Study Effect of Vibration of surface liquid , Temperature & Concentration on the surface Tension of Water

Abstract

Self compacting concrete (SCC) can be classified as high performance concrete. As the name suggests, it does not require to be vibrated to achieve full compaction. This offers many benefits and advantages over conventional concrete. This study aims to evaluate the fresh and hardened properties of SCC produced by using locally available materials. This study includes also the influence of different percentages of polypropylene fibers (PPF); added by about (0, 0.5, and 1) % by the total volume, on the same properties. To achieve these aims six different mixes of SCC (with and without fibers) are mixed, tested, and evaluated. Also, this study aims to identify the mechanical properties of SCC specimens (with and without fibers) at high temperatures, including compressive and flexural strengths. The effect of different heating rates (25, 100, 400, and 700)^oC on the mechanical properties of SCC is studied. The difference of the mechanical properties between normal and high-strength SCC is identified. The test results show that all the mixes have good consistency and workability from the filling ability and passing ability point of view. Also, the addition of PPF gives a homogeneous and cohesive mix with a slight decrease in workability. However, the addition of PPF causes a slight reduction in compressive strength which increased as the percentage of PPF increases, while this addition causes a noticed increment in flexural strength. Also, it is found that compressive and flexural strengths decreased as the heating temperature increased.