Green low-creep concrete

A low-creep, concrete technology, applied in the field of building materials, can solve problems such as land secondary pollution, achieve the effects of reducing the amount of use, improving activity, and high comprehensive benefits

Inactive Publication Date: 2021-09-03
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sludge from urban waterworks is often discarded and randomly piled up without harmless treatment, causing secondary pollution to the land

Method used

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  • Green low-creep concrete

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Experimental program
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preparation example Construction

[0025] The preparation method of the sludge powder from the waterworks comprises the following steps: (1) the sludge particles from the waterworks are uniformly heated for 0.6h, filled with steam during the heating process, and the microwave is turned on at full power for 25min at the same time, and the temperature in the kettle is stabilized at Between 185°C and 195°C, the pressure is controlled at 1.25MPa to 1.35MPa, and the temperature is kept constant for 5 hours; (2) Turn off all microwaves, turn off the power and cool down for about 1.5 hours, open the kettle door, dry and screen out sludge particles larger than 6mm in size (3) Calcining sludge particles with a particle size of less than 3mm at a temperature of 700-900°C for 1-2h, and calcining sludge particles with a particle size of 3-6mm at a temperature of 900-1000°C for 2-4h; (4) Natural cooling and mixing according to the mass ratio of 1:1 and grinding to obtain sludge powder from waterworks.

[0026] Furthermore, ...

Embodiment 1

[0032] Green low-creep concrete prepared by waterworks sludge powder and fine ceramic microbead aggregate, calculated by weight components, includes the following components,

[0033] 340 parts of cement with P O 52.5, 56 parts of sludge powder from waterworks, 45 parts of white corundum powder, 652 parts of river sand, 72 parts of fine ceramic microbead aggregate, 1087 parts of crushed stone, 136 parts of water, and 4.5 parts of water reducing agent parts, the water-to-binder ratio is 0.3.

[0034] The technical indicators of the green low-creep concrete in this embodiment: the compressive strength of the 28d concrete is 59.8MPa, and the creep degrees of different ages are shown in Table 1.

Embodiment 2

[0036] Green low-creep concrete prepared by waterworks sludge powder and fine ceramic microbead aggregate, calculated by weight components, includes the following components,

[0037] 355 parts of cement with P O 52.5, 51 parts of sludge powder from waterworks, 46 parts of white corundum powder, 644 parts of river sand, 71 parts of fine ceramic microbead aggregate, 1072 parts of crushed stone, 152 parts of water, and 4.6 parts of water reducing agent parts, the water-to-binder ratio is 0.33.

[0038] The technical indicators of the green low-creep concrete in this embodiment: the compressive strength of the 28d concrete is 57.1MPa, and the creep degrees of different ages are shown in Table 1.

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Abstract

The invention provides green low-creep concrete, which is prepared from the following components in parts by weight: 340 to 385 parts of cement, 45 to 56 parts of waterworks sludge powder, 45 to 48 parts of white corundum powder, 622 to 652 parts of river sand, 69 to 72 parts of fine ceramic microbead aggregate, 1036 to 1087 parts of gravel, 136 to 192 parts of water and 4.5 to 4.8 parts of a water reducing agent. The green low-creep concrete provided by the invention is beneficial to harmless treatment of sludge, and also can reduce the consumption of resources such as cement and natural river sand.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a green low-creep concrete. Background technique [0002] Creep is the inherent time-varying characteristic of concrete materials, which has a direct and significant impact on the stress and deformation properties of concrete structures, and then affects the use and durability of structures, especially for long-span prestressed concrete bridges. Impact. Excessive creep will easily cause excessive mid-span deflection of the main span of the bridge and cracking of the beam body. Therefore, in many projects, the final value of concrete creep is required to be small and to stabilize quickly, so as to ensure the safety and stability of the concrete structure in the project. [0003] With the continuous increase of urban population, in order to ensure urban water supply, additional waterworks are also increasing day by day, resulting in more and more sludge from waterworks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/52C04B14/02C04B14/06C04B14/303C04B18/023C04B2103/302C04B18/0427
Inventor 何智海王灯灯
Owner SHAOXING UNIVERSITY
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