CN114276034B - Base polymer cementing material for recycling GFRP powder and slag and preparation method thereof - Google Patents
Base polymer cementing material for recycling GFRP powder and slag and preparation method thereof Download PDFInfo
- Publication number
- CN114276034B CN114276034B CN202210093077.2A CN202210093077A CN114276034B CN 114276034 B CN114276034 B CN 114276034B CN 202210093077 A CN202210093077 A CN 202210093077A CN 114276034 B CN114276034 B CN 114276034B
- Authority
- CN
- China
- Prior art keywords
- gfrp
- slag
- powder
- alkali
- solution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses an optimized proportion and a preparation method of a reclaimed GFRP powder and slag based geopolymer cementing material, wherein the cementing material comprises the following components in percentage by weight: 5-42% of recovered GFRP powder, 17-53% of slag and 40-47% of alkali-excited solution, wherein the concentration of the alkali-excited solution is 75-85%; the modulus of the alkali-activated solution is 1.3-1.5; the liquid-solid ratio is 0.7-0.9. The invention takes the recovered GFRP powder and the slag as precursors of geopolymer, and forms the recovered GFRP powder and the slag binary geopolymer through reasonable material combination and proportioning, thereby reducing the pollution of GFRP waste to the environment and resource waste, and improving the flash coagulation problem of the slag geopolymer in the preparation process and the problem of large shrinkage during maintenance. The geopolymer concrete can be prepared by replacing cement cementing materials and can also be directly used as a bonding material.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a recycling method of recovered GFRP powder.
Background
Fiber reinforced resin based composites (FRPs) have been widely used in the fields of aerospace, energy and infrastructure. With the rapid development of composite materials, the problem of recycling waste materials is increasingly prominent. Particularly, thermosetting resin-based composite materials have the characteristic of insolubility and are difficult to recycle. At present, the recovery of thermosetting composite materials can be divided into three main categories: mechanical recovery, pyrolysis recovery, chemical recovery. The mechanical recovery method has simple process and is mainly used as a filler or for producing low-end composite materials. The pyrolysis recovery method needs to degrade the resin in a furnace with the temperature of not lower than 450 ℃, and the energy consumption is very high. The organic solvent used in the chemical recovery method degrades the resin, which is easy to cause environmental pollution. Therefore, the development of an economic, reasonable, green and environment-friendly composite material recycling method is a problem to be solved urgently at present.
The geopolymer is a novel amorphous inorganic silica-alumina gel material which is formed by polymerizing silica tetrahedron and aluminum tetrahedron under the action of an alkali activator and structurally has a spatial three-dimensional network-shaped bonding structure by taking natural aluminosilicate minerals or industrial solid wastes (such as fly ash, slag, silica fume, metakaolin and the like) as main raw materials.
Glass fiber composites (GFRP) are one of the most widely used composites at present, and pultruded GFRP products mainly contain about 70% of glass fibers and 30% of resin (e.g. epoxy resin, unsaturated resin, etc.), the most important components of the fibers are silica, alumina and calcium oxide, although glass fibers (long or short fibers) react with alkaline solution very slowly and are considered to have no alkali-activating activity, but glass fiber powder or glass powder particle size reaches a range comparable to that of fly ash and can react with alkaline solution to form silica tetrahedrons and aluminum tetrahedrons, and according to the term ("a optimization of alkali-activated carbon adsorption glass powder, slag and calcium aluminate", et al, page 117983, construction & reinforcing materials, 2020) when the content of resin in the geopolymer does not exceed 10%, the microstructure of the geopolymer can be improved and the corrosion resistance of the polymer in the environment can be improved.
The GFRP powder is used as fine aggregate to replace river sand to prepare cement mortar (Association of glass fiber reinforced polymer road used as filler in mortars, farinha et al, pp 1579-1594, journal of Cleaner Production, 2019), but the research of alkali-activated recovered GFRP powder and slag to prepare geopolymer in cooperation is blank.
