CN111138142A - Sub-base layer structure for preventing cracking of road base layer - Google Patents
Sub-base layer structure for preventing cracking of road base layer Download PDFInfo
- Publication number
- CN111138142A CN111138142A CN202010141883.3A CN202010141883A CN111138142A CN 111138142 A CN111138142 A CN 111138142A CN 202010141883 A CN202010141883 A CN 202010141883A CN 111138142 A CN111138142 A CN 111138142A
- Authority
- CN
- China
- Prior art keywords
- subbase
- cement
- rubber powder
- waste rubber
- mineral aggregate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005336 cracking Methods 0.000 title claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 58
- 239000002699 waste material Substances 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 45
- 239000004575 stone Substances 0.000 claims abstract description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 20
- 239000011707 mineral Substances 0.000 claims abstract description 20
- 229910002651 NO3 Inorganic materials 0.000 claims abstract description 14
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000011398 Portland cement Substances 0.000 claims abstract description 9
- 239000000758 substrate Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 39
- 239000011435 rock Substances 0.000 description 4
- 239000010426 asphalt Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Inorganic materials [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/18—Coherent pavings made in situ made of road-metal and binders of road-metal and bituminous binders
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention relates to a sub-base structure for preventing a road base layer from cracking, which is characterized in that: the subbase uses the waste rubber powder modified cement stabilized macadam to replace the traditional graded macadam or semi-rigid cement stabilized macadam as the subbase, and the subbase comprises the following mineral aggregate in proportion by weight: the composition proportion of 10-30mm broken stone, 10-20mm broken stone, 5-10mm broken stone, stone nitrate and waste rubber powder is 15% -25%, 20% -27%, 15% -25%, 17% -21% and 2% -12%; adding cement in an amount of 3-7% by weight of the total weight of the mineral aggregate, ordinary portland cement of a cement type and strength grade of 42.5; the particle size of the waste rubber powder is 40-60 meshes, the thickness of the subbase layer is 15-25cm, and the design strength of the subbase layer is 3.0-5.0 MPa. The invention uses the waste rubber powder modified cement stabilized macadam as the subbase, reduces the constraint effect on the upper lower base layer, reduces the tensile stress and the tensile strain of the bottom of the upper lower base layer, and effectively prevents the road base layer from cracking.
Description
Technical Field
The invention belongs to the technical field of road engineering, and particularly relates to a sub-base structure for preventing a road base layer from cracking.
Background
In road engineering, a semi-rigid substrate is the primary structural form. The cement stabilized macadam has the advantages of high strength, good plate body performance, good economy and the like, and is the most widely used semi-rigid base material in China. According to statistics, 90% of expressway bases in China adopt cement stabilized macadam. However, in practical application, the cement stabilized macadam is easy to cause reflection cracks on a pavement surface layer due to dry shrinkage, temperature shrinkage, bending, fatigue performance and the like, so that asphalt (or cement) pavement cracks, and a technical problem to be solved in the industry is formed. In order to solve the above-mentioned key problems, many related studies have been conducted at home and abroad. The common technical measure is that the cement stabilized macadam is modified by using an additive; the polypropylene fiber is used for improving the crack resistance of the cement stabilized macadam; optimizing the grading design of the cement stabilized macadam; pre-pressing in the construction process by adopting a pre-micro-cracking technology; the asphalt macadam and the semi-rigid base layer are compounded, the graded macadam and the semi-rigid base layer are compounded, and the like. Although the above measures alleviate the cracking problem of the cement stabilized macadam to a certain extent, the technical bottleneck of the cracking of the cement stabilized macadam base is not thoroughly broken through. The main reasons are: neglecting the use environment of the base layer, there is no relevant study on the influence of the properties of the lying layer (the sub-base layer) on the base layer. At present, the underlayment is mainly composed of two kinds of materials, one is a flexible underlayment represented by graded crushed stone, and the other is a semi-rigid underlayment represented by cement-stabilized crushed stone. The graded broken stone subbase layer belongs to a loose structure, does not transfer tensile stress and tensile strain, causes the upper base layer to have more load, increases the bending tensile stress at the bottom of the base layer, and is easy to crack. The cement stabilized macadam is used as a subbase layer, the rigidity is high, the constraint effect on the upper base layer is increased, and the base layer is easy to crack. The performance of the waste rubber powder modified cement stabilized macadam is between that of graded macadam and cement stabilized macadam. The cement stabilized macadam is doped with a certain amount of waste rubber powder, so that the performance defect that the graded macadam does not transfer tensile stress and tensile strain can be overcome, and the constraint effect on the upper base course can be reduced, thereby obviously eliminating the cracking of the road base course.
