CN117902864A - Preparation method of regenerated waste polyurethane concrete and workability detection equipment - Google Patents
Preparation method of regenerated waste polyurethane concrete and workability detection equipment Download PDFInfo
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- CN117902864A CN117902864A CN202410318183.5A CN202410318183A CN117902864A CN 117902864 A CN117902864 A CN 117902864A CN 202410318183 A CN202410318183 A CN 202410318183A CN 117902864 A CN117902864 A CN 117902864A
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 244
- 239000004814 polyurethane Substances 0.000 title claims abstract description 244
- 239000004567 concrete Substances 0.000 title claims abstract description 167
- 239000002699 waste material Substances 0.000 title claims abstract description 132
- 238000001514 detection method Methods 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 180
- 229920000570 polyether Polymers 0.000 claims abstract description 180
- 239000000463 material Substances 0.000 claims abstract description 110
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 50
- 239000003085 diluting agent Substances 0.000 claims abstract description 40
- 238000002156 mixing Methods 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000004568 cement Substances 0.000 claims abstract description 30
- 238000002791 soaking Methods 0.000 claims abstract description 20
- 230000008595 infiltration Effects 0.000 claims abstract description 5
- 238000001764 infiltration Methods 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 94
- 238000012360 testing method Methods 0.000 claims description 39
- 239000010426 asphalt Substances 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 19
- 238000007865 diluting Methods 0.000 claims description 14
- 238000001035 drying Methods 0.000 claims description 11
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 2
- 239000010812 mixed waste Substances 0.000 claims 1
- 230000008929 regeneration Effects 0.000 claims 1
- 238000011069 regeneration method Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 20
- 238000011156 evaluation Methods 0.000 abstract description 20
- 239000004566 building material Substances 0.000 abstract description 2
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical group CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 21
- 230000002194 synthesizing effect Effects 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 15
- 238000011068 loading method Methods 0.000 description 10
- 235000019738 Limestone Nutrition 0.000 description 9
- 239000006028 limestone Substances 0.000 description 9
- 238000007689 inspection Methods 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- 238000010998 test method Methods 0.000 description 6
- 238000005303 weighing Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000005056 compaction Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The invention relates to the field of building materials, in particular to a preparation method of regenerated waste polyurethane concrete and workability detection equipment. The preparation method of the regenerated waste polyurethane concrete provided by the invention comprises the following steps: step 1), soaking natural aggregate in silane coupling agent diluent to obtain pretreated natural aggregate; step 2), adding diluted polyether polyurethane cementing material into waste polyether polyurethane concrete, and carrying out infiltration treatment; and 3) adding the pretreated natural aggregate, the soaked waste polyether polyurethane concrete and cement for mixing, then adding water for mixing, standing, and then adding polyether polyurethane cementing material for mixing to obtain the regenerated polyurethane concrete. The invention also provides construction workability detection and evaluation equipment, so that the waste polyurethane concrete road prepared by the preparation method of the regenerated waste polyurethane concrete has the advantages of good performance, short operation flow and less manual intervention.
Description
Technical Field
The invention relates to the field of building materials, in particular to a preparation method and workability detection equipment of regenerated waste polyurethane concrete capable of solving the problem of recycling waste polyether polyurethane concrete.
Background
At present, the traditional pavement material is mainly asphalt-based material, and because asphalt has the characteristics of easy softening at high temperature, easy brittle fracture at low temperature, easy loosening when meeting water and the like, early diseases such as pits, cracks, pushing, delamination and the like are easy to occur on an asphalt pavement layer, and the service life of a road is seriously influenced. The polyether polyurethane concrete is a novel road paving material which takes polyether polyurethane to completely replace asphalt as cementing material, has the advantages of cold mixing and paving, environmental protection, excellent road performance, good durability and the like, can fully meet the requirements of the existing road paving material on various performances, and has been applied to various physical engineering.
The polyether polyurethane concrete pavement can generate a large amount of waste materials in the service period, and how to recycle the waste materials avoids wasting resources is a difficult problem which needs to be solved by road researchers. Therefore, a preparation method of recycled waste polyether polyurethane concrete is urgently needed to solve the problems in the related art.
Disclosure of Invention
The invention provides a preparation method and workability detection equipment of regenerated waste polyurethane concrete, and aims to solve the technical problem of recycling waste polyether polyurethane concrete.