Compared with the patent number 202010625749.0, the difference is 1) the types of the used precursors are simplified, the precursors used in the patent number 202010625749.0 comprise recovered GFRP powder, recovered BFRP powder, metakaolin, fly ash, slag, PVA fiber and nano particles, the preparation is complicated, and the precursors of the patent only comprise slag and recovered GFRP powder, so the construction is easy; 2) In the patent No. 202010625749.0, the slag mixing amount does not exceed 5%, otherwise, the gelled material is instantaneously condensed and cannot be constructed, the use amount of recovered GFRP powder and slag is greatly increased, and when the slag mixing amount reaches 70%, the fluidity and the setting time still meet the standard requirements of GB175-2007 general Portland Cement; 3) The strength of the geopolymer cementing material prepared according to the proportion of the geopolymer cementing material is greatly improved compared with that of the geopolymer in the patent No. 202010625749.0; 4) The patent No. 202010625749.0 is mainly used for preparing alkali-activated geopolymer concrete, and the alkali-activated geopolymer cementing material is mainly designed in the patent, and can be used for preparing geopolymer concrete and can be directly used as a bonding material.
According to the preparation method, the reclaimed GFRP powder and the slag are combined to prepare the cementing material through alkali excitation, so that the problem of environmental pollution is effectively solved, the problems of high shrinkage of geopolymer and easy generation of shrinkage cracks are solved, a convenient, green and environment-friendly new way is developed for recycling of the composite material, and the preparation method has high economic benefit.
Disclosure of Invention
The invention aims to solve the problems of difficult recovery and utilization of GFRP waste and easy flash coagulation of alkali-activated slag, and uses recovered GFRP powder and slag as precursors of geopolymer to form binary geopolymer of the recovered GFRP powder and the slag through reasonable material combination and proportion, thereby reducing pollution of the GFRP waste to the environment and resource waste, and improving the flash coagulation problem of the slag geopolymer in the preparation process and the problem of large shrinkage during maintenance.
The technical scheme adopted by the invention is as follows:
an optimized proportion of recycled GFRP powder and slag-based geopolymer cementing material comprises the following components in percentage by weight:
recovering 5 to 42 percent of GFRP powder,
17 to 53 percent of slag,
40 to 47 percent of alkali-activated solution,
wherein 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 0.7-0.9.
Preferably, the recovered GFRP powder is 17.7% by weight, the slag is 41.2% by weight, the alkali challenge solution is 41.1% by weight, and the alkali challenge solution is 80% by weight; the modulus of the alkali-activated solution is 1.5; the liquid-solid ratio is 0.7, the compression strength and the breaking strength are highest in 28 days, and the setting time and the fluidity meet the standard requirements of GB175-2007 general Portland Cement.
Preferably, d of the recovered GFRP powder 50 D of slag not exceeding 14 μm 50 Not more than 12 μm, wherein d 50 The particle size distribution is 50%.
The main chemical components of the recovered GFRP powder and slag are shown in Table 1;
TABLE 1 recovery of GFRP powder and Main chemical composition of slag (%)
| Chemical composition (%) | CaO | MgO | Al 2 O 3 | SiO 2 | Fe 2 O 3 | SO 3 | K 2 O | Na 2 O | Loss | Total |
| Recovering GFRP powder | 20.57 | 3.45 | 10.62 | 33.71 | 0.63 | 0.98 | 0.32 | 0.21 | 28.12 | 99.12 |
| Slag of mine | 34.15 | 6.04 | 17.78 | 34.46 | 1.03 | 1.65 | 0.27 | 0.39 | 0.84 | 96.61 |
Preferably, the alkali-activating solution is prepared by adding sodium hydroxide solution into sodium silicate solution to adjust the designed modulus.
The preparation method of the reclaimed GFRP powder and slag-based geopolymer cementing material comprises the following steps:
1) Firstly, pouring the GFRP powder and the slag according to the weight percentage into a planetary cement mortar stirrer, and drying and stirring for 1min at a low speed.
2) Then injecting the alkali activator solution prepared one day in advance into the solution, and stirring the solution at a low speed for 2min; stirring at high speed for 3min.
3) After completion of the stirring, the molding was carried out immediately, a 40X 160mm mold was set on a tapping table, and the gelled material was charged into the mold in two portions. Compacting and molding on a cement mortar vibration table, scraping the surface, and covering a preservative film on the surface to prevent moisture evaporation.
4) Standing at room temperature for one day, demolding, and curing in standard curing chamber (20 + -2 deg.C, humidity > 95%) to corresponding age.
