CN103214224A - Compound stabilizing method for silty soil in Yellow River flooded areas - Google Patents
Compound stabilizing method for silty soil in Yellow River flooded areas Download PDFInfo
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- CN103214224A CN103214224A CN2013101339028A CN201310133902A CN103214224A CN 103214224 A CN103214224 A CN 103214224A CN 2013101339028 A CN2013101339028 A CN 2013101339028A CN 201310133902 A CN201310133902 A CN 201310133902A CN 103214224 A CN103214224 A CN 103214224A
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Abstract
The invention discloses a compound stabilizing method for silty soil in Yellow River flooded areas and belongs to the technical field of road construction materials and road building. The method can be realized through reasonable mix proportion of a sodium methyl silicate aqueous solution, polyacrylamide, pulverized coal, lime and silty soil. According to the method, not only can the cost be lowered, but also the non-laterally confined compressive strength and anti-penetrability performance of the silty soil can be improved. In addition, the method also has the advantages that the functions of resisting capillary water and preventing rise of the capillary water can be achieved, and the stability property of the water can be enhanced so as to prevent the damage of roadbed and road surfaces; and the maintenance cost can be lowered, the road service life can be prolonged, and the like.
Description
Technical field
The present invention relates to a kind of novel method that is used to improve, improve areas formerly flooded by the Huanghe River silt performance, belong to pavement construction material and road performance technical field.
Background technology
The areas formerly flooded by the Huanghe River silt is the distinctive a kind of soil property in two sides, the Yellow River and surrounding area, and it is loose to have quality, easily moisture absorption, characteristics such as plasticity index is low, perviousness is better.The areas formerly flooded by the Huanghe River silt belongs to and contains the sand silt, powder class soil capillary water lift velocity soon, highly big, moisture is built up seriously during subzero temperature, after moisture increased, soil structures was very easily lost stable, destruction such as produce sink deformation, lobe, frost boiling, freeze thawing, cave in.The Yellow River is in seasonal frost zone towards wash plain, and ground water table is more shallow, on average has only about 1.5m, and the wicking action of soil is strong, and Gu Shui is huge to the influence of areas formerly flooded by the Huanghe River silt roadbed.For the silt roadbed of areas formerly flooded by the Huanghe River, it is one of the main path on water immersion roadbed road surface that underground water upwards permeates by wicking action.Conventional now way is that admixture cement improves as basic unit the silt performance, i.e. the cement stabilizing method.But this method does not still solve base material intensity shortcoming lower, that endangered by capillary water easily.
The methyl siliconic acid sodium solution is a kind of alkalescence, nontoxicity chemical substance, sodium methyl silicate is as a kind of novel rigid architectural waterproof material, have excellent mechanical property and good penetration crystallinity, silanol base in the molecular structure and the silanol radical reaction dehydrated crosslinking in the silicate material, at the surperficial and inner insoluble waterproof macromolecular compound that generates one deck few molecules thick of structured material, be netted silicone resin, thereby realize that " anti-capillary effect " forms excellent water-repellent layer.Simultaneously, have micro-expansibility, increase the degree of compactness performance, early strength increases very fast, and later strength is bigger, can improve the integral waterproofing and the Stability Analysis of Structures performance of subgrade and pavement.Having not yet to see sodium methyl silicate uses in the silt of areas formerly flooded by the Huanghe River.
Summary of the invention
The present invention's purpose provides that a kind of production cost is low, the method for utilizing sodium methyl silicate, polyacrylamide, flyash, lime stabilization areas formerly flooded by the Huanghe River silt of practical process, environment friendly and pollution-free and excellent road performance.
The present invention is by optimizing the proportioning of methyl siliconic acid sodium water solution, polyacrylamide, flyash, lime, silt, respectively organizes the performance index of Stabilized Soil by experimental test, obtains best proportioning and realizes the object of the invention, and concrete technical scheme is as follows:
During site operation,, add the methyl siliconic acid sodium water solution then and mix all earlier with polyacrylamide, flyash, lime, the full and uniform mixing of silt, tiling or spilling is distributed on the working face, and vibroll rolls 3～5 times, and static pressure is received light, after construction finishes, surperficial wet curing 5-7 days.
