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Cement matrix used for concrete canvas system

A concrete canvas and cement technology, which is applied in the field of concrete canvas materials, can solve problems such as high energy consumption, high pollution, and inability to solidify powders, and achieve the effects of reducing drying shrinkage, improving drying shrinkage problems, and excellent mechanical properties

Active Publication Date: 2018-09-25
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because of the high energy consumption and high pollution environmental problems in the production process of this kind of cement, it is not conducive to sustainable development.
The alkali-activated slag cementitious material as a cement matrix can realize waste utilization on the one hand and exhibit excellent performance on the other hand; but if the alkali-activated cementitious material used in the alkali-activated concrete system is directly applied to the concrete canvas After sprinkling water, it was found that the powder of the alkali-activated cementitious material was lost in large quantities, resulting in the powder remaining in the three-dimensional fabric of the concrete canvas unable to solidify
[0005] Under normal temperature curing, the drying shrinkage of alkali-activated cementitious materials is 4 to 6 times that of Portland cement, which seriously restricts the application of alkali-activated concrete in practical engineering.

Method used

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  • Cement matrix used for concrete canvas system
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  • Cement matrix used for concrete canvas system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the novel cement matrix that is used for concrete canvas system provided by the present invention, according to parts by weight, this cement matrix is ​​made up of following components: industrial waste residue: 550 parts-650 parts, water glass: 280 parts-380 parts, Gelling agent: 85-125 parts, shrinkage reducing agent: 80-120 parts. Among them, the industrial waste slag is granulated blast furnace slag; the water glass is instant water glass powder, and the water glass modulus is 2.0; the gelling agent is sulfoaluminate cement, Belite sulfoaluminate cement, high alumina cement or silicic acid Salt cement; shrinkage reducing agent is calcium oxide, magnesium oxide.

[0025] The method of using the above-mentioned new cement matrix for the concrete canvas system is to fully stir the cement powder, fill it into the three-dimensional fabric, and then sprinkle it with water; in order to make the alkali-activated slag suitable for the concrete canvas system as ...

Embodiment 2

[0027] Example 2: The drying shrinkage performance of the new cement matrix has been significantly improved after the shrinkage reducing agent is added, and it has been further optimized when the water immersion curing condition is adopted. For details, see image 3 Figure 4 and Figure 5 .

Embodiment 3

[0028] Embodiment 3: the cement matrix provided by the present invention prepares the concrete canvas sample, weighs 310 parts of water glass, 630 parts of slag and 94 parts of gelling agent powder and mixes evenly, stirs 3min, is prepared into uniform cement powder, fills to use In the 10mm polyester three-dimensional spacer fabric for the preparation of concrete canvas, it is sprayed with water after molding, and the water-binder ratio is 0.37.

[0029] The samples were cured naturally at a temperature of 20±2°C and a humidity of 60±5%. Then, cut a sample of 10mm (length)*10mm (width)*10mm (thickness), and measure its compressive strength. The compressive strength of the sample was tested with reference to the standard ASTM C109 / C109M, and the setting time was tested with reference to GB / T1346-2001 "Cement Standard Consistency Water Concentration Test Method for Setting Time Stability".

[0030] Test results: The final setting time of the concrete canvas sample is 85 minute...

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Abstract

The invention discloses a cement matrix used for a concrete canvas system. The cement matrix is prepared from the following components in parts by weight: 55 to 65 parts of industrial waste residues,28 to 38 parts of sodium silicate, 8.5 to 12.5 parts of a gelling agent and 8 to 12 parts of a shrinkages reducing agent. According to the cement matrix disclosed by the invention, the alkali loss problem of an alkali-activated gel material is solved, and the novel cement matrix of the concrete canvas is formed by carrying out alkali activation on a slag system; the industrial waste residues are recycled and environment pollution caused by carbon emission is reduced; after a product disclosed by the invention is molded and cured, the compression strength in the thickness direction is 25MPa after 10 days and the compression strength in the warp direction reaches 40MPa and reaches the intensity level of a sulphoaluminate cement concrete canvas; the later-period dry shrinkage is reduced by 90percent or more.

Description

technical field [0001] The invention relates to the technical field of concrete canvas materials, in particular to a cement matrix used in a concrete canvas system. Background technique [0002] Concrete canvas is a new type of construction material. It is prepared by filling cement powder materials into three-dimensional spacer fabrics. During the construction process, it can be exposed to water on its surface to form architectural structures of various shapes; the new stage of concrete canvas is mainly used in projects where traditional concrete is inconvenient for construction. Such as mountain slope protection, ditch slope, underwater pipeline maintenance and other projects. In addition, concrete canvas is low in cost, excellent in performance, fast in construction speed, requires a small number of construction personnel, and has simple construction equipment, so it has a good prospect. [0003] The alkali-activated slag system is a new type of cementitious material. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B28/34
CPCC04B28/26C04B28/34C04B2201/50C04B18/142C04B22/064C04B22/066C04B7/32C04B7/02
Inventor 陈惠苏崔国健刘勇超
Owner SOUTHEAST UNIV
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