CN110028288A - A kind of modification method backfilling salinized soil - Google Patents
A kind of modification method backfilling salinized soil Download PDFInfo
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- CN110028288A CN110028288A CN201910387316.3A CN201910387316A CN110028288A CN 110028288 A CN110028288 A CN 110028288A CN 201910387316 A CN201910387316 A CN 201910387316A CN 110028288 A CN110028288 A CN 110028288A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
-
- 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
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of modification methods for backfilling salinized soil, salinized soil is improved by lime+flyash+cement+modifying agent, a variety of mix-designs are carried out using lime, flyash, cement, modifying agent, to various solidification schemes carry out physical and mechanical property research, propose intensity be suitable for, the good solidification scheme of durability.Lime, cement, flyash, modifying agent are mixed each proportion and establish orthogonality relation with unconfined compressive strength, the steady coefficient of water and infiltration coefficient, intuitively analyzed test result, range analysis by the present invention by orthogonal test；It obtains the influence of the different factors and different level to improvement salinized soil intensity, selects optimum proportion scheme；The relationship between each factor is scientifically analyzed, scientific theory is provided for site operation and supports.
Description
Technical field
The present invention relates to a kind of modification methods for backfilling salinized soil, and in particular to a kind of to be reached by design rational formula
The scientific method of modified backfill salinized soil, belongs to construction engineering technical field.
Background technique
It by salt and alkali component effect in the soil body is included various solonchak and alkaline earth and other difference journeys that salinized soil, which is a series of,
Spend the general designation of the various types soil of salinization.During forming salinized soil, Soil Salinization Process is played a leading role or is shown
Works is used, and the denominator of various types salinized soil is exactly the salt and alkali component containing aobvious amount in soil, is had undesirable physico
Learn property.Salinized soil has the physics and engineering characteristic different from general soil: 1. three phase compositions of salinized soil and it is general native not
Together, salting liquid is contained in liquid phase, crystal salt, especially readily soluble crystal salt are contained in solid phase.Their phase transition is big to soil
Part physical index has an impact；2. native physical and mechanical properties index can occur after the salt in salinized soil meets water dissolution
Variation, intensity index are substantially reduced, so salinized soil cannot only consider that original physical and mechanical property under natural endowment refer to
Mark；3. after brining ground foundation immersion, it is molten sunken to generate ground because of salt dissolution.4. certain salinized soil (such as the soil of sulfur acid sodium)
Base can generate volume expansion in temperature or humidity variation, cause damages to building and ground installation；5. the salt in salinized soil
Solution will lead to the material corrosion of building and underground installation.Property and state and salting liquid of the extent of corrosion depending on material
Concentration etc..
With the rapid development of our country's economy, a large amount of infrastructure is built, and widely distributed salinized soil ring
Border can generate corrosion failure to concrete structure therein is in, and wherein the sulphate corrosion of concrete is saline soil area coagulation
The main form that soil destroys, and villaumite can then generate destruction, and then corrosion reinforcing bar to the rebar passivation film in armored concrete,
Influence the durability of works or structures.By the way that modified backfill salinized soil test and the research of application technology, this is for salt
The backfill improvement of salt and alkaline land in stain soil area has great importance and engineering value.
Excavation spoir generally taken for brining ground foundation construction at present, the method for soil replacement and backfilling, but this is undoubtedly for salt
It is uneconomic for stain soil area foundation engineering, therefore current sustainable development is met for the exploration of improvement of salt and alkaline land scheme
Requirement, can greatly save the cost, reduce construction budget.It is studied for this requirement by being sampled to salinized soil
The changing rule of its physical property under different larval instar and under different addition quantity, and engineering economy is carried out to different evolutionary approach
Evaluation, it is intended to it solves the practical problem in infrastructure construction in china construction and provides experimental basis for establishment related specifications,
Research achievement is of great significance and acts on to technical progress of industry and socio-economic development.
It is both domestic and external before this to grind in view of the complexity of the salinized soil origin cause of formation, the otherness of the diversity of type and engineering characteristic
Studying carefully and exploring is the engineering characteristic for explaining and proving salinized soil for different purposes, using different theory and methods,
But to the Processing Technology Research of the type soil deficiency, especially because the origin cause of formation of China different regions salinized soil difference, needle
Reasonable processing scheme should be sought to the engineering of different zones.
