الفهرس 
Table of ContentsOnly 14 pages are availabe for public view
 |  | from | 134 |  |  |
| | | from | 134 | | |
Abstract
Abstract 1: -Introduction: - The industry of concrete was to be developed in the last few decades especially high- performance concrete which was one of the most important fields in this part of development. Concrete buildings depend upon its strength without any concentration on its durability and its resistance to environment affection. More attention should be paid to durability-based approach in all stages of building. Such stages included designation, execution, operation and maintenance. One of the most influential ways of moving towards durability-based approach was to explore high-performance concrete (HPC). The compressive strength of high-performance concrete was considered to be about (55 -150MPa). Using high-performance concrete saved amounts of concrete, times of building and money for transporting. It was essentially used in bridges and high building owing to its high strength and durability. Basalt fibers are natural fibers that are produced from natural basalt rocks at a temperature of 1400°C. Basalt fiber manufacturing process is considered environmentally friendly (green product) as it requires less energy consumption than glass fibers and does not produce harmful substances during the manufacturing process. Among its most important advantages is that it does not rust, has high tensile strength. Basalt fibers can be used as an alternative to glass, carbon, steel and other synthetic fibers due to their excellent mechanical and environmental properties. 2: - Research scope: - The scope of this research is to study the effect of basalt fibers on high-performance concrete in its fresh and hardened properties. 3: - Research objective: - The current research is conducted to investigate the effect of basalt chopped fiber (BF) addition on impact resistance and mechanical properties of high-performance concrete (HPC). Due to BF’s friendly relationship across environment, it gains some popularity among researchers especially in the construction field. Within the scope of the current study, three various lengths (3, 12, and 18 mm) and five-volume fractions (0.075%, 0.15%, 0.3%, 0.45%, and 0.6%) of BF are under the field of study. Concrete specimens are evaluated based on compressive strength, splitting tensile strength, flexural strength, and drop-weight impact testing. Additionally, the microstructure of BF high performance concrete is also investigated by scanning electron microscopy (SEM). 4: - Summary of Study: - The results showed that the BF’s addition has little effect on concrete compressive strength which apparently improves their splitting tensile and flexural strengths. However, it significantly enhances its impact resistance. Scanning electron microscopy (SEM) shows a good bond between basalt fibers and the matrix interface.