CN109696452A - A kind of test method that flyash influences cement-lime solidified earth frost resistance - Google Patents
A kind of test method that flyash influences cement-lime solidified earth frost resistance Download PDFInfo
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- CN109696452A CN109696452A CN201811503975.0A CN201811503975A CN109696452A CN 109696452 A CN109696452 A CN 109696452A CN 201811503975 A CN201811503975 A CN 201811503975A CN 109696452 A CN109696452 A CN 109696452A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0012—Constant speed test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses the test methods that a kind of flyash influences cement-lime solidified earth frost resistance, comprising: is configured to combination curing agent using cement, lime and flyash, is mixed to form solidified earth with silt soil with preset proportion；By the solidified earth static pressure to diameter 39.1mm, height 80mm three petals in, the demoulding of static two hours is sealed with preservative film tight after demoulding, be placed under mark condition after conserving 7d and carried out freezing and thawing test；The solidification soil sample for being up to cycle-index carries out triaxial shear test again.A kind of freeze thawing resistance curing sludge soil provided by the invention and its preparation method, can effectively solve that silt soil precipitation is difficult, poor mechanical property and the problems such as frost resistance, effective use this industrial residue of flyash in the process, environmental pollution is reduced, the purpose of the treatment of wastes with processes of wastes against one another is realized.
Description
Technical field
The present invention relates to frozen soil low-temperature characteristics analysis technical fields, specifically, in particular to a kind of flyash is to cement-
The test method that lime solidified earth frost resistance influences.
Background technique
With the improvement in lake river, the development of waterway dredging dredging engineering, the amount of dredging silt increases sharply.According to related system
It counts, amount of sludge is up to 80,000,000 tons in China river and lake；The Changjiang river siltation amount is huge, and dredging amount reaches 3.2 between 21 years
Hundred million tons；Only the year dredging silt amount in Pearl River Delta area just reaches 8 × 107m3.Mud yield is huge, has seriously affected bed level
And Navigation capacity.It is bound in addition, silt soil carries a variety of pollution impurity if effective measure is not taken to handle these wastes
Meeting land occupation, polluted source cause serious environmental pollution.Flyash is that Coal Resource Development is main useless using what is generated
Object, yield is huge, and long-term stack can occupy a large amount of soils, causes water system and atmosphere pollution, at this stage to the utilization of flyash
Rate only has 35% or so.Thought based on the treatment of wastes with processes of wastes against one another, the flyash that the present invention mixes inequality solidifies in cement-lime to be dredged
In silt soil, to improve the mechanical property and anti-freezing property of silt soil, the purpose that waste resource recovery utilizes is realized.
The research and processing mode that there is now are focused mostly in land throwing, pour into marine and solidified using cement and lime,
Fail effective use soil resource and solves the problems, such as that building lacks soil.And lack to the durability of solidified earth in experimental study process and
The research of anti-freezing property, silt soil moisture content is high, is affected by low temperature, does not avoid some areas from will receive unfreezing
It influences, can effectively expande the process range of sludge solidification technology to the research that curing sludge soil carries out anti-freezing property, make full use of
Silt soil and flyash are to solve engineering problem.
Summary of the invention
In order to solve problems in the prior art, the embodiment of the invention provides a kind of flyash to cement-lime solidified earth
The test method that frost resistance influences.The technical solution is as follows:
On the one hand, a kind of test method that flyash influences cement-lime solidified earth frost resistance is provided, comprising:
It is configured to combination curing agent using cement, lime and flyash, is mixed to form admittedly with preset proportion with silt soil
Change soil；
By the solidified earth static pressure to diameter 39.1mm, height 80mm three petals in, the demoulding of static two hours takes off
It is sealed tightly after mould with preservative film, is placed under mark condition after conserving 7d and carries out freezing and thawing test；It is up to the solidification of cycle-index
Soil sample carries out triaxial shear test again.
Further, the specific proportion of the combination curing agent are as follows: cement mixing content: 6%；Lime intermingled quantity 9%；Flyash:
0%, 5%, 10%, 15%, 20%；
Further, the freezing and thawing test specifically:
Freeze 12h in cryogenic box, the temperature of the cryogenic box is -20 DEG C；Melt 12h, the insulating box in insulating box
Temperature be 20 ± 2 DEG C, amount to for 24 hours, this be 1 Frozen-thawed cycled；
Wherein, 5 groups of samples, every group of sample carry out 6 groups of circulations；Every group of cycle-index is successively are as follows: 0,1,3,6,9,12.
