CN109459383B - Method for judging adhesiveness of stone and asphalt - Google Patents
Method for judging adhesiveness of stone and asphalt Download PDFInfo
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- CN109459383B CN109459383B CN201811497780.XA CN201811497780A CN109459383B CN 109459383 B CN109459383 B CN 109459383B CN 201811497780 A CN201811497780 A CN 201811497780A CN 109459383 B CN109459383 B CN 109459383B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 61
- 239000004575 stone Substances 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000000203 mixture Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 19
- 229910052681 coesite Inorganic materials 0.000 claims description 16
- 229910052906 cristobalite Inorganic materials 0.000 claims description 16
- 229910052682 stishovite Inorganic materials 0.000 claims description 16
- 229910052905 tridymite Inorganic materials 0.000 claims description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 15
- 239000000377 silicon dioxide Substances 0.000 claims description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- 150000004706 metal oxides Chemical class 0.000 claims description 13
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- 229910052755 nonmetal Inorganic materials 0.000 claims description 9
- 206010040844 Skin exfoliation Diseases 0.000 claims description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 238000009835 boiling Methods 0.000 description 9
- 238000004737 colorimetric analysis Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000006028 limestone Substances 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- YXFVVABEGXRONW-UHFFFAOYSA-N toluene Substances CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052752 metalloid Inorganic materials 0.000 description 1
- 150000002738 metalloids Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for judging the adhesiveness of stone and asphalt, which comprises the following steps: acquiring data of a plurality of oxide compositions of a stone sample; calculating the relative pH value K of the stone sample according to the data of the various oxide components; and judging the adhesiveness of the stone material and the asphalt based on the absolute value of the relative pH value K. The method can quickly, simply and accurately judge the adhesion between the aggregate and the asphalt, and has the advantages of simplicity, reliability and strong practicability.
Description
Technical Field
The invention relates to the field of material performance inspection, in particular to a method for judging the adhesiveness of stone and asphalt.
Background
The main cause of water damage to asphalt pavement is the two-way destructive effect of water soaking between the aggregate and the asphalt film of the asphalt mixture: the adhesion of the asphalt to the mineral aggregate is reduced; the adhesion between the asphalt mixtures is destroyed. Therefore, it is important to test the adhesion between aggregate and asphalt, and when the adhesion is not good, a method of adding an anti-stripping agent should be used to improve the adhesion between aggregate and asphalt as much as possible.
The existing standard test in China adopts a boiling method to evaluate the adhesiveness of asphalt and aggregate, and the test methods mentioned in related researches also comprise a gravimetric method, an NAT test method and a photoelectric colorimetric method.
One-step water boiling method
The water boiling method prescribed in the highway engineering asphalt and asphalt mixture test regulation (JTJ016-1993) in China is to select clean and dry 9.5-13.2mm coarse aggregates with equal grain size, immerse the coarse aggregates into hot asphalt for wrapping for 45s, then take out the coarse aggregates for cooling for 15min, immerse the coarse aggregates into slightly boiling distilled water for boiling for 3min after cooling so as to accelerate the peeling action of water on asphalt and aggregates, and then observe the peeling state of asphalt on the surfaces of the aggregates so as to evaluate the adhesiveness of the asphalt and the aggregates.
Second, gravimetric method
Based on a method for testing the adhesiveness of asphalt and coarse aggregates in road engineering asphalt and asphalt mixture test regulations (JTGE20-2011), the method comprises the following main test steps: cleaning 5 aggregates with regular shapes, and drying; numbering and weighing W0; heating the asphalt to 165 ℃, putting the prepared aggregate into the asphalt, taking out the aggregate after 45s, cooling the aggregate for 15min at room temperature, and weighing W1; then, the mixture was boiled in slightly boiling water for 3min, dried at room temperature for 24 hours, and weighed as W2. The asphalt exfoliation rate Pd is: pd ═ 100% of (1-W2-W0W 2-W1).
Third, NAT method
In the test method, a certain size fraction of aggregate is placed in a bitumen-toluene solution for a period of time for circulating reflux, and a part of bitumen is adsorbed on the surface of the aggregate. Thereafter, a quantity of water is added to the asphalt-toluene solution to allow the water to displace the asphalt adsorbed on the aggregate surface. The absorbance of the solution is measured by a photoelectric spectrophotometer, the adsorption quantity of the aggregate to the asphalt and the stripping quantity of the asphalt after water is added can be calculated, and the stripping rate or the adsorption rate of the asphalt stripped from the surface of the aggregate can be calculated.
Fourth, photoelectric colorimetric method
The photoelectric colorimetry is based on that in a system of asphalt-water-aggregate, the displacement action of water on the asphalt can make the asphalt produce stripping or peeling phenomenon from the surface of aggregate, and the dye is used as tracing action, when the dye is come into the interface of asphalt and aggregate along with water, it can be adsorbed on the surface of aggregate. The dye adsorption on the aggregate surface increases with time, while the dye concentration in the solution becomes smaller and smaller until adsorption equilibrium is reached. The extent to which the bitumen membrane is displaced by water over a given period of time, causing it to peel-off from the aggregate surface, can be characterized by the amount of dye adsorbed on the aggregate surface.
