CN103922644A - Method for enhancing asphalt mixture with short fine straw sheets - Google Patents
Method for enhancing asphalt mixture with short fine straw sheets Download PDFInfo
- Publication number
- CN103922644A CN103922644A CN201410086923.3A CN201410086923A CN103922644A CN 103922644 A CN103922644 A CN 103922644A CN 201410086923 A CN201410086923 A CN 201410086923A CN 103922644 A CN103922644 A CN 103922644A
- Authority
- CN
- China
- Prior art keywords
- aggregate
- asphalt
- short thin
- pitch
- sheet
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Road Paving Structures (AREA)
Abstract
The invention discloses a method for enhancing an asphalt mixture with short fine straw sheets. The structure and performance of an asphalt mixture are enhanced by matching short fine straw sheet size distribution and aggregate spacing distribution. Based on a microstructure of an asphalt mixture test piece, the method comprises the following steps: statistics of aggregate spacing distribution is carried out firstly; on this basis, size distribution of short fine straw sheets is determined with the combination of a pull-out test; and finally, straw sheets are selected according to the above size distribution to be added into an asphalt mixture. By adhesion, shear lag and bridging effects of the short fine straw sheets in the asphalt mixture and retardation effect on crack propagation of the mixture, the enhancing effect is realized. Problems such as environmental pollution, complex technology, high cost and the like which are caused by present straw fibration can be solved. A new approach is developed for recycling of the crop straws.
Description
Technical field
The present invention relates to a kind of method that strengthens asphalt structure and performance, be specifically related to a kind of method that matches to strengthen asphalt structure and performance by short thin stalk chip size distribution and the distribution of aggregate spacing, relate to stalk recovery and utilization technology.
Background technology
Agricultural crop straw, aboundresources, content of cellulose is high, has the advantages such as intensity is large, density is little, flexible.Stalk is applied to the fields such as chemical industry, building, weaving, exploitation high-performance, eco-friendly green material are one of effective ways realizing stalk resource utilization.Stalk, as reinforcement material, is made stalk/soil composite material with native mix, have stronger compression performance, anti-shear ability and penetrating power, and reinforcement effects is better than mestha.Stalk and cement mixing can be made into the material of construction of the high and low valency environmental protection of intensity.Straw is made to block as shear wall weighting material, can improve the anti-shearing destructiveness of shear wall and ductility.
At present, stalk focuses mostly at the process aspect of stalk fibre with the research of material of construction for road.Conventionally adopt alkaline cooking to extract stalk fibre.From stalk, extract fiber, conventionally need complicated chemical technology, easily produce environmental pollution, and cost is higher, be unfavorable for stalk applying in road field.
Summary of the invention
The object of this invention is to provide a kind of method that short thin stalk sheet strengthens asphalt, utilize short thin stalk chip size to distribute and distribute to match with aggregate spacing and strengthen asphalt structure and performance, to solve stalk in prior art, be used for road material of construction, the environmental pollution that stalk fibre brings, complex process, high in cost of production problem.
For addressing the above problem, the present invention by the following technical solutions:
Short thin stalk sheet strengthens a method for asphalt, is to utilize short thin stalk chip size to distribute and the aggregate spacing enhancing asphalt that matches that distributes, and comprises the steps:
The aggregate spacing of a, bitumen mixture specimen distributes
1), bitumen mixture specimen is cut into slices, obtain bitumen mixture specimen cross section;
2), on bitumen mixture specimen cross section, take cross section geometric centre as initial point, take orthogonal two diameters as x axle and y axle, from initial point, along x, y direction, make one group of parallel lines respectively;
3), with ruler, measure the distance between adjacent aggregate on each parallel lines, go forward side by side line item and statistics, obtain the aggregate spacing distribution situation of bitumen mixture specimen;
B, pull-out test
1), short thin stalk sheet one end is imbedded to being equipped with in the die trial of heated bitumen, different lengths of embedment are set, solidify, maintenance; Wherein, described pitch is consistent with above-mentioned bitumen mixture specimen pitch used;
2), employing universal testing machine pulls short thin stalk sheet, and measures pulling-out force from pitch;
3), according to test-results, pull with the critical length rupturing and determine the best buried depth degree of short thin stalk sheet in pitch;
C, according to the aggregate spacing of bitumen mixture specimen, distribute and add the distribution of sizes that the best buried depth degree of determining with pull-out test is determined the short-and-medium thin stalk sheet of asphalt;
D, get the short thin stalk sheet of pitch, aggregate and above-mentioned distribution of sizes, the short thin stalk sheet asphalt of mixing, wherein, the kind of pitch, aggregate, ratio and above-mentioned bitumen mixture specimen pitch used, aggregate are consistent.