Further, the solidified earth Frozen-thawed cycled carries out under sealing condition, and the solidified earth is adopted after being made
With sealing after plastic film tight, to prevent scattering and disappearing and extraneous supply for sample moisture, closed system is simulated.
Technical solution provided in an embodiment of the present invention has the benefit that
The test method that a kind of flyash provided by the invention influences cement-lime solidified earth frost resistance, in no moisturizing
In the case of start carry out solidification sludge freezing and thawing test, first progress freezing test, environment temperature be -20 DEG C, then into
Row melts test, and environment temperature is 20 DEG C.To guarantee that sample freezes and melts completely, this time test frost and thawing time are all provided with
It is set to 12h, a Frozen-thawed cycled period is for 24 hours.Frozen-thaw process is repeated, the sample for being up to design number of freezing and thawing, which takes out, carries out three
Shaft experiment, remaining continues Frozen-thawed cycled.Triaxial test using the full-automatic triaxial apparatus of TSZ to reach the sample of number of freezing and thawing into
It is capable not thus knot do not drain (UU) test.Confining pressure takes 100,200,300kPa respectively, and axially loaded rate is 0.8mm/min, control
Strain is 20%.
Meanwhile there are also progress below by the present invention:
1, method for making sample using static pressure into three petals, be more nearly Practical Project, avoid weak soil be difficult to hit it is real and broken
The drawbacks of bad solidified earth initial setting strength；
2, sample strictly seals when Frozen-thawed cycled, and the of no help regimen condition in frozen-thaw process, frost heave temperature is lower, absolute guarantee
Freeze effect；
3, further solidified earth is handled using flyash, can be effectively absorbed water, reduce moisture content, enhance the soil body
Can, soil sample hole can be also reduced, the structural of sample is enhanced, improves freezing tolerance.
Test discloses different solidify under Frozen-thawed cycled and matches lower soil strength with the change rule of number of freezing and thawing.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 a is stress-of the SD15FA sample (confining pressure 200kPa) of the embodiment of the present invention under different freezing-thawing cycles
Strain stress relation figure；
Fig. 1 b is SD10FA sample (non-freeze thawing and 9 Frozen-thawed cycleds) answering under different confining pressures of the embodiment of the present invention
Power-strain stress relation figure；
Fig. 2 a is influence schematic diagram of the confining pressure of the embodiment of the present invention to solidified earth breakdown strength；
The relational graph of sample breakdown strength and number of freezing and thawing when Fig. 2 b is the confining pressure 100kPa of the embodiment of the present invention；
The relational graph of sample breakdown strength and number of freezing and thawing when Fig. 2 c is the confining pressure 200kPa of the embodiment of the present invention；
The relational graph of sample breakdown strength and number of freezing and thawing when Fig. 2 d is the confining pressure 300kPa of the embodiment of the present invention；
Fig. 3 a is the sample freezing-thawing cycles and cohesive strength relational graph of the embodiment of the present invention；
Fig. 3 b is the sample freezing-thawing cycles and internal friction angle relational graph of the embodiment of the present invention；
Fig. 4 a is porous media feature schematic diagram after freeze thawing 1 time of the embodiment of the present invention；
Fig. 4 b is porous media feature schematic diagram after freeze thawing 9 times of the embodiment of the present invention；
Fig. 4 c is the SD sample water-cut variation process schematic of the embodiment of the present invention；
Fig. 4 d is the SD15FA sample water-cut variation process schematic of the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
The present invention provides the test methods that a kind of flyash influences cement-lime solidified earth frost resistance, comprising:
It is configured to combination curing agent using cement, lime and flyash, is mixed to form admittedly with preset proportion with silt soil
Change soil；
By the solidified earth static pressure to diameter 39.1mm, height 80mm three petals in, the demoulding of static two hours takes off
It is sealed tightly after mould with preservative film, is placed under mark condition after conserving 7d and carries out freezing and thawing test；It is up to the solidification of cycle-index
Soil sample carries out triaxial shear test again.
Specifically, the solidified earth Frozen-thawed cycled carries out under sealing condition, and the solidified earth is all made of after being made
It is sealed after plastic film tight, to prevent scattering and disappearing and extraneous supply for sample moisture, simulates closed system.
In the present embodiment, by providing a kind of test method that flyash influences cement-lime solidified earth frost resistance, have
The industrial residue flyash with pollution is utilized in effect, realizes the purpose of the treatment of wastes with processes of wastes against one another.
