CN110510969B - Environment-friendly curing agent based on industrial waste and preparation method thereof - Google Patents
Environment-friendly curing agent based on industrial waste and preparation method thereof Download PDFInfo
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- CN110510969B CN110510969B CN201910801846.8A CN201910801846A CN110510969B CN 110510969 B CN110510969 B CN 110510969B CN 201910801846 A CN201910801846 A CN 201910801846A CN 110510969 B CN110510969 B CN 110510969B
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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
- C04B28/144—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 the synthetic calcium sulfate being a flue gas desulfurization product
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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
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field related to curing materials, and discloses an environment-friendly curing agent based on industrial waste and a preparation method thereof, wherein the curing agent comprises blast furnace slag, carbide slag and desulfurized gypsum, and the dry mass of the carbide slag is 5-40% of that of the blast furnace slag; the dry mass of the desulfurized gypsum is 2-40% of the dry mass of the carbide slag. The environment-friendly curing agent provided by the invention is prepared by taking industrial waste as a raw material, can realize resource utilization of the industrial waste, simultaneously eliminates adverse effects of the industrial waste on the environment, solves the problems of high energy consumption and high emission caused by using the traditional curing agent, saves the construction cost, simultaneously improves the curing effect and reduces the cost; in addition, the curing agent can meet the curing requirement only by a small amount of components and addition amount, and the problem of poor later-stage curing effect caused by excessive components and large impurity content can be avoided.
Description
Technical Field
The invention belongs to the technical field of curing materials, and particularly relates to an environment-friendly curing agent based on industrial waste and a preparation method thereof.
Background
During construction of soft soil foundation, the soft soil has many engineering characteristics such as large void ratio, strong compressibility, poor permeability, extremely low bearing capacity, poor stability and the like, so that a lot of inconvenience is often brought to engineering construction. For the construction of soft soil foundations, a curing method is often used to quickly improve the strength of the soft soil so as to improve the bearing capacity of the soft soil. The curing method is characterized in that a curing agent is doped into the soft soil, the curing agent generates hydration reaction or volcanic ash reaction in the soil body to quickly reduce the content of free water in the soft soil, and the generated crystalline minerals fill the gaps in the soil body to form a soil body framework, so that the effect of improving the strength of the soil body is achieved. In practical engineering, the most common curing agent is stoneAsh, cement, etc. However, the addition amount of lime as a curing agent needs to be strictly controlled, and the soil body is cracked and the like due to the excessively high addition amount. The cement is used as a curing agent, and although the effect is good, a large amount of cement needs to be added. However, about 100 degrees of electricity are required per ton of cement produced, releasing about 500 kg more of CO2The use of large amounts of such high energy and high emission materials will have a detrimental effect on the environment.
China is a big coal-fired country, the coal-fired quantity of a thermal power plant occupies an important position, and a large amount of SO is generated in the coal combustion process2And SO2Is an important cause of acid rain. The flue gas desulfurization is the most widely and effectively used SO at present2And (4) control technology. Desulfurized gypsum is an industrial waste produced by the desulfurization process. Statistically, more than 100 tons of desulfurized gypsum are produced annually in China, and the huge and striking industrial waste products not only occupy a large amount of land resources but also cause secondary pollution if being piled and buried as a treatment way. Also facing the disposal and comprehensive utilization problems are blast furnace slag, carbide slag and the like. How to realize the resource utilization of the industrial waste is a problem which needs to be solved urgently at present.
In addition, the existing curing agent adopts phosphogypsum which is solid waste residue generated when phosphorite is treated by sulfuric acid in the production of phosphoric acid, wherein the main component is calcium sulfate, and the phosphogypsum contains a large amount of mineral impurities of Ca and Mg. The existing research results show that the cement matrix curing agent mainly fills the pores of the soil body by a large amount of crystalline minerals such as CAH, CSH, ettringite and the like generated by hydration reaction and volcanic ash reaction, thereby achieving the purpose of enhancing the strength of the soil body; however, in the later stage of solidification, if more crystalline minerals are generated, especially the volume expansion rate of ettringite is very large, if a large amount of ettringite is generated in the later stage of solidification, the soil with dense pores has a large negative effect, and the ettringite can open the micropores in the soil (from a macroscopic view, cracks are generated in the soil), so that the strength of the soil is weakened. Therefore, the calcium-containing substance in the curing agent should not be too much or too little, and too little will result in poor curing effect, and too much will affect the strength at the later stage of curing. Accordingly, there is a need in the art to develop an environment-friendly curing agent based on industrial waste with better performance and a preparation method thereof.
Disclosure of Invention
Aiming at the defects or improvement requirements in the prior art, the invention provides an industrial waste-based environment-friendly curing agent and a preparation method thereof. The curing agent is prepared by taking industrial waste as a raw material, can realize resource utilization of the industrial waste, simultaneously eliminates adverse effects of the industrial waste on the environment, solves the problems of high energy consumption and high emission caused by using the traditional curing agent, saves the construction cost, simultaneously improves the curing effect and has lower cost. In addition, the curing agent can meet the curing requirement only by a small amount of components and addition amount, and the problem of poor later-stage curing effect caused by excessive components and large impurity content is avoided.
