A low-temperature curing agent for concrete

Abstract

The invention discloses a concrete low-temperature curing agent, which comprises the following components in terms of mass percentage: 4%-60% of a cement hydration catalyst component, 35%-95% of an anti-cracking component, and 0.3%-95% of a plasticizing component. 10%. The cement hydration catalytic component is composed of a crystal nucleus and a catalyst. The crystal nucleus is composed of one or more composites of nano-silica, nano-calcium carbonate and nano-alumina. The catalyst is composed of lithium nitrate, iron sulfate and alkaline earth One or more components of metal halides; the concrete low-temperature curing agent of the present invention is chlorine-free and alkali-free, and each component coordinates to accelerate the hydration process of concrete under low-temperature conditions, and the dosage in concrete is 5 % to 10%, which can make the strength of concrete in a low temperature environment (0℃~5℃) not lower than that of concrete with the same mix ratio under standard curing conditions of 20℃, greatly reducing the maintenance cost of concrete in low temperature climates, and at the same time The workability and deformation properties of concrete are not significantly affected.

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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