A low-temperature curing agent for cement-based grouting materials for deep-water underwater concrete structures

A technology for concrete structures and grouting materials, applied in the field of low-temperature curing agents, can solve the problems of accelerating the strength development of grouting materials, difficult to ensure fluidity, long conveying pipelines, etc., so as to improve grouting, improve crack plugging efficiency, and improve the effect. Effect

Active Publication Date: 2021-07-23
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for deep-water underwater grouting, the grouting material needs to go through a long delivery pipeline. If the amount of water glass is large, it is difficult to ensure the fluidity during the transportation process. If the amount of water glass is small, it cannot effectively accelerate the development of the strength of the grouting material.
[0005] Adding resin-based polymer materials to cement-based grouting materials can also speed up the strength rate, but the cost is higher

Method used

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  • A low-temperature curing agent for cement-based grouting materials for deep-water underwater concrete structures
  • A low-temperature curing agent for cement-based grouting materials for deep-water underwater concrete structures
  • A low-temperature curing agent for cement-based grouting materials for deep-water underwater concrete structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In this embodiment, commonly used early strength agents in the market are aluminum sulfate, DC early strength agent of Beijing Dechang Weiye Construction Engineering Technology Co., Ltd., and calcium formate of Suzhou Longlong Chemical Technology Co., Ltd., all of which are mixed by external mixing method. First, mix the early strength agent 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 slurry is 0.45. Immediately after molding, put the mold 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 to test the compressive strength. Under this example, the strength test results are shown in Table 1 below. When several early strength agents were added, the early strength increased significantly compared with the slurry without additives at a low temperature of 5°C, but there was still a large gap with t...

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 mix it into shape. The water-cement ratio of the prepared slurry is 0.45. Immediately after molding, put the mold 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 to test the compressive strength. Under this example, the strength test results are shown in Table 2 below. After being mixed with crystal nucleus materials, the strength of 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 that under the standard curing condition of 20°C; crystal nucleus materials will also increase volume shrinkage .

[0027] Table 2 E...

Embodiment 3

[0030] In this embodiment, the expansion agent is selected from gypsum and calcium oxide expansion agents, and the dosage is 10% of the total amount of the cementitious material. Water is stirred into shape. The water-cement ratio of the prepared slurry is 0.45. Immediately after molding, put the mold 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 to test the compressive strength. Under this example, the strength test results are shown in Table 3 below. The expansion agent material has no obvious effect on the early strength. The expansion agent material can reduce part of the volume shrinkage, but the overall performance is still shrinkage deformation, because the time for the expansion agent to work cannot match the shrinkage of the slurry.

[0031] Table 3 Embodiment 3 Effect

[0032]

[0033]

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Abstract

The invention relates to a low-temperature curing agent for cement-based grouting materials for deep-water underwater concrete structures, which comprises the following components in terms of mass percentage: 15% to 50% of cement hydration catalyst components, 45% to 80% of expansion components, Plasticizing component 1% to 5%. 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 Two or more components in metal halides; the low-temperature curing agent of the present invention is chlorine-free and alkali-free, and the components coordinate to accelerate the hydration process of cement under low temperature conditions, and the dosage in the grouting material is powder 5% to 10% of the material, so that the strength of the cement-based grouting material in a low temperature environment (0°C~5°C) is not lower than the strength of the cement-based grouting material with the same mix ratio under the standard curing condition of 20°C, and the strength of the cement-based grouting material can be improved. The grouting material can be grouted without shrinkage and micro-expansion, and can be tightly bonded to the grouting base surface.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a low-temperature curing agent for cement-based grouting materials for deep-water underwater concrete structures, which is used for improving the strength development rate and volume expansion of cement-based grouting materials in low-temperature (0°C-5°C) environments , improve the plugging efficiency of cement-based grouting materials to cracks. Background technique [0002] When cracks appear in some deep-water underwater concrete structures, a large amount of water will leak, causing serious hazards. When the water depth is greater than 100m, the water temperature is only 0°C to 5°C. In this low temperature environment, the strength of cement-based grouting materials develops slowly. Usually, the strength of 1d can only reach 20% to 30% of that under the standard culture condition of 20°C. About 40%. However, when the water depth is less than 100m, the temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/38
CPCC04B40/0039C04B22/10C04B22/06C04B22/085C04B22/126C04B22/064C04B2103/0068C04B2103/302C04B24/383C04B22/128
Inventor 白银张丰蔡跃波宁逢伟陈波郭西宁胡海明
Owner NANJING HYDRAULIC RES INST
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