In order to achieve the aim, the invention provides an environment-friendly curing agent based on industrial waste, which comprises the components of blast furnace slag, carbide slag and desulfurized gypsum, wherein the dry mass of the carbide slag is 5-40% of that of the blast furnace slag; the dry mass of the desulfurized gypsum is 2-40% of the dry mass of the carbide slag.
Further, the ratio of the dry mass of the carbide slag to the dry mass of the blast furnace slag is any of 10%, 15%, 20%, 25%, 30%, 35%, and 40%.
Further, the ratio of the dry mass of the desulfurized gypsum to the dry mass of the carbide slag is any of 2%, 10%, 15%, 20%, 25%, 30%, 35%, and 40%.
Further, the curing agent is used for curing soft soil; when in use, the mass of the curing agent is 5-30% of the mass of the dry soft soil.
Further, the ratio of the mass of the curing agent to the mass of the dry soft soil is any of 5%, 10%, 15%, 20%, 25% and 30%.
Further, the soft soil is kaolin, the liquid limit of the kaolin is 42%, and the water content is 40%.
The invention also provides a preparation method of the industrial waste-based environment-friendly curing agent, which comprises the following steps:
(1) weighing blast furnace slag, carbide slag and desulfurized gypsum; wherein the dry mass of the carbide slag is 5-40% of that of the blast furnace slag; the dry mass of the desulfurized gypsum is 2-40% of the dry mass of the carbide slag;
(2) and (2) uniformly mixing the raw materials weighed in the step (1) to obtain the environment-friendly curing agent.
Generally, compared with the prior art, the technical scheme of the invention has the following advantages that:
1. the components of the curing agent comprise blast furnace slag, carbide slag and desulfurized gypsum, the three components are industrial waste, the resource utilization of the industrial waste is realized, the components are fewer, the impurities are easy to control, the poor later-stage curing effect caused by too many components and large impurity content is avoided, the environment is protected, and the applicability is strong.
2. The dry mass of the carbide slag is 5-40% of that of the blast furnace slag; the dry mass of the desulfurized gypsum is 2-40% of the dry mass of the carbide slag, the mass ratio of the components is reasonably controlled, so that the content of calcium-containing substances in the prepared curing agent is suitable, excessive and insufficient contents can be avoided, the soil body is prevented from cracking when the curing agent is used for curing the soil body, and the strength of the soil body is ensured.
3. The components of the curing agent are all industrial wastes, the manufacturing cost is low, the problem of eliminating adverse effects of the industrial wastes on the environment is solved, the applicability is high, and compared with the traditional curing agent, the curing agent saves the engineering cost by more than 50% under the condition of achieving the same curing effect.
4. Because the curing agent is based on industrial waste and does not need further processing treatment, compared with a cement curing material, the energy consumption and the greenhouse gas emission are obviously reduced, and the curing agent is environment-friendly.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing an industrial waste-based environmentally-friendly curing agent according to the present invention;
FIG. 2 is a schematic view of unconfined compressive strength of a 7-day solidified soil sample of the environment-friendly industrial waste-based solidifying agent provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, the components of the environment-friendly curing agent based on industrial waste provided by the invention comprise blast furnace slag powder, carbide slag and desulfurized gypsum, wherein the dry mass of the carbide slag is 5% -40% of the dry mass of the blast furnace slag, preferably, any value or any range of two values of 5%, 10%, 15%, 20%, 25%, 30%, 35% and 40%; the dry mass of the desulfurized gypsum is 2-40% of the dry mass of the carbide slag, preferably any value or any two values of 2%, 10%, 15%, 20%, 25%, 30%, 35% and 40%.
Wherein, the components of the desulfurized gypsum are more single than those of phosphogypsum and are easy to control. The calcium-containing substance in the curing agent is not too much or too little, too little can result in poor curing effect, and too much can influence the strength of the later curing period. In the embodiment, the curing agent is used for curing soft soil, and when the curing agent is used, the mass of the curing agent is 5-30% of that of dry soft soil.
The invention also provides a preparation method of the environment-friendly curing agent for industrial waste, which comprises the following steps:
(1) weighing blast furnace slag powder, carbide slag and desulfurized gypsum according to a predetermined mass ratio.
(2) And (2) uniformly mixing the raw materials weighed in the step (1) to obtain the environment-friendly curing agent.
In order to further illustrate the environment-friendly curing agent provided by the invention, in the embodiment, two different curing agents, namely the curing agent and ordinary portland cement, are used for carrying out curing test analysis on kaolin, wherein the liquid limit of the kaolin used in the test is 42%, the water content is 40%, the mixing amount of the curing agent is 10% of the dry mass of the kaolin, the carbide slag accounts for 20% of the dry mass of the blast furnace slag powder, and the desulfurized gypsum accounts for 0%, 2%, 5%, 10%, 20% and 40% of the dry mass of the carbide slag.