Disclosure of Invention
The road is from top to bottom pitch surface course, transition layer, upper strata, lower basic unit, subbase layer and soil base course, and upper strata and lower basic unit are known as the basic unit. The invention aims to provide a subbase structure for preventing a road base layer from cracking in order to overcome the defects of the prior art. The technical scheme adopted for realizing the purpose of the invention is as follows: the utility model provides a prevent subbase structure of road base cracking which characterized in that: the subbase uses the waste rubber powder modified cement stabilized macadam to replace the traditional graded macadam or semi-rigid cement stabilized macadam as the subbase, and the subbase comprises the following mineral aggregate in proportion by weight: the composition proportion of 10-30mm broken stone, 10-20mm broken stone, 5-10mm broken stone, stone nitrate and waste rubber powder is 15% -25%, 20% -27%, 15% -25%, 17% -21% and 2% -12%; adding cement in the amount of 3-7 wt% of the mineral aggregate, the grain size of the waste rubber powder is 40-60 mesh, the thickness of the subbase layer is 15-25cm, and the design strength of the subbase layer is 3.0-5.0 MPa. Compared with graded broken stones, the waste rubber powder modified cement stabilized broken stones are of a continuous structure and have good force transmission effect, so that the tensile stress and tensile strain at the bottom of the upper lower base layer are reduced; compared with cement stabilized macadam, the waste rubber powder modified cement stabilized macadam has large toughness and ductility, and can reduce the constraint effect on the upper lower base layer. Meanwhile, the waste rubber powder modified cement stabilized macadam is used as the subbase layer, so that the friction coefficient between the crushed macadam and the upper base layer can be increased, and the tensile stress is reduced. The 7d age unconfined compressive strength of the waste rubber modified cement stabilized macadam as the subbase layer is the same as that of the unmodified cement stabilized macadam. The use method of the waste rubber powder in the cement stabilized macadam comprises the following steps: the waste rubber powder replaces part of saltpeter in the cement stabilized macadam. The preparation method of the waste rubber powder modified cement stabilized macadam comprises the following steps: after the waste rubber powder replaces part of the rock nitrate, determining the optimal water content and the maximum dry density after the waste rubber powder is doped; under the condition, the dosage of the cement is optimized, so that the strength of the cement meets the design strength requirement.
The invention uses the waste rubber powder modified cement stabilized macadam as the subbase, reduces the constraint effect on the upper lower base layer, reduces the tensile stress and the tensile strain of the bottom of the upper lower base layer, and effectively prevents the road base layer from cracking.
Drawings
Fig. 1 is a schematic view of a road structure.
In the figure, 1, an asphalt surface course, 2, a transition course, 3, an upper base course, 4, a lower base course, 5, a subbase course, 6 and a soil base course.
Detailed Description
The utility model provides a prevent subbase structure of road base cracking which characterized in that: the subbase uses the waste rubber powder modified cement stabilized macadam to replace the traditional graded macadam or semi-rigid cement stabilized macadam as the subbase, and the subbase comprises the following mineral aggregate in proportion by weight: the composition proportion of 10-30mm broken stone, 10-20mm broken stone, 5-10mm broken stone, stone nitrate and waste rubber powder is 15% -25%, 20% -27%, 15% -25%, 17% -21% and 2% -12%; adding cement in an amount of 3-7% by weight of the total weight of the mineral aggregate, ordinary portland cement of a cement type and strength grade of 42.5; the particle size of the waste rubber powder is 40-60 meshes, the thickness of the subbase layer is 15-25cm, and the design strength of the subbase layer is 3.0-5.0 MPa.