Summary of the invention
The present invention is intended to provide a kind of modification method for backfilling salinized soil, particular by utilization lime, flyash, water
The materials such as mud, modifying agent (wherein CaO ingredient accounts for 34% -43%) carry out the design of a variety of match ratios, carry out to various solidification schemes
Physical and mechanical property research.It is proposed intensity be suitable for, the good solidification scheme of durability.
The present invention is Ca (OH) under Behavior of Hardened Cement Paste skeleton function by lime+flyash+cement improvement salinized soil2With lime,
The physical chemistry of flyash is coefficient as a result, chemical action makes native particle and micelle particle shape at stable crumb structure, and
Behavior of Hardened Cement Paste then coats and connects into firm entirety these granules；Modifying agent with hydrated reaction of cement progress, activity at
Divide and be excited, generating certain gelatinous mass is completely embedded structure, compression strength enhancing.
The present invention provides a kind of modification methods for backfilling salinized soil, the specific steps are as follows:
(1) prepare test specimen:
1. preparing raw material:
In this research improve salinized soil use with raw material identical in engineering, lime, cement, flyash, modifying agent etc. are
Work as real estate；
Soil sample: this research is quasi- to limit salinized soil as medium sulfate salinized soil, has for the reinforcing bar in concrete and concrete
Moderate corrosion；
Lime: first-class calcareous pulverized limestone is selected；(additional amount is 3%-the 10% of total volume).
Cement: P.O42.5 cement is selected；(additional amount is 0%-the 5% of total volume).
Flyash: II grade of fine-ground fly-ash；(additional amount is 8%-the 15% of total volume).
Modifying agent；(additional amount is 0%-the 5% of total volume, and CaO ingredient accounts for 34% -43% in modifying agent).
2. carrying out compaction test to the improvement salinized soil (see Table 3) under variant proportion using compaction process.According to compacting
Test makes the maximum dry density changing rule figure and optimum moisture content changing rule figure that salinized soil is improved under different ratio respectively.
The concrete operation step of compaction test are as follows: the soil sample being stirred is put into mold first, is paved with entire mold, with mold size
For 40mm × 40mm × 160mm, with one cuboid of iron work, height × width x length of cuboid dimensions be 55mm × 35mm ×
Iron cuboid is placed on salinized soil, is tapped with rubber hammer by 155mm, is compacted by first time, and mold medium salting soil thickness is
The salinized soil surface spatula side road the Hua Ji indentation of first time compacting salt marsh is added into mold by half originally again
Soil twice according to the recycling of upper method completes salinized soil compacting；It is compacted also use when cylinder test specimen, cube specimen iron
Make compacting utensil of corresponding size；Then its maximum dry density and its optimum moisture content are measured.
3. test material preparation:
Sample preparation is carried out according to the resulting each proportion salinized soil maximum dry density of compaction test and optimum moisture content；Test uses three kinds
Size test specimen: cube specimen: 70.7mm × 70.7mm × 70.7mm；Prism test specimen: 40mm × 40mm × 160mm；Cylinder
Body test specimen: φ × h=100mm × 50mm；
4. test block maintenance:
Test uses standard curing: 20 ± 2 DEG C of temperature, humidity is greater than 95%.
(2) physical and mechanical property experimental designs
1. testing program
This paper proposed adoption orthogonal experiment carries out experimental study, and Orthogonal Experiment and Design is as follows:
The selected factor of the test of table 1
2 test factor of table is horizontal
3 test plan of table
This research designs 9 tests altogether, and test prepares 15 groups of test specimens (i.e. five maintenance ages of 3d, 7d, 14d, 28d, 56d altogether every time
Phase, each age each 3 groups of test specimens, wherein each curing age test unconfined compressive strength, the steady coefficient of water and infiltration coefficient, each 1
Group), every group 10 pieces, in addition compaction test is tested, and every group 3 pieces, totally 1350 pieces of test specimens.
4 mechanical property test conceptual design of table
(3) data are analyzed
According to above-mentioned test institute measured data, experimental result is intuitively analyzed, range analysis.Obtain the different factors and different water
The flat influence to improvement salinized soil physical and mechanical property, selects out optimum proportion scheme.
