CN110510899A - A kind of roadbed soil material for frozen earth roadbed protection - Google Patents
A kind of roadbed soil material for frozen earth roadbed protection Download PDFInfo
- Publication number
- CN110510899A CN110510899A CN201910827790.3A CN201910827790A CN110510899A CN 110510899 A CN110510899 A CN 110510899A CN 201910827790 A CN201910827790 A CN 201910827790A CN 110510899 A CN110510899 A CN 110510899A
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- China
- Prior art keywords
- roadbed
- soil
- composite shape
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- phase
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a kind of roadbed soil materials for frozen earth roadbed protection, according to mass fraction, including following component: 79~93 parts of soil, 5~15 parts of composite shape-setting phase-change materials, 2~6 parts of lime；Wherein composite shape-setting phase-change material is the porous powder for being adsorbed with phase transition agent.Composite shape-setting phase-change material of the invention contains phase transition agent, it can be changed by phase is keeping own temperature constant or is varying less, work as temperature change, when temperature increases, the heat of pavement structure conduction can be absorbed and stored in the form of latent heat, simultaneously, the low heat conductivity of composite shape-setting phase-change material can prevent heat from entering frozen earth roadbed inside, in conjunction with above-mentioned two aspect collective effect can reduce warm season enter it is frozen earth roadbed in heat, alleviate the freeze thawing of frozen soil, frozen soil upper limit avoided to degenerate.Subgrade soils material composition in the present invention is simple, does not there is the substance of degradation risk containing polymer etc., more environmentally friendly；And component of the invention is simpler, technique is simpler, and cost is lower.
Description
Technical field
The invention belongs to pavement construction material technical fields, and in particular to a kind of subgrade soils material for frozen earth roadbed protection
Material.
Background technique
Frozen soil refer to zero degrees celsius hereinafter, and various rocks and soil containing ice, again may be used according to the duration freezed
Frozen soil is divided into frost zone and ever-frozen ground.China is third place in the world frozen soil big country, is being distributed to the north of Qinling Mountain_Huaihe River line
Frozen soil, wherein frost zone is distributed mainly on Middle-north Area, such as North Shaanxi, Southern Nei Mongol, Hebei, the ground such as Ningxia
Area accounts for about the 53% of China's national territorial area, and ever-frozen ground is distributed mainly on northeast Xing'an Mountains region and Qinghai-xizang Plateau Region,
Account for about the 21% of China's national territorial area.
Since ice plays cementing effect in frozen soil, the physico-mechanical properties and temperature of frozen soil are closely related.Work as frozen soil
When internal ice is undergone phase transition, huge variation will occur for the engineering characteristics of frozen soil.It counts, has according to the disease causes of Qinghai-Tibet Highway
85% disease generation is all caused by frozen soil thaw collapse, including roadbed side slope cracking, roadbed recess, collapses etc., and Frost heave of frozen soil
Cause other 15% disaster.In order to cope with the roadbed disaster caused by temperature, domestic and foreign scholars develop hot pin, block stone
The technical measures such as layer, ventilation duct, insulating layer carry out the protection of frozen soil；Although however, these technical measures all have it is certain
Permafrost protection effect, but there is also many problems simultaneously, such as: hot pin technical work low efficiency, efficient working range is small,
Ventilation duct cost is high, and block stone layer and insulating layer technology radiating efficiency are low；Such as " the frozen soil polyurethane of patent 201811162359.3
In reinforcement material and preparation method thereof ", using a kind of pure and mild polyester polyol of a variety of polyether polyols as major ingredient, and it is equipped with foam
Stabilizer, water, catalyst, foaming agent fire retardant, reinforcing agent and anti-settling agent, obtain a kind of product, and obtained product not only may be used
To guarantee the intensity and toughness of material, and anti-flammability is good, Low-Temperature Size stability is good, intensity is high, good toughness, but the product
In contain multiple polymers, the risk for having degradation to generate pollution is used for a long time.A kind of for another example " the frozen soil of patent 201710364494.5
Cement, mineral admixture, fiber, swelling are used in the regional bentonite modified cement based porous materials of roadbed heat-insulating and shock-absorbing "
Soil, water-reducing agent, waterproofing agent, polymer and water mixing, there is an effect of heat-insulating and shock-absorbing, but complicated component, Yi Yinqi soil pollution,
And there is the limitation of service life in formula containing polymer.
