CN103214224B - 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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- CN103214224B CN103214224B CN201310133902.8A CN201310133902A CN103214224B CN 103214224 B CN103214224 B CN 103214224B CN 201310133902 A CN201310133902 A CN 201310133902A CN 103214224 B CN103214224 B CN 103214224B
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- silt
- water
- polyacrylamide
- lime
- silty soil
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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 ofly for improving, improve the novel method of areas formerly flooded by the Huanghe River silt performance, belong to pavement construction material and road performance technical field.
Background technology
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, has quality loose, easily moisture absorption, the feature such as plasticity index is low, perviousness is better.Areas formerly flooded by the Huanghe River silt belongs to containing sand silt, powder class soil capillary water lift velocity soon, highly large, when subzero temperature, moisture is built up seriously, after moisture increases, soil structures is very easily lost stable, the destruction such as produce sink deformation, lobe, frost boiling, freeze thawing, cave in.The Yellow River rushes wash plain in seasonal frost zone, and ground water table is more shallow, on average only has 1.5m left and right, and the wicking action of soil is strong, and Gu Shui is huge on the impact 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 main path of water immersion subgrade and pavement that underground water upwards permeates by wicking action.Conventional way is that admixture cement improves as basic unit silt performance, i.e. cement stabilizing method now.But this method does not still solve the shortcoming that base material intensity is lower, be easily subject to capillary water harm.
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, there is excellent mechanical property and good penetrant crystalline, silanol radical reaction dehydrated crosslinking in silanol base and silicate material in molecular structure, generate the thick insoluble waterproof macromolecular compound of the several molecules of one deck on structured material surface and inside, be netted silicone resin, form excellent water-repellent layer thereby realize " anti-capillary effect ".Meanwhile, have micro-expansibility, increase degree of compactness performance, early strength increases very fast, and later strength is larger, can improve integral waterproofing and the Stability Analysis of Structures performance of subgrade and pavement.Have 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 object is to provide 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, 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, obtain best proportioning and realize the object of the invention, and concrete technical scheme is as follows:
When site operation, first by polyacrylamide, flyash, lime, the full and uniform mixing of silt, then add methyl siliconic acid sodium water solution to mix all, tiling or spread are on 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 are air-dry and cross 5mm sieve.
The present invention has following beneficial effect: starting material sources is wide, is easy to produce and allotment, the material non-toxic that uses, has no irritating odor, and does not fire, not quick-fried, non-volatile, and environmentally safe, meets safety and environmental protection requirement completely.When the method site operation, adopt existing installation, need not add new installation, be easy to on-site construction operations.Road surface after construction has been avoided well pavement depression distortion, lobe, frost boiling, freeze thawing, has been caved in etc.
In addition, flyash contains a large amount of aluminium salt, and aluminium salt reacts with the amido linkage of polyacrylamide, by molecule crosslinked multiple polyacrylamides, forms network-like structure, increases the parcel ability to soil particle.Meanwhile, more hydrophilic amido linkage is consumed, and increases the hydrophobic nature of clad surface, also contributes to improve the water resistant disintegration ability of silt.Utilize crosslinking reaction by the polyacrylamide molecular change adult form polymer of line style, improved the ultimate compression strength of silt.Aluminum ion and hydroxyl close aluminum ion and also can enter in electrostatic double layer by ion-exchange, weaken the intensity of electrostatic double layer.On the other hand, lime dissolves the hydroxide ion that ionization produces, and promotes the amide group hydrolysis of polyacrylamide, the NH that hydrolysis produces
4 +can enter relatively easily between layer mineral, reduce the water swellability of soil; In whole reaction process, the negative charge on soil particle surface is transferred on 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, is conducive to 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 unconfined compression strength and the anti-permeability performance of silt, there is anti-capillary water effect, restriction capillary water rises, thereby obtain all good road structures of mechanics and water, warm nature, prevent that subgrade and pavement from destroying, and extends the life-span of road.By industrial residue flyash recycling, be conducive to realize low-carbon environment-friendly, under equality strength condition, can save a large amount of cement.The inventive method can reduce maintenance cost, ensures Assessment of Serviceability of Roads, improves economic benefit and the social benefit of road investment.
For the proved beneficial effect of the invention, the performance of the inventive method and traditional cement stabilized silt and sand is analyzed.Test respectively 3d, 7d, 28d unconfined compression strength with reference to " highway engineering stabilized with inorganic binder testing of materials code " (JTG E51-2009), test result is shown in Fig. 1～2.
Permeability coefficient
kan index of concentrated expression soil body penetration ability, a basic parameter must using while being also seepage calculation.Permeability coefficient is larger, and water-permeable is stronger, otherwise more weak.Can determine by test method
kvalue is verified the anti-permeability performance of the inventive method.
