CN116445165A - Improved expansive soil and preparation method thereof - Google Patents
Improved expansive soil and preparation method thereof Download PDFInfo
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- CN116445165A CN116445165A CN202310227582.6A CN202310227582A CN116445165A CN 116445165 A CN116445165 A CN 116445165A CN 202310227582 A CN202310227582 A CN 202310227582A CN 116445165 A CN116445165 A CN 116445165A
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- 239000002689 soil Substances 0.000 title claims abstract description 142
- 238000002360 preparation method Methods 0.000 title abstract description 6
- 241000609240 Ambelania acida Species 0.000 claims abstract description 84
- 239000010905 bagasse Substances 0.000 claims abstract description 84
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 63
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 43
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 43
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 43
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 claims abstract description 39
- 230000006872 improvement Effects 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000003607 modifier Substances 0.000 claims abstract description 13
- 238000005056 compaction Methods 0.000 claims abstract description 12
- 238000010998 test method Methods 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 98
- 238000000034 method Methods 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 239000002985 plastic film Substances 0.000 claims description 11
- 229920006255 plastic film Polymers 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims 1
- 239000006227 byproduct Substances 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000011161 development Methods 0.000 abstract description 2
- 239000002440 industrial waste Substances 0.000 abstract description 2
- 239000004927 clay Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008961 swelling Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 229910052900 illite Inorganic materials 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052622 kaolinite Inorganic materials 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 235000013343 vitamin Nutrition 0.000 description 1
- 229940088594 vitamin Drugs 0.000 description 1
- 229930003231 vitamin Natural products 0.000 description 1
- 239000011782 vitamin 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
-
- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses improved expansive soil and a preparation method thereof. The addition amount of the slaked lime is 2.5-6.25% of the mass of the expansive soil, and the addition amount of the bagasse is 0.5-2% of the mass of the expansive soil. The improvement steps are as follows: 1. completely mixing the modifier and the expansive soil by using a mechanical stirrer; 2. determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure; 3. adding water into the mixed expansive soil obtained in the step 1 according to the determined water content of the optimal water content, and performing choke plug under natural conditions to obtain the improved expansive soil. The improved expansive soil prepared by the invention improves the performance of the expansive soil and reduces the expansion rate of the expansive soil. Is beneficial to solving the influence of the byproducts of the industrial wastes on the environment and meets the requirement of green sustainable development.
Description
Technical Field
The invention relates to the field of expansive soil, in particular to improved expansive soil and a preparation method thereof.
Background
The expansive soil is a clay component, is mainly composed of hydrophilic minerals, such as montmorillonite, illite, kaolinite and the like, and has large water-swelling, water-loss shrinkage performance and strength attenuation. Because of the damage of expansive soil to buildings, expansive soil is known as a "hidden disaster". The loss of expansive soil annually over 50 million dollars worldwide is not fully counted. Therefore, the problem about expansive soil has been paid great attention to the international and domestic engineering world. The main methods for treating expansive soil at present are a filling method, a physical improvement method, a chemical improvement method, a biological improvement method, a sealing cover method and an interlayer method. However, the method has the problems of high cost, inconvenient construction and the like, and is not beneficial to wide-range application.
Bagasse fibers are a byproduct of fibrous waste obtained after juice extraction and sugar production of sugarcane in a sugar production process. Bagasse fibers have many uses as combustible materials for energy supply. Bagasse fibers have the potential for building materials and soil reinforcement in the construction field, as they are renewable, biodegradable, environmentally friendly, low density and low cost materials.
Lime stabilization is the most common method of controlling the shrinkage and expansion behavior of expansive soil due to seasonal variations. Lime reacts with the swelling clay in the presence of water to change the physical and chemical properties of the swelling clay, thereby changing the engineering properties of the soil.
Disclosure of Invention
Aiming at the existing expansion geotechnical engineering problem in China, creative cooperative utilization of expansion soil, bagasse fibers and lime can be well in accordance with the 'green traffic' policy in road engineering construction, waste resources can be fully utilized, the purpose of protecting the environment is achieved, and a large amount of funds can be saved. Therefore, the invention provides a comprehensive improvement scheme of expansive soil.
The invention aims to provide improved expansive soil which has high strength and low expansion rate and can better meet the application requirements of expansive soil roadbed in roadbed and pavement engineering.
The second purpose of the invention is to provide a preparation method of the improved expansive soil, which has the advantages of simple method, convenient operation, low cost, high preparation strength and low expansion rate.
The invention further aims to provide an application of the improved expansive soil in expansive soil roadbed in geotechnical engineering.
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides an improved expansive soil, characterized in that: the expansive soil is subjected to improvement treatment by using an improver to obtain the modified expansive soil; it comprises the following components:
the modifier comprises slaked lime and bagasse fibers; the addition amount of the slaked lime is 0.5-2% of the mass of the expansive soil, and the addition amount of the bagasse fiber is 2.5-6.25% of the mass of the expansive soil;
the bagasse fiber is waste of a sugar refinery; the bagasse fiber has the diameter of 0.3 mm-3.1 mm, the length of 0.3 mm-13.8 mm, the average water content of 99.84 percent and the average tensile strength of 96.24 +/-29.95 MPa; the bagasse fibre was air-dried in a room environment at a temperature of 25 ℃ and a relative humidity of 80% until its quality remained constant;
the dried bagasse fibers pass through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen are used as an improver;
the lime contains 85% -95% of calcium hydroxide.
As a preferred scheme, bagasse fibers and slaked lime are mixed within the mass fraction ranges of 0.5% -2% and 2.5% -6.25% of the expansive soil to be treated respectively.
