Modified repair mortar

Abstract

The invention discloses modified repair mortar. The modified repair mortar is prepared by mixing sulphoaluminate cement, ordinary silicate cement, quartz sand, a complex early strength agent, a water-retaining agent, anti-crack fibers, a water reducing agent and water. According to the modified repair mortar, a sulphoaluminate cement and ordinary silicate cement mixed cementing material is adopted, the optimal mix and match proportion is selected, the early strength of the mortar is high, the setting time is proper, and construction is convenient. In addition, the complex early strength agent, the water-retaining agent, the water reducing agent and the like are added, and therefore better strength of the mortar in early stage and later stage is effectively guaranteed. The anti-crack fibers are added in the components, shrinkage deformation of the mortar is greatly reduced, when the mortar is under stress, the anti-crack fibers play an active prevention role in generation and development of cracks, the shrinkage deformation is obviously reduced, and cracks generated in the repair mortar setting and hardening processes and under stress are reduced.

Description

technical field [0001] The invention relates to a construction mortar, in particular to a modified repair mortar. Background technique [0002] At present, domestic research on repair materials is mainly concentrated on traditional epoxy resin mortar or resin concrete, and this kind of composite material has high requirements on material compatibility, complicated preparation, high cost, aging, Destruction phenomena such as cracking make the performance of repair materials drop significantly. At the same time, most Portland cement-based repair materials cannot meet the requirements of rapid setting hardening and early strength. Although the sulphoaluminate cement used in some emergency projects has the advantages of fast setting time and high early strength, it also has disadvantages such as later strength shrinkage and too fast setting time, which is not convenient for construction. Contents of the invention [0003] The object of the present invention is to provide a mo...

AI Technical Summary

Problems solved by technology

[0002] At present, domestic research on repair materials is mainly concentrated on traditional epoxy resin mortar or resin concrete, and this kind of composite material has high requirements on material compatibility, complicated preparation, high cost, aging, Destruction phenomena such as cracking make the performance of repair materials drop significantly. At the same time, most Portland cement-based repair materials cannot meet the requirements of rapid setting hardening and early strength.

Although the sulphoaluminate cement used in some emergency projects has the advantages of fast setting time and high early strength, it also has disadvantages such as later strength shrinkage, too fast setting time and inconvenient construction.