CN110108534A - A kind of high permeability resistant basalt fiber cement soil and preparation method thereof - Google Patents
A kind of high permeability resistant basalt fiber cement soil and preparation method thereof Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 146
- 239000004568 cement Substances 0.000 title claims abstract description 126
- 229920002748 Basalt fiber Polymers 0.000 title claims abstract description 62
- 230000035699 permeability Effects 0.000 title claims abstract description 40
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000001764 infiltration Methods 0.000 claims description 44
- 230000008595 infiltration Effects 0.000 claims description 44
- 238000012360 testing method Methods 0.000 claims description 29
- 239000011083 cement mortar Substances 0.000 claims description 9
- 238000004080 punching Methods 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 239000004575 stone Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 235000013399 edible fruits Nutrition 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 238000010348 incorporation Methods 0.000 abstract description 7
- 238000011161 development Methods 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract 1
- 230000003487 anti-permeability effect Effects 0.000 description 7
- 238000006703 hydration reaction Methods 0.000 description 6
- 230000009467 reduction Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000002708 enhancing effect Effects 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000036314 physical performance Effects 0.000 description 2
- 238000000611 regression analysis Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009440 infrastructure construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- General Physics & Mathematics (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (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 a kind of high permeability resistant basalt fiber cement soil and preparation method thereof, and wherein according to parts by weight, primary raw material includes: 1000 parts of soil sample, 365 parts of water, 15 parts of cement, 15 parts of basalt fibre to high permeability resistant basalt fiber cement soil；Wherein, cement soil's water content is configured by the natural moisture content 57.5% of undisturbed soil；Basalt fibre is calculated by incorporation 1.5%；Cement mixed ratio is set as 1.5% and is calculated；Ratio of mud setting is calculated by 0.5；The proportion that the present invention passes through optimization basalt fibre, in the case where guaranteeing that soil cement has works fine, effectively increase the permeability of soil cement, obtained soil cement is suitable for underground structure water-stop curtain and foundation pit seepage control project rich in underground water, economic loss is greatly reduced, promotes the development of industry significantly.
Description
Technical field:
The invention belongs to soil cement preparation fields, and in particular to a kind of high permeability resistant basalt fiber cement is native and its prepares
Method.
Background technique:
It is growing for the investment of infrastructure construction with the fast development of urban modernization.One kind is found both may be used
Just become development trend more and more important in engineering construction to reduce the construction material that cost can economize on resources again.Soil cement with
By means of its high intensity, low compressibility, low-permeability, economy, environmental protection and the easily excellent engineering property such as construction in engineering construction
In achieve more significant practice effect, especially in terms of sealing antiseepage application it is also more and more extensive.
The permeability of soil cement is that the basic mechanical performance of same soil cement is the same, and evaluates the one of soil cement engineering property
A important index.So-called permeability just refers to the ability penetrated by liquid, for soil cement, just refers to that liquid penetrates soil cement
The ability of middle pellet pores.Therefore, the quality of soil cement permeance property is heavily dependent on the viscous of soil particle in soil cement
Situation is tied, and the cohesive force of soil particle and the degree of hydration of cement are closely bound up.So cement mixing content and curing age are shadows
An important factor for Xiangshui County's soil permeance property.In addition to this, influence the factor of soil cement permeance property also: undisturbed soil it is big
Small, gradation, shape, porosity and various outer-penetrating agents etc..
Soil cement relies on the advantages of its low-permeability to be widely used in practical projects, especially on ground
The application in terms of soil cement cut-off wall in lower engineering.And currently, the research for soil cement permeance property is also less, especially
In the case where incorporation basalt fibre.The application will mix the basalt fibre of different addition quantity in soil cement, to grind
Study carefully the influence of basalt fibre volume, curing age to soil cement permeance property, and basalt fibre is gone out according to fitting experimental data
The relational expression for tieing up volume, curing age and permeability coefficient of cement soil, provides reference for Practical Project.
Summary of the invention:
It is an object of the invention in view of the shortcomings of the prior art, provide a kind of high permeability resistant basalt fiber cement soil and its
Preparation method.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of high permeability resistant basalt fiber cement soil of disclosure of the invention, according to parts by weight, the soil cement it is main
Raw material includes: 1000 parts of soil sample, 300-400 parts of water, 9-21 parts of cement, 9-15 parts of basalt fibre；
According to parts by weight, preferred component: 1000 parts of soil sample, 365 parts of water, 15 parts of cement, 15 parts of basalt fibre；
Wherein, cement soil's water content is configured by the natural moisture content 57.5% of undisturbed soil；Basalt fibre is pressed
Incorporation 1.5% is calculated；Cement mixed ratio is set as 1.5% and is calculated；Ratio of mud setting is calculated by 0.5.
