A hydraulic fluid solid waste binder and preparation method thereof

Abstract

The present application relates to the technical field of road filling materials, and mainly to a hydraulic fluid solid waste binder and a preparation method thereof. The hydraulic fluid solid waste binder includes: a binder composition; the binder composition is calculated by weight and includes the following raw materials: solid waste base material: 75-95 parts of solid waste base material, 4-20 parts of hydraulic cementitious material, 0.3-3 parts of admixture, and 0.3-2 parts of fiber; water; the weight ratio of water to the binder composition is 0.4-0.85:1; the length of the fiber is 5 cm and the diameter is 1 mm; the admixture is a combination of triethanolamine and sodium sulfate. The provided hydraulic fluid solid waste binder has good self-compacting and self-hardening properties, can realize the resource recycling of a large amount of solid waste materials, has good comprehensive performance after the bonding, can be used to replace traditional bulk materials for road construction or filling, and can realize the comprehensive utilization of solid waste resources for roads.

Description

Technical Field

[0001] The present application relates to the technical field of road filling materials, and mainly to a hydraulic fluid solid waste binder and a preparation method thereof. Background Art

[0002] With the continued progress of my country's infrastructure construction, my country's highway mileage has ranked first in the world and continues to grow. This creates a significant demand for road filling materials. Currently, road construction and pipeline corridors are typically filled with bulk materials such as earth, stone, and sand and gravel. Because bulk materials primarily provide strength through friction and intergranular interlocking forces, they are difficult to self-stabilize. When used as roadbed fill materials, they often require sloping to form a roadbed. After filling, they require rolling and compaction to meet their requirements. Furthermore, natural earth or ash soil is sensitive to moisture content, making construction susceptible to environmental and weather constraints. Even after filling, low strength and high loss rates persist. Furthermore, with increasing environmental protection requirements in the transportation and civil engineering sectors, high-quality fill resources such as earth and sand and gravel are becoming increasingly scarce, making it difficult to meet the large-scale requirements for road construction or tailings filling.

[0003] Fluid binders typically use soil as their primary base material, adding appropriate amounts of hydraulic binders, certain additives, and water, with foam added as needed. After stirring and homogenizing, the binder can be piped or pumped and self-compacted into a strong, self-sustaining engineering material after setting and hardening. Applying fluid binders as road filling materials not only reduces the consumption of fill resources but also achieves better road construction or filling performance after hardening, potentially replacing sand and gravel as a filling material.

[0004] With the acceleration of my country's industrialization, the production and stock of solid wastes such as red mud, white mud (alkali residue), fly ash, tailings sand, and phosphogypsum are currently significant. The stock of solid wastes such as construction waste and engineering waste soil is also increasing year by year. The storage of these solid wastes not only takes up land, but also causes serious secondary pollution and is difficult to recycle as resources. Currently, there is no comprehensive solution to the large-scale disposal of solid waste and the scarcity of fill resources for engineering applications. In existing technologies for applying industrial solid waste to concrete, the amount of industrial solid waste used is generally low, which cannot be achieved through large-scale resource utilization. Once the amount of industrial solid waste is increased, it is difficult to ensure the overall performance of the concrete. The resulting slurry often has poor workability, which is not conducive to large-scale cast-in-place. Moreover, the setting and hardening effect is limited, and the heavy metal ions present in some solid waste cannot be fixed. If not addressed, it can easily lead to pollution of roadside land or farmland. Therefore, the existing technology needs to be improved and developed. Summary of the Invention

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of this application is to provide a hydraulic fluidized solid waste binder and a preparation method thereof, aiming to solve the problems of poor workability and general bonding effect when a large proportion of solid waste is used in existing concrete.

[0006] The technical solution of this application is as follows:

[0007] In a first aspect, the present application provides a hydraulic fluidized solid waste binder, comprising the following raw materials:

[0008] (1) Binder composition; the binder composition, calculated in parts by weight, includes:

[0009] 75-95 parts of solid waste base material, 4-20 parts of hydraulic cementitious material, 0.3-3 parts of admixture, and 0.3-2 parts of fiber;

[0010] (2) water; the weight ratio of water to the binder composition is 0.4-0.85:1;

[0011] The fiber has a length of 5 cm and a diameter of 1 mm;

[0012] The admixture is a combination of triethanolamine and glauber salt.

