CN118459172A - A hydraulic fluid solid waste binder and preparation method thereof - Google Patents

Abstract

The application relates to the technical field of road construction filling materials, in particular to a hydraulic fluid solid waste cementing material and a preparation method thereof. The hydraulic fluid solid waste cementing material comprises: a cement composition; the cementing material composition comprises the following raw materials in parts by weight: solid waste base material: 75-95 parts of solid waste base stock, 4-20 parts of hydraulic cementing material, 0.3-3 parts of additive and 0.3-2 parts of fiber; water; the weight ratio of water to cement composition is 0.4-0.85:1; the length of the fiber is 5cm, and the diameter is 1mm; the additive is the combination of triethanolamine and anhydrous sodium sulfate. The hydraulic fluid solid waste cementing material has good self-compaction and self-hardening characteristics, can realize recycling of a large amount of solid waste materials, has good comprehensive performance after cementing, can be used for replacing traditional discrete materials for road construction or filling, and can realize the comprehensive utilization of solid waste resources.

Description

A hydraulic fluid solid waste binder and preparation method thereof

Technical Field

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

With the continuous progress of my country's infrastructure construction, my country's highway mileage has ranked first in the world and continues to grow. There is still a considerable demand for the use of road filling materials. At present, road construction or pipeline corridors are generally filled with bulk materials such as earth and gravel. Since bulk materials mainly provide strength through friction and bite force between particles, it is difficult to achieve self-stabilization. When used as roadbed filling materials, it is often necessary to slope and fill to form a roadbed. After filling, rolling and compaction are required to meet the use. In addition, natural earth or ash soil is sensitive to moisture content, and construction is easily restricted by the environment and weather. Even after filling, there are still problems of low strength and high loss rate. Moreover, with the increasing environmental protection requirements in the field of transportation civil engineering, high-quality filling resources such as earth or gravel are becoming increasingly scarce, and it is difficult to meet the large-scale use of road construction materials or tailings filling.

Fluid binders are generally based on soil as the main base material, and are mixed with appropriate amounts of hydraulic cementitious materials, certain additives and water, and foam as needed. After being stirred and mixed evenly, they can be transported by pipeline or pumped and self-compacted to form engineering materials with certain strength and self-sustaining stability after solidification and hardening. By applying fluid binders to the field of road filling materials, it can not only reduce the consumption of filling resources, but also achieve better road construction or filling effects after hardening, and is expected to gradually replace the use of sand and gravel materials for filling.

With the acceleration of my country's industrialization process, the current production and stock of solid wastes such as red mud, white mud (alkali slag), fly ash, tailings sand and phosphogypsum are large, and the stock of solid wastes such as construction waste and engineering waste soil is also increasing year by year. These solid wastes not only occupy land, but also cause serious secondary pollution and are difficult to utilize as resources. At present, there is no good comprehensive solution to the large-scale disposal of solid wastes and the scarcity of fill resources for engineering applications. In the existing technology of applying industrial solid waste to concrete, the amount of industrial solid waste is generally low, and large-scale resource utilization cannot be achieved. Once the amount of industrial solid waste is increased, it is difficult to ensure the overall performance of concrete. After the slurry is made, there is often a problem of poor workability, which is not conducive to large-scale cast-in-place. In addition, the effect of coagulation and hardening is general, and the heavy metal ions present in some solid wastes cannot be fixed. If it is not solved, it is easy to cause the land or farmland on the roadside to be polluted. Therefore, the existing technology needs to be improved and developed.

Summary of the invention

In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a hydraulic fluid 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.

The technical solution of this application is as follows:

In a first aspect, the present application provides a hydraulic fluid solid waste binder, which includes the following raw materials:

(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 additive is a combination of triethanolamine and sodium sulfate.

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 loose 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 industry.

Further, the fiber is one of polypropylene fiber and glass fiber;

The glass fiber is alkali-resistant glass fiber.

Furthermore, the weight ratio of the triethanolamine to the sodium sulfate is 1:2.

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

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

Furthermore, 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.

Furthermore, the cement is one or more of Portland cement, ordinary Portland cement or sulfate cement.

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.

