Quick-hardening cementing material as well as preparation method and application thereof

Abstract

The invention relates to a quick-hardening cementing material and a preparation method and application thereof. The quick-hardening cementing material comprises the following raw materials in parts by mass: 50-100 parts of Portland cement; 10 to 30 parts of fly ash; 3 to 10 parts of silica fume; 5 to 20 parts of sulphoaluminate cement; 0.5 to 2 parts of an accelerator; 0.5 to 3 parts of an inorganic early strength agent; 0.05 to 0.1 part of an alcohol amine early strength agent; 0.5 to 2 parts of calcium formate; and 0.3-2 parts of a water reducing agent. The Portland cement and the sulphoaluminate cement basically do not contain gypsum. In order to control the setting rate within a proper range, the Portland cement without gypsum and the sulphoaluminate cement are matched, and the accelerator, the inorganic-organic early strength agent and the calcium formate are matched, so that the initial setting time can be shortened and relatively high strength can be achieved as soon as possible under the condition that the later strength is not influenced.

Description

technical field [0001] The present application relates to a fast-hardening gel material and its preparation method and application. Background technique [0002] Concrete is currently the most widely used and used building material in the world. It plays an irreplaceable role in the fields of construction engineering, highway engineering, tunnel engineering, water conservancy engineering and special structure construction. Concrete structures are mainly used to bear loads or resist various external forces. However, due to factors such as design, construction, external environment and its own durability, the concrete engineering is damaged, which affects its normal service life. Due to the fast setting and hardening, the rapid repair material has high early strength and short construction period. After the structure is repaired, it will resume application soon. Due to the fast setting and hardening of special cement and high early strength, special cement (sulfoaluminate c...

AI Technical Summary

Problems solved by technology

Due to the fast setting and hardening of special cement and high early strength, special cement (sulfoaluminate cement, high alumina cement, magnesium phosphate cement, etc.) , low bond strength, easy to crack, less use of repair mortar; but special cement has the disadvantages of poor volume stability, long-term use strength shrinkage, high price; some organic repair mortar polymers such as epoxy resin, acrylic acid , polyester resin and other resins are used as the main raw materials, and a certain amount of fillers, curing agents, plasticizers, etc. are added to modify the repair material. The early calorific value of the resin material is large, the hardened slurry is brittle, and the shrinkage is relatively large. Additives such as diluents and curing agents may also cause environmental pollution due to their toxicity. At the same time, organic materials are prone to aging under the influence of the environment, which reduces the durability and limits their large-scale application in repair projects.

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