High-expansion-rate liquid expanding agent and preparation method thereof

Abstract

The invention discloses a high-expansion-rate liquid expanding agent and a preparation method thereof. The preparation method comprises the following steps: 1, weighing a grease-modified expanding component, butanol, dimethyl silicone oil, span 80 and water, and perforing stirring at a constant temperature of 40-50 DEG C for 0.5-1 h; 2, heating the obtained mixture to 70-80 DEG C, sequentially adding polypropylene glycol 400 and a shrinkage reducing component, and continuously performing stirring for 1-2 h; and 3, adding cationic polyacrylamide, performing stirring for 2 h, curing the obtainedmixture at constant temperature for 1 h, and cooling the cured mixture to room temperature to obtain the high-expansion-rate liquid expanding agent. The liquid expanding agent is mainly used for high-grade concrete and concrete with a shrinkage compensation requirement; and the expansion component is obtained by compounding calcium sulphoaluminate clinker, anhydrous aluminum sulfate and anhydrousgypsum, so that the hydration rate of the expansion component is effectively controlled, the volume expansion of the concrete can be remarkably improved, the volume shrinkage of the concrete is reduced, and the crack resistance and impermeability of the concrete are improved.

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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