CN114656237A - Titanium gypsum-based roadbed filler and preparation method and application thereof - Google Patents
Titanium gypsum-based roadbed filler and preparation method and application thereof Download PDFInfo
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- CN114656237A CN114656237A CN202210242474.1A CN202210242474A CN114656237A CN 114656237 A CN114656237 A CN 114656237A CN 202210242474 A CN202210242474 A CN 202210242474A CN 114656237 A CN114656237 A CN 114656237A
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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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- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
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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
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Organic Chemistry (AREA)
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Abstract
The invention provides a titanium gypsum-based roadbed filler and a preparation method and application thereof, and relates to the technical field of road engineering materials. The roadbed filler consists of two parts, namely a component A and a component B, wherein the component A is pretreated titanium gypsum, and the component B is a modifier; the modifier comprises blast furnace slag or sintering red mud, carbide slag, fly ash, white mud or solid sulfur ash, nano materials, ordinary portland cement, a binder, a surfactant and an excitant; wherein, the component A accounts for 100 parts, and the component B accounts for 0 to 20 percent of the component A. The invention uses various solid waste materials to mix and modify titanium gypsum, treats waste with waste, compounds the surfactant, the nano material and the cement, improves the strength and the water stability of the novel titanium gypsum roadbed filler through gradation adjustment, pore filling and powder surface modification, relieves the problem of lacking roadbed filler, effectively protects the environment and has good practical application value.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a titanium gypsum-based roadbed filler 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 roadbed is the support of the pavement structure, and the good long-term performance of the roadbed is an important guarantee of the long-life pavement structure. With the popularization of the green concept and the increasing shortage of land resources, the shortage of roadbed filling becomes a prominent problem restricting the development of road engineering. The titanium gypsum is industrial waste residue which is produced by adding lime (or carbide slag) to neutralize a large amount of acid waste water and takes dihydrate gypsum as a main component for treating the acid waste water when the titanium dioxide is produced by adopting a sulfuric acid method, and 6-10 tons of titanium gypsum can be produced by half producing 1 ton of titanium dioxide by adopting the sulfuric acid method. According to statistics, the annual emission amount of titanium gypsum in China is nearly 3000 ten thousand tons. Because calcium sulfate particles in the titanium gypsum are fine, the free water content is high and the like, the titanium gypsum can not be recycled on a large scale, and if the titanium gypsum is improved to be used as a roadbed filler, the shortage of the roadbed filler can be effectively relieved under the condition of realizing the reutilization of the titanium gypsum resource.
At present, aiming at the requirement of roadbed fillers, the problems of limiting the utilization of titanium gypsum are high water content, lower mechanical strength and poorer water stability. The reasons are three points, firstly, the titanium gypsum has high solubility, and when the titanium gypsum is soaked in water, the bonding force among crystals is weakened due to the dissolution of the gypsum, so that the strength is reduced; secondly, because titanium gypsum contains a large number of micro cracks, when the titanium gypsum is soaked in water, the inner surface absorbs moisture, and a water film generates wedging action, so that the gypsum has strong water adsorption capacity; finally, the moisture absorption effect is aggravated because the gypsum has high porosity; the combined action of the three factors causes the titanium gypsum to have high water content, low mechanical strength and poor water stability, and the utilization is difficult.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a titanium gypsum-based roadbed filler as well as a preparation method and application thereof. The titanium gypsum is pretreated and then treated by the modifier, so that the water stability and the mechanical property of the titanium gypsum are improved, and the water absorption of the titanium gypsum is reduced, so that the titanium gypsum is suitable for being used as roadbed filling materials and the like, and has good practical application value.
In order to achieve the above object, the technical solution of the present invention is as follows:
in a first aspect of the invention, a titanium gypsum-based roadbed filler is provided, wherein the roadbed filler consists of two parts, namely a component A and a component B, the component A is pretreated titanium gypsum, and the component B is a modifier;
the modifier comprises blast furnace slag or sintering red mud, carbide slag, fly ash, white mud or solid sulfur ash, nano materials, ordinary portland cement, a binder, a surfactant and an excitant.
Wherein, the component A accounts for 100 parts, and the component B accounts for 0 to 20 percent (w/w) of the component A.
More specifically, the titanium gypsum pretreatment method comprises the following steps: drying titanium gypsum and then crushing.
Specifically, drying can be carried out in a drying mode, and titanium gypsum is subjected to thermal activation, wherein the specific temperature is selected to be 20-150 ℃, and the crushed particle size range is 2-5 cm.
