CN111847968B - Cement stabilized macadam microcrack additive and application thereof - Google Patents
Cement stabilized macadam microcrack additive and application thereof Download PDFInfo
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- CN111847968B CN111847968B CN202010708556.1A CN202010708556A CN111847968B CN 111847968 B CN111847968 B CN 111847968B CN 202010708556 A CN202010708556 A CN 202010708556A CN 111847968 B CN111847968 B CN 111847968B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
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- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
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Abstract
The invention discloses a cement stabilized macadam microcrack additive and application thereof, wherein the microcrack additive comprises a main component, an auxiliary component and water; the main component is selected from one or more of fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate and water-based bisphenol A epoxy resin emulsion; the auxiliary component is selected from one or more of mineral fiber, curing agent, emulsifier, stabilizer and dispersant. After the microcrack additive is doped into a cement stabilized macadam material, the bonding of an aggregate-mortar interface can be randomly weakened, so that the shrinkage of a mortar phase is randomly dispersed among aggregate systems, and the phenomenon that cracks in a traditional semi-rigid base layer can be expanded and communicated to form long and wide cracks is avoided; the series problems caused by long and wide cracks and slab staggering of the traditional cement stabilized macadam can be thoroughly solved; the later excavation type repairing measures are avoided, the engineering maintenance capital investment is greatly saved from the whole life cycle, and the whole life cost and economic benefits are remarkable.
Description
Technical Field
The invention belongs to the technical field of road materials and pavement structures, and particularly relates to a cement stabilized macadam microcrack additive and application thereof.
Background
The cement stabilized macadam (semi-rigid) base course is the most commonly used load-bearing base course type of road surfaces of various grades in China, but the cement stabilized macadam base course is easy to generate shrinkage cracks and plate fracture, so that a series of secondary diseases such as reflection cracks are induced on an asphalt surface layer, and the deterioration of the performance of the road surface is accelerated. The cracks of the base layer are concealed, the detection and treatment cost is high, and once the cracks are usually destroyed, the cracks need to be dug and rebuilt in a 'rifling and belly breaking' mode, so that the cracks are an aeipathia which influences the long life of the semi-rigid base layer asphalt pavement.
For a long time, road workers have tried to improve the self-resistance of cement stabilized macadam from various angles (framework dense structure, heavy compaction, expansion compensation, vibration stirring, etc.) to meet the requirements of load and environmental effects. However, from the perspective of concrete materials, cement consumption of the cement-stabilized macadam is small (about 5%), mortar cement is large (about 1.0%), aggregate strength and particle type are poor, parameters such as strength, modulus and shrinkage coefficient of the cement-stabilized macadam formed by rolling are in a complex combined state, and nonuniformity of the cement-stabilized macadam on a microscopic scale is very obvious due to a large amount of weak bonding and initial defects among particles. The improvement range of homogeneity through materials and construction technology is far lower than the self-nonuniformity, the superposition of the support of a lying layer is nonuniform, and the plate fracture of the cement stabilized macadam base layer under the long-term action of load is inevitable; meanwhile, weak bonding caused by the defects of the traditional cement stabilized macadam aggregate-mortar interface is not weak enough, so that random cracking can be realized in the temperature shrinkage and drying shrinkage process, and the plate body property of the cement stabilized macadam base layer is reserved to a certain extent, so that long and wide through cracks are easily formed. The traditional scheme of increasing the cement dosage and improving the crack resistance of cement stabilized macadam can simultaneously increase the shrinkage coefficient of the macadam, and natural cracking or artificial pre-cutting cracks can generate long and wide cracks to induce reflection cracks and sink into bottlenecks in research.
Under the background, the design idea of the cement stabilized macadam material with controllable microcracks is urgently needed to be provided, the plate body property of the cement stabilized macadam base layer is weakened through weakening the bonding of an aggregate-mortar interface, the miniaturization of crack width and length is realized, and the difference of slab staggering and modulus is weakened slightly.
