CN109115672B - Method for evaluating permeability of asphalt pavement regeneration seal material - Google Patents
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Abstract
The invention discloses a method for evaluating the permeability of an asphalt pavement regenerated seal material, which is characterized in that molten aged asphalt is placed in an aluminum skin test tube, and the regenerated seal material is added after the aluminum skin test tube is cooled, so as to simulate the condition that the asphalt pavement is sprayed with the regenerated seal material, and form a test tube sample; because the aluminum skin is easy to shear, the section of the test tube sample is cut simply and conveniently; according to the invention, the penetration and diffusion of the regenerated sealing layer material are accelerated by heating the test tube sample, so that the penetration performance result is rapidly obtained; the corresponding pavement material permeated with the regenerated seal material is obtained by shearing the corresponding section, so that the permeability evaluation of different regenerated seal materials can be carried out on the permeability under the same condition, and the evaluation index is more scientific and reliable; the method uses the softening point descending speed of the test sample to represent and evaluate the permeability of the material, so that the evaluation index is concise, easy to implement and convenient to popularize.
Description
The technical field is as follows:
the invention relates to a test method for evaluating the permeability effect of an asphalt pavement regenerated seal material, belongs to the technical field of road pavement material performance test methods, relates to a test method for the performance of the asphalt pavement regenerated seal material, and particularly relates to a method for evaluating the permeability of the asphalt pavement regenerated seal material.
Background art:
in order to prolong the service life of the road surface, improve the performance of the road surface, reduce the delay of driving and ensure the benefit-cost ratio of maintenance measures, necessary maintenance investment and maintenance activities are generally required to be carried out on the existing road. Maintenance work on asphalt pavements can be generally divided into preventive maintenance and corrective maintenance. Corrective maintenance, which is a maintenance operation for repairing local damage of a road surface or for some specific diseases in the conventional sense, is usually applied to the condition that a local structural damage of the road surface has occurred, but the overall situation is not reached, and obviously, the corrective maintenance is a subsequent passive maintenance mode, and various local diseases are accumulated to form a global structural damage, thereby finally resulting in an expensive repair (overhaul) project. Preventive maintenance is a planned maintenance strategy based on a cost-benefit ratio for existing road systems, which is undertaken in the case of good road surface conditions. The method delays the damage of the road surface under the condition of not improving the bearing of the road surface structure, maintains or improves the existing traffic conditions of the road surface, delays expensive overhaul and reconstruction activities by prolonging the service life of the original road surface, and is generally suitable for the road surface without damage or slight defects and diseases. It can also be said that preventive maintenance means that the most appropriate preventive maintenance measures are applied at the most appropriate timing at the initial stage of the decay of the road use condition, so as to maximally delay the road condition degradation with the minimum life cycle cost.
Technologies such as regeneration seal, fog seal, and leaching regeneration are common preventive maintenance measures. Through spraying bituminous paving with regeneration seal material, fog seal material and drop reclaimed material, and then inside the infiltration entering road surface: the loss of the active ingredients of the asphalt of the pavement surface can be supplemented, and the original balance of each component of the asphalt is restored, so that the flexibility and elasticity of the asphalt are restored, and the overall performance of the asphalt mixture is improved; secondly, the early aging diseases of the pavement, such as capillary cracks, looseness, segregation, pitted surface, oil shortage, white color and the like, can be repaired, and the service life of the pavement is prolonged; and thirdly, the pavement surface layer asphalt is softened and expanded under the action of the regenerated seal material, so that gaps in the pavement surface structure are filled, the oxidation and the erosion of air and water to the pavement surface layer and the lower surface layer are effectively isolated, and the waterproof and ultraviolet-resistant sealing effect of the pavement is achieved. The basic premise for these materials and technologies to function is that they must have good permeability properties to penetrate into the interior of the asphalt pavement. Poor permeability can result in material retention on the road surface, reducing road construction depth, thereby affecting road skid resistance and hindering traffic safety.
