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Method for recycling damaged cement concrete pavement to form road base

A technology of cement concrete and road base, applied in the direction of cement production, etc., to achieve the effect of reducing use and reducing environmental pollution

Active Publication Date: 2017-10-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for regenerating the damaged cement concrete pavement to form the road base, which can solve the problem of waste concrete produced by the damaged cement concrete pavement, and realize the recycling and recycling of resources

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  • Method for recycling damaged cement concrete pavement to form road base
  • Method for recycling damaged cement concrete pavement to form road base
  • Method for recycling damaged cement concrete pavement to form road base

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preparation example Construction

[0021] The concrete preparation method of cementitious material comprises the steps:

[0022] (21) Dissolve NaOH solid particles in purified water, stir until completely dissolved, and let stand to cool to room temperature;

[0023] (22) add water glass solution in the NaOH solution of cooling, stir;

[0024] (23) Slowly add the solution obtained in step (22) into the mixture of waste concrete powder and fly ash, and fully stir until uniform to ensure that silicon, aluminum, and calcium are fully dissolved.

[0025] The gradation of recycled aggregates is specifically: the content of recycled aggregates with a particle size less than 31.5mm is 100%; the content with a particle size between 19-31.5mm is 14%-32%; the particle size is between 9.5-19mm 28%-30%; the particle size between 4.75-9.5mm is 16%-26%; the particle size is 4%-6% between 2.36-4.75mm; the particle size is 0.6-2.36 The content between mm is 8%-13%; the content of particle size between 0.075-0.6mm is 8%-12%; ...

Embodiment 1

[0051]Using the waste concrete produced by a damaged cement concrete pavement as raw materials, coarse and fine aggregates and waste concrete powder are obtained by screening, and the waste concrete powder is ground and screened to obtain the part with a particle size of less than 0.075mm. Waste concrete powder and fly ash are used as main raw materials, sodium hydroxide solution and water glass are used as alkali activators to prepare geopolymer cementitious materials, and the specific mixing ratio of each component is waste concrete powder: fly ash=70 : 30, NaOH solution concentration=18mol / L, water glass modulus is 1.5.

[0052] According to the unconfined compressive strength, the 7-day unconfined compressive strength of the geopolymer cementitious material is as high as 41.5Mpa.

[0053] Table 2 Semi-rigid base aggregate gradation

[0054]

[0055] The amount of geopolymer cementitious material in the semi-rigid base material is 5.5%, and the samples are tested for un...

Embodiment 2

[0069] Using the waste concrete produced by a damaged cement concrete pavement as raw materials, coarse and fine aggregates and waste concrete powder are obtained by screening, and the waste concrete powder is ground and screened to obtain the part with a particle size of less than 0.075mm. Using waste concrete powder and fly ash as main raw materials, sodium hydroxide solution and water glass as alkali activator to prepare geopolymer cementitious material, the mixing ratio is waste concrete powder: fly ash = 60: 40, NaOH Solution concentration=18mol / L, water glass modulus is taken as 2.0.

[0070] According to the unconfined compressive strength, the 7-day unconfined compressive strength of the geopolymer cementitious material is as high as 30.2Mpa.

[0071] Table 7 Semi-rigid base aggregate gradation

[0072]

[0073] The amount of geopolymer cementitious material in the semi-rigid base material is 5.5%, and the samples are tested for unconfined compressive strength, spl...

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Abstract

The invention discloses a method for recycling a damaged cement concrete pavement to form a road base. The method comprises the following steps: crushing the damaged cement concrete pavement to obtain recyclable aggregates; (2) sieving the recyclable aggregates to obtain waste concrete powder and recyclable big and small aggregates; and then preparing a gel material through the waste concrete powder; and (3) mixing the obtained gel material and the recyclable big and small aggregates to prepare the recyclable concrete; and preparing the base of the damaged concrete pavement with the recyclable concrete according to related standards. The method has the beneficial effects that the problem of recycling waste concrete produced by the damaged cement concrete pavement can be solved; natural stone and cement are decreased to use; and the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of regeneration pavement construction, in particular to a method for regenerating a damaged cement concrete pavement to form a road base. Background technique [0002] With the rapid development of road construction in our country, a certain proportion of cement concrete pavement built in the early stage of our country needs to be repaired and maintained to varying degrees, and some road sections need to be overhauled or reconstructed due to serious damage. The current common practice is to remove the damaged pavement, repair the pavement base, and then re-pave the pavement, while the demolished waste concrete is often directly discarded as garbage. The design service life of cement concrete pavement usually does not exceed 15 years. According to the survey, for every 100 kilometers of cement concrete pavement, 2% of the cement concrete panels have been replaced within 10 years of completion and opening to t...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B28/00
CPCC04B7/243C04B12/005C04B28/006C04B2111/0075C04B2201/50C04B18/167C04B20/0076Y02P40/10
Inventor 朱志铎顾素恩唐震
Owner SOUTHEAST UNIV
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