Durability of non-structural light fiber plates of cement base in freezing and thawing cycles

نوع: Type: Thesis

مقطع: Segment: masters

عنوان: Title: Durability of non-structural light fiber plates of cement base in freezing and thawing cycles

ارائه دهنده: Provider: Saleh Nouri Kurdistan

اساتید راهنما: Supervisors: Mahmoud Nili

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Fereydoun Rezaei-Mostafa moghadasi

زمان و تاریخ ارائه: Time and date of presentation: 2025

مکان ارائه: Place of presentation: 44

چکیده: Abstract: Cement-based lightweight fiber-reinforced non-structural panels are one of the new materials in the construction industry that are produced in a prefabricated form. The aforementioned panels can be used in the construction of interior and exterior walls, false ceilings, and facade cladding located in wet spaces inside buildings. The materials constituting these panels include cement, water, fibers, cement additives, and fine-grained materials, which are manufactured in thicknesses of 8 to 20 mm. These panels are connected to structural components by horizontal and vertical framing methods and are dry-attached. The use of these panels in cold regions requires that their behavior under the influence of freeze-thaw cycles be evaluated. In the present study, six mix designs with a water-to-cement ratio of 0.21 were prepared. Silica fume and slag were used as 25% by weight of cement as cement additives, and perlite was used as 50% by weight of sand. Polypropylene (PP) fibers and polyvinyl alcohol (PVA) fibers were used at 1.5% and 1% by volume of the mixture. The density, water absorption, compressive strength, compressive strength, flexural strength, and direct tensile strength of the samples were determined based on relevant standards. The aforementioned properties were re-evaluated after applying freeze-thaw cycles to determine the effect of the cycles on the properties. The results indicate that all designs can be classified in the light range. The use of PVA fibers increased the compressive strength of the sample by 37% compared to the designs containing PP fibers. The modulus of rupture of the designs before and after the cycles showed a linear relationship with the square root of the compressive strength. The use of PP fibers increased the ductility of the samples, while the samples containing PVA fibers had higher flexural and compressive strengths. The imaging results showed that the use of perlite accelerated the occurrence of cracks in the samples. The design containing perlite, slag, and silica fume with PVA fibers can be introduced as an optimal and environmental design in terms of durability, lightness, and significant reduction in cement consumption.

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