حمايـة الأســس الخرسـانية المسـلحة من تأثير الميـاه الجوفيـة باسـتخدام مانـــــع الرطـوبة

Abstract

Previous research indicated that; the addition of water-proof additives to a concrete mix will increase the hardened concrete water tightness, but it will reduce its strength. Normally, reinforced concrete footings are subjected to wetting and drying cycles due to the rise and fall of underground water levels. These cycles considerably reduce concrete durability, and also reduce the effective service life of reinforcement, due to its corrosion. In this research, experiments have been done to monitor the effect of adding different percentages of water-proof additive (2, 4, and 6) % by the weight of cement used in the concrete mix. Results have shown the reduction percentages of permeability, compression, splitting, and flexural strengths in the hardened concrete. Finally, the optimum percentage of the water-proof additive is reached, and a reduced percentage of concrete strength is suggested to be used during reinforced concrete footing design.