At present, no evaluation method for the performance of the permeation capability (diffusion capability) of the regenerated sealing layer material exists, so that the performance of different regenerated sealing layer materials is difficult to be judged uniformly and accurately.
The invention content is as follows:
the invention provides a method for evaluating the permeability of a regenerated sealing material of an asphalt pavement, which aims to solve the problems in the prior art. The technical scheme is as follows:
the evaluation method comprises the following steps:
1) taking N +1 aluminum skin test tubes, adding the molten aged asphalt into each aluminum skin test tube, standing vertically and naturally cooling to room temperature; scale h for marking depth of surface of aged asphalt after cooling from pipe orifice of aluminum skin test pipeaFrom h to haMarking a starting scale h 5-10mm downwards0From h to h0Downward 30mm-50mm mark intercepting scale h1；
2) Adding an evaporation residue of an oily regeneration seal material or an aqueous regeneration seal material into each cooled aluminum skin test tube to obtain N +1 test tube samples;
3) heating N test tube samples in heating equipment at 80-140 ℃, wherein the heating time is t1、t2、……、tNN is the number of the test tube samples placed in the heating equipment, and the heating time of a test tube sample not placed in the heating equipment is recorded as t0，t00; heating, taking out, and naturally cooling to room temperature;
4) intercepting h in each test tube sample0～h1Heating and melting the cut part, stirring and mixing uniformly to form N +1 test samples, performing softening point test on each test sample to obtain the softening point Ts of each test sample0、Ts1、Ts2、Ts3、……、TsNAnd calculating to obtain a permeability index PEI for evaluating the permeability of the regenerated sealing layer material according to the following formula:
the invention is further designed in that:
the evaporation residue of the water-based regenerated sealing material is a high-boiling-point oily substance remained after the water of the water-based regenerated sealing material is evaporated.
The aged asphalt is recovered asphalt in an asphalt pavement recovered mixture or asphalt obtained by adopting road petroleum asphalt through a simulated aging process.
The asphalt obtained in the simulated aging process is obtained by putting the road petroleum asphalt into a film oven or a rotary film oven for heating and carrying out pressure aging.
The softening point test is carried out according to T0606-2011 asphalt softening point test in JTG E20-2011 road engineering asphalt and asphalt mixture test specification.
Adding the melted aged asphalt into each aluminum skin test tube to ensure that the capacity of the aluminum skin test tube is 30-90%; the mass ratio of the evaporation residues added with the regenerated seal material to the aged asphalt is 1: 20-3: 10.
The diameter of the aluminum sheet test tube is 25mm, and the length of the aluminum sheet test tube is 140 mm; the mass of the molten aged asphalt added into each aluminum skin test tube is 50 g; the amount of the evaporation residue of the added regeneration seal material was 5 g.
The addition of the melted aged asphalt into each aluminum skin test tube is 60 percent of the capacity of the aluminum skin test tube; the mass ratio of the evaporation residue added with the regenerated seal material to the aged asphalt is 1: 10.
The number N of the test tube samples placed in the heating device is 3-7.
Intercepting h in each test tube sample0～h1Partly by cutting with a heated blade.
Therefore, compared with the prior art, the invention has the following beneficial effects:
the method is characterized in that molten aged asphalt is placed in the aluminum skin test tube, and the regenerated sealing material is added after the aluminum skin test tube is cooled, so that the condition that the regenerated sealing material is spread on an asphalt pavement is simulated, and a test tube sample is formed;
according to the invention, the penetration and diffusion of the regenerated sealing layer material are accelerated by heating the test tube sample, so that the penetration performance result is rapidly obtained; the corresponding pavement material permeated with the regenerated seal material is obtained through the corresponding section of the shear test tube sample, so that the permeability evaluation of different regenerated seal materials can be carried out on the permeability under the same condition, and the evaluation index is more scientific and reliable;
according to the invention, the permeability of the evaluation material is represented by the softening point reduction speed of a test sample according to the positive correlation phenomenon between the permeability of the regenerated seal material and the softening point reduction speed of the aged asphalt under the experimental condition, so that the evaluation index is concise, easy to implement and convenient to popularize.