The modifier of the component B is prepared from the following components: 25-45 parts of blast furnace slag or sintering process red mud; 25-55 parts of carbide slag; 0-15 parts of fly ash, white mud or solid sulfur ash; 0-10 parts of nano material and 25-60 parts of ordinary portland cement; 1-15 parts of a binder; 1-10 parts of surfactant; the exciting agent accounts for one ten thousandth to eight ten thousandth of the total weight of the modifying agent.
In a second aspect of the present invention, there is provided a method for preparing the roadbed filler, wherein the method comprises:
(1) drying and crushing the component A;
(2) in the component B, blast furnace slag or red mud, fly ash, white mud or solid sulfur ash slag and carbide slag are dried and ground, and are respectively sieved; then weighing blast furnace slag or red mud, carbide slag, fly ash, white mud or solid sulfur ash slag and nano materials according to the mass proportion, carrying out dry mixing, and adding a binder, an excitant and a surfactant into water to prepare an FH aqueous solution;
in another embodiment of the invention, component a and component B are dry-mixed and then mixed with water, specifically according to the test protocol for inorganic binder-stabilized materials for road engineering (JTGE 51-2009).
In a third aspect of the present invention, there is provided a use of the roadbed filling of the first aspect in the field of road engineering.
One or more of the technical schemes have the following beneficial effects:
aiming at the characteristics of high water absorption, low strength and poor water stability of the titanium gypsum, the roadbed filler based on the titanium gypsum adopts the concept of treating waste by waste, utilizes the multi-source solid waste mixing of red mud, blast furnace slag and the like, and utilizes the gelation effect of the solid waste and the excessive pore filling and grading adjustment effect on the particle size to improve the mechanical strength performance of the titanium gypsum.
In addition, aiming at the problem of poor water stability of the titanium gypsum, the technical scheme adopts a plurality of solid wastes to cooperate as aluminosilicate precursors, utilizes calcium sulfate contained in the titanium gypsum to carry out sulfate excitation to generate ettringite, fills pores in the titanium gypsum and reduces the contact surface area of water, and in addition, a surface active agent is utilized to cover the surface of titanium gypsum powder on the surface of ions through physical, chemical adsorption or chemical reaction, so that the treated titanium gypsum is hydrophobic, and the water absorption of the titanium gypsum is reduced. The addition of the nano material plays a role in excitation, can increase the production of hydrated calcium silicate gel and ettringite, and can better prevent water from infiltrating due to the coordination of multi-scale particle size, so that a waterproof layer is formed on the surface of the titanium gypsum, thereby improving the water stability of the titanium gypsum.
According to the novel roadbed filler based on titanium gypsum and the modifying agent thereof, provided by the technical scheme, titanium gypsum, blast furnace slag or red mud, fly ash, white mud or solid sulfur ash slag and other bulk industrial solid wastes are adopted, so that the problem of reduction and utilization of the bulk solid wastes is effectively solved, the cost of a solidified soil body is reduced, and compared with 5% cement, the cost is reduced by about 1-20%. Meanwhile, the utilization of bulk solid waste resources effectively protects the environment, thereby having good practical application value.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application 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 example embodiments according to the present application. 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.
As mentioned above, the difficulties of limiting the utilization of titanium gypsum in terms of the requirements of roadbed filler are high water content, low mechanical strength and poor water stability.
In view of the above, in an exemplary embodiment of the present invention, there is provided a titanium gypsum-based roadbed filler, which is composed of two parts, i.e., a component a and a component B, wherein the component a is pretreated titanium gypsum, and the component B is a modifier;
the modifier comprises blast furnace slag or sintering red mud, carbide slag, fly ash, white mud or solid sulfur ash, nano materials, ordinary portland cement, a binder, a surfactant and an excitant.
Wherein, the component A accounts for 100 parts, and the component B accounts for 0 to 20 percent (w/w) of the component A.
More specifically, the titanium gypsum pretreatment method comprises the following steps: drying titanium gypsum and then crushing.
Specifically, drying can be carried out in a drying mode, and titanium gypsum is subjected to thermal activation, wherein the specific temperature is selected to be 20-150 ℃, and the crushed particle size range is 2-5 cm.
The modifier of the component B is prepared from the following components: 25-45 parts of blast furnace slag or sintering process red mud; 25-55 parts of carbide slag; 0-15 parts of fly ash, white mud or solid sulfur ash; 0-10 parts of nano material and 25-60 parts of ordinary portland cement; 1-15 parts of a binder; 1-10 parts of surfactant; the excitant accounts for one ten thousandth to eight ten thousandth of the total weight of the modifier.
In another embodiment of the present invention, the nano material is any one or more of nano silica, nano magnesia and nano alumina.
In another embodiment of the present invention, the portland cement is any one of P.O 42.5.5, P.O 52.5.5 and P.O 62.5.5; preferably P.O 42.5.5.
In another embodiment of the present invention, the binder is any one or more of water glass and polyacrylamide.
