Special fiber mortar stirrer and its use method

Abstract

The invention provides a special fiber mortar stirrer and its use method. The special fiber mortar stirrer comprises an adjustable-speed positive and negative turn motor, a speed reducer, a material barrel, a helical perforated stirring blade and a blade shaft, wherein the motor, the speed reducer, the material barrel and the blade shaft are vertically connected. The use of the special fiber mortar stirrer comprises a stirrer installing process and a running process. The special fiber mortar stirrer has a simple and reliable structure and a good stability, can well satisfy the uniform distribution stirring of a large doping amount (about 2.0% by volume) of domestic PVA fibers, and realizes the uniform fiber distribution through controlling the rotating speed, the rotating direction and the charging sequence.

Description

technical field [0001] The invention relates to a stirring device for uniformly distributing domestic PVA fibers in a large amount (about 2.0% in volume) and a method for using the same, belonging to the field of construction quality control of high-performance cement-based composite materials. Background technique [0002] A large number of studies have shown that PVA (polyvinyl alcohol) fibers are particularly good at improving the ductility of concrete, and are one of the new generation of high-tech green building materials. HPFRCC (high-performance cement-based composite material) prepared by PVA can significantly improve the integrity, flexibility and continuity of concrete and mortar, thereby improving the crack resistance, impermeability and tensile strength of concrete and mortar materials, as well as low-temperature flexibility , Impact resistance. [0003] However, domestic research mostly uses REC-15 fibers and PVA fibers produced in Japan, which are expensive, w...

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Problems solved by technology

[0003] However, domestic research mostly uses REC-15 fibers and PVA fibers produced in Japan, which are expensive, which restricts their large-scale promotion and use; due to the low price of domestic PVA fibers (the price is only 15% of the price of Japanese fibers at the same dosage) ), can also effectively improve the early cracking of concrete, the toughening effect is remarkable, and can improve the tensile strength and impact resistance of concrete, but the disadvantage is that the above results are all when the fiber volume content is low (generally less than 1 %), when the content of domestic PVA fiber reaches 2% of the matrix volume, the domestic PVA fiber cannot be successfully made into HPFRCC with good dispersion, and strain hardening cannot occur

[0004] Obviously, traditional mixing equipment and construction techniques have been difficult to meet the construction requirements of domestic PVA high-performance cement-based composite materials. Designing new mixing equipment and new construction techniques that increase the dispersion of PVA in concrete is an effective way to promote the use of domestic PVA fibers

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