Disclosure of Invention
The invention aims to provide a microcrack additive for cement stabilized macadam and application thereof aiming at the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main component is selected from one or more of fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate and water-based bisphenol A epoxy resin emulsion; the auxiliary component is selected from one or more of mineral fiber, curing agent, emulsifier, stabilizer and dispersant.
According to the preferable scheme of the micro-cracking additive for the cement stabilized macadam, the main components are fatty glyceride and polyoxyethylene ether-20 oil acyl ricinoleate; the auxiliary component is an emulsifier; the weight portions of the components are respectively as follows based on 100 weight portions: 45-50 parts of fatty glyceride, 8-10 parts of polyoxyethylene ether-20-oleoyl ricinoleate, 20-25 parts of emulsifier and the balance of water.
The fatty glyceride, the polyoxyethylene ether-20 oil acyl ricinoleate, the emulsifier and the drinking water are sheared and stirred at a high speed to form aqueous emulsion, and the aqueous emulsion is sprayed on the surface of the aggregate to form the low-modulus coating.
According to the preferable scheme of the cement stabilized macadam microcrack additive, the main component is water-based bisphenol A epoxy resin emulsion; the auxiliary components are a curing agent and a stabilizing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 18-35 parts of water-based bisphenol A epoxy resin emulsion, 10-16 parts of curing agent, 5-8 parts of stabilizer and the balance of water.
The aqueous bisphenol A epoxy resin emulsion, the curing agent, the stabilizer and water are subjected to high-speed shearing and stirring to form the aqueous emulsion, and the aqueous emulsion is sprayed on the surface of the aggregate to form the high-modulus coating.
According to the preferable scheme of the micro-cracking additive for the cement stabilized macadam, the main components are fatty glyceride, polyoxyethylene ether-20 oil acyl ricinoleate and water-based bisphenol A epoxy resin emulsion; the auxiliary components comprise mineral fibers, a curing agent, an emulsifier, a stabilizer and a dispersing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 11-16 parts of fatty glyceride, 2-3 parts of polyoxyethylene ether-20-oleoyl ricinoleate, 8-12 parts of water-based bisphenol A epoxy resin emulsion, 1-2 parts of mineral fiber, 4-6 parts of curing agent, 6-10 parts of emulsifier, 4-8 parts of stabilizer, 4-7 parts of dispersant and the balance of water.
The fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate, water-based bisphenol A epoxy resin emulsion, mineral fiber, curing agent, emulsifier, stabilizer, dispersant and water are sheared and stirred at high speed to form water-based emulsion which is sprayed on the surface of the aggregate.
In the invention, the selected fatty glyceride has low melting point and can keep fluid state at normal temperature, and the polyoxyethylene ether-20 oil acyl castor oil alcohol ester is a nonionic liquid emulsifier, has the characteristic of balance between oleophylic value and hydrophilic value, and can ensure that the fatty glyceride is uniformly and stably dispersed in the aqueous solution. The emulsion formed by the fatty glyceride, the polyoxyethylene ether-20 oleoyl ricinoleate, the emulsifier and the water has mechanical characteristics which do not change along with the temperature and the cement hydration process, and a thin layer structure with lower modulus is formed in the cement stabilized macadam. The aqueous bisphenol A epoxy resin emulsion has mature industrial production and stable performance, and the emulsion formed by the aqueous bisphenol A epoxy resin emulsion and the curing agent and the stabilizing agent gradually starts a curing reaction after the cement stabilized macadam is added, and finally a thin-layer structure with the modulus higher than that of cement mortar is formed in the cement stabilized macadam.
The invention further discloses that the curing agent adopts diethylenetriamine; the emulsifier adopts tallow tetramine; the stabilizer is polyacrylamide; the dispersing agent adopts sodium dodecyl sulfate.