Each weight percentages of components is:
Methyl siliconic acid sodium water solution: 2-5%
Non-ionic polyacrylamide: 0.5-2%
Flyash: 20-50%
Lime: 5-15%
Silt: 30-70%
Wherein, the mass percentage concentration of methyl siliconic acid sodium water solution is 15%, is formed with common fresh water or tap water dilution by commercially available 30% methyl siliconic acid sodium water solution; The preferred 300-1000 ten thousand of Molecular Weight for Polyacrylamide, flyash, lime, silt is air-dry and cross the 5mm sieve.
The present invention has following beneficial effect: starting material sources is wide, is easy to produce and allotment, and institute's materials used is nontoxic, have no irritating odor, and does not fire, not quick-fried, non-volatile, and environmentally safe meets the safety and environmental protection requirement fully.Adopt existing installation during this method site operation, need not add new installation, be easy to on-site construction operations.Road surface after construction has been avoided pavement depression distortion, lobe, frost boiling, freeze thawing well, has been caved in etc.
In addition, flyash contains a large amount of aluminium salt, and the amido linkage of aluminium salt and polyacrylamide reacts, and a plurality of polyacrylamides are molecule crosslinked, forms network-like structure, increases the parcel ability to soil particle.Simultaneously, more hydrophilic amido linkage is consumed, and increases the hydrophobic nature of clad surface, also helps to improve the anti-water disintegration ability of silt.Utilize the polyacrylamide molecular change adult form polymer of crosslinking reaction, improved the ultimate compression strength of silt line style.Aluminum ion and hydroxyl close aluminum ion and also can enter in the electrostatic double layer by ion-exchange, weaken the intensity of electrostatic double layer.On the other hand, the hydroxide ion that lime dissolving ionization produces promotes the amide group hydrolysis of polyacrylamide, the NH that hydrolysis produces
4 +Can more easily enter between layer mineral, reduce the water-swelling of soil; In entire reaction course, the negative charge on soil particle surface is transferred on the polyacrylamide chain, and the potential energy of particle surface is transferred to the hydroxide ion in the soil solution.Conversely, the hydrolysis of amide group has reduced the hydroxide ion concentration in the soil solution, promotes lime dissolution equilibrium forward to move, and has further increased the Ca in the soil solution
2+Concentration helps the formation of soil strength and the raising of water stability.
The present invention mixes sodium methyl silicate, polyacrylamide, flyash, lime by a certain percentage, can improve the unconfined compression strength and the anti-permeability performance of silt, has anti-capillary water effect, the restriction capillary water rises, thereby obtain all good road structures of mechanics and water, warm nature, prevent that subgrade and pavement from destroying, and prolongs the life-span of road.Industrial residue flyash is utilized again, help realizing low-carbon environment-friendly, under the equality strength condition, can save a large amount of cement.The inventive method can reduce the maintenance cost, guarantees the road service level, improves the economic benefit and the social benefit of road investment.
In order to confirm beneficial effect of the present invention, the performance of the inventive method and traditional cement stabilizing silt is analyzed.Test 3d, 7d, 28d unconfined compression strength respectively with reference to " highway engineering stabilized with inorganic binder testing of materials rules " (JTG E51-2009), test result is seen Fig. 1～2.
Permeability coefficient
KBe an index of concentrated expression soil body penetration ability, a basic parameter must using when also being seepage calculation.Permeability coefficient is bigger, and water-permeable is strong more, otherwise weak more.Can determine by test method
KValue is verified the anti-permeability performance of the inventive method.
During test, the transparent plastics tube that to get two cross sections be A is adorned the cement stabilizing silt respectively in two tubes and the inventive method is stablized the silt sample, divides 6 layers of filling, and the every layer of 2cm that bankets evenly vibrates with waddy.Sample leaves standstill health 7d, makes its abundant consolidation reaction.After the preparation of soil sample finishes, open water valve, make water two samples of flowing through from top to bottom, discharge through water outlet.Treat head difference
△ hWith ooze out flow
QAfter stable, measure through certain hour
tIn the flow through water yield of sample
V, by formula
K=(
V*
L)/(
A*
△ h*
t) measure the permeability coefficient that cement stabilizing silt and the inventive method are stablized the silt sample.