The cement is 42.5 ordinary portland cements.
The soil sample is muck soil.
The preparation method of high permeability resistant basalt fiber cement soil as described above, specifically includes the following steps:
(1) after drying undisturbed soil, then soil sample crushed, so that soil sample is crossed 2mm sieve, obtains spare soil sample.
(2) a certain amount of soil sample and water are weighed, the two is put into cement mortar mixer and is stirred until homogeneous.
(3) suitable basalt fibre is weighed by match ratio again, is added in the wet soil of (2) and is stirred until homogeneous.
(4) suitable cement and water are weighed, cement mortar mixer is put into and stirs evenly, be made into cement slurry.
(5) cement slurry prepared in (4) is poured into the soil sample of (3), and be stirred until homogeneous.
(6) soil cement being stirred in (5) is fitted into three gang moulds, in cement mortar plain bumper jolt ramming.
(7) after jolt ramming is complete, the extra soil in die trial upper surface is smoothed out.
(8) after soil cement is packed into the molding of three gang moulds, standard curing room maintenance is put it into immediately for 24 hours.
(9) after maintenance for 24 hours, sample is taken out into demoulding and is conserved again to corresponding age, the preparation of cement soil sample is completed.
The beneficial effects of the present invention are: the present invention limits the Black Warrior by adding basalt fibre in soil cement
The doping of rock fiber is the 1.5% of cement-stabilized soil sample total amount, under this volume, is guaranteeing soil cement with works fine
In the case of, the infiltration coefficient of soil cement is effectively reduced, obtained soil cement is suitable for the underground structure sealing rich in underground water
Curtain and foundation pit seepage control project, greatly reduce economic loss, promote the development of industry significantly.
Detailed description of the invention:
Fig. 1 is influence of the basalt fibre volume to permeability coefficient of cement soil；
Fig. 2 is the matched curve of Sample A infiltration coefficient and age；
Fig. 3 is the matched curve of sample B infiltration coefficient and curing age；
Fig. 4 is the matched curve of sample C infiltration coefficient and curing age；
Fig. 5 is the matched curve of sample D infiltration coefficient and curing age；
Specific embodiment:
Below in conjunction with specific embodiment, the present invention will be further described, but the present invention is not limited only to these embodiments.
A kind of high permeability resistant basalt fiber cement soil, according to parts by weight, primary raw material include: 1000 parts of soil sample,
365 parts of water, 15 parts of cement, 15 parts of basalt fibre；Wherein, cement soil's water content presses the natural moisture content 57.5% of undisturbed soil
It is configured；Basalt fibre is calculated by different incorporations；Cement mixed ratio is set as 1.5% and is calculated；The ratio of mud
Setting is calculated by 0.5.
The preparation method of the high permeability resistant basalt fiber cement soil, specifically includes the following steps:
(1) after drying undisturbed soil, then soil sample crushed, so that soil sample is crossed 2mm sieve, obtains spare soil sample.
(2) a certain amount of soil sample and water are weighed, the two is put into cement mortar mixer and is stirred until homogeneous.
(3) suitable basalt fibre is weighed by match ratio again, is added in the wet soil of (2) and is stirred until homogeneous.
(4) suitable cement and water are weighed, cement mortar mixer is put into and stirs evenly, be made into cement slurry.
(5) cement slurry prepared in (4) is poured into the soil sample of (3), and be stirred until homogeneous.
(6) soil cement being stirred in (5) is fitted into three gang moulds, in cement mortar plain bumper jolt ramming.
(7) after jolt ramming is complete, the extra soil in die trial upper surface is smoothed out.
(8) after soil cement is packed into the molding of three gang moulds, standard curing room maintenance is put it into immediately for 24 hours.
(9) after maintenance for 24 hours, sample is taken out into demoulding and is conserved again to corresponding age, the preparation of cement soil sample is completed.
In the present embodiment, the 42.5 normal silicate water produced using Fujian Province Jianyang conch cement Co., Ltd
Mud, indices all meet " common portland cement " (GB175-2007) requirement.