The technical scheme adopted by the invention is as follows:
the preparation method of the regenerated waste polyurethane concrete comprises the following steps:
Step 1), soaking natural aggregate in silane coupling agent diluent to obtain pretreated natural aggregate;
step 2), adding diluted polyether polyurethane cementing material into waste polyether polyurethane concrete, and carrying out infiltration treatment; the polyether polyurethane cementing material has the standard that the tensile strength at 25 ℃ is not less than 5MPa, the elongation at break at 25 ℃ is not less than 350%, the surface drying time at 25 ℃ is 5.0-8.0 h, and the bonding strength at 25 ℃ is not less than 5 Mpa;
And 3) adding the pretreated natural aggregate, the soaked waste polyurethane concrete and cement for mixing, then adding water for mixing, standing, and then adding polyether polyurethane cementing material for mixing, thereby preparing the regenerated polyurethane concrete.
Preferably, the natural aggregate in the step 1) is synthesized according to the composition grading of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=15 to 22.5 parts: 15-22.5 parts of: 26-39 parts of: 4-6 parts of a mass fraction ratio. The silane coupling agent diluent in the step 1) is prepared according to the following silane coupling agent: deionized water: absolute ethanol=5-7 parts: 40-45 parts of: and diluting 50-53 parts by mass. And (3) placing the natural aggregate in a silane coupling agent diluent for soaking for 3-4 hours, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2-3 hours for drying to obtain the pretreated natural aggregate.
Preferably, the waste polyurethane concrete in the step 2) is synthesized according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm=4-16 parts: 4-16 parts of: and 2-8 parts of a mass fraction ratio. The diluted polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 3-5 parts: and (3) diluting 12-15 parts to obtain the product. Adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material at normal temperature for at least 3h to obtain the soaked waste polyether polyurethane concrete; the usage amount of the diluted polyether polyurethane cementing material is 3% -4% of the mass of the waste polyether polyurethane concrete.
Preferably, in the step 3), the pretreated natural aggregate, the soaked waste polyether polyurethane concrete, cement, water and polyether polyurethane cementing material are respectively 60-90 parts by mass of the pretreated natural aggregate, 10-40 parts by mass of the waste polyether polyurethane concrete, 4-8 parts by mass of the cement, 7-9 parts by mass of the water and 8.2-10.2 parts by mass of the polyether polyurethane cementing material. The concrete mixing step is that firstly, the pretreated natural aggregate, the soaked waste polyether polyurethane concrete and cement are mixed for 90s, then water is added for 60s, and after standing for 60s, polyether polyurethane cementing material is added for 90s, and the regenerated polyurethane concrete is prepared.
On the other hand, the invention provides the workability detection equipment for the construction of the regenerated waste polyurethane concrete, which comprises a cylindrical mixture charging mould and a cake-shaped pressure mould arranged in the cylindrical mixture charging mould, wherein uniformly distributed material flowing holes are formed in the cylindrical mixture charging mould, the material flowing holes penetrate through the wall of the cylindrical mixture charging mould, the material flowing holes are used for flowing out of the mixture placed in the cake-shaped pressure mould under the continuous pressure of the cake-shaped pressure mould, a connecting piece is arranged above the cake-shaped pressure mould, and the upper end of the connecting piece can be connected with a test head of a UTM asphalt mixture multifunctional tester.
Preferably, the height of the cylindrical mixture charging mould is 90mm, the inner diameter of the cylindrical test piece forming mould is 110mm, the thickness of the circular cake-shaped pressure mould is 30mm, the diameter of the circular cake-shaped pressure mould is 110mm, the aperture of the flow hole is 1.5-2 times of the maximum particle diameter of the polyether polyurethane concrete aggregate to be evaluated, the central axis of the flow hole is vertically arranged with the cylinder wall of the cylindrical mixture charging mould, the interval between the adjacent flow holes in the horizontal direction is 20mm, the interval between the adjacent flow holes in the vertical direction is 10mm, a connecting piece connected with a test head of the UTM asphalt mixture multifunctional tester above the circular cake-shaped pressure mould is a connecting rod, and the length of the connecting rod is 300mm and the diameter of the connecting rod is 20mm.
The multifunctional testing machine for the UTM asphalt mixture is provided with an environment insulation box. The UTM-25 asphalt mixture multifunctional testing machine adopted by the instrument is provided with a matched environment insulation box, and the temperature of the environment box can be adjusted through a temperature controller.
Further preferably, the height of the test head and the lifting platform of the UTM asphalt mixture multifunctional tester can be adjusted. The UTM-25 asphalt mixture multifunctional testing machine is provided with matched software UTS, and the heights of a testing head and a lifting platform of the machine can be adjusted through software operation.
