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Intelligent shrinkage reducing agent for concrete, preparation method and application thereof

A technology of concrete and shrinkage reducing agent, which is applied in the field of intelligent shrinkage reducing agent for concrete and its preparation, which can solve the problems of increasing concrete shrinkage, achieve the effects of improving concrete shrinkage, improving durability and safety, and realizing low structural shrinkage

Inactive Publication Date: 2009-02-18
NANJING BAOYAN AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the incorporation of water reducing agents, the shrinkage of concrete will generally be increased. Therefore, the national "Concrete Admixtures" (GB8076-1997) has stipulated that even first-class products are allowed to have a shrinkage ratio of 135%.

Method used

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  • Intelligent shrinkage reducing agent for concrete, preparation method and application thereof
  • Intelligent shrinkage reducing agent for concrete, preparation method and application thereof
  • Intelligent shrinkage reducing agent for concrete, preparation method and application thereof

Examples

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Embodiment 1

[0026] Embodiment 1: the intelligent shrinkage reducing agent of the present invention is made of 10% polyacrylamide (average molecular weight 3,000,000), 7% polyether macromolecular surfactant (average molecular weight 1600), 18% bentonite, 50% rhettolite , 5% polypropylene (average molecular weight 6000); the above percentages are weight percentages.

Embodiment 2

[0027] Embodiment 2: the intelligent shrinkage reducing agent of the present invention is made of 20% polyacrylamide (average molecular weight 8,000,000), 2% polyether macromolecular surfactant (average molecular weight 1000), 22% bentonite, 44% rhettolite , 12% polypropylene (average molecular weight 10,000); the above percentages are percentages by weight.

Embodiment 3

[0028] Embodiment 3: the intelligent shrinkage reducing agent of the present invention is made of 12% polyacrylamide (average molecular weight 5,000,000), 5% polyether macromolecule surfactant (average molecular weight 1300), 33% bentonite, 42% rhettolite , 8% polypropylene (average molecular weight 8000); the above percentages are percentages by weight.

[0029] 2. Application of intelligent shrinkage reducing agent in concrete

[0030] During the implementation, the intelligent shrinkage reducer is firstly used as a carrier solvent with water, so that the ground particles are saturated with water in advance. Through the water absorption test in the early stage, it is determined that when the water absorption ratio is 140, a saturated gel can be obtained. First add sand and stone aggregates in the test mix ratio shown in Table 1, stir for 30 seconds, then add cementitious materials (cement and slag), and stir together for 30 seconds. Then add water-absorbing saturated gel an...

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PUM

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Abstract

The invention relates to a material which is developed with an aim at the facts that the prior concrete has the characteristics of low water binder ratio and great amount of external addition of minerals, the water contained in the prior concrete hardly satisfies the requirement on the full hydration of gel materials and the effect of external water supply for maintenance is not satisfactory. The aim of the invention is to provide an intelligent shrinkage reducing agent preparation process for concrete; as the concrete shrinkage reducing agent, the material can intelligently provide humidity in the concrete, and the addition of the material accounts for 0.03 to 0.05 wt percent with respect to the gel material in the concrete. The test result shows that the intelligent shrinkage reducing agent can keep the water in the concrete in a certain degree; the addition of the intelligent shrinkage reducing agent with an appropriate amount can remarkably reduce the shrinkage and deformation of the concrete so as to achieve the aim of improving the durability of the concrete.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to an intelligent shrinkage reducer for concrete and a preparation method and application thereof. Background technique [0002] Concrete is the most widely used building material in contemporary construction projects. Since the advent of cement and the birth of concrete in 1824, it has a history of nearly 200 years. Concrete engineering technology always progresses with the needs of engineering construction and the development of science and technology. of. At the same time, many new problems will appear in the application process of concrete, especially in recent years, the durability degradation of concrete. Accidents of structural damage due to insufficient durability occur frequently, and the resulting economic losses are also incalculable. [0003] Due to the composition and structural characteristics of modern concrete itself, the slurry is v...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B24/12C04B24/26
CPCC04B2103/58C04B40/0046
Inventor 何真孙海燕梁文泉陈衍
Owner NANJING BAOYAN AUTOMATION
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