CN117343736A - Method for preparing soil curing agent by utilizing agricultural waste straws - Google Patents
Method for preparing soil curing agent by utilizing agricultural waste straws Download PDFInfo
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- CN117343736A CN117343736A CN202311131227.5A CN202311131227A CN117343736A CN 117343736 A CN117343736 A CN 117343736A CN 202311131227 A CN202311131227 A CN 202311131227A CN 117343736 A CN117343736 A CN 117343736A
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- soil
- curing agent
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- mixed solution
- urea
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- 239000002689 soil Substances 0.000 title claims abstract description 84
- 239000010902 straw Substances 0.000 title claims abstract description 47
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002154 agricultural waste Substances 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000002156 mixing Methods 0.000 claims abstract description 29
- 239000004202 carbamide Substances 0.000 claims abstract description 25
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005056 compaction Methods 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000011398 Portland cement Substances 0.000 claims abstract description 11
- 230000001737 promoting effect Effects 0.000 claims abstract description 11
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 239000004576 sand Substances 0.000 claims abstract description 6
- 239000011259 mixed solution Substances 0.000 claims description 31
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 26
- 230000008014 freezing Effects 0.000 claims description 20
- 238000007710 freezing Methods 0.000 claims description 20
- 230000008018 melting Effects 0.000 claims description 20
- 238000002844 melting Methods 0.000 claims description 20
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 238000001914 filtration Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 8
- 239000001913 cellulose Substances 0.000 claims description 7
- 229920002678 cellulose Polymers 0.000 claims description 7
- 229920005610 lignin Polymers 0.000 claims description 7
- 229920002488 Hemicellulose Polymers 0.000 claims description 6
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- 240000008042 Zea mays Species 0.000 claims description 6
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 6
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 6
- 235000005822 corn Nutrition 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 5
- 239000003583 soil stabilizing agent Substances 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims description 3
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 241000209140 Triticum Species 0.000 claims description 3
- 235000021307 Triticum Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 239000002585 base Substances 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims description 2
- 239000004568 cement Substances 0.000 abstract description 8
- 239000002910 solid waste Substances 0.000 abstract description 7
- 238000007711 solidification Methods 0.000 abstract description 5
- 230000008023 solidification Effects 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 238000010257 thawing Methods 0.000 abstract description 3
- 229910003471 inorganic composite material Inorganic materials 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 18
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002861 polymer material Substances 0.000 description 4
- 125000003198 secondary alcohol group Chemical group 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920005615 natural polymer Polymers 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009881 electrostatic interaction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 150000003333 secondary alcohols Chemical class 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- 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
- C09K17/42—Inorganic compounds mixed with organic active ingredients, e.g. accelerators
- C09K17/44—Inorganic compounds mixed with organic active ingredients, e.g. accelerators the inorganic compound being cement
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
A method for preparing soil curing agent by utilizing agricultural waste straw belongs to the field of inorganic composite materials. The invention selects agricultural waste straw as raw material, uses alkali and urea to mix to form treatment liquid, and filters to obtain clear liquid after repeated freeze thawing cycle, thus the invention can be used as efficient soil solidifying agent. The curing agent with the mass fraction of 1% is used for mixing with a soil sample (maximum dry density of 1.97 and optimal water content of 10.9%), 6% of ordinary Portland cement is added, the mixture is rolled to the compactness of 97%, and after seven days of standard curing, the unconfined compressive strength of soil blocks can be improved by more than 20%, so that the soil compaction promoting effect is obvious. The method of the invention utilizes the agricultural solid waste straw as the raw material to extract the soil curing agent, reduces the preparation cost of the soil curing agent, and realizes the effective recycling of resources. The method has the advantages of effectively promoting soil solidification, reducing the use amount of cement, and having good application prospects in the aspects of sand fixation, soil fixation and highway construction.
Description
Technical Field
The invention relates to the field of organic-inorganic composite materials, in particular to a method for preparing a novel soil curing agent by extracting lignin, hemicellulose, cellulose and other natural biomolecules from agricultural planting waste straws.
Background
Cement is a traditional hydraulic cementing material, can firmly bond sand and stone materials together, and is widely applied to the fields of civil construction and the like. However, a large amount of carbon dioxide gas is generated in the cement production process, so that the aim of sustainable development is achieved, and the use amount of cement is greatly reduced, so that the cement becomes a focus of attention in the field of research and development of novel building materials.