Description of drawings
Fig. 1 is a stable composition method of the present invention and traditional cement stabilizing silt failing load comparative analysis figure in the different length of times;
Fig. 2 is a stable composition method of the present invention and traditional cement stabilizing silt unconfined compression strength comparative analysis figure in the different length of times;
Among the figure :-Δ-be the cement stabilizing silt;---be stable composition silt of the present invention.
Embodiment
Below further invention is described by specific embodiment, but the present invention is not produced any restriction.
The comparative example 1:
With silt 700g air-dry and mistake 5mm sieve, cement 105g, water 87.4g puts into the pallet that do not absorb water, and artificial mix is even, by a standard specimen 203.1g, takes by weighing three parts, makes Φ 50 * 50mm test block respectively, is sealed into the column criterion health.Adopt computer constant stress pressure testing machine, equably test specimen is added load continuously, destroy the record failing load until test specimen with the speed of 0.05kN/s.The 7d unconfined compression strength that records is 1.52MPa.Testing this prescription sample permeability coefficient by the previous experiments method simultaneously is 1.09 * 10
-4
Embodiment 1:
With silt 600g air-dry and mistake 5mm sieve, flyash 300g, lime 60g, molecular weight 3,000,000 polyacrylamide 10g, the methyl siliconic acid sodium water solution 30g of mass percent 15%, mix is even, by a standard specimen 203.1g, take by weighing three parts, make Φ 50 * 50mm test block respectively, be sealed into the column criterion health.Adopt computer constant stress pressure testing machine, equably test specimen is added load continuously, destroy the record failing load until test specimen with the speed of 0.05kN/s.The 7d unconfined compression strength that records is 1.59MPa, and testing this prescription sample permeability coefficient by the previous experiments method simultaneously is 8.84 * 10
-5
Embodiment 2:
With silt 700g air-dry and mistake 5mm sieve, flyash 200g, lime 60g, molecular weight 3,000,000 polyacrylamide 10g, the methyl siliconic acid sodium water solution 30g of mass percentage concentration 15% stirs, by a standard specimen 203.1g, take by weighing three parts, make Φ 50 * 50mm test block respectively, be sealed into the column criterion health.Adopt computer constant stress pressure testing machine, equably test specimen is added load continuously, destroy the record failing load until test specimen with the speed of 0.05kN/s.The 7d unconfined compression strength that records is 1.56MPa, and testing this prescription sample permeability coefficient by the previous experiments method simultaneously is 8.92 * 10
-5
As shown in Figure 1, for same proportioning, along with the growth of conditioned time, the failing load that needs increases.For different proportionings, the failing load that novel method is stablized the silt needs is all bigger.For common cement stabilizing silt, the failing load that health 3d, 7d, 28d test specimen need is respectively 2.13 kN, 2.99 kN, 3.39 kN.Novel method is stablized silt, and the failing load that health 3d, 7d, 28d test specimen need is respectively 2.51 kN, 3.13 kN, 3.96 kN.
As shown in Figure 2, for same proportioning, along with the growth of conditioned time, unconfined compression strength increases, and the length of time, the unconfined compression strength of 3d, 7d, 28d cement stabilizing silt was respectively 1.09MPa, 1.52MPa, 1.73MPa.For different proportionings, the unconfined compression strength that novel method is stablized silt obviously increases.By contrast, novel method is stablized the silt respective intensities and is reached 1.28 MPa, 1.59 MPa, 2.02 MPa respectively, has increased by 17.43%, 4.61%, 16.76% respectively.This proves absolutely that novel method is stablized silt can obviously improve unconfined compression strength.
As shown in Figure 2, novel method is stablized silt 7d strength ratio 3d intensity and has been increased by 24.22%, and 28d strength ratio 7d intensity has increased by 27.04%, and 28d strength ratio 3d intensity has increased by 57.81%, 3d intensity has reached 63.37% of 28d intensity, and 7d intensity has reached 78.71% of 28d intensity.Illustrating increases comparatively fast early stage, and the later stage increases slower, and preceding 3d increases the fastest, and 7d intensity can well be represented 28d intensity.