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

In a second aspect, the present application provides a method for preparing the hydraulic fluid solid waste binder as described in the first aspect, which comprises the following steps:

Weighing the solid waste base material, hydraulic cementitious material, admixture and fiber, and mixing the fiber and admixture to obtain a first mixture;

The solid waste base material is mixed with a portion of water to obtain a second mixture, and the remaining water, the hydraulic binder, the first mixture and the second mixture are mixed according to a water-to-solid ratio to obtain a wet hydraulic fluidized solid waste binder composition;

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

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

Beneficial effects: This application can consolidate the solid waste base material of the large component in the hydraulic fluid solid waste binder by using hydraulic cementing materials and fibers, and can also stabilize the heavy metal ions existing in some solid wastes after coagulation, thereby reducing the risk of pollution. The hydraulic fluid solid waste binder provided has the characteristics of bulk density, strength regulation, self-compacting and self-hardening, and does not require rolling and compaction operations. It can be easily applied to vertical roadbeds and can 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

The present application provides a hydraulic fluid solid waste binder and a preparation method thereof. To make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

The present application provides a hydraulic fluid solid waste binder, which includes the following raw materials:

(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 hydraulic fluid solid waste binder provided in 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 a 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 casting, which is convenient for construction, and the strength retention effect after hardening is good.

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, and 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. 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 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.

Further, the fiber is one of glass fiber and polypropylene fiber. Glass fiber is more preferred, which 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.

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 also further weaken the fiber effect after the reaction, and the mechanical properties in the binder are limited. By using fibers of suitable length and diameter, the fiber morphology is maintained while participating in a certain hydration reaction for bonding, and the mechanical transfer effect is better while improving the toughness, which is beneficial to improving the overall mechanical properties of the hydraulic fluid solid waste binder. By improving the toughness, it is also beneficial for the hydraulic fluid solid waste binder to have good elastic recovery, and the compressive and fatigue resistance can be improved.

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 significant 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. The performance of the hydraulic fluid solid waste binder can be significantly improved by adding admixtures, wherein the use of triethanolamine can improve fluidity, reduce the water-solid ratio, and improve the workability of the binder. The use of sodium sulfate can play an early strength role, accelerate the coagulation of the binder, and the strength and durability of the binder after coagulation are improved, thereby improving the working performance. Among them, the weight percentage 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.

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 the early strength effect on the fibers and the remaining components. By first performing a hydration reaction on the fibers to generate crystals, the compactness near the fibers is increased, and the reinforcing effect of the fibers in the hydraulic fluid solid waste binder is further improved.

Furthermore, the hydraulic cementitious material is one or two of cement and mineral powder. Different from the characteristic that bulk materials are difficult to stabilize themselves, the present application uses hydraulic cementitious materials to bond and consolidate solid waste base materials to form hydraulic fluid solid waste binder, and constrains each component through van der Waals force. After hardening, the hydraulic fluid solid waste binder can maintain the filling effect and provide strength for a long time, and the overall strength is also higher.

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

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, cement and blast furnace slag powder are used 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 requirement of the hydraulic fluid solid waste binder of the present application is lower than that of structural concrete, and no additional stimulant is added, if the amount of blast furnace slag powder is continued to be increased, the activity of the remaining blast furnace slag powder cannot be fully exerted, but it will affect the early strength of the hydraulic fluid solid waste binder and the overall strength after curing. Therefore, it is necessary to control the amount of blast furnace slag powder used within a certain range, which is conducive to maintaining the strength of the hydraulic fluid solid waste binder while reducing material costs.

In the present application, the weight percentage of hydraulic cementitious materials in the binder composition is 4-20 parts. The solid waste base material selected in the present application is generally mainly composed of silicon, aluminum or calcium. The hydration reaction of the hydraulic cementitious materials can form a spatial network structure to wrap, connect and compact the soil particles of the solid waste base material. In addition, the selected solid waste base material generally has certain active ingredients that can participate in the hydration reaction and play a synergistic role. Therefore, the weight percentage of hydraulic cementitious materials in the binder composition is 4-20 parts, which can meet the strength requirements of road filling and reduce costs.

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

Furthermore, the solid waste base material is one or more of fly ash, desulfurization ash, desulfurization gypsum, red mud, alkali slag, ceramic polishing slag, aluminum ash, carbide slag, tailings slag, phosphogypsum and stone saw mud (limestone powder). The solid waste base material selected for this application is industrial solid waste, which can generally be reused according to local solid waste resources. Among them, the properties of different solid waste base materials are also different. The amount of hydraulic cementitious material used in the actual preparation and the water-solid ratio in the preparation can be adjusted to a certain extent.

Furthermore, the specific surface area of the solid waste base material is not less than ^200m2 /Kg. As a major 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 conducive to pouring. Under a suitable 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 a higher activity, and after hardening, it can improve the overall bonding 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. The solid waste base material with a larger particle size generally has a microporous structure, which is easy to defoam the foam. Therefore, controlling the particle size of the solid waste base material is also conducive to stabilizing the foam during foaming and reducing the risk of defoaming.

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 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: 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. In the coagulation process of the hydration reaction, a large amount of alkali slag can also provide an alkaline environment, and the calcium component of the alkali slag can also form a hydration product after the hydration reaction, and the density is also relatively high. The strength of the hydraulic fluid solid waste binder prepared by alkali slag is also relatively higher.