Wherein, in steps d, total volume of the short thin stalk sheet of each distribution of sizes is 0.01%～10% of short thin stalk sheet quality of asphalt mixtures.
The present invention distributes to distribute to match with aggregate spacing by short thin stalk chip size and strengthens asphalt structure and performance, adopts directly the mode of pulverizing, directly adding that stalk is applied in asphalt, and the beneficial effect having comprises:
(1) short thin stalk chip size distributes and matches with aggregate spacing, and short thin stalk sheet reduces the energy release rate of asphalt crack propagation, and the expansion of retardance crackle, really plays reinforced action, has improved the resistance to cleavage of asphalt.The method is adhesion, shear lag, the bridge linking effect in asphalt by short thin stalk sheet, and the retardation effect of compound crack propagation is realized to enhancement.
(2) stalk is directly pulverized, be added directly in asphalt, saved cost, help to solve environmental pollution, complex process, the high in cost of production problem that current stalk fibre brings, for agricultural crop straw is recycled the new approach of opening up.
Accompanying drawing explanation
Fig. 1 is the model schematic diagram that short thin stalk sheet of the present invention strengthens asphalt structure.
Fig. 2 is aggregate distance measurement statistical method schematic diagram of the present invention.
Fig. 3 is stalk buried depth schematic diagram of the present invention.
Fig. 4 is the aggregate spacing statistics (x direction) of the embodiment of the present invention 1.
Fig. 5 is the aggregate spacing statistics (y direction) of the embodiment of the present invention 1.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is done further and explained, but protection scope of the present invention is not limited by embodiment.
From stalk, extract fiber, conventionally need complicated chemical technology, easily produce environmental pollution, and cost is higher, be unfavorable for stalk applying in road field.If can be by stalk after simple crushing, directly add in asphalt, and can significantly improve the pavement performance of asphalt, will significantly improve stalk in the using value in road field, and then burn, reduce environmental pollution, save the consumption of various artificial and natural fibers, for the application of stalk in material of construction provides more valuable new technology reducing peasant.
In asphalt, aggregate is by certain grating interlocking together, and for the compound of determining grating, the distribution of its aggregate spacing is relatively-stationary.Equally, the yardstick of short thin stalk sheet also has certain regularity of distribution, and the distribution of the size distribution of stalk sheet and the aggregate spacing in asphalt is closely related.Theoretical according to short fiber composite material, if the length distribution of short thin stalk sheet in asphalt can distribute and match with aggregate spacing, just can play " reinforcement " effect and compound is formed to resistance and split effect, as shown in Figure 1.Therefore the core methed that, strengthens asphalt structure and performance is in asphalt, to add the reinforcement material that distribution of sizes and aggregate spacing match.
Provided by the inventionly by stalk chip size and aggregate spacing, matched and strengthened the method for asphalt structure and performance, described short thin stalk chip size distributes and is distributed and pull-out test result is comprehensively determined by aggregate spacing.Described aggregate spacing distributes according to the microscopical structure of bitumen mixture specimen, by counting statistics aggregate spacing, obtains.Described short thin stalk sheet is added directly in asphalt.
Specifically comprise the steps:
The aggregate spacing of a, bitumen mixture specimen distributes
1), bitumen mixture specimen is cut into slices, obtain bitumen mixture specimen cross section;
2), on bitumen mixture specimen cross section, take cross section geometric centre as initial point, take orthogonal two diameters as x axle and y axle, from initial point, along x, y direction, at interval of 2mm, make one group of parallel lines respectively, as shown in Figure 2;
3), with ruler, measure the distance between adjacent aggregate on each parallel lines, go forward side by side line item and statistics, obtain the aggregate spacing distribution situation of bitumen mixture specimen;
B, pull-out test
1), short thin stalk sheet one end is imbedded to being equipped with in the die trial of heated bitumen, different lengths of embedment are set, solidify, maintenance, as shown in Figure 3; Wherein, described pitch is consistent with above-mentioned bitumen mixture specimen pitch used;
2), employing universal testing machine pulls short thin stalk sheet, and measures pulling-out force from pitch;
3), according to test-results, pull with the critical length rupturing and determine the best buried depth degree of short thin stalk sheet in pitch;
C, according to the aggregate spacing of bitumen mixture specimen, distribute and add the distribution of sizes that the best buried depth degree of determining with pull-out test is determined the short-and-medium thin stalk sheet of asphalt;
D, get the short thin stalk sheet of pitch, aggregate and above-mentioned distribution of sizes, the short thin stalk sheet asphalt of mixing, wherein, the kind of pitch, aggregate, ratio and above-mentioned bitumen mixture specimen pitch used, aggregate are consistent; Total volume of the short thin stalk sheet of each distribution of sizes is 0.01%～10% of short thin stalk sheet quality of asphalt mixtures.
