A method for manufacturing modified expansion vitrified microbead anti-shrinkage compensation concrete

Abstract

A method for manufacturing modified expansion vitrified microbeads anti-shrinkage compensation concrete, comprising the following steps: adding expanded vitrified microbeads to dimethylacetamide solution, slowly raising the temperature to 50‑60°C and stirring, maintaining the temperature while stirring After 10-20 minutes, add dropwise a pH regulator to maintain the pH at 8-9, and continue to stir for 5-10min; then take it out to cool and dry naturally, and dropwise add silica sol and N-methylmorpholine, the silica sol drop rate is 5-10ml / min, and the N-methylmorpholine drop rate is 3-5ml / min, the expansion floating beads of the present invention use silica sol and N-methyl Morpholine can fill the micropores or surface defects formed by microbeads during the expansion process, and form a protective layer in the repaired area to prevent excessive infiltration of slurry into the microbeads and ensure their thermal insulation performance. Under the action of acid catalyst, octyltriethoxysilane ensures that the treated expanded floating beads have better interfacial bonding force in concrete, and are evenly filled with aggregate, ensuring uniform and stable performance of each part of concrete.

Description

technical field [0001] The invention relates to a method for manufacturing modified expanded vitrified microbead anti-shrinkage compensation concrete, which belongs to the field of concrete. Background technique [0002] Lightweight aggregate concrete is a kind of concrete with light weight and high strength, heat preservation and fire resistance, shock absorption and shock resistance and durability. It can be widely used in various industrial and civil buildings, roads, bridges and other projects, and has good technical and economic benefits. . With the development of construction, "high strength and light weight" has become the development trend of concrete. In addition, the porosity and water absorption rate of light aggregates are larger than those of ordinary aggregates. After water absorption, the hydration reaction rate is affected, the slump of the mixture is significantly increased and the workability is deteriorated, and the water absorbed in the light aggregates ...

AI Technical Summary

Problems solved by technology

In addition, the porosity and water absorption of lightweight aggregates are larger than those of ordinary aggregates. After absorbing water, the hydration reaction rate is affected, the slump of the mixture is significantly increased and the workability is deteriorated, and the moisture absorbed inside the lightweight aggregates will be released again. , affect the properties of lightweight aggregate concrete after setting and hardening

In addition, the amount of expansion floating beads is relatively large, and the internal floating beads of lightweight concrete have accounted for a large part. The floating beads are completely in contact with each other. When the concrete shrinks and the floating beads are pressed against each other, they are very easy to break. The cracking of floating beads also reduces the strength of concrete, and the thermal insulation performance cannot be guaranteed

Images