For example, the main component of red mud is silicon, which 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 the solid waste base material uses red mud and desulfurized gypsum, the hydraulic fluid solid waste binder of the present application includes: (1) binder composition; the binder composition is calculated by weight and includes the following raw materials: 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 binder performance of red mud is improved. The hydraulic fluid solid waste binder obtained also has a sufficiently high compressive strength after coagulation, which can effectively solve the problem of red mud treatment.

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, the strength of the hydraulic fluid solid waste binder can be improved. When the solid waste base material uses phosphogypsum and carbide slag, the hydraulic fluid solid waste binder of the present application includes: (1) a binder composition; the binder composition, calculated by weight, includes the following raw materials: 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 the binder composition is 0.4-0.5:1. In the hydraulic fluid solid waste binder, by adding a certain amount of carbide slag, it can play an exciting role, especially when the amount of blast furnace slag powder in the hydraulic binder is high, the activity can be well stimulated, and the later strength enhancement effect of blast furnace slag powder can be improved, and the strength after complete solidification is higher. By using phosphogypsum as a base material, due to the large amount of phosphogypsum, there may be a certain volume expansion after long-term use after solidification. The amount of phosphogypsum can be replaced by a part of the shrinkable dry soil to suppress the degree of deformation while maintaining sufficient strength. The amount of dry soil is 15-30 parts.

For example, the desulfurized ash has good cementing properties and has high strength after solidification through hydraulic cementitious materials. At the same time, the desulfurized ash has good sphericity and moderate fluidity when the water-solid ratio meets the requirements. It has good pouring performance, better self-leveling performance and better cementing effect after pouring. Whether it is used alone or mixed with other solid wastes, it can also improve the cementing properties. When fly ash and desulfurized ash 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, calculated by weight, includes the following raw materials: 50-70 parts of fly ash, 25-30 parts of desulfurized ash, 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 0.4-0.5:1. Fly ash is prone to shrinkage and cracking when used in high dosages. By compounding it with expansive desulfurization ash, the drying and cracking phenomenon of fly ash can be addressed and the performance of the hydraulic fluid solid waste binder can be improved.

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) 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 of weathering, thereby improving the performance and service life of the hydraulic fluid solid waste binder.

The hydraulic fluid solid waste binder provided by this application can realize the reuse of a large amount of industrial solid waste while meeting the needs of road filling, which can effectively solve the problem of industrial solid waste disposal. Moreover, through the water-solid ratio and the consolidation effect of the hydration reaction provided by this application, the heavy metal content in the solid waste base material can be effectively diluted. According to the standards for Class II construction land, after hardening, it can also meet the heavy metal content requirements of the "Standards for Soil Pollution Risk Control of Construction Land" GB36600-2018.

The hydraulic fluid solid waste binder provided by the present application is a new type of roadbed filler, which can solve the problem of solid waste raw material disposal on a large scale. By mixing water to participate in the hydration reaction, the shape can be self-stabilized and vertically filled after hardening and bonding, and the construction conditions are little affected by the weather. Compared with traditional earthwork materials, it is low in cost, economical and practical, easy to construct, can be cast in place on a large scale, has good performance after bonding, can meet the use requirements of filling materials, and can replace traditional earthwork as the main filling material for roadbed on a large scale.

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

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

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

After the wet hydraulic fluid solid waste binder composition is prepared, it can be subjected to coagulation and hardening to obtain a hydraulic fluid solid waste binder.

Among them, the solid waste base material and water can be mixed and slurried 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 slurry of the hydraulic fluid solid waste binder 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 cementing material 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 slurry it with the hydraulic cementing material, fiber and water through a mixing station to avoid premature hydration reaction and the formation of lumps.

Furthermore, the method for preparing the hydraulic fluid solid waste binder as described above comprises the following steps:

Weighing a solid waste base material, a hydraulic cementitious material, an admixture, and fibers, and mixing the fibers and the admixture to obtain a first mixture;

Mixing the solid waste base material and part of the water to obtain a second mixture, and then mixing the remaining water and the hydraulic binder, the first mixture and the second mixture according to the water-to-solid ratio to obtain a wet hydraulic fluidized solid waste binder composition;

The admixture is a combination of triethanolamine and sodium sulfate, and the weight ratio of triethanolamine to sodium sulfate is 1:2;

The weight ratio of partial water to remaining water is 8:2.

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 transfer effect is better, which is beneficial to improve the compressive strength of the binder. When used as a roadbed filling, it can better cope with cyclic loads. In addition, the amount of solid waste base material used in the present application is relatively large. In order to maintain the shape of the fiber and avoid damaging the fiber during the mixing process to affect 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, the fiber can be well distributed in the binder without being damaged under the protection of triethanolamine, so that its mechanical properties can be well exerted.

