Aggregate treatment method for enhancing chlorine salt erosion resistance of construction waste recycled concrete
A technology for recycling concrete and construction waste, applied in the direction of sustainable waste treatment, climate sustainability, solid waste management, etc. The effect is limited and other problems, to achieve the effect of being conducive to consumption and recycling, reducing the chloride ion migration coefficient, and significantly improving performance.
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Embodiment 1
[0028] This embodiment includes the following steps:
[0029] (1) Preparation of recycled coarse aggregate from construction waste: coarsely classify waste concrete construction waste, sort and remove impurities, crush and sieve, etc., to obtain recycled coarse aggregate with a particle size range of 5-25 mm, and air-dry naturally for backup use.
[0030] (2) Pretreatment of recycled coarse aggregate of construction waste: immerse the recycled coarse aggregate obtained in step (1) in slaked lime emulsion with a concentration of 1:10 for 30 minutes, and stir it every 10 minutes, then take it out and store it indoors. Let it dry for 24 hours, then move it into an oven at 60°C for drying.
[0031] (3) Neutralization treatment of recycled coarse aggregate of construction waste: spread the recycled coarse aggregate obtained in step (2) on a tray, and move it into a concrete carbonation box (control temperature is 20±3°C, gas concentration is 20 ±3%, and the humidity is 70±5°C) fo...
Embodiment 2
[0042] This embodiment includes the following steps:
[0043] (1) Preparation of recycled coarse aggregate from construction waste: coarsely classify waste concrete construction waste, sort and remove impurities, crush and sieve, etc., to obtain recycled coarse aggregate with a particle size range of 5-25 mm, and air-dry naturally for backup use.
[0044](2) Pretreatment of recycled coarse aggregate of construction waste: soak the recycled coarse aggregate obtained in step (1) in slaked lime emulsion with a concentration of 1:20 for 60 minutes, and stir it every 10 minutes, then take it out, and store it indoors. Let it dry for 24 hours, then move it into an oven at 80°C for drying.
[0045] (3) Neutralization treatment of recycled coarse aggregate of construction waste: spread the recycled coarse aggregate obtained in step (2) on a tray, and move it into a concrete carbonation box (control temperature is 20±3°C, gas concentration is 20 ±3%, and the humidity is 70±5°C) for n...
Embodiment 3
[0055] This embodiment includes the following steps:
[0056] (1) Preparation of recycled coarse aggregate from construction waste: coarsely classify waste concrete construction waste, sort and remove impurities, crush and sieve, etc., to obtain recycled coarse aggregate with a particle size range of 5-25 mm, and air-dry naturally for backup use.
[0057] (2) Pretreatment of recycled coarse aggregate of construction waste: immerse the recycled coarse aggregate obtained in step (1) in slaked lime emulsion with a concentration of 1:15 for 40 minutes, and stir it every 10 minutes, then take it out, and store it indoors. Let it dry for 24 hours, then move it into a 70°C oven for drying.
[0058] (3) Neutralization treatment of recycled coarse aggregate of construction waste: spread the recycled coarse aggregate obtained in step (2) on a tray, and move it into a concrete carbonation box (control temperature is 20±3°C, gas concentration is 20 ±3%, and the humidity is 70±5°C) for n...
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