Concrete low-temperature curing agent

Abstract

The invention discloses a concrete low-temperature curing agent, which is prepared from the following ingredients in percentage by mass: 4 to 60 percent of cement hydration catalysis ingredients, 35 to 95 percent of anti-cracking ingredients and 0.3 to 10 percent of plastification ingredients, wherein the cement hydration catalysis ingredients are prepared from crystal nucleus and catalysts; the crystal nucleus is prepared by compounding one or several kinds of materials from nanometer silicon dioxide, nanometer calcium carbonate and nanometer aluminum oxide; the catalysts are prepared from one or several kinds of materials from lithium nitrate, ferric sulfate and alkali-earth metal halide. The concrete low-temperature curing agent does not contain chlorine or alkali; all ingredients are cooperated to achieve the effect of accelerating the hydration process of the concrete under the low-temperature condition; when the agent is added into the concrete at the mixing quantity of 5 to 10 percent, the intensity of the concrete in a low-temperature environment being 0 to 5 DEG C is not lower than the intensity of the concrete of the same mixture ratio under the standard curing conditionof 20 DEG C; the curing cost of the concrete at the low-temperature climate can be greatly reduced; meanwhile, no obvious influence exists on the work performance and deformation performance of the concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a concrete low-temperature curing agent, which is used for increasing the strength development rate of concrete in a low-temperature (0°C-5°C) environment and reducing the cost of concrete maintenance. Background technique [0002] In the low temperature environment of 0℃~5℃, the strength of concrete develops slowly. Usually, the strength of 1d can only reach 20%~30% of that under the standard culture condition of 20℃, and it can reach about 40% in 3d. In order to ensure the quality of the project and the progress of the construction, maintenance measures such as setting up insulation sheds, electric furnace heating, gas furnace heating, and steam heating are required in this case, which are costly. For some specific engineering structures, accelerated maintenance cannot even be implemented. For example, the No. 0 block of a continuous rigid frame bridge with high piers ...

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Problems solved by technology

The main problems of traditional early strength agents are as follows: ① the loss of concrete strength in the later period is relatively large; ② more chloride ions or sulfate groups will be introduced, which will increase the risk of steel corrosion and sulfate erosion in concrete; ③ organic alcohol amine early strength agents Contains a large amount of hydroxyl groups, the dosage is small, difficult to control, and it is easy to cause problems such as serious retardation of concrete and decrease in concrete strength; ④ Early strength agents are mostly used at room temperature, and the early strength effect is limited at low temperatures below 5°C

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