CN112608755A - Composite shrinkage reducing agent suitable for high-flow collapsible loess and application thereof - Google Patents
Composite shrinkage reducing agent suitable for high-flow collapsible loess and application thereof Download PDFInfo
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- CN112608755A CN112608755A CN202011424586.6A CN202011424586A CN112608755A CN 112608755 A CN112608755 A CN 112608755A CN 202011424586 A CN202011424586 A CN 202011424586A CN 112608755 A CN112608755 A CN 112608755A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/04—Anhydrides, e.g. cyclic anhydrides
- C08F222/06—Maleic anhydride
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/20—Vinyl polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
- C09K17/18—Prepolymers; Macromolecular compounds
- C09K17/32—Prepolymers; Macromolecular compounds of natural origin, e.g. cellulosic materials
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
Abstract
The invention relates to a composite shrinkage reducing agent suitable for large-flow collapsible loess and application thereof. The composite shrinkage reducing agent is prepared from the following raw materials in parts by weight: 55-60 parts of titanium powder, 15-20 parts of fiber, 5-10 parts of anionic surfactant and 100 parts of deionized water. The invention has obvious effect of improving self-weight collapsible loess soil, can improve the workability of loess, improves the fluidity and cohesiveness of the loess, ensures the backfill effect of the loess in a fertilizer tank, improves the backfill construction quality and improves the safety of buildings.
Description
Technical Field
The invention belongs to the technical field of loess modifiers, and particularly relates to a composite shrinkage reducing agent suitable for high-flow collapsible loess and application thereof.
Background
Although collapsible loess has realized the construction of big flow state when the foundation ditch is backfilled, nevertheless because it belongs to the shrinkability material itself, so take place the crack of shrinkability easily behind the construction of big flow state collapsible loess, the intensity of the soil body can greatly be reduced to the existence of this kind of fissured can greatly, especially rainwater can further reduce its intensity with the infiltration of corrosive medium, appear proruption subsides even, causes serious potential safety hazard to the engineering structure.
The collapsible loess foundation is treated to eliminate the collapse of loess and raise the bearing capacity of the foundation. The common foundation treatment methods comprise a soil or lime soil cushion layer, a soil pile or lime soil pile, a dynamic compaction method, a heavy hammer compaction method, a pile foundation, a pre-soaking method and the like, most of the foundation treatment methods are construction treatment, remedy after problems occur, prevention before the problems occur, and repair cost is high.
Disclosure of Invention
The invention provides application of an alkene titanium powder in improving the problems of loess collapsibility and workability in order to solve the technical problems in the background art.
Meanwhile, the invention also provides a composite shrinkage reducing agent which takes the alkene titanium powder as the main material and is suitable for the large-flow collapsible loess and the application thereof.
The technical solution of the invention is as follows: the invention provides a new application of an alkene titanium powder in improving the large fluid state collapsibility of loess.
A new use of titanium alkene powder in improving loess workability is provided.
A composite shrinkage reducing agent suitable for large-flow collapsible loess is characterized in that: the composite shrinkage reducing agent comprises, by weight, 50-70 parts of an alkene titanium powder, 15-20 parts of a fiber and 5-10 parts of an anionic surfactant.
Preferably, the composite shrinkage-reducing agent comprises the following raw materials in parts by weight: 55-60 parts of titanium powder, 15-20 parts of fiber, 5-10 parts of anionic surfactant and 100 parts of deionized water.
Preferably, the fibers are any one or more of asbestos cement, steel fibers, glass fibers, polypropylene fibers, carbon fiber soil, plant fibers or high elastic modulus synthetic fibers.
Preferably, the titanium ene powder is prepared by the following method:
adding 10-15 parts of deionized water into a reaction kettle, starting stirring, adding maleic anhydride, slowly heating to 70 ℃, and then respectively dropwise adding acrylic acid, allyl amine and ammonium persulfate solution, wherein the weight ratio of maleic anhydride: acrylic acid: the molar ratio of allyl amine is 17-20: 10: 1-5 parts by mass of ammonium persulfate, controlling the temperature to be 72-75 ℃, reacting for 2 hours, keeping the temperature for 1 hour, and finally cooling and discharging to obtain the titanium ene powder.
