Investigation on Mixing Process for the Development of High Ductile Mortar Containing Thin and Short Fibers

摘要

With a target of developing the High Ductile Mortar, the author has focused to develop the new mixing method for thin and short synthetic fibers reinforced mortar, namely High Ductile Mortar (HDM) mixing method. The HDM mixing method was developed with the original concept of the author that the thin and short synthetic fibers are able to be uniformly distributed and firmly coated while mixing in a viscous mortar. Viscous mortar was prepared by mixing the mortar with the addition of the first part of the water. Then, the required workability of HDM can be increased with further mixing with the addition of the second part of water without any disturbance on the distribution and coating condition of the fibers. The HDM mixing method was proved to be better than the conventional mixing method to increase the flexural strength and ductility of the fiber mortar containing thin and short Poly-Vinyl Alcohol (PVA) fibers. Flexural strength was increased by about 35% (from 7.5 MPa to 10.5 MPa) and the deflection at the peak level of flexural strength was increased by about 67% (from 0.75mm to 1.25mm). HDM mixing method prevailed good result to develop the High Ductile Mortar (HDM) of high flexural strength with significant enhancement in its ductility behavior.