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Heat insulating material for flume and its preparation method

A thermal insulation material, aqueduct technology, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., to achieve the effect of easy dispersion and adsorption, reducing water absorption

Inactive Publication Date: 2010-11-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the amount of cement used in this type of thermal insulation material is relatively small, but more water is needed to stir the entire thermal insulation material to the construction consistency, so the hydration of the thermal insulation material cement will produce more voids than concrete or ordinary mortar, and because it can be redispersed The air-entraining effect of latex powder and hydroxypropyl methylcellulose ether will cause a large number of tiny pores in the insulation material, as well as large air bubbles introduced during the stirring process, which will further lead to the penetration and water absorption of the entire insulation material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A thermal insulation material for an aqueduct, which is formed by stirring and mixing dry mixture and water (stirring and mixing during construction), and the mass ratio of water to dry mixture is 1.2:1;

[0030] The components and ratio (mass percentage) of the dry mix are: Ordinary Portland cement (P.O 42.5, Huaxin Cement Co., Ltd.): 35%, and the bulk density is 80kg / m 3 Vitrified hollow microbeads (0.15-1.5mm in diameter, Wuhan Laikelian Technology Co., Ltd.): 54.9%, sepiolite fibers (5-10mm in length, Yixian Dazhi Thermal Insulation Building Materials Co., Ltd.): 2%, silicon Ash (the specific surface area is between 15000 and 20000m 2 / kg, commercially available): 3%, cement-based permeable crystalline material (SKB-202, Shanghai Seeker Waterproof Material Co., Ltd.) 1%, waste rubber powder (80 mesh, Huangshi Rubber Co., Ltd.): 3%, vinyl acetate Copolymer latex powder with ethylene (MP2050, Yilaitai Co., Ltd., Switzerland): 1%, with a viscosity of 100000 mPa·s Hydr...

Embodiment 2

[0037] An insulating material for an aqueduct, which is formed by stirring and mixing dry mixture and water (stirring and mixing during construction), and the mass ratio of water to dry mixture is 1.1:1;

[0038] The components and ratio (mass percentage) of the dry mix are: the strength grade is P.O 42.5 ordinary Portland cement: 40%, and the bulk density is 100kg / m 3 Vitrified hollow microspheres (0.15-1.5 mm in diameter): 44%, sepiolite fiber (5-10 mm in length): 4%, silica fume (specific surface area between 15000-20000m 2 / kg): 4%, cement-based osmotic crystalline material (commercially available, SKB-202, which is a commodity model produced by Shanghai Sink Waterproof Material Co., Ltd., and there are other similar products on the market): 2%, waste rubber powder (80 Mesh): 4%, vinyl acetate and ethylene copolymer latex powder (commercially available, MP2050): 1.75%, hydroxypropyl methylcellulose ether with a viscosity of 100000mPa·s: 0.25%.

[0039] The preparation met...

Embodiment 3

[0045] A thermal insulation material for an aqueduct, which is formed by stirring and mixing dry mixture and water, and the mass ratio of water to dry mixture is 1.1:1 (stirring and mixing during construction);

[0046] The dry mix is ​​composed of cement, vitrified hollow microspheres, sepiolite fiber, silica fume, cement-based osmotic crystalline material, waste rubber powder, redispersible latex powder and hydroxypropyl methylcellulose ether raw materials; each raw material accounts for The mass percentage of the dry mix is: cement 54.9%, vitrified hollow microspheres 35%, sepiolite fiber 2%, silica fume 3%, cement-based permeable crystalline material 1%, waste rubber powder 3%, redispersible latex Powder 1%, hydroxypropyl methylcellulose ether 0.1%.

[0047] Described cement is the ordinary Portland cement of No. P.O 42.5.

[0048] The particle diameter of the vitrified hollow microspheres is 0.15-1.5 mm, and the bulk density is 80-100 kg / m 3 , thermal conductivity ≤0.04...

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Abstract

The invention relates to a heat insulating material used for an aqueduct and a preparation method thereof. The heat insulating material used for the aqueduct is characterized in that the material is made by mixing and stirring dry mixture and water, the mass ratio of the water to the dry mixture is between 1.1:1 and 1.2:1; the dry mixture consists of cement, vitrified hollow beads, sepiolite fiber, siliceous dust, cement-based capillary crystalline material, waste rubber powder, re-dispersible emulsion powder and hydroxypropyl methyl cellulose; and the mass percentage of the raw materials of the dry mixture are: 35 to 54.9 percent of the cement, 35 to 54.9 percent of the vitrified hollow beads, 2 to 8 percent of the sepiolite fiber, 3 to 6 percent of the siliceous dust, 1 to 4 percent of the cement-based capillary crystalline material, 3 to 6 percent of the waste rubber powder, 1 to 5 percent of the re-dispersible emulsion powder and 0.1 to 0.5 percent of the hydroxypropyl methyl cellulose. The heat insulating material has the characteristics of low water absorbing rate, high cohesional strength and compressive strength, good anti-cracking ability and good stability.

Description

technical field [0001] The invention relates to a thermal insulation material for an aqueduct and a preparation method thereof. Background technique [0002] At present, it is generally believed at home and abroad that temperature stress is one of the important factors that cause cracks in concrete structures, especially for thin-walled concrete structures such as large aqueducts, where the internal water flow is large and the external environment changes continuously with the climate. The temperature of the outer wall of the aqueduct increases significantly due to solar radiation, while the inner wall of the aqueduct is in contact with water, and the temperature is lower, forming a large temperature difference between the inside and the outside, causing a large temperature stress on the aqueduct body; in winter, the ambient temperature is relatively low, and the water temperature in the aqueduct is relatively high. The outer wall of the aqueduct is in direct contact with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B14/38C04B18/22C04B14/22C04B28/04C04B14/04
CPCC04B28/02C04B2111/343C04B2111/28Y02W30/91C04B7/02C04B14/24C04B14/4643C04B18/146C04B18/22C04B20/0076C04B20/008C04B24/383C04B40/0028C04B2103/0057C04B24/2623
Inventor 余剑英李文超吴少鹏
Owner WUHAN UNIV OF TECH
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