CN115140970B - Vibration-pressure-free self-curing cement stabilized macadam mixture and preparation method thereof - Google Patents
Vibration-pressure-free self-curing cement stabilized macadam mixture and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The application relates to a vibration-free self-curing cement stabilized macadam mixture and a preparation method thereof, wherein the vibration-free self-curing cement stabilized macadam mixture comprises the following components in parts by mass: 24-36 parts of cement; 330-370 parts of graded broken stone; 50-70 parts of river sand; 37-41 parts of stone scraps; 24-32 parts of water; 16-26 parts of polylactic acid blending system; 45-65 parts of steel slag; 20-35 parts of composite gneiss; 2-4 parts of water reducer. The polylactic acid blending system and the composite gneiss are added in the system, the polylactic acid blending body is made of high polymer materials, the mechanical property of the system is improved, the rigidity and the toughness of the modified gneiss can be replaced by the system, and the mechanical strength of the cement stabilized macadam system can be synergistically improved by combining the polylactic acid blending body with the composite gneiss.
Description
Technical Field
The application relates to the field of road construction, in particular to a vibration-free self-curing cement stabilized macadam mixture and a preparation method thereof.
Background
The cement stabilized macadam takes graded macadam as aggregate, adopts a certain amount of gel materials and enough mortar volume to fill gaps of the aggregate, and is paved and compacted according to the embedding and extrusion principle, thus being an ideal base material of the advanced pavement.
However, the cement stabilized macadam is also sensitive to temperature changes, and is sensitive to temperature and humidity changes due to the addition of certain rigid materials, and cracks can be generated due to temperature changes during season transition.
Based on the above problems, the inventor considers that it is necessary to develop a vibration-free self-curing cement stabilized macadam mixture.
Disclosure of Invention
In order to improve the strength of the cement stabilized macadam, the application provides a vibration-free self-curing cement stabilized macadam mixture and a preparation method thereof.
In a first aspect, the application provides a vibration-free self-curing cement stabilized macadam mixture, which adopts the following technical scheme:
the vibration-free self-curing cement stabilized macadam mixture comprises the following components in parts by mass:
24-36 parts of cement
330-370 parts of graded broken stone
50-70 parts of river sand
37-41 parts of stone dust
24-32 parts of water
16-26 parts of polylactic acid blending system
45-65 parts of steel slag
20-35 parts of composite gneiss
2-4 parts of water reducer.
After the polylactic acid blending system is added into the system, the overall thermal stability of the system can be improved, and meanwhile, the toughness and rigidity of the cement stabilized macadam are also improved, so that the overall performance of the cement stabilized macadam is improved; the gneiss is modified to obtain the composite gneiss, so that the gneiss has good impact resistance, and the composite gneiss is added into a cement stabilized macadam system, so that the system has good impact resistance.
Preferably, the preparation method of the composite gneiss comprises the following steps:
drying gneiss, adding the gneiss into an ethanol solution containing stearic acid after the gneiss is completely dried, heating, stirring at constant temperature, standing to room temperature, adding an ethanol solution containing a silane coupling agent, heating and stirring, carrying out ultrasonic treatment on the stirred suspension solution, steaming to evaporate absolute ethanol, and drying a sample to obtain dried modified gneiss; mixing the modified gneiss with polypropylene powder, injection molding and crushing to obtain the composite gneiss.
Silanol generated after the hydrolysis of the silane coupling agent reacts with hydroxyl groups of the gneiss, and a coupling agent molecular film is formed on the surface of the gneiss, so that the surface of the gneiss is organized, and meanwhile, stearic acid is coated on the surface of the gneiss, thereby helping the gneiss to be better organized; the organized gneiss and the polypropylene are compounded to finally obtain the compound gneiss, and the dispersion performance of the organized gneiss in the polypropylene is excellent, so that the strength and the toughness of the system are improved, and the strength and the toughness of the cement stabilized macadam mixture are further improved.
Preferably, the mass ratio between the gneiss and the polypropylene is 1 (9.5-10.5).