Similar to the gelation of cement to sand and stone materials, excellent coating and crosslinking of organic polymer materials to inorganic particles have been continuously reported in the field of functional composite materials. By utilizing the characteristic of high electric charge of the high polymer material, the electric charge on the surface of the soil particles can be effectively neutralized, the thickness of a polarized water film on the surface of the soil particles is greatly reduced, and the close accumulation among the particles is promoted. Meanwhile, the high polymer chains are wound among different particles and are subjected to electrostatic interaction, so that the particles are tightly connected to form a gel network. Therefore, the polymer material has the potential application advantage of replacing cement as a cementing material.
Besides synthetic polymers, a large number of natural polymer materials exist in nature, and particularly some agricultural wastes such as crop straws are rich in natural polymer components such as lignin, cellulose and the like. The molecules are rich in hydroxyl and active secondary alcohol groups, and have the effects of reducing the thickness of a water film on the surface of soil particles and promoting soil compaction. Along with the progress of technology, the comprehensive development and utilization of the straw have a certain effect, but the research of applying the straw to the soil cementing material is not reported at present.
Therefore, in the invention, straw powder is treated by using strong alkali urea mixed solution, and after repeated freeze thawing cycle and filtration treatment, organic matter extract in straw is obtained, and is directly used as soil solidifying agent and mixed with soil in a certain proportion, and hydroxyl and secondary alcohol groups rich in straw dissolved molecules are interacted with the surface of soil particles to reduce the surface charge of the soil particles, promote the close accumulation of soil particles and achieve the aim of soil solidification. Meanwhile, the agricultural solid waste is utilized for soil solidification, so that the solid waste is effectively reused to a certain extent, and the production cost is saved.
Disclosure of Invention
The invention aims to recycle agricultural solid waste straws, fully utilize natural organic molecules such as lignin, hemicellulose and cellulose, improve the surface properties of soil particles and achieve the aim of promoting compaction of the soil particles.
The technical scheme of the invention is that straw powder with different meshes is selected and soaked in alkali and urea solution, repeated freeze thawing cycle is carried out, organic molecules such as lignin, hemicellulose and cellulose are promoted to be dissolved out, and as the natural molecules contain active groups such as phenolic hydroxyl groups, secondary alcohol groups and the like, the surface charge of soil particles can be greatly reduced, the thickness of a water film is reduced, and soil compaction is promoted. The solution is used as a soil curing agent, so that the unconfined compressive strength of the soil can be improved by more than 20%.
A method for preparing a soil stabilizer by utilizing agricultural waste straws comprises the following steps:
(1) Preparation of straw and alkali-urea mixed solution
Mixing straw powder, strong alkali, urea and deionized water, and uniformly stirring; the mixed solution comprises the following components in percentage by weight: 3-5% of straw powder, 10-300% of straw powder mesh number, 5-12% of strong alkali, 5-12% of urea and the balance of deionized water;
(2) Freezing the mixed solution obtained in the step (1) in a refrigerator at 25-15 ℃ below zero for 10-14 hours, taking out and melting at room temperature, then freezing in the refrigerator at 25-15 ℃ below zero for 10-14 times, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil curing agent, and calculating the solid content to be about 21% after the curing agent is dried;
(4) Adding 10 times of water into the curing agent obtained in the step (3) to mix uniformly to obtain mixed water, mixing the mixed water into soil and ordinary Portland cement to mix uniformly, compacting and curing for 7 days, testing the unconfined compressive strength, and evaluating the effect of promoting soil compaction; wherein the addition amount of the mixed water in each 10 parts of soil sample and 0.6 part of common silicate cement P.O 42.5.5 mixed soil is between 0.1 and 2.5 percent.
Further, the strong base is sodium hydroxide, potassium hydroxide or lithium hydroxide.
Further, the straw powder in the step (1) is corn straw powder, wheat straw powder, rice straw powder and the like.
Further, the compaction degree of the compaction in the step (4) is 97%, and the curing conditions are as follows: 20+ -1deg.C, 98% + -2% humidity.
Further, the soil sample in the step (4) is various sandy soil, and has a more obvious solidification promoting effect on the soil with high sand content.