The addition of the microcrack additive needs to add a special metering system in a conventional cement stabilized macadam mixing station; the invention also provides a metering system of the cement stabilized macadam microcrack additive, which comprises a microcrack additive storage barrel, an anticorrosive submersible pump, an electromagnetic valve, a numerical control flowmeter, a valve controller, a supercharger and an atomizing spray head; the anticorrosion submersible pump is arranged at the bottom of the microcrack additive storage barrel; the atomizing spray head is arranged 20-50 cm above a conveyor belt of a broken stone discharging bin with the particle size larger than 10 mm; the atomization nozzle is connected with an anticorrosive submersible pump in the microcrack additive storage barrel through a connecting pipeline; the electromagnetic valve and the numerical control flowmeter are arranged on a connecting pipeline between the atomizing spray head and the anticorrosive submersible pump; the supercharger is arranged on a connecting pipeline close to the atomizing nozzle; the valve controller is respectively connected with the electromagnetic valve, the numerical control flowmeter and the supercharger.
Further preferably, the atomizing spray head is arranged 20cm above a conveyor belt of a broken stone discharging bin with the particle size of 10-25 mm.
Further, the valve controller is an integrated controller established based on a PLC or MCU or ARM control chip.
The microcrack additive for cement stabilized macadam is applied to the construction of a microcrack cement stabilized macadam base.
In construction application, the proportion of the cement stabilized macadam added with the microcrack additive is selected according to the existing technical rules for constructing road surface bases (JTG/T F20) and the test regulations for inorganic binder stabilizing materials for highway engineering (JTG E51) on aggregate grading curve, cement dosage determination, optimal water consumption determination, and dosage determination of the microcrack additive.
Preferably, the dosage of the micro-cracking additive for cement stabilized macadam is that the total specific surface area A of the macadam with the particle size of more than 10mm in each ton of cement stabilized macadam is multiplied by the total weight M multiplied by 0.005 of the macadam with the particle size of more than 10 mm.
Preferably, the aggregate grading curve is of a skeleton compact type, and when the maximum aggregate particle size is 37.5mm, the 26.5mm grade passage rate is 60%, the 13.2mm grade passage rate is 55%, and the 0.3mm grade passage rate is 5%; when the maximum grain size of the aggregate is 26.5mm, the 16mm grade passage rate is 60%, the 9.5mm grade passage rate is 55% and the 0.3mm grade passage rate is 5%.
Preferably, the cement dosage of the cement-stabilized macadam subbase is 5%, and the cement dosage of the cement-stabilized macadam base is 6% -7%.
The construction method of the microcrackable cement stabilized macadam foundation is carried out according to the related technical requirements of the existing technical Specification for highway pavement foundation construction (JTG/T F20), and has no special requirements.
The invention has the advantages that:
when the cement stabilized macadam material prepared by the microcrack additive is added, the bonding of the aggregate-mortar interface can be randomly weakened, so that the shrinkage of a mortar phase can be randomly dispersed among aggregate systems, and the phenomenon that cracks in a traditional semi-rigid base layer can be expanded and communicated to form long and wide cracks is avoided; the reduction of the bearing capacity of the cement stabilized macadam by interface weakening is compensated by a skeleton embedding and squeezing structure with stronger internal friction resistance formed by aggregate and reinforced mortar, the cement stabilized macadam with interface weakening still has the integral characteristic of no wide crack in macroscopic view, and the series problems caused by long and wide cracks and slab staggering of the traditional cement stabilized macadam can be thoroughly solved; the later excavation type repairing measures are avoided, the engineering maintenance capital investment is greatly saved from the whole life cycle, and the whole life cost and economic benefits are remarkable.
Drawings
FIG. 1 is a schematic diagram of a metrology system in accordance with an embodiment of the present invention.
FIG. 2 is a graph of a road segment fracture without the addition of a microcracking additive.
FIG. 3 is a graph showing the effect of microcracking at locations of increased fines after incorporation of a microcracking additive.
FIG. 4 is a graph of the effect of normal road sections after incorporation of a microcrack additive.
FIG. 5 is a schematic illustration of a road section microcrack width after incorporation of a microcracking additive.
