CN102515629B - Cow dung ash asphalt concrete pavement material and its preparation method - Google Patents
Cow dung ash asphalt concrete pavement material and its preparation method Download PDFInfo
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- CN102515629B CN102515629B CN 201110410889 CN201110410889A CN102515629B CN 102515629 B CN102515629 B CN 102515629B CN 201110410889 CN201110410889 CN 201110410889 CN 201110410889 A CN201110410889 A CN 201110410889A CN 102515629 B CN102515629 B CN 102515629B
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Abstract
The invention discloses a cow dung ash asphalt concrete pavement material and its preparation method. The cow dung ash asphalt concrete pavement material is prepared from the following raw materials of: limestone aggregates, paving asphalt, limestone ore powder and cow dung ash. The preparation method contains the following steps of: firstly calcining cow dung ash at different temperatures, cooling to room temperature, sieving through a square-opening sieve, mixing limestone ore powder and cow dung ash according to a certain volume percentage, stirring limestone aggregates and paving asphalt at a certain temperature, adding a mixture of cow dung ash and limestone ore powder, and finally uniformly stirring. The result shows that pavement properties such as Cantabro flying loss, Marshall stability, dynamic stability, freeze-thaw split intensity ratio and the like of asphalt concrete are obviously raised after the addition of a proper amount of cow dung ash. The low-cost cow dung material is fully utilized, and the cow dung ash asphalt concrete pavement material provided by the invention can satisfy requirements of asphalt concrete pavements.
Description
Technical field
The present invention relates to a kind of asphalt concrete pavement material, particularly a kind of cow dung ash asphalt concrete pavement material and preparation method thereof.
Background technology
Widespread use along with bituminous concrete pavement in highway engineering, the early damage phenomenon of its weather resistance and pavement structure also highlights day by day.The on the-spot investigation result shows, a lot of bituminous highway engineerings are after coming into operation one to two year, even less than in year, its oil mat just produced a large amount of pitted skins, loose, fall the breakoff phenomenons such as grain, purt slurry, hole, hole, check crack, the bituminous concrete internal structure is subject to seriously degrading stripping, and this has become the principal mode that the highway engineering in China bituminous concrete pavement destroys.The service performance of bituminous concrete pavement is seriously undermined, and also greatly shorten its work-ing life, caused serious financial loss and unnecessary waste.
Major cause is, the asphalt mastic in bituminous concrete is comprised of pitch and breeze, is to a certain extent acid, this can cause it with gather materials between the cohesion deficiency, and cause the bituminous concrete pavement failure.Therefore, the acid degree of reduction asphalt mastic is the key that improves the adhesivity of pitch and aggregate Interface and improve Service Performance of Asphalt Pavement.
In recent years, along with the raising of national energy-saving environmental requirement, the application of waste in bituminous concrete pavement more and more was subject to attention both domestic and external, particularly can obviously improve the waste of concrete pavement performance.The main component of cow dung is the inorganic salt such as the Mierocrystalline cellulose, hemicellulose, xylogen, protein, organic matter, urea and the potassium that are not digested by ox, sodium, calcium, magnesium, and is more in NORTHWEST CHINA area quantity; Its main chemical compositions is SiO
2, CaO, Al
2O
3And Fe
2O
3, the chemical composition of this and ordinary Portland cement is similar, and the aqueous solution is alkalescence.
Therefore, the present invention is directed to the characteristics that the infringement phenomenon occurs bituminous concrete pavement, adopt the cow dung ash and replace by a certain percentage limestone dust, the asphalt concrete pavement material of preparation pavement performance excellence.
Summary of the invention
Problem for the concrete road surface damage of background technology medium pitch the object of the invention is to, and a kind of cow dung ash asphalt concrete pavement material of excellent performance is provided.
In order to realize above-mentioned task, the present invention takes following concrete technical solution to be achieved:
A kind of cow dung ash asphalt concrete pavement material is characterized in that, described cow dung ash asphalt concrete pavement material is comprised of following starting material and volume percent thereof:
Limestone aggregate accounts for 89%～89.5%; Limestone dust accounts for 1.5%～5.4%; The cow dung ash accounts for 0.6%～4.5%; Bi tumenf orr oad accounts for 4.5%～5.0%, and wherein to account for raw-material cumulative volume be 6% to limestone dust and cow dung ash volume sum; Above-mentioned raw-material volume percent sum is 100%.
