Self-compacting concrete for road engineering

A technology for self-compacting concrete and road engineering, applied in the field of civil engineering materials, can solve the problems of reduced durability of self-compacting concrete, adverse effects on concrete volume stability, and high strength, and achieves the effect of improving thixotropy

Inactive Publication Date: 2016-10-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing self-compacting concrete has a relatively small water gel ratio and generally high strength; in order to increase the fluidity of self-compacting concrete, a large amount of cementitious materials are used, resulting in a large slurry content, causing a large shrinkage of the concrete volume, and affecting the volume stability of the concrete. At the same time, the use of a large amount of mineral admixtures may also reduce the durability of self-compacting concrete to a certain extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Self-compacting concrete includes the following components: 150 parts of P.O 42.5 cement, 100 parts of fly ash, 300 parts of crushed stone with a particle size of 5-10mm, 300 parts of crushed stone with a particle size of 10-15mm, 200 parts of crushed stone with a particle size of 15-20mm, 500 parts of natural sand, 100 parts of water, 1 part of a mixture of shrinkage-reducing polycarboxylate superplasticizer and naphthalene-based superplasticizer, 10 parts of nano-bentonite, 0.1 part of a copolymer of rosin and maleic acid-polyethylene glycol monoester , 0.2 parts of rosin soap, 0.1 part of tackifier, and 0.3 part of calcium stearate. The mass ratio of the shrinkage-reducing polycarboxylate water-reducer to the naphthalene-based water-reducer in the mixture of the shrink-reducing polycarboxylate water-reducer and the naphthalene-based water-reducer is 1:3. 50 parts of chemical air-generating agent, of which chemical hair-forming agent The air agent is aluminum powder. ...

Embodiment 2

[0022] Self-compacting concrete includes the following components: 150 parts of P.O 42.5 cement, 30 parts of finely ground slag powder, 30 parts of recycled micropowder, 200 parts of crushed stone with a particle size of 5-10mm, 200 parts of crushed stone with a particle size of 10-15mm, 15- 400 parts of 20mm gravel, 200 parts of machine-made sand, 650 parts of natural sand, 165 parts of water, 1.6 parts of a mixture of shrinkage-reducing polycarboxylate superplasticizer and naphthalene-based superplasticizer, 10 parts of nano-bentonite, sodium lauryl sulfate 0.4 part, 0.2 part of tackifier, 1 part of calcium stearate. The mass ratio of shrinkage-reducing polycarboxylate water-reducer and naphthalene-based water-reducer in the mixture of shrinkage-reducing polycarboxylate water-reducer and naphthalene-based water-reducer is 1:3.5. 60 parts of chemical air-generating agent, of which chemical hair The air agent is aluminum powder.

[0023] In a specific embodiment of the presen...

Embodiment 3

[0025] Self-compacting concrete includes the following components: use 100 parts of P.O 52.5 cement, 150 parts of ground slag powder, 20 parts of silica fume, 400 parts of crushed stone with a particle size of 5-10mm, 200 parts of crushed stone with a particle size of 10-15mm, 15- 200 parts of 20mm gravel, 750 parts of natural sand, 160 parts of water, 1.3 parts of a mixture of shrinkage-reducing polycarboxylate superplasticizer and naphthalene-based superplasticizer, 20 parts of nano-bentonite, 0.5 parts of rosin soap, 0.3 parts of tackifier, 1 part of calcium stearate. The mass ratio of shrinkage-reducing polycarboxylate water-reducer to naphthalene-based water-reducer in the mixture of shrinkage-reducing polycarboxylate water-reducer and naphthalene-based water-reducer is 1:4. 70 parts of chemical air-generating agent, of which chemical hair The aerosol is hydrogen peroxide solution.

[0026] In a specific embodiment of the present invention, a stirring device is used to d...

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Abstract

The invention discloses self-compacting concrete for road engineering. The self-compacting concrete has a porous structure, and the gas content of the concrete is 15-20%. By introducing massive bubbles to self-compacting concrete slurry, consumption of a medium-and-low-strength self-compacting concrete cementitious material and hydration heat are effectively reduced, and the thixotropy, volume stability and microstructure of the concrete are improved. The strength grade of the medium-and-low-strength self-compacting concrete is C10-C50, slump flow can be adjusted within the range of 600-850 mm according to operating requirements, the difference between slump flow and J ring flow is smaller than 20 mm, and separation ratio is smaller than 10%. The self-compacting concrete can be applied to constructional engineering, roadbed and levee crown road engineering, watercourse and channel construction and repair, and rock filling.

Description

technical field [0001] The invention belongs to the field of civil engineering materials and relates to self-compacting concrete used in road engineering. Background technique [0002] Self-compacting concrete is a high-performance concrete with the characteristics of high fluidity, high filling, and high segregation resistance. It is suitable for large-span, high-density steel bars and other occasions that are not suitable for manual mixing. Through the careful design of the mix ratio by selecting cementitious materials, coarse and fine aggregates and high-performance admixtures, the yield stress of the concrete is reduced enough to be overcome by the shear stress due to its own weight, so that the fluidity of the concrete increases without appearing Segregation and bleeding problems, can fully fill the space in the formwork, forming a dense and uniform gel structure. [0003] In order to meet its high fluidity requirements, self-compacting concrete often has the character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/04
CPCC04B28/04C04B2111/0075C04B2201/50C04B18/08C04B14/02C04B14/068C04B24/24C04B24/00C04B14/104C04B24/34C04B24/085C04B2103/44C04B22/04C04B38/02C04B18/141C04B18/04C04B14/06C04B24/16C04B14/04C04B22/068
Inventor 唐洪刚左晓宝蒋慷
Owner NANJING UNIV OF SCI & TECH
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