A kind of lightweight building block and preparation method thereof

Abstract

A lightweight building block includes aggregate and binder, and the binder includes regenerated fine powder of waste concrete. The recycled micropowder of waste concrete is obtained after the waste concrete is sieved to remove coarse aggregate and fine aggregate, and the remaining waste particles and powder are ground to obtain particles with a particle size between 0.03 mm and 0.1 mm. Its preparation method is to mix waste concrete regenerated micropowder, alkaline calcium ion chelating agent, soda lime glass suspension dispersion, modified glass pumice, and silica-alumina mineral reinforcing agent in a certain proportion, stir and form, and seal at 60- It is formed after condensation and hardening in an oven at 90°C to improve the strength of the block. The invention realizes the utilization of waste concrete regenerated micropowder, makes the waste concrete micropowder treated as a beneficial masonry admixture, and under the premise of not needing to mix cement, a high proportion of mixed regenerated micropowder can be combined with other components The formation of higher-strength gels not only reduces the use of cement, but also solves the environmental problems caused by waste concrete powder.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to the recycling of waste concrete, in particular to a method for recycling waste concrete regenerated micropowder. Background technique [0002] With the continuous increase of the scale of urban reconstruction and expansion in my country and the continuous renewal of old urban buildings, the demolition of a large number of old buildings and structures has produced a large amount of waste concrete. At present, construction waste concrete is mainly disposed of in traditional ways such as open-air stacking and landfilling, which not only takes up a lot of land, but also causes great harm to the environment and personal safety. In recent years, my country has begun to accelerate the recycling of waste concrete, but it mainly focuses on the utilization of coarse and fine aggregates. In the process of forming recycled aggregates, a large amount of recycled fine powder will inevitably app...

AI Technical Summary

Problems solved by technology

At present, the use of recycled micropowder is less, and from the research on recycled micropowder, it is found that in the prior art, recycled micropowder is mainly used as an inert admixture or filler, and some studies use it to replace part of cement to produce concrete , but the main use is the unhydrated cement particles. In fact, the highest proportion of unhydrated cement particles in the recycled aggregate powder of waste concrete does not exceed 16%, and there are a large amount of hydrated calcium silicate and calcium hydroxide in the rest. , and due to the large water absorption of the recycled micropowder, the strength of the equal-proportion replacement cement will decrease, and the formed concrete will also crack

Therefore, the current technical means have not fully exploited the practical value of recycled micro-powder as a cementitious material, nor have they completely solved the problem of waste concrete recycled micro-powder as a cement substitute admixture

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