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Waste concrete active slag powder as well as preparation method and application thereof
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A technology for waste concrete and slag powder, applied in solid waste management, climate sustainability, sustainable waste treatment, etc., to achieve the effects of low production cost, significant environmental and social benefits, and simple process
Active Publication Date: 2022-07-08
SHENYANG JIANZHU UNIVERSITY
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Problems solved by technology
However, there is almost no research on the preparation of recycled materials from waste concrete slag powder by means of multi-dimensional activation of mechanical force, microwave, and chemical excitation.
Method used
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[0035] The waste concrete active slag powder provided by the present embodiment is prepared by the following method:
[0036] S1. Pour fly ash, hexamethylenetetramine, sodium aluminate, polyaluminum chloride, ethylene glycol, n-butyl stearate, and surfactant into the mixer in proportion, and start running for 8 minutes to mix Mixture I was uniformly obtained; waste concrete slag powder, alkaline aluminum potassiumsulfate and sodium silicate were weighed in proportion, and added to a ball mill together with mixture I, and ground together for 30 minute...
Embodiment 2
[0040] The waste concrete active slag powder provided in this embodiment includes, in parts by weight, 90 parts of waste concrete slag powder, 5.9 parts of fly ash, 0.1 part of hexamethylenetetramine, 0.2 part of sodium aluminate, and 0.05 part of polyaluminum chloride. , 0.4 part of ethylene glycol, 1.5 part of alkaline aluminum potassiumsulfate, 1.2 part of sodium silicate, 0.5 part of n-butyl stearate, and 0.15 part of surfactant.
[0041] The preparation method of the waste concrete active slag powder provided in this example is basically the same as that of Example 1, except that the co-grinding time in step S1 is 25min, the specific surface area of the obtained mixture II is 413 m2 / kg, and step S2 The stirring time in step S3 is 5min, the power of microwave heating in step S3 is 10kW, and heating is 10min.
Embodiment 3
[0043] The waste concrete active slag powder provided in this embodiment includes, in parts by weight, 96 parts of waste concrete slag powder, 2 parts of fly ash, 0.05 part of hexamethylenetetramine, 0.05 part of sodium aluminate, and 0.1 part of polyaluminum chloride. , 0.1 part of ethylene glycol, 0.6 part of alkaline aluminum potassiumsulfate, 0.6 part of sodium silicate, 0.3 part of n-butyl stearate, and 0.2 part of surfactant.
[0044] The preparation method of the waste concrete active slag powder provided in this example is basically the same as that of Example 1, except that the co-grinding time in step S1 is 20min, the specific surface area of the obtained mixture II is 422 m2 / kg, and step S2 The stirring time in step S3 is 5min, the power of microwave heating in step S3 is 20kW, and heating is 5min.
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Abstract
The invention discloses waste concrete active slagpowder as well as a preparation method and application thereof. The waste concrete active slagpowder is prepared from the following components in parts by weight: 90 to 96 parts of waste concrete slagpowder, 2 to 6 parts of fly ash, 0.05 to 0.1 part of hexamethylenetetramine, 0.05 to 0.2 part of sodiumaluminate, 0.05 to 0.1 part of polyaluminum chloride, 0.1 to 0.4 part of ethylene glycol, 0.2 to 1.5 parts of alkaline aluminum potassium sulfate, 0.2 to 1.2 parts of sodiumsilicate, 0.1 to 0.5 part of n-butyl stearate and 0.1 to 0.2 part of surfactant. The preparation method comprises the following steps: uniformly mixing the fly ash, the polyaluminum chloride, the ethylene glycol, the n-butyl stearate and the surfactant in proportion; adding waste concrete slag powder, alkaline aluminum potassium sulfate and sodiumsilicate, and jointly grinding until the specific surface area is 400-450 m < 2 > / kg; and finally, adding water, spraying, uniformly mixing and heating by microwaves. During application, the active slag powder provided by the invention can replace 30% by weight of cement, and compared with the existing waste concrete active slag powder, the activity is obviously improved, and the requirement of recycling of waste concrete can be met.
Description
technical field [0001] The invention belongs to the technical field of recycling and utilization of waste building materials, in particular to a waste concrete active slag powder and a preparation method and application thereof. Background technique [0002] Waste concrete slag powder refers to the fine-grained solid waste with a particle size of less than 150 μm generated during the demolition of old concrete buildings and the production of recycled aggregates. Its main components include hardened cement stone, silica sand, carbonate or silicate stone. Chips, etc., are some of the materials that are most difficult to recycle in construction solid waste. Waste concrete slag powder is difficult to recycle because its main components are stable substances such as crystals, which have low activity. Unless certain activation measures are taken to waste concrete slag powder, it cannot be directly and effectively used. [0003] In the prior art, the commonly used activation meth...
Claims
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Application Information
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