نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشگاه علم و صنعت ایران
2 دانشگاه لرستان
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
It is very important to improve the strength and permeability characteristics of concrete mixtures used in concrete pavements in order to increase the performance and durability of these pavements. Meanwhile, the use of new materials to improve these characteristics in concrete pavements becomes important. Silica fume and polypropylene macro fibers are among the types of new materials in the pavement industry. The present research has evaluated the effect of silica fume on the resistance and permeability characteristics of air-entrained concrete pavements containing macro polypropylene fibers in different amounts. In this regard, silica fume in consumption amounts of 5% and 7.5% and polypropylene macro fibers in consumption amounts of 0.9 kg/m3 and 1.8 kg/m3 were added to the reference concrete mixture. Also, the strength properties including compressive, splitting tensile and flexural strength and permeability properties including water absorption and penetration depth under the pressure of concrete mixtures have been evaluated according to standard methods. The results indicated that silica fume significantly changes the strength and permeability properties of concrete mixtures containing fibers. With the addition of silica fume, the compressive, tensile, and flexural strength of concrete increased to 44%, 54%, and 27%, respectively. Also, silica fume decreased the amount of water absorption and penetration depth up to 12 and 48 percent. The consumption of silica fume also had a significant effect on the change in the strength behavior and permeability of the concrete pavement. It was observed that among the strength properties, silica fume had the greatest impact on the splitting tensile strength and among its permeability properties, it had the greatest impact on the penetration depth of concrete. In addition, the change in compressive strength is greater than the flexural strength of the concrete pavement.
کلیدواژهها [English]
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