Activator of large doped quantities of levigated slag concrete

Abstract

This invention discloses an activator used in large-doping-amount finely ground slag concrete. The activator is composed of: gypsum 60-81 wt.%, naphthalin high-performance water reducer 7-10 wt.%, hydroxyl compound 0-0.02 wt.%, surfactant 0-0.002 wt.%, and finely ground slag 9-30 wt.%. The activator can replace 4-6% of cement in large-doping-amount finely ground slag. The concrete added with the activator has such advantages as high mixability, high pumpability, and high volume stability. With the activator, the doping amount of finely ground slag in the concrete can be increased to 70%.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a novel low-mixing and high-efficiency large-volume ground slag concrete activator for preparing high-performance concrete by using a large-volume slag. Background technique [0002] High-performance concrete is a new type of high-tech concrete. It is made of modern concrete technology on the basis of greatly improving the performance of ordinary concrete. It takes durability as the main index of design. Concrete that guarantees performance, applicability, strength, volume stability and economy is the development direction of concrete in the future. There are many ways to mix high-performance concrete, and one of the ways to improve the performance of concrete is to add appropriate amount of ground slag or to mix other active admixtures mainly with ground slag. Applying finely ground slag to concrete can greatly reduce the amount of cement, change the microstructure of ...

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Problems solved by technology

At present, the large-volume ground slag concrete technology has been applied in my country's seaport projects and water conservancy projects, but due to its poor workability and pumpability, large self-shrinkage and other problems, it is rarely used in industrial and civil construction. In industrial and civil construction, the maximum amount of slag mixed is often not more than 40%

[0004] The performance characteristics of concrete prepared with large-volume slag are mentioned in domestic and foreign literature, but when a large-volume ground slag is used to replace the cementitious material in the preparation of concrete, a large-volume ground slag concrete activator is added to improve the volume stability of the concrete itself property and strength, meet the workability and pumpability of concrete, and have not been reported yet

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