Further, the specific proportion of the combination curing agent are as follows: cement mixing content: 6%；Lime intermingled quantity 9%；Flyash:
0%, 5%, 10%, 15%, 20%；
Further, the freezing and thawing test specifically:
Freeze 12h in cryogenic box, the temperature of the cryogenic box is -20 DEG C；Melt 12h, the insulating box in insulating box
Temperature be 20 ± 2 DEG C, amount to for 24 hours, this be 1 Frozen-thawed cycled；
Wherein, 5 groups of samples, every group of sample carry out 6 groups of circulations；Every group of cycle-index is successively are as follows: 0,1,3,6,9,12.
In the present embodiment, testing program specifically:
(1) it is related to testing:
The physical index research of soil；Triaxial test (non-fixation and non-drainage shear), freezing and thawing test, water translocation test.
(2) curing agent matches:
Using cement (Cement), lime (Lime) and flyash (Fly ash) with the mixing of reasonable proportion, it is configured to join
Close curing agent.Influence of the main research flyash to cement-lime solidified earth anti-freezing property herein.That is cement mixing content: 6%；Stone
Grey volume 9%；Flyash: 0%, 5%, 10%, 15%, 20%.Setting mixing cooperation such as table 1.
1 solidified earth Mixture Ratio of table
| Specimen coding | Silt soil dry weight/% | Cement/% | Lime/% | Flyash/% |
| SD | 85 | 6 | 9 | 0 |
| SD5FA | 80 | 6 | 9 | 5 |
| SD10FA | 75 | 6 | 9 | 10 |
| SD15FA | 70 | 6 | 9 | 15 |
| SD20FA | 65 | 6 | 9 | 20 |
Note: data use quality very in table, and SD is the soil sample that cement 6% and lime intermingled quantity 9% divide, on this basis
The volume for changing flyash is further modified curing sludge soil.
(3) freezing and thawing test designs
Cycle-index: 01369 12 (totally 6 groups)
Freeze thawing: -20 DEG C of cryogenic box, freeze 12h；20 ± 2 DEG C of insulating box, melt 12h.Amount to for 24 hours, this is 1 Frozen-thawed cycled.
5 groups of samples, every group of sample carry out 6 groups of circulations.
Earth material: Hunan Province river training of channel silt soil.
Sample Frozen-thawed cycled carries out under sealing condition, and sample seals after being all made of plastic film tight after being made,
To prevent scattering and disappearing and extraneous supply for sample moisture, closed system is simulated.
(4) triaxial test experimental design
Test method: unconsolidated-undrained triaxial test (UU)
Confining pressure: (axially loaded rate is 0.4mm/min, controlled strain 20% by 100kPa, 200kPa, 300kPa.)
Sample preparation: by solidified earth static pressure to diameter 39.1mm, height 80mm three petals in, the demoulding of static two hours takes off
It is sealed tightly after mould with preservative film, is placed under mark condition after conserving 7d and carries out freezing-thawing test, the sample for being up to cycle-index carries out
Triaxial shear test.
Variable: confining pressure, number of freezing and thawing, doping quantity of fly ash, radial distance.
In the present embodiment, controlling test index is shown in Table 2, and curing sludge soil stress strain stress relation is shown in Fig. 1, and breakdown strength is shown in figure
2, Shear Strength Index is shown in Fig. 3, and Fig. 4 is shown in water translocation；
2 controlling test index of table
Specifically, the stress-strain relation that Fig. 1 is confining pressure when being 200 under difference freezing-thawing cycles, referring specifically to Fig. 1 a
With Fig. 1 b；By Fig. 1 it can be concluded that following rule:
1, flyash can effectively improve the intensity of solidified earth；
2, sample freezing tolerance increased after mixing flyash, and the ability for resisting freeze thawing increased.
Meanwhile Fig. 2 is the relationship of sample breakdown strength and confining pressure and freezing-thawing cycles, is specifically shown in Fig. 2 a, Fig. 2 b, figure
2c, Fig. 2 d.
Fig. 3 is test Shear Strength Index with freezing-thawing cycles relational graph, is specifically shown in Fig. 3 a, Fig. 3 b.
Fig. 4 is the moisture redistribution of sample under different number of freezing and thawing, is specifically shown in Fig. 4 a, Fig. 4 b, Fig. 4 c, Fig. 4 d.Annotation: right
In the sample of strain hardening type, then take deviatoric stress value corresponding to axial strain 15% as breakdown strength.By data it is found that with
The change of parameter, solidified earth breakdown strength increased, but be not linearly to change；Intensity is dropped under Frozen-thawed cycled effect
It is low, in first big after small trend.Conclusion, reasonable curing ratio have certain frost resistance.
