CN104846807A - Polypropylene fiber ribbed salinized soil and curing method thereof - Google Patents
Polypropylene fiber ribbed salinized soil and curing method thereof Download PDFInfo
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- CN104846807A CN104846807A CN201510163575.XA CN201510163575A CN104846807A CN 104846807 A CN104846807 A CN 104846807A CN 201510163575 A CN201510163575 A CN 201510163575A CN 104846807 A CN104846807 A CN 104846807A
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Abstract
The invention relates to polypropylene fiber ribbed salinized soil and a curing method thereof, and belongs to the technical field of soft foundation processing. The polypropylene fiber ribbed salinized soil is mixed with polypropylene fiber, lime and coal ash, the polypropylene fiber ribbing rate ranges from 0.1% to 0.3%, the lime content ranges from 6% to 10%, and the coal ash content ranges from 12% to 20%. The method for ribbing and curing the salinized soil with the polypropylene fiber, the lime and the coal ash includes the following steps of firstly, processing the polypropylene fiber, wherein the polypropylene fiber is cut off and preprocessed, and the length of the polypropylene fiber ranges from 12 mm to 31 mm; secondly, ribbing and curing the salinized soil, wherein the polypropylene fiber with the mass ribbing rate of 0.1% to 0.3%, the lime with mass content of 6% to 10%, and the coal ash with mass content of 12% to 20% are evenly mixed with the salinized soil to be cured. The method is simple in construction, low in price, economical, environmentally friendly, good in curing effect, high in compression resistance strength and shear resistance strength, high in deformation resistance, capable of being widely applied to a salinized soil curing project and the like.
Description
Technical field
The invention belongs to Soft Soil Subgrade Treatment Techniques field, particularly relate to a kind of Polypropylene Fiber Reinforced salinized soil and curing thereof.
Background technology
At present, beach salty soil is a kind of special soils in fine particulate, lyotropic salt containing 0.3%-3%, main component is sodium chloride, villaumite meets water-soluble solution, evaporative crystallization, chlorine saline soil easily produces bad engineering problems such as moltenly falling into, salt is swollen and moisture absorption is softening, could must use through modification or solidification process in construction project.
Because chlorine saline soil has certain corrosivity to cement, therefore usually adopt the material cured such as lime, flyash beach salty soil.But the fragility of lime fly ash solidified earth is comparatively strong, easily occurs the problems such as crackle under action of traffic loading.
Summary of the invention
The present invention provides a kind of Polypropylene Fiber Reinforced salinized soil and curing thereof for solving Problems existing in known technology.
The method of polypropylene fibre of the present invention and the common reinforcement stabilized saline soil of lime fly ash, in solidified earth, mix that ductility is good, toughness is high, corrosion resistant polypropylene filaments, admixture lime and flyash, make while raising solidified earth intensity, the anti-deformation of soil can be strengthened again, to adapt to the fatigue effect of traffic loading, slow down the T/A that crackle occurs, there is resistance preferably and split effect.
The present invention take polypropylene filaments as reinforcement material, beach salty soil co-curing with lime fly ash, to fall into because the salt of beach salty soil is swollen, molten and caused low-intensity and large deformation problem are softened in moisture absorption to solve, improve intensity and the non-deformability of reinforced earth, make it meet the requirement making embankment fill material, be applied in the road project in beach salty soil area.
The modification of salinized soil engineering and solidification should meet the requirement making full use of local earth material and material convenient construction, low cost, quality and meet industry standard or national standard.For the solidification of beach salty soil, due to the salinity effect in soil, to cement, there is certain corrosivity, and cement price is relatively high, therefore should not adopts cement solidification.Because beach salty soil has strong moisture-absorption characteristics, conventional lime stabilized saline soil is easy to moisture absorption and softens, and loses partial intensities, can not be used for the embankment of high-grade highway.Select flyash as embankment fill material, one is because flyash belongs to industrial discharge waste residue, cheap, and two is that flyash quality is light, is used in the settling amount that embankment can be reduced in littoral soft soil area.
