A method for treating the bonded surface of old and new concrete

A new and old concrete, treatment method technology, applied in the direction of bridge parts, bridge erection/assembly, bridge maintenance, etc., can solve the problems of complex exposed concrete, strict construction technology, not widely used, etc., to achieve the improvement of inclined plane compressive shear strength, Improvement of tensile strength and effect of cost reduction

Active Publication Date: 2016-01-06
秦皇岛市政建材集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The acid etching method is to pickle the surface of the old concrete with a certain concentration of acid solution to improve the microscopic roughness of the old concrete surface, but the acid etching method will produce acid pollution, and some acid etching solutions contain chlorides, which will corrode the steel bars
Xu Ouming and others reported that the use of exposed stone bridge decks can significantly improve the stability of bridge deck pavement in the title "Study on Improving the Stability of Bridge Deck Pavement Structure with Exposed Stone Concrete" (Journal of Wuhan University of Technology, 2010, No. 01, P22-24). Structural stability, but exposed concrete requires complex and strict construction techniques, so it is not widely used in actual engineering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] When the cement concrete pavement is poured in layers, self-compacting concrete is used, and 80kg / m of dry stones with a particle size of 5-10mm are evenly sprinkled on the surface of the self-compacting concrete immediately after pouring the concrete 3 , half sunk into the self-compacting concrete surface, no accumulation and no contact between the newly sprinkled stones, and then standard curing. The performance of the dry stone is based on weight percentage, mud content is less than 0.5%, mud block content is 0, needle flake content is less than 1%, firmness index is less than 5%, and organic matter content is qualified by colorimetric method.

[0012] When pouring the next layer, first clean the floating ash on the bonding surface of the old concrete, spray wet the bonding surface to remove the clear water on the surface of the bonding surface, and use a brush to dip in the commonly used concrete interface agent to evenly brush the surface of the bonding surface. Th...

Embodiment 2

[0014] When mass concrete is poured in layers, self-compacting concrete is used, and immediately after pouring the concrete, evenly sprinkle 120kg / m of dry stones with a particle size of 10-25mm on the surface of the self-compacting concrete 3 , half of the stones sink into the self-compacting concrete surface, there is no accumulation and no contact between the newly sprinkled stones, and then standard maintenance is carried out. The performance of the dry stone is based on weight percentage, the mud content is less than 0.5%, the mud block content is 0, the needle flake content is less than 1%, the firmness index is less than 5%, and the organic matter content is qualified by the colorimetric method.

[0015] When pouring the next layer, first clean the floating ash on the bonding surface of the old concrete, spray wet the bonding surface to remove the clear water on the surface of the bonding surface, and use a brush to dip in the commonly used concrete interface agent to ev...

Embodiment 3

[0017] Prepare the bridge deck first, use self-compacting concrete, and sprinkle 120kg / m dry stones with a particle size of 10-25mm on the surface of the self-compacting concrete immediately after pouring the concrete 3 , and then sprinkle 30kg / m of dry stones with a particle size of 5-10mm 3 , half of the stones sink into the self-compacting concrete surface, there is no accumulation and no contact between the newly sprinkled stones, and then standard maintenance is carried out. The performance of the dry stone is based on weight percentage, the mud content is less than 0.5%, the mud block content is 0, the needle flake content is less than 1%, the firmness index is less than 5%, and the organic matter content is qualified by the colorimetric method.

[0018] When paving the bridge deck, first clean the floating ash on the old concrete bonding surface, spray wet the bonding surface to remove the clear water on the bonding surface surface, and use a brush to dip in the commonl...

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Abstract

The invention discloses a treatment method for the bonding surface of fresh and old concrete. The method mainly comprises the following steps of uniformly spreading 80 to 150 kilograms dry gravels with particle sizes of 5 to 25mm into the surface of every cubic meter of self-compacting concrete instantly after the concrete is poured when the self-compacting concrete is produced, and performing standard maintenance on the self-compacting concrete, wherein the dry gravels are preferably spread in a way that a half of the gravels are sunken into the surface of the self-compacting concrete, the newly-spread gravels are free of deposition and contact; when fresh concrete is required to be poured, cleaning floating dust on the bonding surface of the old concrete at first, performing spraying wetting treatment on the bonding surface, removing explicit water on the surface of the bonding surface, dipping a brush in a common concrete interface agent, uniformly coating the surface of the bonding surface with the common concrete interface agent, and instantly pouring the fresh concrete; performing standard maintenance on the newly-poured concrete. According to the method, a later dabbing process of the surface of the old concrete can be reduced, damage to the surface of the old concrete can be avoided, the bonding performance of a concrete interface can be improved, and the construction progress can be accelerated.

Description

technical field [0001] The invention belongs to the technical field of concrete, in particular to a bonding method for new and old concrete. Background technique [0002] At present, the interface between the bridge deck pavement and the bridge deck is often damaged due to the poor bonding quality of the new and old concrete interface and the low shear force, which causes the bridge deck pavement to be damaged by interlayer movement. The roughness of the bonding surface of new and old concrete is one of the important factors affecting the bonding quality of new and old concrete. Researchers at home and abroad have done a lot of research on the treatment methods of new and old concrete bonding surfaces. Murray MA. et al reported in the title "Surface preparation for adhesives" (Concrete International 1989, No. 11, P69-71) that the high-pressure water jet technology was used to treat the new and old concrete bonding surfaces, with high work efficiency and remarkable results. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/12E01D22/00
Inventor 赵庆新丁小平邱月徐秋实张建勋高岱恒
Owner 秦皇岛市政建材集团有限公司
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