CN110482995B - Environment-friendly type solid sulfur ash-fly ash compound de-air grouting material and preparation method and application thereof - Google Patents
Environment-friendly type solid sulfur ash-fly ash compound de-air grouting material and preparation method and application thereof Download PDFInfo
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- CN110482995B CN110482995B CN201910711658.6A CN201910711658A CN110482995B CN 110482995 B CN110482995 B CN 110482995B CN 201910711658 A CN201910711658 A CN 201910711658A CN 110482995 B CN110482995 B CN 110482995B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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Abstract
The invention provides a kind of solid sulfur ash-The fly ash compounded environment-friendly type void grouting material comprises the fly ash, a curing agent, an early strength agent, a water reducing agent, a defoaming agent, an expanding agent and water. In terms of performance, the invention can realize the adjustable and controllable strength of the grouting material by adjusting the proportion of the solid sulfur ash, the fly ash and the curing agent in the formula; the characteristics of high early strength and short curing time can be realized through the contents of the auxiliary agent component and the curing agent component. Meanwhile, the invention adopts industrial solid wastes such as solid sulfur ash, fly ash and the like, thereby meeting the national development requirement on environmental protection. Compared with the commonly used cement-based grouting material in the market at present, the grouting material provided by the invention has no dry shrinkage phenomenon after being cured, keeps micro-expansion of volume and has excellent dry shrinkage resistance. The cost of the grouting material is less than 180 yuan/m3The cost performance is greatly improved, and great economic benefit and social benefit are achieved.
Description
Technical Field
The invention belongs to the field of road engineering, bridge engineering and tunnel engineering materials, and particularly relates to a fluidized bed combustion ash residue-fly ash compound environment-friendly type void grouting material, and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The road can be damaged to different degrees under the long-term action of traffic load and environmental factors. The roadbed mainly comprises deformation sinking, void, slurry turning and the like; there are cracks, pits, irregularities in the road surface, and the like. On one hand, road damage is generated, so that road performance is reduced, driving comfort is influenced, and traffic accidents may be caused seriously; on the other hand, the service life of the road is greatly shortened, and the engineering economic benefit is influenced. The roadbed diseases are generally difficult to find, and if the roadbed diseases are not treated in time, the roadbed diseases can be generated and worsened, and further the roadbed diseases are expressed in the form of the roadbed diseases.
At present, the grouting technology is increasingly used in the fields of roadbed filling, foundation reinforcement, underground engineering reinforcement and the like. The most widely used grouting materials at present are inorganic grouting materials using cement-based materials as main agents. The cement-based grouting material has high mechanical property and mature process, and the cement slurry can meet the grouting requirement under most geological conditions. But in the aspect of performance, the defects of long initial setting time, difficult control, low early strength, high water precipitation rate, easy collapse, difficult filling of micro cracks and the like exist; in the aspect of cost performance, with the continuous improvement of national environmental protection requirements, the shortage of cement manufacturing base materials and the continuous updating of production processes, the price of the cement is greatly increased. The engineering maintenance cost in the fields of road engineering, bridge engineering, tunnel engineering and the like with large grouting material consumption is greatly increased.
The industrial scale of China is huge, the industrial solid waste output is large, and the comprehensive utilization of the industrial solid waste needs to be solved urgently. The solid sulfur ash is industrial fixed waste generated in a fluidized bed coal burning technology in a power plant. At present, the annual emission of coal-fired solid sulfur ash in a fluidized bed is about 8000W tons. In terms of the current national conditions and energy status of China, the fire coal still serves as an important energy basis of China, so the discharge amount of the solid sulfur ash is high. At present, the discharge amount and the inventory amount of the solid sulfur ash are large, but the utilization rate is low. Therefore, if the solid sulfur clinker can be applied to highway engineering construction in a large scale, the method is beneficial to environmental protection and can effectively utilize resources.
