The main idea of this study is to find the effect of steel fiber on the strength and internally curing of self-consolidated concrete (SCC), by using lightweight aggregate (LWA) from available porcelain. The work includes two stages; the first stage involved making several experimental mixes and then choosing the one that corresponds to international standards with natural properties. The second stage was adding lightweight aggregate (LWA) by replacing 15% of sand with saturated fine lightweight aggregate (LWA) as internal curing material to study the change in the Mechanical properties of SCC. Four concrete mixes were used with different volume fractions of hooked steel fibers were incorporated 0%, 0.5%, 1%, and 1.5%. Results showed that adding steel fibers provides a slight increase in compressive strength while significant enhancement in tensile properties was observed. Furthermore, replacement of fine aggregate by (LWA) causes an increase in hydration which leads to higher compressive and tensile strengths. Results of the rate of absorption indicate that adding steel fibers has beneficial effects.
The development of pedestrian bridge construction, ranging as it does, from a simple tree trunk, laid a cross a stream, through to today's spectacular three-dimensional support structures. Limited resources, environmental concerns, economic feasibility as well as the cost; are very important factors. These factors in addition to safety, durability and aesthetics should be considered in the design and construction processes for Pedestrian bridges. Therefore, it’s important to look for alternative construction materials that verify most of these factors. Waste rubber tire is a material that can be used to develop new forms of Pedestrian bridges. In this research, a simple experiment was conducted to simulate the real pedestrian bridge using waste rubber tire. The use of waste rubber tire showed positive results as a structural member in carrying loads. Consequently, it can sustain the safe passing of pedestrians. In addition, the use of fixed boundary conditions has reduced the central deflection of the bridge span to about fifty percent.
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