High-performance reinforced mortar suitable for thick-layer spraying and preparation method thereof

Abstract

The invention discloses a high-performance reinforced mortar suitable for thick-layer spraying and a preparation method thereof. The high-performance reinforced mortar is mainly prepared from ordinary portland cement, silica fume, coal ash, an expanding agent, a water reducing agent, cellulose ether, anti-crack fibers, and graded sand in a certain mass percent, wherein the mass percent of each composition is as follows: the cement 24%-32%, the silica fume 4%-8%, the coal ash 4%-8%, the expanding agent 2.0%-3.5%, the water reducing agent 0.1%-0.15%, the cellulose ether 0.05%-0.2%, the anti-crack fibers 0.05%-0.1%, and the graded sand 56%-66%. The high-performance reinforced mortar of the invention has strength of M60-M80, and can be used to meet reinforcing requirements of high strength concrete of strength grade C60. The high-performance reinforced mortar has good pumping performance, and is suitable for mechanized spraying construction. Moreover, the high-performance reinforced mortar has excellent substituted performance and a single spraying construction thickness of 40mm, and can be used to meet construction requirements of large-size members and thick-layer reinforcement.

Description

technical field [0001] The invention belongs to the field of high-strength concrete structure reinforcement building materials, and in particular relates to a high-performance reinforcement mortar suitable for thick-layer spraying and a configuration method thereof. Background technique [0002] With the rapid development of the national economy, high-strength concrete above C60 has been used more and more in industrial plants, high-rise buildings, municipal highways and bridges and other fields. Correspondingly, structural damage problems caused by poor construction quality, improper maintenance, and adverse environmental factors also follow. Therefore, the method of structural reinforcement is used to restore the bearing capacity and safety of high-strength concrete structures. One of the important development directions in the reinforcement field. [0003] Due to the high labor cost in European and American countries, the mechanized spraying construction of mortar was po...

AI Technical Summary

Problems solved by technology

In the reinforcement of high-strength concrete structures above C60, the current mainstream high-strength reinforcement mortar in the market has the problem of poor mechanized spraying workability due to unreasonable configuration methods or the inability to carry out thick-layer spraying due to poor hanging ability of the mortar.

What's more serious is that the excessively high cement content leads to frequent cracking of the mortar surface layer, and aggravates the corrosion of the steel bars inside the mortar, which deteriorates the reinforcement mortar and seriously affects the effectiveness of reinforcement.

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