CN113933188A - Test method for freeze-thaw fatigue performance of asphalt concrete with construction waste recycled aggregate - Google Patents
Test method for freeze-thaw fatigue performance of asphalt concrete with construction waste recycled aggregate Download PDFInfo
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- 230000008014 freezing Effects 0.000 claims description 30
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- 238000009661 fatigue test Methods 0.000 claims description 21
- 239000010426 asphalt Substances 0.000 claims description 15
- 239000004567 concrete Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 14
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Abstract
The invention relates to a test method of freeze-thaw fatigue performance of asphalt concrete with construction waste recycled aggregate, which comprises the following steps of S1, preparing a test piece by adopting asphalt concrete with AC-20C median gradation; s2, acquiring hourly temperature, hourly humidity and hourly solar radiation intensity data of the area to be tested within 20 years in a Chinese meteorological data network; s3, calculating the corresponding time-by-time temperature T of the lower surface layer of the asphalt concrete pavementp(. degree. C.) and the maximum daily temperature T is obtainedpmax(° c) and minimum temperature TpminIn (. degree. C.) and Tpmax>0 and Tpmin<0 as a condition for judging the occurrence of freeze-thaw cycles of the asphalt concrete at the depth on the day. The invention not only takes into account compliance with the specificationThe freeze-thaw cycle effect of the regional climate condition has adverse effect on the construction waste recycled aggregate asphalt concrete, and a freeze-thaw cycle test method which is more in line with the actual situation is designed, so that the comprehensive test on the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete is realized.
Description
Technical Field
The invention relates to the technical field of road and environmental engineering, in particular to a test method for freezing and thawing fatigue performance of asphalt concrete with construction waste recycled aggregate.
Background
At present, the application research of construction waste in road engineering mainly focuses on a road base layer, a subbase layer and a roadbed, and good results are obtained. The service life of the asphalt pavement is usually 1-3 years shorter than the design life, most of asphalt pavements from disease generation to gradual loss of service capability are caused by fatigue cracking, and the fatigue property of the asphalt pavement becomes a key factor influencing the service life of the asphalt pavement. Therefore, the fatigue characteristics of the construction waste recycled aggregate asphalt concrete must be studied deeply.
The fatigue characteristic test method and the test conditions are used as variable factors and also have great influence on the fatigue characteristic of the asphalt concrete, a test piece for the asphalt mixture four-point bending fatigue life test in the existing standard JTG E20-2011 road engineering asphalt and asphalt mixture test regulation (T0739-2011) is complex to form, difficult to operate and large in result variability, the test temperature is generally selected to be 15 ℃ or 25 ℃ at room temperature, the test temperature theoretically meets the requirements of local relevant standards, the test method is also designed under the condition of the conventional climate environment, and the influence of the continuous effect of the climate condition in the research area is not considered. At present, no test method for evaluating the fatigue characteristics of the construction waste recycled aggregate asphalt concrete under the condition of an air temperature and climate equivalent test exists, the research is mainly focused on the natural aggregate asphalt concrete, and the test condition simulation is mostly started from the freeze-thaw cycle test condition. Obviously, the freeze-thaw cycling effect has obvious negative effect on the fatigue life of the asphalt concrete, but the existing specification (T0729-2000 in JTG E20-2011) only has the freeze-thaw test condition aiming at the water stability of the asphalt concrete, the test condition of the freeze-thaw fatigue test is not clearly specified, and no method is provided for considering the influence of the continuous effect of the climate condition in a specific area on the fatigue performance of the recycled asphalt concrete of construction waste.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a test method for the freeze-thaw fatigue performance of asphalt concrete with construction waste recycled aggregate.
