30-01-2013, 12:12 PM
USE OF DISCRETE FIBER IN ROAD CONSTRUCTION
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ABSTRACT:
New materials and construction techniques are required to provide Civil Engineering with alternatives to traditional road construction practices. Traditional techniques have not been able to bear the mixed traffic load for a long time. Therefore the pavement requires overlaying. To overcome this problem fiber inclusion in pavements is adopted nowadays. This paper highlights on the use of discrete fiber in road construction. Recently Geosynthetics have been used to reinforce and separate base course material for aggregate-surfaced roads and flexible pavements. Inclusion of discrete fibers increases shear strength and ductility.
INTRODUCTION:
Traditional road construction practices require alternative materials and techniques. Quality construction materials are not readily available in many locations or are costly. New techniques available are expensive and require skilled labour and special equipments. Recently Geosynthetics have been used to reinforce and separate base course material for aggregate-surfaced roads and flexible pavements.
Sand-fiber stabilization uses common construction equipments and requires no special construction skills. Sand-fiber stabilization is applicable for a wide variety of sands and silty sands found around the world. This method is used for expedient road construction over loose sands.
MIXING PROCEDURE:
An appropriate amount of sand was placed in the mixing container. Then the required water is mixed into the sand in small increments to ensure uniform coverage. The fibers are mixed in small increments using a two-bladed mortar mixing bit powdered by an electric drill. Take care during the mixing procedure to ensure a uniform sand-fiber mixture.
COMPACTION:
Compaction is required for the mixture densification, which is done, in different layers to get more stable layers. The idea of compaction procedure can be obtained by study of compaction test in which sand-fiber mixture is placed in a high cast iron split mold and then densification in different layers is performed by hammering. Generally, up to 20 or more blows.