Description of the drawings:
FIG. 1 is a schematic diagram of a permeation test of a regeneration seal material according to an embodiment;
wherein A is an evaporation residue of the oily or aqueous regenerated seal material; b-aged asphalt.
The specific implementation mode is as follows:
the following examples used five types of regenerated seal materials, RS-1, RS-2, RS-3, RS-4 and RS-5, produced by Suco group Ltd, wherein RS-1, RS-4 and RS-5 were aqueous regenerated seal materials and RS-2 and RS-3 were oily regenerated seal materials. When the aqueous regenerated sealing material is used, the water needs to be evaporated and removed to obtain the corresponding residual high-boiling-point oily substance, namely the evaporation residue of the aqueous regenerated sealing material. The evaporation residue of the aqueous regeneration seal material can be obtained according to the test method of JTG E20-2011 test procedure for road engineering asphalt and asphalt mixture (T0651-1993) test method for the content of the evaporation residue of emulsified asphalt. And (3) evaporating the three aqueous regeneration seal materials to remove water respectively to obtain corresponding residual oily substances with high boiling points, namely the evaporation residues of the aqueous regeneration seal materials.
The following example extracts a sample from the evaporation residue of the aqueous regenerated seal material obtained from the RS-1 regenerated seal material, and marks it as sample one; extracting a sample from the RS-2 oily regeneration seal material, and recording the sample as a second sample; taking a sample from the RS-3 oily regenerated seal material, and recording the sample as a third sample; extracting two samples from the evaporation residue of the water-based regenerated sealing material obtained from the RS-4 regenerated sealing material, and recording the two samples as a fourth sample and a sixth sample; extracting two samples from the evaporation residue of the water-based regenerated sealing material obtained from the RS-5 regenerated sealing material, and marking the two samples as a fifth sample and a seventh sample;
the first embodiment is as follows:
the method for evaluating the permeability of the asphalt pavement regeneration seal material comprises the following specific steps:
1. taking 6 asphalt segregation test aluminum sheet test tubes, wherein the pipe diameter of each aluminum sheet test tube is 25mm, and the length of each aluminum sheet test tube is 140 mm; adding 50g of 160 ℃ aged asphalt A into each asphalt mixture, wherein the aged asphalt A is recycled asphalt in the recycled asphalt mixture of the asphalt pavement and accounts for about 60% of the capacity of the aluminum skin test tube; and vertically placing each aluminum skin test tube and cooling to room temperature to avoid the surface inclination of the aged asphalt after cooling. Then measuring the depth of the pipe orifices to the surface of the cooled aged asphalt by using a vernier caliper, and marking the depth scale h on the outer side of the aluminum skin test pipea(ii) a Then along the depth scale ha5mm downwards is marked as the starting scale h0From h to h0Downwards 30mm is marked as intercepting scale h1As shown in fig. 1.
2. One 5g of sample was added to each of the cooled aluminum skin test tubes to obtain 6 test tube samples.
3. Respectively vertically placing the other 5 test tube samples except one test tube sample in a 100 ℃ oven, wherein the heating and heat preservation time is t1、t2、t3、t4And t5(ii) a Wherein, t11 hour, t22 hours, t33 hours, t44 hours, t55 hours; the heating time of the test tube sample not placed in the oven was recorded as t0，t00 hour; heating, taking out and cooling to room temperature.
