Apparently with two thirds of the earth's surface covered by water, it is evidently clear that water is one of the most important elements responsible for life on earth. It is not only vital for sustenance of life, but equally essential for socioeconomic development. Water is the unique gift of God and the basic requirement of life. Due to the high indulgence and exploitation of human being with nature, the global environment is changing every day. As a result the water resources are depleting gradually. The global fresh water shortage and food security issues related to the teeming billions of population necessitated the shifting of fresh water from agriculture to other more pressing uses. The country is facing the worst ever crises of water shortage for last many years, as water available for any given use has become increasingly scarce. The rapidly growing population, expanding of irrigation areas, and growing urban & Industrialization are putting more stresses on water resources. Therefore, building of more reservoirs and an effective management strategy are the needs of time. The problem of water shortage particular in Sindh is crucial as being the end user and lower riparian on the Indus basin irrigation system.

A b s t r a c t This research work mainly focuses on improving the concrete strength based on fiber reinforcement both in compression and tension. Concrete with various mix proportions containing dosage of Polypropylene (PP) fiber of lengths ranging from 13 to 25 mm with coarse aggregate replacement levels at 10%, 20%, and 30% by dismantled road aggregate were made and the compressive and tensile strengths were investigated. The experimental test results revealed high compressive and tensile strength at curing period of 28 and 56 days. The specimens tested observed that due to addition of fiber, the fibers could hold the matrix together even after extensive cracking and crushing. Net result of all these is to impart to the fiber composite pronounced post-cracking ductility which is absent in traditional concrete. In order to provide base for comparison, concrete specimens as a reference were cast without the addition of polypropylene fiber. Test result revealed that by adding polypropylene fibers at 6grams per one kg of cement a considerable improvement in the strength of concrete of 37.68 MPa and 43.59 MPa at 28 and 56 days respectively with 10% coarse aggregate replacement by recycled aggregate is achieved.

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