The geopolymer cementing material has higher strengthThe key of the degree lies in the design of the mix proportion. The most main component of fiber in glass fiber composite material (GFRP) is SiO 2 And Al 2 O 3 When the GFRP is crushed to 40-50 microns, silicon-oxygen tetrahedrons and aluminum-oxygen tetrahedrons can be released in an alkali environment, and a proper amount of epoxy resin particles can not only fill gaps in the cementing material, but also form polymer bridges among geopolymer products, relieve internal stress caused by load and play a toughening role; however, the strength of the single alkali-activated recycled GFRP powder cementing material is low under normal-temperature curing, and meanwhile, the pure slag geopolymer cementing material has strong early reaction activity, is easy to flash and coagulate to influence construction, is easy to shrink to generate shrinkage cracks to influence practical engineering application of the pure slag geopolymer cementing material, so that the recycled GFRP powder can be used for partially replacing slag to generate a gelled body under the alkali-activated action to replace a cement type cementing material.
The recovered GFRP powder and slag binary geopolymer cementing material can be used as a wall repair material, if necessary, the recovered GFRP powder and slag binary geopolymer cementing material can be applied to geopolymer concrete in the future and can replace common silicate concrete in engineering application.
The invention has the beneficial effects that:
1) Strong designability
The recovered GFRP powder and the binary geopolymer of the slag can fully utilize the alkali excitation activity of aluminosilicate fibers, improve the flash coagulation property of the geopolymer of the slag, make up for the characteristic of slow reaction of the recovered GFRP powder at room temperature, and form a composite gelling system with the synergistic work of the two and fully exerted performance.
2) Performance optimization
The invention obtains the optimal proportion of GFRP powder/slag geopolymer. When the GFRP powder is recycled for 30% to replace slag, the fluidity, the initial setting time and the final setting time of the cementing material are respectively 202mm, 148min and 155min, the problem of instantaneous setting of slag geopolymer is met with GB175-2007 general Portland cement, the problem of instantaneous setting of slag geopolymer is solved, the compressive strength and the flexural strength of the cementing material are improved to a certain extent compared with the slag geopolymer without the GFRP powder, and the flexural strength is improved by more than 30%;
3) Energy-saving and environment-friendly
The recovered GFRP powder does not need to be subjected to fiber and resin separation, a gel is generated under the alkali excitation effect, a cement type cementing material is replaced, the problems of difficult GFRP recovery and utilization and the like can be effectively solved, and the innovation, coordination and green concept of economic development in China is met.
Drawings
FIG. 1 is a graph showing the operational performance of the recovered GFRP powder and slag binary geopolymer cement with varying GFRP content;
FIG. 2 is a graph showing the mechanical properties of recovered GFRP powder and slag binary geopolymer cement with varying GFRP content;
FIG. 3 is an X-ray diffraction pattern showing the change of GFRP content of the recovered GFRP powder and slag binary geopolymer cement.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
Example 1: in the recovered GFRP powder and slag binary geopolymer gelled material, the weight percentage of the recovered GFRP powder is 17.7% (mass ratio to slag is 3.
As shown in the working property test of fig. 1, the fluidity of the alkali-activated cement having a mass ratio of GFRP powder to slag of 3; initial setting time and final setting time are extended by 30%, while the fluidity of alkali-activated GFRP-only powder geopolymer cement is increased by 35% and the initial setting time and final setting time are extended by 22% and 260%, respectively, compared with 30% GFRP-containing alkali-activated cement
As shown in the mechanical property test of FIG. 2 with the curing age of 28d, the compressive strength and the flexural strength of the alkali-activated cementing material both increase and decrease with the increase of the content of the GFRP powder. When the GFRP powder content was increased from 0 to 30%, the compressive strength of the alkali-activated GFRP powder-slag geopolymer cement was increased by 10% and the flexural strength thereof was increased by 32% as compared with the single-slag geopolymer cement.
Example 2: in the recovered GFRP powder and slag binary geopolymer gelled material, the weight percentage of the recovered GFRP powder is 29.41 percent (50 percent of the mass of the precursor material), the weight percentage of the slag is 29.41 percent, the weight percentage of the alkali-activated solution is 41.1 percent, the concentration of the alkali-activated solution is 80 percent, the modulus of the alkali-activated solution is 1.5, and the liquid-solid ratio is 0.7.
