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Optimized ratio and preparation method of recycled GFRP powder and slag-based geopolymer cementing material

A technology for cementitious materials and slag, applied in the field of building materials, can solve problems such as blanks, achieve the effects of improving flexural strength, solving difficulty in recycling and improving compressive strength

Active Publication Date: 2022-04-05
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing GFRP powder uses GFRP powder as fine aggregate instead of river sand to prepare cement mortar, ("Assessment of glass fiber reinforced polymer waste reuse as filler inmortars" , Farinha et al., pp. 1579-1594, Journal of Cleaner Production, 2019), but the research on the synergistic preparation of geopolymers from alkali-activated recovery of GFRP powder and slag is still blank

Method used

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  • Optimized ratio and preparation method of recycled GFRP powder and slag-based geopolymer cementing material
  • Optimized ratio and preparation method of recycled GFRP powder and slag-based geopolymer cementing material
  • Optimized ratio and preparation method of recycled GFRP powder and slag-based geopolymer cementing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Example 1: In the reclaimed GFRP powder and slag binary geopolymer cementitious material, the weight percentage of the reclaimed GFRP powder is 17.7% (the mass ratio to the slag is 3:7), the weight percentage of the slag is 41.2%, and the alkali excitation solution The weight percentage is 41.1%, the alkali excitation solution concentration is 80%, the alkali excitation solution modulus is 1.5, and the liquid-solid ratio is 0.7.

[0040] like figure 1 As shown in the work performance test, compared with the alkali-activated slag cementitious material without GFRP powder, the fluidity of the alkali-activated slag cementitious material with a mass ratio of GFRP powder to slag of 3:7 is increased by 10%; initial setting time and final setting The time was extended by 30%, and the alkali-activated single GFRP powder geopolymer gelled material compared with the alkali-activated gelled material containing 30% GFRP, its fluidity increased by 35%, and the initial setting time a...

Embodiment 2

[0042] Embodiment 2: in reclaiming GFRP powder and slag binary geopolymer cementitious material, the weight percentage of reclaiming GFRP powder is 29.41% (50% of precursor material quality), the weight percentage of slag is 29.41%, the weight of alkali excitation solution The percentage is 41.1%, the concentration of the alkali excitation solution is 80%, the modulus of the alkali excitation solution is 1.5, and the liquid-solid ratio is 0.7.

[0043] like figure 1 The working performance test shows that compared with the alkali-activated slag cementitious material without GFRP, the fluidity of the alkali-activated slag cementitious material containing 50% GFRP is increased by 21%; the initial setting time and final setting time are respectively prolonged by 31%, 38%,

[0044] like figure 2 The mechanical performance test with a curing age of 28 days shows that when the content of GFRP powder increases from 30% to 50%, the compressive strength and flexural strength begin ...

Embodiment 3

[0045] Embodiment 3: in reclaiming GFRP powder and slag binary geopolymer cementitious material, the weight percentage of reclaiming GFRP powder is 41.18% (70% of precursor material quality), the weight percentage of slag is 17.65%, the weight of alkali excitation solution The percentage is 41.1%, the concentration of the alkali excitation solution is 80%, the modulus of the alkali excitation solution is 1.5, and the liquid-solid ratio is 0.7.

[0046] like figure 1 The work performance test shows that compared with the alkali-activated slag cementitious material without GFRP, the fluidity of the alkali-activated cementitious material containing 70% GFRP is increased by 29.8%; the initial setting time and final setting time are respectively prolonged by 33.3%, 38.7% %,

[0047] like figure 2 The mechanical properties test with a curing age of 28 days shows that when the GFRP powder content increases from 30% to 70%, the compressive strength and flexural strength of the alk...

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Abstract

The invention discloses an optimized ratio and a preparation method of a recycled GFRP powder and slag based geopolymer cementing material, the cementing material comprises the following components by weight: 5%-42% of recycled GFRP powder, 17%-53% of slag, and 40%-47% of an alkali-activated solution, the concentration of the alkali-activated solution is 75%-85%; the modulus of the alkali-activated solution is 1.3-1.5; the liquid-solid ratio is 0.7 to 0.9. The recycled GFRP powder and the slag are taken as precursors of the geopolymer, and the recycled GFRP powder and slag binary geopolymer is formed through reasonable material combination and proportioning, so that environmental pollution and resource waste caused by GFRP waste are reduced, and the flash coagulation problem of the slag geopolymer in the preparation process and the problem of high contractility during maintenance are solved. The geopolymer concrete can be prepared by replacing a cement binding material, and the geopolymer concrete can also be directly used as a binding material.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for reusing recycled GFRP powder. The recycled GFRP powder and slag are used as alkali-activated active materials to carry out the ratio design, preparation method and optimization of a binary geopolymer gelling system. Background technique [0002] Fiber-reinforced resin-based composites (FRP) have been widely used in aerospace, energy, and infrastructure fields. With the rapid development of composite materials, the recycling of its waste has become increasingly prominent. In particular, thermosetting resin-based composites are insoluble and difficult to recycle. At present, the recycling of thermosetting composite materials can be divided into three categories: mechanical recycling, pyrolytic recycling, and chemical recycling. The mechanical recycling method has a simple process and is often used as a filler or to produce low-end composite mat...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/14C04B28/00
CPCY02P40/10
Inventor 王俊郑楚继
Owner NANJING UNIV OF TECH