Reference numerals: 1-a microcrack additive storage barrel, 2-an anticorrosive submersible pump, 3-an electromagnetic valve and a numerical control flowmeter, 4-a valve controller, 5-a connecting pipeline, 6-a supercharger, 7-an atomizing nozzle, 8-a conveyor belt and 9-a broken stone discharging bin.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride and polyoxyethylene ether-20 oleoyl ricinoleate; the auxiliary component is an emulsifier; the weight portions of the components are respectively as follows based on 100 weight portions: 45 parts of fatty glyceride, 8 parts of polyoxyethylene ether-20 oil acyl castor oil acid ester, 20 parts of emulsifier and the balance of water. The emulsifier adopts tallow tetramine.
Example 2:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride and polyoxyethylene ether-20 oleoyl ricinoleate; the auxiliary component is an emulsifier; the weight portions of the components are respectively as follows based on 100 weight portions: 50 parts of fatty glyceride, 10 parts of polyoxyethylene ether-20 oil acyl ricinoleate, 25 parts of emulsifier and the balance of water. The emulsifier adopts tallow tetramine.
Example 3:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride and polyoxyethylene ether-20 oleoyl ricinoleate; the auxiliary component is an emulsifier; the weight portions of the components are respectively as follows based on 100 weight portions: 45 parts of fatty glyceride, 10 parts of polyoxyethylene ether-20 parts of oil acyl ricinoleate, 20 parts of emulsifier and the balance of water. The emulsifier adopts tallow tetramine.
Example 4:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride and polyoxyethylene ether-20 oleoyl ricinoleate; the auxiliary component is an emulsifier; the weight portions of the components are respectively as follows based on 100 weight portions: 47 parts of fatty glyceride, 9 parts of polyoxyethylene ether-20 oil acyl ricinoleate, 24 parts of emulsifier and the balance of water. The emulsifier adopts tallow tetramine.
Example 5:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main component is water-based bisphenol A epoxy resin emulsion; the auxiliary components are a curing agent and a stabilizing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 18 parts of waterborne bisphenol A epoxy resin emulsion, 10 parts of curing agent, 5 parts of stabilizer and the balance of water. The curing agent adopts diethylenetriamine; the stabilizer is polyacrylamide.
Example 6:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main component is water-based bisphenol A epoxy resin emulsion; the auxiliary components are a curing agent and a stabilizing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 35 parts of waterborne bisphenol A epoxy resin emulsion, 16 parts of curing agent, 8 parts of stabilizer and the balance of water. The curing agent adopts diethylenetriamine; the stabilizer is polyacrylamide.
Example 7:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main component is water-based bisphenol A epoxy resin emulsion; the auxiliary components are a curing agent and a stabilizing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 30 parts of waterborne bisphenol A epoxy resin emulsion, 13 parts of curing agent, 7 parts of stabilizer and the balance of water. The curing agent adopts diethylenetriamine; the stabilizer is polyacrylamide.
Example 8:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main component is water-based bisphenol A epoxy resin emulsion; the auxiliary components are a curing agent and a stabilizing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 18 parts of waterborne bisphenol A epoxy resin emulsion, 16 parts of curing agent, 6 parts of stabilizer and the balance of water. The curing agent adopts diethylenetriamine; the stabilizer is polyacrylamide.
Example 9:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate and aqueous bisphenol A epoxy resin emulsion; the auxiliary components comprise mineral fibers, a curing agent, an emulsifier, a stabilizer and a dispersing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 11 parts of fatty glyceride, 2 parts of polyoxyethylene ether-20 parts of oleoyl ricinoleate, 8 parts of waterborne bisphenol A epoxy resin emulsion, 1 part of mineral fiber, 4 parts of curing agent, 6 parts of emulsifier, 4 parts of stabilizer, 4 parts of dispersant and the balance of water. The curing agent adopts diethylenetriamine; the emulsifier adopts tallow tetramine; the stabilizer is polyacrylamide; the dispersing agent adopts sodium dodecyl sulfate.
