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Air-entraining agents, cement concrete with air-entraining agents, and their application in slipform construction

A technology of cement concrete and air-entraining agent, applied in the field of cement concrete, can solve the problems that the quality and speed advantages of construction machinery cannot be fully utilized, cracking, and insufficient flatness, etc., to achieve compact durability and dynamic flatness, improve Improvement of workability and durability

Inactive Publication Date: 2016-04-06
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Sagging, pockmarks, cracking, and insufficient flatness are common phenomena in slipform construction, which lead to the inability to give full play to the quality and speed advantages of construction machinery. Most of the reasons are related to the workability of cement concrete mixture.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047]The air-entraining agent of the present invention is by weight percentage sodium lauryl sulfate 16.6%, ethoxylated alkyl sodium sulfate 27.8%, coconut oil diethanolamide 5.6%, water 50%, is mixed with the aqueous solution of solute content 50%, then Then dilute to 3%, mix it into concrete according to 0.3% of the cement dosage (equivalent solid content 0.09‰), the initial slump of the concrete is 30mm, the initial air content is 7.5%, and the air content is 6.8% in 1 hour; After pounding for 15 seconds, the remaining air content of the concrete is 4.8%. Concrete air-entrained bubbles are relatively stable without high-frequency vibration, and the structure of air-entrained bubbles is effectively adjusted under high-frequency vibration, and the final residual value is within the effective range specified in the specification (4-6%).

[0048] The above-mentioned chemical reagents used in the present invention were all purchased from Beijing Tongguang Fine Chemical Co., Ltd...

Embodiment 2

[0050] The air-entraining agent of the present invention is by weight percentage sodium lauryl sulfate 20%, ethoxylated alkyl sodium sulfate 5%, coconut oil diethanolamide 3%, water 72%, is mixed with the aqueous solution of solute content 28%, then Then dilute to 3%, mix it into concrete according to 0.3% of cement dosage (equivalent solid content 0.09‰), the initial slump of concrete is 40mm, the initial air content is 7.5%, and the air content is 5.8% in 1h; After pounding for 15 seconds, the remaining air content of the concrete is 5.8%.

Embodiment 3

[0052] The air-entraining agent of the present invention is by weight percentage sodium lauryl sulfate 10%, ethoxylated alkyl sodium sulfate 40%, coconut oil diethanolamide 6%, water 44%, is mixed with the aqueous solution of solute content 56%, then Then dilute to 3%, mix it into concrete according to 0.3% of the cement dosage (equivalent solid content 0.09‰), the initial slump of the concrete is 20mm, the initial air content is 7.0%, and the air content is 6.5% in 1 hour; After pounding for 15 seconds, the remaining air content of the concrete is 4.3%.

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PUM

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Abstract

The invention relates to an air entrainer, a cement concrete with the added air entrainer and an application of the air entrainer and the cement concrete in slip-form construction, the air entrainer is an aqueous solution, wherein the solute comprises a high efficiency air entraining component, a hard water-resistance air entraining component, and a foam stabilizing component; wherein the weight ratio of the high efficiency air entraining component to the hard water-resistance air entraining component to the foam stabilizing component is 10-20: 5-40: 1-10.

Description

technical field [0001] The invention relates to an air-entraining agent, in particular to an air-entraining agent for pavement cement concrete used for slip-form construction, cement concrete added with the air-entraining agent, and their application in slip-form construction. Background technique [0002] Slipform paver construction is a large-scale modern mechanized cement concrete pavement construction method with the fastest construction speed, the highest level of automation and the best construction quality in the world today. The cement concrete used for slipform paving is typical low slump pavement concrete. [0003] Sagging, pitting, cracking, and insufficient flatness are common phenomena in slipform construction, which lead to the inability to fully utilize the quality and speed advantages of construction machinery. Most of the reasons are related to the workability of cement concrete mixture. [0004] If the slump is large, the plasticity and easy density of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16C04B28/00C04B103/30
Inventor 柯国炬田波刘英彭鹏李思李
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT