A Study on Pervious Concrete using Pumice and Electric Arc Air Cooled Blast Furnace Slag Aggregates

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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A Study on Pervious Concrete using Pumice and Electric Arc Air Cooled Blast Furnace Slag Aggregates (IJSTE/ Volume 3 / Issue 09 / 016)

VI. RESULTS AND DISCUSSIONS: Compressive Strength For compressive strength test cubes of measurements 150mm x 150mm x 150 mm were made for concrete. Vibration was given to the moulds by utilizing the table vibrator. The top surface of the sample was levelled and wrapped up. Following 24 hours the samples were demoulded and were exchanged to curing tank wherein they were permitted to cure for 7 days. Following 28 days curing, these specimens were tried on computerized pressure testing machine according to I.S. 516-1959. The failure load was observed and noted.

Table – 1 Compressive Strength Test after 28 Days for Conventional aggregate Weight (KG) 7.34 8.09 8.24

Peak Load (KN) 279.7 315.92 290.65

Peak Stress (MPa) 12.43 14.04 12.91

The average peak stress is 13.12MPa. Table - 2 Compressive Strength after 28 Days for Electric arc air cooled blast furnace slag Weight (KG) Peak Load (KN) Peak Stress (MPa) 8.16 348 15.46 7.92 375 16.644 8.03 398 17.773

The average peak stress is 16.62MPa. Table - 3 Compressive Strength Test after 28 Days for Pumice Weight (KG) Peak Load (KN) Peak Stress (MPa) 3.12 57.8 2.56 3.44 40.5 1.8 3.8 54.6 2.42

The average peak stress is 2.26MPa

Fig. 1: Compressive Strength in 28 Days of All Aggregates

Flexural Strength Test Flexural strength also known as modulus of rupture, bend strength or fracture strength, a mechanical parameter for brittle material, is defined as a material’s ability to resist deformation under load.

Table - 4 Flexural strength after 28 days for conventional aggregate Cement Aggregate Ratio Flexural Strength in Mpa 1:5 4.76 1:5 3.6 1:5 4

The average flexural strength is 4.12MPa. Table - 5 Flexural strength after 28 days for electric arc air cooled blast furnace slag Cement Aggregate Ratio Flexural Strength in Mpa 1:5 4.5 1:5 5 1:5 4

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A Study on Pervious Concrete using Pumice and Electric Arc Air Cooled Blast Furnace Slag Aggregates (IJSTE/ Volume 3 / Issue 09 / 016)

The average flexural strength is 4.5MPa Table - 6 Flexural strength after 28 days for pumice aggregate Cement Aggregate Ratio Flexural Strength in Mpa 1:5 0.5 1:5 1 1:5 1.4

The average flexural strength is 0.96MPa

Fig. 2: Flexural Strength of All Aggregates in 28 Days

Split Tensile Strength The tensile strength is one of the basic and important properties of the concrete. The concrete is not usually expected to resist the direct tension because of its low tensile strength and brittle nature.

Table - 7 Split tensile strength after 28 days for conventional aggregate Weight (KG) Peak Load (KN) Peak Stress (MPa) 10.54 150 2.11 9.81 170 2.40 10.7 130 1.84

The average of tensile strength is 2.11MPa Table - 8 Split tensile strength after 28 days for electric arc air cooled blast furnace slag Weight (KG) Peak Load (KN) Peak Stress (MPa) 11.11 160 2.26 10.81 150 2.11 10.92 130 1.85

The average of tensile strength is 2.073MPa Table - 9 Split tensile strength after 28 days for pumice aggregate Weight (KG) Peak Load (KN) Peak Stress (MPa) 5.23 60 0.84 5.67 40 0.56 5.8 50 0.707

The average of tensile strength is 0.702MPa.

Fig. 3: Split Tensile Strength of All Aggregates

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A Study on Pervious Concrete using Pumice and Electric Arc Air Cooled Blast Furnace Slag Aggregates (IJSTE/ Volume 3 / Issue 09 / 016)

VII. CONCLUSION      

Compressive strength of conventional pervious concrete, air cooled blast furnace slag concrete and pumice concrete in 28 days was obtained 15.84MPa, 18.75MPa and 2.81MPa respectively.

Compressive strength of normal conventional pervious concrete is relatively lower than blast furnace slag pervious concrete Flexural strength of conventional pervious concrete, air cooled blast furnace slag concrete and pumice concrete was obtained 4.48MPa, 4.91MPa and 1.2MPa respectively.

Split tensile strength of conventional pervious concrete, air cooled blast furnace slag concrete and pumice concrete was obtained 2.26MPa, 2.33MPa and 0.88MPa respectively Compressive strength of light weight pumice pervious concrete is very low due to which it cannot be used for pavement purpose.

By using blast furnace slag we get to utilise an industrial waste and at the same time we also get higher compressive strengths than normal pervious concrete.

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