In the research and development of grouting materials, many scholars at home and abroad carry out related researches. Patent CN109627420A discloses a water-resistant organic grouting material for repairing semi-rigid base cracks, which is composed of a component a (composite polyol, hygroscopic agent, etc.) and a component B (PAPI-2 type isocyanate) and is used for repairing semi-rigid base cracks. Patent CN109608143A discloses a quick-setting early strength cement-water glass double-liquid grouting material and a use method thereof, which can be applied to the advanced grouting reinforcement of surrounding rocks of broken roofs to prevent roof collapse during roadway excavation and improve the roadway excavation efficiency. Patent CN106543688B discloses an organic/inorganic nano composite grouting material and a preparation method thereof, and provides guarantee for the safety of a mining reinforcing material by compounding a nano toughening modifier, organic polyisocyanate and the like in the material. Patent CN109354461A discloses a high polymer composite grouting material and a preparation method thereof, which comprehensively utilizes a rubber cement, polyether polyol, epoxidized soybean oil and ordinary portland cement to solve engineering problems of coal goafs, highway goafs, road surface collapse, subgrade subsidence, dam water plugging, roof water leakage and the like. Patent CN109437815A discloses an emulsified asphalt compounded red mud-boron mud filling and grouting material and a preparation method thereof, which comprehensively utilizes industrial solid wastes such as red mud, boron mud and the like. The inventor finds that the grouting material in the above listed patents or the need to be filled with organic substances has certain influence on the roadbed raw material; or the cement is still used as the main matrix, so that the cost performance is not greatly reduced; or the solid wastes are mainly used as the main components of the grouting material, so that the defects of poor adhesive force, poor dry shrinkage resistance, insufficient strength control and the like exist.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a sulfur fixation clinker-fly ash compound environment-friendly type void grouting material, a preparation method and application thereof. In the aspect of performance, the void grouting material prepared by the invention can effectively solve the engineering problem caused by road void, and has high early strength, adjustable and controllable strength; in the aspect of material source, the void grouting material consists of the solid sulfur ash, the fly ash, the curing agent and a series of auxiliary agents, fully utilizes industrial solid wastes such as the solid sulfur ash, the fly ash and the like, and is matched with the cement-based grouting material commonly used in the market at present (the cost is about 300-400 yuan/m)3) Compared with the existing cement-based grouting material on the market, the grouting material disclosed by the invention has the advantages that a certain volcanic ash activity of the sulfur-fixing ash slag is fully utilized, and an expanding agent is additionally matched for use, so that the grouting material can slightly expand in volume in the blending use process, and the phenomenon of shrinkage after solidification is avoided. Meanwhile, the cost of the grouting material is less than 180 yuan/m3The cost performance is greatly improved, and the method has great economic benefit and social benefit; in the aspect of construction application, the invention has the advantages of simple construction and convenient operation, and can effectively reduce the number of personnel required by construction, improve the efficiency and reduce the maintenance cost of road void. Therefore, has good practical applicationThe value of the composition.
The invention aims to provide a sulfur-fixing clinker-fly ash compound environment-friendly type void grouting material.
The invention also aims to provide a preparation method of the sulfur-fixing ash-fly ash compound environment-friendly type void grouting material.
The invention also aims to provide the application of the sulfur fixation ash-fly ash compound environment-friendly type void grouting material in the void treatment of the road bridge head butt strap.
The invention is realized by the following technical scheme:
the invention provides a first aspect of a fluidized bed combustion ash residue-fly ash compound environment-friendly type void grouting material, which comprises:
the cement clinker, fly ash, a curing agent, an early strength agent, a water reducing agent, a defoaming agent, an expanding agent and water.
The concrete admixture is further limited by comprising, by mass, 30-80 parts of solid sulfur ash, 20-40 parts of fly ash, 20-60 parts of a curing agent, 1-4 parts of an early strength agent, 2-6 parts of a water reducing agent, 1-4 parts of a defoaming agent, 0.01-0.03 part of an expanding agent and 25-60 parts of water.
By way of further limitation, the curing agent is composed of water glass, slaked lime, caustic soda, ordinary portland cement and plaster of paris, and the weight ratio of the water glass: slaking lime: caustic soda: ordinary portland cement: 10-40% of calcined gypsum: 0-30: 5-25: 20-60: 30 to 50.
By way of further limitation, the early strength agent is a mixture of one or more of calcium chloride, sodium chloride, aluminum chloride and lithium chloride.
By way of further limitation, the water reducing agent is a mixture of one or more of lignosulfonate, naphthalene sulfonate formaldehyde polymer, polycyclic aromatic salt or polycarboxylic acid.
