Processing method for building waste foamed concrete composite heat preservation building blocks

Abstract

The invention discloses a processing method for building waste foamed concrete composite heat preservation building blocks. The invention provides a processing method for the building waste foamed concrete composite heat preservation building blocks. By virtue of the processing method, the performance of a recycled material can be optimized to the maximum extent, so that the compression strength, the shear strength and the heat preservation performance of a finished product can be guaranteed. Each building block comprises a base body and a heat preservation core body. A building block preparation process comprises base body forming, core body preparation, maintaining and drying working procedures; each base body comprises cement, an active mixed material, a modifier and a recycled aggregate. A processing method for the recycled aggregate comprises the steps of (1) classifying and initially sorting building waste; (2) roughly crushing building waste to prepare granular recycled coarse aggregates of which the dimension is smaller than 10mm; (3) performing mechanical enhancement on the recycled coarse aggregates, adding natural sand into the recycled coarse aggregates according to a weight ratio of 1:(0.2 to 1), and taking fine sand, which has the particle size of 0.25-0.5 mm, in the mechanically enhanced aggregates for later use. According to the method, the building blocks are high in bonding strength and uniform, the water absorption property of a single unit is reduced, the production cost is lowered, and the production technology is simple and feasible.

Description

Technical field [0001] The invention relates to a method for manufacturing building materials by using construction waste, in particular to a method for preparing foamed concrete blocks from construction waste, and belongs to the technical field of environmental protection and building wall insulation materials. Background technique [0002] my country is in a period of rapid economic development, and hundreds of millions of tons of solid construction waste materials are generated every year, most of which are untreated, basically piled up or buried in the open air, causing waste of resources and environmental pollution. Construction waste (waste concrete construction waste and brick-concrete construction waste) accounts for the largest proportion of all types of construction waste, and is currently the main object of construction waste resource disposal and utilization. At present, waste concrete construction waste and brick-concrete construction waste are mainly processed into ...

AI Technical Summary

Problems solved by technology

However, it may not be obvious to use this technology to prepare solid bricks, but there are the following problems in the production of environmentally friendly insulation bricks: the recycled aggregate produced by this technology cannot meet the needs of the foaming process, and the insulation blocks prepared by it The strength is far below the national standard

After analysis, we found that the main reason is that the overall uniformity of the recycled aggregate is not enough, and the surface of the aggregate body (monomer) has not been effectively strengthened (passivated) in essence (mainly the friction between the monomer and the monomer, and the The proportion of the monomer that can be contacted by the metal cylinder wall and the blade is very small), and finally the aggregate body produced by this process will have stress concentration when building the microstructure of the foamed brick body (such as Figure 9 As shown, that is, when the sharp edges and corners of the aggregate monomer face the air bubbles 7 and the distance is relatively close, it is easy to form stress concentration and form cracks 8)

In addition, since the surface has not been passivated substantially, the water absorption rate of the monomer is also high, which will also affect the performance of the finished product

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