Example 1: designing a subbase layer with the strength of 3.0MPa and the thickness of 20cm, wherein the subbase layer is waste rubber powder modified cement stabilized macadam, the waste rubber powder is 40 meshes, and the waste rubber powder replaces part of rock nitrate; the subbase layer comprises the following mineral aggregate in parts by weight: the composition proportion of 10-30mm, 10-20mm, 5-10mm, stone nitrate and waste rubber powder is 25%, 27%, 25%, 17% and 6%; cement, ordinary portland cement with a cement type and strength grade of 42.5, was added at a dosage of 6% by total weight of the mineral aggregate.
Example 2: designing a subbase layer with the strength of 4.0MPa and the thickness of 20cm, wherein the subbase layer is waste rubber powder modified cement stabilized macadam, the waste rubber powder is 60 meshes, and the waste rubber powder replaces part of rock nitrate; the subbase layer comprises the following mineral aggregate in parts by weight: the composition proportion of 10-30mm, 10-20mm, 5-10mm, stone nitrate and waste rubber powder is 25%, 27%, 25%, 19% and 4%; cement was added at a dosage of 5% of the total weight of the mineral aggregate, the cement type and strength rating being: 42.5 of ordinary portland cement.
Example 3: designing a subbase layer with the strength of 5.0MPa and the thickness of 20cm, wherein the subbase layer is waste rubber powder modified cement stabilized macadam, the waste rubber powder is 60 meshes, and the waste rubber powder replaces part of rock nitrate; the subbase layer comprises the following mineral aggregate in parts by weight: the composition proportion of 10-30mm, 10-20mm, 5-10mm, stone nitrate and waste rubber powder is 25%, 27%, 25%, 21% and 2%; cement was added at a dosage of 6% of the total weight of the mineral aggregate, the type and strength rating of cement being: 42.5 of ordinary portland cement.
Claims (4)
1. The utility model provides a prevent subbase structure of road base cracking which characterized in that: the subbase uses the waste rubber powder modified cement stabilized macadam to replace the traditional graded macadam or semi-rigid cement stabilized macadam as the subbase, and the subbase comprises the following mineral aggregate in proportion by weight: the composition proportion of 10-30mm broken stone, 10-20mm broken stone, 5-10mm broken stone, stone nitrate and waste rubber powder is 15% -25%, 20% -27%, 15% -25%, 17% -21% and 2% -12%; adding cement in the amount of 3-7 wt% of the mineral aggregate, common Portland cement of 42.5 type and strength grade, waste rubber powder of 40-60 mesh size, subbase layer of 15-25cm thickness and subbase layer of 3.0-5.0MPa design strength.
2. The underlayment structure for protecting a roadway substrate from cracking as recited in claim 1, wherein: the subbase design intensity is 3.0MPa, and thickness is 20cm, for the stable rubble of waste rubber powder modified cement, waste rubber powder is 40 meshes, and the subbase is the mineral aggregate mix proportion by weight: the composition proportion of 10-30mm, 10-20mm, 5-10mm, stone nitrate and waste rubber powder is 25%, 27%, 25%, 17% and 6%; cement was added at a dosage of 6% of the total weight of the mineral aggregate, the type and strength rating of cement being: 42.5 of ordinary portland cement.
3. The underlayment structure for protecting a roadway substrate from cracking as recited in claim 1, wherein: the subbase design intensity is 4.0MPa, and thickness is 20cm, for the stable rubble of waste rubber powder modified cement, waste rubber powder is 60 meshes, and the subbase is the mineral aggregate mix proportion by weight: the composition proportion of 10-30mm, 10-20mm, 5-10mm, stone nitrate and waste rubber powder is 25%, 27%, 25%, 19% and 4%; cement was added at a dosage of 5% of the total weight of the mineral aggregate, the cement type and strength rating being: 42.5 of ordinary portland cement.
