A method of using waste concrete to prepare humidity-adjusting materials

A technology of waste concrete and humidity-controlling materials, which is applied in the field of using waste concrete to prepare humidity-conditioning materials, to achieve the effects of reducing energy consumption, improving strength, and easily obtaining raw materials

Active Publication Date: 2020-12-01
TONGJI UNIV
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Problems solved by technology

And the example that waste concrete is prepared as moisture-conditioning material has not been seen yet.

Method used

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  • A method of using waste concrete to prepare humidity-adjusting materials
  • A method of using waste concrete to prepare humidity-adjusting materials
  • A method of using waste concrete to prepare humidity-adjusting materials

Examples

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Embodiment 1-7

[0019] The waste concrete is first crushed and dried at 80°C, then ball milled and passed through a 100-mesh sieve. Measure waste concrete powder and slaked lime (analytically pure, China Sinopharm Reagent Co., Ltd.) in different proportions as shown in Table 1 as the main raw material according to the waste concrete powder and calcium oxide mass percentage as 100%, mix evenly, then add water, The water-mixed mass is 20% of the total mass of the above two raw materials, and stirred evenly, pressed and molded under a molding pressure of 30MPa and demolded to obtain a block sample with a size of 40mm×15mm×6mm, and finally put it into the reaction kettle , and reacted for 12 hours under the temperature condition of 200° C. to prepare the humidity-conditioning materials of Examples 1-7. Carry out three-point flexural strength test to embodiment 1-7, its result is shown in table 1. The X-ray powder diffraction analysis result of embodiment 1-7 sees figure 1 And Table 1 (only the ...

Embodiment 8-10

[0025] In order to further improve the humidity control performance of the bulk sample, on the basis of the main raw material proportioning (20% added amount of slaked lime) in Example 3, add 0% to 30% sepiolite powder (provided by Hunan Huajie Baoling sepiolite Technology Co., Ltd.) as modified raw materials, mix the two evenly, and finally add water accounting for 20% of the total mass and stir evenly, press and mold under a molding pressure of 30MPa and demould, and the obtained size is 40mm×15mm× A block sample of 6 mm was finally put into a reaction kettle and reacted at a temperature of 200° C. for 12 hours to prepare the humidity-conditioning materials of Examples 8-10. Because the flexural strength of Example 3 reaches 22MPa, and the amount of sepiolite added is small, the flexural strength of Examples 8-10 does not change much, and its phase composition and humidity control amount are as shown in Table 2. The humidity control effect For details, see image 3 .

[00...

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Abstract

The invention relates to a method for preparing a humidity controlling material by utilizing waste concrete, and belongs to the technical fields of recycling of waste concrete and building materials.The method comprises the following steps: the waste concrete is firstly dried, the dried waste concrete is broken, and the broken waste concrete is sieved; then 60%-90% by mass of the dried concrete powder and 10%-40% by mass of calcium oxide are weighed, the weighed dried concrete powder and calcium oxide are mixed uniformly, the obtained material is used as a main raw material, finally water ismixed, wherein the mixing amount of the water is 20% of the total mass of the raw materials, uniform stirring is performed, a block-shaped sample is obtained by pressing under the forming pressure of30MPa, demolding is performed, finally the block-shaped sample is put into a reaction kettle, a reaction is performed for 1-48h at the temperature of 80-240 DEG C, and therefore the block-shaped humidity controlling material is obtained; and after testing is performed, results find that the mechanical properties and humidity controlling effect are good, and after a modifying raw material (0%-30% of sepiolite) is added additionally, the humidity controlling effect can be greatly increased. The method provided by the invention uses the waste concrete, the waste concrete is cheap and easy to obtain, and the method has a simple technology, saves energy and protects the environment, is easy to produce in a large scale, and can realize high value-added recycling of the waste concrete.

Description

technical field [0001] The invention relates to a method for preparing humidity-regulating materials by using waste concrete, and belongs to the technical field of resource comprehensive utilization of waste concrete and humidity-controlling functional building materials. [0002] technical background [0003] According to statistics, the total amount of construction waste generated in my country reached 1 billion tons in 2013, and the total amount is still increasing. Among them, waste concrete is an important part of urban construction waste. It is imperative to turn it into resources. The current recycling method for waste concrete is relatively simple, mainly to recycle the waste concrete as recycled aggregate, and then carry out the production and construction of concrete buildings again, such as the Chinese patent "Using Construction Waste to Prepare Recycled Aggregate Semi-dry Hardness Concrete and its preparation method" (publication number CN102390963A); Chinese pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/10
CPCC04B28/10C04B2201/50C04B18/16C04B14/042
Inventor 景镇子苗嘉俊范宏圆
Owner TONGJI UNIV
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