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Ecological high-ductility cement-based composite material and method prepared from organic waste

A technology of organic waste and composite materials, applied in the direction of solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as the decrease of fracture toughness of cement-based material matrix, restrictions on the popularization and application of HDCC, and weak transition zones , to achieve the effect of being conducive to ecological construction, large-scale project application prospects, and high ductility

Active Publication Date: 2020-02-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the preparation of HDCC mostly uses Nissan Kuraray polyvinyl alcohol fiber (PVA) and quartz sand, and the cost is high, which limits the popularization and application of HDCC in engineering.
Domestic fiber and ordinary river sand are used, and an appropriate amount of organic solid waste is added as recycled aggregate. Since the organic matter in the organic aggregate combines with calcium ions to inhibit the growth of calcium hydroxide at the interface between the aggregate and the slurry, the organic bone The transition zone between the cement-based material and the slurry interface is weaker, resulting in a decrease in the fracture toughness of the cement-based material matrix, and the bridging effect of the fibers can be fully exerted. Compared with the use of inorganic aggregates (such as river sand), organic solid waste aggregates Adding low-cost ecological high-ductility cement-based composites (Ecological HDCC, ECO-HDCC) can be prepared, but there are few reports on this preparation method

Method used

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  • Ecological high-ductility cement-based composite material and method prepared from organic waste
  • Ecological high-ductility cement-based composite material and method prepared from organic waste
  • Ecological high-ductility cement-based composite material and method prepared from organic waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The matching ratio of the ECO-HDCC of the present invention is shown in the following table 1:

[0031] Table 1 ECO-HDCC mix ratio (mass ratio)

[0032]

[0033] The cement used above is ordinary portland cement with strength grade 42.5, the particle size of the river sand is 0.15-1.18mm, and the fineness modulus is 1.68, and the organic waste is asphalt milling material, the particle size is 0.15-1.18mm, The modulus is 1.72, the viscosity of the viscosity modifier is 20000mPa.s, and the fiber type is polyvinyl alcohol fiber.

[0034] The preparation steps are as follows:

[0035] 1) Dry mix cement, fly ash, solid water reducing agent, viscosity modifier, fine sand and asphalt milling material in a mixer for 90 seconds, and the rotation frequency of the mixer blade is 130 rpm;

[0036] 2) Add water and stir for 3 minutes, and the rotation frequency of the mixer blade is 285 rpm;

[0037] 3) Add fiber and stir for 2 minutes, and the rotation frequency of the mixer ...

Embodiment 2

[0040] The matching ratio of the ECO-HDCC of the present invention is shown in the following table 2:

[0041] Table 2 ECO-HDCC mix ratio (mass ratio)

[0042]

[0043] The cement used above is ordinary Portland cement of strength grade 52.5, the organic waste is waste rubber particles, the particle size is 0.15-1.18mm, the fineness modulus is 1.74, the viscosity of the viscosity modifier is 15000mPa.s, and the fiber type is polyethylene fiber.

[0044] The preparation steps are as follows:

[0045] 1) Dry mix cement, fly ash, solid water reducing agent, viscosity modifier and waste rubber particles in a mixer for 1 minute, and the rotation frequency of the mixer blades is 140 rpm;

[0046] 2) Add water and stir for 3 minutes, and the rotation frequency of the mixer blade is 280 rpm;

[0047] 3) Add fiber and stir for 2 minutes, and the rotation frequency of the mixer blade is 280 rpm;

[0048] 4) Install the mold, remove the mold after 48 hours, and standardize for 28 ...

Embodiment 3

[0050] The matching ratio of the ECO-HDCC of the present invention is shown in the following table 3:

[0051] Table 3 ECO-HDCC mix ratio (mass ratio)

[0052]

[0053] The cement used above is ordinary Portland cement with strength grade 42.5, the particle size of the river sand is 0.15-1.18mm, and the fineness modulus is 1.68. The organic waste is waste epoxy resin particles, the particle size is 0.15-1.18mm, fine The degree modulus is 1.81, the viscosity of the viscosity modifier is 20000mPa.s, and the fiber type is polypropylene fiber.

[0054] The preparation steps are as follows:

[0055] 1) Dry mix cement, fly ash, viscosity modifier, fine sand and waste epoxy resin particles in a mixer for 2 minutes, and the rotation frequency of the mixer blades is 130 rpm;

[0056] 2) After uniformly mixing water and liquid superplasticizer, stir for 210 seconds, and the rotation frequency of the mixer blade is 140 rpm;

[0057] 3) Add fiber and stir for 150 seconds, and the ro...

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Abstract

The invention relates to an ecological high-ductility cement-based composite material prepared from organic wastes, and a preparation method thereof. The cement-based composite material comprises, bymass, 100 parts of cement, 50-67 parts of fly ash, 42-50 parts of water, 10-40 parts of fine sands, 10-50 parts of organic wastes, 0.3-0.8 part of a water reducer, 0.1-0.13 part of a viscosity regulator and 2.6-3.4 parts of fibers. The preparation method comprises the following steps: carrying out dry mixing the cement, fly ash, the water reducer, the viscosity regulator, the fine sands and the organic wastes in a stirrer for 1-2 min; adding water, stirring the obtained mixture and water for 3-4 min; adding the fibers, stirring the obtained mixture and the fibers for 2-3 min; and filling a diewith the finally obtained mixture, carrying out die stripping after the plasticity is completely lost, and carrying out standard curing for 28 days or 60 DEG C steam curing for 3 days. The low-cost ecological high-ductility cement-based composite material prepared from organic wastes has great application prospect in engineering, solves a problem that the wastes cannot be processed or are improper to process, and has protruding technologic, ecologic and environmentally-friendly benefits.

Description

technical field [0001] The invention relates to a method for preparing an ecological high-ductility cement-based composite material from organic waste, and belongs to the field of building materials. Background technique [0002] The "Thirteenth Five-Year Plan" proposed to focus on environmental governance and ecological construction. However, a large amount of organic waste, such as asphalt planing and milling materials, waste rubber particles, waste resin particles, and waste plastic particles, will cause environmental damage if not handled properly. Pollution, so it is necessary to find an effective way to deal with a large amount of waste. If waste is added to cement-based composite materials as a recycled aggregate to prepare ecological cement-based composite materials, it can not only recycle waste as a new treatment method, but also save the cost of cement-based composite materials. [0003] High Ductility Cementitious Composites (HDCC) is a kind of cement, mineral a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B18/16C04B18/20C04B18/22
CPCC04B28/04C04B18/08C04B14/068C04B18/16C04B16/0641C04B2103/302C04B2103/0068C04B18/22C04B16/0625C04B18/20C04B16/0633Y02W30/91
Inventor 郭丽萍柴丽娟徐燕慧丁聪
Owner SOUTHEAST UNIV
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