Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of crushing and recycling uhpfrc into recycled concrete aggregate

A technology of recycled concrete and aggregates, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of high energy consumption, insufficient mechanical wear rate of crushing ultra-high performance concrete, and inability to recycle fibers, etc. To achieve the effects of controllable particle size, less surface cracks and low permeability

Active Publication Date: 2020-10-02
SHENZHEN UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The recycled concrete aggregate obtained by the current recycled concrete preparation process has a large number of microcracks, and the new concrete poured as aggregate will have initial defects that cannot be ignored
[0006] 2. The current recycled concrete preparation technology is not enough to break ultra-high performance concrete or can be broken but the mechanical wear rate is high and the energy consumption is high
[0007] 3. The current recycled concrete preparation process cannot recycle the fibers in fiber-reinforced ultra-high performance concrete, especially steel fibers

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of crushing and recycling uhpfrc into recycled concrete aggregate
  • Preparation method of crushing and recycling uhpfrc into recycled concrete aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The embodiments of the present invention will now be described with reference to the accompanying drawings, in which similar element numbers represent similar elements. As mentioned above, such as figure 1 As shown, the present invention provides a preparation method for crushing and recycling UHPFRC into recycled concrete aggregates, wherein UHPFRC: the abbreviation of Ultra high performance fibre reinforced concrete, its Chinese name is: ultra high performance fiber reinforced concrete, UHPFRC, compressive strength More than 150MPa, including the following steps:

[0029] In the S1 pretreatment step, the UHPFRC structure is destroyed into relatively small pieces, and then UHPFRC is infiltrated. Large-scale machinery is used to mechanically oscillate to destroy the ultra-high-strength concrete structure into relatively small pieces, remove impurities in UHPFRC, and sort steel fibers.

[0030] S2 Liquid nitrogen cooling step: Cooling the UHPFRC after the infiltration treatme...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
strengthaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method for crushing and recycling UHPFRC into recycled concrete aggregate. The preparation method comprises the following steps: pretreating: destroying an UHPFRCstructure into relatively small pieces, and then infiltrating UHPFRC; cooling by using liquid nitrogen: cooling the infiltrated UHPFRC by using the liquid nitrogen to reduce the UHPFRC temperature to0 DEG C or below; heating at high temperature: heating the cooled UHPFRC at high temperature to cause high-temperature cracking of the UHPFRC to destroy a connecting surface of the UHPFRC and fiber;crushing: crushing the cracked concrete to form the cracked UHPFRC; sieving: sieving the crushed UHPFRC according to the particle size. The invention discloses the preparation method for crushing andrecycling the UHPFRC into the recycled concrete aggregate, by which the energy consumption is reduced and the steel fiber recycling rate is increased.

Description

Technical field [0001] The invention relates to the technical field of concrete manufacturing, in particular to a preparation method for crushing and recycling UHPFRC into recycled concrete aggregates. Background technique [0002] Concrete is one of the most widely used and mature basic materials in civil engineering. Traditional concrete refers to a material that uses cement as a cementing material, stones and sand as coarse and fine aggregates, and is formulated with water in a certain proportion, and is fully mixed to obtain a load-bearing structure. With the development of science and technology, the invention and application of superplasticizers, ultra-fine mineral powders and fiber materials, concrete materials are developing in the direction of ultra-high performance concrete characterized by ultra-high strength and ultra-high durability. With strength as a sign, the development of concrete has experienced the development process of ordinary strength concrete (NSC), high...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/16
CPCC04B18/167C04B20/026Y02W30/91
Inventor 黄振宇黄新雄李伟文邢锋
Owner SHENZHEN UNIV