However, the above solutions have disadvantages, mainly:
the subjectivity of people is large in the boiling method test process, the generated error is large, and the asphalt peeling rate cannot be quantitatively analyzed; errors are easily generated in the process of coating asphalt and boiling by a gravimetric method; both the photoelectric colorimetry and the NAT method are complicated to operate.
In addition to the four methods for testing adhesion directly by experiment, there is a simple determination method based on rock pH, which is generally considered that aggregates with strong alkalinity have good adhesion to asphalt and acidic aggregates have poor adhesion to asphalt, for example, according to Si02Rough determination of the content, rough determination based on the base number, and rough determination based on the Rettman index (the Rettman index calculation formula is σ ═ (K)2O+Na2O)2/(SiO2-43))。
However, the above method has a theoretical error, and the result of theoretical calculation using the above method does not match the actual situation. E.g. Si0 of limestone2Low content of basalt Si02The content is medium, the adhesiveness of basalt to aggregate is poorer than that of limestone to aggregate according to the theory, but the actual condition is that the adhesiveness of basalt to aggregate is poorer than that of limestone to aggregateThe adhesion is good.
Disclosure of Invention
In order to overcome the defects, the invention provides a method for judging the adhesiveness of stone and asphalt, so long as the data of various oxide components of the stone are measured in advance, the adhesion test is not needed, and the method is simple and reliable and has strong practicability.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for determining stone adhesion to asphalt comprising the steps of:
acquiring data of a plurality of oxide compositions of a stone sample;
calculating the relative pH value K of the stone sample according to the data of the various oxide components;
and judging the adhesiveness of the stone material and the asphalt based on the absolute value of the relative pH value K.
Further, the oxide composition data is the content of oxides in the stone sample;
further, the oxides include metal oxides and non-metal oxides;
the calculating the relative pH value K of the stone sample according to the contents of the various oxides comprises the following steps:
k% — content of metal oxide-content of metalloid oxide.
Further, the metal oxide includes: al (Al)2O3、Fe2O3、K2O、Na2O, CaO, MgO and TiO2The non-metal oxide comprises SiO2And CO2。
Further, the calculating the relative pH value K of the stone sample according to the plurality of oxide composition data comprises:
K％＝(Al2O3content + Fe2O3Content + K2O content + Na2O content + CaO content + MgO content + TiO2Content) - (SiO2Content + CO2Content);
wherein the content of each oxide is the ratio of the weight of the oxide to the weight of the stone sample, expressed as a percentage.
Further, the determining the stone-to-asphalt adhesiveness based on the absolute value of the relative ph K includes:
the closer the absolute value of K is to 1, the better the stone-to-asphalt adhesion.
Further, if the absolute value of K is larger than 15, the anti-peeling treatment is performed.
The method of the invention does not need to carry out complex test operation, can judge the adhesion between the stone and the asphalt by only measuring the data of various oxide components of the stone in advance and calculating the relative pH value according to the content of the oxide components in the stone, and has the advantages of rapidness, simplicity, reliable conclusion and strong practicability.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail with reference to specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The invention provides a method for quickly and simply judging the adhesiveness of stone and asphalt, which comprises the following steps:
and S11, acquiring the data of a plurality of oxide compositions of the stone sample.
The oxide composition data can be obtained by measuring or calculating a stone sample by using an existing measuring method. Optionally, the oxide composition data is the content of oxides in the stone sample, e.g. the ratio of the weight of oxides to the weight of the stone sample, expressed as a percentage.
And S12, calculating the relative pH value K of the stone sample according to the various oxide composition data.
The relative pH value is not the real pH value of the stone sample, but is calculated according to the compositions of different types of oxides, and the data is related to the adhesion between the stone and the asphalt.
Further, the oxides include metal oxides and non-metal oxides;
the relative pH value K is the content of the metal oxide minus the content of the nonmetal oxide, namely K percent is the content of the metal oxide-the content of the nonmetal oxide. And S13, judging the adhesiveness of the stone material and the asphalt based on the absolute value of the relative pH value K.
When the absolute value of the calculated relative pH value K is closer to a preset value, the better the adhesiveness between the stone of the type corresponding to the stone sample and the asphalt is; or comparing the absolute value of the relative pH value K with a preset table to determine the degree of the adhesiveness of the stone material and the asphalt.
In addition, the relative pH value K can be calculated in other ways as long as the difference between the content of the metal oxide and the content of the nonmetal oxide can be represented.
The implementation of the above method is described in detail below by means of a specific example:
obtaining Al in stone samples2O3、Fe2O3、K2O、Na2O、CaO、MgO、TiO2、SiO2And CO2Content (c); the content is the ratio of the weight of the oxides to the weight of the stone sample, expressed in percentage.