Beneficial effects of the present invention:
1. being directed to the extensive construction method of previous soil replacement and backfilling, this research is intended to establish, and there is the improvement of Shanxi regional feature to return
Salinized soil technical solution is filled out, is studied as each improvement salinized soil of the growth of age is without side resistance to compression limit, the steady coefficient of water and infiltration
The changing rule of coefficient.
2. lime, cement, flyash, modifying agent are mixed each proportion and no side resistance to compression limit, water by orthogonal test
Orthogonality relation is established in steady coefficient and infiltration coefficient test, is intuitively analyzed test result, range analysis.Obtain it is different because
The influence of son and different level to improvement salinized soil intensity, selects optimum proportion scheme.It scientifically analyzes between each factor
Relationship provides scientific theory for site operation and supports.
3. being salt marsh according to on-site test as a result, mechanics and permeance property to each improvement salinized soil proportion are evaluated
Soil area ground excavation and salt marsh earthen backfill and utilizing for similar engineering construction medium salting soil open up new way.
4. utilize field roll compaction test, to it is each improvement salinized soil scheme early period laboratory test results in practical projects
Suitability verified, the leap once from theory into action can be completed.
Detailed description of the invention
Fig. 1 is the maximum dry density of modified salinized soil under different ratio；
Fig. 2 is the optimum moisture content of modified stain soil under different ratio；
Fig. 3 is the unconfined compressive strength of modified salinized soil under 3d different ratio, different larval instar；
Fig. 4 is the unconfined compressive strength of modified salinized soil under 7d different ratio, different larval instar；
Fig. 5 is the unconfined compressive strength of modified salinized soil under 14d different ratio, different larval instar；
Fig. 6 is the unconfined compressive strength of modified salinized soil under 28d different ratio, different larval instar；
Fig. 7 is the unconfined compressive strength of modified salinized soil under 56d different ratio, different larval instar；
Fig. 8 is the steady coefficient value of water of modified salinized soil under 3d different ratio；
Fig. 9 is the steady coefficient value of water of modified salinized soil under 7d different ratio；
Figure 10 is the steady coefficient value of water of modified salinized soil under 14d different ratio；
Figure 11 is the steady coefficient value of water of modified salinized soil under 28d different ratio；
Figure 12 is the steady coefficient value of water of modified salinized soil under 56d different ratio；
Figure 13 is the infiltration coefficient of modified salinized soil under 3d different ratio；
Figure 14 is the infiltration coefficient of modified salinized soil under 7d different ratio；
Figure 15 is the infiltration coefficient of modified salinized soil under 14d different ratio；
Figure 16 is the infiltration coefficient of modified salinized soil under 28d different ratio；
Figure 17 is the infiltration coefficient of modified salinized soil under 56d different ratio.
Specific embodiment
The present invention is further illustrated below by embodiment, but is not limited to following embodiment.
Embodiment 1:
The present invention is further illustrated below by embodiment, but is not limited to following embodiment.
1, the principle of the invention
Lime+flyash+cement improvement salinized soil is Ca (OH) under Behavior of Hardened Cement Paste skeleton function2With lime, flyash it is physico
Learn coefficient as a result, chemical action makes native particle and micelle particle shape at stable crumb structure, and Behavior of Hardened Cement Paste is then these
Granule coats and connects into firm entirety.With the progress of hydrated reaction of cement, its active constituent is excited modifying agent, generates
Certain gelatinous mass keeps salt marsh soil structure even closer, enhances salinized soil compression strength.
2, salinized soil modified test
2.1 salinized soil are modified raw material
2.1.1 testing raw material:
Soil sample: Yuncheng, Shanxi salinized soil is chosen in this test, is reported according to exploration of geotechnical engineering, SO in the salinized soil of this project place4 -2
Content is 11933.2mg/kg, Cl-1Content 3087.9mg/kg sentences according to " Code for investigation of geotechnical engineering " (GB50021-2001)
The fixed project place salinized soil is medium sulfate salinized soil, has moderate corrosion for the reinforcing bar in concrete and concrete
Property；
Lime: selecting first-class calcareous pulverized limestone, and (CaO+MgO) content is 88%, and non-slaking residue content is 7%, CO2Content is
5%, paste producing amount 2.6L/kg；
Cement: P.O42.5 ordinary portland cement is selected；
Flyash: II grade of fine-ground fly-ash；
Modifying agent: CaO ingredient accounts for 34% -43% in modifying agent.