In another embodiment of the present invention, the surfactant is any one or more of fatty glyceride, sodium stearyl sulfate, sodium dodecylbenzenesulfonate and calcium lignosulfonate.
In another embodiment of the present invention, the activator is any one or more of diethanol monoisopropanolamine, triisopropanolamine, sodium tripolyphosphate and triethanolamine.
Wherein, the exciting agent, the surfactant and the binder are added into water to prepare a mixed water solution which is called FH solution;
according to the invention, the titanium gypsum is compounded by the nano material, the chemical activator, the binder, the waterproof agent, the solid waste material and the cement to improve the overall strength, the early strength and the later strength are considered, and the water stability is improved; meanwhile, the solid waste dosage is large, and the doping amount of nano materials, chemical excitants and the like is small, so that the performance requirement is met, and the material cost is greatly reduced.
In another embodiment of the present invention, there is provided a method for preparing the roadbed filler, wherein the method comprises:
(1) drying and crushing the component A;
(2) in the component B, blast furnace slag or red mud, fly ash, white mud or solid sulfur ash slag and carbide slag are dried and ground, and are respectively sieved; then weighing blast furnace slag or red mud, carbide slag, fly ash, white mud or solid sulfur ash slag and nano materials according to the mass proportion, carrying out dry mixing, and adding a binder, an excitant and a surfactant into water to prepare an FH aqueous solution;
wherein, in the step (1),
the specific conditions for drying, heat activating and crushing the component A comprise: the drying condition is 20-150 ℃, and the crushing grain size range is controlled to be 2-5 cm;
in the step (2), the specific conditions for drying and grinding the blast furnace slag or red mud, fly ash, white mud or solid sulfur ash and carbide slag are as follows: drying (baking) at 60-105 deg.C, and grinding to obtain powder with particle size of 0.075-2 mm.
In another embodiment of the invention, the component a and the component B are dry-mixed, mixed with water, and compacted to obtain the road inorganic binder stabilizing material, which can be specifically operated according to the test protocol for road engineering inorganic binder stabilizing materials (JTGE 51-2009).
In another embodiment of the present invention, the roadbed filler is applied in the field of road engineering.
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 novel titanium gypsum-based roadbed filler comprises the following raw materials in parts by mass:
100 parts of component A, 5% of component B, 30 parts of blast furnace slag, 12 parts of fly ash and 50 parts of cement; 3 parts of binder, namely water glass, 5 parts of surfactant and 5 parts of fatty glyceride, wherein the chemical excitant accounts for four ten-thousandth of the mass of the dry materials and is diethanol monoisopropanolamine.
The component A is pretreated titanium gypsum, and the specific method comprises the following steps: drying titanium gypsum and then crushing. Specifically, the drying is carried out in a drying mode, the drying temperature is selected to be 100 ℃, and the crushing particle size range is 2-5 cm.
Example 2
The novel titanium gypsum-based roadbed filler comprises the following raw materials in parts by mass:
100 parts of component A, 10% of component B, 45 parts of red mud, 10 parts of white mud and 30 parts of cement; 2 parts of nano material, namely nano silicon dioxide, 5 parts of binder, namely polyacrylamide, eight ten-thousandth of the mass of a chemical exciting agent, namely sodium tripolyphosphate, 8 parts of surfactant and calcium lignosulfonate.
Wherein the component A is titanium gypsum, and the preparation method is the same as that of the embodiment 1.
Example 3
The novel titanium gypsum-based roadbed filler comprises the following raw materials in parts by mass:
100 parts of component A, 20% of component B, 45 parts of red mud, 13 parts of solid sulfur ash and 25 parts of cement; 7 parts of binder, namely water glass, 10 parts of surfactant and 10 parts of calcium lignosulphonate, wherein the chemical activator accounts for three ten-thousandth of the mass of the dry materials and is triethanolamine.
Wherein the component A is titanium gypsum, and the preparation method is the same as that of the embodiment 1.
Comparative example 1
A titanium gypsum-based novel roadbed filler comparative example comprises the following raw materials in percentage by mass:
100 parts of the component A, and 5 percent of cement.
Wherein the component A is titanium gypsum, and the preparation method is the same as that of the embodiment 1.
Comparative example 2
A titanium gypsum-based novel roadbed filler comparative example comprises the following raw materials in percentage by mass:
100 parts of component A, 20% of component B, 45 parts of red mud, 13 parts of solid sulfur ash and 25 parts of cement; 7 parts of a binder, namely water glass.
Wherein the component A is titanium gypsum, and the preparation method is the same as that of the embodiment 1.