The preparation method of the composite shrinkage reducing agent suitable for the large fluid collapsible loess is characterized by comprising the following steps: the method comprises the following steps:
uniformly mixing the titanium powder, the anionic surfactant and the deionized water according to the proportion, stirring for 0.5h, adding the fiber, and stirring for 0.5-2.5 h to obtain the composite shrinkage-reducing agent suitable for the large-flow collapsible loess.
The application of the composite shrinkage-reducing agent suitable for the large fluid state collapsible loess in improving the large fluid state collapsible loess is provided.
The application of the composite shrinkage-reducing agent suitable for the large fluid collapsible loess in improving self-weight collapsibility of loess.
Compared with the prior art, the invention has the beneficial effects that:
1) the composite shrinkage reducing agent is prepared by compounding the main material of the titanium powder with the fiber and the anionic surfactant and adding water, can prevent in advance aiming at the problem of large-flow-state collapsibility of loess, reduces repairing components, breaks through the collapsibility problem of the traditional fertilizer tank backfilling of loess geology, and particularly has more obvious effect of improving self-weight collapsible loess soil.
2) The composite shrinkage reducing agent can also improve the workability of the loess, improve the fluidity and cohesiveness of the loess, ensure the backfilling effect of the loess in a fertilizer tank, improve the backfilling construction quality and improve the safety of buildings.
3) The alkene titanium powder provided by the invention takes maleic anhydride, acrylic acid, allyl amine and ammonium persulfate as main raw materials, the preparation cost is relatively low, the engineering cost can be greatly reduced, and the cost is saved.
4) The composite shrinkage reducing agent prepared by using the alkene titanium powder as the main material can effectively control the further development of the cracks of the solidified loess, thereby improving the crack resistance of the loess and enhancing the integral structure of the solidified loess.
Detailed Description
The invention provides a new application of an alkene titanium powder in improving the large fluid state collapsibility of loess.
The invention also provides a new application of the titanium ene powder in improving loess workability.
The invention relates to a composite shrinkage reducing agent suitable for large-flow collapsible loess, which comprises the following raw materials in parts by weight: 50-70 parts of titanium powder, 15-20 parts of fiber and 5-10 parts of anionic surfactant.
Further, the composite shrinkage reducing agent suitable for the large fluid collapsible loess of the invention comprises the following raw materials in parts by weight: 55-60 parts of titanium powder, 15-20 parts of fiber, 5-10 parts of anionic surfactant and 100 parts of deionized water.
Wherein the fiber is one or more of asbestos cement, steel fiber, glass fiber, polypropylene fiber, carbon fiber soil, plant fiber or high-elastic modulus synthetic fiber.
The titanium powder is prepared by the following method:
adding 10-15 parts of deionized water into a reaction kettle, starting stirring, adding maleic anhydride, slowly heating to 70 ℃, and then respectively dropwise adding acrylic acid, allyl amine and ammonium persulfate solution, wherein the weight ratio of maleic anhydride: acrylic acid: the molar ratio of allyl amine is 17-20: 10: 1-5 parts by mass of ammonium persulfate, controlling the temperature to be 72-75 ℃, reacting for 2 hours, keeping the temperature for 1 hour, and finally cooling and discharging to obtain the titanium ene powder.
The method for preparing the composite shrinkage reducing agent of the large-flow collapsible loess comprises the following steps:
uniformly mixing the titanium powder, the anionic surfactant and the deionized water according to the proportion, stirring for 0.5h, adding the fiber, and stirring for 0.5-2.5 h to obtain the composite shrinkage-reducing agent suitable for the large-flow collapsible loess.
The invention also provides application of the composite shrinkage-reducing agent suitable for the large fluid state collapsible loess in the aspect of improving the large fluid state collapsible property of the loess.
The invention also provides application of the composite shrinkage-reducing agent suitable for the large-flow collapsible loess in improving self-weight collapsibility of the loess.
The technical solution of the present invention will be further described with reference to specific examples and experimental data.
The structural formula of the alkene titanium powder is as follows:
the synthesis path is as follows:
wherein the catalyst is Na2S2O8The amount used is 1% of the total mass.