Further preferably, the UTM asphalt mixture multifunctional testing machine can adjust loading speed and penetration displacement. The UTM-25 asphalt mixture multifunctional testing machine is provided with matched software UTS, the descending rate (namely the loading rate) of a testing head of the machine can be adjusted through software operation, and the loading pressure can be set.
The workability detection equipment for the construction of the regenerated waste polyurethane concrete comprises the following specific steps:
Step S1: preparing a die, uniformly mixing the recycled polyether polyurethane concrete, standing, waiting for time t, and filling the mixture into a cavity of the die, and weighing the total weight of the die and the recycled polyether polyurethane concrete to obtain the mass m 0;
Step S2: connecting a cake-shaped pressure die with UTM through a connecting rod, placing a cylindrical mixture charging die filled with the regenerated polyether polyurethane concrete under the cylindrical mixture charging die, and loading the cylindrical mixture charging die under 700Kpa of pressure;
Step S3: after loading, scraping the mixture extruded from the flow hole, and weighing the total weight of the cylindrical mixture charging mould and the rest of the regenerated polyether polyurethane concrete to obtain the mass m 1;
Step S3: mixture overflow rate of test piece (%) Can be according to the formulaCalculating and drawing the overflow rate of the mixtureA relation between latency t;
step S4: according to the analysis of the high-temperature stability, the low-temperature crack resistance and the water stability of the regenerated polyether polyurethane concrete at different overflow rates of the mixture, the overflow rate of the mixture is obtained The waiting time t corresponding to the interval of 30% -40% is the optimal waiting time for paving, and the determination of the optimal paving time of the regenerated polyether polyurethane concrete in construction is guided.
The road performance evaluation method is that after a test piece is molded, the test piece is put into a 60 ℃ oven for curing for 7 days, and then road performance evaluation is carried out according to the relevant test in the Specification of Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011).
The invention has the beneficial effects that:
1. The road performance of the polyurethane concrete prepared by the preparation method of the regenerated waste polyurethane concrete is far higher than that of the SBS modified asphalt mixture;
2. compared with the prior art, the invention discloses the independently-developed construction workability detection and evaluation equipment
Drawing the overflow rate of the mixture through evenly and regularly arranged material flowing holes on the dieThe relation curve between the waiting time t and the optimal compacting time of the regenerated waste polyurethane concrete is determined, the problem that the compacting time cannot be quantified is solved, the device is short in operation flow, less in manual intervention, stable and reliable in system, and easy to popularize and apply in actual construction.
Drawings
FIG. 1 is a schematic flow chart of a preparation method of regenerated waste polyurethane concrete;
FIG. 2 is a schematic structural diagram of the workability detection equipment for construction of regenerated waste polyurethane concrete;
FIG. 3 is a graph showing the mixture overflow rate of the test piece of the present invention And the waiting time t.
In the figure: 1. a cylindrical mix charging die; 2. a cake-shaped pressure die; 3. a flow hole; 4. and a connecting piece.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. 100g are selected as a mass fraction for weighing in the following examples.
Example 1
The embodiment provides regenerated waste polyurethane concrete, which is prepared by the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=15 parts, 15 parts, 26 parts, and 4 parts of natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 5 parts: 45 parts: diluting 50 parts by mass fraction to obtain silane coupling agent diluent; placing natural aggregate in silane coupling agent diluent for soaking for 3h, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 16 parts: 16 parts: 8 parts of waste polyether polyurethane concrete is selected according to the mass fraction; the polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 3 parts: diluting 12 parts to obtain diluted polyether polyurethane cementing material; and (3) soaking treatment: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material for 4h at normal temperature to obtain the soaked waste polyether polyurethane concrete; the usage amount of the diluted polyether polyurethane cementing material is 3% of the mass of the waste polyether polyurethane concrete; the diluent selected in this example is ethyl acetate solvent;
and 3) respectively taking 60 parts of pretreated natural aggregate, 40 parts of immersed waste polyurethane concrete, 4 parts of cement, 7 parts of water and 10.2 parts of polyether polyurethane cementing material according to mass fraction, mixing 60 parts of pretreated natural aggregate, 40 parts of immersed waste polyether polyurethane concrete and 4 parts of cement for 90s, then adding 7 parts of water for mixing 60s, standing for 60s, and then adding 10.2 parts of polyether polyurethane cementing material for mixing 90s, thereby preparing the regenerated polyurethane concrete.