2.1.2 compaction test is carried out to the salinized soil under variant proportion using compaction process, obtained test result is such as
Shown in table 5.
Each proportioning test of table 5 is modified salt marsh soil pressure reality test result
2.1.3 test material preparation
Sample preparation is carried out according to the resulting each proportion salinized soil maximum dry density of compaction test and optimum moisture content.Test uses three kinds
Size test specimen: cube specimen: 70.7mm × 70.7mm × 70.7mm；Prism test specimen: 40mm × 40mm × 160mm；Cylinder
Body test specimen: φ × h=100mm × 50mm.
Using standard curing, (20 ± 2 DEG C of temperature, 95%) humidity is greater than for test.
2.2 salinized soil modified test schemes
2.2.1 salinized soil is modified conceptual design
The design that a variety of match ratios are carried out using lime+concrete and coal ash+modifying agent carries out physical force to various solidification schemes
Learn the research of performance.
2.2.2 salinized soil study on the modification
The design that a variety of match ratios are carried out using lime, cement, flyash, modifying agent, to the master of various solidification scheme each ages
Performance is wanted to be studied.Each proportion improvement salinized soil test specimen is prepared using punching block and measures its age respectively under the conditions of standard curing
Phase is each improvement salinized soil of 3d, 7d, 14d, 28d, 56d without side resistance to compression limit, the steady coefficient of water and infiltration coefficient, research with
Age growth it is each improvement salinized soil physical and mechanical property changing rule.
1. unconfined compressive strength
The unconfined compressive strength value of modified salinized soil is compared as follows shown in table 6 under the different ratio that the research institute carries out.
The unconfined compressive strength (MPa) of modified salinized soil under 6 different ratio of table, different larval instar
By upper table data and Fig. 3-Fig. 7 it can be seen that adding lime+concrete and coal ash+modifying agent salinized soil pressure resistance
Degree is greatly improved compared to the compression strength for the salinized soil that do not mix, and the compression strength of each test block is with the increasing of age
It grows and increases.When cement+lime+flyash+content of modifier increases, compression strength is improved.
2. water stability
The steady coefficient value of water of modified salinized soil is compared as follows shown in table 7 under the different ratio that the research institute carries out.
It is soaked using test specimen and the ratio between unconfined compressive strength (the water coefficient of stability) characterization improvement salinized soil water that do not soak is steady
It is qualitative, study the water stability of different improvement agent dose modified-salt stain soil.
The steady coefficient value of water of modified salinized soil under 7 different ratio of table
By upper table data and Fig. 8-Figure 12 it can be seen that add lime+concrete and coal ash+modifying agent salinized soil test block with not
The salinized soil test block of admixture is compared, and it is obviously very low not mix lime+steady coefficient of concrete and coal ash+modifying agent salinized soil test block water,
Lime+concrete and coal ash+modifying agent salinized soil test block steady coefficient of water is added in figure is both greater than the salinized soil examination being not spiked with
Block illustrates that adding lime+concrete and coal ash+modifying agent salinized soil water stability is improved, and with the increase of age,
The steady coefficient of water is gradually increasing, and is tested 6 and promoted at most.
3. permeability test
The permeability coefficient of modified salinized soil is compared as follows (MPa) shown in table 8 under the different ratio that the research institute carries out.
The permeability coefficient of modified salinized soil under 8 different ratio of table
It can be seen from upper table data and Figure 13-Figure 17 admixture lime+concrete and coal ash+modifying agent salinized soil test block with
The salinized soil test block being not spiked with is compared, the former infiltration coefficient reduces, and lime+concrete and coal ash+modifying agent salt is added in figure
The infiltration coefficient of stain soil test block is both less than the infiltration coefficient of the salinized soil test block without admixture, illustrates to add lime+concrete and coal ash
The salinized soil anti-permeability performance of+modifying agent is improved, and with the increase of age, infiltration coefficient is gradually decreased.
The analysis of 2.3 data
Above-mentioned test institute measured data is counted, each proportion is by analysis unconfined compressive strength, water stability, infiltration in the case where 56d
Coefficient.According to each horizontal influence to test index of orthogonal test analysis lime factor.