In the present embodiment, silt soil fundamental property is additionally provided, test mud is derived from Hunan Province's training of channel engineering, becomes silted up
For the natural moisture content of soil 105% or so, property is poor, belongs to high liquid limit clay, specific basic physical property index such as 3 institute of table
Show.It after river bottom mud is dug out, is put into polyethylene plastic bag is sent into laboratory at once, carry out basic physical index measurement.For section
About curing materials and guarantee the solidification effect of silt soil, mud soil sample moisture content is air-dried to 70%, then carry out solidity test.
3 dredging silt physical property index of table
| ω0/ % | ρ/(g/cm3) | ds | wl/ % | wp/ % | ωc/ % |
| 105 | 1.45 | 2.54 | 47 | 27 | 3.9 |
Note: ωcFor the content of organic matter.
Technical solution provided in an embodiment of the present invention has the benefit that
The test method that a kind of flyash provided by the invention influences cement-lime solidified earth frost resistance, in no moisturizing
In the case of start carry out solidification sludge freezing and thawing test, first progress freezing test, environment temperature be -20 DEG C, then into
Row melts test, and environment temperature is 20 DEG C.To guarantee that sample freezes and melts completely, this time test frost and thawing time are all provided with
It is set to 12h, a Frozen-thawed cycled period is for 24 hours.Frozen-thaw process is repeated, the sample for being up to design number of freezing and thawing, which takes out, carries out three
Shaft experiment, remaining continues Frozen-thawed cycled.Triaxial test using the full-automatic triaxial apparatus of TSZ to reach the sample of number of freezing and thawing into
It is capable not thus knot do not drain (UU) test.Confining pressure takes 100,200,300kPa respectively, and axially loaded rate is 0.8mm/min, control
Strain is 20%.
Meanwhile there are also progress below by the present invention:
4, method for making sample using static pressure into three petals, be more nearly Practical Project, avoid weak soil be difficult to hit it is real and broken
The drawbacks of bad solidified earth initial setting strength；
5, sample strictly seals when Frozen-thawed cycled, and the of no help regimen condition in frozen-thaw process, frost heave temperature is lower, absolute guarantee
Freeze effect；
6, further solidified earth is handled using flyash, can be effectively absorbed water, reduce moisture content, enhance the soil body
Can, soil sample hole can be also reduced, the structural of sample is enhanced, improves freezing tolerance.
Test discloses different solidify under Frozen-thawed cycled and matches lower soil strength with the change rule of number of freezing and thawing.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, all in the spirit and principles in the present invention
Within, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (4)
1. the test method that a kind of flyash influences cement-lime solidified earth frost resistance characterized by comprising
It is configured to combination curing agent using cement, lime and flyash, solidified earth is mixed to form with silt soil with preset proportion；
By the solidified earth static pressure to diameter 39.1mm, height 80mm three petals in, static two hours demoulding, after demoulding
It is tight with preservative film sealing, it is placed under mark condition after conserving 7d and carries out freezing and thawing test；It is up to the solidification soil sample of cycle-index
Triaxial shear test is carried out again.
2. the method as described in claim 1, which is characterized in that the specific proportion of the combination curing agent are as follows: cement mixing content:
6%；Lime intermingled quantity 9%；Flyash: 0%, 5%, 10%, 15%, 20%.
3. the method as described in claim 1, which is characterized in that the freezing and thawing test specifically:
Freeze 12h in cryogenic box, the temperature of the cryogenic box is -20 DEG C；Melt 12h, the temperature of the insulating box in insulating box
Degree is 20 ± 2 DEG C, is amounted to for 24 hours, this is 1 Frozen-thawed cycled；
Wherein, 5 groups of samples, every group of sample carry out 6 groups of circulations；Every group of cycle-index is successively are as follows: 0,1,3,6,9,12.
4. the method as described in claim 1, which is characterized in that the solidified earth Frozen-thawed cycled carries out under sealing condition,
The solidified earth seals after being all made of plastic film tight after being made, to prevent scattering and disappearing for sample moisture from mending with extraneous
It gives, simulates closed system.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111562289A (en) * | 2020-07-08 | 2020-08-21 | 中建四局第三建设有限公司 | In-situ testing method for sludge solidification |
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