Chemical treatment method of recycled aggregate for asphalt concrete

A technology for asphalt concrete and chemical treatment, applied in the field of recycled aggregate for asphalt concrete, can solve the problems of inability to adhere to the mortar reaction, cannot realize chemical modification of the surface of recycled aggregate, etc. The effect of penetration

Active Publication Date: 2020-09-25
YANGZHOU UNIV
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Problems solved by technology

At present, chemical treatment methods cannot achieve chemical modification of the surface of recycled aggregate, and cannot further react with the attached mortar to obtain better adhesion with asphalt

Method used

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  • Chemical treatment method of recycled aggregate for asphalt concrete
  • Chemical treatment method of recycled aggregate for asphalt concrete
  • Chemical treatment method of recycled aggregate for asphalt concrete

Examples

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Embodiment

[0023] The preparation method of recycled aggregate chemical treatment reagent comprises the following steps, and the specific technological process is as follows: image 3 Shown:

[0024] 1) The molar ratio of tetraethyl orthosilicate to ethanol is 1:1. Calculate the mass of the two solutions according to the molar ratio, weigh them respectively, pour them into three beakers and stir for 1-2 minutes, and put them in a water bath for heating box for use;

[0025] 2) Dilute hydrochloric acid volume fraction Drop the calculated dilute hydrochloric acid into distilled water, control the pH of the obtained acidic solution at 2 to 3, and use a glass to stir evenly for 3 to 5 minutes;

[0026] 3) The molar ratio of tetraethyl orthosilicate to the acidic solution is 1:9, and the quality of the two solutions calculated according to the molar ratio is poured into the beaker respectively, and mixed evenly;

[0027] 4) Slowly pour the acidic solution into the prepared tetraethyl orth...

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Abstract

The invention discloses a chemical treatment method of recycled aggregate for asphalt concrete. The chemical treatment method specifically comprises the following steps: mixing tetraethoxysilane withethanol to prepare a mixed solution; adding diluted hydrochloric acid into the mixed solution to serve as a catalyst required by hydrolysis reaction, placing the chemical treatment solution in a constant-temperature water bath box; putting cleaned and air-dried recycled aggregate into a closed container, vacuumizing the container to a vacuum or approximately vacuum state; putting the vacuumized container filled with the recycled aggregate into the constant-temperature water bath box, introducing the chemical treatment solution into the vacuumized container through a rubber pipe; chemically processing the recycled aggregate, and providing an intermittent vibration environment while the reaction temperature is kept. Under the treatment conditions of constant temperature, vacuum, pressure reduction and vibration, the mixed solution can fully permeate into the recycled aggregate, and hydrolysis product silicon dioxide fills internal pores and micro-cracks in the recycled aggregate, so thatthe physical properties of the recycled aggregate are remarkably improved, the compatibility of the recycled aggregate and asphalt is enhanced, and the application of the recycled aggregate in asphalt concrete is facilitated.

Description

technical field [0001] The invention belongs to the field of recycled aggregates for asphalt concrete, and in particular relates to a chemical treatment method for recycled aggregates for asphalt concrete. Background technique [0002] The rapid development of my country's infrastructure construction has led to an increasing stock of construction waste, and its recycling has become a trend. The recycling of construction waste can effectively solve the shortage of natural sand and gravel. However, recycled aggregates have high mud content, low strength, and high porosity lead to high water absorption. Therefore, improving the performance of recycled aggregates is the key to realizing the reuse of construction waste. The current technologies for improving the quality of recycled aggregate mainly include physical strengthening methods and chemical strengthening methods. The physical strengthening method is mainly to mechanically stir and grind the recycled aggregate in a high ...

Claims

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Application Information

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IPC IPC(8): C04B20/02
CPCC04B20/023C04B18/16
Inventor 寇长江胡皓天王芸芸康爱红肖鹏吴正光
Owner YANGZHOU UNIV
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