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Corresponding Author

Seleem, M.

Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

One of the most famous problems in concrete Technology is reducing the water cement ratio (w/c) to obtain high strength concrete. An innovative method 10 do so is to compress the freshly caste concrete under pressure using special Trains. The method remarkably reduces the water-cement ratio through expelling the excess water from the mix. In addition, compressing the freshly cast concrete resulting in packing the concrete particles together which reduces the voids and increase the interlocking between aggregates. Consequently, the resulting concrete from this process has higher compressive strength, lower water-cement ratio. In addition, the uses of natural fiber add a new green product, or in other words environmental friendly concrete composites can be produced through recycling the natural fibers instead of burning or adding a burden to the already exhausted environment. In this research, a comprehensive testing program is performed to study the effect of using natural and artificial fibers in improving the strength properties and failure modes of freshly cast concrete. Different types of fibers were used including rice straw, flax fibers, date palm fibers, and polypropylene. Also, the studied parameters included the fiber volume fraction and the pressure applied into the fresh concrete. The evaluation was based on measuring compressive strength, tensile strength and mode of failure of the produced fiber reinforced concrete. Results indicated that although the used fibers didn't enhance either the compressive or the tensile strengths, they change the mode of failure to be safe.

Keywords

freshly compressed concrete; fiber concrete; natural fiber; polypropylene fibers; Strength; Mechanical Properties

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