CN101660287A - Multi-scale fiber reinforced cement stable gravel roadbase material - Google Patents
Multi-scale fiber reinforced cement stable gravel roadbase material Download PDFInfo
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- CN101660287A CN101660287A CN200910190976A CN200910190976A CN101660287A CN 101660287 A CN101660287 A CN 101660287A CN 200910190976 A CN200910190976 A CN 200910190976A CN 200910190976 A CN200910190976 A CN 200910190976A CN 101660287 A CN101660287 A CN 101660287A
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Abstract
The invention provides a multi-scale fiber reinforced cement stable gravel roadbase material doped with different-length fiber, such as micro-steel fiber and the like. The invention provides a methodwhich can better improve the performance of cement stable gravel roadbase material than flexible fiber and effectively improve the shrinkage crack resistance capability and mechanical property of theroadbase material. The multi-scale fiber reinforced cement stable gravel roadbase material of the invention comprises cement stable gravel and multi-scale fiber material, wherein, the multi-scale fiber material comprises micro-steel fiber and glass fiber, and the doping amount of the micro-steel fiber and the glass fiber is respectively 0.8-1.2kg/m<3>. The invention adopts multi-scale short fiber,has favorable mixture workability and even fiber dispersion and is easy to satisfy construction requirements; low fiber doping amount effectively lowers material cost; in the process of base materialcrack expansion, addition of short cut glass fiber causes to form a plurality of micro cracks, which further effectively improves impact resistance of the base material and increases crack energy.
Description
Technical field
The present invention relates to build building material technical field, be specifically related to a kind of cement stable gravel roadbase material.
Background technology
The cement stabilized macadam semi-rigid sub-base material has that bearing capacity height, rigidity are big, good integrity, water stability is good and the anti-advantages such as fatigue behaviour is good of driving a vehicle, and is the principal mode of present China Higher level highway pavement structure.Yet, because cement stabilized macadam semi-rigid sub-base material fragility is big, non-deformability is low, under temperature, humidity situation of change, be easy to generate shrinkage crack, and reflex to asphalt surface course, and form " reflection crack ", cause the road surface to be destroyed too early, influence the functional performance on road surface, shorten the application life of highway.Along with a large amount of uses of semi-rigid asphalt pavement, crack problem becomes the major defect of this road structure form.
The cement stabilized macadam semi-rigid type base is proposed rational improvement measure have crucial meaning application life to prolong highway.Form the focus that minimizing " reflection crack " is the present research of China by improving base material, very many trial and research have been arranged.For example: publication number is the grading method of the disclosed coarse aggregate gap gradation compact of Chinese invention patent Shen Qing Publication manual cement stabilized granular of CN1916282A and the method for inspection of skeleton thereof, and publication number is the disclosed a kind of method of preventing and treating asphalt pavement reflective cracking of Chinese invention patent Shen Qing Publication manual of CN101323512A etc.But two major measure as prevention coagulation great soil group material shrinkage cracking: fiber reinforcement and interpolation economization agent, the application study in cement stabilized macadam base material is less.Aspect fiber reinforcement, polypropylene fibre is only adopted in existing research, for example: PP fiber reinforced cement stabilization gravel shrinkage [number of the edition 1671-1637 (2008) 04-0030-05], but all do not relate to steel fibre, more do not consider to adopt multiple dimensioned fiber reinforcement.
Summary of the invention
In view of this, in order to address the above problem, the invention provides the fibre-reinforced cement stable gravel roadbase materials of different length such as the little steel fibre of a kind of admixture, more can improve the method for cement stabilized macadam base material performance than flexible fiber, effectively improve the anti-shrinkage cracking ability and the mechanical property of road surface base layer material.
The object of the present invention is achieved like this: multi-scale fiber reinforced cement stable gravel roadbase material, comprise cement stabilized macadam, also comprise multiple dimensioned fibrous material, described multiple dimensioned fibrous material comprises little steel fibre and glass fiber, and the volume of little steel fibre and glass fiber is respectively 0.8-1.2kg/m
3
Further, described little steel fibre diameter 0.1-0.2mm, length 10-20mm, tensile strength 〉=600MPa, elongation rate 〉=35%;
Further, described glass fiber diameter 0.02-0.1mm, length 5mm, tensile strength 〉=1.0GPa, limit elongation 〉=3.0%;
Further, described cement stabilized macadam is made up of gel rubber material, aggregate and water;
Further, described gel rubber material is a cement, and content is 90～110Kg/m
3, aggregate is an aggregate chips, content is 2100～2200Kg/m
3
Further, little volume content of steel fibers is that 1.0kg, glass fiber volume are 1.2kg in every cubic metre of multi-scale fiber reinforced cement stable gravel roadbase material.