The basalt fibre is the basalt fibre of Zhejiang Shijin Basalt Fiber Co., Ltd's production, Main physical
Performance indicator is shown in Table 1.
The soil sample is the muck soil in certain housing for survivor whose foundation pit near Fuzhou Railway Station qin pavilion overpass.
Its Main physical performance indicator is shown in Table 2.
The physical and mechanical property indexs of 1 basalt fibre of table
The basic physical mechanical property index of 2 soil sample of table
One, basalt fiber cement soil permeability is tested
The main purpose of this test is to study the influence to soil cement permeance property of basalt fibre volume, age, and root
The relational expression of basalt fibre volume, age and permeability coefficient of cement soil is set up according to experimental data.This test uses TJSS-25
Type soil cement infiltration experiment device has made three samples for every kind of match ratio, carries out three groups of parallel tests, cement respectively
Results are averaged for native infiltration coefficient, and specific mix-design is shown in Table 3.
Profound-military rock cement-soil with fiber permeability test mix-design of table 3
Test procedure:
(1) filter paper and permeable stone are successively put in the lower mouth of the cement soil sample and punching block that have sealed, and make permeable stone with
Punching block bottom flushes, then punching block is installed on permeability apparatus to (cement soil sample is in a circular table shape, is placed on the slot of punching block again
In mouthful, due to must assure that water passes through out of hole inside sample under the action of osmotic pressure, test just can ensure that in this way
Accuracy, this test carried out between the periphery wall and punching block notch internal perisporium of basalt fiber cement soil sample using paraffin
Sealing).
(2) power supply for connecting permeability apparatus, because soil cement need to carry out permeability test and soil cement under constant water pressure
Intensity itself is lower, therefore adjusts pressure to 0.2MPa.
(3) it after having adjusted water pressure, closes water discharging valve and opens pressure valve, start to test.
It (4), can water outlet in start recording time period t when cement soil sample begins with the more uniform exudation of water
Q is measured, and to measure water temperature simultaneously.Sample moisture is sucked into graduated cylinder using buret and is read out water yield Q.Reading when
Between between will be depending on the size according to water percolating capacity, biggish for water percolating capacity sample needs 10~30min reading primary, for seeping
Relatively small 0.5~2h of the sample reading of water is once.
(5) when the water percolating capacity of cement soil sample is smaller and stablizes, can terminate to test.
Test result processing:
(1) formula can be obtained according to Darcy's law and (2) formula is as follows:
According to (1) formula and (2) Shi Ke get, the infiltration coefficient of the soil cement when water temperature is T DEG C is as shown in (3) formula:
kTThe infiltration coefficient of soil cement, cm/s when for water temperature T DEG C；
Q is the water percolating capacity in the t period, cm3；
A is the sectional area in the middle part of sample, cm2；
T is time interval, s；
I is hydraulic gradient, dimensionless；
P is osmotic pressure, MPa；
H is specimen height, cm；
γwFor the severe of water, 0.0098N/cm is taken3。
The normal temperature of soil cement permeability test is 20 DEG C, the infiltration coefficient at T DEG C is modified to standard according to (4) formula
Infiltration coefficient at 20 DEG C of temperature.The power coefficient of viscosity of water should meet national standard " Standard for test methods of earthworks " GB/T50123-
The relevant regulations of 1999 (2008).
k20The infiltration coefficient of soil cement, cm/s when for water temperature being 20 DEG C of normal temperature；
ηTThe power coefficient of viscosity of water, kPas when for water temperature T DEG C；
η20The power coefficient of viscosity of water, kPas when being 20 DEG C of water temperature.
After the test data of each sample is calculated and corrected, the infiltration coefficient of different mixture ratio can be obtained, have
Body the results are shown in Table 4.
The infiltration coefficient of table 4 basalt fiber cement soil
Two, test result
According to the test result of table 4, the relation curve that permeability coefficient of cement soil changes with profound age is depicted, such as Fig. 1 institute
Show.
As shown in Figure 1, though the volume of basalt fibre be it is how many, the infiltration coefficient of soil cement is all with curing age
Increase and reduces.In early stage, the slope of curve is steeper, illustrates the fast of infiltration coefficient decline, the impermeability of soil cement enhances rapidly；
And to the later period, curve slowly slows down, and illustrates that infiltration coefficient fall off rate is slack-off, the reinforcing effect of soil cement anti-permeability performance is
Slow down.Why such case will cause, it is mainly related with the hydration reaction of cement and firmly solidifying reaction, in the water of cement early period
Change and hard solidifying reaction be rapider, thus infiltration coefficient just reduce it is fast；And to the later period, with hydration reaction it is continuous into
Row, hydration rate reduce, so that the amplitude for causing infiltration coefficient reduction reduces.
