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Special modified material for self-compacting concrete of plate-type ballastless track packing layer of high-speed railway

A slab ballastless track and self-compacting concrete technology, which is applied in the field of new concrete materials in construction projects, can solve problems such as air bubbles, affecting interface bond strength, and surface laitance, so as to improve fluidity and bond Strength, effect of increasing dispersion performance

Active Publication Date: 2013-04-17
CHINA RAILWAY NO 5 ENG GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problem that the self-compacting concrete existing in the self-compacting concrete preparation and construction of the high-speed railway slab ballastless track filling layer is prone to segregation, bleeding and surface laitance, and the interface between the track slab and the concrete filling layer Bubbles and soft layers appear on the surface, affecting the interface bond strength

Method used

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  • Special modified material for self-compacting concrete of plate-type ballastless track packing layer of high-speed railway
  • Special modified material for self-compacting concrete of plate-type ballastless track packing layer of high-speed railway
  • Special modified material for self-compacting concrete of plate-type ballastless track packing layer of high-speed railway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 1% of hydroxypropyl methylcellulose with a molecular weight of 200,000, 1% of polyvinyl acetate redispersible latex powder, 20% of magnesium aluminum silicate, 25% of calcium carbonate stone powder, and 53% of primary fly ash. The various component materials are uniformly mixed in proportion to obtain a modified material prepared according to the technical scheme proposed by the present invention.

[0025] Prepare self-compacting concrete according to the mix ratio in Table 1: unit: kg / cubic meter

[0026]

[0027]

Embodiment 2

[0029] Take 1.5% of hydroxypropyl methylcellulose with a molecular weight of 200,000, 1.5% of polyvinyl acetate redispersible latex powder, 10% of magnesium aluminum silicate, 25% of calcium carbonate stone powder, and 62% of primary fly ash. The various component materials are uniformly mixed in proportion to obtain a modified material prepared according to the technical scheme proposed by the present invention.

[0030] Self-compacting concrete is still prepared according to the mix ratio in Table 1.

[0031]

Embodiment 3

[0033] Take 1.5% of hydroxypropyl methylcellulose with a molecular weight of 200,000, 1.5% of polyvinyl acetate redispersible latex powder, 25% of calcium carbonate stone powder, and 53% of primary fly ash. The various component materials are uniformly mixed in proportion to obtain a modified material prepared according to the technical scheme proposed by the present invention.

[0034] Self-compacting concrete is still prepared according to the mix ratio in Table 1.

[0035]

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Abstract

The invention discloses a special modified material for self-compacting concrete of a plate-type ballastless track packing layer of a high-speed railway. The special modified material is formed by mixing the following components in percentage by weight: 40%-70% of coal ash, 20%-30% of calcium carbonate powder, 0%-10% of re-dispersible latex powder, 0%-10% of hydroxypropyl methylcellulose and 0%-30% of magnesium aluminum silicate. The invention provides the special modified material which can be applied to fillingself-compacting concrete to sealed space. The special modified material disclosed by the invention can be used for solving the problems such as segregation, bleeding, surface laitance and the like of the self-compacting concrete on the condition of not changing the construction performances of the self-compacting concrete. More importantly, a problem that a weak connecting layer is formed on the surface of the hardened filling layer concrete can be solved; bonding strength of the filling layer and the upper track board is ensured; and the structural durability is improved.

Description

technical field [0001] The invention relates to a special modified material for self-compacting concrete of a ballastless track of a high-speed railway, and belongs to the technical field of new concrete materials in construction engineering. Background technique [0002] The high-speed railway slab ballastless track structure is divided into six parts from top to bottom: steel rail, backing plate, track slab, filling layer, isolation layer and base plate. Among these six parts, the filling layer structure plays a crucial role and is also the most technically difficult part in the construction of slab ballastless track. The filling layer belongs to the post-construction structure, but it is required to form an overall composite structure with the track slab of the upper layer which belongs to the prefabricated reinforced concrete structure, and jointly play the role of bearing and force transmission. The deformation of track slabs and turnout slabs of reinforced concrete st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B24/26C04B22/10
Inventor 凌帆陈跃龙伊绣臻朱永清
Owner CHINA RAILWAY NO 5 ENG GRP
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