Production of low permeability concrete

This research aims to study the feasibility of producing low permeability concrete using bentonite. A comparison between concrete mixes with bentonite and the mixes with addicrate as a chemical addition for reducing the permeability was investigated. The impact resistance of this type of concrete was investigated. Two types of coarse aggregate (dolomite and gravel) were used. Bentonite with percent ۰, ۱, ۲, ۳, ۴, ۵, ۱۰, ۱۵ and ۲۰ % as a replacement of cement weight was used. Addicrete DM۲ with percent ۰, ۰.۲۵, ۰.۵, ۱ and ۲ % of cement weight was used. The mechanical properties of the mixes (compressive, tensile and flexural strength) and the impact test were evaluated. Also, the permeability coefficient for the different mixes was calculated. The results clear that; ۵ percent of bentonite was the optimum value to produce low permeability concrete. Also, the performance of the concrete was improved due to the use of bentonite. Out of this research, this type of concrete can be used in the marine structure which exposed to impact loads like dams and wears.This research aims to study the feasibility of producing low permeability concrete using bentonite. A comparison between concrete mixes with bentonite and the mixes with addicrate as a chemical addition for reducing the permeability was investigated. The impact resistance of this type of concrete was investigated. Two types of coarse aggregate (dolomite and gravel) were used. Bentonite with percent ۰, ۱, ۲, ۳, ۴, ۵, ۱۰, ۱۵ and ۲۰ % as a replacement of cement weight was used. Addicrete DM۲ with percent ۰, ۰.۲۵, ۰.۵, ۱ and ۲ % of cement weight was used. The mechanical properties of the mixes (compressive, tensile and flexural strength) and the impact test were evaluated. Also, the permeability coefficient for the different mixes was calculated. The results clear that; ۵ percent of bentonite was the optimum value to produce low permeability concrete. Also, the performance of the concrete was improved due to the use of bentonite. Out of this research, this type of concrete can be used in the marine structure which exposed to impact loads like dams and wears.

Keywords:

Bentonite , Permeability , Mechanical properties , Impact