By way of further limitation, the defoamer is a mixture of one or more of mineral oils, polyethers, silicones, or fatty alcohols.
By way of further limitation, the expanding agent is one or a mixture of more of calcium sulphoaluminates, calcium oxide-calcium sulphoaluminates, calcium oxides or aluminium powder.
The second aspect of the invention provides a preparation method of the sulfur-fixing ash-fly ash compound environment-friendly type void grouting material, which comprises the following steps:
(1) weighing the sulfur fixation ash slag and the fly ash according to the amount, wherein the sulfur fixation ash and the fly ash are screened; crushing, grinding and screening the solid sulfur slag; heating the sieved solid sulfur ash, the pulverized fuel ash and the crushed solid sulfur slag for oxygen-free high-temperature activation; then cooling to room temperature, and mixing uniformly to obtain the component A.
(2) Weighing the early strength agent, the water reducing agent, the defoaming agent, the expanding agent and water according to the amount, and mechanically stirring uniformly to obtain the auxiliary agent B component.
(3) Weighing water glass, slaked lime, caustic soda, ordinary portland cement and plaster of paris according to the amount, and mechanically stirring uniformly to prepare the curing agent component C.
(4) In the construction, the component A, the component B and the component C are mixed and stirred uniformly according to the weight ratio of 0.8-1.5: 0.08-0.25: 0.4-0.6, and then injected into a void part needing to be repaired by adopting a grouting mode.
The third aspect of the invention provides the application of the fluidized bed combustion ash residue-fly ash compound environment-friendly type emptying grouting material in the emptying treatment of the bridge head butt strap of the highway.
Compared with the prior art, the invention has the beneficial effects that:
(1) in the formula and the preparation process of the void grouting material provided by the invention, the strength of the grouting material can be effectively adjusted and controlled by adjusting the proportion of the solid sulfur ash, the fly ash and the curing agent C in the component A; meanwhile, the grouting material fully utilizes certain volcanic ash activity of the solid sulfur ash, and in addition, by matching with the use of an expanding agent, extremely fine micro-bubbles are formed in the matrix, so that the grouting material can keep volume micro-expansion in the using process, and has no dry shrinkage phenomenon after being cured.
(2) The grouting material provided by the invention adopts industrial solid wastes such as solid sulfur ash, fly ash and the like, has low price and large reserves, and solves the problem of solving the problem of ChinaThe method has the advantages of energy conservation and environmental protection, and meets the national development requirement on environmental protection. Compared with the cement-based grouting material commonly used in the market at present (the cost is about 300-400 yuan/m)3) Compared with the prior art, the grouting material has the cost less than 180 yuan/m3The cost performance is greatly improved, and great economic benefit and social benefit are achieved.
(3) The void-free grouting material has the characteristics of high early strength and short curing time under the action of the auxiliary agent component B and the curing agent component C; therefore, it has good practical application value.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It is to be understood that the scope of the invention is not to be limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. The experimental procedures, if specific conditions are not indicated in the following detailed description, are generally in accordance with conventional procedures and conditions of molecular biology within the skill of the art, which are fully explained in the literature.
The existing grouting material or organic substances need to be filled, so that a certain influence is generated on the roadbed raw material; or the cement is still used as the main matrix, so that the cost performance is not greatly reduced; or the solid wastes are mainly used as the main components of the grouting material, so that the defects of poor binding power and insufficient flexibility in strength control exist.
In view of the above, in a specific embodiment of the present invention, in a first aspect of the present invention, there is provided an environmentally friendly solid sulfur ash-fly ash compound de-air grouting material, comprising:
the cement clinker, fly ash, a curing agent, an early strength agent, a water reducing agent, a defoaming agent, an expanding agent and water.
In another embodiment of the invention, the fluidized bed combustion ash-fly ash compound environment-friendly type void grouting material comprises the following components in parts by mass: 30-80 parts of sulfur fixation ash, 20-40 parts of fly ash, 20-60 parts of curing agent, 1-4 parts of early strength agent, 2-6 parts of water reducing agent, 1-4 parts of defoaming agent, 0.01-0.03 part of expanding agent and 25-60 parts of water.