It is reflected in the 1st, 2, No. 3 test by the influence of A1 it can be seen from table, the influence of A2 is reflected in the 4th, 5, No. 6 examination
In testing, the influence of A3 is reflected in the 7th, 8, No. 9 test.
The sum of compressive strength test index corresponding to 1 level of A factor be KA1=y1+y2+y3=8+8.6+11=
27.6, kA1=KA1/3=9.2；
The sum of compressive strength test index corresponding to 2 levels of A factor is KA2=y4+y5+y6=8.9+9.3+10.6=28.8,
kA2=KA2/3=9.6；
The sum of compressive strength test index corresponding to 3 levels of A factor be KA3=y7+y8+y9=9.9+10.5+10.4=
30.8, kA3=KA3/3=10.3.
The very poor R of each factor, R indicate amplitude of variation R=max (k)-of test index of the factor in its value range
Min (k).
By above-mentioned formula, it can show that lime, cement, flyash, modifying agent different ratio are steady to unconfined compressive strength, water
The influence of property, infiltration coefficient etc..
It is obtained as shown in table 9 below according to the very poor formula of orthogonal test:
Table 9
Unconfined compressive strength:
According to the characteristic of orthogonal experiment, KA1, KA2, the KA3 obtained under lime different ratio is different.Illustrate A(lime) level
Variation has an impact to the compression strength of test block, and according to the size of KA1, KA2, KA3 numerical value, show that lime level 3 is lime
The excellent water of factor is flat.
Similarly, B(cement calculated), C(flyash), D(modifying agent) each proportion under K1, K2, K3, obtain
The excellent water of each factor is flat, B(cement) level 3 be cement factor excellent water it is flat, C(flyash) level 3 is flyash factor
Excellent water is flat, D(modifying agent) level 3 be modifying agent factor excellent water it is flat.Then optimum mix proportion is lime 8%, cement 4%, flyash
12%, modifying agent 3%.
Very poor R is bigger, indicates that influence of the horizontal variation of the factor to test index is bigger, factor is more important, by above formula
The visible R:B(cement of table) > A(lime) > D(modifying agent) > C(flyash).It can then obtain cement to salinized soil compression strength
It influences maximum.
Water stability:
According to the characteristic of orthogonal experiment, KA1, KA2, the KA3 obtained under lime different ratio is different.Illustrate A(lime) level
Variation has an impact to the water stability of test block, and according to the size of KA1, KA2, KA3 numerical value, obtain lime level 1 be lime because
The excellent water of element is flat.
Similarly, B(cement calculated), C(flyash), D(modifying agent) each proportion under K1, K2, K3, obtain
The excellent water of each factor is flat, B(cement) level 3 be cement factor excellent water it is flat, C(flyash) level 3 is flyash factor
Excellent water is flat, D(modifying agent) level 2 be modifying agent factor excellent water it is flat.Then optimum mix proportion is lime 8%, cement 4%, flyash
12%, modifying agent 2%.
Very poor R is bigger, indicates that influence of the horizontal variation of the factor to test index is bigger, factor is more important, by above formula
The visible R:B(cement of table) > C(flyash) > A(lime) > D(modifying agent).It can then obtain cement to the shadow of salinized soil water stability
It rings maximum.
Infiltration coefficient:
According to the characteristic of orthogonal experiment, KA1, KA2, the KA3 obtained under lime different ratio is different.Illustrate A(lime) level
Variation has an impact to the water stability of test block, and according to the size of KA1, KA2, KA3 numerical value, obtain lime level 2 be lime because
The excellent water of element is flat.
Similarly, B(cement calculated), C(flyash), D(modifying agent) each proportion under K1, K2, K3, obtain
The excellent water of each factor is flat, B(cement) level 3 be cement factor excellent water it is flat, C(flyash) level 3 is flyash factor
Excellent water is flat, D(modifying agent) level 2 be modifying agent factor excellent water it is flat.Then optimum mix proportion is lime 6%, cement 4%, flyash
12%, modifying agent 2%.
