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A kind of unpowered transport self-compacting concrete and its application

A self-compacting concrete and power technology, applied in roads, tracks, buildings, etc., can solve the problems of special machine tool processing, high labor and equipment costs, difficult quality control, and high cost of cement emulsified asphalt mortar, to increase the anti-segregation ability, The effect of preventing stones from sinking and good anti-segregation performance

Active Publication Date: 2021-05-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, Ⅰ and Ⅱ mortars are made by special mixing machinery through a specific mixing process. The process is complicated and the quality is extremely difficult to control.
Furthermore, the cost of cement emulsified asphalt mortar is too high, about 10 times that of ordinary concrete, and the price of each mortar mixer truck is high, reaching several million yuan. The processing, labor and equipment costs of special machines and tools during construction (construction speed is only per 300 meters per day) are higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The self-compacting concrete for the slab ballastless track of the present embodiment is composed of cement, fly ash, mineral powder, microsilica fume (silica fume), diatomaceous earth, nano calcium carbonate powder, fine aggregate, coarse aggregate, expansion agent , water reducer, retarder, rheology additive, defoamer, and water are mixed and stirred. The parts by weight of each component are:

[0056] 100 parts of cement 30 parts of fly ash

[0057] 20 parts of mineral powder, 3 parts of silica fume

[0058] Diatomaceous earth 0.2 parts Nano calcium carbonate 0.05 parts

[0059] 265 parts of fine aggregate 275 parts of coarse aggregate

[0060] 10 parts of expansion agent, 2.8 parts of water reducer

[0061] 0.1 part of retarder, 0.02 part of rheological additive

[0062] 0.001 parts of defoamer 56 parts of water,

[0063] Wherein the specific surface area of ​​diatomaceous earth is 27000m 2 / kg, the average particle diameter of the nano-calcium carbonate powd...

Embodiment 2

[0067] The self-compacting concrete for the slab ballastless track of the present embodiment is composed of cement, fly ash, mineral powder, microsilica fume (silica fume), diatomaceous earth, nano calcium carbonate powder, fine aggregate, coarse aggregate, expansion agent , water reducer, retarder, rheology additive, defoamer, and water are mixed and stirred. The parts by weight of each component are:

[0068] 100 parts of cement, 35 parts of fly ash

[0069] 15 parts of mineral powder, 5 parts of silica fume

[0070] Diatomaceous earth 0.3 parts Nano calcium carbonate 0.03 parts

[0071] 260 parts of fine aggregate 280 parts of coarse aggregate

[0072] 12 parts of expansion agent, 2.7 parts of water reducer

[0073] 0.1 part of retarder, 0.02 part of rheological additive

[0074] 0.001 part of defoamer, 58 parts of water

[0075] Wherein the specific surface area of ​​diatomaceous earth is 25000m 2 / kg, the average particle diameter of the nano-calcium carbonate powd...

Embodiment 3

[0079] The self-compacting concrete for the slab ballastless track of this embodiment is cement, fly ash, mineral powder, microsilica fume, diatomaceous earth, nano calcium carbonate powder, fine aggregate, coarse aggregate, expansion agent, water reducer, It is made by mixing retarder, rheology additive, defoamer and water. The parts by weight of each component are:

[0080] 100 parts of cement, 35 parts of fly ash

[0081] 20 parts of mineral powder, 5 parts of silica fume

[0082] Diatomaceous earth 0.5 parts Nano calcium carbonate 0.05 parts

[0083] 260 parts of fine aggregate 280 parts of coarse aggregate

[0084] 12 parts of expansion agent, 3.4 parts of water reducer

[0085] 0.1 part of retarder, 0.02 part of rheological additive

[0086] 0.001 part of defoamer 56 parts of water

[0087] Wherein the diatomaceous earth specific surface area is 30000m 2 / kg, the average particle diameter of the nano-calcium carbonate powder is 50nm, and the specific surface area ...

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Abstract

The invention discloses a non-powered transport self-compacting concrete, which comprises the following components in parts by weight: cement: 80-120 parts, fly ash: 30-50 parts, mineral powder: 10-30 parts, micro silicon Powder: 2-5 parts, diatomite: 0.05-0.5 parts, nano calcium carbonate powder: 0.02-0.1 parts, fine aggregate: 200-300 parts, coarse aggregate: 250-350 parts, expansion agent: 10-25 parts , Water reducer: 1.0-3.5 parts, retarder: 0.1-1 part, rheological additive: 0.01-0.05 part, defoamer: 0.001-0.003 part, water: 50-80 parts. The freshly mixed self-compacting concrete does not need power to continue stirring during the transfer and construction process, and will not segregate and bleed due to transport and environmental vibrations, resulting in difficulty in pouring. It can be used in high-speed railways and subway slab ballastless track structures The filling material between the track plate and the bottom plate can also be used as the filling material between the turnout plate and the bottom plate in the turnout structure, especially suitable for the occasions where it is difficult to provide stirring during transportation such as tunnels and bridges, and long-distance transportation is required.

Description

technical field [0001] The invention relates to self-compacting concrete for non-powered transportation and its application, and belongs to the technical field of slab-type non-jaw track building materials. Background technique [0002] In recent years, rail transit represented by high-speed railways and subways has developed rapidly all over the world, especially in my country. As of March 2018, the operating mileage of high-speed railways in my country is 25,000 km, and the urban subway is 5,300 km , and according to the plan, by 2020, my country will build 30,000 km of high-speed railways and 3,000 km of new subways. In rail transit such as high-speed railways and subways, quite a few lines adopt slab-type ballastless track structures. Both require high smoothness, so a filling layer is designed for later leveling and error elimination. [0003] Cement emulsified asphalt mortar was first used as the filling material between the track slab and the bottom slab. One of its ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00E01B1/00
CPCC04B28/00C04B2111/0075E01B1/002E01B2204/09C04B18/08C04B18/141C04B14/02C04B14/062C04B14/28C04B2103/302C04B2103/50C04B2103/22C04B2103/0068C04B14/08
Inventor 曾晓辉谢友均龙广成马昆林马聪周华龙吴伟先
Owner CENT SOUTH UNIV