Compression-resistant geopolymer material containing PVA (Polyvinyl Alcohol) fiber and preparation method of compression-resistant geopolymer material

Abstract

The invention discloses a pressure-resistant geopolymer material containing PVA fiber and a preparation method thereof, and relates to the technical field of geopolymer, the preparation method comprises the following steps: adding PVA fiber into hydrogen peroxide, heating and stirring, filtering, washing, and drying to obtain pretreated PVA fiber; adding the modified PVA fiber into deionized water, performing ultrasonic dispersion, sequentially adding fly ash, blast furnace slag, silica fume, metakaolin, an alkali activator and the rest deionized water, uniformly stirring, pouring the mixture into a mold, compacting, vibrating, demolding and curing to obtain the compression-resistant geopolymer material. The modified PVA fiber is obtained by coating PVA fiber with sol and grafting and copolymerizing an acrylate monomer; the acrylate monomer comprises N-[3-(dimethylamino) propyl] acrylamide, a sodium p-styrenesulfonate hydrate and itaconic acid; the sol-coated PVA fiber is prepared by coating PVA fiber with aluminum oxide sol and silicon dioxide sol.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of geopolymer, in particular to a compression-resistant geopolymer material containing PVA fibers and a preparation method thereof. BACKGROUND

[0002] The high temperature of deep strata can cause the degradation and group change of polymer admixtures (retarder, dispersant, etc.) in the geopolymer slurry, thereby seriously deteriorating the comprehensive performance of the slurry (such as poor setting stability, weak suspension stability, and excessive filtration loss, etc.), posing a serious threat to the safety and quality of construction.

[0003] The organic / inorganic hybrid admixture can effectively inhibit the thermal degradation and thinning phenomenon of traditional chain molecular structure copolymer admixtures, and maintain its use efficiency under high temperature conditions. However, due to the limited number of hydroxyl groups on the surface of PVA fibers and the low hydrophilicity leading to difficult dispersion, the traditional modification method generally has the problems of low grafting efficiency and difficult control.

[0004] Therefore, how to improve the grafting efficiency of the PVA fiber surface admixture and apply it to the preparation process of the geopolymer material needs to be solved urgently. SUMMARY

[0005] The present application relates to the technical field of geopolymer, in particular to a compression-resistant geopolymer material containing PVA fibers and a preparation method thereof.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: A preparation method of a compression-resistant geopolymer material containing PVA fibers, comprising the following steps: S1: adding PVA fibers into 5wt% hydrogen peroxide, heating to 45-50℃, stirring for 2-2.5h, filtering, washing, and drying to obtain pretreated PVA fibers; S2: adding modified PVA fibers into 50wt% required deionized water, ultrasonic dispersion, sequentially adding fly ash, blast furnace slag, silica fume, metakaolin, alkali activator, and the remaining 50wt% required deionized water, stirring uniformly, pouring the mixture into a mold, compacting, vibrating, demolding, curing to obtain a compression-resistant geopolymer material; Further, the modified PVA fibers are obtained by coating PVA fibers with sol to graft copolymerize acrylate monomers; Further, the acrylate monomers include N-[3-(dimethylamino)propyl] acrylamide, sodium p-styrenesulfonate hydrate, and itaconic acid; Further, the PVA fibers coated with sol are prepared by coating PVA fibers with alumina sol and silica sol.

[0007] Further, the anti-pressure polymer material is prepared by the following components: fly ash 120-180 parts, blast furnace slag 80-100 parts, silica ash 40-60 parts, metakaolin 360-420 parts, alkali activator 100-150 parts, and deionized water 100-120 parts.

[0008] Further, the modified PVA fiber is prepared by the following steps. The sol-coated PVA fiber is added into deionized water and ultrasonically dispersed, and then N-[3-(dimethylamino)propyl] acrylamide and sodium p-styrenesulfonate hydrate are added under nitrogen atmosphere, and the mixture is heated to 50-55 DEG C and stirred uniformly, and then itaconic acid and potassium persulfate are added, and the mixture is heated to 90-92 DEG C and reacted for 3-3.5 h to obtain the modified PVA fiber.

