IJSTE - International Journal of Science Technology & Engineering | Volume 3 | Issue 09 | March 2017 ISSN (online): 2349-784X
A Study on Pervious Concrete using Pumice and Electric Arc Air Cooled Blast Furnace Slag Aggregates Chitra Shijagurumayum PG Student Department of Civil Engineering KIIT University Bhubaneswar-751024, India
Anushree Khare PG Student Department of Civil Engineering KIIT University Bhubaneswar-751024, India
Saransa Sahoo PG Student Department of Civil Engineering KIIT University Bhubaneswar-751024, India
Abstract Pervious concrete can be made by incorporating different types of aggregates. In this paper, it is made using three types of coarse aggregates i.e. conventional aggregate, pumice aggregate (light weight aggregate) and electric arc air cooled blast furnace slag (heavy weight aggregate). The aggregate cement ratio was taken as 1:5. Compression test followed by split tensile and flexural strength test were performed after curing the concrete for 28 days. The results arrived at suggest that it should be used in flat works application. Keywords: Electric Arc Air Cooled Blast Furnace Slag, Pumice Aggregate ________________________________________________________________________________________________________ I.
INTRODUCTION
Pervious concrete are made using cement, coarse aggregate, admixtures, water and slight or no sand. It can be conveniently used where the load applied would not be large. Some examples include footpath, greenhouses etc. II. MIX PROPORTION The water cement ratio was taken 0.35 and that of cement aggregate was taken as 1:5. III. DETERMINATION OF COMPRESSIVE STRENGTH Specimens of pervious concrete is taken and used for casting cubes 15 cm x 15 cm x 15 cm. This concrete was emptied in the mould and properly tempered so that there are no voids. The moulds are demoulded after 24 hours and specimens are kept in water for curing. The aggregate’s largest nominal size should not exceed 20mm to 10 mm. IV. DETERMINATION OF TENSILE STRENGTH The specimen was of 150mm diameter and 300mm height cylinder was prepared. A split tensile strength test was performed for all samples cured for 28 days as specified in ASTM C496. This test measures the tensile strength of a concrete sample by compressing a cylinder through a line load applied along its length. A uniform tensile stress is created over the cylinder diameter along the plane of loading. The maximum tensile stress occurs at the center of cylinder. V. DETERMINATION OF FLEXURAL STRENGTH Flexural strength is one measure of the tensile strength of concrete. It is measure of an unreinforced concrete beam or slab to resist failure in bending. The flexural strength is expressed as modulus of rupture (MR) in psi (MPa) and it is obtained by standard test methods ASTM C 78 (third point loading) or ASTM C 29 (centre-point loading).Flexural strength of conventional concrete is about 10 - 20 percent of compressive strength depending on the type, size and volume of coarse aggregate used. According to Yu Chen et al, (19) reported that flexural strength of pervious concrete may be more sensitive to change in porosity than compressive strength. Specimens were tested in third point loading and calculated flexural strength.
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