4. Intercepting each test tube sample h by a heated high temperature scraper0～h1Moiety, h0～h1The height of part is 30mm, 6 test samples are made; heating to 160 deg.C to melt, stirring, mixing, and testing with reference to T0606-2011 asphalt softening point test (ring and ball method) in JTG E20-2011 road engineering asphalt and asphalt mixture test specification to obtain softening point of each test sample, which is respectively marked as Ts0、Ts1、Ts2、Ts3、Ts4And Ts5. Wherein the softening point of the test sample not placed in the oven is Ts0。
The softening points of the 6 test samples corresponding to sample one are shown in the following table:
and calculating the permeability index PEI of the taken regeneration sealing layer material according to the following formula, wherein the larger the PEI is, the better the permeability is:
permeability index PEI1＝0.9。
Example two:
the method for evaluating the permeability of the asphalt pavement regeneration seal material comprises the following specific steps:
1. taking 6 asphalt segregation test aluminum sheet test tubes, wherein the pipe diameter of each aluminum sheet test tube is 25mm, and the length of each aluminum sheet test tube is 140 mm; adding 50g of 160 ℃ aged asphalt A into each asphalt mixture, wherein the aged asphalt A is recycled asphalt in the recycled asphalt mixture of the asphalt pavement and accounts for about 60% of the capacity of the aluminum skin test tube; and vertically placing each aluminum skin test tube and cooling to room temperature to avoid the surface inclination of the aged asphalt after cooling. Then measuring the depth of the pipe orifices to the surface of the cooled aged asphalt by using a vernier caliper, and marking the depth scale h on the outer side of the aluminum skin test pipea(ii) a Then along the depth scale ha5mm downwards is marked as the starting scale h0From h to h0Downwards 30mm is marked as intercepting scale h1As shown in fig. 1.
2. Two 5g of the sample were added to each of the cooled aluminum skin test tubes to obtain 6 test tube samples.
3. Respectively vertically placing the other 5 test tube samples except one test tube sample in a 100 ℃ oven, wherein the heating and heat preservation time is t1、t2、t3、t4And t5(ii) a Wherein, t11 hour, t22 hours, t33 hours, t44 hours, t55 hours; the heating time of the test tube sample not placed in the oven was recorded as t0，t00 hour; heating, taking out and cooling to room temperature.
4. Intercepting each test tube sample h by a heated high temperature scraper0～h1Moiety, h0～h1The height of part is 30mm, 6 test samples are made; heating to 160 deg.C to melt, stirring, mixing, and testing with reference to T0606-2011 asphalt softening point test (ring and ball method) in JTG E20-2011 road engineering asphalt and asphalt mixture test specification to obtain softening point of each test sample, which is respectively marked as Ts0、Ts1、Ts2、Ts3、Ts4And Ts5(ii) a Wherein the softening point of the test sample not placed in the oven is Ts0；
The softening points of the 6 test samples corresponding to sample two are shown in the following table:
and calculating the permeability index PEI of the taken regeneration sealing layer material according to the following formula, wherein the larger the PEI is, the better the permeability is:
permeability index PEI2＝0.3。
Example three:
the method for evaluating the permeability of the asphalt pavement regeneration seal material comprises the following specific steps:
1. taking 6 asphalt segregation test aluminum sheet test tubes, wherein the pipe diameter of each aluminum sheet test tube is 25mm, and the length of each aluminum sheet test tube is 140 mm; adding 50g of 160 ℃ aged asphalt A into each asphalt mixture, wherein the aged asphalt A is recycled asphalt in the recycled asphalt mixture of the asphalt pavement and accounts for about 60% of the capacity of the aluminum skin test tube; and vertically placing each aluminum skin test tube and cooling to room temperature to avoid the surface inclination of the aged asphalt after cooling. Then measuring the depth of the pipe orifices to the surface of the cooled aged asphalt by using a vernier caliper, and marking the depth scale h on the outer side of the aluminum skin test pipea(ii) a Then along the depth scale ha5mm downwards is marked as the starting scale h0From h to h0Downwards 30mm is marked as intercepting scale h1As shown in fig. 1.