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. Among them, 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 the casting efficiency, it is generally hardened with a vertical roadbed. When installing the vertical roadbed, it is generally necessary to drill holes for positioning and fixation, which also involves the treatment of mud. The hydraulic fluid solid waste binder of the present application has good bonding performance. At this time, mud can also be used to replace water for stirring and mixing, thereby saving water and effectively consuming mud to solve the problem of mud treatment.

The wet hydraulic fluid solid waste binder composition provided by the present application has good fluidity and self-stabilizing performance. After the preparation, the wet hydraulic fluid solid waste binder composition can be transported and poured by pipeline, or poured by concrete pump truck, because there is no foam and no defoaming problem is involved. It can also be transported by concrete tank truck and directly cast to the engineering site by chute. Among them, since the prepared wet hydraulic fluid solid waste binder composition 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 coagulation, 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.

The invention is further described below by means of specific examples.

The method for preparing the hydraulic fluid solid waste binder of the embodiment of the present application comprises the following steps:

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;

The solid waste base material is mixed with a portion of water to obtain a second mixture, and the remaining water, cement, blast furnace slag powder, the first mixture and the second mixture are mixed according to the water-to-solid ratio to obtain a wet hydraulic fluidized solid waste binder composition;

The weight ratio of triethanolamine to sodium sulfate is 1:2; the weight ratio of partial water to residual 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.

After preparation, the hydraulic fluid solid waste binder composition is subjected to standard curing and a performance test is performed to test the compressive strength.

The composition and performance test results of the hydraulic fluid 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:

Table 1

The composition and performance test results of the hydraulic fluid solid waste binder using phosphogypsum (some embodiments add carbide slag) as the solid waste base material in Examples 6-22 of the present application are shown in Table 2:

Table 2

The composition and performance test results of the hydraulic fluid 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:

The application can improve the binding properties of hydraulic fluid solid waste binder by adding admixtures, and the added fibers can improve the overall strength. The compressive strength of the hydraulic fluid solid waste binder prepared is not less than 0.69MPa after standard curing for 28 days, 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.

It should be understood that the application of the present application is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description, and all these improvements and changes should fall within the scope of protection of the present application.

Claims (10)

1. The hydraulic fluid solid waste cementing material is characterized by comprising the following raw materials:

(1) A cement composition; the cementing material composition comprises the following components in parts by weight:

75-95 parts of solid waste base stock, 4-20 parts of hydraulic cementing material, 0.3-3 parts of additive and 0.3-2 parts of fiber;

(2) Water; the weight ratio of water to cement composition is 0.4-0.85:1;

the length of the fiber is 5cm, and the diameter is 1mm;

The additive is the combination of triethanolamine and anhydrous sodium sulfate.

2. The hydraulic fluid solid waste cement according to claim 1, wherein the fiber is one of polypropylene fiber and glass fiber;

the glass fiber is alkali-resistant glass fiber.

3. The hydraulic fluid solid waste cement according to claim 2, wherein the weight ratio of triethanolamine to anhydrous sodium sulfate is 1:2.

4. The hydraulic fluid solid waste cement according to claim 2, wherein the hydraulic cement is one or both of cement and mineral powder.

5. The hydraulic fluid solid waste cement according to claim 4, wherein the fine ore is one or both of blast furnace slag powder and an ultrafine composite mineral admixture.

6. The hydraulic fluid solid waste cement according to claim 5, wherein the hydraulic cement 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.

7. The hydraulic fluid solid waste cement according to claim 6, wherein the cement is one or more of Portland cement, portland cement and sulfate cement.

8. The hydraulic fluid solid waste cement according to claim 1, wherein the solid waste binder is one or more of fly ash, desulfurized gypsum, red mud, alkaline residue, ceramic polishing residue, carbide residue, tailing residue, phosphogypsum and stone sawing mud.

9. The hydraulic fluid solid waste cement according to claim 8, wherein the specific surface area of the solid waste binder is not less than 200m ²/Kg.

10. A method of preparing a hydraulic fluid solid waste cement according to any one of claims 1 to 9, comprising the steps of:

weighing the solid waste base material, the hydraulic cementing material, the additive and the fiber, and mixing the fiber and the additive to obtain a first mixture;

Mixing the solid waste base material with part of water to obtain a second mixture, and mixing the rest water with the hydraulic cementing material, the first mixture and the second mixture according to the water-solid ratio to obtain a wet hydraulic fluid solid waste cementing material composition;

The additive is a combination of triethanolamine and anhydrous sodium sulphate, and the weight ratio of the triethanolamine to the anhydrous sodium sulphate is 1:2;

The weight ratio of the partial water to the residual water is 8:2.