The relational expression of infiltration coefficient and curing age:
The hydration reaction of soil cement usually requires 90d age Shi Caihui fully reacting, therefore soil cement anti-permeability performance
Humidification can just terminate when being also required to 90d age.But in practical projects, it is contemplated that economic benefit and construction in later period
Problem will not just carry out the detection of soil cement anti-permeability performance until 90d age.Therefore, get up early age and 90d just be must be set up
Functional relation between age infiltration coefficient, so that it may when extrapolating 90d age by the infiltration coefficient of early age according to relational expression
Infiltration coefficient, provide certain reference value so as to the prediction to soil cement anti-permeability performance.
This section will establish respectively the power of curing age and infiltration coefficient under different basalt fibre volumes according to test data
Function regression model[89]。
(1) when basalt fibre volume is 0, as shown in Fig. 2, the curvilinear equation that infiltration coefficient changes with curing age can be obtained
It is shown below:
kA=18.9258t-0.2199 (R2=0.9898)
(2) when basalt fibre volume is 0.5%, as shown in figure 3, the curve that infiltration coefficient changes with curing age can be obtained
Equation is shown below:
kB=16.1601t-0.2307 (R2=0.9793)
(3) when basalt fibre volume is 1.0%, as shown in figure 4, the curve that infiltration coefficient changes with curing age can be obtained
Equation is shown below:
kC=13.5579t-0.2330 (R2=0.9469)
(4) when basalt fibre volume is 1.5%, as shown in figure 5, the curve that infiltration coefficient changes with curing age can be obtained
Equation is shown below:
kD=14.4520t-0.2880 (R2=0.9552)
The application has mainly carried out permeability test to the soil cement of different basalt fibre volumes and different curing ages,
The influence of basalt fibre volume and age to soil cement permeance property is had studied, its penetration mechanism is carried out by test result
Analysis, is concluded that
(1) incorporation of basalt fibre has more significant reduction to act on the infiltration coefficient of soil cement, with basalt
The increase of fibers content, permeability coefficient of cement soil gradually decrease, the anti-permeability performance enhancing of soil cement, but the amplitude meeting of its enhancing
Slowed down with the increase of volume.Therefore in the research range of this chapter, the optimum mix amount of basalt fibre is 1.5%.
(2) with the growth of curing age, the infiltration coefficient of soil cement can also decline.In early age, under infiltration coefficient
The rate of drop is very fast, and after having arrived 60d age, and with the reduction of hydrated cementitious rate, the fall off rate of infiltration coefficient is also therewith
It is slack-off.
(3) according to test data, respectively the permeability coefficient of cement soil to different curing ages and basalt fibre volume into
It has gone regression analysis, has obtained the quadratic polynomial matched curve of infiltration coefficient Yu basalt fibre volume.
(4) according to test data, respectively the permeability coefficient of cement soil to different basalt fibre volumes and curing age into
It has gone regression analysis, has obtained the power function fitting curve of infiltration coefficient and curing age.
It summarizes: (1) influence of the basalt fibre volume to infiltration coefficient
Basalt fibre incorporation will generate certain influence to the permeability of soil cement, thus this test measured it is different profound
The infiltration coefficient of soil cement when military rock fibers content.It can be obtained by test result, the infiltration of the incorporation of basalt fibre for soil cement
Saturating coefficient has more significant reduction effect, and with the increase of basalt fibre volume, permeability coefficient of cement soil is gradually decreased, cement
The anti-permeability performance enhancing of soil, but the amplitude of its enhancing can be slowed down with the increase of volume.Therefore in the research of this chapter
In range, the optimum mix amount of basalt fibre is 1.5%.
(2) influence of the age to permeability coefficient
The hydration reaction of soil cement usually requires 90d age Shi Caihui fully reacting, therefore soil cement anti-permeability performance
Humidification can just terminate when being also required to 90d age.With the growth of curing age, the infiltration coefficient of soil cement is also under meeting
Drop.In early age, the rate of infiltration coefficient decline is very fast, and after having arrived 60d age, with the reduction of hydrated cementitious rate,
The fall off rate of infiltration coefficient is also slack-off therewith.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, is all covered by the present invention.
