Special modifying agent for self-compacting concrete of high speed railway ballastless track

A ballastless track and high-speed railway technology is applied in the field of modifiers for self-filling concrete of high-speed railway ballastless tracks, which can solve the problems of self-filling concrete bleeding, laitance and large shrinkage and deformation, and achieves extended operation time, The effect of suppressing bleeding and improving interfacial bond strength

Active Publication Date: 2012-06-20
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve various problems existing in the preparation and construction of self-filling concrete for high-speed railway slab ballastless track filling layer structure, and to provide a special modifier for self-filling concrete, which can be used without changing the construction performance of self-filling concrete. Under the premise, solve the problems of self-filling concrete bleeding, segregation, laitance and large shrinkage deformation

Method used

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  • Special modifying agent for self-compacting concrete of high speed railway ballastless track
  • Special modifying agent for self-compacting concrete of high speed railway ballastless track
  • Special modifying agent for self-compacting concrete of high speed railway ballastless track

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Effect test

Embodiment 1

[0018] The materials of the present invention are obtained by mixing the components according to the following proportions: nano silicon dioxide: 20%, modified metakaolin: 35%, superfine slag powder: 20%, modified starch: 1%, latex powder: 2%, zeolite powder: 10%, polyamide polymer water-absorbing resin: 1%, magnesium oxide expansion agent: 11%.

[0019] The prepared self-filling concrete mix proportion of the present invention that adopts above-mentioned prescription to make is shown in Table 1:

[0020] Table 1 Mix ratio of self-filling concrete (kg / m 3 )

[0021]

[0022] The prepared self-filling concrete performance of the present invention that adopts above-mentioned prescription to make is shown in Table 2:

[0023] Table 2 Properties of self-filling concrete

[0024]

Embodiment 2

[0026] The material of the present invention is obtained by mixing the components according to the following proportions: nano silicon dioxide: 10%, modified metakaolin: 30%, superfine slag powder: 30%, modified starch: 3.5%, latex powder: 4%, zeolite powder: 10%, starch-based water-absorbing resin: 1%, sodium tripolyphosphate: 0.5%, magnesium oxide expansion agent: 6%, calcium oxide expansion agent: 5%.

[0027] The prepared self-filling concrete mix proportion of the present invention that adopts above-mentioned prescription to make is shown in Table 3:

[0028] Table 3 Mix ratio of self-filling concrete (kg / m 3 )

[0029]

[0030] The prepared self-filling concrete performance of the present invention that adopts above-mentioned prescription to make is shown in Table 4:

[0031] Table 4 Properties of self-filling concrete

[0032]

Embodiment 3

[0034] The material of the present invention is obtained by mixing the components according to the following proportions: nano silicon dioxide: 15%, modified metakaolin: 27%, superfine slag powder: 20%, modified starch: 3.5%, latex powder: 4%, zeolite powder: 12%, polyamide polymer water-absorbent resin: 1.5%, sodium gluconate: 1.0%, magnesium oxide expansion agent: 10%, calcium oxide expansion agent: 6%.

[0035] The self-filling concrete mix ratio prepared by the present invention that adopts above-mentioned formula to make is shown in Table 5:

[0036] Table 5 Mixing ratio of self-filling concrete (kg / m 3 )

[0037]

[0038] The prepared self-filling concrete performance of the present invention that adopts above-mentioned prescription to make is shown in Table 6:

[0039] Table 6 Performance of self-filling concrete

[0040]

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Abstract

The invention belongs to the technical field of concrete new material in traffic engineering, which particularly relates to a special modifying agent for self-compacting concrete of a high speed railway ballastless track. The special modifying agent is characterized in that the special modifying agent comprises the following components by proportion: 10 to 20 percent of nano silicon dioxide, 25 to 40 percent of modified metakaolin, 20 to 35 percent of ultrafine slag powder, 0.1 to 5 percent of thickening component, 1 to 10 percent of emulsion powder, 3 to 15 percent of zeolite powder, 1 to 3 percent of macromolecule water-absorbing resin, 0 to 1 percent of slow setting component and 10 to 20 percent of expansion component. The special modifying agent has the functions of improving workability and volume stability of self-compacting concrete, can improve the plastic viscosity of concrete mixture on the premise that the flowability of concrete is not reduced, inhibit bleeding and segregation, reduce the contraction distortion, and improve the crack resistance and the bonding strength of concrete.

Description

technical field [0001] The invention relates to a modifier for high-speed railway ballastless track self-filling concrete, which belongs to the technical field of new concrete materials in traffic engineering, and is suitable for self-filling concrete in high-speed railway CRTS Ⅱ type ballastless track switch area and CRTS Ⅲ ballastless track Self-filling concrete is used. Background technique [0002] The high-speed railway slab ballastless track structure can be divided into five parts from top to bottom: steel rail, track slab, filling layer, isolation layer and base plate. In the turnout area, the track slab is a turnout slab. Among the five parts of the structure, the filling layer structure not only plays a vital role, but also is the most difficult part of construction technology in each part of the structure. On the one hand, the filling layer structure is a post-construction structure, but it is required to form an integral composite structure with the upper track ...

Claims

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Application Information

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IPC IPC(8): C04B24/28C04B24/38
Inventor 李化建谭盐宾易忠来
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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