Experimental Investigation on Polypropylene Fiber Reinforced Concrete With Artificial
The paper presents research work of experimental investigation on polypropylene fiber reinforced concrete by replacing river sand to artificial sand with and without admixture. Use of fiber reinforce polymer in civil engineering increase rapidly. Various type of fiber is used such as glass, carbon, steel, asbestos, polyester and polypropylene. The various experimental investigations for determination of properties of polypropylene fiber are discussed in paper work. This paper presents the effect of polypropylene (PP) fibers on various properties of concrete such as compressive strength, tensile strength, workability, and fracture properties with various content of fiber(0% ,0.5%,1.0%,1.5%). The result of this present investigation indicates that by adding of 0.5% of polypropylene fiber shows maximum compressive and tensile strength.
Study on Effect of Carbon Steel Fibers and Polypropylene Fibers on Self Compacting Concrete
The effect of carbon steel fibers and polypropylene fibers on self compacting concrete was studied in this paper. The self compacting concrete is a concrete that can be placed and compacted by its own weight. Self compacting concrete provides several economic and technical benefits and the use of fibers in self compacting concrete extents its possibility. Various researchers were performed the slump flow test, compressive strength test and flexural strength test to study the effect of fibers on fresh and harden properties of self compacting concrete. Introduction: self compacting concrete is consider as a concrete that can be placed and compacted by its self weight and at the same time it is cohesive enough to be handled without segregation and bleeding. It can fill all the formworks even in congested reinforcement with little or no vibration effort. Self compacting concrete is proving desirable achievement to retard the problem associated with normal concrete. Due to its high deformability and resistance to segregation and bleeding, it has the capacity to fill the form work even in formwork with highly congested reinforcement. In traditional concrete due to lack in vibration increase the entrapped air voids and decrease the durability and strength of concrete this phenomena can avoid with use of self compacting concrete. There are two types of fibers are used in this study: carbon steel fibers and polypropylene fibers. Carbon steel fiber is different than normal steel fibers. The base material of carbon steel fiber is carbon steel wire whereas in normal steel fiber base material is cast iron wire. The tensile strength of carbon steel fiber is two to three times more than that of normal steel fibers. Carbon steel fibers increase the compressive strength, flexure strength and tensile strength of concrete. Whereas polypropylene fibers act as a bridge to retard cracks and cracks propagation. Literature review: Syal T. et al. (1) were investigated the workability and compressive strength of steel polypropylene hybrid fiber reinforced self-compacting concrete. They conclude that with the addition of 0.5% of fiber content by volume, maximum compressive strength of HyFRSCC was increased by 11.04%. Abbas AL-Ameeri(2) published a paper on effect of steel fibers on self compacting concrete. Here they found that 0.75% to 1% of steel fibers gave best performance for compressive and tensile strength. He was found that 1.5% of steel fibers contain have a best effect on hardened property but the worst effect on fresh properties Kamal M.M. et al. (3) were studied on effect of polypropylene fibers on development of fresh and hardened Properties of recycled self compacting concrete. They conclude that at optimum volume fraction of polypropylene fibers; the mixes with 25, 50, 75 and 100% of crushed ceramic yields to improve in the compressive strength by 18.4, 26.3, 21.2 and 14.8%, respectively. B. Krishna Rao and Professor V. Ravindra (4) published a paper on steel fiber reinforced self compacting concrete incorporating class f fly ash. They conclude that the optimum volume fraction and aspect ratio of fiber for better performance in terms of strength was found to be 1.0 percent and 25.
A New Vacuum Pressure Infiltration CFRP Method and Preparation Experimental Study of Composite
In order to prepare a carbon-fiber-reinforced polymer composite (CFRP) with ideal microstructure and properties, a new vacuum pressure infiltration CFRP method is proposed based on an analysis of existing CFRP preparation process methods. Research on composite material preparation systems was carried out by using this new method principle. The system mainly includes a fiber pre-forming module, a vacuum heating infiltration module, a hot-press curing molding module, and a data acquisition control module. Under the conditions of natural curing at 0 MPa + 6 h + 25 °C, vacuum heating curing at –0.05 MPa + 30 min + 80 °C, and hot-press curing at 0.7 MPa + 5 min + 50 °C, a two-dimensional (2D) CFRP with excellent microstructure and properties was successfully prepared. Observing the microstructure of the prepared composite material, it can be found that the inside of the composite material was sufficiently and uniformly infiltrated, and common preparation defects such as holes and delamination were effectively controlled. Through the performance test, the bending strength of the material reached 790 MPa.