الفهرس 
HSC Constituent MaterialsOnly 14 pages are availabe for public view
 |  | from | 166 |  |  |
| | | from | 166 | | |
Abstract
The world concern about the global worming increased every day and this concern reflected on concrete industry. Egypt as one of the developing countries has a huge renewable resources of natural and vegetable materials. Natural fibers get attention from many researchers as one of the ecofriendly and sustainable building materials. In this research using four types of natural fibers from the environment of Sinai Peninsula in Egypt are studied as a concrete constituent material. This research aims to investigate and evaluate the effect of adding fibers on the performance of High Strength Self Compacted Concrete (HS-SCC). Palm, Thymelaea, Alhagi Graecorum and Aloe-Vera were used as natural fibers while glass and polyprobelene were used as synthetic fibers in concrete casting. Two fiber lengths (12 and 25 mm) were chosen to be studied in this research. Fresh concrete properties were investigated using slump flow test and J-ring test. Hardened concrete properties as compressive, indirect tensile and the flexural strengths were investigated. Durability was investigated using sorptivity test. Thirteen reinforced HS-SCC beams containing the optimum content for different types and lengths of the used fibers. Results showed a clear decrease in workability of HS-SCC with increase in fiber content. All types with both lengths reduced the workability of HS-SCC where Aloe Vera fibers were the worst among the four used natural types while polypropylene fibers were the worst among all types. All fibers with both lengths improved compressive, indirect tensile and flexural strengths of HS-SCC at the ages of 7 and 28-days where Alhagi Graecorum fibers were the best among the four natural types while glass fibers were the best among all types. According to sorptivity test results, Alhagi Graecorum fibers were the best among of the used types while the PP fibers were the worst. All fibers with both lengths increased the ultimate load and toughness of HS-SCC beams, where Alhagi Graecorum fibers were the best among the four natural types while glass fibers were the best among all used types.