2. Three 5g of the sample was added to each of the cooled aluminum skin test tubes to obtain 6 test tube samples.
3. Respectively vertically placing the other 5 test tube samples except one test tube sample in a 100 ℃ oven, wherein the heating and heat preservation time is t1、t2、t3、t4And t5(ii) a Wherein, t11 hour, t22 hours, t33 hours, t44 hours after，t55 hours; the heating time of the test tube sample not placed in the oven was recorded as t0，t00 hour; heating, taking out and cooling to room temperature.
4. Intercepting each test tube sample h by a heated high temperature scraper0～h1Moiety, h0～h1The height of part is 30mm, 6 test samples are made; heating to 160 deg.C to melt, stirring, mixing, and testing with reference to T0606-2011 asphalt softening point test (ring and ball method) in JTG E20-2011 road engineering asphalt and asphalt mixture test specification to obtain softening point of each test sample, which is respectively marked as Ts0、Ts1、Ts2、Ts3、Ts4And Ts5(ii) a Wherein the softening point of the test sample not placed in the oven is Ts0；
The softening points of the 6 test samples corresponding to sample three are shown in the following table:
and calculating the permeability index PEI of the taken regeneration sealing layer material according to the following formula, wherein the larger the PEI is, the better the permeability is:
permeability index PEI3＝0。
Example four:
the method for evaluating the permeability of the asphalt pavement regeneration seal material comprises the following specific steps:
1. taking 4 asphalt segregation test aluminum sheet test tubes, wherein the pipe diameter of each aluminum sheet test tube is 25mm, and the length of each aluminum sheet test tube is 140 mm; 50g of 160 ℃ aged asphalt A which is recycled asphalt in the recycled asphalt pavement mixture and accounts for about 60 percent of the capacity of the aluminum skin test tube is added into each sample; and vertically placing each aluminum skin test tube and cooling to room temperature to avoid the surface inclination of the aged asphalt after cooling.Then measuring the depth of the pipe orifices to the surface of the cooled aged asphalt by using a vernier caliper, and marking the depth scale h on the outer side of the aluminum skin test pipea(ii) a Then along the depth scale ha5mm downwards is marked as the starting scale h0From h to h0Downwards 30mm is marked as intercepting scale h1As shown in fig. 1.
2. Four 5g of the sample was added to each of the cooled aluminum skin test tubes to obtain 4 test tube samples.
3. Respectively vertically placing the rest 3 test tube samples except one test tube sample in a 100 ℃ oven for heating and heat preservation time t1、t2And t3(ii) a Wherein, t12 hours, t24 hours, t36 hours; the heating time of the test tube sample not placed in the oven was recorded as t0，t00; heating, taking out and cooling to room temperature.
4. Intercepting each test tube sample h by a heated high temperature scraper0～h1Moiety, h0～h1The height of part is 30mm, make 4 test samples; heating to 160 deg.C to melt, stirring, mixing, and testing with reference to T0606-2011 asphalt softening point test (ring and ball method) in JTG E20-2011 road engineering asphalt and asphalt mixture test specification to obtain softening point of each test sample, which is respectively marked as Ts0、Ts1、Ts2And Ts3Wherein the softening point of the test sample not placed in the oven is Ts0；
The softening points of the 4 test samples corresponding to sample four are shown in the following table:
and calculating the permeability index PEI of the taken regeneration sealing layer material according to the following formula, wherein the larger the PEI is, the better the permeability is:
permeability index PEI4＝0.08。
Example five:
the method for evaluating the permeability of the asphalt pavement regeneration seal material comprises the following specific steps:
1. taking 8 asphalt segregation test aluminum sheet test tubes, wherein the pipe diameter of each aluminum sheet test tube is 25mm, and the length of each aluminum sheet test tube is 140 mm; 50g of 160 ℃ aged asphalt A which is recycled asphalt in the recycled asphalt pavement mixture and accounts for about 60 percent of the capacity of the aluminum skin test tube is added into each sample; and vertically placing each aluminum skin test tube and cooling to room temperature to avoid the surface inclination of the aged asphalt after cooling. Then measuring the depth of the pipe orifices to the surface of the cooled aged asphalt by using a vernier caliper, and marking the depth scale h on the outer side of the aluminum skin test pipea(ii) a Then along the depth scale ha5mm downwards is marked as the starting scale h0From h to h0Downwards 30mm is marked as intercepting scale h1As shown in fig. 1.