The preparation process comprises the following steps:
adding 10-15 parts of deionized water into a reaction kettle, starting stirring, adding maleic anhydride, slowly heating to 70 ℃, and then respectively dropwise adding acrylic acid, allyl amine and ammonium persulfate solution, wherein the weight ratio of maleic anhydride: acrylic acid: allyl amine: the molar ratio of (A) to (B) is 17-20: 10: 1-5 parts by mass of ammonium persulfate, controlling the temperature to be 72-75 ℃, reacting for 2-3 hours, keeping the temperature for 0.5-1 hour, and finally cooling and discharging to obtain the titanium ene powder.
The titanium ene powder can be used for improving the problems of large-flow-state collapsibility and workability of loess.
The composite shrinkage reducing agent for the large-flow-state collapsible loess can be prepared by taking the titanium powder as a main material, and comprises 50-70 parts by mass of the titanium powder, 15-20 parts by mass of fiber and 5-10 parts by mass of an anionic surfactant, wherein the titanium powder, the anionic surfactant and deionized water are uniformly mixed, stirred for 0.5h, added with the fiber and stirred for 0.5-2.5 h, and the composite shrinkage reducing agent for the large-flow-state collapsible loess can be prepared.
The fiber is one or more of asbestos cement, steel fiber, glass fiber, polypropylene fiber, carbon fiber soil, plant fiber or high elastic modulus synthetic fiber.
Example 1
The composite shrinkage reducing agent for the large-flow-state collapsible loess can be prepared by taking the titanium powder as the main material, and comprises 70 parts by mass of the titanium powder, 15 parts by mass of fiber and 8 parts by mass of anionic surfactant, wherein the titanium powder, the anionic surfactant and 7 parts by mass of deionized water are uniformly mixed, stirred for 0.5h, added with the fiber and stirred for 2 h.
The titanium powder of this example was prepared as follows:
adding 12 parts of deionized water into a reaction kettle, starting stirring, adding maleic anhydride, slowly heating to 70 ℃, and then respectively dropwise adding acrylic acid, allyl amine and ammonium persulfate solution, wherein the mass ratio of maleic anhydride: acrylic acid: allyl amine: in a molar ratio of 17: 10: 3, controlling the temperature to be 75 ℃ and reacting for 3 hours, keeping the temperature for 1 hour, and finally cooling and discharging to prepare the titanium ene powder, wherein the adding amount of ammonium persulfate is 1 mass percent.
Example 2
The composite shrinkage reducing agent for the large fluid state collapsible loess can be prepared by taking the titanium powder as the main material, and comprises 60 parts by mass of the titanium powder, 20 parts by mass of fiber and 10 parts by mass of anionic surfactant, wherein the titanium powder, the anionic surfactant and 10 parts by mass of deionized water are uniformly mixed, stirred for 0.5h, added with the fiber and stirred for 2.5 h.
The titanium powder of this example was prepared as follows:
adding 15 parts of deionized water into a reaction kettle, starting stirring, adding maleic anhydride, slowly heating to 70 ℃, and then respectively dropwise adding acrylic acid, allyl amine and ammonium persulfate solution, wherein the weight ratio of maleic anhydride: acrylic acid: allyl amine: in a molar ratio of 20: 10: 5, controlling the temperature to be 75 ℃ and reacting for 2 hours, keeping the temperature for 1 hour, and finally cooling and discharging to prepare the titanium ene powder, wherein the adding amount of ammonium persulfate is 1 mass percent.
Example 3
The composite shrinkage reducing agent for the large fluid state collapsible loess can be prepared by taking the titanium powder as the main material, and comprises 50 parts by mass of the titanium powder, 18 parts by mass of fiber and 5 parts by mass of anionic surfactant, wherein the titanium powder, the anionic surfactant and 27 parts by mass of deionized water are uniformly mixed, stirred for 0.5h, added with the fiber and stirred for 0.5 h.
The titanium powder of this example was prepared as follows:
adding 10 parts of deionized water into a reaction kettle, starting stirring, adding maleic anhydride, slowly heating to 70 ℃, and then respectively dropwise adding acrylic acid, allyl amine and ammonium persulfate solution, wherein the weight ratio of maleic anhydride: acrylic acid: allyl amine: in a molar ratio of 18: 10: 1, controlling the temperature to be 72 ℃ and reacting for 2 hours, keeping the temperature for 0.5 hour, and finally cooling and discharging to obtain the alkene titanium powder.