In order to achieve the purpose, the invention adopts the technical scheme that:
a test method for the freeze-thaw fatigue performance of asphalt concrete with construction waste recycled aggregate comprises the following steps,
s1, replacing LSA coarse aggregate in asphalt concrete by AC-20C median gradation asphalt concrete and construction waste recycled aggregate according to an equal mass substitution mode with the mixing amount of 50%, molding test pieces with a set number according to a method for manufacturing T0736-2011 asphalt mixture rotary compaction test pieces in JTG E20-2011, preserving the molded test pieces at room temperature for 24 hours, and dividing the test pieces with the set number into unfreezing test pieces and freezing-thawing test pieces;
s2, acquiring hourly temperature, hourly humidity and hourly solar radiation intensity data of the area to be tested within 20 years in a Chinese meteorological data network; the data is subjected to measurement unit conversion, and the error or invalid data is eliminated through the quality control code, so that the time-by-time air temperature Ta (DEG C) and the time-by-time solar radiation intensity Q (kW/m) are finally obtained2) Time-lapse humidity ψ (% RH);
s3, calculating the top depth H of the lower surface layer of the asphalt concrete pavement according to the following formula1And a bottom depth H2Respectively corresponding time-by-time temperature Tp(. degree. C.) and the maximum daily temperature T is obtainedpmax(° c) and minimum temperature Tpmin(℃)，
Tp＝-1.227+0.891Ta5+24.858Q5 2-0.007HTa-0.76HQ+0.656H-0.009H2-0.004H3+0.469θm
Wherein Q-hourly solar radiation intensity(kW/m2)；
Ta5-mean temperature (. degree. C.) 5h before;
Q55h average solar radiation intensity (kW/m) before2)；
H-road depth (cm);
θm-average temperature in months (c) for different months;
s4, by Tpmax>0 and Tpmin<0 is taken as a condition for judging the freeze-thaw cycle of the asphalt concrete at the depth on the day, and then the depth of the lower layer of the asphalt concrete pavement is counted to be H1And H2The number of freeze-thaw cycles occurring in the same year, and adding H1And H2Comparing the corresponding times of the freeze-thaw cycles to obtain a depth strongly influenced by the freeze-thaw cycles, determining a temperature interval value of the freeze-thaw cycles with a freeze-thaw occurrence probability of more than 95% in 20 years at the depth as A-B by an accumulative frequency method, and calculating an average relative humidity value psi when the freeze-thaw cycles occur in 20 years according to the occurrence probability distribution of the freeze-thaw cyclesTotal mean of；
S5, performing parameter design on the concrete freezing and thawing testing machine, wherein the freezing temperature is designed to be A, the thawing temperature is designed to be B, and the environment relative humidity is set to be psiTotal mean ofThe number of times of freeze-thaw cycles is set as the total number of times of freeze-thaw cycles occurring within 20 years at a depth strongly influenced by the freeze-thaw cycles, and then the freeze-thaw test piece prepared in the step S1 is placed in a freeze-thaw tester for a freeze-thaw cycle test;
s6, in step S5, selecting a plurality of groups of freeze-thaw test pieces which are subjected to different freeze-thaw cycle times from the concrete freeze-thaw testing machine according to a gradient selection method, wherein the number of the freeze-thaw test pieces in each group is the same;
s7, carrying out indirect tensile fatigue test on the multiple groups of freeze-thaw test pieces prepared in the step S6 and the unfrozen test pieces prepared in the step S1 through an indirect tensile fatigue test device, taking complete fracture of the test pieces as a fatigue damage judgment standard, and finally obtaining freeze-thaw fatigue life values N and freeze-thaw cycle times x of the multiple groups of test pieces, wherein the load cycle times are fatigue lives of the test pieces when the test is finished;
s8, performing nonlinear regression on the freeze-thaw fatigue life values and the freeze-thaw cycle times of the multiple groups of test pieces by using Origin software, wherein a fatigue equation obtained by regression is as follows:
N＝Axb
wherein, N-the freeze-thaw fatigue life (times);
x-number of freeze-thaw cycles (times);
a, b-fatigue equation parameters.
In any of the above solutions, preferably, in step S1, after the test piece is cured at room temperature for 24 hours, a hole is drilled in the center of one of the freeze-thaw test pieces, a thermometer is installed in the drilled hole to detect the temperature inside the test piece, and the freeze-thaw test piece is used as a temperature control standard test piece.
In any of the above embodiments, it is preferable that the top depth H of the lower layer of the asphalt concrete pavement is set at step S314cm, bottom depth H2Is 10 cm.
In any of the above aspects, it is preferable that the condition for switching between the freezing temperature and the thawing temperature in step S5 is one of the following conditions,
4) the detected central temperature of the freeze-thaw test piece reaches the set freezing temperature or melting temperature;
5) the freezing time reaches 8 h;
6) the melting time reaches 4 h.
In any of the above schemes, the temperature gradient of the switching between the freezing temperature and the melting temperature is preferably 5 ℃/h.
In any of the above schemes, preferably, in step S5, a start button of the freeze-thaw testing machine is pressed, the freeze-thaw testing machine automatically performs a freeze-thaw cycle test according to set parameters until reaching a required number of freeze-thaw times, and if the test is temporarily terminated, the freeze-thaw test piece needs to be ensured to be in a frozen state.
In any of the above schemes, preferably, before the indirect tensile fatigue test, the splitting tensile strength corresponding to the test piece made of the asphalt concrete material needs to be determined, the splitting tensile strength is calculated by the following formula,
RT＝0.006287PT/h
wherein R isT-tensile strength at split (Mpa);
PT-maximum value of test load (N);
h-height of the specimen (mm).
