the physical and mechanical properties of cement-based composites reinforced with ceramic and polymer exposed to sulfate attackk

the physical and mechanical properties of cement-based composites reinforced with ceramic and polymer exposed to sulfate attackk


the physical and mechanical properties of cement-based composites reinforced with ceramic and polymer exposed to sulfate attackk

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: the physical and mechanical properties of cement-based composites reinforced with ceramic and polymer exposed to sulfate attackk

ارائه دهنده: Provider: Reza Rezvanizadeh

اساتید راهنما: Supervisors: Dr.Shahab Kazemi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr.Mohsen Sheikhi and Dr.Hamid Esfahani

زمان و تاریخ ارائه: Time and date of presentation: 06/02/2024 11:00 AM

مکان ارائه: Place of presentation: Class 9

چکیده: Abstract: In this research, ceramic composite samples reinforced with sand were produced by water and polyurethane polymer. The aim was to investigate the engineering properties of samples produced in different corrosive environments. To investigate the destructive effect of corrosive environments, the samples produced in different amounts of water, polyurethane polymer, and sand were immersed in the electrolytes of 10 and 5% caustic soda and 10 and 5% sulfuric acid for 70 days. Next, to characterize the samples after immersion, the samples were examined by mechanical and physical tests. To check the physical properties, a densitometry test was used. The results of the densitometry test showed that the density of the samples immersed in sulfuric acid is about 10-20% lower than the samples immersed in caustic soda. In order to check the mechanical properties of the samples, a pressure test was used. The pressure test results showed that the strength of water-produced samples is higher than the samples produced with polyurethane polymer. On the other hand, it was found that if sand is used and composite concrete samples are produced, the strength of the samples increases by 75%. Meanwhile, in the samples produced with polyurethane, which do not have sand-reinforcing particles, the strength of the samples decreased by 95% when the amount of polyurethane increased from 9% to 32%. In the samples produced with water (without sand), the strength decreases by 80% with the increase of water content from 9% to about 18%, and then with the increase of water content, the strength improves to about 22%. The strength improvement is not to the extent that it can reach the strength of the samples produced with 9% water. Meanwhile, the strength of the composite samples produced with polyurethane was independent of changes in the amount of polyurethane. The results of the compressive strength test showed that the strength of samples immersed in sulfuric acid electrolytes is generally 20-30% weaker than the strength of samples immersed in caustic soda electrolytes. The results of electron microscope imaging showed that the samples produced with water have more cohesion and continuity in their microstructure than the samples produced with polyurethane polymer. On the other hand, the samples immersed in sulfuric acid electrolyte had many cracks in their microstructure, while the samples immersed in caustic soda did not have these cracks