High-performance mineral additive for concrete

Abstract

The invention relates to a high-performance mineral additive for concrete, which is characterized in that: raw materials consist of 70 percent of ultrafine slag, 25 percent of flyash and 5 percent ofplaster; the ultrafine slag is prepared by grinding slag, accords with the S75 grade, and has the specific surface area (percent) more than or equal to 360m<2>/kg, the chemical performance that MgO (percent) is less than or equal to 15 and SO3 (percent) is less than or equal to 5, and the time of setting glue that the initial setting is +100min and the final setting is +100min; and the flyash is III class and the plaster is II class, and the high-performance mineral additive is prepared by physical mixing. The high-performance mineral additive can be widely applied to the fields such as buildings, building materials, traffic, water conservancy and the like, is suitable for large-volume concrete, projects such as foundation, road surfaces, seabed, tunnels, bridges and the like, high rise buildings, foundation road surfaces, seabed projects and concrete with special requirements, has obvious strengthening effect, shortens autoclave cycle, greatly improves initial and later strength of cement, can meet the requirements of high-performance cement products, and has the characteristics of saving energy, reducing cost, protecting environment, utilizing waste and the like.

Description

Technical field [0001] The invention belongs to the technical field of building materials and relates to a high-performance mineral additive for concrete. Background technique [0002] At present, the concrete used in building construction is made by mixing cement and sand, which affects the construction quality due to problems such as workability and poor construction performance. In order to improve the workability of building concrete, the traditional solution is to add lime paste. This method has an adverse effect on the water resistance and crack resistance of concrete. At present, chemical cellulose materials and mortar microfoaming agents are used as additives in the construction industry. Simply adding chemical cellulose materials in use will increase the water / cement ratio in concrete and reduce the strength of concrete; while simply adding mortar microfoaming agents It will also cause air bubbles in the concrete and reduce the strength of the concrete. Summary of the ...

AI Technical Summary

Problems solved by technology

[0002] At present, the concrete used in building construction is made of cement and sand, which affects the construction quality due to problems such as workability and poor construction performance.

In order to improve the workability of building concrete, the traditional solution is to add lime paste, which has a negative impact on the water resistance and crack resistance of concrete.

At present, chemical cellulose materials and mortar microfoam are used as additives in the construction industry. Simply adding chemical cellulose materials in use will increase the water / cement ratio in concrete and reduce the strength of concrete; while simply adding mortar microfoam It will also cause air bubbles in the concrete and reduce the strength of the concrete.