As shown in the working property test of FIG. 1, the fluidity of the alkali-activated cement containing 50% GFRP was improved by 21% as compared with the alkali-activated slag cement not containing GFRP; the initial setting time and the final setting time are respectively prolonged by 31 percent and 38 percent,
as shown in FIG. 2, the mechanical properties of the GFRP powder at age of 28d increased from 30% to 50%, the compressive strength and the flexural strength began to decrease by 30% and 13%, respectively.
Example 3: in the recovered GFRP powder and slag binary geopolymer gelled material, the weight percentage of the recovered GFRP powder is 41.18 percent (70 percent of the mass of the precursor material), the weight percentage of the slag is 17.65 percent, the weight percentage of the alkali excitation solution is 41.1 percent, the concentration of the alkali excitation solution is 80 percent, the modulus of the alkali excitation solution is 1.5, and the liquid-solid ratio is 0.7.
As shown in the workability test of FIG. 1, the fluidity of the alkali-activated cement containing 70% GFRP was improved by 29.8% as compared with the alkali-activated slag cement not containing GFRP; the initial setting time and the final setting time are respectively prolonged by 33.3 percent and 38.7 percent,
as shown in the mechanical property test of FIG. 2 with the curing age of 28d, when the content of the GFRP powder is increased from 30% to 70%, the compressive strength and the breaking strength of the alkali-activated GFRP composite cementing material are respectively reduced by 40% and 31%.
FIG. 3 is an XRD pattern of the recovered GFRP powder and slag binary geopolymer cement after curing for 28 days at different GFRP contents (0%, 30%, 50%, 70%). As can be observed from the figure, calcite (CaCO) is present in the reaction system of the alkali-activated GFRP-slag composite cementitious material in the range of 20 to 35 DEG 3 ) Calcium silicate hydrate (Ca) 5 (Si 6 O 16 )(OH) 2 ·4H 2 O) and small amounts of unreacted SiO 2 . At around 30 and 50 deg，CaCO 3 With Ca 5 (Si 6 O 16 )(OH) 2 ·4H 2 There is a large overlap of diffraction peaks for hydration products such as O. The pure slag geopolymer cementing material with the curing age of 28d has more microcracks, the geopolymer cementing material partially replacing slag with 30% recovered GFRP powder is denser in microscopic morphology compared with the pure slag geopolymer cementing material, the surface of a geopolymer matrix is covered by a large amount of gel, the microstructure of the pure recovered GFRP powder cementing material is looser, and meanwhile, more powdery particles are still on the surface.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the invention.
Claims (5)
1. A base polymer cementing material for recycling GFRP powder and slag is characterized in that: comprises the following components in percentage by weight:
recovering 5 to 42 percent of GFRP powder,
17 to 53 percent of slag,
40 to 47 percent of alkali-activated solution,
wherein 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 0.7-0.9.
2. The recycled GFRP powder and slag-based geopolymer cement of claim 1 wherein: the weight percentage of the recovered GFRP powder was 17.7%, the weight percentage of slag was 41.2%, the weight percentage of alkali-excited solution was 41.1%, and the concentration of alkali-excited solution was 80%; the modulus of the alkali-activated solution is 1.5; the liquid-solid ratio was 0.7.
3. The recycled GFRP powder and slag-based geopolymer cement of claim 1 wherein: d of the recovered GFRP powder 50 D of slag not exceeding 14 μm 50 Not more than 12 μm, wherein d 50 The particle size is 50% of the cumulative particle distribution.
4. The recycled GFRP powder and slag based geopolymer cement of claim 1, wherein: the alkali-activated solution is prepared by adding sodium hydroxide solution into sodium silicate solution to adjust the sodium hydroxide solution to a design modulus.