Taking geological survey of first project as an example, determination of the collapsibility of collapsible loess through a collapsibility coefficient is carried out to check the improvement effect of the titanium ene powder on the collapsibility of loess. This collapsible loess carries out two sets of contrast tests for the dead weight collapsible loess, and experimental one is former loess, has added the titanium powder in the used loess of experimental two, surveys the collapsible coefficient of collapsible loess through the single line method, and the collapsible coefficient of experimental one is 0.22, and the collapsible coefficient of experimental two is 0.19, and is visible, the collapsible nature of improvement collapsible loess that the titanium powder can be showing. The workability of collapsible loess is measured by a weibo consistency method, the weibo consistency of the first test is 20, the weibo consistency of the second test is 6, and therefore, the workability of the collapsible loess can be obviously improved by the titanium powder.
Taking geological survey of the second project as an example, the determination of the collapsibility of collapsible loess is carried out to check the improvement effect of the composite shrinkage-reducing agent on the collapsibility of loess. This collapsible loess carries out two sets of contrast tests for the dead weight collapsible loess, and experimental three is former loess, has added the compound shrinkage reducing agent of embodiment 1 in experimental four used loess, measures the collapsible coefficient of collapsible loess through the bilinear method, and the collapsible coefficient of experimental three is 0.31, and the collapsible coefficient of experimental four is 0.25, and is visible, the improvement collapsible loess's that compound shrinkage reducing agent can be showing collapsible nature.
The present invention and the technical contents not specifically described in the above embodiments are the same as the prior art.
The present invention is not limited to the above-described embodiments, and the present invention can be implemented with the above-described advantageous effects.
The above embodiments are only specific embodiments disclosed in the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention disclosed in the present invention should be subject to the scope of the claims.
Claims (9)
1. A new use of titanium alkene powder in improving loess collapsibility in large fluid state is provided.
2. A new use of titanium alkene powder in improving loess workability is provided.
3. A composite shrinkage reducing agent suitable for large-flow collapsible loess is characterized in that: the composite shrinkage reducing agent comprises the following raw materials in parts by weight: 50-70 parts of titanium powder, 15-20 parts of fiber and 5-10 parts of anionic surfactant.
4. The composite shrinkage reducing agent for high-fluid collapsible loess according to claim 3, wherein: the composite shrinkage reducing agent comprises the following raw materials in parts by weight: 55-60 parts of titanium powder, 15-20 parts of fiber, 5-10 parts of anionic surfactant and 100 parts of deionized water.
5. The composite shrinkage reducing agent for loess having a high fluid collapsibility as claimed in claim 3, wherein the fiber is one or more of asbestos cement, steel fiber, glass fiber, polypropylene fiber, carbon fiber soil, plant fiber or high elastic modulus synthetic fiber.
6. The composite shrinkage reducing agent for high-fluidity collapsible loess according to claim 4, wherein: the titanium powder is prepared by the following method:
adding a certain mass of deionized water into a reaction kettle, starting stirring, adding maleic anhydride, slowly heating to 70 ℃, and then respectively dropwise adding acrylic acid, allyl amine and ammonium persulfate solution, wherein the mass ratio of maleic anhydride: acrylic acid: the molar ratio of allyl amine is 17-20: 10: 1-5 parts by mass of ammonium persulfate, controlling the temperature to be 72-75 ℃, reacting for 2 hours, keeping the temperature for 1 hour, and finally cooling and discharging to obtain the titanium ene powder.
7. The method for preparing a composite shrinkage-reducing agent for loess having high fluid collapsibility according to claim 4, wherein: the method comprises the following steps:
uniformly mixing the titanium powder, the anionic surfactant and the deionized water according to the proportion, stirring for 0.5h, adding the fiber, and stirring for 0.5-2.5 h to obtain the composite shrinkage-reducing agent suitable for the large-flow collapsible loess.
8. The use of the composite shrinkage-reducing agent for loess in the major fluid state as claimed in claim 3 or 4 for improving the major fluid state collapsibility of loess.
9. Use of the composite shrinkage-reducing agent for high-fluidity collapsible loess according to claim 3 or 4 for improving self-weight collapsibility of loess.
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