Surface treatment process of lightweight aggregate used for concrete

Abstract

The invention discloses a surface treatment process of lightweight aggregate used for concrete, and aims at solving the problem of floating up of the lightweight aggregate; the main technical measures of the process comprise the following steps: (1) adding binding materials into an agitator, then adding tap water, which accounts for 20% to 30% of total amount of the binding materials, stirring slowly for 30 seconds, and quickly stirring for one to two minutes; (2) taking out the lightweight aggregate which is soaked with water and putting into the agitator, and slowly stirring for 2 to 5 minutes; (3) taking out the lightweight aggregate which is subjected to stir, and carrying out natural or standard curing. According to the process provided by the invention, not only is the floating up phenomenon of the lightweight aggregate eliminated, and the uniformity of concrete mixtures improved, but also the breakage rate and the water absorption of the lightweight aggregate are reduced during use, and the binding power among the lightweight aggregate, a wrapper and concrete interlamination is strengthened under the premise of not influencing the use function, and the improvement of the whole performance of lightweight aggregate concrete is facilitated.

Description

technical field [0001] The invention belongs to the technical field of lightweight aggregate concrete in building materials, and mainly relates to a surface treatment process for lightweight aggregate used in concrete. Background technique [0002] Lightweight aggregate concrete is made of light coarse aggregate, light fine aggregate (or ordinary sand), cementitious material and water, and its dry apparent density is not more than 1950kg / m 3 Concrete has the characteristics of light weight, high strength, thermal insulation, heat insulation, and earthquake resistance. It is widely used in load-bearing and non-load-bearing structures, such as bridge engineering, high-rise buildings, and thermal insulation structures. [0003] The smaller the apparent density of lightweight aggregate, the better the thermal insulation and earthquake resistance of concrete, but the apparent density of lightweight aggregate is usually lower than that of water, and it is easy to float to the sur...

AI Technical Summary

Problems solved by technology

The silica fume slurry encapsulation method uses silica fume and polycarboxylate superplasticizer to form a slurry to cover the surface of the ceramsite to suppress floating. The purpose of introducing silica fume is to hope that the Ca(OH) 2 After the reaction, a stable coating layer is formed, but this reaction does not occur until 2-3 days after the concrete is formed, so the stability of the coating layer is still poor during stirring, and there are the same problems as the cement slurry coating method, and the price of silica fume is relatively high. high

As for the hydrophobic treatment on the surface of lightweight aggregate, water reducing agent is added to form a hydrophobic layer on its surface to reduce water absorption, but it cannot eliminate floating, and at the same time reduces the binding force between lightweight aggregate and cement paste

Images