When test, get the transparent plastics cylinder that two cross sections are A, in two cylinders, fill respectively cement stabilized silt and sand and the inventive method is stablized silt sample, point 6 layers of filling, 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, 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
tinside the flow through water yield of sample
v, by formula
k=(
v×
l)/(
a×
△ h×
t) measure cement stabilized silt and sand and the inventive method and stablize the permeability coefficient of silt sample.
Brief description of the drawings
Fig. 1 is stable composition method of the present invention and traditional cement stabilized silt and sand failing load comparative analysis figure in the different length of times;
Fig. 2 is stable composition method of the present invention and traditional cement stabilized silt and sand unconfined compression strength comparative analysis figure in the different length of times;
In figure :-Δ-be cement stabilized silt and sand;---be stable composition silt of the present invention.
Embodiment
Further invention is described by specific embodiment below, but the present invention is not produced to any restriction.
Comparative example 1:
By silt 700g air-dry and that 5mm sieves excessively, 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 three parts, makes respectively Φ 50 × 50mm test block, is sealed into column criterion health.Adopt computer constant stress pressure testing machine, with the speed continuous uniform of 0.05kN/s test specimen is added to load, until test specimen destroys, record failing load.The 7d unconfined compression strength recording is 1.52MPa.Test this formula sample permeability coefficient by previous experiments method is 1.09 × 10 simultaneously
-4.
Embodiment 1:
By silt 600g air-dry and that 5mm sieves excessively, 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 three parts, make respectively Φ 50 × 50mm test block, be sealed into column criterion health.Adopt computer constant stress pressure testing machine, with the speed continuous uniform of 0.05kN/s test specimen is added to load, until test specimen destroys, record failing load.The 7d unconfined compression strength recording is 1.59MPa, and test this formula sample permeability coefficient by previous experiments method is 8.84 × 10 simultaneously
-5.
Embodiment 2:
By silt 700g air-dry and that 5mm sieves excessively, 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 three parts, make respectively Φ 50 × 50mm test block, be sealed into column criterion health.Adopt computer constant stress pressure testing machine, with the speed continuous uniform of 0.05kN/s test specimen is added to load, until test specimen destroys, record failing load.The 7d unconfined compression strength recording is 1.56MPa, and test this formula sample permeability coefficient by previous experiments method is 8.92 × 10 simultaneously
-5.
As shown in Figure 1, for same proportioning, along with the growth of conditioned time, the failing load needing increases.For different proportionings, the failing load that novel method is stablized silt needs is all larger.For common cement stabilized silt and sand, 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 stabilized silt and sand 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 silt respective intensities and is reached respectively 1.28 MPa, 1.59 MPa, 2.02 MPa, has increased respectively 17.43%, 4.61%, 16.76%.This absolutely proves, novel method is stablized silt can obviously improve unconfined compression strength.
As shown in Figure 2, novel method has been stablized silt 7d strength ratio 3d strength increase 24.22%, 28d strength ratio 7d strength increase 27.04%, 28d strength ratio 3d strength increase 57.81%, 3d intensity has reached 63.37% of 28d intensity, and 7d intensity has reached 78.71% of 28d intensity.Illustrate and increase early stage comparatively fast, the later stage increases slower, and front 3d increases the fastest, and 7d intensity can well represent 28d intensity.
Adopt embodiment 2 proportionings to carry out site operation, tiling or spread are on 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, observed through 2 years, the defect such as avoided well pavement depression distortion, lobe, frost boiling, freeze thawing, 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:
When site operation, first by polyacrylamide, flyash, lime, the full and uniform mixing of silt, then add that methyl siliconic acid sodium water solution is mixed thoroughly, tiling or spread be on working face, vibroll rolls 3～5 times, static pressure is received light, after construction finishes, and surperficial wet curing 5-7 days;
Each components by weight:
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 as claimed in claim 1, is characterized in that: methyl siliconic acid sodium water solution mass percentage concentration is 15%; Non-ionic polyacrylamide molecular weight is 300-1000 ten thousand.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310133902.8A CN103214224B (en) | 2013-04-17 | 2013-04-17 | Compound stabilizing method for silty soil in Yellow River flooded areas |
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| CN201310133902.8A CN103214224B (en) | 2013-04-17 | 2013-04-17 | Compound stabilizing method for silty soil in Yellow River flooded areas |
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| 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 |
| 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 |
| CN108191309B (en) * | 2017-12-22 | 2021-02-02 | 东南大学 | Modified roadbed silty soil and method for roadbed filling by using same |
| CN111072339B (en) * | 2019-11-29 | 2023-04-14 | 山东省交通科学研究院 | Silt composite curing agent and silt curing method |
| CN112942007B (en) * | 2021-02-25 | 2022-08-30 | 成都建工路桥建设有限公司 | Construction process of super-thick wide cement stabilized macadam foundation |
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| CN101215141B (en) * | 2008-01-02 | 2010-06-16 | 邓亚光 | Soft soil curing agent |
| CN102020990B (en) * | 2009-09-22 | 2014-08-06 | 山东宏艺科技股份有限公司 | Novel high-strength waterproof composite solid curing agent |
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