In any of the above embodiments, when the indirect tensile fatigue test is performed in step S7, the load control mode of the indirect tensile fatigue test apparatus is the stress control mode, and the stress value is preferably 0.2RTThe loading waveform is a half sine wave and the loading frequency is 10 Hz.
In any of the above schemes, it is preferable that the hourly humidity data obtained in step S2 weight the monthly average humidity according to the probability of freeze-thaw cycles occurring per month, calculate the monthly average relative humidity when freeze-thaw cycles occur per month, sum the monthly average humidity per year and calculate the annual average relative humidity per year, sum the annual average relative humidity per year for 20 years and average the sum to obtain the total average relative humidity ψTotal mean of。
In any of the above embodiments, it is preferable that the test bath and the water bath of the concrete freeze-thaw tester are provided with two thermometers.
Compared with the prior art, the test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete provided by the invention has the following beneficial effects:
compared with the existing test method for evaluating the fatigue performance of the construction waste recycled aggregate asphalt concrete, the test method provided by the invention considers the adverse effect of the freezing and thawing circulation effect conforming to the climatic conditions of a specific area on the construction waste recycled aggregate asphalt concrete, designs the freezing and thawing circulation test method more conforming to the actual condition, and realizes the comprehensive evaluation of the freezing and thawing fatigue performance of the construction waste recycled aggregate asphalt concrete; the freezing and thawing fatigue performance of the asphalt concrete can be estimated; the experimental method has simple steps and good repeatability of the experimental result.
Drawings
FIG. 1 is a grading curve of construction waste recycled aggregate asphalt concrete provided by the invention;
FIG. 2 is a schematic diagram of the process of eliminating the wrong or invalid data by the quality control code when the China meteorological data network acquires the hourly temperature, humidity and solar radiation intensity data according to the invention;
FIG. 3 shows the top depth H of the lower surface layer of the asphalt concrete pavement within 20 years14cm and bottom end face depth H2(ii) a freeze-thaw cycle number profile occurring at 10 cm;
FIG. 4 is a graph of the cumulative frequency method for determining the temperature of the freeze-thaw cycle at a probability of 95%;
FIG. 5 is a graph comparing monthly average relative humidity to the probability of freeze-thaw cycling occurring;
FIG. 6 is a graph of the five asphalt concrete freeze-thaw fatigue life and the number of freeze-thaw cycles;
FIG. 7 is a schematic structural view of the indirect stretch clip mounted to the base;
fig. 8 is a schematic structural diagram of the base in fig. 7.
Detailed Description
In order that the invention may be further understood, the invention will now be described in detail with reference to specific examples.
As shown in fig. 1, an embodiment of the method for testing the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete provided by the invention comprises the following steps,
s1, replacing LSA coarse aggregate in the asphalt concrete by AC-20C median gradation asphalt concrete and construction waste recycled aggregate according to an equal mass substitution mode with the mixing amount of 50%, and determining the oilstone ratio to be 5.0% by Marshall method. Forming a set number of test pieces according to a manufacturing method of a T0736-2011 asphalt mixture rotary compaction test piece in JTGE 20-2011, wherein the size of the test piece is phi 100 x 63.5mm, curing the formed test pieces at room temperature for 24 hours, and dividing the set number of test pieces into a non-freeze-thaw test piece and a freeze-thaw test piece;
wherein, the mass proportion of coarse aggregates with the diameter of 4.75 mm-26.5 mm in the AC-20C median gradation is 59 percent, wherein the mass proportion of screen holes with the diameter of 19mm, 16mm, 13.2mm, 9.5mm and 4.75mm is respectively 5 percent, 10 percent, 14 percent, 10 percent and 20 percent; 36% of fine aggregate with the thickness of 0.075-4.75 mm, wherein the mass of each grade of sieve pore with the thickness of 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm is respectively 11%, 7.5%, 6.5%, 5%, 2.5% and 3.5%; the mass percentage of the mineral powder is 5 percent. The dosage of SK-70 asphalt is 5% of the total mass of the aggregate, and the fine aggregate and the mineral powder are LSA natural aggregates.
50% of the mass of the coarse aggregate in the AC-20C median gradation is replaced by the mass of construction waste recycled aggregate, and the like, wherein the mass proportion of the replaced components is that the mass proportion of the coarse aggregate with 4.75-26.5 mm is 28.5%, the mass proportion of the construction waste recycled aggregate is 28.5%, the mass proportion of the coarse aggregate with meshes of 19mm, 16mm, 13.2mm, 9.5mm and 4.75mm and the mass proportion of the construction waste recycled aggregate are respectively 2.5%, 5%, 7%, 5% and 10%, the mass proportion of the fine aggregate with meshes of 0.075-4.75 mm is 36%, and the mass proportion of the mineral powder is 5%.