Embodiment 1
(asphalt type is AC-13C to statistical computation bitumen mixture specimen, according to T0702 compacting process in < < highway engineering pitch and Asphalt Mixture Experiment rules > > (JTGE20-2011), make) aggregate spacing distribute, concrete steps are: first bitumen mixture specimen is cut into slices, obtain bitumen mixture specimen cross section, on this cross section, take cross section geometric center as initial point, take orthogonal two diameters as x axle and y axle, from initial point, respectively along x, y direction is made one group of parallel lines at interval of 2mm.Then, with ruler, measure on each parallel lines the distance between adjacent aggregate go forward side by side line item and statistics, statistics represents with histogram, as shown in Fig. 4 (x direction), Fig. 5 (y direction).
From Fig. 4, Fig. 5: aggregate spacing is close to identical in the distribution of x direction, y direction, show the asphalt for given grating, its aggregate spacing distributes also relatively fixing, and this reasonableness for " distributed and calculated stalk sheet length distribution by aggregate spacing " provides strong proof.
The present embodiment adopts raw then wheat stalk to carry out pull-out test.Determining of Wheat Straw sheet buried depth can obtain by single Wheat Straw sheet pull-out test.Test method is first Wheat Straw to be cut into the long Wheat Straw rod of 50mm, again Wheat Straw rod is cutd open into the Wheat Straw sheet that width is 2mm along its length, then Wheat Straw sheet one end is imbedded to heated bitumen (pitch is consistent with above-mentioned bitumen mixture specimen pitch used), solidified at normal temperatures, maintenance 30min under 5 ℃ of conditions.Finally, from the Wheat Straw sheet the other end, apply pulling force, Wheat Straw sheet is pulled from pitch, and measure pulling-out force, with this, determine boundary strength between Wheat Straw sheet and pitch and the best buried depth of Wheat Straw sheet.Usining respectively 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm carries out pull-out test as Wheat Straw sheet buried depth.Test-results sees the following form:
The withdrawal resistance of Wheat Straw sheet in pitch mainly comes from the friction resistance between Wheat Straw sheet surface and pitch, and Wheat Straw sheet and pitch contact surface are longer, friction resistance is larger, when Wheat Straw sheet buried depth is more shallow, friction resistance not yet reaches Wheat Straw sheet ultimate elongation power, under unidirectional pulling force effect, the complete unsticking of Wheat Straw sheet is in pitch.But when contact surface length surpasses certain value (this test is >=7mm), friction resistance surpasses Wheat Straw sheet ultimate elongation power, and Wheat Straw sheet is not just ruptured before drawing unsticking.Can determine that thus Wheat Straw sheet critical length of unsticking and fracture in pitch is 7mm.
Aggregate spacing distribution statistics result adds the best buried depth of determining with pull-out test and obtains Wheat Straw sheet yardstick grating: 7.5mm and account for 23.81%, 8mm and account for 16.5%, 8.5mm and account for 11.96%, 9mm and account for 8.98%, 9.5mm and account for 8.86%, 10mm and account for 5.43%, 10.5mm and account for 6.65%; All the other are 11mm～15mm, account for respectively few part.Wherein, aggregate spacing distribution statistics result is the mean value of x direction and y direction.