Firstly, the curing agent and kaolin are fully and uniformly stirred, then the mixture is injected into a cylindrical die with the height of 10cm and the diameter of 5cm, tamping and compacting are carried out, and then a sample is placed in a constant temperature and humidity box with the temperature of 20 ℃ and the relative humidity of more than or equal to 95% for curing. The unconfined compressive strength of each sample when the curing time was 7 days is shown in FIG. 2.
As can be seen from FIG. 2, the addition of desulfurized gypsum can significantly improve the curing effect of the curing agent, and the curing effect is increased with the increase of the amount of desulfurized gypsum. The unconfined compressive strength of the sample cured by the cement is about 2300kPa at 7 days, and the curing effect of the curing agent is obviously better than that of a cement group. In the case of the optimal proportion (the mixing amount of the desulfurized gypsum is 40 percent of the dry mass of the carbide slag) in the test, the unconfined compressive strength of the sample using the curing agent is about 2 times that of a cement group.
According to the environment-friendly curing agent based on industrial waste and the preparation method thereof, the curing effect can be remarkably improved, and the resource utilization of the industrial waste is realized. Compared with the traditional curing agent, the curing agent saves more than 50% of engineering cost under the condition of achieving the same curing effect. Since the curing agent is based on industrial waste and does not need to undergo further processing, energy consumption and greenhouse gas emissions are significantly reduced compared to cement curing materials.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. An environment-friendly curing agent based on industrial waste is characterized in that:
the environment-friendly curing agent comprises blast furnace slag, carbide slag and desulfurized gypsum, wherein the ratio of the dry mass of the carbide slag to the dry mass of the blast furnace slag is more than or equal to 5% and less than 10% or more than 30% and less than or equal to 40%; the dry mass of the desulfurized gypsum is 2-40% of the dry mass of the carbide slag.
2. The industrial waste-based environmentally friendly curing agent according to claim 1, wherein: the ratio of the dry mass of the desulfurized gypsum to the dry mass of the carbide slag is any of 2%, 10%, 15%, 20%, 25%, 30%, 35% and 40%.
3. The industrial waste-based environmentally friendly curing agent according to claim 1, wherein: the curing agent is used for curing soft soil; when in use, the mass of the curing agent is 5-30% of the mass of the dry soft soil.
4. The industrial waste-based environmentally friendly curing agent according to claim 3, wherein: the ratio of the mass of the curing agent to the mass of the dry soft soil is any value of 5%, 10%, 15%, 20%, 25% and 30%.
5. The industrial waste-based environmentally friendly curing agent according to claim 3, wherein: the soft soil is kaolin, the liquid limit of the kaolin is 42%, and the water content is 40%.
6. A method for preparing the industrial waste-based environmentally friendly curing agent according to any one of claims 1 and 3 to 5, comprising the steps of:
(1) weighing blast furnace slag, carbide slag and desulfurized gypsum; wherein the ratio of the dry mass of the carbide slag to the dry mass of the blast furnace slag is 5% or more and less than 10% or 30% or more and 40% or less; the dry mass of the desulfurized gypsum is 2-40% of the dry mass of the carbide slag;
(2) and (2) uniformly mixing the raw materials weighed in the step (1) to obtain the environment-friendly curing agent.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1736937A (en) * | 2005-07-14 | 2006-02-22 | 何国荣 | Soft soil hardener preparing from high calcium ash, desulfuration gypsum and cement |
| CN103332910A (en) * | 2013-07-18 | 2013-10-02 | 东南大学 | Soft soil curing agent based on three industrial wastes |
| KR20140144625A (en) * | 2013-06-11 | 2014-12-19 | 주식회사 씨엠디기술단 | Solidified agent for deep cement mixing method |
| CN105236908A (en) * | 2015-10-22 | 2016-01-13 | 浙江大学宁波理工学院 | Soft soil curing agent prepared by means of industrial residues |
| KR20170114125A (en) * | 2016-04-04 | 2017-10-13 | (주)대우건설 | A composition of soil solidifier and construction method using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102557494A (en) * | 2011-12-20 | 2012-07-11 | 东南大学 | Industrial-waste-based environment-friendly curing agent |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1736937A (en) * | 2005-07-14 | 2006-02-22 | 何国荣 | Soft soil hardener preparing from high calcium ash, desulfuration gypsum and cement |
| KR20140144625A (en) * | 2013-06-11 | 2014-12-19 | 주식회사 씨엠디기술단 | Solidified agent for deep cement mixing method |
| CN103332910A (en) * | 2013-07-18 | 2013-10-02 | 东南大学 | Soft soil curing agent based on three industrial wastes |
| CN105236908A (en) * | 2015-10-22 | 2016-01-13 | 浙江大学宁波理工学院 | Soft soil curing agent prepared by means of industrial residues |
| KR20170114125A (en) * | 2016-04-04 | 2017-10-13 | (주)대우건설 | A composition of soil solidifier and construction method using the same |
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