Self-compacting concrete prepared from recycled aggregate and preparation method thereof

A self-compacting concrete and recycled aggregate technology, applied in the field of building materials, can solve the problems of reduced mechanical properties of concrete materials, poor compactness of recycled aggregates, and increased water-cement ratio in the interface transition zone of new cement mortar, etc., to achieve improvement Mechanical strength, good dispersion effect, effect of improving dense structure

Active Publication Date: 2021-12-21
靖江市恒生混凝土制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that in the scheme of directly using recycled aggregates to prepare self-compacting concrete, due to the poor compactness of recycled aggregates, it contains a large number of gaps, resulting in high water absorption, and the absorbed water Participating in the hydration reaction during the concrete mixing process increases the water-cement ratio in the transition zone of the recycled aggregate-new cement mortar interface, making the structure of the interface zone loose and forming more pores, which will lead to a significant decrease in the mechanical properties of the concrete material.

Method used

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  • Self-compacting concrete prepared from recycled aggregate and preparation method thereof
  • Self-compacting concrete prepared from recycled aggregate and preparation method thereof
  • Self-compacting concrete prepared from recycled aggregate and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Parts by weight basis, 45 parts of acetone were weighed, and 10 parts of 3 parts of silicon carbide nanometers silane coupling agent KH-560 was placed in a stirring device, stirring and mixing using triethylamine adjusted to pH 4.5, and collecting the mixture 200W was placed at an ultrasonic dispersion 10min, dispersed suspension were collected and placed at 200 ℃ dried 3h, left to cool to room temperature and grind to obtain modified nano silicon carbide particles;

[0032] Mass ratio of 1: 3: 15, modified nano silicon carbide particles, fly ash is added to a solids content of 28% water glass, mixed by stirring and placed under 200W ultrasonic dispersion 10min, collected liquid coating modification; after 5, was added to the recycled aggregate cOATED liquid, after pressure to 3MPa, pressure treatment after soaking 25min, 25min and then treated in the ultrasonic vibration 200W, soaking taken: taking recycled aggregate mass ratio of 1 press aggregate and placed to dry at roo...

Embodiment 2

[0034] According to the weight of the weight, 47 parts of acetone, 12 parts of nanocarbium carbide and 4 parts of silane coupling KH-560, respectively, were placed in a stirring device, stirred and mixed with triethylamine and adjusted pH to 4.7, collecting mixed liquid parallel The ultrasonic dispersion was dispersed at 250w, and the dispersion suspension was collected and dried at 210 ° C for 4 h, and the sedation was allowed to cool to room temperature and crushed, and the nano silicon carbide particles were changed.

[0035] According to the mass ratio 1: 3: 15, the modified nano silicon carbide particles, fly ash addition to a water glass having a solid content of 28%, stirred and mixed with ultrasonic dispersion of 250W, and the coated modified liquid is collected; Reproduced aggregates and by mass 1: 5, the regenerated aggregate was added to the coated modified solution, pressurized to 4 MPa, after pressure soaking treatment 27min, then the ultrasonic vibration treatment of 2...

Embodiment 3

[0038] According to the weight of the weight, 50 parts of acetone, 15 parts of nanocarbium carbide and 5 parts of the coupling agent were weighed, and the mixture was stirred and mixed with triethylamine and mixed with mixed liquid and placed under 300W. Ultrasonic dispersion 15min, collects the dispersion suspension and dried at 220 ° C for 5 h, and allows for cooling to room temperature and ground pulverization, modified nano silicon carbide particles;

[0039] According to the mass ratio of 1: 3: 15, the modified nanocarbium carbide particles, the fly ash addition to a solid content of 28%, stirred mixed and placed at 300W, ultrasonic dispersion 15min, and collectively modified liquid; Reproduced aggregates and add the regenerated aggregate to the coated modified liquid, pressurized to 5 MPa, pressurized to 5 MPa, and then the ultrasonic vibration of 30 min at 300 w, after removing soaking The aggregate is placed at room temperature, and the concrete after drying is placed in a...

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Abstract

This application relates to the field of light-adjusting films, and specifically discloses a self-compacting concrete prepared from recycled aggregates. The self-compacted concrete prepared from recycled aggregates includes: 40-50 parts of heat-resistant coarse aggregate, 10-15 parts of modified Recycled aggregate, 30-40 parts of fine aggregate, 8-10 parts of cement, 6-10 parts of water, 4-8 parts of mineral powder and 2-5 parts of fly ash. This application optimizes the structure of recycled aggregate in self-compacting concrete with recycled aggregate configuration. By coating it with grout, the compactness of the material is improved, and the capillary pores and microscopic cracks in the recycled aggregate are filled, and at the same time, it is coated with grout The post-recycled aggregate structure is round, and the pores formed between the actual filled material and the material are small, thereby further improving the compact structure of self-compacting concrete, and effectively improving the mechanical strength of self-compacting concrete prepared with recycled aggregate.

Description

Technical field [0001] The present application relates to the field of building materials, and more particularly, it relates to self-compacting concrete and its preparation method of regenerating aggregate formulated. Background technique [0002] Self-compacting concrete recycled aggregate concrete refers to self-compacting concrete with natural coarse aggregate substitute recycled coarse aggregate portion is formed, while the self-compacting concrete having high fluidity, without isolation, uniformity and stability, pouring when their own weight without vibration to achieve dense concrete, therefore, it can be recycled aggregate concrete self-compacting concrete while various advantages inherited from dense, but also recycling of construction waste and recycled coarse aggregate, so as to protect the environment, the purpose of conservation of natural resources. [0003] Chinese Patent Publication No. related art of the CN103130473B discloses a recycled aggregate formulated C20 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02C04B20/10C04B20/02C04B111/76
CPCC04B28/02C04B20/1085C04B20/023C04B2201/50C04B2111/76C04B18/16C04B18/12C04B18/08C04B14/324
Inventor 蔡连鑫
Owner 靖江市恒生混凝土制造有限公司
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