Summary of the invention
The object of the present invention is to provide a kind of roadbed soil material for frozen earth roadbed protection, which can pass through phase
State transformation is keeping own temperature constant or is varying less, and achievees the purpose that automatic temperature-control, thus alleviate the generation of roadbed freeze thawing,
And frozen soil upper limit is avoided to degenerate.
This roadbed soil material for frozen earth roadbed protection of the present invention, according to mass fraction, including following component: 79~
93 parts of soil, 5~15 parts of composite shape-setting phase-change materials, 2~6 parts of lime；Wherein composite shape-setting phase-change material is to be adsorbed with phase transition agent
Porous powder.
The roadbed soil material for frozen earth roadbed protection further includes 14~24 parts of water.
Preferably, the roadbed soil material for frozen earth roadbed protection, according to mass fraction, including with the following group
Part: 81~91 parts of soil, 7~13 parts of composite shape-setting phase-change materials, 2~6 parts of lime, 15~22 parts of water.
The soil is that China Frozen Ground Area is commonly filled with soil, and the lime is III grade and the above lime.
The phase transition agent is one of octanoic acid, n-nonanoic acid, n-dodecane, n-tetradecane or a variety of.
The porous powder is diatomite, expanded perlite, expanded graphite, one of active carbon or a variety of.
The composite shape-setting phase-change material preparation method, comprising the following steps: dry porous powder at 90~120 DEG C
It does to constant weight, then the porous powder of drying is placed in phase transition agent, be stirred 3~4h of absorption, then filter, filter residue is placed in
It is dry to constant weight at 40~50 DEG C on filter paper, obtain composite shape-setting phase-change material.
The phase transition agent should be totally submerged porous powder；The final acquisition composite shape-setting phase-change material quality is answered
It is 1.5~2.0 times of porous powder quality.
Using the method for preparing roadbed for the roadbed soil material of frozen earth roadbed protection:
S1. sub-layer soil matrix is rolling bulldozed；
S2. pave plain soil, and watering is stewing to expect and just put down to roll；
S3. lime and composite shape-setting phase-change material are mixed in proportion；
S4. according to the ratio of lime, composite shape-setting phase-change material and element soil, by the lime and composite shape-setting phase transformation material in S3
Material mixture uniformly paves along road bed, and mix；
S5. roadbed moisture content is detected, is rolled after shaping, then wet curing at least seven days.
Beneficial effects of the present invention: 1) composite shape-setting phase-change material in the present invention contains phase transition agent, can pass through phase
State transformation is keeping own temperature constant or is varying less, and works as temperature change, and when temperature increases, pavement structure conduction can be absorbed
Heat and stored in the form of latent heat, simultaneously as the low heat conductivity energy of composite shape-setting phase-change material, can prevent heat into
Enter frozen earth roadbed inside, in conjunction with above-mentioned two aspect collective effect can reduce warm season enter it is frozen earth roadbed in heat, alleviate
The freeze thawing of frozen soil, avoids frozen soil upper limit from degenerating.2) porous material absorption phase transition agent is used in the present invention, is stored in phase transition agent more
In Porous materials, it will not be lost easily.3) Frozen Ground Area Roadbed Soil is mostly bad soil, and present invention employs lime to carry out to banketing
Improvement, enables composite shape-setting phase-change material preferably to play its effect.4) the subgrade soils material composition in the present invention is simple, does not contain
There is polymer etc. to have the substance of degradation risk, it is more environmentally friendly；And component of the invention is simpler, technique is simpler, and cost is lower.5)
The temperature of the frozen earth roadbed inside of present invention active control from source, has been effectively relieved the Frozen-thawed cycled of frozen soil, can reduce because
Roadbed frost damage caused by the Frozen-thawed cycled of frozen soil or thaw collapse disaster, ensure that road surface service quality.