According to one preferred embodiment, described volume of raw material per-cent consists of: limestone aggregate accounts for 89.1%～89.4%; Limestone dust accounts for 1.8%～4.2%; The cow dung ash accounts for 1.8%～4.2%; Bi tumenf orr oad accounts for 4.6%～4.9%, and wherein to account for raw-material cumulative volume be 6% to limestone dust and cow dung ash volume sum; Above-mentioned raw-material volume percent sum is 100%;
According to a most preferred embodiment, described volume of raw material per-cent consists of: limestone aggregate accounts for 89.3%; Limestone dust accounts for 2.4%; The cow dung ash accounts for 3.6%; Bi tumenf orr oad accounts for 4.7%; Above-mentioned raw-material volume percent sum is 100%.
A kind of method for preparing cow dung ash asphalt concrete pavement material of the present invention, the method comprises following technological step:
At first cow dung is calcined under 200 ℃～800 ℃ temperature condition, be cooled to room temperature, and sieve with the 0.075mm square hole sieve and obtain the cow dung ash;
Then according to volume ratio, limestone dust and cow dung ash are fully mixed, wherein limestone dust accounts for starting material cumulative volume 1.5%～5.4%, the cow dung ash accounts for starting material cumulative volume 0.6%～4.5%, and it is 6% that limestone dust and cow dung ash volume sum account for raw-material cumulative volume;
Under 165 ℃ of conditions, limestone aggregate and bi tumenf orr oad are stirred according to volume ratio, wherein limestone aggregate accounts for starting material cumulative volume 89%～89.5%, bi tumenf orr oad accounts for starting material cumulative volume 4.5%～5.0%, add limestone dust and cow dung ash mixture in the mixture that the most backward limestone aggregate and bi tumenf orr oad stir, stirring obtains cow dung ash asphalt concrete pavement material.
Compare with the asphalt concrete performance under existing identical proportioning condition, the performance index such as the Superpave mix-design loss of the cow dung ash bituminous concrete that the present invention makes, Marshall stability, dynamic stability, freeze thawing Ratio of split strength obviously improve, and satisfy " highway engineering pitch and asphalt concrete test rules " (JTJ052-2000) dense-graded asphalt concrete Its Relevant Technology Standards.Therefore, this bituminous concrete can use in road deck fully, and has the advantages such as the waste material of taking full advantage of, saving cost and raising bituminous concrete performance.
Embodiment
Below provide concrete preferred embodiment of the present invention, be used for further illustrating the present invention.These embodiment only are used for those skilled in the art and understand fully the present invention, rather than are used for limiting the scope of the invention.Every carrying out on technical solution of the present invention equivalents or replace all belong to the claimed interest field of the present invention within.
Each starting material are specifically selected:
Gather materials: limestone aggregate, density are 2.553g/cm
3, be 4 grades to the asphalt adhesive grade, crush values is 8.5%, particle diameter is 0.075mm～13.2mm, continuous grading;
Breeze: limestone dust, density are 2.724g/cm
3
Bi tumenf orr oad: Kelamayi 90# pitch, density are 1.102g/cm
3
The cow dung ash: dry cow dung ash, density is 1.139g/cm
3
Cement: composite Portland cement, stability is qualified, and density is 2.550g/cm
3, strength grade is 32.5R, performance index satisfy " general purpose portland cement " (GB 175-2007) requirement.
Aggregate grading is as shown in table 1.
Table 1 aggregate grading table (volume ratio %)
Embodiment 1:
These embodiment starting material make up according to following volume ratio, and limestone aggregate accounts for 89.3%; Limestone dust accounts for 2.4%; The cow dung ash accounts for 3.6%; Bi tumenf orr oad accounts for 4.7%; Above-mentioned raw-material volume percent sum is 100%.
The preparation method of cow dung in this embodiment ash asphalt concrete material comprises the following steps: at first calcine cow dung under 500 ℃ of temperature condition, be cooled to room temperature, and sieve with the 0.075mm square hole sieve and obtain the cow dung ash; Then mix with limestone dust with the grey replace lime stone ore of cow dung powder, and with the cow dung ash; Limestone aggregate and bi tumenf orr oad are stirred under 165 ℃ of conditions, then add cow dung ash and limestone mine powder mixture, stir at last.
