A kind of intelligent shrinkage reducing agent for concrete and its preparation method and application

A technology of concrete and shrinkage reducing agent, applied in the field of intelligent shrinkage reducing agent for concrete and its preparation, can solve problems such as increasing concrete shrinkage, and achieve the effects of improving concrete shrinkage, solving drying shrinkage, and improving durability and safety

Inactive Publication Date: 2011-11-30
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 allow a shrinkage ratio of 135%.

Method used

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  • A kind of intelligent shrinkage reducing agent for concrete and its preparation method and application
  • A kind of intelligent shrinkage reducing agent for concrete and its preparation method and application
  • A kind of intelligent shrinkage reducing agent for concrete and its preparation method and application

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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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Abstract

The present invention is a new material developed in view of the characteristics of low water-binder ratio of modern concrete, large amount of added minerals, difficulty in meeting the sufficient hydration requirements of cementitious materials with internal moisture, and poor external water supply and maintenance effect. The purpose of the present invention is to provide a preparation process of an intelligent shrinkage reducer for concrete, and as a concrete shrinkage reducer, it can intelligently provide humidity inside the concrete, and its dosage is 0.03-0.05wt% of the cementitious material in the concrete. The test results show that the intelligent shrinkage reducing agent has a certain retention effect on the moisture in the concrete, and its moisture can form an intelligent release curing mechanism inside the concrete material. Shrinkage reducing agent can significantly reduce the shrinkage and deformation properties of concrete to achieve the purpose of improving the durability of 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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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/32C04B24/12C04B24/26
CPCC04B40/0046C04B2103/58
Inventor 何真孙海燕梁文泉陈衍
Owner NANJING BAOYAN AUTOMATION
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