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A Study of Crumb Rubber Modified Asphalt Slurry Seal Emulsions

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Description

Download A Study of Crumb Rubber Modified Asphalt Slurry Seal Emulsions. Civil Engineering students who are writing their projects can get this material to aid their research work.

Abstract

The suitability of Crumb Rubber (CR) to partially modifying bitumen in Asphalt Emulsion production for use as slurry seal was investigated.

Bitumen was replaced with 0%, 5%, 10%, 15%, 20% and 25% Crumb Rubber, and subjected to methyl blue, sand equivalency, cohesion, wet track abrasion (WTA) and loaded wheel tracks (LWT) tests.Preliminary tests: using Penetration, Softening point, Viscosity and Flash and Fire point tests were also performed on the bitumen.

Based on the result of the tests, optimum CR content of 17.5% was recommended for use, because it achieved a smooth texture, within mixing time of 200 Seconds and Cohesion at 30 and 60minutes of 23 and 28 Kg-cm respectively. WTA Loss of 365.2g/m2 , are within the limits specified by the International Slurry Seal Association.

Above the Optimum Crumb Rubber the texture of the mixture was not smooth enough for use as slurry sealant. Successful use of CR will serve as an effective way of converting rubber waste to beneficial use, thereby saving the environment and conserving bitumen.

Introduction

Roads are built by a high-tech process that involves the use of aggregate, heavy machinery, and the hard work of road crews. Carefully constructed roads last for decades.

However, the performance of the roads may be affected by wheel load pressure. To overcome the adverse effect of traffic on pavement, there is need for regular maintenance, whether it’s crumbling at the edges, developing pot holes, or cracking across the middle. One of the most important measures used in road maintenance is Crack Sealing.

There are several crack sealing materials in use in pavement; each designed to keep the road smooth and safe during its life. (Atkinson, 1997)

Roads endure enormous stress and strain as vehicle tires continually push and pull at paved surfaces. The faster or heavier the vehicle, the more the pavement is compressed and then tensioned.

Temperature changes, within 24-hour can cause expansion and contraction of the pavement sheet. Traffic and temperature create small surface cracks.

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