Lightweight aggregate concrete for heat preservation of structures

A technology of lightweight aggregate concrete and structural insulation, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., to achieve the effects of improving performance, reducing structural weight, and reducing density difference

Active Publication Date: 2014-07-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the all-light concrete materials using modified vitrified microbeads and ceramsite as aggregates have not been reported in relevant literature.

Method used

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  • Lightweight aggregate concrete for heat preservation of structures
  • Lightweight aggregate concrete for heat preservation of structures
  • Lightweight aggregate concrete for heat preservation of structures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] According to the number of parts by mass: 337 parts of 42.5 grade ordinary Portland cement, 37 parts of fly ash, 110 parts of modified vitrified microspheres, 415 parts of clay ceramsite, 15.8 parts of concrete modifier, 3.74 parts of water reducer Parts, 273 parts of water. The concrete modifying agent comprises: 95.01% of dispersible latex powder; 0.24% of 3-5mm long chemical polypropylene fiber; and 4.75% of thickening agent in terms of mass percentage. The water reducer is a polycarboxylate high-efficiency water reducer, and its water reducing rate is 25%. It is prepared according to the above-mentioned preparation, molding and maintenance methods to obtain a finished product. Detect its performance, and the specific detection values ​​are shown in Table 1.

[0049] Table 1: Test items and test values ​​of the finished product of Implementation Example 1

[0050] project

Embodiment 2

[0052] Prepared by mass parts: 375 parts of 42.5 grade ordinary Portland cement, 42 parts of fly ash, 113 parts of modified vitrified microspheres, 447 parts of clay ceramsite, 17.9 parts of concrete modifier, 4.12 parts of water reducer part, 260 parts of water. The concrete modifier comprises: 94.16% of dispersible latex powder; 0.19% of 3-8mm long chemical polypropylene fiber; and 5.65% of thickening agent in terms of mass percentage. The water reducer is a polycarboxylate high-efficiency water reducer, and its water reducing rate is 25%. After the finished product is produced, its performance is tested, and the specific detection values ​​are shown in Table 2.

[0053] Table 2: Test items and test values ​​of the finished product of Implementation Example 2

[0054] project

Embodiment 3

[0056] Prepared in parts by mass: 409 parts of 42.5 grade ordinary Portland cement, 45 parts of fly ash, 120 parts of modified vitrified microspheres, 430 parts of ceramsite in saturated surface dry state, 19.3 parts of concrete modifier, 4.54 parts of water reducer, 261 parts of water. The concrete modifier comprises: 93.46% of dispersible latex powder; 0.31% of 3-8mm long chemical polypropylene fiber; and 6.23% of thickening agent in terms of mass percentage. The water reducer is a polycarboxylate high-efficiency water reducer, and its water reducing rate is 25%. After the finished product is produced, its performance is tested, and the specific detection values ​​are shown in Table 3.

[0057] Table 3: Test items and test values ​​of the finished product of Implementation Example 3

[0058] project

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Abstract

The invention relates to lightweight aggregate concrete for heat preservation of structures, and belongs to the technical field of building materials for civilian use. The lightweight aggregate concrete for heat preservation of structures comprises the following raw materials in parts by mass: 360-460 parts of cement-based cementing material, 410-460 parts of ceramsite, 110-120 parts of modified vitrified micro balls, 15-20 parts of concrete modifier, 260-290 parts of water and 3.6-4.6 parts of water reducing agent. The lightweight aggregate concrete for heat preservation of structures with the heat conductivity coefficient of 0.25-0.4W/(m.K) and the dry apparent density of 900-1200kg/m<3> is obtained by using the modified vitrified micro balls and the ceramsite as aggregates under the synergistic effect of the components according to a reasonable component proportion, and after the lightweight aggregate concrete is cured for 28 days, the compressive strength of the lightweight aggregate concrete is 8-15MPa. The lightweight aggregate concrete for heat preservation of structures has good heat preservation performance and relatively high strength. Compared with the strength of a full lightweight concrete material prepared from ceramsite perlite, the strength of the lightweight aggregate concrete is obviously improved; compared with the heat conductivity coefficient of a full lightweight concrete material prepared from ceramsite pottery sand, the heat conductivity coefficient of the lightweight aggregate concrete is obviously reduced; and the lightweight aggregate concrete can be used as a lightweight aggregate concrete material for heat preservation of structures.

Description

technical field [0001] The invention relates to a structural thermal insulation lightweight aggregate concrete, which belongs to the technical field of civil building material preparation. Background technique [0002] As the energy consumption of civil buildings increases, lightweight aggregate concrete is more and more widely used in the construction field, and people's requirements for lightweight aggregate concrete materials are also increasing. A series of superior characteristics such as light weight and low thermal conductivity of lightweight aggregate concrete are more and more popular in the building material market. With the deepening of people's understanding of lightweight aggregate, the problem that the thermal conductivity and strength of lightweight aggregate concrete cannot be balanced also brings great challenges to the further application of lightweight aggregate concrete. [0003] All-lightweight concrete is lightweight aggregate concrete in which coarse ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/08C04B14/22C04B14/04
CPCY02W30/91
Inventor 卫军陈兵董荣珍齐云轩王陈贵生刘优
Owner CENT SOUTH UNIV
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