Very poor R is bigger, indicates that influence of the horizontal variation of the factor to test index is bigger, factor is more important, by above formula
The visible R:B(cement of table) > C(flyash) > A(lime) > D(modifying agent).It can then obtain cement to salinized soil infiltration coefficient
It influences maximum.
In conclusion the how many pairs of improvement of salt and alkaline land backfill of cement is critically important, but consider economic function, obtains selection lime
6% -8%, cement 2% -3%, flyash 10% -12%, backfill better performances when modifying agent 2% -3%.
Claims (5)
1. a kind of modification method for backfilling salinized soil, it is characterised in that: improve salt marsh by lime+flyash+cement+modifying agent
Soil carries out a variety of mix-designs using lime, flyash, cement, modifying agent, carries out physical mechanics property to various solidification schemes
Can research, propose intensity be suitable for, the good solidification scheme of durability.
2. the modification method of backfill salinized soil according to claim 1, it is characterised in that specific step is as follows:
(1) prepare test specimen:
1. preparing raw material:
Improve salinized soil use with raw material identical in engineering, lime, cement, flyash are to work as real estate；
2. carrying out compaction test, the soil sample that will be stirred first to the improvement salinized soil under variant proportion using compaction process
It is put into mold, is paved with entire mold, it is long with one cuboid of iron work by taking mold size is 40mm × 40mm × 160mm as an example
Height × width x length of cube size is 55mm × 35mm × 155mm, and iron cuboid is placed on salinized soil, is struck with rubber hammer
It hits, is compacted by first time, mold medium salting soil thickness is original half, by the salinized soil surface spatula of first time compacting
The side road Hua Ji indentation, salinized soil is added into mold again, twice according to the recycling of upper method, that is, completes salinized soil compacting；
It is compacted also make compacting utensil of corresponding size with iron when cylinder test specimen, cube specimen；Then its maximum dry density is measured
And its optimum moisture content；
Make under different ratio the maximum dry density changing rule figure of modified salinized soil and best aqueous respectively according to the data obtained
Quantitative change law figure；
3. test material preparation:
Sample preparation is carried out according to the resulting each proportion salinized soil maximum dry density of compaction test and optimum moisture content；Test uses three kinds
Size test specimen: cube specimen, prism test specimen, cylinder test specimen；
4. test block maintenance:
Test uses standard curing: 20 ± 2 DEG C of temperature, humidity is greater than 95%；
(2) mechanical property test conceptual design
Testing program
This paper proposed adoption orthogonal experiment carries out experimental study, and Orthogonal Experiment and Design is as follows:
The selected factor of the test of table 1
2 test factor of table is horizontal
3 test plan table of table
(3) data are analyzed
According to above-mentioned test institute measured data, experimental result is intuitively analyzed, range analysis；Obtain the different factors and different water
The flat influence to improvement salinized soil physical and mechanical property, selects optimum proportion scheme.
3. the modification method of backfill salinized soil according to claim 2, it is characterised in that: in the raw material: the salt marsh
Soil is medium sulfate salinized soil, has moderate corrosion for the reinforcing bar in concrete and concrete；
Lime: first-class calcareous pulverized limestone is selected；Additional amount is 3%-the 10% of total volume；
Cement: P.O42.5 cement is selected；Additional amount is 0%-the 5% of total volume；
Flyash: II grade of fine-ground fly-ash；Additional amount is 8%-the 15% of total volume；
Modifying agent: additional amount is 0%-the 5% of total volume, and CaO ingredient accounts for 34% -43% in modifying agent.
4. the modification method of backfill salinized soil according to claim 2, it is characterised in that: described during test material preparation
The size of cube specimen are as follows: 70.7mm × 70.7mm × 70.7mm；The size of prism test specimen be 40mm × 40mm ×
160mm；The size of cylinder test specimen are as follows: φ × h=100mm × 50mm.
5. the modification method of backfill salinized soil according to claim 2, it is characterised in that: step (2) physical and mechanical property
In plan design, 9 tests are designed altogether, design five curing ages of 3d, 7d, 14d, 28d, 56d in test every time, each
Age each 3 groups of test specimens are tested every time and prepare 15 groups of test specimens altogether, and every group 10 pieces；Wherein each curing age tests following parameter: nothing
The steady coefficient of confined compressive strength, water and infiltration coefficient；Above-mentioned test totally 1350 pieces of test specimens.
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