Polypropylene fibre has light weight, high, acidproof, alkaline-resisting, antimicrobial, the dry wet brute force of intensity is identical, low temperature resistivity strong, the premium properties of nontoxic pollution-free.Use polypropylene fibre and lime fly ash reinforcement stabilized saline soil, the intensity of solidified earth can be improved, make subgrade settlement even, reduce polygon ground, improve anti-fatigue performance and the freezing and thawing performance of soil, improve durability and the ageing resistance of soil.
An object of the present invention is to provide a kind of cheap, economic environmental protection, and solidification effect is good, effectively improves compressive strength and the shear strength of soil, strengthens polypropylene fibre and the lime fly ash reinforcement stabilized saline soil of the features such as the anti-deformation of soil.
The technical scheme that Polypropylene Fiber Reinforced salinized soil of the present invention is taked for the technical problem existed in solution known technology is:
A kind of Polypropylene Fiber Reinforced salinized soil, be characterized in: admixture polypropylene fibre, lime and flyash in salinized soil, the quality rate of reinforcement of polypropylene fibre is 0.1%-0.3%, polypropylene fibre length is 12mm-31mm, the mass content of lime is 6-10%, and the mass content of flyash is 12-20%.
Polypropylene Fiber Reinforced salinized soil of the present invention can also take following technical scheme:
Described Polypropylene Fiber Reinforced salinized soil, is characterized in: polypropylene fibre is pencil monofilament, and filament diameter is 0.02-0.05mm.
Described Polypropylene Fiber Reinforced salinized soil, is characterized in: salinized soil is medium chlorine saline soil, chlorine root Cl
-content is 9-9.5g/kg.
Two of object of the present invention is to provide a kind of construction simply, and solidification effect is good, effectively improves compressive strength and the shear strength of soil, strengthens the polypropylene fibre of feature and the methods of lime fly ash reinforcement stabilized saline soil such as native anti-deformation.
The technical scheme that the curing of Polypropylene Fiber Reinforced salinized soil of the present invention is taked is:
A curing for Polypropylene Fiber Reinforced salinized soil, is characterized in: Polypropylene Fiber Reinforced salinized soil curing comprises following activities:
(1) polypropylene fibre process: polypropylene fibre is carried out blocking pretreatment, polypropylene fibre length is 12mm-31mm;
(2) salinized soil reinforcement solidification: by the lime of the polypropylene fibre of quality rate of reinforcement 0.1%-0.3%, mass content 6-10%, the flyash of mass content 12-20%, the mass content of lime is 6-10%, the mass content of flyash is 12-20%, and stirring with salinized soil is cured construction.
The curing of Polypropylene Fiber Reinforced salinized soil of the present invention can also take following technical scheme:
The curing of described Polypropylene Fiber Reinforced salinized soil, is characterized in: after the solidification of salinized soil reinforcement, carry out construction and maintenance, curing time is 21-28 days.
The advantage that the present invention has and good effect are:
Polypropylene Fiber Reinforced salinized soil and curing thereof are owing to have employed the brand-new technical scheme of the present invention, compared with prior art, the present invention adopts polypropylene filaments to make reinforcement material, the a small amount of lime of admixture and flyash in soil, common reinforcement stabilized saline soil, belong to physico-chemical process, intensity and the non-deformability of soil can be improved, be a kind of with low cost, good endurance and simple reinforcement curing of constructing.The present invention has following obvious advantage and feature:
Polypropylene fibre mixes in lime fly ash solidified earth, with low cost, construction is simple, solidification effect is good, can be widely used in salinized soil solidification engineering.
Polypropylene fibre and the common reinforcement solidifying beach salty soil of lime fly ash, not only increase compressive strength and the shear strength of soil, also enhance the anti-deformation of soil.
