DURABILITY ASSESSMENT OF POLYPROPYLENE HIGH STRENGTH CONCRETE IN MARINE ENVIRONMENT
Publication Date : 01/02/2016
This paper assesses the effect of polypropylene fibres (PPF) on the durability of high strength concrete exposed to marine environment. The polypropylene fibres were obtained from northern bag manufacturing co. Ltd, Kano, Nigeria and were characterized. The compressive strength of PPF high strength concrete was investigated on grade 50 and 60 concrete of mix ratio of 1: 1.13: 2.39 and 1: 0.82: 1.75 with water cement ratio of 0.38 and 0.34, respectively. Chopped polypropylene fibres of 35 mm long were added to the concrete mix at 0, 0.1, 0.2 and 0.3 %, respectively by volume of concrete. A total of thirty six 150 x 150 x 150 mm cubes of each grade of PPF high strength concrete were tested for compressive strength at 7, 28 and 56 days of curing in clean water. Also twelve 150 x 150 x 150 mm cubes of each grade of concrete were tested for water absorption after curing for 28 days, and a further twelve cubes of each grade of concrete were initially cured in clean water for 28 days before exposure to Sea water for 28 days and tested in compression. The results of the investigations showed that addition of up to 0.2 % PPF increased the compressive strength and resistance of high strength concrete exposed to marine environment. The water absorption of high strength concrete decreased with increase in PPF addition.
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