Comparative example 3
The novel titanium gypsum-based roadbed filler comprises the following raw materials in parts by mass:
100 parts of component A, 20% of component B, 60 parts of red mud, 8 parts of solid sulfur ash and 12 parts of cement; 20 parts of binder which is water glass, chemical excitant which accounts for three percent of the mass of the dry material and is triethanolamine.
Wherein the component A is titanium gypsum, and the preparation method is the same as that of the embodiment 1.
The performance of the roadbed filling materials obtained in the embodiments 1 to 3 is detected, and the specific detection method comprises the following steps:
determination of unconfined compressive strength:
the roadbed fillers of the embodiment 1 to the comparative example 3 are prepared into cylindrical samples with the diameter of 50mm multiplied by 50mm by referring to the test specification of inorganic binder stabilizing materials for highway engineering (JTGE51-2009), the samples are kept for 6d and the 7d unconfined compressive strength after being soaked in water for 1d under the conditions that the temperature is 20 ℃ plus or minus 2 ℃ and the relative humidity is more than 95%, the water stability coefficient is measured according to the specification of soil curing admixture CJ/T486, and the value of the unconfined compressive strength of the 7d after being kept for 6d and soaked in water for 1d is the ratio of the unconfined compressive strength when being kept for 7d under the conditions that the temperature is 20 ℃ plus or minus 2 ℃ and the relative humidity is more than 95%. The results are shown in table 1:
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 (10)
1. The titanium gypsum-based roadbed filler is characterized by comprising a component A and a component B, wherein the component A is pretreated titanium gypsum, and the component B is a modifier;
the modifier comprises blast furnace slag or sintering red mud, carbide slag, fly ash, white mud or solid sulfur ash, nano materials, ordinary portland cement, a binder, a surfactant and an excitant;
wherein, the component A accounts for 100 parts, and the component B accounts for 0 to 20 percent of the component A.
2. The subgrade filler of claim 1, wherein the titanium gypsum pretreatment process comprises: drying, crushing and activating the titanium gypsum;
preferably, the drying can be carried out in a drying mode, and the titanium gypsum is subjected to thermal activation, wherein the specific temperature is selected to be 20-150 ℃, and the crushed particle size range is 2-5 cm.
3. The road-base filler according to claim 1, wherein the modifier of component B is made from: 25-45 parts of blast furnace slag or sintering red mud; 25-55 parts of carbide slag; 0-15 parts of fly ash, white mud or solid sulfur ash; 0-10 parts of nano material and 25-60 parts of ordinary portland cement; 1-15 parts of a binder; 1-10 parts of surfactant; the exciting agent accounts for one ten thousandth to eight ten thousandth of the total weight of the modifying agent.
4. The roadbed filler of claim 3, wherein the nano material is any one or more of nano silica, nano magnesia and nano alumina;
the type of the ordinary portland cement is any one of P.O 42.5.5, P.O 52.5.5 and P.O 62.5.5; preferably P.O 42.5.5;
the binder is any one or more of water glass and polyacrylamide.
5. The road base filler according to claim 3, wherein the surfactant is any one or more of fatty acid glyceride, sodium stearyl sulfate, sodium dodecylbenzenesulfonate and calcium lignosulfonate;
the excitant is any one or more of diethanol monoisopropanolamine, triisopropanolamine, sodium tripolyphosphate and triethanolamine.
6. A method for preparing the roadbed filler as claimed in any one of claims 1 to 5, wherein the method comprises:
(1) drying and crushing the component A;
(2) in the component B, blast furnace slag or red mud, fly ash, white mud or solid sulfur ash and carbide slag are dried, ground and respectively screened; then weighing blast furnace slag or red mud, carbide slag, fly ash, white mud or solid sulfur ash slag and nano materials according to the mass proportion, dry-mixing, and adding a binder, an exciting agent and a surfactant into water to prepare an FH aqueous solution.
7. The method according to claim 6, wherein in the step (1),
the specific conditions for drying and crushing the component A comprise: the drying condition is 20-150 deg.C, and the crushed particle size range is controlled to be 2-5 cm.
8. The preparation method according to claim 6, wherein in the step (2), the specific conditions for drying and grinding the blast furnace slag or red mud, fly ash, white mud or solid sulfur ash and carbide slag are as follows: drying at 60-105 deg.C, and grinding to obtain fine powder with particle size of 0.075-2 mm.
9. The method of claim 6, wherein the component A and the component B are dry-mixed, mixed with water, and compacted to obtain the final product; preferably, the method is carried out according to the test protocol for inorganic binder stabilizing materials for road engineering (JTGE 51-2009).
10. Use of the roadbed filling of any one of claims 1 to 4 in the field of road engineering.
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| CN115286344A (en) * | 2022-08-18 | 2022-11-04 | 重庆大学 | Method for preparing curing agent by using phosphogypsum and application thereof |
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