NGHIÊN CỨU THỰC NGHIỆM sử DỤNG SỢI POLYPROPYLENE TRONG SẢN XUẤT BE TÔNG BỌT

Abstract

To save natural resources, reduce the dead load as well as enhance the flexural strength, this study is to investigate into the use ofpolypropylene (PP) fiber in the production of lightweight foamed concrete (LFC). Four mixtures were designed with a density of 1000 kg/m3 and a constant water-to-binder ratio o f 0.25. Sand and ground granulated blast furnace slag contents were equal to 25% and 40% total amount o f binder, respectively. The ppfiber contents were 0, 0.3, 0.6, and 1%) total amount o f binders, and the effect ofppfiber contents on the engineering properties o f LFC was investigated. The test results indicate that the presence ofppfiber reduces the unit weight o f fresh and hardened concrete, thermal conductivity, and ultrasonic pulse velocity but increases the compressive strength and flexural strength. The mixture with I% p p fiber yields the highest compressive strength and flexural strength, and the lowest unit weight and thermal conductivity. The ppfiber plays a very important role as reinforcement in conventional concrete to enhance the compressive strength, and increase the flexural strength significantly.
Keywords: Polypropylene fiber, lightweight foamed concrete, ground granulated blast furnace slag, industrial waste.