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High-speed rail ballastless track self-compacting concrete based on cementing material and preparation method

A self-compacting concrete and cementitious material technology, applied in the field of self-compacting concrete for high-speed rail ballastless track, can solve the problems of poor fluidity, easy segregation and bleeding, etc., and achieve reduced apparent density, low micro-expansion, and easy operation Effect

Inactive Publication Date: 2020-11-03
祎禾科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-compacting concrete part of the prior art has poor fluidity and is prone to problems such as segregation and bleeding.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 10 parts of P.O42.5 ordinary Portland cement, 20 parts of cementitious material, 20 parts of shale pottery sand, 30 parts of gravel, 1 part of fly ash, 0.02 parts of naphthalene-based water reducer, sulfur aluminum 0.3 parts of calcium acid expansion agent and appropriate amount of water; when preparing, (1) mix 20 parts of shale pottery sand, 30 parts of crushed stone, and 20 parts of cementitious material; (2) mix 10 parts of ordinary portland cement , 1 part of fly ash mixed uniformly; (3) adding the uniformly mixed material in the step (2) to the uniformly mixed material in the step (1), and then mixing uniformly to obtain the admixture; (4 ) dissolving 0.02 parts of naphthalene-based water reducer and 0.3 parts of calcium sulfoaluminate expansion agent in an appropriate amount of water to obtain an aqueous solution of the additive; (5) adding the aqueous solution of the additive in the step (4) to The mixture is uniformly stirred to obtain self-compacting con...

Embodiment 2

[0039] Weigh 20 parts of P·O42.5 ordinary Portland cement, 10 parts of cementitious material, 30 parts of shale pottery sand, 10 parts of crushed stone, 5 parts of fly ash, 0.03 parts of naphthalene-based water reducer, sulfur aluminum 1.2 parts of calcium acid expansion agent and appropriate amount of water; when preparing, (1) mix 30 parts of shale pottery sand, 10 parts of crushed stone, and 10 parts of cementitious material; (2) mix 20 parts of ordinary Portland cement , and 5 parts of fly ash are mixed uniformly; (3) the uniformly mixed material in the step (2) is added to the uniformly mixed material in the step (1), and then mixed uniformly to obtain the mixture; (4 ) dissolving 0.03 parts of naphthalene-based water reducer and 1.2 parts of calcium sulfoaluminate expansion agent in an appropriate amount of water to obtain an aqueous solution of the additive; (5) adding the aqueous solution of the additive in the step (4) to The mixture is uniformly stirred to obtain sel...

Embodiment 3

[0042] Weigh 15 parts of P.O42.5 ordinary Portland cement, 15 parts of cementitious material, 25 parts of shale pottery sand, 20 parts of gravel, 3 parts of fly ash, 0.02 parts of naphthalene-based water reducer, sulfur aluminum 0.8 parts of calcium acid expansion agent and appropriate amount of water; when preparing, (1) mix 25 parts of shale pottery sand, 20 parts of crushed stone, and 15 parts of cementitious material; (2) mix 15 parts of ordinary Portland cement , 3 parts of fly ash are mixed uniformly; (3) the material mixed uniformly in the step (2) is added to the material mixed uniformly in the step (1), and then mixed uniformly to obtain the mixture; (4 ) dissolving 0.02 parts of naphthalene-based water reducer and 0.8 parts of calcium sulfoaluminate expansion agent in an appropriate amount of water to obtain an aqueous solution of the additive; (5) adding the aqueous solution of the additive in the step (4) to The mixture is uniformly stirred to obtain self-compactin...

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Abstract

The invention discloses high-speed rail ballastless track self-compacting concrete based on a cementing material and a preparation method, and belongs to the technical field of self-compacting concrete. The self-compacting concrete for the ballastless track of the high-speed rail is prepared from cement, a cementing material, fine aggregate, coarse aggregate, fly ash, an additive and a proper amount of water. According to the formula of the self-compacting concrete, the cementing material prepared by taking the floating beads and the quartz sand as raw materials through high-temperature melting, water quenching and grinding is added, and the cementing material has relatively large specific surface area and activity, so the viscosity between the cementing material and other mixtures is increased, the interface structure is improved, and the compactness is increased; in other words, the friction force between the cementing material and the mixture is increased equivalently, so the lightweight aggregate can be effectively prevented from floating upwards, and the problems of segregation and bleeding when the lightweight aggregate is used in the self-compacting concrete in the prior artare solved.

Description

technical field [0001] The invention relates to the technical field of self-compacting concrete for high-speed rail ballastless tracks, in particular to a self-compacting concrete for high-speed rail ballastless tracks based on cementitious materials and a preparation method thereof. Background technique [0002] Ballastless track is a ballastless track bed technology often used in railway bridges, tunnels and roadbeds. Its structure mainly includes steel rails, elastic constant resistance fasteners, track slabs, self-compacting concrete layers, isolation layers, elastic cushion layers, base plates, etc. composition. [0003] At present, the commonly used track slabs in my country are P5600, P4925 and P4856. The thickness of self-compacting concrete is generally 9cm. The space is narrow, and it cannot be compacted by conventional methods, and it can reach a compact state through self-flowing, [0004] Self-compacting concrete means that under the action of its own gravity, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/144C04B2111/0075C04B2201/50C04B7/02C04B18/027C04B14/02C04B18/08C04B14/06C04B22/14C04B2103/302
Inventor 刘琰李屹张杰许博李梅吉
Owner 祎禾科技有限公司
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