The ash slag of the solid sulfur contains more anhydrous gypsum and CaO, has the characteristic of hydration expansion at normal temperature, and has higher activity of the volcanic ash and smaller reaction resistance. The main oxide composition of the fly ash is as follows: SiO 22、Al2O3、FeO、Fe2O3And the like. The activity of the solid sulfur ash is fully exerted in the environment-friendly type de-air grouting material of the solid sulfur ash-fly ash compound, the grading complementation is formed between the solid sulfur ash and the fly ash by utilizing the grain diameter difference, and the strength is adjusted by utilizing the difference of main components and contents. The reasonable utilization of the two industrial solid wastes of the solid sulfur ash slag and the fly ash can effectively improve the workability among materials and fully play the synergistic improvement role of the two.
In another embodiment of the invention, the sulfur-fixing ash residue comprises sulfur-fixing ash and sulfur-fixing slag, wherein the sulfur-fixing ash refers to the specific surface area range of more than 400m after being subjected to screening treatment2Per kg; the sulfur-fixing slag refers to that the surface area of the sulfur-fixing slag is 260-480 m after primary crushing, grinding and screening2/kg。
In another embodiment of the invention, the fly ash refers to the specific surface area range of more than 400m after being subjected to screening treatment2/kg；
In another embodiment of the present invention, the curing agent is composed of water glass, slaked lime, caustic soda, ordinary portland cement, and plaster of paris, and the weight ratio of the water glass: slaking lime: caustic soda: ordinary portland cement: 10-40% of calcined gypsum: 0-30: 5-25: 20-60: 30 to 50.
The curing agent can fully play the advantages of hardening, curing or enhancing of the water glass, the slaked lime, the caustic soda, the common portland cement and the plaster of paris, and effectively improves and adjusts the strength and the hardness of the void grouting material by adjusting the proportion between the curing agent and the sulfur-fixing clinker and the fly ash.
In another embodiment of the present invention, the early strength agent is one or more of calcium chloride, sodium chloride, aluminum chloride, and lithium chloride.
In another embodiment of the present invention, the water reducing agent is one or more of lignosulfonate, naphthalene sulfonate formaldehyde polymer, polycyclic aromatic salt or polycarboxylic acid.
In yet another embodiment of the present invention, the defoamer is a mixture of one or more of mineral oils, polyethers, silicones, or fatty alcohols.
In yet another embodiment of the present invention, the expanding agent is a mixture of one or more of calcium thioaluminates, calcium oxide-calcium thioaluminates, calcium oxides or aluminum powder.
In another embodiment of the invention, a preparation method of the fluidized bed combustion boiler ash-fly ash compound environment-friendly type de-air grouting material is provided, which comprises the following steps:
(1) weighing the sulfur fixation ash slag and the fly ash according to the amount, wherein the sulfur fixation ash and the fly ash are screened; crushing, grinding and screening the solid sulfur slag; heating the sieved solid sulfur ash, the pulverized fuel ash and the crushed solid sulfur slag for oxygen-free high-temperature activation; then cooling to room temperature, and mixing uniformly to obtain the component A.
(2) Weighing the early strength agent, the water reducing agent, the defoaming agent, the expanding agent and water according to the amount, and mechanically stirring uniformly to obtain the auxiliary agent B component.
(3) Weighing water glass, slaked lime, caustic soda, ordinary portland cement and plaster of paris according to the amount, and mechanically stirring uniformly to prepare the curing agent component C.
(4) In the construction, the component A, the component B and the component C are mixed and stirred uniformly according to the weight ratio of 0.8-1.5: 0.08-0.25: 0.4-0.6, and then injected into a void part needing to be repaired by adopting a grouting mode.
It should be noted that, the steps (1), (2) and (3) are not described in sequence.
In still another embodiment of the present invention, in the step (1),
sieving the sulfur fixation ash and the fly ash by 1-3 mm, wherein the specific surface area of the sulfur fixation ash and the fly ash is more than 400m2/kg；
The specific method for crushing, grinding and screening the sulfur-fixing slag comprises the following steps: primarily crushing the sulfur-fixing slag, grinding for 20-40 minutes, screening, and taking out the specific surface area of 260-480 m2Per kg of solid sulphur slag powder;
the oxygen-free high-temperature activation specific conditions are as follows: heating for 3-5 h at 500-600 ℃; the oxygen-free high temperature activation process can be completed in an oxygen-free high temperature furnace.
In another specific embodiment of the invention, the application of the fluidized bed combustion ash residue-fly ash compound environment-friendly type emptying grouting material in the emptying of the road bridge head butt strap is provided.
The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
The preparation method of the sulfur fixation ash-fly ash compound environment-friendly type void grouting material comprises the following steps:
(1) 30g of solid sulfur ash and 40g of fly ash are weighed and respectively sieved by 1mm, and a sieved sample is reserved. Weighing 40g of solid sulfur slag, primarily crushing the solid sulfur slag, grinding for 40 minutes by using a ball mill, screening by using a 2mm sieve, and taking the specific surface area of 260-480 m2Per kg of solid sulphur slag powder.
(2) And (3) heating the sample in an oxygen-free high-temperature furnace at 500 ℃ for 3h, and performing high-temperature activation. Then cooling to room temperature, stirring and mixing uniformly to obtain the component A.
(3) Weighing 1g of early strength agent calcium chloride, 2.5g of water reducing agent polycyclic aromatic salt, 1.0g of defoaming agent polyether, 0.02g of expanding agent aluminum powder and 25g of water according to the weight, and mechanically stirring uniformly to prepare the auxiliary agent B component.
(4) Respectively weighing 10g of water glass, 10g of slaked lime, 20g of caustic soda, 20g of ordinary portland cement and 30g of plaster of paris according to the weight, and mechanically stirring uniformly to obtain the curing agent component C.
(5) In the construction process, the component A, the component B and the component C are uniformly mixed and stirred according to the weight percentage of 1:0.08:0.6, then the mixture is partially poured into a mold, and the 3-day compressive strength, the 7-day compressive strength, the 28-day compressive strength, the flexural strength and the curing volume shrinkage ratio of the mixture are measured. And injecting the mixture into a void needing to be repaired through a grouting pipe.
Table 1 example 1 performance index
Example 2
The preparation method of the sulfur fixation ash-fly ash compound environment-friendly type void grouting material comprises the following steps:
(1) 60g of solid sulfur ash and 30g of fly ash are weighed and respectively sieved by 1mm, and a sieved sample is reserved. Weighing 60g of solid sulfur slag, primarily crushing the solid sulfur slag, grinding for 40 minutes by using a ball mill, screening by using a 2mm sieve, and taking the specific surface area of 260-480 m2Per kg of solid sulphur slag powder.
(2) And (3) heating the sample in an oxygen-free high-temperature furnace at 500 ℃ for 3h, and performing high-temperature activation. Then cooling to room temperature, stirring and mixing uniformly to obtain the component A.
(3) Weighing 2g of early strength agent sodium chloride, 2g of water reducing agent polycarboxylic acid, 3.0g of defoaming agent organic silicon, 0.01g of expanding agent calcium sulphoaluminate and 40g of water according to the weight, and mechanically stirring uniformly to prepare the auxiliary agent component B.
(4) 40g of water glass, 0g of slaked lime, 20g of caustic soda, 40g of ordinary portland cement and 40g of plaster of paris are weighed according to the weight respectively and stirred evenly by a machine to prepare the curing agent component C.
(5) In the construction process, the component A, the component B and the component C are mixed and stirred uniformly according to the weight percentage of 1.5:0.15:0.4, then the mixture is poured into a mold, and the 3-day compressive strength, the 7-day compressive strength, the 28-day compressive strength, the flexural strength and the curing volume shrinkage ratio are measured. And injecting the mixture into a void needing to be repaired through a grouting pipe.
Table 2 example 2 performance index
Example 3
The preparation method of the sulfur fixation ash-fly ash compound environment-friendly type void grouting material comprises the following steps:
(1) weighing 80g of solid sulfur ash and 40g of fly ash, respectively sieving by 2mm, and reserving a sieved sample. Weighing 80g of solid sulfur slag, primarily crushing the solid sulfur slag, grinding for 20 minutes by using a ball mill, screening by using a 1mm sieve, and taking the specific surface area of 260-480 m2Per kg of solid sulphur slag powder.