Claims (6)
1. a kind of high permeability resistant basalt fiber cement soil, it is characterised in that: according to parts by weight, the main original of the soil cement
Material includes: 1000 parts of soil sample, 300-400 parts of water, 9-21 parts of cement, 9-15 parts of basalt fibre.
2. high permeability resistant basalt fiber cement soil according to claim 1, it is characterised in that: 1000 parts of the soil sample,
365 parts of water, 15 parts of cement, 15 parts of basalt fibre.
3. high permeability resistant basalt fiber cement according to claim 1 or 2 soil, it is characterised in that: the cement is
42.5 ordinary portland cements.
4. high permeability resistant basalt fiber cement soil according to claim 1 or 2, it is characterised in that: the soil sample is to become silted up
Shale soil.
5. a kind of method for preparing high permeability resistant basalt fiber cement soil as described in claim 1, it is characterised in that: specific
The following steps are included:
(1) after drying undisturbed soil, then soil sample crushed, so that soil sample is crossed 2mm sieve, obtains spare soil sample；
(2) a certain amount of soil sample and water are weighed, the two is put into cement mortar mixer and is stirred until homogeneous；
(3) suitable basalt fibre is weighed by match ratio again, is added in the wet soil of (2) and is stirred until homogeneous；
(4) suitable cement and water are weighed, cement mortar mixer is put into and stirs evenly, be made into cement slurry；
(5) cement slurry prepared in (4) is poured into the soil sample of (3), and be stirred until homogeneous, mixing time should at least 5min；
(6) soil cement being stirred in (5) is fitted into three gang moulds, the jolt ramming on cement mortar plain bumper；
(7) after jolt ramming is complete, the extra soil in die trial upper surface is smoothed out；
(8) after soil cement is packed into the molding of three gang moulds, standard curing room maintenance is put it into immediately for 24 hours；
(9) after maintenance for 24 hours, sample is taken out into demoulding and is conserved again to corresponding age, the preparation of cement soil sample is completed.
6. a kind of method for testing high permeability resistant basalt fiber cement soil as described in claim 1, it is characterised in that: test
Step:
(1) filter paper and permeable stone are successively put in the lower mouth of the cement soil sample and punching block that have sealed, and makes permeable stone and punching block
Bottom flushes, and then punching block is installed on permeability apparatus again；
(2) power supply for connecting permeability apparatus, because soil cement need to carry out permeability test and soil cement itself under constant water pressure
Intensity is lower, therefore adjusts pressure to 0.2Mpa；
(3) it after having adjusted water pressure, closes water discharging valve and opens pressure valve, start to test；
(4) when cement soil sample is when showing to begin with the more uniform exudation of water, can go out in start recording time period t
Water Q, and water temperature is measured simultaneously, it is sucked into graduated cylinder using the moisture that buret shows sample and is read out water yield Q,
Will be depending on the size according to water percolating capacity between the time of reading, sample biggish for water percolating capacity needs 10~30min reading one
Secondary, 0.5~2h of sample reading relatively small for water percolating capacity is once；
(5) when the water percolating capacity that cement soil sample shows is smaller and stablizes, can terminate to test；
Test result processing:
(1) formula can be obtained according to Darcy's law and (2) formula is as follows:
According to (1) formula and (2) Shi Ke get, the infiltration coefficient of the soil cement when water temperature is T DEG C is as shown in (3) formula:
The normal temperature of soil cement permeability test is 20 DEG C, the infiltration coefficient at T DEG C is modified to normal temperature according to (4) formula
Infiltration coefficient at 20 DEG C, the power coefficient of viscosity of water should meet national standard " Standard for test methods of earthworks " GB/T50123-1999
(2008) relevant regulations；
After the test data of each sample is calculated and corrected, the infiltration coefficient of different mixture ratio can be obtained, it is specific to tie
Fruit see the table below:
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113605381A (en) * | 2021-07-26 | 2021-11-05 | 城地建设集团有限公司 | Polypropylene fiber reinforced cement soil mixing pile and construction process thereof |
| CN114773005A (en) * | 2022-05-10 | 2022-07-22 | 城地建设集团有限公司 | Basalt fiber reinforced solidified cement soil and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923995A (en) * | 2012-08-21 | 2013-02-13 | 内蒙古农业大学 | Fiber-cement composite soil |
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