A predictive model of the effective tensile and compressive strengths of concrete considering porosity and pore size:
سال انتشار: 1399
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 199
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شناسه ملی سند علمی:
ACEACONF01_062
تاریخ نمایه سازی: 17 فروردین 1400
چکیده مقاله:
Cement is a chemical product that has adhesive properties and hardens due to contact with water and the resulting product has a high durability and resistance to water and moisture. Cement hardens when mixed with sand and water and is a solid body. It forms a unit called concrete. The role of cement in concrete is only as a binder of stone grains to each other and does not play a role in the strength and fertility of concrete. In a broad sense, any material or compound that is composed of a cementations adhesive. Concrete can be made from different types of cement as well as pozzolans, kiln slag, additives, sulfur, additives, polymers, fibers, etc. Ultra-high performance concrete (UHPC) has ultra-high material performance including high strength and high flow ability. However, its tensile strain capacity is generally lower than that of high ductile cementations composite. This study experimentally investigated the effect of hybrid combinations of straight 0.2 mm diameter steel fiber and various microfibers on the mechanical properties of UHPC. Four types of hybrid fiber reinforced UHPCs including steel, basalt fibers, polyvinyl-alcohol, and polyethylene fibers were designed and then compressive strength, density, and tensile behavior were investigated. Test results showed that combining a synthetic fiber with high strength, such as PE fiber, and steel fiber can improve the tensile behavior of UHPC and basalt fiber was effective for improving the tensile strength Of UHPC.
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نویسندگان
Mohammad hasan nezafat manzari
Master student of civil engineering, structural orientation, Shiraz State University