(The effect of cement substitute materials on the flexural behavior of fiber concrete in the sea environment)

The existence of various cracks with welding origin in concrete structures is one of themost common problems. The presence of these cracks reduces the load, the entry of ions,and finally allows us to exploit. Fibers can reduce or delay crack propagation. Greenconcrete is environmentally friendly in which the cement or components that make it upby replacing waste materials instead of natural raw materials, reduce environmentaldamage and prevent greenhouse gas emissions. Among the substitute materials forcement, we can mention Microsilica and metakaolin. Microsilica is a type of silicondioxide that is obtained in powder form from the production of silicon alloy. Also,metakaolin is a group of cement substitute materials that react with calcium hydroxideand form a mixture of adhesive and pseudo-cement, which can be a substitute for cementin concrete production. According to the limited research conducted in the field of thesimultaneous use of fibers with cement substitute materials in concrete and investigatingthe synergistic effect of these two materials on the flexural strength of concrete, in thepresent article, the mechanical behavior of environmentally friendly concrete containingpolypropylene fibers is studied and investigated. A large volume of the earth's surface ismade up of seas and oceans. One of the environments used for research and constructionof coastal and offshore concrete structures is the sea environment. Among the concretesreinforced with polypropylene fibers investigated in the resistance laboratoryenvironment, metakaolin and Microsilica are added respectively.

Keywords:

Flexural strength , polypropylene fibers , cement replacement material , tidal zone