Research On The Basic Mechanical Properties Of Fiber Reinforced Reactive Powder Concrete

Based on the analysis of the development of Reactive Powder Concrete (RPC) and fiber concrete all over the world. According to the actual conditions, the author selected the raw materials of fuzhou, and carried it on the experimental study of the basic mechanical properties of fiber Reactive Powder Concrete (fiber RPC ).The author did the mechanical properties experiments of 46 groups of cubes( 70.7mm) 68 groups of cubes( 100mm) 28 groups of prism specimens (100mm×l00mm×300mm)and 56 groups of specimens (40mm 40mm× 160mm) of small beam .The author also studied how the factors which included the type of the fiber(steel fiber , polypropylene fiber ) volume fractions of fiber curing systems(standard curing hot water curing steam curing )impacted the mechanical properties of fiber RPC .The author studied the basic mechanics properties of steel fiber RPC and polypropylene fiber RPC (cubic strength, splitting tensile strength, deformation module, peak strain, Poisson's ration etc.); and analyzed the effect of size on fiber RPC compression strength and splitting tensile strength .The author set up the stress-strain curve ascending for steel fiber RPC and polypropylene fiber of RPC-meet an emergency curve rise an equation; and described small beam loads one that tests the load-deflection curve, and analyzed the destruction mechanism of fiber RPC and the fiber enhancement mechanism to RPC. So the author draws a preliminary conclusion as follow:1. Steel fibers and polypropylene fibers have no obvious effect on improving the compression strength of RPC . But they have great effect on splitting tensile strength and bending strength.2. With the increase of the steel fiber and polypropylene fiber, themechanical properties of fiber RPC shows certain regularity, and this is correlated with curing system.3. An impact on fiber RPC mechanical properties relates to the fact that maintain the system age .The general standard curing the development ability of the strength is greater than hot water curing and steam curing later stage; The steam is maintained , plain RPC and fibre RPC have phenomenon that strength contract with the increase of age ; Among them the hot water is maintained to improving the fibre RPC mechanical properties result best.4. Plain RPC presents the obvious fragility while being destroyed , after adding the steel fibre, the fragility gets obvious improvement, the ductility and toughness gets obvious improvement. The improvement on RPC fragility of polypropylene fiber is smaller.5. The simplified formula about several main basic mechanical properties have been proposed for fiber RPC.The result of theories and that of experiments fit well.It can be provided as further related further research reference.