2. Five 5g of the sample was added to each of the cooled aluminum skin test tubes to obtain 8 test tube samples.
3. Respectively vertically placing the other 7 test tube samples except one test tube sample in a 100 ℃ oven for heating and heat preservation time t1、t2、t3、t4、t5、t6And t7(ii) a Wherein, t10.5 hr, t21 hour, t31.5 hours, t42 hours, t52.5 hours, t63 hours, t73.5 hours; the heating time of the test tube sample not placed in the oven was recorded as t0，t00; heating, taking out and cooling to room temperature.
4. Intercepting each test tube sample h by a heated high temperature scraper0～h1Moiety, h0～h1Part of the height is 30mm, and the preparation method8 test samples; heating to 160 deg.C to melt, stirring, mixing, and testing with reference to T0606-2011 asphalt softening point test (ring and ball method) in JTG E20-2011 road engineering asphalt and asphalt mixture test specification to obtain softening point of each test sample, which is respectively marked as Ts0、Ts1、Ts2、Ts3、Ts4、Ts5、Ts6And Ts7Wherein the softening point of the test sample not placed in the oven is Ts0；
The softening points of the 8 test samples corresponding to sample five are shown in the following table:
and calculating the permeability index PEI of the taken regeneration sealing layer material according to the following formula, wherein the larger the PEI is, the better the permeability is:
permeability index PEI5＝0.57。
By combining example 1, example 2, example 3, example 4 and example 5, the permeability index PEI1＝0.9，PEI2＝0.3，PEI3＝0.0，PEI4＝0.08，PEI50.57. Accordingly, the permeability of the regenerated seal material corresponding to the five groups of samples is judged as follows: RS-1>RS-5>RS-2>RS-4>RS-3。
Example six:
the method for evaluating the permeability of the asphalt pavement regeneration seal material comprises the following specific steps:
1. taking 6 asphalt segregation test aluminum sheet test tubes, wherein the pipe diameter of each aluminum sheet test tube is 25mm, and the length of each aluminum sheet test tube is 140 mm; adding 80g of 160 ℃ aged asphalt into each of the asphalt, wherein the aged asphalt is obtained by adopting road petroleum asphalt through a simulated aging process; the asphalt obtained by simulating the aging process is prepared by putting the road petroleum asphalt into a film ovenAsphalt obtained by heat and further pressure aging accounts for about 90% of the capacity of the aluminum skin test tube; and vertically placing each aluminum skin test tube and cooling to room temperature to avoid the surface inclination of the aged asphalt after cooling. Then measuring the depth of the pipe orifices to the surface of the cooled aged asphalt by using a vernier caliper, and marking the depth scale h on the outer side of the aluminum skin test pipea(ii) a Then along the depth scale ha7mm downwards is marked as the starting scale h0From h to h0Downwards 50mm is marked as an intercepting scale h1。
2. Six 24g samples were added to each aluminum skin test tube after cooling to obtain 6 test tube samples.
3. Respectively vertically placing the other 5 test tube samples except one test tube sample in an oven at 80 ℃, wherein the heating and heat preservation time is t1、t2、t3、t4And t5(ii) a Wherein, t11 hour, t22 hours, t33 hours, t44 hours, t55 hours; the heating time of the test tube sample which is not placed in the oven is recorded as t0, and t0 is 0 hour; heating, taking out and cooling to room temperature.
