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High-performance pozzolanic concrete for high-rise pumping in plateau areas

A volcanic ash and super high-rise technology, applied in the field of building construction, can solve the problems of difficult pumping and low pumping efficiency, and achieve the effects of improving compactness, low cost of raw materials, and satisfying pumpability.

Active Publication Date: 2021-09-21
CHINA CONSTR EIGHT ENG DIV CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of the existing technology, a high-performance pozzolanic concrete for super-high-rise pumping in plateau areas is now provided to solve the problems of difficult pumping and low pumping efficiency of traditional high-strength concrete in plateau areas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0039] Φ14m×16mm and Φ16m×18mm steel sections are placed in the secondary grinding warehouse respectively, and the quantity ratio of the two different sizes of steel sections is 1:1.

[0040] Φ12m×14mm and Φ14m×16mm steel sections are placed in the three-stage grinding bin respectively, and the quantity ratio of the two different sizes of steel sections is 1.5:1.

[0041] The percentage by weight of the pozzolan obtained by grinding the coarse ash is 15% to 20%, the sieve residue of 0.045mm is 390cm 2 / g, water demand ratio 95% ~ 97%, loss on ignition (loss) 3 <0.1%.

[0042] As a preferred embodiment, the silicon dioxide content in silica fume is greater than 50%. After adding silica fume, the activity of concrete can be increased, and the strength of concrete can be improved, so as to compensate for the slow growth of concrete strength in the later stage caused by the slow growth of cement strength. .

[0043] As a preferred embodiment, the water reducer is a polycarboxyla...

no. 1 example

[0051] The invention provides a high-performance volcanic ash concrete used for super high-rise pumping in plateau areas, including cementitious materials, machine-made sand, stones, water and admixtures.

[0052] Cementitious materials include cement, pozzolan, silica fume, and microbeads. The additive is a water reducer.

[0053] Specifically, the raw materials in high-performance pozzolan concrete are composed of:

[0054] The consumption of water is 138kg;

[0055] The total amount of cementitious material is 600kg / m 3 , where the amount of cement is 450kg / m 3 , the amount of volcanic ash is 80kg / m 3 , the dosage of silica fume is 25kg / m 3 , the dosage of microbeads is 45kg / m 3 ;

[0056] The amount of water reducing agent is 2% of the total amount of cementitious materials;

[0057] The amount of machine-made sand is 660kg / m 3 , the sand ratio is 38%;

[0058] The ratio of water to glue is 0.23.

[0059] The workability of the high-performance pozzolan concrete...

no. 2 example

[0061] The invention provides a high-performance volcanic ash concrete used for super high-rise pumping in plateau areas, including cementitious materials, machine-made sand, stones, water and admixtures.

[0062] Cementitious materials include cement, pozzolan, silica fume, and microbeads. The additive is a water reducer.

[0063] Specifically, the raw materials in high-performance pozzolan concrete are composed of:

[0064] The consumption of water is 138kg;

[0065] The total amount of cementitious material is 600kg / m 3 , where the amount of cement is 430kg / m 3 , the amount of volcanic ash is 100kg / m 3 , the dosage of silica fume is 25kg / m 3 , the dosage of microbeads is 45kg / m 3 ;

[0066] The amount of water reducing agent is 1.5% of the total amount of cementitious materials;

[0067] The amount of machine-made sand is 660kg / m 3 , the sand rate is 38%;

[0068] The ratio of water to glue is 0.23.

[0069] The workability of the high-performance pozzolan concre...

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Abstract

The invention provides a high-performance pozzolanic concrete for super-high-rise pumping in plateau areas, including cementing materials, machine-made sand, stone, water and admixtures. The cementing materials include cement, pozzolan, silica fume, and microbeads. , the admixture is a water reducer; the raw materials in the high-performance pozzolan concrete are composed of: the amount of water ≤ 150kg; the total amount of the cementitious material is 550kg / m 3 ~600kg / m 3 , wherein, the consumption of the cement is 70% to 75% of the total amount of the cementitious material, the consumption of the pozzolan is 15% to 20% of the total amount of the cementitious material, and the consumption of the silica fume is 2% to 5% of the total amount of the gelling material, the amount of the microbeads is 5% to 10% of the total amount of the gelling material; the amount of the water reducer is the total amount of the gelling material 1.5% to 2.0% of that; the amount of machine-made sand is 600kg / m 3 ~660kg / m 3 , the sand rate is 36% to 38%; the water-binder ratio is not more than 0.25. The invention solves the problems of difficulty in pumping traditional high-strength concrete and low pumping efficiency in plateau areas.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a high-performance volcanic ash concrete used for super high-rise pumping in plateau areas. Background technique [0002] In recent years, with the development of large-scale infrastructure construction in our country, high-rise buildings and super high-rise buildings are increasing day by day. As the height of the building increases, the pumping pressure gradually increases during the concrete construction process, especially in plateau areas, where the average altitude exceeds 2,300 meters. The effect of atmospheric pressure also has a certain impact on the pumping pressure, especially in the traditional high-strength concrete, the high-strength concrete itself has a relatively high viscosity, and it is very difficult to pump in plateau areas with an average altitude of more than 2,300 meters. Contents of the invention [0003] In order to overcome the defects ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B111/20
CPCC04B28/02C04B2111/00293C04B2111/20C04B2201/50C04B14/14C04B18/146C04B14/22C04B2103/302
Inventor 胡泽宇
Owner CHINA CONSTR EIGHT ENG DIV CORP LTD