The workability detection equipment for the regenerated waste polyurethane concrete construction comprises a cylindrical mixture charging mold 1 with the height of 90mm, wherein the inner diameter of the cylindrical test piece forming mold 1 is 110mm, a cake-shaped pressure mold 2 with the thickness of 30mm is arranged in the cylindrical test piece forming mold 1, the diameter of the cake-shaped pressure mold 2 is 110mm, evenly distributed flow holes 3 are formed in the cylindrical mixture charging mold 1, the flow holes 3 penetrate through the wall of the cylindrical mixture charging mold 1, the central axis of each flow hole 3 is vertically arranged with the wall of the cylindrical mixture charging mold 1, the aperture of each flow hole 3 is 1.5-2 times of the maximum grain diameter of the evaluated polyether polyurethane concrete aggregate, the distance between the adjacent flow holes 3 in the horizontal direction is 20mm, the distance between the adjacent flow holes 3 in the vertical direction is 10mm, each flow hole 3 is used for flowing out of a mixture placed in the cake-shaped pressure mold 2 under continuous pressure, rod length is 300mm above the cake-shaped pressure mold 2, rod-shaped connectors 4 with the diameter of 20mm are arranged, and the upper ends of the connectors 4 are connected with a UTM multifunctional asphalt mixture tester head.
The multifunctional testing machine for the UTM asphalt mixture is provided with an environment insulation box. The UTM-25 asphalt mixture multifunctional testing machine adopted by the instrument is provided with a matched environment insulation box, and the temperature of the environment box can be adjusted through a temperature controller. The height of the test head and the lifting platform of the UTM asphalt mixture multifunctional tester can be adjusted. The UTM-25 asphalt mixture multifunctional testing machine is provided with matched software UTS, and the heights of a testing head and a lifting platform of the machine can be adjusted through software operation. The UTM asphalt mixture multifunctional testing machine can adjust loading speed and penetration displacement. The UTM-25 asphalt mixture multifunctional testing machine is provided with matched software UTS, the descending rate (namely the loading rate) of a testing head of the machine can be adjusted through software operation, and the loading pressure can be set.
The concrete steps of using the recycled waste polyurethane concrete construction workability detection equipment are as follows:
Step S1: preparing a mould, uniformly mixing the prepared regenerated waste polyether polyurethane concrete, standing, waiting for time t, and filling the mixture into a cavity of the mould, and weighing the total weight of the mould and the regenerated polyether polyurethane concrete to obtain the mass m 0;
Step S2: connecting a cake-shaped pressure die with UTM through a connecting rod, placing a cylindrical mixture charging die filled with the regenerated polyether polyurethane concrete under the cylindrical mixture charging die, and loading the cylindrical mixture charging die under 700Kpa of pressure;
Step S3: after loading, scraping the mixture extruded from the flow hole, and weighing the total weight of the cylindrical mixture charging mould and the residual regenerated polyether polyurethane concrete to obtain the mass m 1;
Step S3: mixture overflow rate of test piece (%) Can be according to the formulaCalculating and drawing the overflow rate of the mixtureA relation between latency t;
step S4: according to the analysis of the high-temperature stability, the low-temperature crack resistance and the water stability of the regenerated polyether polyurethane concrete at different overflow rates of the mixture, the overflow rate of the mixture is obtained The waiting time t corresponding to the interval of 30% -40% is the optimal waiting time for paving, and the determination of the optimal paving time of the regenerated polyether polyurethane concrete in construction is guided.
The road performance evaluation method is that after a test piece is molded, the test piece is put into a 60 ℃ oven for curing for 7 days, and then road performance evaluation is carried out according to the relevant test in the Specification of Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011).
In the embodiment, 1000g of the prepared regenerated waste polyurethane concrete is put into construction workability detection and evaluation equipment of the regenerated waste polyurethane concrete, the pressure is applied to 700Kpa, and the mixture overflow rate is selected to be 35% as the optimal compaction time; and (3) after the waste polyurethane concrete is molded, the waste polyurethane concrete is put into a 60 ℃ oven for curing for 7d, and then is taken out, and road performance evaluation is carried out according to a related test in the Specification of Highway engineering asphalt and asphalt mixture test procedure (JTG E20-2011). The specific performance evaluation results are shown in Table 1.
