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Self-compacting concrete for CRTS III plate-type ballastless track filling layer and preparation method for self-compacting concrete

A technology of self-compacting concrete and slab-type ballastless track, which is applied in the field of building materials, can solve the problems of improving the fluidity of self-compacting concrete, maintaining time-volume stability of fluidity, shrinkage rate, durability and fine aggregate source, The long-term stability of the retention time and volume is not obvious, and the rheological properties of self-compacting concrete are changed to achieve strong internal bubble stability, small thixotropic changes over time, and improved various properties.

Inactive Publication Date: 2016-03-30
CHINA TIESIJU CIVIL ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation and application of self-compacting concrete for CRTS III-type slab filling layer has been reported internationally. Chinese patent CN102390967A discloses a self-compacting concrete for high-speed railway III-type slab ballastless track and its preparation method. Ordinary water reducer is a self-compacting concrete modified admixture, which plays a certain role in solving the problem of self-compacting concrete laitance foam layer, but it can change the rheological characteristics of self-compacting concrete, improve the fluidity of self-compacting concrete, maintain time and volume The time stability effect is not obvious, and the preparation method of self-compacting concrete is too complicated, the energy consumption is large, and the performance of the obtained concrete still has great technical limitations
Chinese patent CN102503309B discloses a method for preparing self-compacting concrete for railway slab ballastless track. The use of rheological additives has a certain effect on regulating the rheological properties of self-compacting concrete, but does not mention improving the fluidity of self-compacting concrete. , fluidity retention time, volume stability, shrinkage, durability, and source of fine aggregate

Method used

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  • Self-compacting concrete for CRTS III plate-type ballastless track filling layer and preparation method for self-compacting concrete
  • Self-compacting concrete for CRTS III plate-type ballastless track filling layer and preparation method for self-compacting concrete
  • Self-compacting concrete for CRTS III plate-type ballastless track filling layer and preparation method for self-compacting concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The fine aggregate is river sand with a fineness modulus of 2.6, the viscosity-modified material is a special viscosity-modified material, and the water-reducer is a special slow-release and controllable polycarboxylate water-reducer, which is used for the filling layer of CRTSⅢ plate ballastless track The proportion of self-compacting concrete is listed in Table 5.

[0049] Table 5 Proportion of self-compacting concrete for ballastless track filling layer (unit: kg / m 3 )

[0050]

[0051] The ballastless track filling layer mixed with the ratio of Example 1 was transported to the site with self-compacting concrete. When the mixing water was added 150 minutes ago, the performance of the concrete was tested to meet the requirements of pouring construction. The filling layer pouring construction took 9 minutes. The slab time consumption is normal, and the peeling test shows that the performance of the self-compacting concrete is good, and the quality of the filling la...

Embodiment 2

[0055] The fine aggregate is artificial machine-made sand with a fineness modulus of 2.5, the viscosity-modified material is a special viscosity-modified material, the water reducer is a special slow-release and controllable polycarboxylate water reducer, and the CRTSⅢ plate ballastless track filling layer The proportion of self-compacting concrete is shown in Table 7.

[0056] Table 7 Proportion of self-compacting concrete for ballastless track filling layer (unit: kg / m 3 )

[0057]

[0058] The ballastless track filling layer mixed with the ratio of Example 2 was transported to the site with self-compacting concrete. When the mixing water was added 150 minutes ago, the performance of the concrete was tested to meet the requirements of pouring construction, and the pouring construction of the filling layer took 9.5 minutes. The filling time is normal, and the peeling test shows that the performance of the self-compacting concrete is good, and the quality of the filling la...

Embodiment 3

[0063] The fine aggregate is modified sea sand with a fineness modulus of 2.4, the viscosity modified material is a special viscosity modified material, the water reducer is a special slow-release and controllable polycarboxylate water reducer, and the CRTSⅢ plate ballastless track filling The ratio of self-compacting concrete for the layer is shown in Table 9.

[0064] Table 9 Proportion of self-compacting concrete for ballastless track filling layer (unit: kg / m 3 )

[0065]

[0066] The ballastless track filling layer mixed in Example 3 was transported to the site with self-compacting concrete. When the mixing water was added 150 minutes ago, the performance of the concrete was tested to meet the pouring construction requirements, and the filling layer pouring construction took 8.5 minutes. The filling time is normal, and the peeling test shows that the performance of the self-compacting concrete is good, and the quality of the filling layer is good. The performance of t...

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Abstract

The present invention discloses a self-compacting concrete for CRTS III plate-type ballastless track filling layer. The concrete is prepared from the following raw materials in parts by weight: 270-350 parts of cement, 0-130 parts of coal fly ash, 0-120 parts of mineral powder, 20-50 parts of an expanding agent, 790-900 parts of fine aggregate, 750-900 parts of continuous gradation coarse aggregate, 20-40 parts specific viscosity modified materials, 5.5-8.5 parts of a specific sustained release controllable polycarboxylic acid water reducing agent and 165-180 parts of water. According to the invention, the specific viscosity modified materials and specific sustained release controllable polycarboxylic acid water reducing agent are used in combination to prepare the specific self-compacting concrete for filling layer with good flowability, strong volume stability, low sensitivity for water consumption, small thixotropic time change, low shrinkage and good longevity, thereby reducing theconstruction difficulty of the CRTS III plate-type filling layer and prolonging the sevice life of the ballastless track structure.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a self-compacting concrete for filling layers of CRTS III slab ballastless tracks and a preparation method thereof. Background technique [0002] The structure form of CRTSⅢ slab ballastless track is a new type of ballastless track structure independently designed and completed by Chinese scientific research and design personnel through multiple core technological innovations. China has completely independent intellectual property rights for it. The design purpose of the CRTSⅢ slab ballastless track structure is to overcome the outstanding defects in the construction, operation and maintenance of the CRTSI and CRTSII slab ballastless track structures, and to achieve convenient construction of the ballastless track structure, environmentally friendly materials, long structural life and Ease of maintenance and other goals. [0003] One of the core technologies of the CR...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B24/38
Inventor 陈钱宝黄海陈雷汪志勇黄玉华
Owner CHINA TIESIJU CIVIL ENG GRP CO LTD
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