Cement stabilized macadam be a kind of be skeleton with the coarse aggregate, with cement is the fragile material of filling, because the resistance to tension of itself is poor, ductility is very little, and there is natural crack defect, under the shrinkage stress effect, is easy to cracking, so improve the tensile property and the toughness of material by certain means, make the ductility enhancing of material become extremely important, and mixing of fiber have tangible enhancing action of crack arrest to the cement stabilized macadam material.
After the present invention adopts technique scheme, mainly contain following technique effect:
(1) compare with the ordinary Portland cement stabilization gravel, the present invention has improved the tensile strength of base material, has increased the energy that fracture propagation consumed, fiber can stand out against the drawing effect of external force after producing microcrack, the toughness of material is strengthened, and impact resistance improves, and helps to reduce reflection crack; Material frost resistance, fatigue performance etc. also improve simultaneously, improve the road structure performance.
(2) compare with the PP fiber reinforced cement stabilization gravel, the present invention not only improves the toughness of sub-surface, and the tensile strength of material is improved a lot.
(3) compare with ordinary steel fibre reinforced concrete material, the present invention adopts little steel fibre, the mix Workable, and fiber dispersion is even, satisfies construction requirement easily, and because fibers content reduces, effectively reduces material cost, can be promoted and use.
(4) and the adding of short glass fiber in base material fracture propagation process, makes it form numerous microcracks, further effectively improve the base material impact resistance, increase energy to fracture.
The specific embodiment
Multi-scale fiber reinforced cement stable gravel roadbase material of the present invention is to add 0.8-1.2kg/m in traditional cement stable gravel roadbase material
3Little steel fibre and 0.8-1.2kg/m
3Glass fiber, described little steel fibre diameter 0.1-0.2mm, length 10-20mm, tensile strength 〉=600MPa, elongation rate 〉=35%, described glass fiber diameter 0.02-0.1mm, length 5mm, tensile strength 〉=1.0GPa, limit elongation 〉=3.0%; Cement stabilized macadam is made up of gel rubber material, aggregate and water, and wherein gel rubber material can adopt cement, and consumption is 90～110Kg/m usually
3, being preferably 32.5 Portland cements or portland cement, aggregate is an aggregate chips, consumption is 2100～2200Kg/m usually
3
Below provide several embodiment of the little steel fiber reinforced cement stable gravel roadbase material of the present invention, because the consumption of aggregate chips and cement also can influence performance data, and the objective of the invention is to utilize little steel fibre and glass fiber to improve the anti-shrinkage cracking ability and the mechanical property of road surface base layer material, therefore in the following embodiments, every cubic metre of multi-scale fiber reinforced cement stable gravel roadbase material all uses 100kg cement, 2200kg aggregate chips, so that the contrast performance data:
Embodiment 1
Mix little steel fibre 0.8kg, glass fiber 1.2kg in the multi-scale fiber reinforced cement stable gravel roadbase material of every cubic metre of present embodiment.
Embodiment 2
Mix little steel fibre 1.2kg, glass fiber 0.8kg in the multi-scale fiber reinforced cement stable gravel roadbase material of every cubic metre of present embodiment.
Embodiment 3
Mix little steel fibre 1.0kg, glass fiber 1.0kg in the multi-scale fiber reinforced cement stable gravel roadbase material of every cubic metre of present embodiment.
Embodiment 4
Mix little steel fibre 1.1kg, glass fiber 0.9kg in the multi-scale fiber reinforced cement stable gravel roadbase material of every cubic metre of present embodiment.
Embodiment 5
Mix little steel fibre 1.0kg, glass fiber 1.2kg in the multi-scale fiber reinforced cement stable gravel roadbase material of every cubic metre of present embodiment.
Comparative examples
Present embodiment is the cement stable gravel roadbase material of adding of fiber material not, comprises 100kg/m
3Cement and 2200kg/m
3Aggregate chips.
To above each embodiment, carry out compaction test according to the compaction test method (T0804-94) of the stabilized with inorganic binder soil in " highway engineering stabilized with inorganic binder material test rules " (JTJ 057-94) and determine maximum dry density and optimum moisture content, every cubic metre of cement stabilized macadam is got the raw materials ready by the design mixture proportion weighing, mix and stir in the process, earlier that fiber, aggregate chips and cement dry mixing is even, add the water uniform mixing then and form compound, test specimen is after blanks and moulding and conserving, by detecting test specimen, obtain following experimental data:
| Comparative examples | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Unconfined compression strength (7d)/MPa | ??4.67 | ?4.70 | ?4.79 | ?4.82 | ?4.77 | ?4.87 |
| Cleavage strength (7d)/MPa | ??0.40 | ?0.49 | ?0.56 | ?0.47 | ?0.52 | ?0.55 |
| Compression rebound modulu (7d)/MPa | ??1905 | ?1873 | ?1963 | ?1950 | ?1890 | ?1935 |
| Energy to failure (N/m) | ??68.3 | ?290.3 | ?270.9 | ?305.0 | ?287.4 | ?317.5 |
From above-mentioned experimental result as can be seen: behind the multiple dimensioned fiber of admixture, the cement stabilized macadam material is improving on the basis of mechanical property, and cracking resistance is improved significantly.