Example 2
The embodiment provides regenerated waste polyurethane concrete, which is prepared by the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=22.5 parts by mass, 22.5 parts by mass, 39 parts by mass, and 6 parts by mass, selecting natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 7 parts: 40 parts of: diluting 53 parts by mass fraction to obtain silane coupling agent diluent; placing the natural aggregate in a silane coupling agent diluent for soaking for 4 hours, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 3h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 4 parts: 4 parts of: 2 parts of waste polyether polyurethane concrete is selected according to the mass fraction; the polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 5 parts: 15 parts of diluted polyether polyurethane cementing material is obtained; and (3) soaking treatment: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material for 5h at normal temperature to obtain the soaked waste polyether polyurethane concrete; the usage amount of the diluted polyether polyurethane cementing material is 4% of the mass of the waste polyether polyurethane concrete; the diluent selected in this example is ethyl acetate solvent;
And 3) respectively taking 90 parts of pretreated natural aggregate, 10 parts of immersed waste polyether polyurethane concrete, 8 parts of cement, 9 parts of water and 8.2 parts of polyether polyurethane cementing material according to mass fraction, mixing 90 parts of pretreated natural aggregate, 10 parts of immersed waste polyether polyurethane concrete and 8 parts of cement for 90s, adding 9 parts of water for mixing 60s, standing for 60s, and adding 8.2 parts of polyether polyurethane cementing material for mixing 90s, thereby preparing the regenerated polyurethane concrete.
The construction workability detection equipment and the inspection method for the recycled waste polyurethane concrete prepared in this example are the same as those in example 1, and the detection evaluation results are shown in table 1 and are not repeated here.
Example 3
The embodiment provides regenerated waste polyurethane concrete, which is prepared by the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=20 parts, 20 parts, 35 parts, 5 parts of natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 6 parts: 42 parts: diluting 52 parts by mass fraction to obtain silane coupling agent diluent; placing natural aggregate in silane coupling agent diluent for soaking for 3.5 h, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2.5 h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 8 parts: 8 parts of: 4 parts of waste polyether polyurethane concrete is selected according to the mass fraction; the polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 4 parts: 13 parts of diluted polyether polyurethane cementing material is obtained; and (3) soaking treatment: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material for 3h at normal temperature to obtain the soaked waste polyether polyurethane concrete; the dosage of the diluted polyether polyurethane cementing material is 3.5 percent of the mass of the waste polyether polyurethane concrete; the diluent selected in this example is ethyl acetate solvent;
And 3) respectively taking 80 parts of pretreated natural aggregate, 20 parts of immersed waste polyether polyurethane concrete, 6 parts of cement, 8 parts of water and 9.1 parts of polyether polyurethane cementing material according to mass fraction, mixing 80 parts of pretreated natural aggregate, 20 parts of immersed waste polyether polyurethane concrete and 6 parts of cement for 90s, then adding 8 parts of water for mixing 60s, standing for 60s, and then adding 9.1 parts of polyether polyurethane cementing material for mixing 90s, thereby preparing the regenerated polyurethane concrete.
The construction workability detection equipment and the inspection method for the recycled waste polyurethane concrete prepared in this example are the same as those in example 1, and the detection evaluation results are shown in table 1 and are not repeated here.
Example 4
The embodiment provides regenerated waste polyurethane concrete, which is prepared by the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=15 parts, 15 parts, 26 parts, and 4 parts of natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 6.5 parts: 42 parts: diluting 50 parts by mass fraction to obtain silane coupling agent diluent; placing natural aggregate in silane coupling agent diluent for soaking for 3 h, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 16 parts: 16 parts: 8 parts of waste polyether polyurethane concrete is selected according to the mass fraction; the polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 3 parts: diluting 12 parts to obtain diluted polyether polyurethane cementing material; and (3) soaking treatment: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material for 4h at normal temperature to obtain the soaked waste polyether polyurethane concrete; the usage amount of the diluted polyether polyurethane cementing material is 3% of the mass of the waste polyether polyurethane concrete; the diluent selected in this example is ethyl acetate solvent;
And 3) respectively taking 60 parts of pretreated natural aggregate, 40 parts of immersed waste polyether polyurethane concrete, 4 parts of cement, 7 parts of water and 10.2 parts of polyether polyurethane cementing material according to mass fraction, mixing 60 parts of pretreated natural aggregate, 40 parts of immersed waste polyether polyurethane concrete and 4 parts of cement for 90s, then adding 7 parts of water for mixing 60s, standing for 60s, and then adding 10.2 parts of polyether polyurethane cementing material for mixing 90s, thereby preparing the regenerated polyurethane concrete.
