نوع مقاله : مقاله پژوهشی
نویسنده
عضو هیئت علمی دانشگاه پدافند هوایی خاتم الانبیاء (ص) ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
The effect of concrete porosity on water absorption and stability of cement products is very important. The permeability of concrete allows the entry of reactive molecules that can cause the concrete to lose its chemical stability. Concrete with low permeability increases the resistance to the penetration of water, sulfate ions, chloride ions and other pollutants. This property is related to the pore structure. including small cracks in the contact spaces between aggregate and cement mortar. The so-called pore structure includes capillary pores that have different volumes and sizes. This structure is the result of the cement hydration reaction and consists of solid materials and pores. The porous network of cement paste forms the matrix necessary for liquid penetration into the concrete. The development of this network is influenced by concrete properties, initial sealing conditions, its duration, test age and weather conditions. Temperature, processing time and humidity are also important factors affecting the pore structure. In this research, graphene oxide and silica nanoparticles were used to make nanocomposite concrete resistant to penetration. The results showed that by adding 0.05% of graphene oxide nanoparticles and 10% of silica nanoparticles, the compressive and tensile strength of concrete increased by 28.6% and 35%, respectively. Also, in water absorption tests, the manufactured sample absorbed 46% less water and its electrical resistance was 79% higher.
کلیدواژهها [English]
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