Fiber Reinforced Concrete - University of California, Berkeley纤维增强混凝土-加利福尼亚大学，伯克利.pdfVIP

Fiber Reinforced Concrete Fibers in Concrete Old Concept Exodus 5:6, And Pharaoh commanded the same day the taskmasters of the people, and their officers, saying, Ye shall no more give the people straw to make brick, as heretofore: let them go and gather straw for themselves Egyptians used straw to reinforce mud bricks, but there is evidence that asbestos fiber was used to reinforce clay posts about 5000 years ago. P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Fibers in Concrete Growth Industry Even though the market for fiber reinforced concrete is still small compared to the overall production of concrete, in North America there has been an yearly growth rate of 20% and that the worldwide yearly consumption of fibers used in concrete is 300,000 tons. P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Fibers in Concrete Classification according to volume fraction Low volume fraction (1%) Moderate volume fraction (between 1 and 2%) High volume fraction (greater than 2) P.K. Mehta and P.J.M. Monteiro, Concrete: Microstructure, Properties, and Materials Fibers in Concrete Low volume fraction The fibers are used to reduce shrinkage cracking. These fibers are used in slabs and pavements that have large exposed surface leading to high shrinkage crack. Disperse fibers offer various advantages of steel bars and wiremesh to reduce shrinkage cracks: – (a) the fibers are uniformly distributed in three-dimensions making an efficient load distribution;