(2) And (3) heating the sample in an oxygen-free high-temperature furnace at 500 ℃ for 5h, and performing high-temperature activation. Then cooling to room temperature, stirring and mixing uniformly to obtain the component A.
(3) Weighing 4g of early strength agent aluminum chloride, 6g of water reducing agent lignosulfonate, 4.0g of defoaming agent fatty alcohol, 0.03g of expanding agent aluminum powder and 60g of water according to the weight, and mechanically stirring uniformly to prepare the auxiliary agent B component.
(4) Respectively weighing 10g of water glass, 30g of slaked lime, 60g of caustic soda, 60g of ordinary portland cement and 50g of plaster of paris according to the weight, and mechanically stirring uniformly to obtain the curing agent component C.
(5) In the construction process, the component A, the component B and the component C are mixed and stirred uniformly according to the weight percentage of 0.8:0.25:0.6, then the mixture is poured into a mold, and the 3-day compressive strength, the 7-day compressive strength, the 28-day compressive strength, the flexural strength and the curing volume shrinkage ratio are measured. And injecting the mixture into a void needing to be repaired through a grouting pipe.
Table 3 example 3 performance index
Comparative example 1
The preparation method of the environment-friendly type de-air grouting material with the fluidized bed combustion ash residue and the fly ash is the same as that of the embodiment 1, and is different from the embodiment 1 only in that the fluidized bed combustion ash residue is not added.
Comparative example 2
The preparation method of the environment-friendly type solid sulfur ash-fly ash compound de-air grouting material is the same as that of the embodiment 1, and is different from the embodiment 1 only in that no expanding agent is added.
Comparative example 3
Compared with the example 1, the preparation method of the solid sulfur ash-fly ash compound environment-friendly type void grouting material is the same as the example 1, and only the difference is that water glass, slaked lime and caustic soda are not added.
The properties of the void-free grouting agglomerates obtained in comparative examples 1 to 3 are shown in Table 4.
TABLE 4
| Performance of | Unit of | Comparative example 1 value | Comparative example 2 value | Comparative example 3 value |
| Initial setting time | min | 100 | 62 | 110 |
| Final setting time | min | 300 | 180 | 405 |
| 3d compressive strength | MPa | 3.01 | 7.21 | 2.32 |
| 7d compressive strength | MPa | 5.56 | 10.45 | 4.09 |
| 28d compressive strength | MPa | 8.82 | 20.89 | 6.67 |
| 3d flexural strength | MPa | 0.73 | 2.91 | 0.24 |
| 7d flexural strength | MPa | 1.29 | 3.45 | 0.98 |
| Cured volume shrinkage ratio | ％ | -0.04 | 15 | 3 |
As is clear from a comparison of Table 4 with tables 1 to 3, the strength of the grouting material is greatly reduced without using the fluidized bed combustion ash; the grouting material has serious plastic shrinkage without using an expanding agent, the volume shrinkage is large after the grouting material is cured, and the expanding agent and the volcanic ash activity of the sulfur-fixing ash slag play a synergistic effect, so that the grouting material has excellent antibody volume shrinkage capability; meanwhile, the strength of the grouting material is greatly reduced without using water glass, slaked lime and caustic soda, and the strength of the grouting material can be effectively improved through the alkali excitation effect of the water glass, the slaked lime and the caustic soda.
It should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the examples given, those skilled in the art can modify the technical solution of the present invention as needed or equivalent substitutions without departing from the spirit and scope of the technical solution of the present invention.
Claims (9)
1. An environment-friendly type solid sulfur ash-fly ash compound void grouting material is characterized in that:
the method comprises the following steps of: 30-80 parts of sulfur fixation ash, 20-40 parts of fly ash, 20-60 parts of curing agent, 1-4 parts of early strength agent, 2-6 parts of water reducing agent, 1-4 parts of defoaming agent, 0.01-0.03 part of expanding agent and 25-60 parts of water;
the curing agent consists of water glass, slaked lime, caustic soda, ordinary portland cement and plaster of paris; water glass in weight ratio: slaking lime: caustic soda: ordinary portland cement: 10-40% of calcined gypsum: 0-30: 5-25: 20-60: 30 to 50.