Polypropylene fibre mixes in soil, is similar to isotropism, does not change the physico-mechanical properties of soil self.Fiber and the common reinforcement stabilized saline soil of lime fly ash belong to physico-chemical process.
Detailed description of the invention
For technology contents of the present invention, Characteristic can be understood further, hereby exemplify following examples, and be described in detail as follows:
Embodiment 1
A kind of Polypropylene Fiber Reinforced salinized soil, salinized soil is medium chlorine saline soil.Admixture polypropylene fibre, lime and flyash in salinized soil.Polypropylene fibre is pencil monofilament, and filament diameter is 0.02mm; The quality rate of reinforcement of polypropylene fibre is 0.1%, and polypropylene fibre length is 12mm-31mm, and the mass content of lime is 6%, and the mass content of flyash is 12%.
The physico-mechanical properties of salinized soil physical property, salt ion content and polypropylene fibre is in table 1, table 2 and table 3.
The basic physical property index of table 1 salinized soil
The main mineral constituent of soil is followed successively by quartz, feldspar, mica; Clay mineral is montmorillonite, illite, a small amount of kaolinite.
Table 2 Salts In Salt-affected Soil ion concentration test result
The physical and mechanical parameter of table 3 polypropylene fibre
Embodiment 2
A kind of Polypropylene Fiber Reinforced salinized soil, salinized soil is medium chlorine saline soil.Salinized soil composition is with embodiment 1.Admixture polypropylene fibre, lime and flyash in salinized soil.Polypropylene fibre is pencil monofilament, and filament diameter is 0.048 ㎜; The quality rate of reinforcement of polypropylene fibre is 0.3%, and polypropylene fibre length is 12mm-31mm, and the mass content of lime is 10%, and the mass content of flyash is 20%.
Embodiment 3
A curing for Polypropylene Fiber Reinforced salinized soil, its solidification construction comprises following activities:
(1) polypropylene fibre process: polypropylene fibre is carried out blocking pretreatment, polypropylene fibre length is 12mm-31mm;
(2) salinized soil reinforcement solidification: by the lime of the polypropylene fibre of quality rate of reinforcement 0.1%, mass content 6%, the flyash of mass content 12%, stir with salinized soil and be cured construction.
After the solidification of salinized soil reinforcement, carry out construction and maintenance, curing time is 28 days.
Embodiment 4
A curing for Polypropylene Fiber Reinforced salinized soil, its solidification construction comprises following activities:
(1) polypropylene fibre process: polypropylene fibre is carried out blocking pretreatment, polypropylene fibre length is 12mm-31mm;
(2) salinized soil reinforcement solidification: by the lime of the polypropylene fibre of quality rate of reinforcement 0.3%, mass content 10%, the flyash of mass content 20%, stir with salinized soil and be cured construction.
After the solidification of salinized soil reinforcement, carry out construction and maintenance, curing time is 21d.
The concrete enforcement test process of the present embodiment is as follows:
Intensity as the Polypropylene Fiber Reinforced solidified earth of embankment fill material use mainly considers compressive strength and shear strength, therefore, utilize without side limit crush test and triaxial compression test, compare compressive strength and the shear strength of salinized soil, fiber and steel bar reinforced salinized soil, lime fly ash solidified earth, fiber and lime fly ash reinforcement stabilized saline soil, determine the fiber and steel bar reinforced length that is suitable for and quality rate of reinforcement, set forth the reinforcement solidification effect of polypropylene fibre and lime fly ash reinforcement stabilized saline soil.
(1) crush test of Polypropylene Fiber Reinforced salinized soil
Tested by heavy compaction and determine that the optimum moisture content of salinized soil is 15%, maximum dry density is 1.92g/cm
3.Following institute column data all with optimum moisture content and 96% degree of compaction for sampling.Specimen finish 61.8mm, high 125mm.