4. The underlayment structure for protecting a roadway substrate from cracking as recited in claim 1, wherein: the subbase design intensity is 5.0MPa, and thickness is 20cm, for the stable rubble of waste rubber powder modified cement, waste rubber powder is 60 meshes, and the subbase is the mineral aggregate mix proportion by weight: the composition proportion of 10-30mm, 10-20mm, 5-10mm, stone nitrate and waste rubber powder is 25%, 27%, 25%, 21% and 2%; cement was added at a dosage of 6% of the total weight of the mineral aggregate, cement type and strength grade: 42.5 of ordinary portland cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010141883.3A CN111138142A (en) | 2020-03-04 | 2020-03-04 | Sub-base layer structure for preventing cracking of road base layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010141883.3A CN111138142A (en) | 2020-03-04 | 2020-03-04 | Sub-base layer structure for preventing cracking of road base layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111138142A true CN111138142A (en) | 2020-05-12 |
Family
ID=70528574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010141883.3A Pending CN111138142A (en) | 2020-03-04 | 2020-03-04 | Sub-base layer structure for preventing cracking of road base layer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111138142A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116947419A (en) * | 2023-07-28 | 2023-10-27 | 辽宁中源建设发展有限公司 | Cement stabilized macadam base and construction method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100690393B1 (en) * | 2006-10-31 | 2007-03-12 | (주)한동재생공사 | Method of paving the outer layer of road with aspalt concrete |
| CN102390956A (en) * | 2011-07-26 | 2012-03-28 | 济南黄河路桥工程公司 | Scrap cement stabilize broken stone recycled pavement base course |
-
2020
- 2020-03-04 CN CN202010141883.3A patent/CN111138142A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100690393B1 (en) * | 2006-10-31 | 2007-03-12 | (주)한동재생공사 | Method of paving the outer layer of road with aspalt concrete |
| CN102390956A (en) * | 2011-07-26 | 2012-03-28 | 济南黄河路桥工程公司 | Scrap cement stabilize broken stone recycled pavement base course |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116947419A (en) * | 2023-07-28 | 2023-10-27 | 辽宁中源建设发展有限公司 | Cement stabilized macadam base and construction method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Achtemichuk et al. | The utilization of recycled concrete aggregate to produce controlled low-strength materials without using Portland cement | |
| CN101386484B (en) | Polypropylene fiber lime-fly ash aggregate base material and preparation method thereof | |
| CN103708787B (en) | A kind of highway road surface cement stabilized macadam | |
| CN109944124B (en) | Combined base asphalt pavement paving method | |
| Jallu et al. | Flexural fatigue behavior of fly ash geopolymer stabilized-geogrid reinforced RAP bases | |
| CN109336499A (en) | A kind of steady gangue of water fills big Stone base material and its design method | |
| Havanagi et al. | Feasibility of copper slag–fly ash–soil mix as a road construction material | |
| CN112376349B (en) | Long-life flexible base asphalt pavement structure | |
| Al-Naje et al. | A review of sustainable materials to improve geotechnical properties of soils | |
| CN103588424A (en) | Durable high-modulus asphalt mixture based on hard asphalt particles | |
| Mahmutluoglu et al. | Sustainable implementation of glass manufacturing waste and geogrids in the improvement of fine-grained soils | |
| CN111138142A (en) | Sub-base layer structure for preventing cracking of road base layer | |
| Abbas | Roller compacted concrete: Literature review | |
| Hossain | Development of stabilised soils for construction applications | |
| Rabab'ah et al. | Effect of using Oil Shale Ash on geotechnical properties of cement-stabilized expansive soil for pavement applications | |
| CN210151500U (en) | Combined base asphalt pavement structure | |
| Tan et al. | Performance evaluation of cement-stabilized oil shale semicoke as base or subbase course construction material | |
| CN102535297A (en) | Polypropylene fiber concrete roadway structure suitable for large-tonnage cars and construction method | |
| Ameen et al. | Effect of West African Standard Compactive Energy on Stone Dust Stabilized Lateritic Soil | |
| Skels et al. | WOOD FLY ASH STABILIZED ROAD BASE LAYERS WITH HIGH RECYCLED ASPHALT PAVEMENT CONTENT. | |
| CN111138143A (en) | Novel road infrastructure | |
| Sood et al. | Evaluation of construction materials for soil stabilization in road making industry–a techno economic study | |
| John et al. | Variability of Lime-based Lateritic Soil enhanced with Bitumen with varying proportions. | |
| CN203960702U (en) | A kind of semi-rigid asphalt pavement structure | |
| Okonta et al. | Compaction and strength of lime–Fly ash stabilized collapsible residual sand |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200512 |
|
| RJ01 | Rejection of invention patent application after publication |