2. The environment-friendly type solid sulfur ash-fly ash compound de-air grouting material as claimed in claim 1, which is characterized in that: the sulfur fixation ash slag comprises sulfur fixation ash and sulfur fixation slag, wherein the specific surface area range of the sulfur fixation ash is more than 400m after the sulfur fixation ash is screened2Per kg; after the sulfur-fixing slag is subjected to primary crushing, grinding and screening, the surface area is 260-480 m2/kg；
After the fly ash is subjected to screening treatment, the specific surface area range is more than 400m2/kg。
3. The environment-friendly type solid sulfur ash-fly ash compound de-air grouting material as claimed in claim 1, which is characterized in that: the early strength agent is one or a mixture of calcium chloride, sodium chloride, aluminum chloride and lithium chloride.
4. The environment-friendly type solid sulfur ash-fly ash compound de-air grouting material as claimed in claim 1, which is characterized in that: the water reducing agent is one or a mixture of more of lignosulfonate, naphthalene sulfonate formaldehyde polymer, polycyclic aromatic salt or polycarboxylic acid.
5. The environment-friendly type solid sulfur ash-fly ash compound de-air grouting material as claimed in claim 1, which is characterized in that: the defoaming agent comprises one or more of mineral oil, polyether, organic silicon or fatty alcohol.
6. The environment-friendly type solid sulfur ash-fly ash compound de-air grouting material as claimed in claim 1, which is characterized in that: the swelling agent comprises one or more of calcium sulphoaluminates, calcium oxide-calcium sulphoaluminates and calcium oxide.
7. The preparation method of the fluidized bed combustion ash-fly ash compound environment-friendly type de-air grouting material of any one of claims 1 to 6, which is characterized in that: the method comprises the following steps:
(1) weighing the sulfur fixation ash slag and the fly ash according to the amount, wherein the sulfur fixation ash and the fly ash are screened; crushing, grinding and screening the solid sulfur slag; heating the sieved solid sulfur ash, the pulverized fuel ash and the crushed solid sulfur slag for oxygen-free high-temperature activation; then cooling to room temperature, and mixing uniformly to obtain a component A;
(2) weighing the early strength agent, the water reducing agent, the defoaming agent, the expanding agent and water according to the amount, and mechanically stirring uniformly to prepare an auxiliary agent component B;
(3) weighing water glass, slaked lime, caustic soda, ordinary portland cement and plaster of paris according to the amount, and uniformly stirring to prepare a curing agent component C;
(4) during the construction process, the component A, the component B and the component C are mixed according to the proportion
Uniformly mixing and stirring the components in a weight ratio of 1:0: 08-0.25: 0.4-0.6, and injecting the mixture into a void to be repaired in a grouting manner;
the steps (1), (2) and (3) are not divided in sequence.
8. The preparation method of the fluidized bed combustion ash-fly ash compound environment-friendly type void grouting material as claimed in claim 7, which is characterized in that: in the step (1), the step (c),
sieving the sulfur fixation ash and the fly ash by 1-3 mm, wherein the specific surface area of the sulfur fixation ash and the fly ash is more than 400m2/kg；
The specific method for crushing, grinding and screening the sulfur-fixing slag comprises the following steps: primarily crushing the sulfur-fixing slag, grinding for 20-40 minutes, screening, and taking out the specific surface area of 260-480 m2Per kg of solid sulphur slag powder;
the oxygen-free high-temperature activation specific conditions are as follows: heating for 3-5 h at 500-600 ℃.
9. The application of the fluidized bed combustion ash residue-fly ash compound environment-friendly type emptying grouting material of any one of claims 1 to 6 in the emptying treatment of a road bridge head butt strap.
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| CN102515673A (en) * | 2011-12-15 | 2012-06-27 | 西南科技大学 | Circulating fluidized bed boiler ash cement-based self-leveling material |
| CN102649634B (en) * | 2012-05-18 | 2014-06-04 | 西南科技大学 | Grouting material containing circulating fluidized bed fuel coal solid sulfur ash |
| CN104326722B (en) * | 2014-10-10 | 2016-06-08 | 厦门市建筑科学研究院集团股份有限公司 | A kind of solid sulfur ash fire extinguishing injecting paste material and preparation method thereof |
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