A kind of high expansion ratio liquid expansion agent and preparation method thereof

Abstract

The invention discloses a liquid expansion agent with a high expansion rate and a preparation method thereof. The expansion agent is prepared by the following steps: Step 1: weighing the expansion component modified by oil, butanol, simethicone oil, and Span 80 and water were stirred at a constant temperature of 40-50°C for 0.5-1h; Step 2: Raise the temperature to 70-80°C, add polypropylene alcohol 400 and shrinkage reducing components in turn, and continue stirring for 1-2h; Step 3: Add cationic poly Acrylamide, stirred for 2 hours, matured at constant temperature for 1 hour, and then cooled to room temperature to obtain a high-expansion liquid expansion agent. The liquid expansion agent of the present invention is mainly used for high-grade concrete and concrete that needs to compensate for shrinkage. The expansion component is composed of calcium sulfoaluminate clinker, anhydrous aluminum sulfate and anhydrous gypsum, and the hydration rate of the expansion component can be effectively controlled. Significantly increase the volume expansion of concrete, reduce the volume shrinkage of concrete, and improve the anti-crack and impermeability of concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to an expansion agent, in particular to a liquid expansion agent with a high expansion rate and a preparation method thereof. Background technique [0002] Expansion agent is a chemical admixture that is added to cement. When the cement sets and hardens, its volume expands to compensate for shrinkage and prestressing of steel bars and to fill cement gaps. The expansion agent is used in underground buildings: Such as subways, underground parking lots, underground warehouses, tunnels, mines, civil air defense projects, foundation pits, mixing stations, etc.; pools, swimming pools, water towers, storage tanks, large containers, granaries, oil tanks, warehouses in caves and other construction applications extremely broad. Concrete expansion agent is used to prepare expansive concrete, that is, shrinkage-compensated concrete and self-stressed concrete. Shrinkage-compensated con...

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Problems solved by technology

[0003] At present, the expansion agents used in the market are basically in powder form, and the dosage is generally around 8.0%. When used, manual measurement and addition are often required. When the production volume of concrete is large, it is not conducive to production and popularization. The overall performance of the concrete expansion agent is poor, such as expansion, setting time and flexural compressive strength and other properties

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