The preparation method of the soil curing agent comprises the following specific preparation steps:
(1) Mixing 4 parts of straw powder with 20 meshes, 7 parts of sodium hydroxide, 12 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, collecting clear liquid, namely the prepared soil solidifying agent, and calculating the solid content to be 21% after drying;
(4) Mixing 0.1 part of the curing agent obtained in the step (3) with 1 part of water uniformly, mixing uniformly with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5, compacting to 97%, and curing: after 7 days at 20+ -1deg.C and 98% + -2% humidity, unconfined compressive strength was tested and soil compaction promoting effect was evaluated.
The technical key points of the invention are as follows:
1. the agricultural solid waste straw powder is selected as a raw material, natural molecules such as lignin, hemicellulose, cellulose and the like in the agricultural solid waste straw powder are dissolved under the action of strong alkali and urea, active groups such as phenolic hydroxyl groups, secondary alcohols and the like which are rich in molecular structures are utilized to act with the surfaces of negatively charged soil particles, the surface potential of the soil particles is reduced, the thickness of a water film is reduced, and the compaction among the soil particles is promoted. Meanwhile, the molecules have rich active groups and can act on the surfaces of a plurality of soil particles at the same time, so that the soil particles are bridged, and the compaction of the soil particles is further promoted.
2. The prepared soil curing agent is suitable for sandy soil, and is characterized in that lignin, hemicellulose, cellulose and other components in the curing agent are rich in hydroxyl groups, have moderate water absorption and have an effective binding effect on sandy soil.
The method of the invention utilizes the agricultural solid waste straw as the raw material to extract the soil curing agent, reduces the preparation cost of the soil curing agent, and realizes the effective recycling of resources. The method has the advantages of effectively promoting soil solidification, reducing the use amount of cement, and having good application prospects in the aspects of sand fixation, soil fixation and highway construction.
Drawings
Fig. 1 is a schematic diagram of an agricultural waste straw preparation soil stabilizer.
Detailed Description
The principles and features of the present invention are described below in connection with examples to illustrate the invention and not to limit the scope of the invention.
Example 1:
(1) Preparation of straw and alkali-urea mixed solution
Mixing 4 parts of corn stalk powder (20 meshes), 7 parts of sodium hydroxide, 12 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil solidifying agent (after drying, the calculated solid content is about 20.4 percent);
(4) Mixing 0.1 part of the curing agent obtained in the step (3) with 1 part of water uniformly, mixing the mixture with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5 uniformly, compacting (compaction degree is 97%), curing (20+/-1 ℃,98% +/-2% humidity) for 7 days, and testing the unconfined compressive strength of the mixture to be 3.32MPa.
Example 2:
(1) Preparation of straw and alkali-urea mixed solution
Mixing 4 parts of wheat straw powder (20 meshes), 7 parts of potassium hydroxide, 12 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil solidifying agent (after drying, calculating the solid content to be about 21.0 percent);
(4) Mixing 0.1 part of the curing agent obtained in the step (3) with 1 part of water uniformly, mixing the mixture with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5 uniformly, compacting (compaction degree is 97%), curing (20+/-1 ℃,98% +/-2% humidity) for 7 days, and testing the unconfined compressive strength of the mixture to be 2.94MPa.
Example 3:
(1) Preparation of straw and alkali-urea mixed solution
Mixing 4 parts of rice straw powder (20 meshes), 7 parts of sodium hydroxide, 12 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil solidifying agent (after drying, calculating the solid content to be about 21.9 percent);
(4) Mixing 0.1 part of the curing agent obtained in the step (3) with 1 part of water uniformly, mixing the mixture with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5 uniformly, compacting (compaction degree is 97%), curing (20+/-1 ℃,98% +/-2% humidity) for 7 days, and testing the unconfined compressive strength of the mixture to be 3.03MPa.
Example 4:
(1) Preparation of straw and alkali-urea mixed solution
Mixing 4 parts of corn stalk powder (300 meshes), 7 parts of sodium hydroxide, 12 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil solidifying agent (after drying, the calculated solid content is about 20.4 percent);
(4) Mixing 0.1 part of the curing agent obtained in the step (3) with 1 part of water uniformly, mixing the mixture with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5 uniformly, compacting (compaction degree is 97%), curing (20+/-1 ℃,98% +/-2% humidity) for 7 days, and testing the unconfined compressive strength of the mixture to be 3.25MPa.
Example 5:
(1) Preparation of straw and alkali-urea mixed solution
Mixing 4 parts of corn stalk powder (20 meshes), 5 parts of sodium hydroxide, 10 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil solidifying agent (after drying, the calculated solid content is about 20.4 percent);
(4) Mixing 0.1 part of the curing agent obtained in the step (3) with 1 part of water uniformly, mixing the mixture with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5 uniformly, compacting (compaction degree is 97%), curing (20+/-1 ℃,98% +/-2% humidity) for 7 days, and testing the unconfined compressive strength of the mixture to be 3.12MPa.