S2, acquiring hourly temperature, hourly humidity and hourly solar radiation intensity data of the area to be tested within 20 years in a Chinese meteorological data network; the data is subjected to measurement unit conversion, and the error or invalid data is eliminated through the quality control code, so that the time-by-time air temperature Ta (DEG C) and the time-by-time solar radiation intensity Q (kW/m) are finally obtained2) Time-lapse humidity ψ (% RH); and calculating the average air temperature T of the first 5ha5Average solar radiation intensity Q in the first 5h5。
S3, calculating the top depth H of the lower surface layer of the asphalt concrete pavement according to the following formula1And a bottom depth H2Respectively corresponding time-by-time temperature Tp(. degree. C.) and the maximum daily temperature T is obtainedpmax(° c) and minimum temperature Tpmin(℃)
Tp＝-1.227+0.891Ta5+24.858Q5 2-0.007HTa-0.76HQ+0.656H-0.009H2-0.004H3+0.469θm
Wherein Q-hourly solar radiation intensity (kW/m)2)；
Ta5-mean temperature (. degree. C.) 5h before;
Q5average solar radiation intensity of 5h before(kW/m2)；
H-road depth (cm);
θm-average temperature in months (c) for different months;
s4, by Tpmax>0 and Tpmin<0 is taken as a condition for judging the freeze-thaw cycle of the asphalt concrete at the depth on the day, and then the depth of the lower layer of the asphalt concrete pavement is counted to be H1And H2The number of freeze-thaw cycles occurring in the same year, and adding H1And H2Comparing the corresponding times of the freeze-thaw cycles to obtain a depth strongly influenced by the freeze-thaw cycles, determining a temperature interval value of the freeze-thaw cycles with a freeze-thaw occurrence probability of more than 95% in 20 years at the depth as A-B by an accumulative frequency method, and calculating an average relative humidity value psi when the freeze-thaw cycles occur in 20 years according to the occurrence probability distribution of the freeze-thaw cyclesAverage；
Here, IF (AND (T) is an application term used when it is judged that freeze-thaw cycles occurpmax>0,Tpmin<0) Freeze thawing or freeze thawing absence), judging whether freeze thawing circulation occurs on the day, if T ispmax>0 and Tpmin<And 0, outputting the 'freeze-thaw cycle of the deep asphalt concrete on the current day', otherwise, outputting the 'freeze-thaw cycle of the deep asphalt concrete on the current day'.
Weighting the monthly average humidity according to the probability of freeze-thaw cycles occurring per month according to the hourly humidity data obtained in step S2, calculating the monthly average relative humidity when freeze-thaw cycles occur per month, summarizing the monthly average humidity every year and calculating the annual average relative humidity every year, summarizing and averaging the annual average relative humidity every 20 years, and finally obtaining the total average relative humidity psiTotal mean of。
S5, performing parameter design on the concrete freezing and thawing testing machine, wherein the freezing temperature is designed to be A, the thawing temperature is designed to be B, and the environment relative humidity is set to be psiTotal mean ofThe number of times of freeze-thaw cycles is set as the total number of times of freeze-thaw cycles occurring within 20 years at a depth strongly influenced by the freeze-thaw cycles, and then the freeze-thaw test piece prepared in the step S1 is placed in a freeze-thaw tester for a freeze-thaw cycle test;
s6, in step S5, selecting a plurality of groups of freeze-thaw test pieces which are subjected to different freeze-thaw cycle times from the concrete freeze-thaw testing machine according to a gradient selection method, wherein the number of the freeze-thaw test pieces in each group is the same;
s7, carrying out indirect tensile fatigue test on the multiple groups of freeze-thaw test pieces prepared in the step S6 and the unfrozen test pieces prepared in the step S1 through an indirect tensile fatigue test device, taking complete fracture of the test pieces as a fatigue damage judgment standard, and finally obtaining freeze-thaw fatigue life values N and freeze-thaw cycle times x of the multiple groups of test pieces, wherein the load cycle times are fatigue lives of the test pieces when the test is finished;
s8, performing nonlinear regression on the freeze-thaw fatigue life values and the freeze-thaw cycle times of the multiple groups of test pieces by using Origin software, wherein a fatigue equation obtained by regression is as follows:
N＝Axb
wherein, N-the freeze-thaw fatigue life (times);
x-number of freeze-thaw cycles (times);
a, b-fatigue equation parameters.
In step S1, after the test pieces are cured at room temperature for 24 hours, a hole is drilled in the center of one of the freeze-thaw test pieces, a thermometer is installed in the hole to detect the temperature inside the test piece, and the freeze-thaw test piece is used as a temperature control standard test piece.
In step S3, the top depth H of the lower layer of the asphalt concrete pavement14cm, bottom depth H2Is 10 cm.