Specific embodiment
In order to better understand the present invention, below in conjunction with the embodiment content that the present invention is further explained, it is clear that retouched
The embodiment stated is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, originally
Field those of ordinary skill every other embodiment obtained without making creative work, belongs to the present invention
The range of protection.
Embodiment 1
The preparation of composite shape-setting phase-change material: by diatomite, drying to constant weight at 105 DEG C, is then placed in n-tetradecane
In solution, solution needs to be totally submerged diatomite, is then stirred absorption 3.5h, and filtering removes unadsorbed n-tetradecane,
Subsequently 45 DEG C drying to constant weight, obtain composite shape-setting phase-change material, the quality of composite shape-setting phase-change material is about diatomite 1.8
Times.
The composition of phase-change thermal storage roadbed soil material used in the present embodiment are as follows: 84 parts of low liquid limit clay, 6 parts of lime, composite shape-setting
10 parts of phase-change material, the optimum moisture content determined through compaction test is 18.6%.
The soil weighed up is placed in long square plate, lime and composite shape-setting phase-change material dry mixing is first added, adds 18.6 parts
Water-wet is mixed, and sample is placed in closed container or polybag (closing sack) after mix is uniform and infiltrates 12h, then according to " highway
Engineered inorganic binder stabilizing material testing regulations " (JTG E51-2009) regulation using static pressure method prepare cylinder test specimen
(50 × 50mm of Ф) carries out indoor exposure experiment by test specimen obtained and only by the contrast specimen of low liquid limit clay compacting simultaneously,
Phase-change thermal storage subgrade soils surface of test piece temperature is 2.7 DEG C lower than contrast specimen surface temperature, and bottom surface temperature is 4.8 DEG C low.
Embodiment 2
The preparation of composite shape-setting phase-change material: by expanded graphite, drying to constant weight at 105 DEG C, is then placed in the molten of n-nonanoic acid
In liquid, solution needs to be totally submerged expanded graphite, is then stirred absorption 4h, and filtering removes unadsorbed n-nonanoic acid, subsequently
50 DEG C drying to constant weight, obtains composite shape-setting phase-change material, and the quality of composite shape-setting phase-change material is about 1.7 times of expanded graphite.
The composition of phase-change thermal storage roadbed soil material used in the present embodiment are as follows: 82 parts of sandy soil, 3 parts of lime, composite shape-setting phase transformation
15 parts of material volume, the optimum moisture content determined through compaction test is 16.3%.
The soil weighed up is placed in long square plate, lime and composite shape-setting phase-change material dry mixing is first added, adds 16.3 parts
Water-wet is mixed, and sample is placed in closed container or polybag (closing sack) after mix is uniform and infiltrates 4h, then according to " highway work
Journey stabilized with inorganic binder testing of materials regulation " (JTG E51-2009) regulation using static pressure method prepare cylinder test specimen (Ф
150 × 150mm), indoor exposure experiment, phase transformation storage are carried out simultaneously by test specimen obtained and only by the contrast specimen of sandy soil compacting
Hot subgrade soils surface of test piece temperature is 2.5 DEG C lower than contrast specimen surface temperature, and bottom surface temperature is 6.7 DEG C low.
Claims (9)
1. a kind of roadbed soil material for frozen earth roadbed protection, according to mass fraction, including following component: 79~93 parts of soil, 5
~15 parts of composite shape-setting phase-change materials, 2~6 parts of lime；Wherein composite shape-setting phase-change material is the periporate for being adsorbed with phase transition agent
Body.
2. the roadbed soil material according to claim 1 for frozen earth roadbed protection, which is characterized in that described is used to freeze
The roadbed soil material of dirt road base protection further includes 14~24 parts of water.
3. the roadbed soil material according to claim 1 or 2 for frozen earth roadbed protection, which is characterized in that according to quality
Number, including following component: 81~91 parts of soil, 7~13 parts of composite shape-setting phase-change materials, 2~6 parts of lime, 15~22 parts of water.