Adopt stalk crasher to make short thin Wheat Straw fragment, and the Wheat Straw sheet of pulverizing is sieved, and classify, identify with standby by length.According to above-mentioned yardstick grating, weigh the short thin Wheat Straw sheet of each level length, and make Wheat Straw sheet bitumen mixture specimen according to T0703 rolling legal system in < < highway engineering pitch and Asphalt Mixture Experiment rules > > (JTGE20-2011).It should be noted that in order to make short thin Wheat Straw sheet mix even, first short thin Wheat Straw sheet is placed in to mixing machine together with aggregate (thickness is gathered materials), after suitably mixing, mixing thoroughly, add again pitch.In the present embodiment, total volume of the short thin Wheat Straw sheet of each distribution of sizes is 0.2% of short thin Wheat Straw sheet quality of asphalt mixtures.The present embodiment Asphalt Mixture type is AC-13C, and mineral aggregate gradation sees the following form, and bitumen aggregate ratio is 5.0%.This example medium pitch is middle extra large 70# pitch, and by Yang Zhourun, raising pavement engineering company limited provides.
Performance test
Adopt three point bending test method, utilize the short thin Wheat Straw sheet bitumen mixture specimen bending strength of universal testing machine test, and evaluate its resistance to cleavage with this.Tested in addition AC-13C plain asphalt compound test specimen girder bending strength, for contrast, test-results sees the following form:
Girder pliability test result shows: the bending tensile strength of short thin Wheat Straw sheet bitumen mixture specimen, stiffness modulus, compared with plain asphalt compound test specimen, all have raising by a relatively large margin, wherein bending tensile strength has improved 9%, and stiffness modulus has improved 6.8%.The anti-cracking performance that the interpolation that shows short thin Wheat Straw sheet makes pitch close material test specimen has obtained enhancing.
According to < < highway engineering pitch and Asphalt Mixture Experiment rules > > (JTGE20-2011), require Wheat Straw sheet bitumen mixture specimen to carry out wheel tracking test, test-results sees the following form:
Wheel tracking test result shows: compare with the common compound test specimen of AC-13C, the dynamic stability of short thin Wheat Straw sheet bitumen mixture specimen has improved 54%, the rut degree of depth has reduced 24%, shows that the interpolation of short thin Wheat Straw sheet makes the high-temperature stability of bitumen mixture specimen obtain very big lifting.This is to be connected between two by stalk sheet due between aggregate and aggregate, and the mutual interlock action of skeleton has obtained reinforcement.
Claims (2)
1. short thin stalk sheet strengthens a method for asphalt, it is characterized in that, utilizes short thin stalk chip size to distribute and the aggregate spacing enhancing asphalt that matches that distributes, and comprises the steps:
The aggregate spacing of a, bitumen mixture specimen distributes
1), bitumen mixture specimen is cut into slices, obtain bitumen mixture specimen cross section;
2), on bitumen mixture specimen cross section, take cross section geometric centre as initial point, take orthogonal two diameters as x axle and y axle, from initial point, along x, y direction, make one group of parallel lines respectively;
3), with ruler, measure the distance between adjacent aggregate on each parallel lines, go forward side by side line item and statistics, obtain the aggregate spacing distribution situation of bitumen mixture specimen;
B, pull-out test
1), short thin stalk sheet one end is imbedded to being equipped with in the die trial of heated bitumen, different lengths of embedment are set, solidify, maintenance; Wherein, described pitch is consistent with above-mentioned bitumen mixture specimen pitch used;
2), employing universal testing machine pulls short thin stalk sheet, and measures pulling-out force from pitch;
3), according to test-results, pull with the critical length rupturing and determine the best buried depth degree of short thin stalk sheet in pitch;
C, according to the aggregate spacing of bitumen mixture specimen, distribute and add the distribution of sizes that the best buried depth degree of determining with pull-out test is determined the short-and-medium thin stalk sheet of asphalt;
D, get the short thin stalk sheet of pitch, aggregate and above-mentioned distribution of sizes, the short thin stalk sheet asphalt of mixing, wherein, the kind of pitch, aggregate, ratio and above-mentioned bitumen mixture specimen pitch used, aggregate are consistent.