In step S5, the condition for switching between the freezing temperature and the thawing temperature is one of the following conditions,
7) the detected central temperature of the freeze-thaw test piece reaches the set freezing temperature or melting temperature;
8) the freezing time reaches 8 h;
9) the melting time reaches 4 h.
The temperature gradient of the switching between the freezing temperature and the melting temperature is 5 ℃/h.
In step S5, a start button of the freeze-thaw testing machine is pressed, the freeze-thaw testing machine automatically performs a freeze-thaw cycling test according to the set parameters until the required number of freeze-thaw times is reached, and if the test is temporarily terminated, the freeze-thaw test piece needs to be ensured to be in a frozen state.
Before carrying out an indirect tensile fatigue test, determining the splitting tensile strength corresponding to a test piece made of an asphalt concrete material, calculating the splitting tensile strength by adopting the following formula, carrying out the test according to T0716-2011 in JTG E20-2011,
RT＝0.006287PT/h
wherein R isT-tensile strength at split (Mpa);
PT-maximum value of test load (N);
h-height of the specimen (mm).
It should be noted that the test pieces made of different asphalt concrete materials have different splitting tensile strengths.
Further, when the indirect tensile fatigue test is performed in step S7, the load control mode of the indirect tensile fatigue test apparatus is the stress control mode, and the stress value is 0.2RTThe loading waveform is a half sine wave and the loading frequency is 10 Hz.
Furthermore, thermometers are placed in a test tank and a water bath box of the concrete freeze-thaw testing machine, and the number of the thermometers in the test tank is two.
In this embodiment, the indirect tensile fatigue test device adopts a UTM-25 universal tester, and includes an environment box, a loading device and a data acquisition system, a base 1 and an indirect tensile fixture are installed in the environment box, the base 1 is fixed on the bottom wall in the environment box, and the indirect tensile fixture clamps a test piece and applies pressure to extrude the test piece through the loading device.
As shown in fig. 7, the interval stretching clamp comprises an upper pressing strip 2, a lower pressing strip 4 and guide posts 3, wherein the upper pressing strip 2 is positioned above the lower pressing strip 4 and fixed with a pressure head on a loading device, the lower pressing strip 4 is installed on a base 1, the guide posts 3 are respectively fixed at two ends of the top of the lower pressing strip, the guide posts 3 penetrate through the upper pressing strip, namely guide holes are formed in the parts of the upper pressing strip corresponding to the guide posts, the guide posts penetrate through the guide holes, and the guide posts can slide up and down in the guide holes. The loading device driving pressure head drives the upper pressing strip to move relative to the lower pressing strip, the test piece is placed between the upper pressing strip and the lower pressing strip, the test piece is extruded under the combined action of the upper pressing strip and the lower pressing strip until the test piece is broken, and indirect tensile fatigue testing is achieved.
Further, as shown in fig. 8, a mounting hole is formed in the base 1, so that the lower pressing strip can be inserted into the mounting hole, at least two threaded holes communicated with the mounting hole are formed in one side wall of the base, a bolt 5 is connected in each threaded hole, and when the lower pressing strip is fixed to the base, the bolt 5 is screwed into each threaded hole and tightly presses the lower pressing strip in the mounting hole, so that the lower pressing strip is clamped on the base, and fixation is completed.
The test of the concrete freeze-thaw fatigue performance is specifically illustrated by the following experimental data.
The AC-20C median gradation commonly adopted by the lower surface layer of the asphalt concrete is selected, the limestone LSA is selected as the natural aggregate and the mineral powder, the No. 70 asphalt is selected as the asphalt, the coarse LSA aggregate in the asphalt concrete is replaced by the construction waste recycled aggregate according to the equal mass substitution mode of 50 percent of the mixing amount due to the density difference of RCA and LSA, and the oilstone ratio is determined to be 5.0 percent by Marshall method. In order to prove the reliability of the test, five construction waste recycled aggregates with the particle size of 5-20mm from five different sources are respectively selected to replace LSA coarse aggregates to form five different asphalt concretes, namely RCA1, RCA2, RCA3, RCA4 and RCA5, the five different asphalt concrete materials are respectively tested as follows, and the table 1 shows the performances of the construction waste recycled aggregates from five different sources:
TABLE 1 Properties of recycled aggregate from construction waste from five different sources
According to the manufacturing method of the T0736-2011 asphalt mixture rotary compaction test piece in JTG E20-2011, 120 test pieces are molded for each asphalt concrete material to form five groups of test pieces, the size of each test piece is phi 100 x 63.5mm, the molded test pieces are maintained at room temperature for 24 hours, the center of one test piece in each group of test pieces is drilled for installing a thermometer, 20 test pieces in each group of test pieces are taken out to be used as unfreezed test pieces, and the remaining 100 test pieces are used as unfrozen test pieces for subsequent freeze-thaw cycle tests.
