The ability to improve the tendency of hardened concrete in compression at elevated temperature was studied. Five mixes of fly ash were cast with a replacement amount of 0%, 10%, 20%, 30%, and 40% by cement mass. They were exposed to 400°C and held for 2 hours after water curing. The specimens have been cooled down to room temperature and then undergo a compressive test. This research aims to study the physical and mechanical properties of fly ash concrete after being exposed to elevated temperatures. A digital microscope was used to analyse the formation mechanism of microstructure in concrete. Fly ash was used to produce high fire resistance concrete with 100 mm x 100 mm x 100 mm concrete cube. Sample 4 with 30% fly ash has the highest compressive strength with 26 MPa after 28 days and 21 MPa after exposed to 400°C. The results show that concrete containing a high amount of fly ash has several improvements when exposed to elevated temperature. The concrete specimens were used to validate an interfacial transition zone (ITZ) in concrete. The microstructure features were discussed concerning their influence on the strength development of concrete.
Concrete is unquestionably the most desirable construction material, but, like any coin, italso has a negative side. In one way or another, the raw materials used in the production of concretehave a negative impact on the environment. Cement production releases carbon dioxide into theatmosphere, while aggregate production releases dust. The geology of the region where coarseaggregates were mined is also influenced by their extraction. Natural fine aggregates were replacedwith polyethylene terephthalate (PET) bottles in this analysis. PET Plastic aggregates wereproduced by little cutting of waste plastic bottle. Plastic is the most serious environmental problem,and it is having a rapid effect. Shredded waste plastic was used in concrete as a partial substitute fortraditional fine aggregate at 0%, 5%, 10%, 15%, and 20% by weight. The aim of this research wasto determine the compressive strength, microstructure of concrete, and the interfacial transition zoneof concrete (ITZ). The concrete with 5% fine aggregate replacement showed a possible outcome of21 MPa compressive strength, the control mix had the lowest percentage of 1.3 percent, and theconcrete with 20% PET plastic had the highest percentage of 9.8 percent. It can be concluded thatrecycled plastic aggregates can be used to replace fine aggregate in concrete up to 5% of thereplacement and can be used in non-load bearing structures where lightweight materials arepreferred
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