[0009] Further, the molar ratio of N-[3-(dimethylamino)propyl] acrylamide, sodium p-styrenesulfonate hydrate and itaconic acid is 0.05:0.1:0.5.

[0010] Further, the sol-coated PVA fiber is added in an amount of 5-8 wt% of the total mass of the acrylate monomers, and the potassium persulfate is added in an amount of 1-2 wt% of the total mass of the acrylate monomers.

[0011] Further, the sol-coated PVA fiber is prepared by the following steps. The pretreated PVA fiber is added into an ethanol aqueous solution with a volume ratio of 7:3, and an aluminum isopropoxide and acetylacetone ethanol solution is added, and the mixture is heated to 50-55 DEG C and stirred uniformly, and then heated to 85-86 DEG C, and the pH is adjusted to 5 by using hydrochloric acid, and then heated to 93-97 DEG C, and reacted for 30-45 min, and then tetraethyl orthosilicate and vinyltriethoxysiloxane ethanol solution is added, and the pH is adjusted to 5 by using hydrochloric acid, and then heated to 29-31 DEG C, and reacted for 24 h, and then aged at room temperature, and then dried at 110-115 DEG C to obtain the sol-coated PVA fiber.

[0012] Further, in the preparation process of the sol-coated PVA fiber, the mass ratio of aluminum isopropoxide to acetylacetone is 10:(0.8-1.2), and the mass ratio of tetraethyl orthosilicate to vinyltriethoxysiloxane is (2-3):(1-2).

[0013] Further, in the preparation process of the sol-coated PVA fiber, the molar ratio of aluminum isopropoxide to the total molar amount of tetraethyl orthosilicate and vinyltriethoxysiloxane is 0.8:1.

[0014] Compared with the prior art, the present application has the following beneficial effects: 1、The application is different from the adding mode of traditional reinforcing agent (adding nano-silicon dioxide particles, nano-aluminum oxide particles and PVA fibers directly into geopolymer for blending), Al-OH groups are generated by hydrolysis of aluminum isopropoxide under the action of acid catalyst, and the aluminum oxide sol particles are formed by condensation reaction; tetraethyl orthosilicate and vinyl triethoxysiloxane are mixed with the aluminum oxide sol, under the action of an acidic catalyst, the groups generated by hydrolysis of the tetraethyl orthosilicate and vinyl triethoxysiloxane and the aluminum oxide sol particles occur co-condensation reaction, and a composite sol structure is formed to coat the surface of the PVA fibers, thus the sol-coated PVA fibers are prepared; on the one hand, the dispersibility and compatibility of the PVA fibers in the geopolymer are improved, the Al2O3·2SiO2 sol provides an aluminosilicate skeleton for the amorphous network structure of the geopolymer, can control the network density and pore structure, and improve the compressive performance of the geopolymer material; on the other hand, the aluminosilicate network has alkali resistance, avoids the dissolution problem of silica gel at high pH, the structure is not easy to decompose at high temperature, and the sol-coated PVA fibers provide high mechanical strength, ensure that the retention time and column efficiency do not have significant drift in long-term use; at the same time, the double bond is introduced into the surface of the PVA fibers, which lays the foundation for subsequent grafting of polymer admixtures.

