Multi-strength regeneration brick aggregate fiber concrete and preparing method thereof

Abstract

The invention relates to multi-strength regeneration brick aggregate fiber concrete and a preparing method thereof. The multi-strength regeneration brick aggregate fiber concrete is prepared from cement, fine aggregate, natural coarse aggregate, regeneration brick coarse aggregate, polyolefin fiber, steel fiber and water according to the weight ratio of 1: (0.780-1.309) : (0-1.830) : (0.390-1.568) : (0-0.019) : (0-0.161) : (0.33-0.48). The regeneration brick aggregate fiber concrete with the target strength grade of CF30-CF50 can be prepared by means of the raw materials, strength grade is high, and application range is wide. The obtained regeneration brick aggregate fiber concrete has high working performance including peaceability and water-retaining property, compressive strength and splitting-tension strength are high, the preparing process is simple and environmentally friendly, and construction is easy.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to multi-strength recycled brick aggregate fiber concrete and a preparation method thereof. Background technique [0002] With the continuous acceleration of my country's urbanization process and the continuous deepening of new rural construction, a large number of houses in urban and rural areas have been demolished, and the resulting waste of broken bricks and tiles has increased unprecedentedly. At present, the total amount of construction waste piled up in my country has reached 70×10 9 t, the construction solid waste generated by the annual demolition of buildings in 2×10 9 More than t, most of them are transported to the outskirts for open-air stacking or landfill without any treatment, consuming a lot of cultivated land resources. At the same time, problems such as scattering and dust in the process of clearing, transporting and stacking have aggravat...

AI Technical Summary

Problems solved by technology

[0003] There are the following major defects in the existing concrete preparation with waste fired bricks: (1) Due to the low density of waste fired brick aggregates, there is a phenomenon of floating during the vibration process, and the distribution of aggregates is not uniform enough, resulting in relatively low strength of the prepared concrete. CF10~CF20; (2) Since the crushing index of waste brick aggregate is lower than that of natural aggregate, low substitution rate is generally used in the use process to make up for its poor mechanical properties, which reduces the utilization rate of recycled brick aggregate and affects the Recycling, rationalization and green use of waste sintered bricks; (3) The water absorption rate of waste brick aggregates is generally large, and the recycled aggregate concrete prepared with waste brick aggregates has large shrinkage, crack resistance, and poor crack resistance, etc. Disadvantage, it is difficult to use for pouring of building components

[0004] At present, although there are some research results of recycled brick aggregate concrete, its basic mechanical properties are poor, and there are generally disadvantages such as low strength, easy cracking, large shrinkage, and uneven distribution of aggregates.

At the same time, the relevant performance of recycled brick aggregate concrete cannot be adjusted according to the use environment and requirements of the building, and the mix ratio is poorly targeted.

It is not conducive to the resource utilization of recycled brick aggregates and the large-scale application of fiber recycled brick aggregate concrete