Liquid expansion agent for pumping concrete

Abstract

The present invention relates to a liquid expansion agent for pumping concrete. The liquid expansion agent for pumping concrete comprises: an expansion component, a swelling component, a reduction component, a water retention component, a pumping component, and a functional component; The expansion component is made of anhydrous aluminum sulfate; the swelling component is made of polyvinyl alcohol, the reduction component is made of polyether, the water retention component is made of hydroxypropyl cellulose ether, the pumping component is made of a poly-carboxylic acid salt water reducer, and the functional component is made of sodium gluconate; and the contents of the components in percentage are: 0.10%-0.18% of anhydrous aluminum sulfate, 0.05%-0.10% of polyvinyl alcohol, 0.20%-0.60% of polyether, 0.08%-0.15% of hydroxypropyl cellulose ether, 0.40%-0.60% of poly-carboxylic acid salt water reducer, and 0.04%-0.07% of sodium gluconate. Adding the expansion agent into concrete can effectively increase volume expansion of the concrete and reduce volume shrinkage of the concrete, thereby improving crack resistance and impermeability of the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete expansion agent production, in particular to a liquid concrete pumping expansion agent. Background technique [0002] Expansion agent is a kind of chemical admixture, which is added to cement. When the cement sets and hardens, the volume expands accordingly, which plays the role of compensating shrinkage and tensioning steel bars to generate prestress and fully filling the cement gap; 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, etc. Wide range of applications; [0003] At present, the expansion agents used in the market are basically in powder form, and the dosage is generally above 8.0%. Manual measurement and addition are ...

AI Technical Summary

Problems solved by technology

[0003] At present, the expansion agents used in the market are basically powdery, and the dosage is generally above 8.0%. Manual measurement and addition are often required during use. When the concrete production volume is large, the mixing time of each tray of concrete is short , the interval between the two trays is only about 5 minutes at most, and the amount of expansion agent used in each tray of concrete is more than 100kg. It takes a lot of physical strength to rely on manual input in such a short period of time, and the accuracy cannot be guaranteed. Metering cannot last for a long time, so it is not conducive to production and popularization, and the powdery expansion agent sold on the market is generally not effective, and the effect on reducing the volume shrinkage of concrete is not obvious