In stone material, CaO is actually CaCO3In the form of 44 parts of CO per 56 parts by mass of CaO calculated on the basis of the molecular weight2And (4) quality. Therefore, when the content of the non-metallic oxide is obtained, CO2Is not measured directly but is calculated on the basis of the CaO content, i.e. CO2Content ═ (44 × CaO content)/56. The relative ph K of the stone sample was calculated according to the following formula:
K％＝(Al2O3content + Fe2O3Content + K2O content + Na2O content + CaO content + MgO content + TiO2Content) - (SiO2Content + CO2Content) ═ Al (Al)2O3Content + Fe2O3Content + K2O content + Na2O content + CaO content + MgO content + TiO2Content) - (SiO2Content + CaO content 44/56);
the closer the absolute value of K is to 1, the better the adhesiveness between the stone and the asphalt is; the further away from 1, the poorer the stone-to-asphalt adhesion.
If the absolute value of K is greater than 15, the anti-peeling treatment is performed.
The effect of the method of the invention was verified experimentally as follows:
3 different stone samples were prepared, numbered 1#, 2# and 3 #. The chemical composition test was carried out, wherein the oxide contents are shown in tables 1, 2 and 3, respectively.
TABLE 1
Rock composition # 1 (data detected as oxides) (%)
| Sample numbering | SiO2 | Al2O3 | Fe2O3 | K2O | Na2O | CaO | MgO | TiO2 |
| 1# | 59.86 | 11.73 | 2.32 | 3.64 | 3.68 | 9.22 | 0.93 | 0.207 |
TABLE 2
2# rock composition (data measured as oxides) (%)
| Sample numbering | SiO2 | Al2O3 | Fe2O3 | K2O | Na2O | CaO | MgO | TiO2 |
| 2# | 10 | 2.5 | 2 | 1.0 | 0.7 | 55 | 2.5 | 2.42 |
TABLE 3
3# rock composition (data detected as oxide) (%)
| Sample numbering | SiO2 | Al2O3 | Fe2O3 | K2O | Na2O | CaO | MgO | TiO2 |
| 3# | 43.71 | 15.24 | 13.38 | 2.24 | 4.34 | 8.99 | 6.60 | 2.42 |
By way of comparison, according to the prior art, according to SiO2According to the method for judging the adhesiveness, the 1# stone has the highest acidity and the worst adhesiveness with the asphalt, the 2# stone has the highest alkalinity and the best adhesiveness with the asphalt, and the 3# stone is centered. However, the actual results obtained after the tests according to the standard test method for adhesion rating specified in the road engineering profession are shown in Table 4. It can be seen from this that the SiO2The method of content determination of adhesiveness is erroneous. Table 4 shows the measured SiO2The relationship between the content and the adhesion grade.
TABLE 4
| Stone numbering | SiO2Content (%) | Adhesion rating |
| 1# | 59.86 | 2 |
| 2# | 10 | 3 |
| 3# | 50.33 | 4 |
Table 5 shows the case of judgment according to the method of the present invention. And judging according to the distance between the absolute value of the relative pH value K and the numerical value 1, the stone 3# has the best adhesion with the asphalt, the stone 1# is the worst, and the stone 2# is centered. This conclusion corresponds to the adhesion grade obtained by the boiling method test specified by the highway engineering professional specifications, and it can be seen that the method of the present invention can correctly reflect the adhesion between stone and asphalt.
TABLE 5
Therefore, the method can quickly, simply and accurately judge the adhesion degree of the stone and the asphalt without carrying out complicated test actions, avoids the interference of human factors on test results, and is a practical qualitative and rough judgment method.
It is to be emphasized that: the above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A method of determining stone adhesion to asphalt, comprising:
acquiring data of a plurality of oxide compositions of a stone sample;
calculating the relative pH value K of the stone sample according to the data of the various oxide components;
judging the adhesiveness of the stone material with the asphalt based on the absolute value of the relative pH value K;
wherein the oxide composition data is the content of oxides in the stone sample;
the oxides include metal oxides and non-metal oxides;
the calculating the relative pH value K of the stone sample according to the contents of the various oxides comprises the following steps:
k% = content of metal oxide-content of non-metal oxide;
the metal oxide includes: al (Al)2O3 、Fe2O3、K2O、Na2O, CaO, MgO and TiO2The non-metal oxide comprises SiO2And CO2；
The calculating the relative pH value K of the stone sample according to the plurality of oxide composition data comprises the following steps:
K%=(Al2O3content + Fe2O3Content + K2O content + Na2O content + CaO content + MgO content + TiO2Content) - (SiO2Content + CO2Content); wherein the content of each oxide is the ratio of the weight of the oxide to the weight of the stone sample, expressed in percentage;
the determining the adhesiveness of the stone material to the asphalt based on the absolute value of the relative pH value K includes:
the closer the absolute value of K is to 1, the better the stone-to-asphalt adhesion.
2. The method according to claim 1, wherein if the absolute value of K is greater than 15, an anti-peeling treatment is performed.
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|---|---|---|---|---|
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