Acquiring hourly temperature, humidity and solar radiation intensity data of Beijing stations 2000.01.01-2019.12.31 with the area station number of 54511 in a China meteorological data network; the data is converted into metric units and the erroneous or invalid data is rejected by the quality control code, the process is shown in fig. 2.
Calculating required parameters: t isaCurrent air temperature (deg.C); t isa5Mean air temperature (deg.C) for the first 5 h; q is the current solar radiation intensity (kW/m)2)；Q5For the former 5h average solar radiation intensity (kW/m)2) (ii) a H is the pavement depth (cm); thetamTaking the data of 1 st 12 th of 1 st of 2019 as an example, the average air temperature of the calendar months of different months is calculated to obtain various parameters of 12 hours, as shown in table 2:
TABLE 22019 parameters 1 month 1 day 1-12
Substituting each parameter obtained from the above table into T in step S3pIn the calculation formula (2), the time-by-time temperature T is obtainedpThe highest daily temperature T is obtained by comparisonpmaxAnd the lowest temperature Tpmin(ii) a The daily maximum temperature T of 2000.01.01-2019.12.31 is finally obtained by the same calculation methodpmaxAnd the lowest temperature Tpmin。
According to the condition of the number of times of freeze-thaw cycles in the step S4, the top depth H of the lower layer of the asphalt concrete pavement is counted every year14cm and bottom end face depth H2As is apparent from fig. 3, the number of freeze-thaw cycles occurring at a depth of 4cm is more strongly affected by the freeze-thaw cycles than at a depth of 10cm, so that the test is performed using the lower layer at a depth of 4cm, the annual average number of freeze-thaw cycles of the lower layer at a depth of 4cm is 63.35 times, and the distribution of the freeze-thaw cycle temperature at a probability of 95% is determined by the cumulative frequency method, as shown in fig. 4, it can be found that the probability of the freeze-thaw cycles occurring between-8 and 10 ℃ is greater than 95%, and thus the value of the freeze-thaw cycle temperature interval is-8 to 10 ℃, that is, a is-8 and B is 10.
Calculating average humidity of each month in Beijing area in 20 years by using hourly humidity data acquired from China meteorological data network, wherein 2019 is taken as an example for calculation, as shown in Table 3, monthly average humidity is weighted according to the probability of occurrence of freeze-thaw cycles per month, as shown in FIG. 5, monthly average relative humidity when freeze-thaw cycles occur per month is calculated, monthly average humidity is summarized every year and annual average relative humidity is calculated every year, annual average relative humidity of 20 years is summarized and averaged, and finally total average relative humidity psi is obtainedTotal mean of＝47％。
Table 3 humidity data calculation table
The concrete freeze-thaw testing machine is characterized in that thermometers are placed in a test tank and a water bath tank of the concrete freeze-thaw testing machine, two thermometers are placed in the water bath tank, and temperature is placed in a drill hole in a test piece so as to detect the temperature inside the test piece.
Respectively carrying out freeze thawing cycle tests on each group of prepared test pieces, and placing each group of test pieces in a test mold of a concrete freeze thawing testing machine to ensure that the test pieces are placed smoothly; and (4) injecting an antifreezing solution into the test groove, and ensuring that the test mold has no water.
Setting parameters, opening the concrete freezing and thawing testing machine to set parameters: setting the relative humidity of the environment to 47%, the freezing temperature to-8 ℃, the melting temperature to 10 ℃, the temperature gradient to 5 ℃/h, and setting the freeze-thaw cycle 650 times (according to 65 times per year and 20 years of service life of the pavement).
And pressing a starting button of the testing machine, automatically performing a freeze-thaw cycle test by the testing machine according to set parameters until the required freeze-thaw times are reached, and respectively taking out 20 test pieces when the freeze-thaw cycle is performed for 10 times, 50 times, 150 times, 350 times and 650 times.
Before carrying out the indirect tensile splitting fatigue test, the splitting test is carried out on a test piece made of the asphalt concrete material to determine the splitting tensile strength, and the formula R is calculatedT＝0.006287PTThe calculation is performed as per hour.
