Method for preparing hybrid fiber modified light water-permeable and durable recycled concrete

Abstract

The invention discloses a method for preparing hybrid fiber modified light water-permeable and durable recycled concrete. First a mineral miscellaneous material, a cementing material and a modified regenerated coarse aggregate are evenly mixed, water is poured for stirring to obtain cement paste, a ternary hybrid fiber and water are evenly mixed and then poured into the cement paste for stirring,and an efficient naphthalene water reducer is added; after uniform mixing, foams well made by a foaming device are added, and full and uniform mixing is performed to obtain concrete slurry; the well prepared concrete slurry is poured into a die and lightly and evenly vibrated, the surface of a poured sample is covered with a preservative film, demolding is performed after standing, and curing is performed. A glass fiber, a polypropylene fiber and a steel fiber are mixed into the ternary hybrid fiber, the recycled concrete is modified, the compressive strength can be obviously improved, the steel fiber in the hybrid fiber belongs to high elastic modulus fibers, so that the elasticity modulus of the recycled concrete after the doping of the hybrid fiber is increased, and the doping of the hybrid fiber can obviously improve the vibration resistance of the recycled concrete and enhance ductility and energy dissipation performance of the recycled concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a preparation method of lightweight, permeable and durable recycled concrete modified by hybrid fibers. Background technique [0002] Since the 21st century, my country has vigorously developed the construction industry, which has produced a huge amount of construction waste. Due to the inappropriate treatment of construction waste, it has greatly endangered the natural environment we rely on for survival; on the other hand, the production of building materials requires a large amount of natural resources. resources, posing a major threat to the ecological environment and natural resources. Recycling, processing and reusing construction waste can not only solve the damage of construction waste to the natural environment, but also alleviate the threat to the ecology caused by sand and gravel mining. Therefore, the effective and reasonable utilization of waste concrete ...

AI Technical Summary

Problems solved by technology

[0002] Since the 21st century, my country has vigorously developed the construction industry, which has produced a huge amount of construction waste. Due to the inappropriate treatment of construction waste, it has greatly endangered the natural environment we rely on for survival; on the other hand, the production of building materials requires a large amount of natural resources. resources, posing a major threat to the ecological environment and natural resources

However, in practical engineering applications, in addition to being subjected to various loads, lightweight concrete is also affected by various natural factors in the environment. Under harsh environmental conditions, it may cause damage or even destruction due to poor durability.

If there is a lack of understanding of the durability of lightweight concrete, hidden dangers will be buried in many projects during construction, and unnecessary economic losses will be caused in the later use. Therefore, it is necessary to conduct a systematic study on the durability of lightweight concrete