Further, soil having a particle size of less than 2.36mm was prepared.
In a second aspect, the present invention provides a method for preparing an improved expansive soil as described above, characterized by: the method comprises the following steps:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the determined water content of the optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, thus obtaining the improved expansive soil filler.
Compared with the prior art, the invention has the following advantages:
1. the improved expansive soil has good comprehensive performance, can improve the bad characteristics of the weak expansive soil, and reduces the engineering harm caused by the weak expansive soil.
2. The bagasse fiber used in the invention is waste of sugar factories, and the hydrated lime mud fiber combination is used in the stabilization of expansive soil, so that the influence of industrial waste byproducts on the environment is solved, and the requirements of green sustainable development are met.
3. The addition of bagasse fiber in the invention can form new complex between the improved expansion soil bodies, and increase the compactness of the soil bodies, thereby reinforcing the soil bodies and improving the cohesiveness of the improved soil.
4. The lime can be doped in the invention to reduce the dispersibility and expansibility of the expansive soil and improve the water stability by the ion exchange, carbonation, gel reaction, crystallization and the like of the lime, thereby further improving the strength of the expansive soil.
5. The invention can more scientifically utilize the lime and bagasse fiber mixture, and has simple operation, saving and environmental protection.
Detailed Description
The technical scheme of the invention is further explained below by combining specific embodiments, and before the specific embodiments are introduced, the background conditions related to part of experimental materials and the like in the following embodiments are briefly explained.
Bagasse fibers, slaked lime and expansive soil adopted in the invention are conventional raw materials.
Table 1 shows the physical properties of the expansive soil
The bagasse fibre was taken from a sugar mill and the fibre obtained was air dried in a room at a temperature of 25 ℃ and a humidity of relatively 80% until its quality remained constant. The air-dried fibers were passed through a 9.5mm mesh screen and the fibers left on the 300um mesh screen were used as a modifier.
Table 2 shows the physical properties of bagasse fibers
Example 1
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 0.5% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 2.5% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 2
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 1.0% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 2.5% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 3
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 2.0% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 2.5% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 4
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 0.5% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 4.5% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 5
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 1.0% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 4.5% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 6
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 2.0% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 4.5% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 7
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 0.5% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 6.25% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 8
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 1.0% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 6.25% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
Example 9
The method for improving the expansive soil comprises the steps of improving the expansive soil by using an improver, wherein the improver comprises bagasse fibers and slaked lime; wherein the addition amount of the bagasse fiber is 2.0% of the mass fraction of the expansive soil, and the addition amount of the slaked lime is 6.25% of the mass fraction of the expansive soil, and the bagasse fiber is air-dried in a room environment with the temperature of 25 ℃ and the relative humidity of 80% until the mass of the bagasse fiber is kept constant. The air dried bagasse fibers were passed through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen were used as a modifier.
The specific improvement steps are as follows:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the water content of the determined optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then performing expansive soil linear shrinkage test and unconfined compressive strength test after curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, wherein the test results are shown in the following table 3.
TABLE 3 Strength Properties of bagasse fibers and slaked lime vitamins improved swelling soil
It can be seen from table 3 that the free expansion rate of the expansive soil is improved and the unconfined compressive strength property is improved along with the incorporation of the slaked lime and the bagasse fiber, and meanwhile, the raw materials have a synergistic effect, particularly the unconfined compressive strength property is improved synergistically. When the mixing amount of bagasse fiber is 2.0%, the mixing amount of slaked lime is 4.5%, and the curing time is 28 days, the unconfined compressive strength of the expansive soil reaches the maximum value, and the linear shrinkage rate basically reaches the smaller value.
While the invention has been described with respect to the preferred embodiments, it will be understood that the invention is not limited thereto, but is capable of modification and variation without departing from the spirit of the invention, as will be apparent to those skilled in the art.
Claims (4)
1. An improved expansive soil, which is characterized in that: the expansive soil is subjected to improvement treatment by using an improver to obtain the modified expansive soil; it comprises the following components:
the modifier comprises slaked lime and bagasse fibers; the addition amount of the slaked lime is 0.5-2% of the mass of the expansive soil, and the addition amount of the bagasse fiber is 2.5-6.25% of the mass of the expansive soil;
the bagasse fiber is waste of a sugar refinery; the bagasse fiber has the diameter of 0.3 mm-3.1 mm, the length of 0.3 mm-13.8 mm, the average water content of 99.84 percent and the average tensile strength of 96.24 +/-29.95 MPa; the bagasse fibre was air-dried in a room environment at a temperature of 25 ℃ and a relative humidity of 80% until its quality remained constant;
the dried bagasse fibers pass through a 9.5mm mesh screen, and the fibers left on the 300um mesh screen are used as an improver;
the lime contains 85% -95% of calcium hydroxide.
2. The improved expansive soil of claim 1, wherein: the bagasse fibers and the slaked lime are respectively mixed within the mass fraction range of 0.5-2% and 2.5-6.25% of the expansive soil to be treated.
3. The improved expansive soil of claim 2, wherein: soil with a particle size of less than 2.36mm was prepared.
4. A method of preparing the modified bentonite according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
s1) completely mixing bagasse fibers, slaked lime and a soil sample by using a mechanical stirrer;
s2) determining the optimal water content of the mixed expansive soil according to a heavy compaction test in JTG E40-2007 of Highway geotechnical test procedure;
s3) adding water into the mixed expansive soil obtained in the step S1 according to the determined water content of the optimal water content, uniformly stirring, sealing by using a plastic film to prevent water change, and then curing for 3, 7 and 28 days in an indoor environment with 25 ℃ and relative humidity of 80%, thus obtaining the improved expansive soil filler.
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