[0013] The hydraulic fluid solid waste binder provided in the present application can realize large-scale resource recycling of solid waste base materials. After being made into slurry, it has good self-leveling, self-compacting and self-hardening properties. After hardening, it has self-stability in shape and can be used for vertical filling. After hardening, it has good engineering durability as a road construction and filling material. It can be used to replace traditional bulk materials for road construction filling materials, or to replace traditional mortar cement slurry for filling small spaces and effectively address the problem of scarcity of existing filling resources, thereby realizing the comprehensive utilization of solid waste resources in the road sector.

[0014] Further, the fiber is one of polypropylene fiber and glass fiber;

[0015] The glass fiber is alkali-resistant glass fiber.

[0016] Furthermore, the weight ratio of the triethanolamine to the sulphur dioxide is 1:2.

[0017] Furthermore, the hydraulic cementitious material is one or both of cement and mineral powder.

[0018] Furthermore, the mineral powder is one or both of blast furnace slag powder and ultrafine composite mineral admixture.

[0019] Furthermore, the hydraulic binder is a combination of the cement and blast furnace slag powder, and the weight ratio of the cement to the blast furnace slag powder is 1:0.5-5.

[0020] Furthermore, the cement is one or both of Portland cement and sulfate cement.

[0021] Furthermore, the solid waste base material is one or more of fly ash, desulfurization ash, desulfurization gypsum, red mud, alkali slag, ceramic polishing slag, carbide slag, tailings slag, phosphogypsum and stone saw mud.

[0022] Furthermore, the specific surface area of ​​the solid waste base material is not less than 200m 2 / Kg.

[0023] In a second aspect, the present application provides a method for preparing the hydraulic fluidized solid waste binder as described in the first aspect, comprising the following steps:

[0024] Weighing the solid waste base material, hydraulic binder, admixture and fiber, and mixing the fiber and admixture to obtain a first mixture;

[0025] Mixing the solid waste base material with a portion of water to obtain a second mixture, and then mixing the remaining water, the hydraulic binder, the first mixture, and the second mixture according to a water-to-solid ratio to obtain a wet hydraulic fluidized solid waste binder;

[0026] The weight ratio of the partial water to the remaining water is 8:2.

[0027] Beneficial effects: This application can effectively consolidate the large component of solid waste base materials in the hydraulic fluid solid waste binder by using hydraulic cementitious materials and fibers. After coagulation, it can also stabilize the heavy metal ions present in some solid wastes, thereby reducing the risk of pollution. The hydraulic fluid solid waste binder provided has the characteristics of bulk density, strength regulation, and self-compacting and self-hardening. It does not require rolling and compaction operations and can be easily applied to vertical roadbeds. It can also be widely used in highway engineering and municipal engineering to solve the problem of poor filling effect of conventional bulk materials. At the same time, it can realize the comprehensive utilization of solid waste resources on roads, which is of great significance to my country's environmental protection cause. DETAILED DESCRIPTION

[0028] This application provides a hydraulically hardened fluidized solid waste binder and a method for preparing the same. To clarify the purpose, technical solution, and effects of this application, the application is further described below. It should be understood that the specific embodiments described herein are merely intended to explain this application and are not intended to limit this application.

[0029] The present application provides a hydraulic fluidized solid waste binder, which includes the following raw materials:

[0030] (1) Binder composition; the binder composition, calculated in parts by weight, includes:

[0031] 75-95 parts of solid waste base material, 4-20 parts of hydraulic cementitious material, 0.3-3 parts of admixture, and 0.3-2 parts of fiber;

[0032] (2) Water; the weight ratio of water to the binder composition is 0.4-0.85:1.

[0033] The hydraulic fluid solid waste binder provided by the present application needs to be mixed and stirred with a certain amount of water to form a fluid mixed slurry when used, and finally hardens into a material that meets the use strength requirements through hydration reaction, wherein the weight ratio of water to the binder composition is generally 0.4-0.85:1. The hydraulic fluid solid waste binder of the present application is filled in a large amount when used, and is generally carried out through large-scale cast-in-place, which can control the fluidity to be not less than 140mm, and the casting performance is relatively good. This ratio is also beneficial for the hydraulic fluid solid waste binder of the present application to maintain sufficient fluidity after being prepared into a slurry, which can achieve large-scale cast-in-place, and can meet the self-leveling requirements after pouring, which is convenient for construction, and the strength retention effect after hardening is good.

[0034] This application realizes the resource reuse of a large amount of solid waste base materials under the premise of ensuring that the filling and roadbed standards are met. The prepared hydraulic fluid solid waste binder is a controllable low-strength material relative to structural concrete. It has good self-leveling, self-compacting and self-hardening properties. After hardening, it has shape self-stability and can be used for vertical filling. After hardening, it has good engineering durability as a road construction and filling material. Moreover, as a controllable low-strength material, it also has strong excavability, which is convenient for engineering maintenance and repair. After construction, it does not need to be rolled and compacted like bulk materials to be evenly dispersed and hardened and self-stabilized. It has good compressive and fatigue resistance. It can be used to replace traditional bulk materials for road construction filling materials, or to replace traditional mortar cement slurry for filling small spaces and effectively address the problem of scarce existing filling resources.

[0035] Furthermore, the fiber is one of glass fiber and polypropylene fiber. Glass fiber is more preferred, as it can participate in the hydration reaction in the hydraulic fluid solid waste binder so that its mechanical properties can be further exerted. The glass fiber is more preferably alkali-resistant glass fiber, and its mechanical properties and erosion resistance are better than those of ordinary glass fiber. In the present application, the anti-seepage performance of the hydraulic fluid solid waste binder can be improved by adding glass fiber or polypropylene fiber, which is conducive to slowing down the weathering effect when used as a roadbed and improving weather resistance. Moreover, the fiber can also improve the tensile strength and toughness of the hydraulic fluid solid waste binder at this dosage, which can control cracking and reduce the risk of shrinkage cracks.

[0036] Furthermore, the length of the fiber is 5 cm and the diameter is 1 mm. In the hydraulic fluid solid waste binder of the present application, the solid waste base material with a smaller particle size is the main component, and the size of the fiber needs to be coordinated. The present application uses fibers of this length and diameter in the binder to achieve a more obvious reinforcing effect, which can improve the overall mechanical properties of the hydraulic fluid solid waste binder. In addition, the amount of hydraulic cementitious material used in the present application matches the solid waste base material. If fibers with smaller length and diameter are used, and the activity is higher, especially when glass fibers are used, additional hydration reactions with the hydraulic cementitious material are likely to occur, which will not only consume the amount of hydraulic cementitious material and affect the overall bonding effect of the solid waste base material, but will also further weaken the fiber effect after the reaction, resulting in limited improvement in the mechanical properties in the binder. By using fibers of appropriate length and diameter, the present application maintains the fiber morphology while participating in a certain hydration reaction for bonding, thereby improving the toughness and at the same time achieving a better mechanical transmission effect, which is beneficial to improving the overall mechanical properties of the hydraulic fluidized solid waste binder. By improving the toughness, it is also beneficial for the hydraulic fluidized solid waste binder to have good elastic recovery, and can improve the compressive and fatigue resistance.

[0037] Furthermore, the admixture is a combination of triethanolamine and sodium sulfate. In the present application, the dosage of the solid waste base material is relatively large, which has a more obvious effect on the performance of the hydraulic fluid solid waste binder, especially the water demand and early strength, which will affect the water-solid ratio and compressive strength of the binder. By adding admixtures, the performance of the hydraulic fluid solid waste binder can be significantly improved, wherein by using triethanolamine, the fluidity can be improved, the water-solid ratio can be reduced, and the workability of the binder can be improved. By using sodium sulfate, an early strength effect can be achieved, the coagulation of the binder can be accelerated, and the strength and durability of the binder after coagulation are improved, thereby improving the working performance. Among them, the weight proportion of the admixture in the binder composition is 0.3-3 parts. In actual use, the dosage of the admixture can be determined according to the performance requirements of the specific working conditions.