2. short thin stalk sheet strengthens a method for asphalt, it is characterized in that, in steps d, total volume of the short thin stalk sheet of each distribution of sizes is 0.01%～10% of short thin stalk sheet quality of asphalt mixtures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410086923.3A CN103922644B (en) | 2014-03-11 | 2014-03-11 | Method for enhancing asphalt mixture with short fine straw sheets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410086923.3A CN103922644B (en) | 2014-03-11 | 2014-03-11 | Method for enhancing asphalt mixture with short fine straw sheets |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103922644A true CN103922644A (en) | 2014-07-16 |
| CN103922644B CN103922644B (en) | 2015-06-17 |
Family
ID=51141075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410086923.3A Expired - Fee Related CN103922644B (en) | 2014-03-11 | 2014-03-11 | Method for enhancing asphalt mixture with short fine straw sheets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103922644B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446159A (en) * | 2014-11-13 | 2015-03-25 | 长安大学 | Preparation method of bamboo fiber modified asphalt mixture |
| CN104446078A (en) * | 2014-12-18 | 2015-03-25 | 长安大学 | Preparation method of straw fibers for enhancing bituminous pavement |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010053014A (en) * | 2008-07-31 | 2010-03-11 | Ube Nitto Kasei Co Ltd | Fiber-reinforced concrete composite material |
-
2014
- 2014-03-11 CN CN201410086923.3A patent/CN103922644B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010053014A (en) * | 2008-07-31 | 2010-03-11 | Ube Nitto Kasei Co Ltd | Fiber-reinforced concrete composite material |
Non-Patent Citations (2)
| Title |
|---|
| 王成启: "骨料粒径对不同几何尺寸纤维混凝土力学性能的影响", 《"全国特种混凝土技术及工程应用"学术交流会暨2008年混凝土质量专业委员会年会》 * |
| 董振英 等: "纤维增强脆性复合材料细观力学若干进展", 《力学进展》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104446159A (en) * | 2014-11-13 | 2015-03-25 | 长安大学 | Preparation method of bamboo fiber modified asphalt mixture |
| CN104446159B (en) * | 2014-11-13 | 2016-07-06 | 长安大学 | A kind of preparation method of bamboo fibre modified asphalt mixture |
| CN104446078A (en) * | 2014-12-18 | 2015-03-25 | 长安大学 | Preparation method of straw fibers for enhancing bituminous pavement |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103922644B (en) | 2015-06-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Aymerich et al. | Effect of reinforcing wool fibres on fracture and energy absorption properties of an earthen material | |
| Fatahi et al. | Mechanical characteristics of soft clay treated with fibre and cement | |
| Hejazi et al. | A simple review of soil reinforcement by using natural and synthetic fibers | |
| CN102503244A (en) | Composition of skeleton interlocking coarse grain-type high-modulus asphalt concrete and determination method thereof | |
| Raj et al. | Coconut fibre-reinforced cement-stabilized rammed earth blocks | |
| O’Kelly | Atterberg limits are not appropriate for peat soils | |
| CN107476464A (en) | Prefabricated assembled combined wall combination connection system and its application construction method | |
| CN104631702A (en) | Cellular biomass round component and preparation method thereof | |
| CN103922644B (en) | Method for enhancing asphalt mixture with short fine straw sheets | |
| Lejano et al. | Investigation of the effects of different natural fibers on the strength of Compressed Stabilized Earth Blocks (Cseb) | |
| Maurya et al. | Review on stabilization of soil using coir fiber | |
| Qu et al. | Function of palm fiber in stabilization of alluvial clayey soil in Yangtze River Estuary | |
| CN101723633A (en) | Self-induced road surface micro-surfacing material and preparation method | |
| Kumar et al. | Use of jute fibre in stone matrix asphalt | |
| Zhang et al. | Preparation and load-deformation characterization of carbon nanotube-reinforced foam concrete | |
| CN207405866U (en) | Precast concrete sandwich heat preservation wallboard and its stainless steel adapting piece | |
| CN105272048A (en) | Strain self-sensing multi-scale carbon-cement composite pavement material capable of melting snow and ice | |
| CN104631704A (en) | Porous FRP or composite bamboo tube biomass hollow raw bamboo cylinder and preparation method thereof | |
| CN204510615U (en) | A kind of cellular FRP bio-matrix plastic mixture cylinder | |
| Yin et al. | Improving the performance of asphalt mixture by addition of short-thin wheat straw pieces | |
| CN102690099B (en) | Application of soil hardener in wall body building of greenhouse | |
| CN104992030A (en) | Testing method for shearing capability numerical value of fiber enhanced cement-based composite material component | |
| de Carvalho et al. | Mechanical behaviour of reinforced sand with natural curauá fibers through full scale direct shear tests | |
| CN203668782U (en) | Structural layer for building frozen soil road | |
| CN104860583A (en) | HiRM regeneration mixing material and applications thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150617 Termination date: 20190311 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |