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.
Fresh and hardened properties of Polypropylene fiber added Self-Consolidating Concrete
Self-Consolidating Concrete (SCC) is a special concrete which is highly flowable, non- segregating and by its own weight spread into place, completely fill the formwork even in the presence of dense reinforcement and then encapsulate the rebar without the need of any additional compaction. Similar with other cement-based materials, SCC also has a brittle characteristic. This research conducted to evaluate the effects of polypropylene fiber addition on fresh state characteristics of SCC mixes, and investigate the effects of polypropylene fiber on some hardened properties of SCC. In this research, concrete mixes were added with polypropylene fiber of 0%, 0.05%, 0.10%, and 0.15% volume fraction. Fresh characteristics were evaluated based on its passing ability, flowability, viscosity, and segregation resistance using J-ring, Slump flow, and Sieve Segregation Resistance tests. After 28 days of curing, compressive, splitting tensile strength, and drop-weight impact resistance were tested. Tests results indicate that polypropylene fibers tend to reduce the flowability and passing ability but will increase viscosity and segregation resistance of SCC. Furthermore, it can be concluded that polypropylene fiber reduce deformability of SCC in the fresh state. After 28 days of curing, concrete specimens' tests indicate that polypropylene fiber addition up to 0.10% of volume fraction tend to improve the compressive strength, tensile strength, and impact resistance of hardened SCC. It also can be suggested that polypropylene fibers allowed to be added into SCC mixes up to 0.10% by volume of concrete.
Rheological and Mechanical Characterization of Fiber-Reinforced Self-Compacting Concrete
151 Abstract— The past decades have seen a remarkable evolution in the performance of concretes, in terms of both their rheological behavior and their mechanical behavior. These advances are the result of linking principles of formulations that have to meet the specifications that often go beyond the usual obligations of result in terms of fluidity regarding the implementation and strength of hardened concrete. The first step is the synthesis of the formulation principles of various published research works and adaptation of these principles to the conditions of production (considering the characteristics of the materials used). The second step is the verification and validation through study tests (slump flow, sieve stability, L-box and V-Funnel) and by mechanical tests (Compressive and Flexural strength, Elastic modulus and Poisson’s ratio). The third step shows that the formulation of fiber concrete, meet the requirements to be classified as self-compacting concrete, compromising between a sufficient fluidity to ensure a proper implementation and a sufficient consistency to avoid any problems of segregation and bleeding. The purpose of this article is to improve the mechanical properties of the self-compacting concrete by the adding of metallic and synthetic fibers without altering its rheological performance fixed by the standards.