Composite waterproof layer for concrete bridge deck of railway ballast track and construction method of composite waterproof layer

A technology of concrete and waterproof layer, applied in coatings, bridges, bridge parts, etc., can solve the problems of water channeling, weak welding, and labor cost at the interface between the concrete bridge deck and the coil material, and achieve remarkable special environmental adaptability and durability. Aging performance, excellent physical and mechanical properties, the effect of improving durability

Active Publication Date: 2019-06-21
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +7
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the interface between the polymer modified bitumen waterproof membrane and the concrete bridge deck is weak, if there is local water seepage and the waterproof membrane is punctured, it is easy to cause water channeling between the concrete bridge deck and the membrane interface.
Moreover, it is easy to have weak welding at the overlap of two waterproof membranes, and water is easy to seep in.
At the same time, during the high temperature season in summer, the oil in the waterproof membrane is easy to be squeezed out after softening, thereby contaminating the bridge deck
In addition, in actual construction, heavy coils must be transported to the construction site in advance
This not only costs manpower, but also needs to prepare enough storage space for it at the construction site

Method used

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  • Composite waterproof layer for concrete bridge deck of railway ballast track and construction method of composite waterproof layer
  • Composite waterproof layer for concrete bridge deck of railway ballast track and construction method of composite waterproof layer
  • Composite waterproof layer for concrete bridge deck of railway ballast track and construction method of composite waterproof layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0043] Embodiment 1~6: a kind of polyurethane composition

[0044] The raw material composition of the polyurethane composition of Examples 1-6 is as shown in Table 1, prepared by the following method:

[0045] (1) Prepare the raw materials of component A and component B according to the mass ratio;

[0046] (2) Put the solvent and polyether polyol of component A in a container, add the filler under stirring at 100-140 rpm and stir for 5-10 minutes, then stir at 1000-1400 rpm After adding hydroxyethyl methacrylate, methyl methacrylate, isobutyl acrylate, N,N-dimethyl-p-toluidine and dibutyltin dilaurate, keep stirring and dispersing for 30-45 minutes at a constant speed, and then continue After adding graphene, fillers, anti-sedimentation additives, wetting and dispersing agents, defoamers, light stabilizers, and ultraviolet absorbers, continue to stir and disperse at high speed for 45-65 minutes, grind until the material fineness is below 50 μm, and discharge after filterin...

Embodiment 7

[0074] Embodiment 7 A kind of composite waterproof layer of railway ballasted track concrete bridge deck

[0075] The railway ballasted track concrete bridge deck composite waterproof layer described in this embodiment comprises from top to bottom: a concrete protection layer, a modified polyurethane paint layer and a sealing primer layer, wherein each layer is closely bonded to the adjacent layer combined; the construction is completed by the following methods:

[0076] (1) After the base surface of the concrete bridge deck is cleaned and dried, apply an epoxy sealing primer (produced by Langfang Santong Chemical Industry Co., Ltd.), and the consumption of the epoxy sealing primer is 0.2~0.4Kg / m 2 ;

[0077] (2) after coating described sealing primer 24h, on the sealing primer layer that forms, coat the polyurethane composition that prepares according to any embodiment in embodiment 1~6, make the modified polyurethane paint layer that forms dry Film thickness reaches 1.2-...

Embodiment 8

[0079] Example 8 Composite Waterproof Layer for Railway Ballasted Track Concrete Bridge Deck

[0080] The railway ballasted track concrete bridge deck composite waterproof layer described in this embodiment comprises from top to bottom: a concrete protection layer, a modified polyurethane paint layer and a sealing primer layer, wherein each layer is closely bonded to the adjacent layer combined; the construction is completed by the following methods:

[0081] (1) After the base surface of the concrete bridge deck is cleaned and dried, apply an epoxy sealing primer (produced by Langfang Santong Chemical Industry Co., Ltd.), and the consumption of the epoxy sealing primer is 0.2~0.4Kg / m 2 ;

[0082] (2) after coating described sealing primer 24h, on the sealing primer layer that forms, coat the polyurethane composition that prepares according to any embodiment in embodiment 1~6, make the modified polyurethane paint layer that forms dry Film thickness reaches 1.2-2.0mm;

[0...

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Abstract

The invention provides a composite waterproof layer for a concrete bridge deck of a railway ballast track and a construction method of the composite waterproof layer. The composite waterproof layer comprises a concrete protective layer, a modified polyurethane paint layer and a sealing primer layer from top to bottom; and the invention also provides a polyurethane composition for forming the modified polyurethane paint layer and a preparation method of the polyurethane composition. According to the invention, the waterproof layer is formed by directly spraying or roll-coating polymer materialson the concrete bridge deck, and then the concrete protective layer is laid, so that the structure not only can avoid an own defect that an existing waterproof coil material is weak in bonding with the concrete bridge deck and effectively reduce occurrence of water channeling, but also prevent hidden dangers brought by more overlapping parts in construction of waterproof coiled materials; therefore, the invention is of great significance in improving durability of railway concrete bridges.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and waterproofing, and in particular relates to a composite waterproofing layer for railway ballasted track concrete bridge decks and a construction method thereof. Background technique [0002] The deck waterproofing of railway bridges is a necessary structure to prolong the service life of bridges, reduce maintenance frequency and ensure traffic safety. At present, the ballasted railway concrete bridge deck is mainly waterproofed by high polymer modified asphalt waterproof membrane. However, the coiled material is relatively soft as a whole, and its resistance to ballast rolling and piercing is poor. During the construction, the concrete protection layer must be laid on the waterproof membrane, and then the road ballast should be laid. However, the interface between polymer modified asphalt waterproof membrane and concrete bridge deck is weak, if there is local water seepage and the ...

Claims

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Application Information

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IPC IPC(8): E01D19/08C09D175/04C09D7/61C08G18/63C08F283/06C08F220/20C08F220/14C08F220/18
Inventor 王涛祝和权杜存山南阳葛凯牛斌苏永华张喆高策周勇政王祯苏伟刘斌陈勇
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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