Claims (6)
1. multi-scale fiber reinforced cement stable gravel roadbase material, comprise cement stabilized macadam, it is characterized in that: also comprise multiple dimensioned fibrous material, described multiple dimensioned fibrous material comprises little steel fibre and glass fiber, and the volume of little steel fibre and glass fiber is respectively 0.8-1.2kg/m
3
2. multi-scale fiber reinforced cement stable gravel roadbase material according to claim 1 is characterized in that: described little steel fibre diameter 0.1-0.2mm, length 10-20mm, tensile strength 〉=600MPa, elongation rate 〉=35%.
3. multi-scale fiber reinforced cement stable gravel roadbase material according to claim 1 is characterized in that: described glass fiber diameter 0.02-0.1mm, length 5mm, tensile strength 〉=1.0GPa, limit elongation 〉=3.0%.
4. according to each described multi-scale fiber reinforced cement stable gravel roadbase material in the claim 1 to 3, it is characterized in that: described cement stabilized macadam is made up of gel rubber material, aggregate and water.
5. according to the multi-scale fiber reinforced cement stable gravel roadbase material described in the claim 4, it is characterized in that: described gel rubber material is a cement, and content is 90～110Kg/m
3, aggregate is an aggregate chips, content is 2100～2200Kg/m
3
6. according to the multi-scale fiber reinforced cement stable gravel roadbase material described in the claim 5, it is characterized in that: little volume content of steel fibers is that 1.0kg, glass fiber volume are 1.2kg in every cubic metre of multi-scale fiber reinforced cement stable gravel roadbase material.
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| CN200910190976A CN101660287A (en) | 2009-09-25 | 2009-09-25 | Multi-scale fiber reinforced cement stable gravel roadbase material |
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| CN200910190976A CN101660287A (en) | 2009-09-25 | 2009-09-25 | Multi-scale fiber reinforced cement stable gravel roadbase material |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503312A (en) * | 2011-11-10 | 2012-06-20 | 安徽省交通规划设计研究院 | Polyvinyl alcohol fiber-reinforced cement stabilized macadam pavement base material |
| CN107056097A (en) * | 2017-06-06 | 2017-08-18 | 肥西县碧涛建材有限公司 | A kind of glass fiber reinforced cement and preparation method thereof |
| CN107445560A (en) * | 2017-09-11 | 2017-12-08 | 苏州东振路桥工程有限公司 | A kind of cement stabilized macadam |
| CN108503301A (en) * | 2018-03-30 | 2018-09-07 | 扬州惠民再生资源有限公司 | A kind of high-strength cracking resistance recycled cement stabilization gravel material and preparation method thereof |
| CN109342249A (en) * | 2018-12-05 | 2019-02-15 | 郑州大学 | Polypropylene Fiber Reinforced Cement Stabilized Macadam shrinkage test method |
| CN109837814A (en) * | 2019-02-25 | 2019-06-04 | 山东省交通科学研究院 | A kind of soft or hard building stones are mixed with Cement Stable Macadam Mixture and its application |
| CN114409333A (en) * | 2022-01-12 | 2022-04-29 | 东南大学 | Steel fiber lightweight aggregate cement stabilized macadam and preparation process thereof |
-
2009
- 2009-09-25 CN CN200910190976A patent/CN101660287A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102503312A (en) * | 2011-11-10 | 2012-06-20 | 安徽省交通规划设计研究院 | Polyvinyl alcohol fiber-reinforced cement stabilized macadam pavement base material |
| CN107056097A (en) * | 2017-06-06 | 2017-08-18 | 肥西县碧涛建材有限公司 | A kind of glass fiber reinforced cement and preparation method thereof |
| CN107445560A (en) * | 2017-09-11 | 2017-12-08 | 苏州东振路桥工程有限公司 | A kind of cement stabilized macadam |
| CN108503301A (en) * | 2018-03-30 | 2018-09-07 | 扬州惠民再生资源有限公司 | A kind of high-strength cracking resistance recycled cement stabilization gravel material and preparation method thereof |
| CN109342249A (en) * | 2018-12-05 | 2019-02-15 | 郑州大学 | Polypropylene Fiber Reinforced Cement Stabilized Macadam shrinkage test method |
| CN109837814A (en) * | 2019-02-25 | 2019-06-04 | 山东省交通科学研究院 | A kind of soft or hard building stones are mixed with Cement Stable Macadam Mixture and its application |
| CN114409333A (en) * | 2022-01-12 | 2022-04-29 | 东南大学 | Steel fiber lightweight aggregate cement stabilized macadam and preparation process thereof |
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