The construction workability detection equipment and the inspection method for the recycled waste polyurethane concrete prepared in this example are the same as those in example 1, and the detection evaluation results are shown in table 1 and are not repeated here.
Example 5
The embodiment provides regenerated waste polyurethane concrete, which is prepared by the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=15 parts, 15 parts, 26 parts, and 4 parts of natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 5 parts: 45 parts: diluting 50 parts by mass fraction to obtain silane coupling agent diluent; placing natural aggregate in silane coupling agent diluent for soaking for 3h, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 16 parts: 16 parts: 8 parts of waste polyether polyurethane concrete is selected according to the mass fraction; the polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 5 parts: 10 parts of diluted polyether polyurethane cementing material is obtained; and (3) soaking treatment: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material for 5h at normal temperature to obtain the soaked waste polyether polyurethane concrete; the usage amount of the diluted polyether polyurethane cementing material is 4% of the mass of the waste polyether polyurethane concrete; the diluent selected in this example is ethyl acetate solvent;
And 3) respectively taking 60 parts of pretreated natural aggregate, 40 parts of immersed waste polyether polyurethane concrete, 4 parts of cement, 7 parts of water and 10.2 parts of polyether polyurethane cementing material according to mass fraction, mixing 60 parts of pretreated natural aggregate, 40 parts of immersed waste polyether polyurethane concrete and 4 parts of cement for 90s, then adding 7 parts of water for mixing 60s, standing for 60s, and then adding 10.2 parts of polyether polyurethane cementing material for mixing 90s, thereby preparing the regenerated polyurethane concrete.
The construction workability detection equipment and the inspection method for the recycled waste polyurethane concrete prepared in this example are the same as those in example 1, and the detection evaluation results are shown in table 1 and are not repeated here.
Comparative example 1
This comparative example differs from example 3 in that the natural aggregate was not pretreated with a silane coupling agent diluent.
The preparation method comprises the following steps:
step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=20 parts, 20 parts, 35 parts, 5 parts of natural aggregate; the natural aggregate used in this example is limestone;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 8 parts: 8 parts of: 4 parts of waste polyether polyurethane concrete is selected according to the mass fraction; the polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 4 parts: 13 parts of diluted polyether polyurethane cementing material is obtained; and (3) soaking treatment: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material for 3h at normal temperature to obtain the soaked waste polyether polyurethane concrete; the dosage of the diluted polyether polyurethane cementing material is 3.5 percent of the mass of the waste polyether polyurethane concrete; the diluent selected in this example is ethyl acetate solvent;
And 3) respectively taking 80 parts of natural aggregate which is not pretreated, 20 parts of waste polyether polyurethane concrete which is subjected to infiltration treatment, 6 parts of cement, 8 parts of water and 9.1 parts of polyether polyurethane cementing material according to mass fraction, mixing 80 parts of natural aggregate which is not pretreated, 20 parts of waste polyether polyurethane concrete which is subjected to infiltration treatment and 6 parts of cement for 90s, then adding 8 parts of water for mixing for 60s, standing for 60s, and adding 9.1 parts of polyether polyurethane cementing material for mixing for 90s, thereby preparing the regenerated polyurethane concrete.
The construction workability detection equipment and the inspection method for the recycled waste polyurethane concrete prepared in this comparative example are the same as those in example 1, and the detection evaluation results are shown in table 1 and are not repeated here.
Comparative example 2
This comparative example differs from example 3 in that no wet treatment was performed on the waste polyurethane concrete.
The preparation method comprises the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=20 parts, 20 parts, 35 parts, 5 parts of natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 6 parts: 42 parts: diluting 52 parts by mass fraction to obtain silane coupling agent diluent; placing natural aggregate in silane coupling agent diluent for soaking for 3.5 h, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2.5 h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 8 parts: 8 parts of: 4 parts of waste polyether polyurethane concrete is selected according to the mass fraction;
And 3) respectively taking 80 parts of pretreated natural aggregate, 20 parts of non-infiltrated waste polyether polyurethane concrete, 6 parts of cement, 8 parts of water and 9.1 parts of polyether polyurethane cementing material according to mass fraction, mixing 80 parts of pretreated natural aggregate, 20 parts of non-infiltrated waste polyether polyurethane concrete and 6 parts of cement for 90s, then adding 8 parts of water for mixing 60s, standing for 60s, and then adding 9.1 parts of polyether polyurethane cementing material for mixing 90s, thereby preparing the regenerated polyurethane concrete.