Adopt embodiment 2 proportionings to carry out site operation, tiling or spilling is distributed on the working face, and vibroll rolls 3～5 times, and static pressure is received light, after construction finishes, and surperficial wet curing 5-7 days.Road surface after construction was observed through 2 years, defective such as avoided pavement depression distortion, lobe, frost boiling, freeze thawing well, cave in.
Claims (2)
1. the stable composition method of areas formerly flooded by the Huanghe River silt is characterized in that, realizes by the following method:
During site operation,, add the methyl siliconic acid sodium water solution then and mix all, tile or spill and be distributed on the working face earlier with polyacrylamide, flyash, lime, the full and uniform mixing of silt, vibroll rolls 3～5 times, static pressure is received light, after construction finishes, and surperficial wet curing 5-7 days;
Each components by weight is preferably:
Methyl siliconic acid sodium water solution: 2-5%
Non-ionic polyacrylamide: 0.5-2%
Flyash: 20-50%
Lime: 5-15%
Silt: 30-70%.
2. the stable composition method of areas formerly flooded by the Huanghe River silt according to claim 1, it is characterized in that: methyl siliconic acid sodium water solution mass percentage concentration is 15%; The non-ionic polyacrylamide preferred molecular weight is 300-1000 ten thousand.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049212A (en) * | 2016-07-29 | 2016-10-26 | 北京市政建设集团有限责任公司 | Improved roadbed filling material based on low liquid limit silt and a manufacturing method thereof |
| CN107119521A (en) * | 2017-05-25 | 2017-09-01 | 中国水利水电第十工程局有限公司 | It is a kind of to improve the method that High water cut silt and silt carry out roadbed filling |
| CN108191309A (en) * | 2017-12-22 | 2018-06-22 | 东南大学 | A kind of improved foundation silt and the method using its progress roadbed filling |
| CN111072339A (en) * | 2019-11-29 | 2020-04-28 | 山东省交通科学研究院 | Silt composite curing agent and silt curing method |
| CN112942007A (en) * | 2021-02-25 | 2021-06-11 | 闫相明 | Construction process of super-thick wide cement stabilized macadam base |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215141A (en) * | 2008-01-02 | 2008-07-09 | 邓亚光 | Soft soil curing agent |
| CN102020990A (en) * | 2009-09-22 | 2011-04-20 | 山东宏艺科技股份有限公司 | Novel high-strength waterproof composite solid curing agent |
-
2013
- 2013-04-17 CN CN201310133902.8A patent/CN103214224B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215141A (en) * | 2008-01-02 | 2008-07-09 | 邓亚光 | Soft soil curing agent |
| CN102020990A (en) * | 2009-09-22 | 2011-04-20 | 山东宏艺科技股份有限公司 | Novel high-strength waterproof composite solid curing agent |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049212A (en) * | 2016-07-29 | 2016-10-26 | 北京市政建设集团有限责任公司 | Improved roadbed filling material based on low liquid limit silt and a manufacturing method thereof |
| CN107119521A (en) * | 2017-05-25 | 2017-09-01 | 中国水利水电第十工程局有限公司 | It is a kind of to improve the method that High water cut silt and silt carry out roadbed filling |
| CN107119521B (en) * | 2017-05-25 | 2019-12-17 | 中电建十一局工程有限公司 | Method for improving high-water-content silt and silt soil to fill roadbed |
| CN108191309A (en) * | 2017-12-22 | 2018-06-22 | 东南大学 | A kind of improved foundation silt and the method using its progress roadbed filling |
| CN108191309B (en) * | 2017-12-22 | 2021-02-02 | 东南大学 | Modified roadbed silty soil and method for roadbed filling by using same |
| CN111072339A (en) * | 2019-11-29 | 2020-04-28 | 山东省交通科学研究院 | Silt composite curing agent and silt curing method |
| CN112942007A (en) * | 2021-02-25 | 2021-06-11 | 闫相明 | Construction process of super-thick wide cement stabilized macadam base |
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| CN103214224B (en) | 2014-12-03 |
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