In order to show that the fatigue equation obtained in the embodiment is effective, five materials including RCA1, RCA2, RCA3, RCA4 and RCA5 are respectively used for testing, and the splitting tensile strength calculated by using five different types of construction waste recycled aggregate asphalt concrete materials is shown in table 4:
TABLE 4 fracture strength of asphalt concrete specimen of construction waste recycled aggregate
Adopting an asphalt concrete indirect tensile fatigue test device to respectively carry out indirect tensile fatigue tests on freeze-thaw test pieces which are not subjected to freeze thawing and are subjected to freeze-thaw cycles for 10 times, 50 times, 150 times, 350 times and 650 times, wherein the test temperature is 8 ℃, and the stress value is 0.2RTThe load control mode is a stress control mode, the loading waveform is a half sine wave, the frequency is 10HZ, the complete fracture of the test piece is taken as the fatigue failure judgment standard, and the number of load cycles is the fatigue life of the test piece when the test is finished. The relationship between the fatigue life and the number of freeze-thaw cycles for five different kinds of asphalt concrete materials is shown in table 5:
TABLE 5 Freeze-thaw fatigue Life and number of freeze-thaw cycles
Performing nonlinear regression on the five kinds of asphalt concrete freeze-thaw fatigue life and the freeze-thaw cycle times by using Origin software, wherein a fatigue equation formula obtained by regression conforms to the fatigue equation of the step S8, the equation fitting parameters are shown in Table 6,
TABLE 6 Freeze-thaw fatigue life and freeze-thaw cycle number equation parameters
The freezing and thawing fatigue performance evaluation method for the construction waste recycled aggregate asphalt concrete establishes a function equation of the freezing and thawing fatigue life and the freezing and thawing cycle times of the construction waste recycled aggregate asphalt concrete, and the difference of the fatigue characteristics of the five construction waste recycled aggregate asphalt concrete mainly exists in the difference of equation parameters A and b. As can be seen from Table 6, all fatigue equations fit the correlation coefficient R2>0.94, illustrating that the equation established in this example is fatigue effective.
The fitted curve of the freeze-thaw fatigue life and the freeze-thaw cycle times of the five kinds of asphalt concrete is shown in fig. 6, obviously, the fatigue life of the asphalt concrete is reduced along with the increase of the freeze-thaw cycles, and a power function relationship exists, the fatigue life of the asphalt concrete after 650 freeze-thaw cycles is only 35% -52% of the original life, and the reduction rate of the fatigue life of the asphalt concrete is gradually reduced along with the increase of the freeze-thaw cycle times. The testing method shows that the influence of the continuous action of the weather conditions on the fatigue performance of the recycled asphalt concrete of the construction waste is huge, and the testing method well reflects the phenomenon.
The method is convenient to operate, simple in steps and good in test result repeatability, the blank that the influence of the continuous freezing and thawing action of the regional climate conditions is not considered in the existing construction waste recycled aggregate asphalt concrete fatigue performance test method is made up, the more accurate estimation of the fatigue life of the construction waste recycled aggregate asphalt concrete is realized, and a solid theoretical support is provided for the application of the construction waste in the asphalt pavement surface course.
It will be understood by those skilled in the art that the present invention includes any combination of the summary and detailed description of the invention described above and those illustrated in the accompanying drawings, which is not intended to be limited to the details and which, for the sake of brevity of this description, does not describe every aspect which may be formed by such combination. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A test method for freezing and thawing fatigue performance of asphalt concrete with construction waste recycled aggregate is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
s1, replacing LSA coarse aggregate in asphalt concrete by AC-20C median gradation asphalt concrete and construction waste recycled aggregate according to an equal mass substitution mode with the mixing amount of 50%, molding a set number of test pieces according to a T0736-2011 asphalt mixture rotary compaction test piece manufacturing method in JTGE 20-2011, preserving the molded test pieces at room temperature for 24 hours, and dividing the set number of test pieces into two types, namely non-freeze-thaw test pieces and freeze-thaw test pieces;
s2, acquiring hourly temperature, hourly humidity and hourly solar radiation intensity data of the area to be tested within 20 years in a Chinese meteorological data network; the data is subjected to measurement unit conversion, and the error or invalid data is eliminated through the quality control code, so that the time-by-time air temperature Ta (DEG C) and the time-by-time solar radiation intensity Q (kW/m) are finally obtained2) Time-lapse humidity ψ (% RH);
s3, calculating the top depth H of the lower surface layer of the asphalt concrete pavement according to the following formula1And a bottom depth H2Respectively corresponding time-by-time temperature Tp(. degree. C.) and the maximum daily temperature T is obtainedpmax(° c) and minimum temperature Tpmin(℃)，
Tp＝-1.227+0.891Ta5+24.858Q5 2-0.007HTa-0.76HQ+0.656H-0.009H2-0.004H3+0.469θm
Wherein Q-hourly solar radiation intensity (kW/m)2)；
Ta5-mean temperature (. degree. C.) 5h before;
Q5average solar radiation intensity (kW) 5h before/m2)；
H-road depth (cm);