The construction workability detection equipment and the inspection method for the recycled waste polyurethane concrete prepared in this comparative example are the same as those in example 1, and the detection evaluation results are shown in table 1 and are not repeated here.
Comparative example 3
This comparative example differs from example 3 in that no waste polyurethane concrete was added.
The preparation method comprises the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=20 parts, 20 parts, 35 parts, 5 parts of natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 6 parts: 42 parts: diluting 52 parts by mass fraction to obtain silane coupling agent diluent; placing natural aggregate in silane coupling agent diluent for soaking for 3.5 h, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2.5 h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
And 2) respectively taking 80 parts of pretreated natural aggregate, 6 parts of cement, 8 parts of water and 9.1 parts of polyether polyurethane cementing material according to mass fraction, mixing 80 parts of pretreated natural aggregate and 6 parts of cement for 90s, then adding 8 parts of water for 60s, standing for 60s, and then adding 9.1 parts of polyether polyurethane cementing material for 90s, thereby preparing the concrete.
The workability test equipment and test method for the concrete prepared in this comparative example were the same as in example 1, and the test evaluation results are shown in table 1 and are not repeated here.
Comparative example 4
This comparative example differs from example 3 in that no construction workability detection evaluation equipment was used to determine the optimal compaction timing.
The regenerated waste polyurethane concrete prepared in this comparative example was not used to determine the optimal compaction time by using the construction workability detection and evaluation equipment, the preparation method and the material ratio are the same as those in example 3, and the detection and evaluation results are shown in table 1 and are not repeated here.
Comparative example 5
This comparative example differs from example 3 in that polyether polyurethane was not used as the cement and the same parts of modified emulsified asphalt was used as the cement.
The preparation method comprises the following steps:
Step 1), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=20 parts, 20 parts, 35 parts, 5 parts of natural aggregate; according to the silane coupling agent: deionized water: absolute ethanol = 6 parts: 42 parts: diluting 52 parts by mass fraction to obtain silane coupling agent diluent; placing natural aggregate in silane coupling agent diluent for soaking for 3.5 h, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2.5 h drying to obtain pretreated natural aggregate; the natural aggregate used in this example is limestone; the silane coupling agent can be KH550, KH560, KH570, etc., and KH550 type silane coupling agent is adopted in the embodiment;
Step 2), synthesizing the material according to the composition gradation of 10-15 mm: 5-10 mm: 0-5 mm = 8 parts: 8 parts of: 4 parts of waste polyether polyurethane concrete is selected according to the mass fraction; the polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 4 parts: 13 parts of diluted polyether polyurethane cementing material is obtained; and (3) soaking treatment: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete, mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete and the diluted polyether polyurethane cementing material, and standing the mixed and diluted waste polyether polyurethane concrete of the polyether polyurethane cementing material for 3h at normal temperature to obtain the soaked waste polyether polyurethane concrete; the dosage of the diluted polyether polyurethane cementing material is 3.5 percent of the mass of the waste polyether polyurethane concrete; the diluent selected in this example is ethyl acetate solvent;
And 3) respectively taking 80 parts of pretreated natural aggregate, 20 parts of soaked waste polyether polyurethane concrete, 6 parts of cement, 8 parts of water and 9.1 parts of SBS modified asphalt cement according to mass fraction, mixing 80 parts of pretreated natural aggregate, 20 parts of soaked waste polyether polyurethane concrete and 6 parts of cement for 90s, then adding 8 parts of water for mixing 60s, standing for 60s, and then adding 9.1 parts of SBS modified asphalt cement for mixing 90s, thereby preparing the regenerated polyurethane concrete.
The construction workability detection equipment and the inspection method for the recycled waste polyurethane concrete prepared in this comparative example are the same as those in example 1, and the detection evaluation results are shown in table 1 and are not repeated here.
The regenerated waste polyurethane concrete disclosed by the invention is molded, cured and tested according to the test method in the test procedure of asphalt and asphalt mixture for highway engineering (JTGE-2011), and the test results are shown in the following table 1:
TABLE 1
Claims (9)
1. The preparation method of the regenerated waste polyurethane concrete is characterized by comprising the following steps of:
Step 1), soaking natural aggregate in silane coupling agent diluent to obtain pretreated natural aggregate;
step 2), adding diluted polyether polyurethane cementing material into waste polyether polyurethane concrete, and carrying out infiltration treatment;
And 3) adding the pretreated natural aggregate, the soaked waste polyurethane concrete and cement for mixing, then adding water for mixing, standing, and then adding polyether polyurethane cementing material for mixing, thereby preparing the regenerated polyurethane concrete.