According to the result of the compressive property of early-stage Study natural fiber and lime reinforcement solidified earth, the quality rate of reinforcement selecting polypropylene fibre is 0.1%, 0.15%, 0.2%, 0.25% and 0.3%; Fiber and steel bar reinforced length is 6,12,19,25 and 31mm.Study different reinforced lengths and quality rate of reinforcement to the impact of reinforced earth compressive strength, determine the reinforced length that is suitable for and quality rate of reinforcement.Result show: the suitable reinforced length of fiber and steel bar reinforced solidified earth is 12mm-25mm, quality rate of reinforcement be the compressive strength of the Fiber reinforced soil of 0.2%-0.3% compared with salinized soil, improve a lot.Test result is in table 4.
The unconfined compression strength of table 4 Polypropylene Fiber Reinforced salinized soil and salinized soil
Table 4 shows: when fiber and steel bar reinforced length is identical, and the compressive strength of the Fiber reinforced soil of quality rate of reinforcement 0.25% is maximum; When quality rate of reinforcement is identical, the compressive strength of the reinforced earth of fibre length 19mm is maximum, and 25mm takes second place.Therefore, without in the limit crush test of side, the fiber and steel bar reinforced length that fiber and steel bar reinforced salinized soil is suitable for is 19mm, quality rate of reinforcement is 0.25%.
Table 5 is under different salt content condition, the unconfined compression strength of salinized soil, Polypropylene Fiber Reinforced salinized soil, fiber and lime fly ash reinforcement stabilized saline soil.Fiber and steel bar reinforced length 19mm, quality rate of reinforcement 0.25%.
The unconfined compression strength of Polypropylene Fiber Reinforced salinized soil and salinized soil under the different salt content condition of table 5
From table 5, with the increase of salt content, the compressive strength of salinized soil, fiber and steel bar reinforced salinized soil and fiber and lime fly ash reinforcement stabilized saline soil all reduces, and when salt content is greater than 3.6, the compressive strength range of decrease increases.The compressive strength of fiber and steel bar reinforced salinized soil is all greater than salinized soil, and when salt content is 1%, 2%, 3%, 3.6%, 4.5%, 5.5%, amplification is respectively 17.5%, 34.8%, 33.2%, 26.5%, 67.4%, 107%.When showing that salt content is larger, the reinforcement effects of fiber is more remarkable, fiber while the compressive property improving soil, the undesirable feature such as can also improve that salinized soil moltenly falls into, salt is swollen and moisture absorption is softening.
Compared with salinized soil, the compressive strength amplification of fiber and lime fly ash reinforcement stabilized saline soil is more remarkable.When salt content is 1%, 2%, 3%, 3.6%, 4.5%, 5.5%, amplification is respectively 191%, 242%, 202%, 180%, 143%, 202%.
(2) crush test of polypropylene fibre and lime fly ash reinforcement stabilized saline soil
Sampling: fiber and steel bar reinforced length 19mm; Quality rate of reinforcement 0.25%; Lime intermingled quantity 6%; Doping quantity of fly ash 12%.
Lime fly ash solidified earth, fiber curing time intensity test different from lime fly ash reinforcement solidified earth the results are shown in Table 6.
The compressive strength of table 6 different curing time lime fly ash solidified earth and fiber and lime fly ash reinforcement solidified earth
Non-confining compression strength test result shows, and when curing time is 7d, 14d, 21d, 28d, the unconfined compression strength of fiber and lime fly ash reinforcement solidified earth, compared with lime fly ash solidified earth, improves 43%, 43%, 53%, 55% respectively.
Fiber and steel bar reinforced salinized soil has isotropic mechanical property, and compared with salinized soil, its compressive strength significantly improves.Mixing of fiber makes the soil body form three-D space structure system, part tensile stress born by fiber, plays function served as bridge to the connection between soil particle, the slippage of effective constraint soil particle and deflection, limit the generation of crack of soils, carry out and extend, enhance plasticity and the resistance to overturning of the soil body.
(3) triaxial compression test of polypropylene fibre and lime fly ash reinforcement stabilized saline soil
According to without side limit crush test result, suitable reinforced length and quality rate of reinforcement is selected to prepare sample.