[0038] Furthermore, the weight ratio of triethanolamine to sodium sulfate is 1:2. In the present application, the length and particle size of the fibers used are relatively large, which is quite different from the solid waste base material with a smaller particle size as a whole in the present application. The distribution of the fibers in the hydraulic fluid solid waste binder can be improved by triethanolamine, but too much triethanolamine can easily lead to the risk of the fibers agglomerating together in the binder. Moreover, the surface area of ​​the fibers is relatively large, and they will also participate in the hydration reaction when glass fibers are used. Therefore, the present application controls the weight ratio of triethanolamine to sodium sulfate to 1:2. While ensuring sufficient fluidity, the amount of sodium sulfate used is also sufficient to achieve an early strengthening effect on the fibers and the remaining components. By first performing a hydration reaction on the fibers to generate crystals, the density near the fibers is increased, and the reinforcing effect of the fibers in the hydraulic fluid solid waste binder is further improved.

[0039] Furthermore, the hydraulic binder is one or both of cement and mineral powder. Unlike bulk materials, which are difficult to stabilize themselves, the present invention uses hydraulic binders to bond and consolidate solid waste base materials to form a hydraulic fluid solid waste binder. By constraining the components through van der Waals forces, the hydraulic fluid solid waste binder can maintain the filling effect and provide strength for a long time after hardening, resulting in higher overall strength.

[0040] Furthermore, the mineral powder is one or both of blast furnace slag powder and ultrafine composite mineral admixtures. In the present application, blast furnace slag powder can be secondary hydrated by the hydration products of cement, providing a certain strength-enhancing effect in the cementation stage. After the activity of blast furnace slag powder is well stimulated, it is beneficial to improve the overall strength of the hydraulic fluidized solid waste binder. In addition, blast furnace slag powder can be replaced by ultrafine composite mineral admixtures with a higher specific surface area and a particle size of less than 30 μm, which mainly include steel slag, slag, fly ash, tailings and stone powder. The ultrafine composite mineral admixture has better performance and relatively higher cost, but the dosage can be reduced by 20%-30%.

[0041] Furthermore, the hydraulic cementitious material is a combination of cement and blast furnace slag powder, and the weight ratio of cement to blast furnace slag powder is 1:0.5-5. In the present application, by using cement and blast furnace slag powder to provide a base material for hydration reaction, the selected blast furnace slag powder can not only reduce the amount of cement but also play an active role in hydration reaction. However, since the strength grade of the hydraulic fluidized solid waste binder of the present application is required to be lower than that of structural concrete, and no additional stimulant is added, if the amount of blast furnace slag powder is further increased, the activity of the remaining blast furnace slag powder cannot be fully exerted, but will affect the early strength of the hydraulic fluidized solid waste binder and the overall strength after solidification. Therefore, it is necessary to control the amount of blast furnace slag powder used within a certain range, which is beneficial to maintain the strength of the hydraulic fluidized solid waste binder while reducing material costs.

[0042] In this application, the weight percentage of the hydraulic binder in the binder composition is 4-20 parts. The solid waste base material used in this application is generally composed primarily of silicon, aluminum, or calcium. The hydration reaction of the hydraulic binder forms a spatial network structure, which wraps, connects, and compacts the soil particles in the solid waste base material. Furthermore, the selected solid waste base material generally contains certain active ingredients that participate in the hydration reaction and enhance synergy. Therefore, a weight percentage of 4-20 parts of the hydraulic binder in the binder composition can meet the strength requirements of road construction and reduce costs.

[0043] Furthermore, the cement is one or both of Portland cement and sulfate cement. In the present application, when glass fiber is used as the fiber, sulfate cement can be used, which has a lower erosion effect on the glass fiber and a longer service life of the hydraulic fluid solid waste binder.

[0044] Furthermore, the solid waste base material is one or more of fly ash, desulfurization ash, desulfurization gypsum, red mud, alkali residue, ceramic polishing residue, aluminum ash, carbide slag, tailings slag, phosphogypsum, and stone sawdust (limestone powder). The solid waste base material used in this application is industrial solid waste, which can generally be reused depending on local solid waste resources. Different solid waste base materials have different properties, and the amount of hydraulic binder used and the water-to-solid ratio during actual preparation can be adjusted to some extent.

[0045] Furthermore, the specific surface area of ​​the solid waste base material is not less than 200m 2 / Kg. As the main component, the solid waste base material has a great influence on the fluidity of the hydraulic fluid solid waste binder. The solid waste base material with a lower particle size can improve the workability of the hydraulic fluid solid waste binder, which is beneficial for pouring. Under the appropriate water-solid ratio, the binder can achieve good self-leveling after pouring. Moreover, the solid waste base material with a higher specific surface area has higher activity, and after hardening, it can improve the overall binding effect of the hydraulic fluid solid waste binder. In addition, the hydraulic fluid solid waste binder provided in the present application is a controllable low-strength material, and its strength can also be controlled by adding foam during use, while the solid waste base material with a larger particle size generally has a microporous structure, which can easily defoam the foam. Therefore, controlling the particle size of the solid waste base material is also beneficial to stabilize the foam during foaming and reduce the risk of defoaming.

[0046] Among the selected solid waste base materials, the active ingredients in the alkali slag are more than those in other solid waste base materials, and some of the calcium components can also participate in the hydration reaction. When used as a solid waste base material, the amount of hydraulic cementitious materials can be reduced. When the solid waste base material uses alkali slag, the hydraulic fluidized solid waste binder of the present application includes: (1) a binder composition; the binder composition, calculated by weight, includes the following raw materials: 85-95 parts of alkali slag, 4-15 parts of hydraulic cementitious materials, 0.3-3 parts of admixtures, and 0.3-2 parts of fibers; (2) water; the weight ratio of water to the binder composition is 0.4-0.6:1. During the coagulation process of the hydration reaction, a large amount of alkali slag can also provide an alkaline environment. The calcium component of the alkali slag can also form a hydration product after the hydration reaction, and the density is also high. The strength of the hydraulic fluidized solid waste binder prepared by the alkali slag is also relatively higher.

[0047] For example, the main component of red mud is silicon. It can be used in combination with desulfurized gypsum in the solid waste base material to supplement part of the calcium component to ensure the hydration reaction. When red mud and desulfurized gypsum are used as the solid waste base material, the hydraulic fluidized solid waste binder of the present application includes: (1) a binder composition; the binder composition includes the following raw materials in parts by weight: 74-94 parts of red mud, 1-6 parts of desulfurized gypsum, 4-20 parts of hydraulic cementitious materials, 0.3-3 parts of admixtures, and 0.3-2 parts of fibers; (2) water; the weight ratio of water to the binder composition is 0.7-0.85:1. The reuse of red mud is difficult. By mixing desulfurized gypsum and red mud, the binding properties of red mud are improved. The hydraulic fluidized solid waste binder obtained also has a sufficiently high compressive strength after solidification, which can effectively solve the problem of red mud treatment.

[0048] For example, although phosphogypsum is mainly composed of calcium sulfate, its activity excitation ability is average. However, by mixing it with a certain amount of carbide slag, it can improve the strength of the hydraulic fluid solid waste binder. When phosphogypsum and carbide slag are used as solid waste base materials, the hydraulic fluid solid waste binder of the present application includes: (1) a binder composition; the binder composition includes the following raw materials, calculated by weight: 74.2-94.2 parts of phosphogypsum, 0.8-2 parts of carbide slag, 4-20 parts of hydraulic cementitious material, 0.3-3 parts of admixture, and 0.3-2 parts of fiber; (2) water; the weight ratio of water to binder composition is 0.4-0.5:1. The addition of carbide slag to the hydraulically settable fluidized solid waste binder can stimulate its activity, particularly when the amount of blast furnace slag powder in the hydraulic binder is high. This can enhance the late-stage strength-enhancing effect of the blast furnace slag powder, resulting in higher strength after complete solidification. The use of phosphogypsum as a base material, due to the large amount of phosphogypsum used, may lead to a certain volume expansion after solidification and long-term use. By replacing a portion of the shrinkage-prone dry soil with phosphogypsum, deformation can be suppressed while maintaining sufficient strength. The amount of dry soil used is 15-30 parts.

[0049] For example, the desulfurization ash has good cementing properties and has high strength after solidification through hydraulic cementing materials. At the same time, the desulfurization ash has good sphericity and moderate fluidity when the water-solid ratio meets the requirements. It has good pouring performance, and the self-leveling performance and cementing effect after pouring are also better. Whether it is used alone or mixed with other solid wastes, it can also improve the cementing properties. When fly ash and desulfurization ash are used as solid waste base materials, the hydraulic fluidized solid waste binder of this application includes: (1) a binder composition; the binder composition is calculated by weight and includes the following raw materials: 50-70 parts of fly ash, 25-30 parts of desulfurization ash, 4-20 parts of hydraulic cementing materials, 0.3-3 parts of admixtures, and 0.3-2 parts of fibers; (2) water; the weight ratio of water to the binder composition is 0.4-0.5:1. Fly ash is prone to shrinkage and cracking when used in high dosages. By compounding it with expansive desulfurization ash, the cracking phenomenon of fly ash can be addressed and the performance of the hydraulic fluid solid waste binder can be improved.

[0050] For example, ceramic polishing slag has higher mechanical strength but also contains more inert components. The amount of hydraulic cementitious material can be appropriately increased. When ceramic polishing slag is used as the solid waste base material, the hydraulic fluid solid waste binder of the present application includes: (1) a binder composition; the binder composition is calculated by weight and includes the following raw materials: 75-85 parts of ceramic polishing slag, 10-20 parts of hydraulic cementitious material, 0.3-3 parts of admixture, and 0.3-2 parts of fiber; (2) water; the weight ratio of water to the binder composition is 0.4-0.6:1. By increasing the amount of hydraulic cementitious material, the bonding effect and strength can be guaranteed. The obtained binder has good weather resistance. The inert components therein can resist the dry-wet cycle or freeze-thaw cycle during filling and use, and can also reduce the erosion effect of weathering, thereby improving the performance and service life of the hydraulic fluid solid waste binder.

[0051] The hydraulically hardened fluidized solid waste binder provided in this application can reuse large amounts of industrial solid waste while meeting road filling requirements, effectively solving the problem of industrial solid waste disposal. Furthermore, the water-to-solid ratio and the consolidation effect of the hydration reaction provided in this application can effectively dilute the heavy metal content in the solid waste base material. According to the standards for Class II construction land, after hardening, it can also meet the heavy metal content requirements of the "Standard for Soil Pollution Risk Management and Control of Construction Land" GB36600-2018.

[0052] The hydraulically hardened fluidized solid waste binder provided in this application serves as a novel roadbed filler, addressing the large-scale disposal of solid waste materials. By incorporating water into the hydration reaction, the binder achieves a self-stable shape and vertical filling after hardening and bonding, with construction conditions minimally affected by weather. Compared to traditional earthwork materials, it is inexpensive, economical, and easy to construct, allowing for large-scale cast-in-place applications. After bonding, it exhibits excellent performance, meeting the requirements for fill materials and potentially replacing traditional earthwork as the primary roadbed filler.

[0053] The present application also provides a method for preparing the hydraulic fluidized solid waste binder as described above, which comprises the following steps:

[0054] Weighing a solid waste base material, a hydraulic cementitious material and fibers, and stirring and mixing them uniformly to obtain a cementitious material composition;

[0055] The binder composition and water are mixed evenly according to the water-solid ratio to obtain a wet hydraulic fluid solid waste binder.

[0056] After the wet hydraulic fluid solid waste binder is prepared, the hydraulic fluid solid waste binder can be obtained by solidifying it.

