نوع مقاله : مقاله پژوهشی
1 استادیار، گروه عمران، دانشگاه پیام نور تهران شمال، تهران، ایران
2 دانش آموخته کارشناسی ارشد، واحد بین المللیکیش، دانشگاه پیام نور کیش، ایران
عنوان مقاله [English]
Roller Compacted Concrete (RCC) has no slump and is compacted by rollers; it is widely used in pavement construction of concrete roads due to its advantages. RCC reinforcement by armature is not possible due to special implementation circumstances. Therefore, researchers have been seeking ways to improve its ductility properties, and flexural strength. The use of steel fibers as part of the mix increases the resistance, but the modulus of rupture remains unaffected. Accordingly, the use of a thin layer of fine-grained concrete reinforced with woven fiber networks greatly increases the resistance in the RCC samples. Roller Compacted Concrete Pavements (RCCP) may be used in light and heavy traffic routes; the RCC set in this type of pavement has the features of high strength, low manufacturing costs and low maintenance levels. The current paper examined the properties of RCC and evaluated its set on the pavement. The current paper analyzed the results of the implementation of three general schemes including RCC, RCC with Polypropylene fiber content and RCC with Polypropylene fiber and Pozzolanic materials (silica fume, fly ash and limestone powder) content in RCC performance improvements. We examined properties such as compressive and flexural strength, the amount of expansion and contraction, and water absorption to evaluate the performance of the above mixtures. Experimental results showed polypropylene fibers improve RCC mechanical properties including compressive strength, bending strength and durability in corrosive environments. Schemes contained polypropylene fibers and pozzolanic materials samples indicated better properties compared to the samples with mere fiber propylene content. Meanwhile, schemes contained propylene fibers and silica fume showed best strength results in addition to concrete durability, compared to other samples.