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Self-densifying concrete as well as preparation method and application thereof

A self-compacting concrete, selected technology, applied in the direction of roads, tracks, buildings, etc., can solve the problems of shrinkage of filling layer materials, achieve the effect of enhancing integrity, improving structural integrity and service life, and ensuring volume stability

Active Publication Date: 2012-07-18
METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, an object of the present invention is to overcome the existing self-compacting concrete pouring in the closed space of the filling layer under the ballastless track slab. Self-compacting concrete with better fill volume stability

Method used

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  • Self-densifying concrete as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] This example is used to illustrate the self-compacting concrete of the present invention and its preparation method.

[0042] The formula of the self-compacting concrete of the present embodiment is (by weight):

[0043] 100 parts of P·O 42.5 cement, 20 parts of fly ash, 150 parts of river sand with a fineness modulus of 2.4-3.1, 150 parts of gravel with a particle size of 5-16mm, and 20 parts of shale ceramsite with a particle size of 0.3-4.75mm part, 0.6 part of polyacrylamide resin, 5 parts of acrylic emulsion of commercial model Acronal 430 purchased from BASF, and the specific surface area of ​​ground steel slag powder is 400m 2 / kg, MgO content is 10%, 20 parts in total, 1 part of calcium oxide expansion agent, 1.2 parts of naphthalene-based water reducer, 60 parts of water and 0.005 parts of aluminum powder with a fineness of 100 mesh.

[0044] After weighing the above ingredients, transfer them to the blender and stir evenly for 30 seconds. The test is carried...

Embodiment 2

[0046] This example is used to illustrate the self-compacting concrete of the present invention and its preparation method.

[0047] The formula of the self-compacting concrete of the present embodiment is (in parts by weight):

[0048] 100 parts of P.O 52.5 cement, 40 parts of fly ash, 200 parts of river sand with a fineness modulus of 2.4-3.1, 250 parts of gravel with a particle size of 5-16mm, and 120 parts of fly ash ceramsite with a particle size of 0.3-4.75mm 0.1 part of polyacrylamide resin, 40 parts of styrene-acrylic emulsion of Acronal 400 purchased from BASF, and the specific surface area of ​​ground steel slag powder is 500m 2 / kg, MgO content is 10%, a total of 5 parts, U-type expansion agent 3 parts, sodium dodecylsulfonate air-entraining agent 0.01 part, melamine water reducer 1.2 parts, water 60 parts and fineness of 100 mesh aluminum Powder 0.005 parts.

[0049] After weighing the above-mentioned ingredients, transfer them to the blender, and stir evenly for...

Embodiment 3

[0051] This example is used to illustrate the self-compacting concrete of the present invention and its preparation method.

[0052] The formula of the self-compacting concrete of the present embodiment is (by weight):

[0053] 100 parts of P·II cement, 40 parts of fly ash, 250 parts of machine-made sand with a fineness modulus of 2.7, 300 parts of pebbles with a particle size of 5-16mm, 50 parts of shale ceramsite of 0.3-4.75mm, polyacrylamide resin 3 parts, 15 parts of styrene-butadiene latex of Styrofan 623 purchased from BASF, the specific surface area of ​​ground steel slag powder is 500m 2 / kg, MgO content is 8%, a total of 10 parts, 8 parts of aluminum calcium sulfate expansion agent, 0.05 parts of sodium dodecylbenzenesulfonate air-entraining agent, 1.2 parts of polycarboxylate water reducer, 50 parts of water, silicone disinfectant 0.02 parts of foaming agent and 0.002 parts of aluminum powder with a fineness of 120 mesh. After weighing the above-mentioned ingredien...

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Abstract

The invention provides self-densifying concrete, which is prepared from 100 parts by weight of cement, 20-100 parts by weight of coal ash, 20-120 parts by weight of porous fine aggregate, 150-250 parts by weight of non-porous fine aggregate, 150-300 parts by weight of coarse aggregate, 0.1-3 parts by weight of water-absorbing resin, 5-40 parts by weight of polymer emulsion, 1-12 parts by weight of expanding agent, 0.5-3 parts of water reducing agent, 10-90 parts by weight of water, 5-50 parts by weight of steel slag, 0-2 parts by weight of air entraining agent and 0-2 parts by weight of defoaming agent. The invention also provides a method for preparing the self-densifying concrete and the application of the self-densifying concrete in preparing a filling layer which is laid under plates of ballastless tracks.

Description

technical field [0001] The invention relates to a self-compacting concrete, in particular to a self-compacting concrete used for a filling layer of a slab ballastless track, as well as a preparation method and application of the concrete. Background technique [0002] With the gradual implementation of the high-speed railway network construction plan and the improvement of the level of science and technology, my country has successfully independently developed the CRTS III slab ballastless track structure, which has many advantages such as good integrity. [0003] The self-compacting concrete filling layer is a key component of the CRTS III slab ballastless track. On the one hand, it can fill the space under the slab and adjust the track construction error, and on the other hand, it can make the track have reasonable elasticity. The use plays a very important role in improving the safety of train running at high speed and the comfort of riding. In addition, compared with ce...

Claims

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Application Information

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IPC IPC(8): C04B28/04E01B2/00
Inventor 王涛李海燕邵丕彦刘子科吴韶亮李洪刚魏曌贾恒琼
Owner METALS & CHEM RES INST CHINA ACAD OF RAILWAY SCI
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