A low-temperature curing agent for concrete

A low-temperature curing and concrete technology, applied in the field of building materials, can solve problems such as difficulty in control, decrease in concrete strength, and large strength loss.

Active Publication Date: 2021-04-09
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A low-temperature curing agent for concrete
  • A low-temperature curing agent for concrete
  • A low-temperature curing agent for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this example, commonly used early-strength agents in the market are AFA concrete super-early-strength agents from Henan Aluminum City Juneng Industrial Co., Ltd., DC early-strength agents from Beijing Dechang Weiye Construction Engineering Technology Co., Ltd., and Suzhou Longlong Chemical Technology Co., Ltd. Calcium formate is mixed by external mixing method. First, the early strength agent is mixed into the cementitious material and mixed evenly, and then water and sand are added to stir and form. The water-cement ratio of the prepared mortar is 0.45, and the ratio of mortar to sand is 1:3. Immediately after forming the mortar, put it into a low-temperature curing box at 5±1°C and a standard curing box at 20±1°C for curing until the specified age and then take it out. Test for compressive strength. Under this example, the strength test results are shown in Table 1 below. Mixing several kinds of early strength agents respectively, compared with the mortar without ...

Embodiment 2

[0026] This embodiment uses crystal nucleus materials alone, including silicon powder, nano-SiO 2 , Nano CaCO 3 etc., using the external mixing method to mix, first mix the crystal nucleus material into the cementitious material and dry mix it evenly, then add water and sand and mix it into shape. The water-cement ratio of the prepared mortar is 0.45, and the ratio of mortar to sand is 1:3. Immediately after forming the mortar, put it into a low-temperature curing box at 5±1°C and a standard curing box at 20±1°C for curing until the specified age and then take it out. Test for compressive strength. Under this example, the strength test results are shown in Table 2 below. After the crystal nucleus material is added, the strength of the mortar for 1-3 days is also significantly improved, and the improvement range is slightly lower than that of ordinary early strength agents, and it cannot be compared with the mortar strength under the standard curing condition of 20°C; the cry...

Embodiment 5

[0027] Table 2 Embodiment 5 Effect

[0028]

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
CPCC04B40/0039C04B22/10C04B22/06C04B22/128C04B22/064C04B22/142C04B22/143C04B2103/302C04B24/383C04B22/085C04B22/066
Inventor 张丰白银蔡跃波宁逢伟陈波曹志伟郭西宁胡海明
Owner NANJING HYDRAULIC RES INST
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