Concrete accelerator for subway construction

Abstract

The invention discloses a concrete accelerator for subway construction. The concrete accelerator comprises the following raw materials in parts by weight: 20-40 parts of sodium polyacrylate, 30-50 parts of isopropanol, 20-30 parts of marine microalgae polysaccharide, 20-30 parts of aluminum sulfate and 15-25 parts of acetic acid. The invention further provides a preparation method of the concreteaccelerator for subway construction. The preparation method comprises the following steps: S1, preparing a solid-liquid mixture, S2, dissolving the precipitate with sulfuric acid, S3, preparing a mixture, and S4, heating to dissolve the mixture to obtain an accelerator. The method has the beneficial effects that the concrete is stably and quickly solidified by utilizing platymonas subcordiformis polysaccharide, so that the strength of the quick-setting concrete is improved, superfine grinding, retreatment and chromatography are adopted, so that the purity of the prepared platymonas polysaccharide is guaranteed and preparation is made for subsequent easy degradation, the alum is utilized, so that wide sources of raw materials can be guaranteed, aluminum ions can be fully leached, so that the aluminum ions are prevented from polluting the environment, heating is carried out in a water bath, the temperature change is controlled and the temperature is kept after temperature rise so that anaccelerator liquid without generating toxic substances is obtained.

Description

technical field [0001] The invention relates to the field of concrete quick-setting agents, in particular to a concrete quick-setting agent for iron construction and a preparation method thereof. Background technique [0002] Subway is a form of railway transportation, covering all kinds of underground and above-ground road rights in urban areas, high-density, high-capacity urban rail transit system, that is, the abbreviation of "underground railway" or "underground railway"; subway tracks are generally in Where the geological structure is stable, the tunnel excavation shall be carried out by using the open cut and backfill method and the drilling and excavation method, and at the same time, the open cut method, the foundation pit cover excavation method and the foundation pit cover excavation reverse method shall be used for station construction; The geological structure of holes and tunnels is stable, and concrete is generally used in the construction stage of the subway t...

AI Technical Summary

Problems solved by technology

However, it is unavoidable that the quick-setting agents used in shotcrete are mainly high-alkali products, which are highly corrosive and cause great damage to the skin and eyes of production personnel and construction personnel; and strong alkaline solutions are easy to cause Aluminate produces aggregate phenomenon, which easily leads to uneven setting of concrete

And in the quick-setting agent, there are a lot of chloride ions, which are easy to soak into the steel bar, corrode the steel bar material, and reduce the service life of the building

[0004] Such as the invention, a non-alkali and chlorine-free liquid concrete quick-setting agent and its preparation method and application (application number: CN201110112424.3), which discloses a non-alkali and chlorine-free liquid concrete quick-setting agent and its preparation method and application, The product contains the following components in parts by weight: 34-41 parts of aluminum salt, 0-5 parts of inorganic acid, 2-10 parts of organic alcohol, 0.2-2 parts of alcohol amine, 0.2-2 parts of complexing agent, 49 parts of water -59 parts; although the raw materials that do not contain strong alkali and chloride ions can be utilized, the carcinogenic diethanolamine or triethanolamine is used in its alcohol amine, which will cause safety hazards to the human body in the stage of large-scale use, and there is a certain risk for large-scale use at the same time. Physiologically toxic organic reagents are not easy to degrade; and butynediol is used as a complexing agent, which is prone to deliquescence in the air at 25°C, which in turn affects the hardness and time of quick-setting concrete

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