Sampling: fiber and steel bar reinforced length 19mm; Quality rate of reinforcement 0.2%; Lime intermingled quantity 6%; Doping quantity of fly ash 12%.
The triaxial compression test of polypropylene fibre and lime fly ash reinforcement stabilized saline soil the results are shown in Table 7 and table 8.
The Shear Strength Index of table 7 lime fly ash solidified earth and polypropylene fibre and lime fly ash reinforcement stabilized saline soil
The failure strain of table 8 lime fly ash solidified earth and polypropylene fibre and lime fly ash reinforcement stabilized saline soil
Table 7 shows: curing time is 7,14,21,28d time, the cohesion of fiber and lime fly ash reinforcement stabilized saline soil, compared with lime fly ash solidified earth, improve 58%, 54%, 50% and 49% respectively, but angle of internal friction change is less.Show that reinforcement effects major embodiment is the increase of cohesion, and less on the impact of angle of internal friction.When confined pressure is identical, the failure strain of fiber and steel bar reinforced salinized soil is also significantly increased, and after stress reaches peak value, still keeps higher residual strength, and along with the increase of axial strain, loss of strength reduces.With the prolongation of curing time, the growth rate of cohesion tapers off trend, and when maintenance 21d and 28d, cohesion growth rate tends towards stability.
Table 8 illustrates: curing time is 7,14,21,28d time, the failure strain of fiber and lime fly ash reinforcement stabilized saline soil has and significantly improves.When curing time is 21d, lime fly ash solidified earth changes brittle fracture into by plastic failure; And fiber and lime fly ash reinforcement stabilized saline soil are still plastic failure, show that reinforcement changes the mode of failure of soil, extend time to rupture.
When load action is in Fiber reinforced soil, produce the trend of the mutual changing of the relative positions between muscle soil, the frictional resistance between muscle soil increases, and strengthens, cause soil classifiction to improve to the restraint forces of soil.On the other hand, fiber is disorder distribution in soil, is interweaved together, and the displacement of any section fibre all can affect the fiber with all directions of its intertexture, forms space constraint effect.Therefore, reinforcement not only improves soil classifiction, also constrains the distortion of soil.
Claims (5)
1. a Polypropylene Fiber Reinforced salinized soil, it is characterized in that: salinized soil admixture polypropylene fibre, lime and flyash, the quality rate of reinforcement of polypropylene fibre is 0.1%-0.3%, polypropylene fibre length is 12mm-31mm, the mass content of lime is 6-10%, and the mass content of flyash is 12-20%.
2. according to Polypropylene Fiber Reinforced salinized soil according to claim 1, it is characterized in that: polypropylene fibre is pencil monofilament, filament diameter is 0.02-0.05mm.
3. according to the Polypropylene Fiber Reinforced salinized soil described in claim 1 or 2, it is characterized in that: salinized soil is medium chlorine saline soil, chlorine root Cl
-content is 9-9.5g/kg.
4. a curing for Polypropylene Fiber Reinforced salinized soil, is characterized in that: Polypropylene Fiber Reinforced salinized soil curing comprises following activities:
(1) polypropylene fibre process: polypropylene fibre is carried out blocking pretreatment, polypropylene fibre length is 12mm-31mm;
(2) salinized soil reinforcement solidification: by the lime of the polypropylene fibre of quality rate of reinforcement 0.1%-0.3%, mass content 6-10%, the flyash of mass content 12-20%, stir with salinized soil and be cured construction.
5. according to the curing of Polypropylene Fiber Reinforced salinized soil according to claim 4, it is characterized in that: after the solidification of salinized soil reinforcement, carry out construction and maintenance, curing time is 21-28 days.
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Cited By (1)
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| CN105152588A (en) * | 2015-09-29 | 2015-12-16 | 长安大学 | Loess road slope surface protection material and preparation |
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Application publication date: 20150819 |