[0015] 2, N-[3-(dimethylamino)propyl]acrylamide, sodium p-styrene sulfonate hydrate and itaconic acid are used as monomers for copolymerization and grafting on the surface of the sol PVA fibers, the polymer retarder is introduced into the PVA fibers, the preparation of organic / inorganic hybrid admixtures is realized, and the problems of poor dispersibility of traditional reinforcing agent added alone, degradation and group change of polymer admixtures at high temperature are solved; first, sodium p-styrene sulfonate hydrate and itaconic acid can retain the moisture in the cement paste, and maintain the workability at high temperature; second, the sulfonic acid group in sodium p-styrene sulfonate hydrate forms a protective layer on the surface of the cement particles, prevents them from premature contact with water molecules, and delays early hydration; then, the amine group in the polymer and the anion group produce electrostatic repulsion, prevent the early flocculation of cement particles, promote the formation of more uniform and dense N-A-S-H gel, and further improve the mechanical strength and density of the geopolymer material. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the application will be described below clearly and completely. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0017] In the following embodiments, the PVA fiber has an elastic modulus of 130 GPa and a length of 12 mm; the remaining raw materials are commercially available.

[0018] Embodiment 1: A method for preparing a compressive geopolymer material containing PVA fibers, comprising the following steps: S1: adding PVA fibers into 5wt% hydrogen peroxide, heating to 45℃, stirring for 2h, filtering, washing, drying, to obtain pretreated PVA fibers; S2: adding pretreated PVA fibers into an ethanol aqueous solution with a volume ratio of 7:3, adding 10g aluminum isopropoxide, 0.8g acetylacetone ethanol solution, heating to 50℃, stirring uniformly, heating to 85℃, adjusting pH to 5 using hydrochloric acid, heating to 93℃, reacting for 30min, adding 16g tetraethyl orthosilicate, 8g vinyl triethoxysiloxane ethanol solution, adjusting pH to 5 using hydrochloric acid, heating to 29℃, reacting for 24h, aging at room temperature, drying at 110℃, to obtain sol-coated PVA fibers; S3: adding 5wt% sol-coated PVA fibers into deionized water, ultrasonic dispersion, adding 0.05mol N-[3-(dimethylamino)propyl]acrylamide, 0.1mol sodium p-styrenesulfonate hydrate under nitrogen atmosphere, heating to 50℃, stirring uniformly, adding 0.5mol itaconic acid, 1wt% potassium persulfate, heating to 90℃ for 3h, to obtain modified PVA fibers; S4: adding 0.9wt% modified PVA fibers into 50 parts of required deionized water, ultrasonic dispersion, adding 120 parts of fly ash, 80 parts of blast furnace slag, 40 parts of silica fume, 360 parts of metakaolin, 100 parts of alkali activator and the remaining 50 parts of required deionized water in sequence, stirring uniformly, pouring the mixture into a mold, compacting, vibrating, demolding, curing, to obtain a compressive geopolymer material.

[0019] Embodiment 2: A method for preparing a compressive geopolymer material containing PVA fibers, comprising the following steps: S1: adding PVA fibers into 5wt% hydrogen peroxide, heating to 45℃, stirring for 2h, filtering, washing, drying, to obtain pretreated PVA fibers; S2: adding pretreated PVA fibers into an ethanol aqueous solution with a volume ratio of 7:3, adding 10g aluminum isopropoxide, 0.8g acetylacetone ethanol solution, heating to 50℃, stirring uniformly, heating to 85℃, adjusting pH to 5 using hydrochloric acid, heating to 93℃, reacting for 30min, adding 14.4g tetraethyl orthosilicate, 9.6g vinyl triethoxysiloxane ethanol solution, adjusting pH to 5 using hydrochloric acid, heating to 29℃, reacting for 24h, aging at room temperature, drying at 110℃, to obtain sol-coated PVA fibers; S3: 5wt% sol-coated PVA fiber was added into deionized water and ultrasonically dispersed. Under a nitrogen atmosphere, 0.05 mol N-[3-(dimethylamino)propyl] acrylamide and 0.1 mol sodium p-styrenesulfonate hydrate were added. The mixture was heated to 50°C and stirred uniformly. Then, 0.5 mol itaconic acid and 1wt% potassium persulfate were added. The mixture was heated to 90°C and reacted for 3h to obtain modified PVA fiber. S4: 0.9wt% modified PVA fiber was added into 50 parts of deionized water and ultrasonically dispersed. Then, 120 parts of fly ash, 80 parts of blast furnace slag, 40 parts of silica fume, 360 parts of metakaolin, 100 parts of alkali activator and the remaining 50 parts of deionized water were added in sequence. The mixture was stirred uniformly, poured into a mold, compacted, vibrated, demolded, cured to obtain a compressive geopolymer material.

[0020] Example 3: A preparation method of a compressive geopolymer material containing PVA fiber, comprising the following steps: S1: PVA fiber was added into 5wt% hydrogen peroxide, heated to 45°C, stirred for 2h, filtered, washed, dried to obtain pretreated PVA fiber; S2: The pretreated PVA fiber was added into an ethanol-water solution with a volume ratio of 7:3. 10g aluminum isopropoxide and 0.8g acetylacetone ethanol solution were added. The mixture was heated to 50°C and stirred uniformly. Then, the mixture was heated to 85°C, the pH was adjusted to 5 using hydrochloric acid, heated to 93°C, reacted for 30min, 14.4g tetraethyl orthosilicate and 9.6g vinyltriethoxysiloxane ethanol solution were added, the pH was adjusted to 5 using hydrochloric acid, heated to 29°C, reacted for 24h, aged at room temperature, dried at 110°C to obtain sol-coated PVA fiber; S3: 8wt% sol-coated PVA fiber was added into deionized water and ultrasonically dispersed. Under a nitrogen atmosphere, 0.05 mol N-[3-(dimethylamino)propyl] acrylamide and 0.1 mol sodium p-styrenesulfonate hydrate were added. The mixture was heated to 50°C and stirred uniformly. Then, 0.5 mol itaconic acid and 1wt% potassium persulfate were added. The mixture was heated to 90°C and reacted for 3h to obtain modified PVA fiber; S4: 0.9wt% modified PVA fiber was added into 50 parts of deionized water and ultrasonically dispersed. Then, 120 parts of fly ash, 80 parts of blast furnace slag, 40 parts of silica fume, 360 parts of metakaolin, 100 parts of alkali activator and the remaining 50 parts of deionized water were added in sequence. The mixture was stirred uniformly, poured into a mold, compacted, vibrated, demolded, cured to obtain a compressive geopolymer material.

[0021] Example 4: A preparation method of a compressive geopolymer material containing PVA fiber, comprising the following steps: S1: PVA fiber was added into 5wt% hydrogen peroxide, heated to 45°C, stirred for 2h, filtered, washed, dried to obtain pretreated PVA fiber; S2: The pretreated PVA fiber is added to an ethanol aqueous solution with a volume ratio of 7:3, 10 g of aluminum isopropoxide and 0.8 g of an ethanol solution of acetylacetone are added, heated to 50°C, stirred uniformly, heated to 85°C, the pH is adjusted to 5 using hydrochloric acid, heated to 93°C, reacted for 30 min, 14.4 g of tetraethyl orthosilicate and 9.6 g of an ethanol solution of vinyltriethoxysiloxane are added, the pH is adjusted to 5 using hydrochloric acid, heated to 29°C, reacted for 24 h, aged at room temperature, dried at 110°C, and a sol-coated PVA fiber is obtained; S3: 8 wt% of the sol-coated PVA fiber is added to deionized water and ultrasonically dispersed, 0.05 mol of N-[3-(dimethylamino)propyl]acrylamide and 0.1 mol of sodium p-styrenesulfonate hydrate are added under a nitrogen atmosphere, heated to 50°C, stirred uniformly, 0.5 mol of itaconic acid and 1 wt% of potassium persulfate are added, heated to 90°C and reacted for 3 h, and a modified PVA fiber is obtained; S4: 1.2 wt% of the modified PVA fiber is added to 50 parts of the required deionized water and ultrasonically dispersed, 120 parts of fly ash, 80 parts of blast furnace slag, 40 parts of silica fume, 360 parts of metakaolin, 100 parts of alkali activator and the remaining 50 parts of the required deionized water are sequentially added, stirred uniformly, the mixture is poured into a mold, compacted, vibrated, demolded, cured, and a compressive geopolymer material is obtained.

[0022] Comparative Example 1: A method for preparing a compressive geopolymer material containing a PVA fiber includes the following steps: S1: The PVA fiber is added to 5 wt% hydrogen peroxide, heated to 45°C, stirred for 2 h, filtered, washed, dried, and pretreated PVA fiber is obtained; S2: The pretreated PVA fiber is added to an ethanol aqueous solution with a volume ratio of 7:3, 10 g of aluminum isopropoxide and 0.8 g of an ethanol solution of acetylacetone are added, heated to 50°C, stirred uniformly, heated to 85°C, the pH is adjusted to 5 using hydrochloric acid, heated to 93°C, reacted for 30 min, room temperature aging, dried at 110°C, and a sol-coated PVA fiber is obtained; S3: 0.05 mol of N-[3-(dimethylamino)propyl]acrylamide and 0.1 mol of sodium p-styrenesulfonate hydrate are added under a nitrogen atmosphere, heated to 50°C, stirred uniformly, 0.5 mol of itaconic acid and 1 wt% of potassium persulfate are added, heated to 90°C and reacted for 3 h, and a polymer is obtained; S4: 0.9 wt% of the modified PVA fiber and 0.9 wt% of the polymer are added to 50 parts of the required deionized water and ultrasonically dispersed, 120 parts of fly ash, 80 parts of blast furnace slag, 40 parts of silica fume, 360 parts of metakaolin, 100 parts of alkali activator and the remaining 50 parts of the required deionized water are sequentially added, stirred uniformly, the mixture is poured into a mold, compacted, vibrated, demolded, cured, and a compressive geopolymer material is obtained.

[0023] Preparation method of a compression-resistant geopolymer material containing PVA fibers, comprising the following steps: S1: adding PVA fibers into 5wt% hydrogen peroxide, heating to 45℃, stirring for 2h, filtering, washing, drying, obtaining pretreated PVA fibers; S2: adding pretreated PVA fibers into an ethanol aqueous solution with a volume ratio of 7:3, adding 16g tetraethyl orthosilicate, 8g vinyl triethoxysiloxane ethanol solution, using hydrochloric acid to adjust pH to 5, heating to 29℃, reacting for 24h, aging at room temperature, drying at 110℃, obtaining sol-coated PVA fibers; S3: adding 5wt% sol-coated PVA fibers into deionized water, ultrasonic dispersion, adding 0.05mol N-[3-(dimethylamino)propyl]acrylamide, 0.1mol sodium p-styrenesulfonate hydrate under nitrogen atmosphere, heating to 50℃, stirring uniformly, adding 0.5mol itaconic acid, 1wt% potassium persulfate, heating to 90℃, reacting for 3h, obtaining modified PVA fibers; S4: adding 0.9wt% modified PVA fibers into 50 parts of required deionized water, ultrasonic dispersion, sequentially adding 120 parts of fly ash, 80 parts of blast furnace slag, 40 parts of silica fume, 360 parts of metakaolin, 100 parts of alkali activator and the remaining 50 parts of required deionized water, stirring uniformly, pouring the mixture into a mold, compacting, vibrating, demolding, curing, obtaining a compression-resistant geopolymer material.

[0024] Preparation method of a compression-resistant geopolymer material containing PVA fibers, comprising the following steps: S1: adding PVA fibers into 5wt% hydrogen peroxide, heating to 45℃, stirring for 2h, filtering, washing, drying, obtaining pretreated PVA fibers; S2: adding pretreated PVA fibers into an ethanol aqueous solution with a volume ratio of 7:3, adding 16g tetraethyl orthosilicate, 8g vinyl triethoxysiloxane ethanol solution, using hydrochloric acid to adjust pH to 5, heating to 29℃, reacting for 24h, aging at room temperature, drying at 110℃, obtaining sol-coated PVA fibers; S3: adding 5wt% sol-coated PVA fibers into deionized water, ultrasonic dispersion, adding 0.05mol N-[3-(dimethylamino)propyl]acrylamide, 0.1mol sodium p-styrenesulfonate hydrate under nitrogen atmosphere, heating to 50℃, stirring uniformly, adding 0.5mol itaconic acid, 1wt% potassium persulfate, heating to 90℃, reacting for 3h, obtaining modified PVA fibers;

[0025] Preparation method of a compression-resistant geopolymer material containing PVA fibers, comprising the following steps: S1: adding PVA fibers into 5wt% hydrogen peroxide, heating to 45℃, stirring for 2h, filtering, washing, drying, to obtain pretreated PVA fibers; S2: under a nitrogen atmosphere, adding 0.05mol N-[3-(dimethylamino)propyl] acrylamide, 0.1mol sodium p-styrenesulfonate hydrate, heating to 50℃, stirring uniformly, adding 0.5mol itaconic acid, 1wt% potassium persulfate, heating to 90℃ for 3h, to obtain a polymer; S3: adding 0.9wt% pretreated PVA fibers, 0.9wt% polymer into 50 parts of required deionized water, ultrasonic dispersion, sequentially adding 120 parts of fly ash, 80 parts of blast furnace slag, 40 parts of silica fume, 360 parts of metakaolin, 100 parts of alkali activator and the remaining 50 parts of required deionized water, stirring uniformly, pouring the mixture into a mold, compacting, vibrating, demolding, curing, to obtain a compression-resistant geopolymer material.

[0026] Experiment: compression strength test: pour the mixture prepared in the above examples and comparative examples into a mold, respectively curing and solidifying at 100MPa, 180℃ high-temperature environment for 1d, 60℃ environment for 1d, to test the compression strength performance.

[0027] The experimental results are shown in Table 1 below.

[0028] Table 1: Geopolymer material performance test data table

[0029] Conclusion: the geopolymer material prepared by the present application has excellent high-temperature resistance and compression strength performance.

[0030] Comparative example 1 only coats PVA fibers with alumina sol, and adds the polymer as an additive into the preparation process of the geopolymer, which causes the polymer additive to degrade and change groups at high temperature, and lacks the alumino-silicate skeleton provided by the amorphous network structure of the silica sol and alumina sol, resulting in reduced performance of the geopolymer material.

[0031] Comparative example 2 only coats PVA fibers with silica sol, which lacks the alumino-silicate skeleton provided by the amorphous network structure of the silica sol and alumina sol, resulting in reduced performance of the geopolymer material.

[0032] Comparative example 3 does not graft the polymer onto the surface of the sol-coated PVA fibers, but adds it as an additive into the preparation process of the geopolymer, which causes the polymer additive to degrade and change groups at high temperature, resulting in reduced performance of the geopolymer material.

[0033] The comparative example 4 does not modify the PVA fiber with sol coating, and adds the polymer as an additive into the preparation process of the geopolymer, which leads to the degradation and group change of the polymer additive at high temperature, and the lack of the alumino-silicate skeleton provided by the amorphous network structure of the silica sol and the alumina sol, which leads to the performance reduction of the geopolymer material.

[0034] It will be apparent to those skilled in the art that the application is not limited to the details of the above-exemplified embodiments and that the present application can be implemented in other particular forms without departing from the spirit or essential characteristics thereof. The embodiments should therefore be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the above description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A process for the production of a compression-resistant geopolymer material containing PVA fibres, characterised in that: The method comprises the following steps: S1: adding PVA fibers into hydrogen peroxide, heating to 45-50℃, stirring for 2-2.5h, filtering, washing, and drying to obtain pretreated PVA fibers; S2: adding modified PVA fibers into 50wt% required deionized water, ultrasonic dispersion, sequentially adding fly ash, blast furnace slag, silica ash, metakaolin, alkali activator, and the remaining 50wt% required deionized water, stirring uniformly, pouring the mixture into a mold, compacting, vibrating, demolding, curing to obtain a compression-resistant geopolymer material; The modified PVA fibers are obtained by sol-coating PVA fibers to graft copolymerize acrylate monomers; The acrylate monomers include N-[3-(dimethylamino)propyl] acrylamide, sodium p-styrenesulfonate hydrate, and itaconic acid; The sol-coated PVA fibers are prepared by coating PVA fibers with alumina sol and silica sol.

2. A process for the production of a compression-resistant geopolymer material containing PVA fibres according to claim 1, characterised in that: In the preparation process of the compression-resistant geopolymer material, the proportions of the components include, by mass fraction: fly ash 120-180 parts, blast furnace slag 80-100 parts, silica ash 40-60 parts, metakaolin 360-420 parts, alkali activator 100-150 parts, and deionized water 100-120 parts; the amount of the modified PVA fibers added is 0.9-1.2wt%.

3. A process for the production of a compression-resistant geopolymer material containing PVA fibres according to claim 1, characterised in that: The preparation method of the modified PVA fibers comprises the following steps: adding sol-coated PVA fibers into deionized water, ultrasonic dispersion, adding N-[3-(dimethylamino)propyl] acrylamide and sodium p-styrenesulfonate hydrate under a nitrogen atmosphere, heating to 50-55℃, stirring uniformly, adding itaconic acid and potassium persulfate, heating to 90-92℃ and reacting for 3-3.5h to obtain modified PVA fibers.

4. A process for the production of a compression-resistant geopolymer material containing PVA fibres according to claim 3, characterised in that: In the preparation process of the modified PVA fibers, the molar ratio of N-[3-(dimethylamino)propyl] acrylamide:sodium p-styrenesulfonate hydrate:itaconic acid is 0.05:0.1:0.

5.

5. A process for the production of a compression-resistant geopolymer material containing PVA fibres according to claim 3, characterised in that: The amount of the sol-coated PVA fibers added is 5-8wt% of the total mass of the acrylate monomers; the amount of potassium persulfate added is 1-2wt% of the total mass of the acrylate monomers.

6. A process for the production of a compression-resistant geopolymer material containing PVA fibres according to claim 3, characterised in that: The preparation method of the sol-coated PVA fibers comprises the following steps: adding pretreated PVA fibers into an aqueous ethanol solution, adding an aluminum isopropoxide-acetylacetone ethanol solution, heating to 50-55℃, stirring uniformly, heating to 85-86℃, adjusting the pH to 5, heating to 93-97℃, reacting for 30-45min, adding a tetraethyl orthosilicate-vinyltriethoxysiloxane ethanol solution, adjusting the pH to 5, heating to 29-31℃, reacting for 24h, aging at room temperature, and drying at 110-115℃ to obtain sol-coated PVA fibers.

7. A process for the production of a compression-resistant geopolymer material containing PVA fibres according to claim 6, characterised in that: In the preparation process of the sol-coated PVA fibers, the mass ratio of aluminum isopropoxide:acetylacetone is 10:(0.8-1.2); the mass ratio of tetraethyl orthosilicate:vinyltriethoxysiloxane is (2-3):(1-2).

8. A process for the production of a compression-resistant geopolymer material containing PVA fibres according to claim 6, characterised in that: In the preparation process of the sol-coated PVA fibers, the molar ratio of aluminum isopropoxide:total moles of tetraethyl orthosilicate and vinyltriethoxysiloxane is 0.8:

1.

9. A compression-resistant geopolymer material according to any one of claims 1 to 8, when prepared according to the method of claim 9.

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