The quality ratio of gneiss to polypropylene is controlled within the range, so that the performance of the modified gneiss can be improved.
Preferably, the silane coupling agent is KH570.
Preferably, the polylactic acid blending system comprises: compatibilizer, polybutylene terephthalate, polylactic acid and wollastonite.
Polylactic acid is used as a natural polymer material and has excellent mechanical properties; the polybutylene terephthalate is thermoplastic biodegradable aromatic-aliphatic copolyester, has toughness and thermal stability of an aromatic chain segment, has rigidity and degradability of aliphatic, has good thermal stability, and is an environment-friendly material; wollastonite is a mineral with a fibrous needle-like structure, has excellent thermal stability, can improve the mechanical property of a high polymer material after being combined with the high polymer material, and can improve the strength of a composite material by filling polylactic acid and polybutylene terephthalate with wollastonite; after the compatibilizer is added, the compatibility between the polylactic acid and the polybutylene terephthalate can be improved, so that the toughening effect is further achieved.
Preferably, the mass ratio of wollastonite to polybutylene terephthalate to polylactic acid is 1 (3.7-3.9) to 6.2-6.4.
The mass ratio of wollastonite to polybutylene terephthalate to polylactic acid is controlled within the range, so that the overall performance of the polylactic acid blending system can be improved.
Preferably, the polylactic acid blending system is prepared by the following method:
pre-drying wollastonite fine powder, polylactic acid and polybutylene terephthalate, mixing the polylactic acid, the polybutylene terephthalate and a compatibilizer, extruding and granulating, drying the extruded granules, injecting and crushing to obtain the polylactic acid blending system.
Preferably, the compatibilizer is ADR4380.
Preferably, the graded crushed stone includes:
primary broken stone, secondary broken stone, tertiary broken stone and quaternary broken stone,
the particle size of the primary broken stone is 10-20mm, the particle size of the secondary broken stone is 20-50mm, the particle size of the tertiary broken stone is 50-150mm, and the particle size of the quaternary broken stone is 150-300mm.
The particle size of the crushed stone is further graded and limited, so that the crushed stone and other raw materials are fused more tightly, the gap of the cement stabilized crushed stone after drying is reduced, and the cracking resistance of the cement stabilized crushed stone is improved.
In a second aspect, the application provides a preparation method of a vibration-free self-curing cement stabilized macadam mixture, which adopts the following technical scheme:
a preparation method of a vibration-free self-curing cement stabilized macadam mixture comprises the following steps:
s1, uniformly stirring graded broken stone, adding cement, river sand, stone scraps and steel slag, and stirring again;
s2, adding the composite gneiss, the polylactic acid blending system, the water reducer and water into the mixture obtained in the step S1, and uniformly stirring to obtain a cement stabilized macadam primary material;
and S3, maintaining the relative humidity of the cement stabilized macadam initial mixture obtained in the step S2 at more than 95% at the temperature of 20-22 ℃ for curing, and obtaining the cement stabilized macadam mixture after curing.
In summary, the present application includes at least one of the following beneficial technical effects:
1. after the polylactic acid blending system is added into the cement stabilized macadam mixture, the overall thermal stability, rigidity and toughness of the system can be improved, and after the composite gneiss is added into the cement stabilized macadam, the impact resistance and rigidity of the cement stabilized macadam system can be improved, so that the overall mechanical strength of the system is improved, and the subsequent cracking phenomenon of the cement stabilized macadam is reduced;
the silanol generated after KH570 hydrolysis can react with hydroxyl groups on the surface of gneiss, so that a coupling agent molecular film is formed on the surface of gneiss, the stearic acid is coated on the surface of gneiss, the surface of gneiss can be further organized, the organized gneiss is dispersed in polypropylene, composite gneiss is obtained, and the strength and rigidity of the whole cement stabilized macadam can be improved after the composite gneiss is added into the cement stabilized macadam;
3. wollastonite is mixed with polylactic acid and polybutylene terephthalate, and long chains of the polylactic acid and the polybutylene terephthalate are entangled, and the wollastonite is filled, so that the integral bonding strength of a polylactic acid blending system can be effectively improved, the mechanical properties of the polylactic acid blending system are improved, and the strength and the mechanical properties of the cement stabilized macadam mixture are improved.
