Strengthening treatment method of recycled aggregate, low self-shrinkage mortar using recycled aggregate and preparation method thereof

Abstract

The invention discloses a strengthening treatment method of recycled aggregates, a low self-shrinkage mortar using recycled aggregates and a preparation method thereof, belonging to the technical field of building materials. 60-150 parts, 5-20 parts of polycarboxylate water reducer, 800-2000 parts of aggregate, 10-15 parts of polypropylene fiber, and 120-320 parts of mixing water. The aggregate is obtained according to the following steps: first soak the recycled aggregate with dilute sulfuric acid, take out the aggregate after 5-10 minutes, wash and sieve it, soak it again with dilute acetic acid for 12-36 hours, take it out and dry it, and then vibrate and sieve, and screen out 0.15 Aggregates in the ~4.75mm particle size range were used as fine aggregates for the preparation of mortar. The mixing water is the dilute acetic acid soaking waste liquid after the aggregate is taken out during the soaking treatment process with dilute acetic acid. The invention optimizes the physical properties of the regenerated aggregate and improves the availability of the regenerated aggregate by strengthening the regenerated aggregate; Minimizes the risk of damage to the mortar due to cracking.

Description

technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a strengthening treatment method of recycled aggregates, a low self-shrinkage mortar using recycled aggregates and a preparation method thereof. Background technique [0002] In the process of accelerating urbanization, a large number of old buildings have been demolished, resulting in a large amount of construction waste. In many building demolition waste, the proportion of concrete is as high as nearly 50%. The production of a large amount of construction waste not only brings great harm to the environment, but also brings new challenges to our research. [0003] After the construction waste is sorted, crushed and screened, it is used as recycled aggregate to replace natural sand and stone in concrete, which is the main way of its application. However, due to the special properties of the recycled aggregate itself, physical and chemical methods are usual...

AI Technical Summary

Problems solved by technology

[0007] However, the traditional cement mortar will shrink greatly after hardening. It is difficult to fill and compact when used for grouting. It is prone to cracking and falling off when used for plastering, resulting in poor wall decoration effect. There are gaps between the material and the structure again, affecting the repair effect