2. The method for preparing regenerated waste polyurethane concrete according to claim 1, wherein the method comprises the following steps: the natural aggregate in the step 1) has a synthetic gradation of 10-15 mm: 5-10 mm: 0-5 mm: mineral powder=15 to 22.5 parts: 15-22.5 parts of: 26-39 parts of: 4-6 parts of a mass fraction ratio; the silane coupling agent diluent in the step 1) is prepared according to the following silane coupling agent: deionized water: absolute ethanol=5-7 parts: 40-45 parts of: and diluting 50-53 parts by mass.
3. The method for preparing regenerated waste polyurethane concrete according to claim 1, wherein the method comprises the following steps: and 1) placing the natural aggregate in a silane coupling agent diluent for soaking for 3-4 hours, taking out the soaked natural aggregate, and then placing the natural aggregate in a 60 ℃ oven for 2-3 hours for drying to obtain the pretreated natural aggregate.
4. The method for preparing regenerated waste polyurethane concrete according to claim 1, wherein the method comprises the following steps: the synthetic gradation of the waste polyether polyurethane concrete in the step 2) is 10-15 mm: 5-10 mm: 0-5 mm=4-16 parts: 4-16 parts of: 2-8 parts of a mass fraction ratio; the diluted polyether polyurethane cementing material comprises the following components in percentage by mass: diluent = 3-5 parts: and (3) diluting 12-15 parts to obtain the product.
5. The method for preparing regenerated waste polyurethane concrete according to claim 1, wherein the method comprises the following steps: adding the diluted polyether polyurethane cementing material into the waste polyether polyurethane concrete in the step 2), mechanically stirring for 10min to uniformly mix the waste polyether polyurethane concrete with the diluted polyether polyurethane cementing material, and standing the mixed waste polyether polyurethane concrete of the diluted polyether polyurethane cementing material at normal temperature for at least 3h to obtain the soaked waste polyether polyurethane concrete; the usage amount of the diluted polyether polyurethane cementing material is 3% -4% of the mass of the waste polyether polyurethane concrete.
6. The method for preparing regenerated waste polyurethane concrete according to claim 1, wherein the method comprises the following steps: in the step 3), 60-90 parts of the pretreated natural aggregate, 10-40 parts of the waste polyether polyurethane concrete, 4-8 parts of cement, 7-9 parts of water and 8.2-10.2 parts of polyether polyurethane cementing material are used according to mass fractions.
7. The method for preparing regenerated waste polyurethane concrete according to claim 1, wherein the method comprises the following steps: in the step 3), the concrete mixing step is that firstly, the pretreated natural aggregate, the soaked waste polyether polyurethane concrete and cement are mixed for 90s, then water is added for 60s, and after standing for 60s, polyether polyurethane cementing material is added for 90s, and the regenerated polyurethane concrete is prepared.
8. The utility model provides a regeneration old and useless polyurethane concrete workability detection equipment which characterized in that: the multifunctional testing machine comprises a cylindrical mixture charging mould and a cake-shaped pressure mould arranged in the cylindrical mixture charging mould, wherein evenly-distributed material flowing holes are formed in the cylindrical mixture charging mould, the material flowing holes penetrate through the wall of the cylindrical mixture charging mould, the material flowing holes are used for flowing out of a mixture placed in the cylindrical mixture charging mould under the continuous pressure of the cake-shaped pressure mould, a connecting piece is arranged above the cake-shaped pressure mould, and the upper end of the connecting piece can be connected with a testing head of the UTM asphalt mixture multifunctional testing machine.
9. The recycled waste polyurethane concrete workability detection apparatus as claimed in claim 8, wherein: the height of the cylindrical mixture charging mould is 90mm, the inner diameter of the cylindrical test piece forming mould is 110mm, the thickness of the cake-shaped pressure mould is 30mm, the diameter of the cake-shaped pressure mould is 110mm, the aperture of the flow hole is 1.5-2 times of the maximum particle diameter of the evaluated polyether polyurethane concrete aggregate, the central axis of the flow hole is vertically arranged with the wall of the cylindrical mixture charging mould, the distance between the adjacent flow holes in the horizontal direction is 20mm, the distance between the adjacent flow holes in the vertical direction is 10mm, the connecting piece connected with the test head of the UTM asphalt mixture multifunctional tester above the cake-shaped pressure mould is a connecting rod, the length of the connecting rod is 300mm, and the diameter of the connecting rod is 20mm.
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