Detailed Description
The embodiment of the application discloses a vibration-free self-curing cement stabilized macadam mixture and a preparation method thereof, and the application is further described in detail below by combining the embodiment.
Example 1
Preparing composite gneiss:
drying 1.9g of gneiss at 120 ℃ for 2.5 hours, adding 20ml of ethanol solution containing 0.5% of stearic acid after the gneiss is completely dried, heating to 85 ℃, stirring at a constant temperature of 1200r/min for 1.5 hours, standing to room temperature, adding 20ml of ethanol solution containing 1.5% of silane coupling agent, heating to 80 ℃, stirring at a speed of 500r/min for 20 minutes, carrying out ultrasonic treatment on the stirred suspension solution for 30 minutes, steaming to evaporate absolute ethyl alcohol, and placing a sample in an oven at 70 ℃ for drying for 10 hours to obtain dried modified gneiss; mixing the modified gneiss with 18.1g of polypropylene powder, performing injection molding by using an injection molding machine, and crushing to obtain composite gneiss; wherein the silane coupling agent is KH570.
Preparing a polylactic acid blending system:
pre-drying 3.6g of wollastonite fine powder, 22.3g of polylactic acid and 14.1g of polybutylene terephthalate in a drying box at 70 ℃ for 12 hours, then mixing the polylactic acid, the polybutylene terephthalate and 96mg of compatibilizer, extruding and granulating by a double-screw extruder, drying the extruded granules at 70 ℃ for 1 hour, and carrying out injection molding and crushing in an injection molding machine to obtain a polylactic acid blending system; wherein the compatibilizer is ADR4380.
Preparing a cement stabilized macadam mixture:
s1, adding 330g of graded broken stone into a stirrer, uniformly stirring, adding 24g of cement, 50g of river sand, 37g of stone dust and 45g of steel slag, and stirring again;
s2, adding 20g of composite gneiss, 16g of polylactic acid blending system, 2g of water reducer and 24g of water into the mixture obtained in the step S1, and uniformly stirring by using a stirrer to obtain a cement stabilized macadam primary material;
s3, maintaining the relative humidity of the cement stabilized macadam primary material obtained in the step S2 at more than 95% at 20 ℃ for 24 hours, and obtaining a cement stabilized macadam mixture;
wherein, the graded broken stone comprises 170g of primary broken stone, 90g of secondary broken stone, 40g of tertiary broken stone and 30g of quaternary broken stone; the water reducer is a polycarboxylate water reducer.
Example 2
Preparing composite gneiss:
drying 3g of gneiss at 120 ℃ for 2.5 hours, adding 30ml of ethanol solution containing 0.5% of stearic acid after the gneiss is completely dried, heating to 85 ℃, stirring at a constant temperature of 1200r/min for 1.5 hours, standing to room temperature, adding 30ml of ethanol solution containing 1.5% of silane coupling agent, heating to 80 ℃, stirring at a speed of 500r/min for 20 minutes, carrying out ultrasonic treatment on the stirred suspension solution for 30 minutes, steaming to evaporate absolute ethyl alcohol, and placing a sample in an oven at 70 ℃ for drying for 10 hours to obtain dried modified gneiss; mixing the modified gneiss with 18.1g of polypropylene powder, performing injection molding by using an injection molding machine, and crushing to obtain composite gneiss; wherein the silane coupling agent is KH570.
Preparing a polylactic acid blending system:
pre-drying 5.4g of wollastonite fine powder, 34.6g of polylactic acid and 20g of polybutylene terephthalate in a drying box at 70 ℃ for 12 hours, then mixing the polylactic acid, the polybutylene terephthalate and 132mg of compatibilizer, extruding and granulating by a double-screw extruder, drying the extruded granules at 70 ℃ for 1 hour, and carrying out injection molding and crushing in an injection molding machine to obtain a polylactic acid blending system; wherein the compatibilizer is ADR4380.
Preparing a cement stabilized macadam mixture:
s1, adding 370g of graded broken stone into a stirrer, uniformly stirring, adding 36g of cement, 70g of river sand, 37g of stone chips and 65g of steel slag, and stirring again;
s2, adding 35g of composite gneiss, 26g of polylactic acid blending system, 4g of water reducer and 32g of water into the mixture obtained in the step S1, and uniformly stirring by using a stirrer to obtain a cement stabilized macadam primary material;
s3, maintaining the relative humidity of the cement stabilized macadam primary material obtained in the step S2 at more than 95% at the temperature of 22 ℃ and curing for 24 hours to obtain a cement stabilized macadam mixture;
wherein, the graded broken stone comprises 190g of primary broken stone, 100g of secondary broken stone, 50g of tertiary broken stone and 30g of quaternary broken stone; the water reducer is a polycarboxylate water reducer.
Example 3
Preparing composite gneiss:
2.8g of gneiss is dried for 2.5 hours at the temperature of 120 ℃, after gneiss is completely dried, 25ml of ethanol solution containing 0.5 percent of stearic acid is added, the mixture is heated to 85 ℃, stirred for 1.5 hours at a constant temperature of 1200r/min, after standing to room temperature, 25ml of ethanol solution containing 1.5 percent of silane coupling agent is added, the mixture is heated to 80 ℃, stirred for 20 minutes at the speed of 500r/min, the stirred suspension solution is subjected to ultrasonic treatment for 30 minutes, the dried absolute ethanol is evaporated by rotary evaporation, and a sample is placed in an oven at 70 ℃ to be dried for 10 hours, so that dried modified gneiss is obtained; mixing the modified gneiss with 25.2g of polypropylene powder, performing injection molding by using an injection molding machine, and crushing to obtain composite gneiss; wherein the silane coupling agent is KH570.
Preparing a polylactic acid blending system:
pre-drying 4.5g of wollastonite fine powder, 28.4g of polylactic acid and 17.1g of polybutylene terephthalate in a drying box at 70 ℃ for 12 hours, then mixing the polylactic acid, the polybutylene terephthalate and 108mg of compatibilizer, extruding and granulating by a double-screw extruder, drying the extruded granules at 70 ℃ for 1 hour, and carrying out injection molding and crushing in an injection molding machine to obtain a polylactic acid blending system; wherein the compatibilizer is ADR4380.
Preparing a cement stabilized macadam mixture:
s1, adding 350g of graded broken stone into a stirrer, uniformly stirring, adding 30g of cement, 60g of river sand, 39g of stone chips and 55g of steel slag, and stirring again;
s2, adding 28g of composite gneiss, 20g of polylactic acid blending system, 3g of water reducer and 28g of water into the mixture obtained in the step S1, and uniformly stirring by using a stirrer to obtain a cement stabilized macadam primary material;
s3, maintaining the relative humidity of the cement stabilized macadam primary material obtained in the step S2 at more than 95% at the temperature of 22 ℃ and curing for 24 hours to obtain a cement stabilized macadam mixture;
wherein, in the graded broken stone, 180g of primary broken stone, 85g of secondary broken stone, 55g of tertiary broken stone and 30g of quaternary broken stone are mixed; the water reducer is a polycarboxylate water reducer.
Example 4
Example 4 is based on example 3, the only difference between example 4 and example 3 being that: example 4 in preparing a composite gneiss, the amount of gneiss weighed was 3.5g and the amount of polypropylene weighed was 24.5g.
Example 5
Example 5 is based on example 3, the only difference between example 5 and example 3 being that: example 5 in the preparation of composite gneiss, the amount of gneiss weighed was 2g and the amount of polypropylene weighed was 26g.
Example 6
Example 6 is based on example 3 bits, the only difference between example 6 and example 3 is: example 6 in the preparation of the polylactic acid blend system, 4.9g of wollastonite fine powder was weighed, 26.5g of polylactic acid was weighed, and 18.6g of polybutylene terephthalate was weighed.
Example 7
Example 7 is based on example 3 bits, the only difference between example 7 and example 3 is: example 7 in the preparation of the polylactic acid blend system, 4.2g of wollastonite fine powder was weighed, 30g of polylactic acid was weighed, and 15.8g of polybutylene terephthalate was weighed.
Example 8
Example 8 is based on example 3 bits, and the only difference between example 8 and example 3 is: example 8 in the preparation of the polylactic acid blend system, 4.9g of wollastonite fine powder was weighed, 30.1g of polylactic acid was weighed, and 15g of polybutylene terephthalate was weighed.
Example 9
Example 6 is based on example 3 bits, the only difference between example 6 and example 3 is: example 6 in the preparation of the polylactic acid blend system, 4.2g of wollastonite fine powder was weighed, 26.3g of polylactic acid was weighed, and 19.5g of polybutylene terephthalate was weighed.
Comparative example 1
Comparative example 1 is based on example 3, the only difference between comparative example 1 and example 1 is that: comparative example 1 in the preparation of the polylactic acid blend system, 0g of wollastonite fine powder was weighed, 31.2g of polylactic acid was weighed, and 18.8g of polybutylene terephthalate was weighed.
Comparative example 2
Comparative example 2 is based on example 3, the only difference between comparative example 2 and example 2 is that: comparative example 2 in the preparation of the polylactic acid blend system, the amount of the wollastonite fine powder weighed was 6.8g, the polylactic acid weighed was 43.2g, and the amount of the butylene terephthalate weighed was 0g.
Comparative example 3
Comparative example 3 is based on example 3, and the only difference between comparative example 3 and example 3 is that: in comparative example 3, no compatibilizer was added.
Comparative example 4
Comparative example 4 based on example 3, the only difference between comparative example 4 and example 3 is: in comparative example 4, a silane coupling agent was not added.
Performance test
The cement stabilized macadam of examples 1-9, comparative examples 1-6 were sampled and subjected to the following performance tests:
(1) Selecting a 'highway pavement basic layer construction technical detail JTGT F20-2015' as a standard, preparing each sample into a test piece with the length of 100mm multiplied by 50mm, preparing three test pieces for each sample, curing for 7 days, testing mechanical properties, taking an average value of the detection results after each test piece is detected, and filling in a table 1;
(2) Placing the bottom plate on a flat ground after wetting the slump cone and the bottom plate by taking 25L of cement stabilized macadam mixture, filling the sampled cement stabilized macadam into the cone in three layers, vibrating by using an iron rod, and keeping the height of each layer of sample to be one third of the height of the cone; after vibrating, trowelling the cement stabilized macadam at the mouth of the slump cone, cleaning the cement stabilized macadam on the bottom plate of the cylinder, lifting the slump cone vertically and stably, measuring the height difference between the slump height and the highest point of the slump sample, namely the slump difference, testing each sample for three times, taking the average value of the detection results, and filling in the table 1.
TABLE 1
| Detecting items | Compressive Strength/MPa | Splitting Strength/MPa | Slump/mm |
| Example 1 | 7.55 | 6.07 | 198 |
| Example 2 | 7.64 | 6.15 | 192 |
| Example 3 | 7.89 | 6.21 | 184 |
| Example 4 | 6.87 | 5.79 | 213 |
| Example 5 | 6.54 | 5.63 | 206 |
| Example 6 | 6.65 | 5.78 | 217 |
| Example 7 | 6.55 | 5.64 | 221 |
| Example 8 | 6.48 | 5.56 | 214 |
| Example 9 | 6.65 | 5.48 | 218 |
| Comparative example 1 | 6.07 | 5.14 | 234 |
| Comparative example 2 | 6.13 | 5.30 | 206 |
| Comparative example 3 | 6.22 | 5.41 | 208 |
| Comparative example 4 | 6.28 | 5.47 | 223 |
As shown in Table 1, the compressive strength of examples 1-3 is above 7.5MPa, the splitting strength is above 6MPa, and the slump is below 200mm, so that the cement stabilized macadam mixture prepared by the method has good compressive property, cracking resistance and strength.
As can be seen from table 1, example 4 differs from example 3 only in that: the amount of gneiss weighed in example 3 was 2.8g, the amount of polypropylene weighed was 25.2g, the amount of gneiss weighed in example 4 was 3.5g, the amount of polypropylene weighed was 24.5g, the compressive strength of example 4 was 6.87MPa, the cleavage strength was 5.79MPa, and the compressive property of example 4 was reduced as compared with example 3, because the excessive gneiss produced the phenomenon of agglomeration after the mass of gneiss was increased, the dispersion effect of gneiss in polypropylene was reduced, the interaction force between gneiss and polypropylene was reduced, the stability of composite gneiss was reduced, and the compressive property of cement stabilized macadam mixture was reduced.
As is clear from Table 1, the slump of example 3 was 184mm, the slump of example 4 was 213mm, and the slump of example 4 was higher than that of example 3, because the activity of the gneiss powder was lower, the secondary hydration reaction of cement was unfavorable after the content of gneiss was increased, the later strength development of cement stabilized macadam was difficult to be improved, wollastonite in the system was difficult to be filled with all gneiss, the water content in the voids of cement stabilized macadam was reduced, the free water content was increased, and the stability of cement stabilized macadam was reduced, and the slump of example 4 was increased.
As can be seen from table 1, example 5 differs from example 3 only in that: the amount of gneiss weighed in example 3 was 2.8g, the amount of polypropylene weighed was 25.2g, the amount of gneiss weighed in example 5 was 2g, the amount of polypropylene weighed was 26g, the compressive strength in example 5 was 6.54MPa, the cleavage strength was 5.63MPa, and the compressive property was reduced as compared with example 3, because the strength of the composite material was not sufficiently improved after the mass of gneiss was reduced, the component for reinforcing the rigidity strength of the system was reduced, the strength improvement phenomenon of polypropylene was not obvious, the overall strength of the composite gneiss was hardly improved, and the compressive property of the cement stabilized macadam of example 5 was hardly improved well, and the compressive property of the cement stabilized macadam was reduced.
As can be seen from table 1, example 6 differs from example 3 only in that: in example 3, the mass ratio of polylactic acid, polybutylene terephthalate and wollastonite is 6.3:3.8:1, in example 6, the mass ratio of polylactic acid, polybutylene terephthalate and wollastonite is 5.4:3.8:1, the compressive strength of example 6 is 6.65MPa, the cleavage strength is 5.78MPa, and the compressive property of example 6 is reduced compared with that of example 3, because, on the one hand, after the amount of wollastonite is reduced, the overall improvement strength of the polylactic acid blend system is difficult to obtain the optimal performance, and therefore, the overall compressive property of the cement stabilized macadam is reduced; on the other hand, the polybutylene terephthalate in the polylactic acid blending system has an excessive proportion, the continuous phase of the organic matrix is destroyed, and the phase separation phenomenon is easy to occur, so that the strength of the polylactic acid blending system is obviously reduced, the compressive strength and the splitting strength of the cement stabilized macadam are reduced, and the strength of the embodiment 6 is reduced.
As can be seen from table 1, example 7 differs from example 3 only in that: in example 3, the mass ratio of polylactic acid, polybutylene terephthalate and wollastonite is 6.3:3.8:1, in example 7, the mass ratio of polylactic acid, polybutylene terephthalate and wollastonite is 7.2:3.8:1, the compressive strength of example 7 is 6.55MPa, the cleavage strength is 5.64MPa, and the compressive property of example 7 is reduced compared with that of example 3, because the polylactic acid content is increased, the excessive polylactic acid is difficult to fully react and crosslink with polybutylene terephthalate, the compatibility is difficult to be improved, the entanglement degree of high molecular long chains is reduced, and meanwhile, the strength improvement of a high molecular polymer system is difficult to be improved because the wollastonite content is reduced, the stability of the system is reduced, the strength of cement stabilized macadam is difficult to be greatly improved, and the compressive strength and the cleavage strength of example 7 are reduced.
