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Vacuum concrete mixing process

A vacuum mixing and concrete technology, which is applied in the field of concrete mixing, can solve the problems such as the inability to reduce concrete pores, and achieve the effects of avoiding water evaporation, reducing porosity and simple process.

Inactive Publication Date: 2016-08-31
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water reducing agent can only reduce the pores formed by the evaporation of water in the concrete, but cannot reduce the pores formed by the air entrainment of the concrete due to stirring

Method used

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  • Vacuum concrete mixing process

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the present embodiment provides a concrete vacuum mixer, including a motor 1 and a mixing drum 2, the mixing drum 2 is provided with a feed inlet; a sealing cover 5 and a vacuum pump 3 are also included; The mixing drum 2 is connected; the sealing cover 5 seals the feeding port.

[0035] A sealing groove is opened around the feed inlet, and a sealing ring 4 is installed in the sealing groove, and the sealing ring 4 is in contact with the sealing cover 5 .

[0036] A handle 7 is mounted on the sealing cover 5 .

[0037] A testing device is installed on the pipeline 8 , and the testing device includes but not limited to a vacuum gauge 9 .

[0038] The pipeline 8 has three openings, one opening communicates with the inside of the mixing drum 2 , one opening communicates with the vacuum pump 3 , and a valve 10 is installed at one opening.

[0039] The sealing cover 5 is fixed to the mixing drum 2 through fasteners 6 .

[0040] In the vacuum mi...

Embodiment 2

[0042] This embodiment provides a concrete vacuum mixing process, comprising the following steps:

[0043] S1. Prepare mixer, vacuum pump 3, pipeline 8 and sealing cover 5; Described mixer comprises mixing drum 2, has feed inlet on mixing drum 2; Described vacuum pump 3 is communicated with mixing drum 2 through pipeline 8; Said sealing The cover 5 seals the feed port; the pipeline has three openings, one opening communicates with the inside of the mixing drum, one opening communicates with the vacuum pump, and one opening is equipped with a valve; the sealing cover 5 is connected to the The mixing drum 2 is fixed.

[0044] S2. Add raw materials to the mixing drum 2 of the mixer;

[0045] S3. close the valve, and seal the feeding port of the mixing drum 2 with the sealing cover 5;

[0046] S4. Start the vacuum pump 3 to evacuate the inside of the mixing drum 2;

[0047] S5. stop vacuuming, start the mixer to mix the concrete;

[0048] S6. stop stirring, slowly open valve 1...

Embodiment 3

[0057] The difference between this embodiment and embodiment 2 is that the raw material does not include a water reducing agent, but a vacuum gauge 9 is installed on the pipeline to measure the air pressure in the mixing drum, and vacuum is drawn to the mixing drum 2 according to step S4 The air pressure inside is A; when the air pressure is A, the boiling point of water is B; B is greater than the temperature outside the mixing drum. In this example, the ambient temperature is 25°C, the air pressure A is 5kPa, and when the air pressure A is 5kPa, the boiling point of water is 32.9°C, and the ambient temperature is lower than the boiling point of the water in the mixing drum. Under normal stirring conditions, the moisture in the concrete will not evaporation. By controlling the minimum air pressure in the mixing drum, the porosity can be significantly reduced by only vacuuming without using a water reducer. In this embodiment, by adjusting the vacuum degree and mixing time in...

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Abstract

The invention provides a vacuum concrete mixing process. The vacuum concrete mixing process is characterized in that via simple structural modification, after a mixing drum of a mixer is sealed, the interior of the mixing drum is vacuumized, that is, before mixing, a certain vacuum degree is formed in the mixing drum, so that contact between freshly mixed concrete slurry and air in the mechanical mixing process is greatly reduced, formation of bubbles in concrete is reduced, and accordingly, the porosity is greatly reduced. Furthermore, the minimum pressure in the mixing drum is controlled, so that the ambient temperature is lower than the boiling point of moisture in the mixing drum, accordingly, moisture evaporation is avoided, the phenomenon that pores are formed by moisture evaporation is prevented, and the porosity is further reduced. The vacuum concrete mixing process is simple, is convenient to operate, and can efficiently improve the concrete compactness, strength and durability.

Description

technical field [0001] The invention relates to the technical field of concrete mixing, and more specifically, relates to a concrete vacuum mixing process. Background technique [0002] Reducing the porosity of concrete can improve the compactness, strength and durability of concrete. Pores in concrete usually come from two aspects: (1) stirring air. The fresh concrete paste is in contact with air during the mechanical mixing process, forming air bubbles in the concrete, the air bubbles are constantly evolving (such as coalescing, diffusing, and collapsing) in the fresh concrete, and after the concrete hardens, unbroken air bubbles are formed in the concrete Pores; (2) Evaporation of water. During the setting and hardening of cement, the water that does not participate in the hydration of the cement will evaporate, forming pores in the concrete. [0003] The continuous development of water reducing agent technology can greatly reduce the water consumption of concrete whil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C5/46B28C5/14
CPCB28C5/464B28C5/14
Inventor 欧志华
Owner HUNAN UNIV OF TECH
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