4. Intercepting each test tube sample h by a heated high temperature scraper0～h1Moiety, h0～h1The height of part is 50mm, make 6 test samples; heating to 160 deg.C to melt, stirring, mixing, and testing with reference to T0606-2011 asphalt softening point test (ring and ball method) in JTG E20-2011 road engineering asphalt and asphalt mixture test specification to obtain softening point of each test sample, which is respectively marked as Ts0、Ts1、Ts2、Ts3、Ts4And Ts5(ii) a Wherein the softening point of the test sample not placed in the oven is Ts0；
The softening points of the 6 test samples corresponding to sample six are shown in the following table:
and calculating the permeability index PEI of the taken regeneration sealing layer material according to the following formula, wherein the larger the PEI is, the better the permeability is:
permeability index PEI for sample six6＝0.1。
Example seven:
the method for evaluating the permeability of the asphalt pavement regeneration seal material comprises the following specific steps:
1. taking 6 asphalt segregation test aluminum sheet test tubes, wherein the pipe diameter of each aluminum sheet test tube is 25mm, and the length of each aluminum sheet test tube is 140 mm; adding 25g of 160 ℃ aged asphalt into each, wherein the aged asphalt is obtained by adopting road petroleum asphalt through a simulated aging process; the asphalt obtained by simulating the aging process is obtained by putting the road petroleum asphalt into a rotary film oven for heating and further carrying out pressure aging, and accounts for about 30% of the capacity of the aluminum skin test tube; and vertically placing each aluminum skin test tube and cooling to room temperature to avoid the surface inclination of the aged asphalt after cooling. Then measuring the depth of the pipe orifices to the surface of the cooled aged asphalt by using a vernier caliper, and marking the depth scale h on the outer side of the aluminum skin test pipea(ii) a Then along the depth scale ha10mm downwards is marked as the starting scale h0From h to h0Is marked with a cutting scale h 40mm downwards1。
2. Seven 1.25g of sample were added to each of the cooled aluminum skin test tubes to obtain 6 test tube samples.
3. Respectively vertically placing the other 5 test tube samples except one test tube sample in a 140 ℃ oven, wherein the heating and heat preservation time is t1、t2、t3、t4And t5(ii) a Wherein, t11 hour, t22 hours, t33 hours, t44 hours, t55 hours; the heating time of the test tube sample not placed in the oven was recorded as t0，t00 hour; heating, taking out and cooling to room temperature.
4. Intercepting each test tube sample h by a heated high temperature scraper0～h1Moiety, h0～h1The height of part is 40mm, make 6 test samples; heating to 160 deg.C to melt, stirring, mixing, and testing with reference to T0606-2011 asphalt softening point test (ring and ball method) in JTG E20-2011 road engineering asphalt and asphalt mixture test specification to obtain softening point of each test sample, which is respectively marked as Ts0、Ts1、Ts2、Ts3、Ts4And Ts5(ii) a Wherein the softening point of the test sample not placed in the oven is Ts0；
The softening points of the 6 test samples corresponding to sample seven are shown in the following table:
and calculating the permeability index PEI of the taken regeneration sealing layer material according to the following formula, wherein the larger the PEI is, the better the permeability is:
permeability index PEI for sample seven7＝0.6。
The above-described embodiments are merely illustrative of the principles of the present invention and its methods, and are not to be construed as limiting the invention. All equivalent modifications or changes of the above-described embodiments which do not depart from the spirit and technical concept disclosed in the present invention should be construed as being covered by the claims.