θm-average temperature in months (c) for different months;
s4, by Tpmax>0 and Tpmin<0 is taken as a condition for judging the freeze-thaw cycle of the asphalt concrete at the depth on the day, and then the depth of the lower layer of the asphalt concrete pavement is counted to be H1And H2Number of freeze-thaw cycles that occur in the year at the time of treatment, and adding H1And H2Comparing the corresponding times of the freeze-thaw cycles to obtain a depth strongly influenced by the freeze-thaw cycles, determining a temperature interval value of the freeze-thaw cycles with a freeze-thaw occurrence probability of more than 95% in 20 years at the depth as A-B by an accumulative frequency method, and calculating an average relative humidity value psi when the freeze-thaw cycles occur in 20 years according to the occurrence probability distribution of the freeze-thaw cyclesTotal mean of；
S5, performing parameter design on the concrete freezing and thawing testing machine, wherein the freezing temperature is designed to be A, the thawing temperature is designed to be B, and the environment relative humidity is set to be psiTotal mean ofThe number of times of freeze-thaw cycles is set as the total number of times of freeze-thaw cycles occurring within 20 years at a depth strongly influenced by the freeze-thaw cycles, and then the freeze-thaw test piece prepared in the step S1 is placed in a freeze-thaw tester for a freeze-thaw cycle test;
s6, in step S5, selecting a plurality of groups of freeze-thaw test pieces which are subjected to different freeze-thaw cycle times from the concrete freeze-thaw testing machine according to a gradient selection method, wherein the number of the freeze-thaw test pieces in each group is the same;
s7, carrying out indirect tensile fatigue test on the multiple groups of freeze-thaw test pieces prepared in the step S6 and the unfrozen test pieces prepared in the step S1 through an indirect tensile fatigue test device, taking complete fracture of the test pieces as a fatigue damage judgment standard, and finally obtaining freeze-thaw fatigue life values N and freeze-thaw cycle times x of the multiple groups of test pieces, wherein the load cycle times are fatigue lives of the test pieces when the test is finished;
s8, performing nonlinear regression on the freeze-thaw fatigue life values and the freeze-thaw cycle times of the multiple groups of test pieces by using Origin software, wherein a fatigue equation obtained by regression is as follows:
N＝Axb
wherein, N-the freeze-thaw fatigue life (times);
x-number of freeze-thaw cycles (times);
a, b-fatigue equation parameters.
2. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: in step S1, after the test pieces are cured at room temperature for 24 hours, a hole is drilled in the center of one of the freeze-thaw test pieces, a thermometer is installed in the hole to detect the temperature inside the test piece, and the freeze-thaw test piece is used as a temperature control standard test piece.
3. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: in step S3, the top depth H of the lower layer of the asphalt concrete pavement14cm, bottom depth H2Is 10 cm.
4. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: in step S5, the condition for switching between the freezing temperature and the thawing temperature is one of the following conditions,
1) the detected central temperature of the freeze-thaw test piece reaches the set freezing temperature or melting temperature;
2) the freezing time reaches 8 h;
3) the melting time reaches 4 h.
5. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: the temperature gradient of the freezing temperature and the melting temperature is 5 ℃/h.
6. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: in step S5, a start button of the freeze-thaw testing machine is pressed, the freeze-thaw testing machine automatically performs a freeze-thaw cycling test according to the set parameters until the required number of freeze-thaw times is reached, and if the test is temporarily terminated, the freeze-thaw test piece needs to be ensured to be in a frozen state.
7. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: before the indirect tensile fatigue test is carried out, the splitting tensile strength corresponding to a test piece made of asphalt concrete material needs to be determined, the splitting tensile strength is calculated by adopting the following formula,
RT＝0.006287PT/h
wherein R isT-tensile strength at split (Mpa);
PT-maximum value of test load (N);
h-height of the specimen (mm).
8. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: when the indirect tensile fatigue test is performed in step S7, the load control mode of the indirect tensile fatigue test apparatus is the stress control mode, and the stress value is 0.2RTThe loading waveform is a half sine wave and the loading frequency is 10 Hz.
9. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: weighting the monthly average humidity according to the probability of freeze-thaw cycles occurring per month according to the hourly humidity data obtained in the step S2, calculating the monthly average relative humidity when the freeze-thaw cycles occur per month, summarizing the monthly average humidity every year, calculating the annual average relative humidity every year, summarizing and averaging the annual average relative humidity every 20 years, and finally obtaining the total average relative humidity psiTotal mean of。
10. The test method for the freeze-thaw fatigue performance of the construction waste recycled aggregate asphalt concrete according to claim 1, characterized by comprising the following steps: the concrete freeze-thaw testing machine is characterized in that thermometers are placed in a test tank and a water bath box of the concrete freeze-thaw testing machine, and the number of the thermometers in the test tank is two.
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