4. the roadbed soil material according to claim 1 for frozen earth roadbed protection, which is characterized in that the soil is China
Frozen Ground Area is commonly filled with soil, and the lime is III grade and the above lime.
5. the roadbed soil material according to claim 1 for frozen earth roadbed protection, which is characterized in that the phase transition agent
For one of octanoic acid, n-nonanoic acid, n-dodecane, n-tetradecane or a variety of.
6. the roadbed soil material according to claim 1 for frozen earth roadbed protection, which is characterized in that the periporate
Body is diatomite, expanded perlite, expanded graphite, one of active carbon or a variety of.
7. the roadbed soil material according to claim 1 for frozen earth roadbed protection, which is characterized in that described is compound fixed
Shape phase-change material preparation method, comprising the following steps: drying to constant weight at 90~120 DEG C by porous powder, then will drying
Porous powder be placed in phase transition agent, be stirred 3~4h of absorption, then filter, filter residue is placed on filter paper dry at 40~50 DEG C
It is dry to constant weight, obtain composite shape-setting phase-change material.
8. the roadbed soil material according to claim 7 for frozen earth roadbed protection, which is characterized in that the phase transition agent
Porous powder should be totally submerged；The final acquisition composite shape-setting phase-change material quality should be the 1.5 of porous powder quality
~2.0 times.
9. a kind of method that roadbed is prepared using the roadbed soil material described in claim 1 for frozen earth roadbed protection, including
Following steps:
S1. sub-layer soil matrix is rolling bulldozed
S2. pave plain soil, and watering is stewing to expect and just put down to roll
S3. lime and composite shape-setting phase-change material are mixed in proportion；
S4. according to the ratio of lime, composite shape-setting phase-change material, element soil, the lime in S3 is mixed with composite shape-setting phase-change material
It closes object uniformly to pave along road bed, and mix；
S5. roadbed moisture content is detected, is rolled after shaping, then wet curing at least seven days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910827790.3A CN110510899A (en) | 2019-09-03 | 2019-09-03 | A kind of roadbed soil material for frozen earth roadbed protection |
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| CN201910827790.3A CN110510899A (en) | 2019-09-03 | 2019-09-03 | A kind of roadbed soil material for frozen earth roadbed protection |
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| CN110510899A true CN110510899A (en) | 2019-11-29 |
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| CN201910827790.3A Pending CN110510899A (en) | 2019-09-03 | 2019-09-03 | A kind of roadbed soil material for frozen earth roadbed protection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113174263A (en) * | 2021-05-14 | 2021-07-27 | 太原理工大学 | Formula for improving freeze-thaw performance of loess subgrade by phase-change material and preparation method thereof |
| CN115075281A (en) * | 2022-07-26 | 2022-09-20 | 西南石油大学 | CFG pile-raft composite foundation structure capable of relieving thermal disturbance of frozen soil and construction method |
| RU2782642C1 (en) * | 2021-03-22 | 2022-10-31 | Северно-Западный институт экологии и природных ресурсов Академии наук Китая | Structure of temperature cooling for engineering and technical design of empils and slopes in permafrost regions |
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Cited By (4)
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| RU2782642C1 (en) * | 2021-03-22 | 2022-10-31 | Северно-Западный институт экологии и природных ресурсов Академии наук Китая | Structure of temperature cooling for engineering and technical design of empils and slopes in permafrost regions |
| CN113174263A (en) * | 2021-05-14 | 2021-07-27 | 太原理工大学 | Formula for improving freeze-thaw performance of loess subgrade by phase-change material and preparation method thereof |
| CN115075281A (en) * | 2022-07-26 | 2022-09-20 | 西南石油大学 | CFG pile-raft composite foundation structure capable of relieving thermal disturbance of frozen soil and construction method |
| CN115075281B (en) * | 2022-07-26 | 2023-10-31 | 西南石油大学 | CFG pile-raft composite foundation structure capable of relieving thermal disturbance of frozen soil and construction method |
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Application publication date: 20191129 |