Method for recycling disuse concrete and device thereby

Abstract

The invention relates to a method used for recycling waste concrete and a device thereof. By adopting the method, the waste concrete is washed with water and separated by using a vibrating screen; the cementitious material is separated in seriflux state from sand stone mixture and then is precipitated and processed with negative pressure water absorption, thereby the water content of the cementitious material is controlled within any level of scheduled 30 to 50 percent; according to the selection of the concrete intensity grades, exceeding amount of different doped contents are used for replacing parts of the cement to produce the concrete, and the water contained in the seriflux of the cementitious material is deducted. The concrete of C25 grade and the grade below C25 replaces the cement in exceeding amount according to 10 to 20 percent of the cement quality, and the exceeding coefficient is 2.5 to 3.0; the concrete of C30 grade and the grade above C30 replaces cement in exceeding amount according to 5 to 10 percent of cement quality and the exceeding coefficient is 2.5 to 3.0; proper amount of retarder can be added into the seriflux of the cementitious material which can not be utilized within two hours to ensure the activity of the srifulux of the cementitious material; the separated water can be used for producing concrete or recycled for car-washing circularly; the separated sand and stone can be used as the raw material for producing concrete; the invention is ingeniously conceived, which realizes the purpose of thoroughly recycling the waste concrete with low investment and low cost, has tremendous economic benefit and plays an important role in environmental protection.

Description

Technical field: [0001] The invention relates to a recycling method and device for waste concrete suitable for commercial concrete companies and concrete mixing stations. Background technique: [0002] Waste concrete has always been a headache for commercial concrete companies. Although some manufacturers provide a variety of recycling equipment, but because the price of the equipment is too high, the processing cost is higher than the value of the recycled material, and the recovery rate is low, and the cementitious material cannot be fully recycled. Chinese patent announcement ZL02208024.4 is a waste concrete sand and gravel slurry water recovery device, which is composed of a drum type separation unit, an electrical control box, two sedimentation rooms, a clean water room and agitator, and its working principle is through drum type separation The machine separates sand, stone, and slurry water, and the slurry water is deposited in the sedimentation room and then pumped t...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the large power required for its design, as long as there is a mixer truck for cleaning, it must be turned on and running. Therefore, the main engine needs to be turned on for a long time. Mechanical idling causes energy waste, and the recycling cost is greater than the value of recycled products

[0004] 2. The separator adopts the drum type, which causes serious mechanical wear and high maintenance costs. When a large amount of concrete is scrapped, it is difficult to separate and prone to blockage

[0005] 3. Pump the settled slurry water to the concrete mixing building. If the concentration of the slurry water is too high, the pipeline is prone to blockage and difficult to operate.

[0006] 4. The activity of the cementitious material cannot be controlled. When the cementitious material loses its activity and is added to the concrete, the quality of the concrete will be affected

[0007] 5. The concentration of slurry water cannot be controlled, which makes it difficult to control the water-cement ratio of concrete

[0008] 6. The gelling performance of the gelling material has not been utilized, and its value has not been exerted, resulting in waste

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