Volume :

2

Issue :

3

Abstract :

Two very basic possessions of concrete are being addressed by this research work i.e. Durability and Compressive Strength of concrete. The major variable that is introduced in the research work is Bentonite plus Silica Fume (CBS) together, as partial replacements by weight of cement. The experimental program explained by this explosion contains two parts. The first part was to investigate the potential use of Bentonite plus Silica Fume (CBS) to evaluate its effect on Compressive strength of High Performance Concrete (HPC). An HPC batch, properly mix designed was prepared, aiming at strength of 6000psi. Super plasticizer was also introduced to attain high workability. Some part of the batch was treated for a Compressive Strength test. The second part of research work addresses its effect on Durability of concrete. For this purpose the rest of the batch was exposed to a cycle of wetting and drying in sulfate rich atmosphere, the solution containing 50 g/l of Na2SO4. The durability was measured in terms of resistance offered to the penetration of sulfate ions into the concrete. Ultrasonic Pulse Velocity testing was performed for this purpose and the quality of concrete was checked. It was seen from the results that BS samples resulted in fairly good early and later stage Compressive strength when compared with Control samples. On the other hand it showed very good resistance to sulfate attack. Control samples which were exposed to sulfate environment were affected very harshly.