Embodiment 2～13:
According to the bituminous concrete of the method Preparation Example 2～13 of describing in embodiment 1, starting material and nominal mix proportion thereof are as shown in table 2.
Table 2 bituminous concrete nominal mix proportion
Experimental example:
Bituminous concrete test specimen to forming in embodiment 1～13 is erected on platform, and at room temperature cooling 24 hours, then (JTJ052-2000) carry out the test of the pavement performance such as concrete Superpave mix-design loss according to " highway engineering pitch and asphalt concrete test rules ", test-results sees Table 3.
Experimental example 1: the mensuration of Superpave mix-design loss
Marshal piece is put into 20 ℃ of Water Tank with Temp.-controlled health 20h, after taking-up, take one by one test specimen quality m
0, a test specimen is put into Los Angeles trier, rotate 300 with the speed of 30r/min and turn, open the trier lid, take out test specimen and fragment, take the residual quality m of test specimen
11. calculate concrete Superpave mix-design loss according to formula.
In formula: m
0The quality of test specimen before-test, g; m
1The residual quality of test specimen after-test, g.
Experimental example 2: the mensuration of Marshall stability
Adopt the marshall compaction instrument, hammer weight 4536g, free-falling height 457.2mm, each hits real 75 times continuously on the test specimen two sides.Test specimen is
101.6mm * h63.5mm right cylinder test specimen.Test its stability with the Marshall stability determinator.
Experimental example 3: the mensuration of dynamic stability
The rut board size is 300mm * 300mm * 50mm.Test rolling instrument and Measuring Device adopt HLR-3 type bituminous concrete rolling forming machine and the dual-purpose wheel rutting test machine in HLR-3 type bituminous concrete water route.It is 42 times/min that experimental wheel comes and goes rolling speed, and test temperature is 60 ℃.
Experimental example 4: the mensuration of freeze thawing Ratio of split strength
The standard cylinder test specimen of Marshall compaction method moulding is adopted in test.Test temperature is 25 ℃, and loading rate is 50mm/min.Test apparatus is that pavement strength instrument and two width are 12.7mm, and inboard radius-of-curvature is the metal bead of 75mm.2. and 3. calculate concrete tensile splitting strength according to formula.
In formula: RT
1-do not carry out the cleavage strength of the 1st group of test specimen of freeze-thaw cycle, MPa; RT
2-stand the cleavage strength of the 2nd group of test specimen of freeze-thaw cycle, MPa; PT
lThe trial load maximum value of 1 group of test specimen of-Di, N; PT
2The trial load maximum value of 2 groups of test specimens of-Di, N; h
1The center line average of 1 group of test specimen of-Di, mm; h
2The center line average of 2 groups of test specimens of-Di, mm.At last, 4. calculate concrete freeze thawing Ratio of split strength according to formula.
In formula: RT
2-stand the tensile splitting strength of the 2nd group of test specimen of freeze-thaw cycle, MPa; RT
1-do not carry out the tensile splitting strength of the 1st group of test specimen of freeze-thaw cycle, MPa.
Table 3 asphaltic concrete road performance test results
Along with the rising of cow dung ash calcining temperature, the pavement performance of bituminous concrete presents the phenomenon that first raises and reduce afterwards; After adding appropriate cow dung ash, admixture cow dung ash is not concrete apparently higher than embodiment 12 for the pavement performance of bituminous concrete, and the bituminous concrete of the concrete pavement performance of part and embodiment 13 admixture cement is suitable; Illustrate that appropriate cow dung ash can obviously improve the pavement performances such as the Superpave mix-design loss of bituminous concrete, Marshall stability, dynamic stability and freeze thawing Ratio of split strength, thereby can further improve concrete use properties.
Claims (6)
1. a cow dung ash asphalt concrete pavement material, is characterized in that, described cow dung ash asphalt concrete pavement material is comprised of following starting material and volume percent thereof:
Limestone aggregate accounts for 89%～89.5%; Limestone dust accounts for 1.5%～5.4%; The cow dung ash accounts for 0.6%～4.5%; Bi tumenf orr oad accounts for 4.5%～5.0%, and wherein to account for raw-material cumulative volume be 6% to limestone dust and cow dung ash volume sum; Above-mentioned raw-material volume percent sum is 100%.
