Preparation and application of dry-mixed mortar for plate-type ballastless track self-compacting concrete

A self-compacting concrete and slab-type ballastless track technology, which is applied in clay preparation equipment, cement mixing equipment, chemical instruments and methods, etc., can solve the problems of uncontrollable working performance of the mixture, sensitivity to the moisture content of fine aggregate, and fluctuations in the quality of raw materials and other issues, to achieve the effects of green construction, reduction of surface laitance layer, and simple manufacturing process

Active Publication Date: 2015-03-11
RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the problems of high loss in the construction process of self-compacting concrete for slab-type ballastless track and uncontrollable working performance of the mixture, the invention creatively adopts the measure of adding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The raw materials of dry powder mortar are weighed according to the following proportions:

[0031] Ordinary cement: 100 parts

[0032] Fly ash: 60 parts

[0033] Ground slag powder: 40 parts

[0034] Fine aggregate: 320 parts

[0035] Water-reducing and slump-preserving components: 3 parts

[0036] Bulking component: 10 parts

[0037] Viscosity adjustment component: 10 parts

[0038] Fiber: 0.4 parts

[0039] First, put the components weighed according to the mixing ratio into a high-speed mixer and stir at high speed for 8 minutes, then pack them in bulk trucks or ton bags, and transport them to the construction site. At the construction site, weigh the dry powder mortar according to the proportion and pour it into the mixer, then weigh 5-16mm continuous graded gravel with 25% of the dry powder mortar mass, pour it into the mixer, and dry mix it for 1 minute; weigh the dry powder mortar 0.12 % water, add water to the mixer while mixing the dry powder mortar and a...

Embodiment 2

[0042] The raw materials of dry powder mortar are weighed according to the following proportions:

[0043] Superfine cement: 100 parts

[0044] Fly ash: 100 parts

[0045] Modified silica fume: 10 parts

[0046] Fine aggregate: 350 parts

[0047] Water-reducing and slump-preserving components: 1.2 parts

[0048] Bulking component: 15 parts

[0049] Viscosity adjustment components: 6 parts

[0050] Fiber: 0.2 parts

[0051] First, put the components weighed according to the mixing ratio into a high-speed mixer and stir at high speed for 8 minutes, then pack them in bulk trucks or ton bags, and transport them to the construction site. At the construction site, weigh the dry powder mortar according to the proportion and pour it into the mixer, then weigh 5-16mm continuous graded gravel with 25% of the dry powder mortar mass, pour it into the mixer, and dry mix it for 1 minute; weigh the dry powder mortar 0.12 % water, add water to the mixer while mixing the dry powder mort...

Embodiment 3

[0054] The raw materials of dry powder mortar are weighed according to the following proportions:

[0055] Ordinary Portland cement: 100 parts

[0056] Fly ash: 100 parts

[0057] Metakaolin: 15 parts

[0058] Fine aggregate: 400 parts

[0059] Water-reducing and slump-preserving components: 0.3 parts

[0060] Bulking component: 6 parts

[0061] Viscosity adjustment component: 2 parts

[0062] First, put the components weighed according to the mixing ratio into a high-speed mixer and stir at high speed for 8 minutes, then pack them in bulk trucks or ton bags, and transport them to the construction site. At the construction site, weigh the dry powder mortar according to the proportion and pour it into the mixer, then weigh 5-16mm continuous graded gravel with 25% of the dry powder mortar mass, pour it into the mixer, and dry mix it for 1 minute; weigh the dry powder mortar 0.12 % water, add water to the mixer while mixing the dry powder mortar and aggregate, and then mix ...

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PUM

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Abstract

The invention relates to preparation and application of dry-mixed mortar for plate-type ballastless track self-compacting concrete. The dry-mixed mortar is prepared by mixing cement, a mineral additive, fine aggregate, a water-reducing and collapse-preventing component, an expanding component, a viscosity adjusting component and fiber according to a certain ratio, wherein 100 parts of cement, 50-120 parts of the mineral additive, 150-400 parts of the fine aggregate, 0.2-3 parts of the water-reducing and collapse-preventing component, 5-20 parts of the expanding component, 1-10 parts of the viscosity adjusting component and 0-0.5 part of the fiber are included. The invention further provides preparation and application of the dry-mixed mortar. The dry-mixed mortar is prepared by a high-speed mixer in a factory; the dry-mixed mortar is transported by a bulk truck or by an automobile in a bagged way; the dry-mixed mortar, coarse aggregate and water are weighed on a construction site in parts by weight and uniformly stirred for use. According to the technical scheme, the sensitivity of the self-compacting concrete to quality fluctuation of the raw materials can be greatly reduced and the loss of the self-compacting concrete can be significantly reduced; the dry-mixed mortar is suitable for a plate-type ballastless track of a high-speed railway, and can also be applied to bridges, civil buildings and the repairing and strengthening field.

Description

Technical field: [0001] The invention belongs to the field of building materials, and specifically relates to the preparation and application of a dry powder mortar for self-compacting concrete of a slab ballastless track with high stability, low loss, and environmental protection, and is suitable for the closed mold cavity structure of a slab ballastless track of a high-speed railway and other structures . Background technique: [0002] Realizing the self-filling and self-compacting functions of structures with the intelligent power of concrete materials is a major technological revolution that uses material properties to solve structural durability problems caused by construction factors. As a typical representative of intelligent dynamic concrete, self-compacting concrete has been applied to the CRTS III slab ballastless track structure with my country's independent intellectual property rights because of its high constructability, technical economy and environmental frie...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B28/04B28C5/00
Inventor 李化建谭盐宾易忠来谢永江李林香程冠之
Owner RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI
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