated lime stone can improve salt resistance and can be used as portland cement replacement.
Duha Abdalla Najm, Noorzahan Begum and Khairul Nizar Bin Ismail, 2017. Effect of External and Internal Salt of Self-Compacting Concrete Containing Lime Stone. Journal of Engineering and Applied Sciences, 12: 4301-4305.