Shotcrete and preparation method thereof

A shotcrete and mixture technology, applied in the field of high-performance concrete, can solve the problems of raw material waste and large rebound rate of shotcrete, and achieve the effects of reducing waste, reducing rebound and increasing viscosity

Active Publication Date: 2018-05-11
四川通德商品混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even though the wet spraying technology greatly reduces the dust pollution and the rebound rate during the concrete spraying process compared with the dry spraying technology, the large rebound rate of shotcrete is still not negligible
During the use of shotcrete, the essence of shotcrete rebound is the impact problem between raw material particles. Once there is no collision between the raw material particles and there is no energy loss after the shotcrete hits the spray surface, it means that the raw material particles are completely sprayed. Surface rebound, resulting in serious waste of raw materials

Method used

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  • Shotcrete and preparation method thereof
  • Shotcrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] S1: Take 970kg of sand and 647kg of crushed stone and stir, and the mixing time is 16s to obtain a mixture, wherein the particle size of crushed stone is 10mm;

[0027] S2: Take 404 kg of Portland cement and add it to the mixture obtained in S1, and the mixing time is 18s to obtain the mixture;

[0028] S3: Take 0.8 kg of 2,6-dimethyl-7-octene-2-ol, 0.8 kg of cis-3-hexenol formate, and 202 kg of water into the ultrasonic mixer. The reaction temperature is 100°C. The stirring time is 37 minutes, then 6.46 kg of quaternary ammonium salt polycarboxylic acid water reducing agent, 8.08 kg of polyaluminum sulfate, and 8.08 kg of sodium carbonate are added, and the mixture is stirred for 2 minutes to obtain a mixture;

[0029] S4: Load the mixture obtained from S3 into the sprayer, and use high-pressure air to transport it to the nozzle. At the same time, the mixture obtained by S2 is passed through the nozzle of the sprayer. After mixing the mixture obtained by S2 and the mixture ob...

Embodiment 2

[0031] S1: Take 950kg of sand and 610kg of crushed stone and stir, and the stirring time is 15s to obtain the mixture, wherein the particle size of the crushed stone is 12mm;

[0032] S2: Take 428kg of Portland cement and add it to the mixture obtained in S1, and the mixing time is 17s to obtain the mixture;

[0033] S3: Take 0.8 kg of 2,6-dimethyl-7-octene-2-ol, 1 kg of cis-3-hexenol formate, and 190 kg of water into the ultrasonic stirrer. The reaction temperature is 90°C and stir The time is 36 minutes, after which 5.86 kg of quaternary ammonium salt polycarboxylic acid water reducing agent, 8.16 kg of polyaluminum sulfate, and 8.16 kg of sodium carbonate are added, and stirred for 1 minute to obtain a mixture;

[0034] S4: Load the mixture obtained from S3 into the sprayer, and use high-pressure air to transport it to the nozzle. At the same time, the mixture obtained by S2 is passed through the nozzle of the sprayer. After mixing the mixture obtained by S2 and the mixture obtain...

Embodiment 3

[0036] S1: Take 990kg of sand and 610kg of crushed stone and stir, and the stirring time is 15s to obtain the mixture, wherein the particle size of crushed stone is 12mm;

[0037] S2: Take 380kg of Portland cement and add it to the mixture obtained in S1, and the mixing time is 19s to obtain the mixture;

[0038] S3: Take 0.9 kg of 2,6-dimethyl-7-octene-2-ol, 1 kg of cis-3-hexenol formate, and 190 kg of water into the ultrasonic stirrer. The reaction temperature is 110°C and stir The time is 36 minutes, after which 5.86 kg of quaternary ammonium salt polycarboxylate water reducing agent, 8.16 kg of polyaluminum sulfate, and 8 kg of sodium carbonate are added, and stirred for 3 minutes to obtain a mixture;

[0039] S4: Load the mixture obtained from S3 into the sprayer, and use high-pressure air to transport it to the nozzle. At the same time, the mixture obtained by S2 is passed through the nozzle of the sprayer. After mixing the mixture obtained by S2 and the mixture obtained by S3,...

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Abstract

The invention relates to shotcrete and belongs to the field of high-performance concrete. The shotcrete solves the problem that in use of the existing shotcrete, raw materials are wasted. The shotcrete comprises, by weight, 190 to 214 parts of water, 380 to 428 parts of Portland cement, 950 to 990 parts of sand, 610 to 684 parts of broken stones, 5.86 to 7.06 parts of a water reducing agent, 16 to16.32 parts of an accelerator, 0.7 to 0.9 parts of 2, 6-dimethyl-7-octene-2-ol and 0.6 to 1 part of cis-3-hexenyl formate. After the concrete is sprayed onto the sprayed surface, the cohesion of theraw material particles is increased so that the raw material particles are timely adsorbed to the sprayed surface and the rebound rate of the shotcrete is reduced.

Description

Technical field [0001] The invention relates to the field of high-performance concrete, more specifically, it relates to a sprayed concrete and a preparation method thereof. Background technique [0002] Shotcrete is a kind of concrete that is sprayed on the sprayed surface at high speed by a sprayer, and then quickly solidified and hardened. During the construction process of sprayed concrete, the gypsum in the cement becomes sodium sulfate under the action of the accelerator, which loses the retarding effect, thereby promoting C in the cement 3 A quickly hydrates, and C precipitates out 3 The hydration product crystal of A, the cement slurry hardens quickly to achieve the effect of early strength. At the same time, the concrete mixed with accelerator can generally set in five minutes and finally set in ten minutes. [0003] There are two main types of concrete spraying technology: dry spraying and wet spraying. Dry spraying is to mix cement, gravel aggregate and quick-setting age...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B24/26
CPCC04B24/26C04B28/04C04B2201/50C04B22/002C04B14/06C04B14/02C04B24/24C04B22/148C04B22/10
Inventor 宋勇波
Owner 四川通德商品混凝土有限公司
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