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Application of Waste Tyre Rubber Chips as Coarse Aggregate in Concrete

Z Muyen
Department of Farm Structure and Environmental Engineering, Bangladesh Agricultural University, Mymensingh 2202

F Mahmud
Department of Farm Structure and Environmental Engineering, Bangladesh Agricultural University, Mymensingh 2202

MN Hoque
Department of Farm Structure and Environmental Engineering, Bangladesh Agricultural University, Mymensingh 2202

Abstract/ Executive Summary:

The practicality and the engineering properties of portland cement concrete (PCC) and three types of rubberized PCC mixes prepared by partially replacing the conventional coarse aggregate with rubber were examined. The rubberized PCC mixes contained 5%, 10% and 15% waste tyre rubber chips as replacement of conventional coarse aggregate. Different physical and mechanical properties of the control (0% rubber chips) and the rubberized concrete samples were determined. A 5% replacement of conventional aggregates resulted in a 5% reduction of compressive strength, a 10% replacement resulted in a 26% reduction and a 15% replacement resulted in a reduction of 47%. A 5% replacement of conventional aggregates resulted in a 6% reduction of tensile strength, a 10% replacement resulted in a 33% reduction and a 15% replacement resulted in a reduction of 53%. A 5% replacement of conventional aggregates resulted in a 13% reduction of flexural strength, a 10% replacement resulted in a 33% reduction and a 15% replacement resulted in a reduction of 42%. Although concrete made from tyres had lower strength than the normal concrete, rubberized concrete can find its use in landscaping, sports field ground, architectural finishing, lightweight concrete walls etc.

Keywords: Rubberized concrete; Aggregate replacement; Compressive strength; Split tensile strength; Flexural strength

Location: Department of Farm Structure and Environmental Engineering, Bangladesh Agricultural University, Mymensingh 2202

Start Date:

End Date:

Program Area: Farm Mechanization

Commodity: Farm machineries

Objectives:

To the determined application of waste tyre rubber chips as coarse aggregate in concrete

Methodology:

Materials and Properties: The basic materials required for this study are: 1. Cement (OPC), 2. Fine aggregate (river sand; FM 1.49), 3. Water, 4. Coarse aggregate (Picked Khoa; 4.75-9.5mm), 5. Waste tyre rubber chips of size 15- 25mm. Testing of aggregates: The following tests were conducted for tyre rubber chips and khoa: 1. Sieve analysis, 2. Specific gravity and water absorption. Preparation of concrete mix: In this study, the cement: sand: coarse aggregate proportion used was 1:1.5:3 and the water cement ratio was 0.55. Slump test: Slump test was performed with the fresh concrete mix before the placing them into the moulds. Compressive strength: The concrete mixtures were placed in the 2.78 X 2.78 inch cube moulds. After 24 hours, the cubes were demoulded and after another 24 hours they were submerged in water for curing. The test method was followed according to ASTM Designation: ASTM C109 / C109M. Tensile strength: The cylinders used for the split- tensile strength test were 6 inch in length and 3 inch in diameter. The test procedure was followed according to ASTM designation C 496. Flexural strength: The required sizes of specimens for flexural strength were 3 in X 3 in X 12 in. The test procedure was followed according to ASTM designation C 78.

Source of Information: Progressive Agriculture 30 (3): 328-334, 2019

Article Link (Online Journal): DOI: https://doi.org/10.3329/pa.v30i3.45159

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The general objectives of this research was to evaluate the fresh and hardened properties of a concrete produced by replacing part of the natural coarse aggregates with an aggregate produced from locally available waste tyre. Workability of fresh concrete decreased with increasing percentage of rubber chips. Specific gravity is also seen to decrease with increase in rubber chips. The compressive, tensile and flexural strengths decreased with increase in rubber chip aggregate replacements; but the 5% replacement results are acceptable. Rubberized concrete can be used in non-load bearing members i.e. lightweight concrete walls, other light architectural units, thus rubberized concrete mixes could give a viable alternative to where the requirements of normal loads, low unit weight, Medium strength, high toughness etc. The overall results of this study show that it is possible to use recycled rubber tyre aggregates in concrete construction as partial replacement of mineral coarse aggregates with 5% replacement giving best performance results with compressive, tensile and flexural strengths reduction of 5%, 6% and 13% respectively compared to non- rubberized concrete. Rubberized concrete will give better performance than conventional concrete where vibration damping is required, such as in building as an earthquakes shock-wave absorber, in foundation pads for machinery, and in railway stations. Rubber aggregates in concreter should also make the material a better thermal insulator, which could be very useful.

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