Laboratory Investigating the Strain of Standard Concrete Specimenwith FRP and Nano Silica Fiber Coating

It is important to prevent or reduce human and financial losses caused by earthquakes in theworld. One of the activities carried out in this field today is the examination of existingbuildings to evaluate the structures and identify their weaknesses and, if necessary,retrofitting. The use of FRP fibers in concrete members is considered as a new method forstrengthening the structure. Also, today, additives such as nano-silica are used to increase theefficiency and strength of concrete. Therefore, the laboratory examination of nano-silicaconcrete samples reinforced with fibers is important to understand the behavior of thestructure. In this research, the results of a laboratory study on the strain and compressivebehavior of nano-silica concrete reinforced with four different models of FRP fibers areinvestigated. For this purpose, ۴۵ samples were subjected to pressure test at the ages of ۷, ۱۴and ۲۸ days. All samples were made with nano-silica at the mixing rate suggested by thefactory, which includes ۹ control samples without fibers and ۳۶ samples with fibers. Ingeneral, by comparing the results, it is clear that the samples reinforced with fibers andcombined with nano-silica have different plasticity behavior, which should be considered bydesigners in performance base design.

کلیدواژه ها:

Pressure strain ، Nano silica ، FRP fibers ، retrofitting