Example 6:
(1) Preparation of straw and alkali-urea mixed solution
Mixing 4 parts of corn stalk powder (20 meshes), 7 parts of sodium hydroxide, 12 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil solidifying agent (after drying, the calculated solid content is about 20.4 percent);
(4) Mixing 0.50 part of the curing agent obtained in the step (3) with 0.7 part of water uniformly, mixing with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5 uniformly, compacting (compactness 97%), curing (20+/-1 ℃ and 98+/-2% humidity) for 7 days, and testing the unconfined compressive strength to be 3.34MPa.
Claims (6)
1. The method for preparing the soil curing agent by utilizing the agricultural waste straws is characterized by comprising the following steps of:
(1) Preparation of straw and alkali-urea mixed solution
Mixing straw powder, strong alkali, urea and deionized water, and uniformly stirring; the mixed solution comprises the following components in percentage by weight: 3-5% of straw powder, 10-300% of straw powder mesh number, 5-12% of strong alkali, 5-12% of urea and the balance of deionized water;
(2) Freezing the mixed solution obtained in the step (1) in a refrigerator at 25-15 ℃ below zero for 10-14 hours, taking out and melting at room temperature, then freezing in the refrigerator at 25-15 ℃ below zero for 10-14 times, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, and collecting clear liquid, namely the prepared soil curing agent, and calculating the solid content to be 21% after the curing agent is dried;
(4) Adding 10 times of water into the soil curing agent obtained in the step (3) to uniformly mix to obtain mixed water, mixing the mixed water into soil and ordinary Portland cement to uniformly mix, compacting and curing for 7 days, testing the unconfined compressive strength, and evaluating the effect of promoting soil compaction; wherein the addition amount of the mixed water in each 10 parts of soil sample and 0.6 part of common silicate cement P.O 42.5.5 mixed soil is between 0.1 and 2.5 percent;
the soil solidifying agent comprises alkali, urea and straw dissolved biological molecules including lignin, hemicellulose and cellulose as effective components.
2. The method for preparing soil solidifying agent according to claim 1, wherein the strong base in the step (1) is sodium hydroxide, potassium hydroxide or lithium hydroxide.
3. The method for preparing soil solidifying agent according to claim 1, wherein the straw powder in the step (1) is corn straw powder, wheat straw powder, rice straw powder.
4. The method of preparing soil stabilizer according to claim 1, wherein the compacting degree of the compacting in the step (4) is 97%, and the curing conditions are: 20+ -1deg.C, 98% + -2% humidity.
5. The method for preparing the soil solidifying agent according to claim 1, wherein the soil sample in the step (4) is various sandy soil, and has a more obvious solidifying promoting effect on the soil with high sand content.
6. The method for preparing the soil stabilizer according to claim 1, wherein the specific preparation steps are as follows:
(1) Mixing 4 parts of straw powder with 20 meshes, 7 parts of sodium hydroxide, 12 parts of urea and 77 parts of deionized water, and uniformly stirring;
(2) Freezing the mixed solution obtained in the step (1) for 12 hours at the temperature of minus 20 ℃ in a refrigerator, taking out and melting at room temperature, then freezing for 12 hours at the temperature of minus 20 ℃ in the refrigerator, melting at room temperature, and circulating for 3 times;
(3) Taking the mixed solution obtained in the step (2), filtering, collecting clear liquid, namely the prepared soil solidifying agent, and calculating the solid content to be 21% after drying;
(4) Mixing 0.1 part of the curing agent obtained in the step (3) with 1 part of water uniformly, mixing uniformly with 10 parts of soil sample and 0.6 part of ordinary Portland cement P.O 42.5.5, compacting to 97%, and curing: after 7 days at 20+ -1deg.C and 98% + -2% humidity, unconfined compressive strength was tested and soil compaction promoting effect was evaluated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311131227.5A CN117343736A (en) | 2023-09-04 | 2023-09-04 | Method for preparing soil curing agent by utilizing agricultural waste straws |
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| CN202311131227.5A CN117343736A (en) | 2023-09-04 | 2023-09-04 | Method for preparing soil curing agent by utilizing agricultural waste straws |
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