Claims (10)
1. A method for evaluating the permeability of a recycled seal material of an asphalt pavement is characterized by comprising the following steps: the method comprises the following steps:
1) taking N +1 aluminum skin test tubes, adding the molten aged asphalt into each aluminum skin test tube, standing vertically and naturally cooling to room temperature; aluminum skin test for marking distance between surface of aged asphalt after coolingTest the degree of depth h of tube mouth of pipeaFrom h to haMarking a starting scale h 5-10mm downwards0From h to h0Downward 30mm-50mm mark intercepting scale h1；
2) Adding an evaporation residue of an oily regeneration seal material or an aqueous regeneration seal material into each cooled aluminum skin test tube to obtain N +1 test tube samples;
3) heating N test tube samples in heating equipment at 80-140 ℃, wherein the heating time is t1、t2、……、tNN is the number of the test tube samples placed in the heating equipment, and the heating time of a test tube sample not placed in the heating equipment is recorded as t0，t00; heating, taking out, and naturally cooling to room temperature;
4) intercepting h in each test tube sample0～h1Heating and melting the cut part, stirring and mixing uniformly to form N +1 test samples, performing softening point test on each test sample to obtain the softening point Ts of each test sample0、Ts1、Ts2、Ts3、……、TsNAnd calculating to obtain a permeability index PEI for evaluating the permeability of the regenerated sealing layer material according to the following formula:
wherein N represents the value range of N.
2. The method for evaluating the permeability of the asphalt pavement recycling seal material according to claim 1, characterized by comprising the following steps: the evaporation residue of the water-based regenerated sealing material is a high-boiling-point oily substance remained after the water of the water-based regenerated sealing material is evaporated.
3. The method for evaluating the permeability of the asphalt pavement recycling seal material according to claim 1, characterized by comprising the following steps: the aged asphalt is recovered asphalt in an asphalt pavement recovered mixture or asphalt obtained by adopting road petroleum asphalt through a simulated aging process.
4. The method for evaluating the permeability of the asphalt pavement recycling seal material according to claim 3, characterized by comprising the following steps: the asphalt obtained in the simulated aging process is obtained by putting the road petroleum asphalt into a film oven or a rotary film oven for heating and carrying out pressure aging.
5. The method for evaluating the permeability of the asphalt pavement recycling seal material according to claim 1, characterized by comprising the following steps: the softening point test is carried out according to T0606-2011 asphalt softening point test in JTG E20-2011 road engineering asphalt and asphalt mixture test specification.
6. The method for evaluating the permeability of the asphalt pavement recycling seal material according to claim 1, characterized by comprising the following steps: adding the melted aged asphalt into each aluminum skin test tube to ensure that the capacity of the aluminum skin test tube is 30-90%; the mass ratio of the evaporation residues added with the regenerated seal material to the aged asphalt is 1: 20-3: 10.
7. The method for evaluating the permeability of the asphalt pavement recycling seal material according to claim 5, characterized by comprising the following steps: the diameter of the aluminum sheet test tube is 25mm, and the length of the aluminum sheet test tube is 140 mm; the mass of the molten aged asphalt added into each aluminum skin test tube is 50 g; the amount of the evaporation residue of the added regeneration seal material was 5 g.
8. The method for evaluating the permeability of the asphalt pavement recycling seal material according to claim 5, characterized by comprising the following steps: the addition of the melted aged asphalt into each aluminum skin test tube is 60 percent of the capacity of the aluminum skin test tube; the mass ratio of the evaporation residue added with the regenerated seal material to the aged asphalt is 1: 10.
9. The method for evaluating the permeability of the asphalt pavement recycling seal material according to any one of claims 1 to 8, characterized in that: the number N of the test tube samples placed in the heating device is 3-7.
10. The method for evaluating the permeability of the asphalt pavement recycling seal material according to any one of claims 1 to 8, characterized in that: intercepting h in each test tube sample0～h1Partly by cutting with a heated blade.
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| CN113188971B (en) * | 2021-04-09 | 2022-06-03 | 东南大学 | Non-reactive asphalt regenerant permeability evaluation method |
| CN117054294B (en) * | 2023-10-13 | 2024-01-30 | 哈尔滨工业大学 | Asphalt regenerant diffusion performance testing device and evaluation method |
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