As can be seen from table 1, the only difference between example 8 and example 3 is: in example 3, the mass ratio of polylactic acid to polybutylene terephthalate to wollastonite is 6.3:3.8:1, in example 8, the mass ratio of polylactic acid to polybutylene terephthalate to wollastonite is 6.3:2.9:1, the compressive strength of example 8 is 6.48MPa, the cleavage strength is 5.56MPa, and the compressive property of example 8 is reduced compared with that of example 3, because the polybutylene terephthalate is difficult to fully react and crosslink with all polylactic acid after the proportion is reduced, the compatibility of the system is difficult to be improved, and at the same time, the wollastonite is easy to agglomerate after the content of silica fume is increased, so that the stability of the system is difficult to be improved, the stability of cement stabilized macadam is reduced, and both the compressive strength and the cleavage strength of example 8 are reduced.
As can be seen from table 1, the only difference between example 9 and example 3 is: in example 3, the mass ratio of polylactic acid, polybutylene terephthalate and wollastonite is 6.3:3.8:1, in example 9, the mass ratio of polylactic acid, polybutylene terephthalate and wollastonite is 6.3:4.7:1, the compressive strength of example 8 is 6.65MPa, the cleavage strength is 5.48MPa, and the compressive property of example 9 is reduced compared with that of example 3, because the organic matrix continuous phase is broken after the ratio of polybutylene terephthalate is too large, phase separation easily occurs, the strength of the polylactic acid blend system is reduced, the strength of cement stabilized macadam is difficult to improve, and the compressive strength and the cleavage strength of example 9 are reduced.
The slump of example 3 was 184mm, the slump of example 6 was 217mm, the slump of example 8 was 214mm, and the slump of example 6 was reduced compared with that of example 3, because, after the content of wollastonite was too much, wollastonite was agglomerated, on the one hand, the dispersion property of wollastonite in the system was reduced, and on the other hand, because of the agglomeration of wollastonite, it was difficult to fill gneiss well into wollastonite, so that part of gneiss impaired the development of the subsequent strength of cement, the water content in the voids of cement stabilized macadam was reduced, and the content of free water was increased, and therefore the slump of example 6 and example 8 was increased.
The slump of example 7 was 221 and the slump of example 9 was 218mm. The slump of example 3 was 184mm, and the slump of example 7 was higher than that of example 3, because it was difficult to fill all of the gneiss after the content of wollastonite was decreased, and the water content of the cement stabilized macadam was absorbed by part of the gneiss, and the free water content of the whole system was increased, which was not favorable for the increase in the strength of the cement subsequent to the system, so that the slumps of example 7 and example 9 were increased.
The only difference between comparative example 1 and example 3 is that: in comparative example 1, wollastonite was not added, the compressive strength of comparative example 1 was 6.07MPa, the cleavage strength was 5.14MPa, and the mechanical properties of the polymer material were hardly improved as compared with example 3, and the mechanical properties of the polylactic acid blend system were hardly improved as the wollastonite was not added, and the stability of the cement stabilized macadam was weak, and the compressive strength and cleavage strength of comparative example 1 were reduced
The slump of comparative example 1 was 234mm, which was increased as compared with example 3, because it was difficult to form a pozzolan effect by filling with gneiss after wollastonite was not added, and free water in the system was greatly increased along the water absorption of the gap between the stabilized macadam with cement, and the subsequent strength increase of cement was unfavorable, so that the slump of comparative example 1 was increased.
The only difference between comparative example 2 and example 3 is that: in comparative example 2, no butylene terephthalate was added, and both the compressive strength and the cleavage strength of comparative example 2 were reduced, because the toughness and the thermal stability of the entire polylactic acid blending system were reduced, and entanglement of long chains was not possible, and the mechanical properties of the entire system were reduced, so that both the compressive strength and the cleavage strength of comparative example 2 were reduced.
The only difference between comparative example 3 and example 3 is that: in comparative example 3, the compression strength and the cleavage strength were reduced compared with example 3, because the compatibility between polylactic acid and butylene terephthalate was poor, and the toughness of the whole system was reduced, so that the compression strength and the cleavage strength of comparative example 3 were reduced, without adding the compatibilizer ADR4380.
The only difference between comparative example 4 and example 3 is that: in comparative example 4, the compression strength and the cleavage strength were reduced as compared with example 3, because the surface of the gneiss was not organized after the addition of the silane coupling agent, the viscosity of the gneiss was large, and it was difficult to uniformly disperse the gneiss in the system, so that the stability of the modified gneiss was reduced, and the mutual filling effect between wollastonite and gneiss was reduced, so that the compression strength and the cleavage strength of the cement stabilized macadam were reduced, so that the compression strength and the cleavage strength of comparative example 4 were reduced, and the slump was increased.
The present embodiment is merely illustrative of the present application, and the present application is not limited thereto, and a worker can make various changes and modifications without departing from the scope of the technical idea of the present application. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of claims.
Claims (6)
1. A vibration-free self-curing cement stabilized macadam mixture is characterized in that: comprises the following components in parts by mass:
24-36 parts of cement
330-370 parts of graded broken stone
50-70 parts of river sand
37-41 parts of stone dust
24-32 parts of water
16-26 parts of polylactic acid blending system
45-65 parts of steel slag
20-35 parts of composite gneiss
2-4 parts of water reducer;
the polylactic acid blending system comprises: compatibilizer, polybutylene terephthalate, polylactic acid and wollastonite; the mass ratio of wollastonite to polybutylene terephthalate to polylactic acid is 1 (3.7-3.9) (6.2-6.4);
the preparation method of the composite gneiss comprises the following steps:
drying gneiss, adding the gneiss into an ethanol solution containing stearic acid after the gneiss is completely dried, heating, stirring at constant temperature, standing to room temperature, adding an ethanol solution containing a silane coupling agent, heating and stirring, carrying out ultrasonic treatment on the stirred suspension solution, steaming to evaporate absolute ethanol, and drying a sample to obtain dried modified gneiss; mixing the modified gneiss with polypropylene powder, performing injection molding, and crushing to obtain composite gneiss; the polylactic acid blending system is prepared by the following method:
pre-drying wollastonite fine powder, polylactic acid and polybutylene terephthalate, mixing the polylactic acid, the polybutylene terephthalate and a compatibilizer, extruding and granulating, drying the extruded granules, injecting and crushing to obtain the polylactic acid blending system.
2. The vibration-free self-curing cement stabilized macadam mixture as claimed in claim 1, wherein: the mass ratio of the gneiss to the polypropylene is 1 (9.5-10.5).
3. The vibration-free self-curing cement stabilized macadam mixture as claimed in claim 1, wherein: the silane coupling agent is KH570.
4. The vibration-free self-curing cement stabilized macadam mixture as claimed in claim 1, wherein: the compatibilizer is ADR4380.
5. The vibration-free self-curing cement stabilized macadam mixture as claimed in claim 1, wherein: the graded crushed stone comprises:
primary broken stone, secondary broken stone, tertiary broken stone and quaternary broken stone,
the particle size of the primary broken stone is 10-20mm, the particle size of the secondary broken stone is 20-50mm, the particle size of the tertiary broken stone is 50-150mm, and the particle size of the quaternary broken stone is 150-300mm.
6. A preparation method of a vibration-free self-curing cement stabilized macadam mixture is characterized by comprising the following steps of: the preparation method comprises the following steps:
s1, uniformly stirring graded broken stone, adding cement, river sand, stone scraps and steel slag, and stirring again;
s2, adding the composite gneiss, the polylactic acid blending system, the water reducer and water into the mixture obtained in the step S1, and uniformly stirring to obtain a cement stabilized macadam primary material;
and S3, maintaining the relative humidity of the cement stabilized macadam initial mixture obtained in the step S2 at more than 95% at the temperature of 20-22 ℃ for curing, and obtaining the cement stabilized macadam mixture after curing.
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