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Fully-recycled concrete and preparation method thereof

A technology for recycling concrete and concrete, applied in the field of construction solid waste recycling, can solve problems such as increasing cost and energy consumption, and achieve the effects of improving efficiency, increasing strength, and reducing the setting of silos

Active Publication Date: 2021-07-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, it needs to be shipped separately during transportation, multiple silos are required when mixing recycled concrete, and recycled aggregates of various particle sizes are remixed, which significantly increases cost and energy consumption

Method used

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  • Fully-recycled concrete and preparation method thereof
  • Fully-recycled concrete and preparation method thereof
  • Fully-recycled concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0088] The invention provides a method for preparing continuously graded recycled aggregate, which is prepared by using a continuously graded recycled aggregate intelligent crushing integrated system, including the following steps:

[0089] 1) Input the construction solid waste raw material from the feeding device into the primary crushing device for crushing, and the crushed construction solid waste raw material is screened out by the screening device to obtain material a;

[0090] 2) Transport material a to the secondary crushing device through the first conveying device for crushing, and sort out the massive impurities in material a through the sorting device to obtain material b;

[0091] 3) The material b is transported to the sampling and dispersing device and the belt scale respectively through the second transmission device, and the material b transported to the sampling and dispersing device is vibrated and dispersed to make it flat, and the image information of the pa...

Embodiment 1

[0165] The construction solid waste raw materials are input into the feeder from the raw material warehouse through the conveyor belt conveyor, and then input into the jaw crusher for crushing. The jaw crusher is a PE-600×750 jaw crusher. 400-600mm, preferably 500mm, the output particle size is 150-200mm, preferably 180mm, and the crushing capacity is 80-240t / h, preferably 160t / h.

[0166] The crushed construction solid waste raw materials are screened by vibrating sieves to remove dregs and impurities, and the material a after sieving dregs is obtained. Then the material a is conveyed to the roller crusher at a uniform speed of 0.2m / s by the conveyor belt conveyor through the lower chute for crushing, and the material b is obtained. The massive impurities are sorted by the intelligent jet sorting equipment, and the material types are classified based on the density, and the massive materials with too low density are screened out and sent to the massive impurity storage room w...

Embodiment 2

[0172]The continuously graded recycled aggregate sample 1* prepared in Example 1 was mixed with other components to prepare fully recycled concrete water-stable material sample 1#. In the fully recycled concrete water-stabilized material sample 1#, in terms of mass percentage, the continuously graded recycled aggregate sample 1* is 90%, Portland cement is 3%, water is 6.7%, and sodium sulfate is 0.3%. For specific preparation, first add continuous graded recycled aggregate sample 1* and half of the amount of water for stirring according to the above ratio, then add other components and the other half of the amount of water for vibration and stirring, and then perform compression molding to obtain the obtained product.

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Abstract

The invention provides a fully-recycled concrete, which comprises the following components in percentage by mass: 70-90% of continuously-graded recycled aggregate; 3-15% of cement; 7-15% of water; 0-0.3% of an exciting agent; and 0-0.2% of an additive. The invention further provides a preparation method of the fully-recycled concrete. According to the fully-recycled concrete and the preparation method thereof, the adopted continuous grading recycled aggregate is controllable in grading, covers the recycled coarse aggregate, the recycled fine aggregate and the recycled micro powder, and reaches a close packing state. According to the continuous grading recycled aggregate, the filling effect of complete continuous grading, the micro-filling effect of the recycled micro-powder and the comprehensive effect of volcanic ash activity are fully exerted, and the large mixing amount of the recycled material is realized, so that the full utilization of building solid waste resources is promoted, the building solid waste can be utilized to the maximum extent, and the energy consumption of first screening in the building solid waste recycling process and second mixing in the concrete preparation process is reduced.

Description

technical field [0001] The invention belongs to the field of building solid waste recycling, and relates to a fully recycled concrete and a preparation method thereof. Background technique [0002] At present, my country's construction solid waste recycling industry has a certain amount of technical accumulation and technological progress. After the construction solid waste is classified, wood, plastic, steel bars, etc. are sorted out for reuse, and the remaining waste concrete and bricks are crushed and screened. After separation and cleaning, it is made into building coarse aggregate, fine aggregate and recycled micropowder, which are used to prepare recycled products such as new recycled concrete or unburned bricks. However, the aggregate gradation of crushed products in the existing construction solid waste recycling process is not controlled, and subsequent screening is required to obtain recycled aggregates of different particle sizes. Then, it needs to be shipped sepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B20/02B02C21/00B02C25/00B28C5/00G01N15/10
CPCC04B28/04C04B20/026B28C5/003B02C21/00B02C25/00G01N15/10C04B2201/50C04B2111/00017G01N2015/103G01N2015/1028G01N2015/1029C04B18/167C04B22/147C04B2103/302C04B22/062C04B22/064
Inventor 肖建庄刘琼丁陶马旭伟韩女
Owner TONGJI UNIV
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