Effect of Silica Fume and Bentonite on Strength and Durability of High Performance Concrete

Author(s):

Sheraz , DEPARTMENT OF CIVIL ENGINEERING IQRA NATIONAL UNIVERSITY PESHAWAR

Keywords:

Sulphat Attack, Bentonite

Abstract:

The project work addresses the strength and durability of concrete against Sulfate Attack on concrete as it is considered one of the major degradation causing phenomenon in the durability of concrete in concrete technology. The primary variable being the introduction of Silica Fume as a 10% replacement, bentonite 20% and silica fume+Bentonite 20% by weight of cement. Super plasticizer is also used in order to attain high strength and make the concrete more workable in the presence of silica fume. A concrete batch with a proper mix design was prepared and aiming at a high strength of 6000psi. Part of the batch was tested for 28 days Strength and part of it was subjected to cyclic wetting and drying exposure to sulfate rich environment, the solution being 50 g/l of Na2SO4. The quality of concrete was measured by Ultrasonic Pulse Velocity testing for 20 days which showed an appreciable improvement in the resistance to sulfate attack by the Silica Fume made cylinders whereas the Normal concrete cylinders were affected severely in the sulfate environment. The same concrete cylinders were tested for compressive strength under the Universal Testing Machine and the results showed an alarming reduction in strength of the normal concrete cylinders whereas the Silica Fume made and bentonite concrete cylinders showed small reduction in strength. The main conclusions derived from this project are that the use of Silica Fume leads to a better performance of concrete in sulfate rich environments although the strength may not be altered as desirable.

Other Details:

Manuscript Id	:	IJSTEV5I6014
Published in	:	Volume : 5, Issue : 6
Publication Date	:	01/01/2019
Page(s)	:	28-34

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