2. cow dung ash asphalt concrete pavement material as claimed in claim 1, is characterized in that, described limestone aggregate accounts for 89.1%～89.4%; Limestone dust accounts for 1.8%～4.2%; The cow dung ash accounts for 1.8%～4.2%; Bi tumenf orr oad accounts for 4.6%～4.9%, and wherein to account for raw-material cumulative volume be 6% to limestone dust and cow dung ash volume sum; Above-mentioned raw-material volume percent sum is 100%.
3. cow dung ash asphalt concrete pavement material as claimed in claim 1 or 2, it is characterized in that: the further preferred volume per-cent of the starting material of described cow dung ash asphalt concrete pavement material consists of:
Limestone aggregate accounts for 89.3%; Limestone dust accounts for 2.4%; The cow dung ash accounts for 3.6%; Bi tumenf orr oad accounts for 4.7%; Above-mentioned raw-material volume percent sum is 100%.
4. a method for preparing the described cow dung ash asphalt concrete pavement material of claim 1-3 any one claim, is characterized in that, the method comprises the following steps:
At first cow dung is calcined under 200 ℃ ~ 800 ℃ temperature condition, be cooled to room temperature, and sieve with the 0.075mm square hole sieve and obtain the cow dung ash;
Then according to volume ratio, limestone dust and cow dung ash are fully mixed, wherein limestone dust accounts for starting material cumulative volume 1.5%～5.4%, the cow dung ash accounts for starting material cumulative volume 0.6%～4.5%, and it is 6% that limestone dust and cow dung ash volume sum account for raw-material cumulative volume;
Under 165 ℃ of conditions, limestone aggregate and bi tumenf orr oad are stirred according to volume ratio, wherein limestone aggregate accounts for starting material cumulative volume 89%～89.5%, bi tumenf orr oad accounts for starting material cumulative volume 4.5%～5.0%, add limestone dust and cow dung ash mixture in the mixture that the most backward limestone aggregate and bi tumenf orr oad stir, stirring obtains cow dung ash asphalt concrete pavement material.
5. the preparation method of cow dung ash asphalt concrete pavement material as claimed in claim 4, is characterized in that, the calcining temperature of described cow dung is preferably 400 ℃ ~ 600 ℃.
6. as claim 4 or 5 preparation method of a described cow dung ash asphalt concrete pavement material of claim wherein, it is characterized in that, the calcining temperature of described cow dung is 500 ℃.
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| CN104591604B (en) * | 2014-12-31 | 2016-07-06 | 长安大学 | A kind of for paved roads antiskid wearing layer bituminous concrete and application |
| CN107445482B (en) * | 2017-08-07 | 2021-01-19 | 昆明理工大学 | Glaze prepared from waste and ceramic preparation method using glaze |
| CN107445519A (en) * | 2017-09-18 | 2017-12-08 | 中交上海三航科学研究院有限公司 | A kind of bituminous concrete and preparation method thereof |
| CN113582572A (en) * | 2021-08-02 | 2021-11-02 | 浙江大学 | Resource utilization method of herbivore excrement in road engineering |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298376A (en) * | 2008-04-24 | 2008-11-05 | 长安大学 | Composite asphalt concrete CAC for normal temperature mixing road and production method thereof |
| CN101736671A (en) * | 2009-12-07 | 2010-06-16 | 长安大学 | Microwave-absorbing asphalt concrete pavement material composition |
| CN101844883A (en) * | 2010-01-28 | 2010-09-29 | 汪超 | Novel composite ecological cement and product application thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298376A (en) * | 2008-04-24 | 2008-11-05 | 长安大学 | Composite asphalt concrete CAC for normal temperature mixing road and production method thereof |
| CN101736671A (en) * | 2009-12-07 | 2010-06-16 | 长安大学 | Microwave-absorbing asphalt concrete pavement material composition |
| CN101844883A (en) * | 2010-01-28 | 2010-09-29 | 汪超 | Novel composite ecological cement and product application thereof |
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