[0057] Among them, the solid waste base material and water can be mixed to make slurry through a mixing station. Since the solid waste base material is stored in a cement silo or in an open-air storage yard, the water content of the solid waste base material is different. The water content of the solid waste base material can be detected and the water-solid ratio can be appropriately adjusted to control the fluidity of the hydraulic fluid solid waste binder slurry to meet 140mm and above, ensuring sufficient fluidity for large-scale casting. When the water content of the solid waste base material is low, the solid waste base material, hydraulic binder and fiber can be mixed through a cement screw conveyor and then mixed with water to make slurry. When the water content of the solid waste base material is high, a belt or a forklift can be used to load the material and then pass it through a mixing station to make slurry with the hydraulic binder, fiber and water to avoid premature hydration reaction and formation of lumps.

[0058] Furthermore, the method for preparing the hydraulic fluidized solid waste binder as described above comprises the following steps:

[0059] Weighing a solid waste base material, a hydraulic binder, an admixture, and fibers, and mixing the fibers and the admixture to obtain a first mixture;

[0060] Mixing the solid waste base material with a portion of water to obtain a second mixture, and then mixing the remaining water, the hydraulic binder, the first mixture, and the second mixture according to a water-to-solid ratio to obtain a wet hydraulic fluidized solid waste binder;

[0061] The admixture is a combination of triethanolamine and glauber salt, and the weight ratio of triethanolamine to glauber salt is 1:2;

[0062] The weight ratio of the partial water to the remaining water is 8:2.

[0063] In the present application, the surface of the fiber is relatively smooth. By first mixing the fiber and the admixture, in addition to improving the fluidity, the sodium sulfate can be adhered. Even after mixing, part of the sodium sulfate can be retained on the fiber surface, which can improve the early strength effect around the fiber. After coagulation, the mechanical transmission effect is better, which is beneficial to improve the compressive strength of the binder. When used as a roadbed fill, it can better cope with cyclic loads. In addition, the amount of solid waste base material used in the present application is large. In order to maintain the shape of the fiber and avoid damaging the fiber during the mixing process and affecting its length and particle size setting, the solid waste base material is first mixed with part of the water to improve the fluidity and then mixed with the fiber. The shearing effect on the fiber is relatively low. In this way, under the protection of triethanolamine, the fiber can be well distributed in the binder without being damaged, so that its mechanical properties can be well exerted.

[0064] The preparation method of the hydraulic fluid solid waste binder of the present application is simple and efficient, and can be well applied to large-scale cast-in-place. The hydraulic fluid solid waste binder provided by the present application generally has good fluidity. In order to avoid expanding the scope of demolition and requisition and improve casting efficiency, it is generally hardened in conjunction with a vertical roadbed. During the installation of the vertical roadbed, drilling and positioning are generally required, which also involves mud treatment. The hydraulic fluid solid waste binder of the present application has good cementing properties. In this case, mud can also be used instead of water for stirring and mixing, thereby saving water and effectively consuming mud to solve the mud treatment problem.

[0065] The wet hydraulic fluid solid waste binder provided by the present application has good fluidity and self-stabilizing properties. After the preparation of the wet hydraulic fluid solid waste binder, it can be transported and poured by pipeline, or poured by a concrete pump truck. Since there is no foam and no defoaming problem is involved, it can also be transported by a concrete tank truck and directly poured into the project site by means of a chute. Among them, since the prepared wet hydraulic fluid solid waste binder has the characteristics of self-hardening, self-leveling, high fluidity and easy construction, in actual working conditions, preparation and construction can be carried out simultaneously. After solidification, it provides sufficient compressive strength for use as a hydraulic fluid solid waste binder, which can effectively meet the performance requirements of roadbed filling and realize the comprehensive utilization of solid waste resources for road construction.

[0066] The following is further described with reference to specific examples.

[0067] The method for preparing the hydraulic fluidized solid waste binder of the embodiment of the present application comprises the following steps:

[0068] Weighing solid waste base material, cement, blast furnace slag powder, triethanolamine, sodium sulfate and fiber, and mixing the fiber, triethanolamine and sodium sulfate to obtain a first mixture;

[0069] Mixing the solid waste base material with part of the water to obtain a second mixture, and then mixing the remaining water with cement, blast furnace slag powder, the first mixture and the second mixture according to the water-solid ratio to obtain a wet hydraulic fluidized solid waste binder;

[0070] The weight ratio of triethanolamine to sodium sulfate is 1:2; the weight ratio of part water to remaining water is 8:2; the specific surface area of ​​the solid waste base material is 200m 2 / Kg; the fiber is alkali-resistant glass fiber, with a length of 5cm and a diameter of 1mm.

[0071] After preparation, the hydraulic fluidized solid waste binder is subjected to standard curing and performance testing to test the compressive strength.

[0072] The composition and performance test results of the hydraulic fluidized solid waste binder using desulfurized ash as the solid waste base material in Examples 1-5 of the present application are shown in Table 1:

[0073] Table 1

[0074]

[0075] The composition and performance test results of the hydraulic fluidized solid waste binder using phosphogypsum (in some embodiments, carbide slag is added) as the solid waste base material in Examples 6-22 of the present application are shown in Table 2:

[0076] Table 2

[0077]

[0078] The composition and performance test results of the hydraulic fluidized solid waste binder using red mud and desulfurized gypsum as solid waste base materials in Examples 23-26 of the present application are shown in Table 3:

[0079] Table 3

[0080]

[0081] This application can improve the binding properties of hydraulic fluid solid waste binder by adding admixtures. The added fibers can improve the overall strength. The compressive strength of the hydraulic fluid solid waste binder prepared is not less than 0.69 MPa after 28 days of standard curing, which can meet the use requirements of the "Highway Roadbed Design Code" JTG D30-2015, realize the comprehensive utilization of solid waste base materials for roads, effectively reduce costs and reduce pollution.

[0082] It should be understood that the application of this application is not limited to the above examples. For ordinary technicians in this field, they can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of this application.

Claims

1. A hydraulic fluid solid waste binder, characterized in that: Including the following ingredients: (1) Binder composition; the binder composition, calculated in parts by weight, includes: 75-95 parts of solid waste base material, 4-20 parts of hydraulic cementitious material, 0.3-3 parts of admixture, and 0.3-2 parts of fiber; (2) water; the weight ratio of water to the binder composition is 0.4-0.85:1; The fiber has a length of 5 cm and a diameter of 1 mm; The admixture is a combination of triethanolamine and sodium sulfate; The fiber is glass fiber; The glass fiber is alkali-resistant glass fiber; The weight ratio of triethanolamine to sodium sulfate is 1:2; The solid waste base material is one or more of fly ash, desulfurization ash, desulfurization gypsum, red mud, alkali slag, ceramic polishing slag, carbide slag, tailings slag, phosphogypsum and stone saw mud; The specific surface area of ​​the solid waste base material is not less than 200m 2 / Kg.

2. The hydraulic fluidized solid waste binder according to claim 1, characterized in that: The hydraulic cementitious material is one or both of cement and mineral powder.

3. The hydraulic fluidized solid waste binder according to claim 2, characterized in that: The mineral powder is one or both of blast furnace slag powder and ultrafine composite mineral admixture.

4. The hydraulic fluidized solid waste binder according to claim 3, characterized in that: The hydraulic cementitious material is a combination of the cement and blast furnace slag powder, and the weight ratio of the cement to the blast furnace slag powder is 1:0.5-5.

5. The hydraulic fluidized solid waste binder according to claim 4, characterized in that: The cement is one or both of Portland cement and sulfate cement.

6. A method for preparing a hydraulic fluidized solid waste binder according to any one of claims 1 to 5, characterized in that: The following steps are involved: Weighing the solid waste base material, hydraulic binder, admixture and fiber, and mixing the fiber and admixture to obtain a first mixture; Mixing the solid waste base material with a portion of water to obtain a second mixture, and then mixing the remaining water, the hydraulic binder, the first mixture, and the second mixture according to a water-to-solid ratio to obtain a wet hydraulic fluidized solid waste binder; The weight ratio of the partial water to the remaining water is 8:2.

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