A kind of organically modified cement-based repair mortar

Abstract

The invention discloses organic modified cement based patch mortar. The organic modified cement based patch mortar is prepared from the following raw materials in parts by mass: 100-200 parts of rapid-hardened sulfo-aluminate cement, 20-50 parts of silicate cement, 20-50 parts of limestone flour, 5-30 parts of ultrafine mineral powder, 150-400 parts of nano attapulgite, 2-5 parts of expansion agent, 70-150 parts of cationic emulsified asphalt, 0.06-0.1 part of antifoamer, 0.6-2 parts of water reducing agent, 200-600 parts of sand and 100-150 parts of water. The patch mortar disclosed by the invention is high in mechanical properties, good in impermeability and low in whole mortar shrinkage and has good compatibility with a cement matrix, the raw materials are cheap and readily-available, and the cost is relatively low, so that the patch mortar is suitable for being popularized in large scale.

Description

technical field [0001] The invention relates to the field of new building materials, in particular to an organically modified cement-based repair mortar. Background technique [0002] With the rapid development of the national economy, people's demand for buildings is also constantly developing. Many existing buildings can no longer meet the requirements of modern life, whether in terms of appearance or function, and are in urgent need of reinforcement and renovation. During the long-term use of cement-based buildings, they are affected by factors such as heavy loads, freeze-thaw cycles, penetration of chloride ions, surface abrasion, and erosion of corrosive media. Many buildings have cracked, peeled, and hollowed out. , which greatly affects the service life of the project. [0003] At present, there are two types of repair materials in the market: inorganic and organic. Cement-based repair mortar is the most commonly used material for concrete structure repair or reinfor...

AI Technical Summary

Problems solved by technology

However, when traditional cement materials are used, they have inherent defects such as low tensile strength, low toughness, large shrinkage, and poor chemical corrosion resistance, which affect the performance of cement-based materials.

The existing polymer-based repair materials have poor compatibility with cement substrates and high cost. In the actual construction process, there are still poor construction effects, low bonding strength, long setting time, poor durability, and easy to fall off. Practicality Poor, thus limiting the production and application of cement-based repair mortar