5. The method for producing a recycled GFRP powder and slag-based geopolymer binder according to claim 1, 2, 3 or 4, wherein: the method comprises the following steps:
1) Firstly, pouring GFRP powder and slag in percentage by weight into a planetary cement mortar stirrer, and performing low-speed dry stirring for 1min;
2) Then injecting the alkali-activated solution prepared one day in advance into the solution, and stirring the solution at a low speed for 2min; stirring at high speed for 3min;
3) Molding immediately after stirring, fixing a 40X 160mm mold on a compaction table, and filling the cementing material into the mold twice; compacting and molding on a cement mortar vibration table, scraping the surface, and covering a preservative film on the surface to prevent moisture evaporation;
4) Standing at room temperature for one day, demolding, placing into a standard curing room, and curing to corresponding age.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210093077.2A CN114276034B (en) | 2022-01-26 | 2022-01-26 | Base polymer cementing material for recycling GFRP powder and slag and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210093077.2A CN114276034B (en) | 2022-01-26 | 2022-01-26 | Base polymer cementing material for recycling GFRP powder and slag and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114276034A CN114276034A (en) | 2022-04-05 |
| CN114276034B true CN114276034B (en) | 2022-12-20 |
Family
ID=80882028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210093077.2A Active CN114276034B (en) | 2022-01-26 | 2022-01-26 | Base polymer cementing material for recycling GFRP powder and slag and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114276034B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2666253B1 (en) * | 1990-09-04 | 1992-10-30 | Davidovits Joseph | PROCESS FOR OBTAINING A GEOPOLYMERIC BINDER FOR STABILIZATION, SOLIDIFICATION AND CONSOLIDATION OF TOXIC WASTE. |
| CN110357462A (en) * | 2019-07-29 | 2019-10-22 | 南京工业大学 | A kind of slag based dried powder ground polymers and preparation method and application |
| CN111718159B (en) * | 2020-07-01 | 2022-04-26 | 南京工业大学 | Recycled FRP powder geopolymer concrete and preparation method thereof |
| CN112694292B (en) * | 2021-01-22 | 2022-11-08 | 太原理工大学 | Low-shrinkage high-strength red mud-slag geopolymer and preparation method thereof |
-
2022
- 2022-01-26 CN CN202210093077.2A patent/CN114276034B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114276034A (en) | 2022-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108640547B (en) | Iron tailing/metakaolin based geopolymer and preparation method thereof | |
| CN103319129B (en) | Ecological nanoparticle reinforced cement based composite material and preparation method thereof | |
| CN102336550B (en) | Non-steamed brick and preparation method thereof | |
| CN113321467B (en) | Internal curing low-shrinkage lightweight aggregate ultrahigh-performance concrete and preparation method thereof | |
| CN107337400B (en) | Ground coal gasification coarse slag cement-based antique material and preparation method and application thereof | |
| CN111170698B (en) | Regenerated glass fiber reinforced plastic anti-crack thermal insulation mortar and preparation and construction methods thereof | |
| CN114380518B (en) | Bayer process red mud-phosphogypsum baking-free cementing material and preparation method thereof | |
| CN112331276B (en) | High-performance recycled concrete mix proportion design method | |
| CN111718159B (en) | Recycled FRP powder geopolymer concrete and preparation method thereof | |
| CN111423164A (en) | Whisker toughening and reinforcing geopolymer and preparation method thereof | |
| CN113800829A (en) | Early-strength type ultrahigh-ductility geopolymer concrete material and preparation method thereof | |
| CN111635171A (en) | Fly ash-based polymer mortar repair material and preparation method thereof | |
| CN114790096A (en) | Solidified sludge block reinforced by waste glass fiber reinforced plastics and preparation method thereof | |
| CN114276034B (en) | Base polymer cementing material for recycling GFRP powder and slag and preparation method thereof | |
| CN112408875A (en) | Regenerated geopolymer mortar and preparation method and application thereof | |
| CN111268988A (en) | High-water-resistance calcination-free phosphogypsum-based slope building block material and preparation thereof | |
| CN114772974A (en) | Concrete residual material nano regeneration treatment agent, preparation method and application thereof | |
| CN109928695B (en) | Low-heat recycled large-aggregate concrete and preparation method thereof | |
| CN113773001A (en) | Geopolymer material containing iron ore tailings powder and granite stone powder and preparation method thereof | |
| CN112624710A (en) | High-strength recycled concrete and preparation method thereof | |
| CN112608112A (en) | Anti-cracking alkali slag recycled concrete and preparation method thereof | |
| CN113173744A (en) | Method for preparing geopolymer-based non-pressed water permeable brick through natural curing at normal temperature | |
| Fan | A brief introduction on the research status and future prospects on geopolymer concrete | |
| CN111205005A (en) | Cementing material, application and concrete | |
| CN113461391A (en) | Efficient utilization technology for bulk solid waste material resources |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |