Ultrahigh-performance geopolymer concrete and preparation method thereof

Abstract

The invention belongs to the technical field of concrete, and particularly relates to ultrahigh-performance geopolymer concrete and a preparation method thereof. The ultrahigh-performance geopolymer concrete provided by the invention is prepared from the following components in parts by weight: 750 to 770 parts of slag, 20 to 130 parts of fly ash, 20 to 130 parts of dechlorinated and detoxified waste incineration fly ash, 20 to 130 parts of waste glass powder, 20 to 130 parts of waste limestone powder, 49 to 51 parts of silica fume, 486 to 497 parts of alkali activator, 989 to 1011 parts of quartz sand, 127.5 to 150.5 parts of mixed reinforced fiber and 5 to 10 parts of water reducing agent, the mixed reinforced fibers comprise copper-plated hard straight steel fibers and flexible basalt fibers. According to the invention, high strength, high toughness and excellent durability are ensured, and the advantages of low cost, good environmental protection property and sustainable development are achieved.

Description

Technical Field

[0001] This invention belongs to the field of concrete technology, and particularly relates to an ultra-high performance geopolymer concrete and its preparation method. Background Technology

[0002] Ultra-high performance concrete (UHPC) is a novel type of cement-based composite material that combines ultra-high strength (≥120MPa), high toughness, and excellent durability, and has shown broad application prospects in bridges, tunnels, super high-rise buildings, and marine engineering. However, because UHPC contains no coarse aggregate and has an extremely low water-cement ratio, its cement content is typically as high as 1000 kg / m³. 3 The cost is approximately 2 to 3 times that of ordinary concrete. This not only significantly increases material costs and energy consumption but also brings enormous carbon emission pressure, thus restricting its large-scale promotion and application to some extent. Therefore, exploring the "cement-free" process in UHPC preparation is of great significance for reducing resource consumption, lowering carbon emissions, and promoting green and low-carbon development.

[0003] Geopolymers are a class of hydraulic cementitious materials produced by the reaction of raw materials rich in amorphous aluminosilicates under the action of alkaline activators. They possess advantages such as rapid setting, high strength, good durability, low energy consumption, low pollution, and the ability to utilize solid waste resources, and are considered potential alternatives to traditional cement. In recent years, how to construct low-carbon, high-performance geopolymer cementitious systems through the synergistic blending of multiple sources of solid waste has become a research hotspot in this field.

[0004] On the other hand, fiber reinforcement has been widely proven to be an effective means of improving the toughness and durability of UHPC. For example, Chinese patent application CN117285280A discloses a method for modifying steel fibers and its application in concrete. The preparation method of this invention includes the following steps: weighing polyallylamine hydrochloride (PAH) and dissolving it in phosphate buffered saline (PBS) solution, stirring thoroughly to obtain a PAH solution of a specific concentration, and preparing a sodium silicate solution of a certain concentration for later use; immersing steel fibers in the PAH solution for a specific time, then removing them and rinsing them with clean water; further immersing the cleaned steel fibers in a sodium silicate solution of a certain concentration for a specific time; removing the immersed steel fibers and rinsing them with clean water; step five: drying the cleaned steel fibers to constant weight, cooling them to room temperature, and then storing them for later use.

[0005] However, due to the significant differences in the reactivity of various solid waste sources, balancing the reactivity characteristics of the geopolymer with the requirements of ultra-high performance (ultra-high strength, high durability, and high toughness) presents challenges such as weak interfacial bonding between the matrix and reinforcing fibers and insufficient early strength. Therefore, there is an urgent need to develop a novel type of ultra-high performance geopolymer concrete based on various solid waste sources, achieving "cement-free" construction while maintaining high strength, high toughness, and excellent durability, thus providing a new technological pathway for the widespread application of green and low-carbon UHPC. Summary of the Invention

[0006] To address the aforementioned technical challenges, this invention provides an ultra-high performance geopolymer concrete and its preparation method. By using geopolymers to achieve "cementless" construction and synergistically utilizing steel fibers and basalt fibers for reinforcement, it ensures high strength, high toughness, and excellent durability. The raw materials are mainly derived from various solid wastes, giving it advantages such as low cost, good environmental performance, and sustainable development. It is suitable for civil engineering structures with high requirements for strength and environmental protection.

[0007] The technical solution of this invention is:

[0008] An ultra-high performance geopolymer concrete comprises the following components and their weight percentages: 750-770 parts slag, 20-130 parts fly ash, 20-130 parts dechlorinated and detoxified waste incineration fly ash, 20-130 parts waste glass powder, 20-130 parts waste limestone powder, 49-51 parts silica fume, 486-497 parts alkali activator, 989-1011 parts quartz sand, 127.5-150.5 parts mixed reinforcing fibers, and 5-10 parts water-reducing agent; wherein the mixed reinforcing fibers include copper-plated rigid steel fibers and flexible basalt fibers.

[0009] Furthermore, the ultra-high performance geopolymer concrete comprises the following components and their weight percentages: 760 parts slag, 50 parts fly ash, 50 parts dechlorinated and detoxified waste incineration fly ash, 50 parts waste glass powder, 40 parts waste limestone powder, 50 parts silica fume, 492 parts alkali activator, 1000 parts quartz sand, 150.5 parts mixed reinforcing fiber, and 10 parts water-reducing agent.

[0010] Furthermore, the hybrid reinforcing fiber is composed of copper-plated rigid steel fiber and flexible basalt fiber in a volume ratio of 60-80:20-40.

[0011] Furthermore, the hybrid reinforcing fiber is composed of copper-plated rigid steel fiber and flexible basalt fiber in a volume ratio of 80:20.

[0012] Furthermore, the copper-plated rigid steel fiber is a copper-plated rigid steel fiber with a length of 12-14 mm and a diameter of 180-230 μm; the flexible basalt fiber has a length of 11-13 mm and a diameter of 16-18 μm.

[0013] Furthermore, the alkaline activator is a 1.4–1.6 M sodium silicate solution.

[0014] Furthermore, the alkaline activator is a 1.5M sodium silicate solution.

[0015] Furthermore, the preparation process of the alkali activator is as follows: using 2.3-3.4M industrial water glass as raw material, sodium hydroxide and water are added to adjust the modulus M.

[0016] The modulus refers to the molar ratio of SiO2 to Na2O in a sodium silicate solution. Adding sodium hydroxide (NaOH) increases the Na2O ratio in the solution, thereby reducing the modulus, while water acts as a diluent. Industrial water glass with a modulus of 2.3 to 3.4 is relatively easy to obtain. In actual preparation, it can also be prepared by mixing sodium silicate solutions with other moduli. The mixing process is a conventional technique known to those skilled in the art.

[0017] Furthermore, the total water content in the alkali activator is 32 wt% of the total amount of the slag, fly ash, dechlorinated and detoxified waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume, which ensures both fluidity and prevents it from being too thin to affect the strength after hardening.

[0018] Furthermore, the particle size requirements for the slag, fly ash, dechlorination and detoxification waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume are as follows: the passing rate through a 100-mesh sieve reaches 100%, and the passing rate through a 200-mesh sieve is not less than 85%.

[0019] Furthermore, the quartz sand is composed of three different particle sizes: 100–150 mesh, 70–100 mesh, and 40–70 mesh, mixed in a mass ratio of 5:2:3. The large-particle-size quartz sand (40–70 mesh) forms the framework structure, the medium-particle-size quartz sand (70–100 mesh) fills the larger gaps between the framework particles, and the small-particle-size quartz sand (100–150 mesh) further fills the tiny gaps between the medium and coarse particles. Finally, the remaining micropores are filled by a cementing material, thus forming a multi-level particle optimization filling system that improves the material's density and mechanical properties.

[0020] Furthermore, the water-reducing agent is a polycarboxylate powder water-reducing agent, which has the advantages of high water reduction rate, small slump loss, and high dispersibility. Even at low content, it can make the slurry have high fluidity.

[0021] In addition, the present invention also provides a method for preparing the ultra-high performance geopolymer concrete, comprising the following steps:

[0022] S1. Weigh out the slag, fly ash, dechlorinated and detoxified waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume by weight, mix them evenly, and prepare the cementitious material for later use.

[0023] S2. Mix the cementitious material obtained in step S1 with quartz sand and water-reducing agent to obtain a mixture;

[0024] S3. Add an alkaline activator to the mixture obtained in step S2, stir evenly, and obtain a slurry;

[0025] S4. Add the mixed reinforcing fibers to the slurry obtained in step S3 and stir until homogeneous to obtain the final product.

[0026] While copper-plated rigid steel fibers can significantly improve the load-bearing capacity and crack control of materials, they suffer from problems such as easy corrosion, heavy weight, and high cost. Flexible basalt fibers, on the other hand, offer advantages such as high strength, corrosion resistance, lightweight, and environmental friendliness, but their toughness and post-cracking load-bearing capacity are relatively insufficient, and their interfacial bonding performance with the matrix is ​​limited. This invention, through extensive creative experiments, has discovered that blending copper-plated rigid steel fibers and flexible basalt fibers in a specific ratio results in a synergistic effect, which not only enhances the toughness of concrete but also improves its corrosion resistance, thereby enhancing the mechanical properties and service durability of geopolymer-based UHPC.

[0027] This invention activates the potential activity of solid wastes such as waste slag, fly ash, dechlorinated and detoxified waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume using an alkali activator to generate geopolymers, which can replace traditional ordinary cement as a cementing material. Furthermore, through the synergistic effect of steel fibers and basalt fibers, the overall performance of concrete is further improved.

[0028] In the research and development of this invention, we faced several technical challenges: First, the chemical composition and reactivity of various solid wastes differ significantly, and direct compounding can easily lead to an imbalance in the system's reaction rate, uncontrollable coagulation time, and fluctuations in mechanical properties; Second, although steel fibers and basalt fibers have complementary characteristics, their optimal synergistic ratio is affected by the coupling effect of multiple factors such as fiber stiffness, flexibility, aspect ratio, and interfacial bonding behavior, and is difficult to determine directly.

[0029] To address the aforementioned issues, this invention, on the one hand, constructs a "high-calcium-low-calcium" synergistic activation mechanism by systematically regulating the composition of the alkali activator and combining it with the chemical composition and reactivity of various solid wastes, thereby achieving precise and controllable matching of the activity of multiple solid wastes and the coagulation process; on the other hand, through a large number of creative experiments and performance response analyses, the optimal synergistic range between steel fibers and basalt fibers has been determined.

[0030] Therefore, compared with the prior art, the ultra-high performance geopolymer concrete prepared by the present invention has the following advantages:

[0031] (1) Achieve “cement-free” preparation, significantly reducing resource consumption and carbon emissions;

[0032] (2) Large-scale use of various solid wastes as raw materials can reduce production costs and realize the resource-based disposal of waste.

[0033] (3) Through the synergistic reinforcement of steel fiber and basalt fiber, high strength, high toughness and excellent durability are achieved.

[0034] (4) The resulting ultra-high performance geopolymer concrete is suitable for civil engineering structures with high requirements for mechanical performance and environmental protection, such as bridges, tunnels, super high-rise buildings and marine engineering, and has broad application prospects. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the raw materials, equipment, etc. used in the following embodiments can be obtained through conventional means.

[0036] Example 1: A type of ultra-high performance geopolymer concrete

[0037] The ultra-high performance geopolymer concrete comprises the following components and their weight percentages: 760 parts slag, 50 parts fly ash, 50 parts dechlorinated and detoxified waste incineration fly ash, 50 parts waste glass powder, 40 parts waste limestone powder, 50 parts silica fume, 492 parts alkali activator, 1000 parts quartz sand, 150.5 parts mixed reinforcing fiber, and 10 parts water-reducing agent.

[0038] The quartz sand is natural quartz sand that has been screened, and is composed of three different particle sizes of quartz sand with particle sizes ranging from 100 to 150 mesh, 70 to 100 mesh, and 40 to 70 mesh, mixed in a mass ratio of 5:2:3.

[0039] The hybrid reinforcing fiber is composed of copper-plated rigid steel fibers and flexible basalt fibers in a volume ratio of 80:20, corresponding to 138.8 parts by weight and 11.7 parts by weight, respectively. The copper-plated rigid steel fibers have a length of 12-14 mm and a diameter of 180-230 μm; the flexible basalt fibers have a length of 11-13 mm and a diameter of 16-18 μm. In this embodiment, the copper-plated rigid steel fibers were purchased from Zhongde Xinya; the flexible basalt fibers were purchased from Huixiang Fiber.

[0040] The water-reducing agent is Subote. Powdered polycarboxylate superplasticizer.

[0041] The method for preparing ultra-high performance geopolymer concrete includes the following steps:

[0042] S1. Add sodium hydroxide and water to industrial water glass with a modulus of 2.39 in proportion, stir evenly and let stand for 24 hours to obtain a 1.5M sodium silicate solution as an alkaline activator for later use.

[0043] S2. Weigh out the slag, fly ash, dechlorinated and detoxified waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume by weight, mix them evenly, and prepare a cementitious material for later use; the particle size requirements of the slag, fly ash, dechlorinated and detoxified waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume are: the passing rate of 100 mesh sieve reaches 100%, and the passing rate of 200 mesh sieve is not less than 85%;

[0044] S3. Mix the cementitious material obtained in step S2 with quartz sand and water-reducing agent to obtain a mixture;

[0045] S4. Add the alkali activator prepared in step S1 to the mixture obtained in step S3, stir evenly to obtain a slurry; during the preparation process, ensure that the total water content in the alkali activator is 32wt% of the cementitious material.

[0046] S5. Add the mixed reinforcing fibers to the slurry obtained in step S4 and stir evenly to obtain the final product.

[0047] S6. Pour the prepared ultra-high performance geopolymer concrete into the mold, cover it with a film and let it stand for 24 hours before demolding, and place it in a standard curing room with a temperature of 20±2℃ and a relative humidity of over 95% for curing.

[0048] Example 2: A type of ultra-high performance geopolymer concrete

[0049] The ultra-high performance geopolymer concrete comprises the following components and their weight parts: 750 parts slag, 50 parts fly ash, 50 parts dechlorinated and detoxified waste incineration fly ash, 50 parts waste glass powder, 40 parts waste limestone powder, 49 parts silica fume, 486 parts alkali activator, 989 parts quartz sand, 150.5 parts mixed reinforcing fiber, and 10 parts water-reducing agent.

[0050] The quartz sand is natural quartz sand that has been screened, and is composed of three different particle sizes of quartz sand with particle sizes ranging from 100 to 150 mesh, 70 to 100 mesh, and 40 to 70 mesh, mixed in a mass ratio of 5:2:3.

[0051] The hybrid reinforcing fiber is composed of copper-plated rigid steel fibers and flexible basalt fibers in a volume ratio of 80:20, corresponding to 138.8 parts by weight and 11.7 parts by weight, respectively. The copper-plated rigid steel fibers have a length of 12-14 mm and a diameter of 180-230 μm; the flexible basalt fibers have a length of 11-13 mm and a diameter of 16-18 μm. In this embodiment, the copper-plated rigid steel fibers were purchased from Zhongde Xinya; the flexible basalt fibers were purchased from Huixiang Fiber.

[0052] The water-reducing agent is Subote. Powdered polycarboxylate superplasticizer.

[0053] The preparation method of the ultra-high performance geopolymer concrete is similar to that in Example 1.

[0054] Example 3: A type of ultra-high performance geopolymer concrete

[0055] The ultra-high performance geopolymer concrete comprises the following components and their weight percentages: 770 parts slag, 50 parts fly ash, 50 parts dechlorinated and detoxified waste incineration fly ash, 50 parts waste glass powder, 40 parts waste limestone powder, 51 parts silica fume, 497 parts alkali activator, 1011 parts quartz sand, 150.5 parts mixed reinforcing fiber, and 10 parts water-reducing agent.

[0056] The quartz sand is natural quartz sand that has been screened, and is composed of three different particle sizes of quartz sand with particle sizes ranging from 100 to 150 mesh, 70 to 100 mesh, and 40 to 70 mesh, mixed in a mass ratio of 5:2:3.

[0057] The hybrid reinforcing fiber is composed of copper-plated rigid steel fibers and flexible basalt fibers in a volume ratio of 80:20, corresponding to 138.8 parts by weight and 11.7 parts by weight, respectively. The copper-plated rigid steel fibers have a length of 12-14 mm and a diameter of 180-230 μm; the flexible basalt fibers have a length of 11-13 mm and a diameter of 16-18 μm. In this embodiment, the copper-plated rigid steel fibers were purchased from Zhongde Xinya; the flexible basalt fibers were purchased from Huixiang Fiber.

[0058] The water-reducing agent is Subote. Powdered polycarboxylate superplasticizer.

[0059] The preparation method of the ultra-high performance geopolymer concrete is similar to that in Example 1.

[0060] Example 4: A type of ultra-high performance geopolymer concrete

[0061] The ultra-high performance geopolymer concrete comprises the following components and their weight percentages: 760 parts slag, 130 parts fly ash, 20 parts dechlorinated and detoxified waste incineration fly ash, 20 parts waste glass powder, 20 parts waste limestone powder, 50 parts silica fume, 492 parts alkali activator, 1000 parts quartz sand, 150.5 parts mixed reinforcing fiber, and 10 parts water-reducing agent.

[0062] The quartz sand is natural quartz sand that has been screened, and is composed of three different particle sizes of quartz sand with particle sizes ranging from 100 to 150 mesh, 70 to 100 mesh, and 40 to 70 mesh, mixed in a mass ratio of 5:2:3.

[0063] The hybrid reinforcing fiber is composed of copper-plated rigid steel fibers and flexible basalt fibers in a volume ratio of 80:20, corresponding to 138.8 parts by weight and 11.7 parts by weight, respectively. The copper-plated rigid steel fibers have a length of 12-14 mm and a diameter of 180-230 μm; the flexible basalt fibers have a length of 11-13 mm and a diameter of 16-18 μm. In this embodiment, the copper-plated rigid steel fibers were purchased from Zhongde Xinya; the flexible basalt fibers were purchased from Huixiang Fiber.

[0064] The water-reducing agent is Subote. Powdered polycarboxylate superplasticizer.

[0065] The preparation method of the ultra-high performance geopolymer concrete is similar to that in Example 1.

[0066] Example 5: A type of ultra-high performance geopolymer concrete

[0067] The ultra-high performance geopolymer concrete comprises the following components and their weight percentages: 760 parts slag, 50 parts fly ash, 50 parts dechlorinated and detoxified waste incineration fly ash, 50 parts waste glass powder, 40 parts waste limestone powder, 50 parts silica fume, 492 parts alkali activator, 1000 parts quartz sand, 127.5 parts mixed reinforcing fiber, and 10 parts water-reducing agent.

[0068] The quartz sand is natural quartz sand that has been screened, and is composed of three different particle sizes of quartz sand with particle sizes ranging from 100 to 150 mesh, 70 to 100 mesh, and 40 to 70 mesh, mixed in a mass ratio of 5:2:3.

[0069] The hybrid reinforcing fiber is composed of copper-plated rigid steel fibers and flexible basalt fibers in a volume ratio of 60:40, corresponding to 104.1 parts by weight and 23.4 parts by weight, respectively. The copper-plated rigid steel fibers have a length of 12-14 mm and a diameter of 180-230 μm; the flexible basalt fibers have a length of 11-13 mm and a diameter of 16-18 μm. In this embodiment, the copper-plated rigid steel fibers were purchased from Zhongde Xinya; the flexible basalt fibers were purchased from Huixiang Fiber.

[0070] The water-reducing agent is Subote. Powdered polycarboxylate superplasticizer.

[0071] The preparation method of the ultra-high performance geopolymer concrete is similar to that in Example 1.

[0072] Example 6: A type of ultra-high performance geopolymer concrete

[0073] The ultra-high performance geopolymer concrete comprises the following components and their weight percentages: 760 parts slag, 50 parts fly ash, 50 parts dechlorinated and detoxified waste incineration fly ash, 50 parts waste glass powder, 40 parts waste limestone powder, 50 parts silica fume, 492 parts alkali activator, 1000 parts quartz sand, 150.5 parts mixed reinforcing fiber, and 5 parts water-reducing agent.

[0074] The quartz sand is natural quartz sand that has been screened, and is composed of three different particle sizes of quartz sand with particle sizes ranging from 100 to 150 mesh, 70 to 100 mesh, and 40 to 70 mesh, mixed in a mass ratio of 5:2:3.

[0075] The hybrid reinforcing fiber is composed of copper-plated rigid steel fibers and flexible basalt fibers in a volume ratio of 80:20, corresponding to 138.8 parts by weight and 11.7 parts by weight, respectively. The copper-plated rigid steel fibers have a length of 12-14 mm and a diameter of 180-230 μm; the flexible basalt fibers have a length of 11-13 mm and a diameter of 16-18 μm. In this embodiment, the copper-plated rigid steel fibers were purchased from Zhongde Xinya; the flexible basalt fibers were purchased from Huixiang Fiber.

[0076] The water-reducing agent is Subote. Powdered polycarboxylate superplasticizer.

[0077] The preparation method of the ultra-high performance geopolymer concrete is similar to that in Example 1.

[0078] Comparative Example 1: A Geopolymer Concrete

[0079] It is basically the same as Example 1, except that the slag is 500 parts and the fly ash is 310 parts.

[0080] Comparative Example 2: A Geopolymer Concrete

[0081] It is basically the same as Example 1, except that the total water content in the alkali activator is increased to 45 wt% of the cementitious material, and the corresponding amount of alkali activator is increased to 622 parts.

[0082] Comparative Example 3: A Geopolymer Concrete

[0083] It is basically the same as Example 1, except that the mixed reinforcing fiber is 104.5 parts. The mixed reinforcing fiber is composed of copper-plated rigid steel fiber and flexible basalt fiber in a volume ratio of 40:60, with corresponding weight parts of 69.4 parts and 35.1 parts, respectively.

[0084] Comparative Example 4: A Geopolymer Concrete

[0085] It is basically the same as Example 1, the only difference being that Subote is used. The powdered polycarboxylate superplasticizer was replaced with an equal mass of lignin-based superplasticizer (Hemu brand sodium lignin sulfonate).

[0086] Experiment 1: Performance Testing

[0087] 1. Test samples: Ultra-high performance geopolymer concrete prepared in Examples 1-6, and geopolymer concrete prepared in Comparative Examples 1-4;

[0088] 2. Test methods: The fluidity of the above samples was determined according to the national standard "Test Method for Flowability of Cement Mortar" (GB / T 2419-2005), and the 28-day compressive strength and flexural strength of the above samples were determined according to the national standard "Test Method for Strength of Cement Mortar" (GB / T 17671-2020).

[0089] 3. Experimental results: The specific experimental results are shown in Table 1.

[0090] Table 1. Results of flowability, compressive strength, and flexural strength measurements for different test samples.

[0091]

[0092] As shown in Table 1 above, the ultra-high performance geopolymer concrete prepared in Examples 1-6 of this invention has a flowability ≥210mm, a 28-day compressive strength ≥137.7MPa, and a 28-day flexural strength ≥16.5MPa, exhibiting excellent comprehensive performance with small dispersion. Comparing Examples 1-3, when the cementitious materials, alkali activator, and quartz sand are adjusted in a coordinated manner within approximately ±1%, the workability and mechanical properties are essentially equivalent. Compared to Example 1, Example 4, while maintaining the same slag content, increases the fly ash ratio and correspondingly reduces the proportions of dechlorinated and detoxified waste incineration fly ash, waste glass powder, and waste limestone powder, resulting in a slight increase in flowability, but a slight decrease in compressive and flexural strength. Examples 5-6 show that appropriately increasing the proportion of flexible basalt fiber or reducing the amount of water-reducing agent can cause slight performance fluctuations, but the overall performance remains at a high level.

[0093] Compared with Example 1, Comparative Examples 1-2 show that reducing the amount of slag and correspondingly increasing the amount of fly ash or increasing the total water content in the alkali activator will significantly weaken the mechanical properties; Comparative Examples 3-4 show that excessively increasing the proportion of flexible basalt fiber or using lignin-based water-reducing agents that are prone to decomposition in a strongly alkaline environment will also affect workability and strength.

[0094] In summary, this invention utilizes an alkali activator to stimulate the latent activity of various solid wastes, causing them to generate geopolymers. While ensuring excellent workability and compressive strength, it completely avoids the use of cement, significantly improving the utilization rate of solid waste, reducing production costs, and minimizing environmental pollution. Simultaneously, the synergistic effect of copper-plated rigid steel fibers and flexible basalt fibers further enhances the overall performance of the concrete. This product is suitable for civil engineering structures with high requirements for strength and environmental friendliness.

[0095] Finally, it should be noted that the above embodiments are merely illustrative of the principles, performance, and effects of the present invention, and are not intended to limit the present invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A high-performance geopolymer concrete, characterized in that, It includes the following components and their weight proportions: 750-770 parts slag, 20-130 parts fly ash, 20-130 parts dechlorinated and detoxified waste incineration fly ash, 20-130 parts waste glass powder, 20-130 parts waste limestone powder, 49-51 parts silica fume, 486-497 parts alkali activator, 989-1011 parts quartz sand, 127.5-150.5 parts mixed reinforcing fiber, and 5-10 parts water-reducing agent.

2. The ultra-high performance geopolymer concrete according to claim 1, characterized in that, It includes the following components and their weight parts: 760 parts slag, 50 parts fly ash, 50 parts dechlorinated and detoxified waste incineration fly ash, 50 parts waste glass powder, 40 parts waste limestone powder, 50 parts silica fume, 492 parts alkali activator, 1000 parts quartz sand, 150.5 parts mixed reinforcing fiber, and 10 parts water-reducing agent.

3. The ultra-high performance geopolymer concrete according to claim 1 or 2, characterized in that, The hybrid reinforcing fiber is composed of copper-plated rigid steel fiber and flexible basalt fiber in a volume ratio of 60-80:20-40.

4. The ultra-high performance geopolymer concrete according to claim 1 or 2, characterized in that, The hybrid reinforcing fiber is composed of copper-plated rigid steel fiber and flexible basalt fiber in a volume ratio of 80:

20.

5. The ultra-high performance geopolymer concrete according to claim 1 or 2, characterized in that, The copper-plated rigid steel fiber is a copper-plated rigid steel fiber with a length of 12-14 mm and a diameter of 180-230 μm; The flexible basalt fiber has a length of 11–13 mm and a diameter of 16–18 μm.

6. The ultra-high performance geopolymer concrete according to claim 1 or 2, characterized in that, The alkaline activator is a 1.4–1.6 M sodium silicate solution.

7. The ultra-high performance geopolymer concrete according to claim 1 or 2, characterized in that, The particle size requirements for the slag, fly ash, dechlorinated and detoxified waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume are as follows: 100% passing through a 100-mesh sieve, and no less than 85% passing through a 200-mesh sieve.

8. The ultra-high performance geopolymer concrete according to claim 1 or 2, characterized in that, The quartz sand is composed of three different particle sizes, with particle sizes ranging from 100 to 150 mesh, 70 to 100 mesh, and 40 to 70 mesh, respectively, and is mixed in a mass ratio of 5:2:

3.

9. The ultra-high performance geopolymer concrete as described in claim 1 or 2, characterized in that, The water-reducing agent is a polycarboxylate powder water-reducing agent.

10. A method for preparing ultra-high performance geopolymer concrete as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Weigh out the slag, fly ash, dechlorinated and detoxified waste incineration fly ash, waste glass powder, waste limestone powder, and silica fume by weight, mix them evenly, and prepare the cementitious material for later use. S2. Mix the cementitious material obtained in step S1 with quartz sand and water-reducing agent to obtain a mixture; S3. Add an alkaline activator to the mixture obtained in step S2, stir evenly, and obtain a slurry; S4. Add the mixed reinforcing fibers to the slurry obtained in step S3 and stir until homogeneous to obtain the final product.

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