Example 10:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate and aqueous bisphenol A epoxy resin emulsion; the auxiliary components comprise mineral fibers, a curing agent, an emulsifier, a stabilizer and a dispersing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 16 parts of fatty glyceride, 3 parts of polyoxyethylene ether-20 oil acyl ricinoleate, 12 parts of water-based bisphenol A epoxy resin emulsion, 2 parts of mineral fiber, 6 parts of curing agent, 10 parts of emulsifier, 8 parts of stabilizer, 7 parts of dispersant and the balance of water. The curing agent adopts diethylenetriamine; the emulsifier adopts tallow tetramine; the stabilizer is polyacrylamide; the dispersing agent adopts sodium dodecyl sulfate.
Example 11:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate and aqueous bisphenol A epoxy resin emulsion; the auxiliary components comprise mineral fibers, a curing agent, an emulsifier, a stabilizer and a dispersing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 13 parts of fatty glyceride, 2 parts of polyoxyethylene ether-20 oil acyl ricinoleate, 10 parts of water-based bisphenol A epoxy resin emulsion, 1 part of mineral fiber, 5 parts of curing agent, 8 parts of emulsifier, 6 parts of stabilizer, 5 parts of dispersant and the balance of water. The curing agent adopts diethylenetriamine; the emulsifier adopts tallow tetramine; the stabilizer is polyacrylamide; the dispersing agent adopts sodium dodecyl sulfate.
Example 12:
a cement stabilized macadam microcrack additive comprises a main component, an auxiliary component and water; the main components are fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate and aqueous bisphenol A epoxy resin emulsion; the auxiliary components comprise mineral fibers, a curing agent, an emulsifier, a stabilizer and a dispersing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 11 parts of fatty glyceride, 3 parts of polyoxyethylene ether-20 parts of oleoyl ricinoleate, 12 parts of waterborne bisphenol A epoxy resin emulsion, 2 parts of mineral fiber, 4 parts of curing agent, 10 parts of emulsifier, 4 parts of stabilizer, 5 parts of dispersant and the balance of water. The curing agent adopts diethylenetriamine; the emulsifier adopts tallow tetramine; the stabilizer is polyacrylamide; the dispersing agent adopts sodium dodecyl sulfate.
Example 13:
a metering system of a microcrack additive for cement stabilized macadam comprises a microcrack additive storage barrel 1, an anticorrosive submersible pump 2, an electromagnetic valve and numerical control flowmeter 3, a valve controller 4, a supercharger 6 and an atomizing spray head 7; the anticorrosion submersible pump 2 is arranged at the bottom of the microcrack additive storage barrel 1; the atomizing spray head 7 is arranged 20cm above a conveyor belt 8 of a broken stone blanking bin with the particle size larger than 10-25 mm; the atomizing spray head 7 is connected with the anticorrosive submersible pump 2 in the microcrack additive storage barrel 1 through the connecting pipeline 5; the electromagnetic valve and the numerical control flowmeter 3 are arranged on a connecting pipeline between the atomizing nozzle 7 and the anticorrosive submersible pump 2; the supercharger 6 is arranged on a connecting pipeline close to the atomizing nozzle 7; the valve controller 4 is respectively connected with the electromagnetic valve, the numerical control flowmeter 3 and the supercharger 6. The valve controller is based on an integrated controller established by a PLC control chip.
Example 14:
as shown in fig. 1, a metering system of a microcrack additive for cement stabilized macadam comprises a microcrack additive storage barrel 1, an anticorrosion submersible pump 2, an electromagnetic valve and numerical control flowmeter 3, a valve controller 4, a supercharger 6 and an atomizing nozzle 7; the anticorrosion submersible pump 2 is arranged at the bottom of the microcrack additive storage barrel 1; the atomizing spray head 7 is arranged 30cm above a conveyor belt 8 of a broken stone blanking bin with the particle size of more than 20-30 mm; the atomizing spray head 7 is connected with the anticorrosive submersible pump 2 in the microcrack additive storage barrel 1 through the connecting pipeline 5; the electromagnetic valve and the numerical control flowmeter 3 are arranged on a connecting pipeline between the atomizing nozzle 7 and the anticorrosive submersible pump 2; the supercharger 6 is arranged on a connecting pipeline close to the atomizing nozzle 7; the valve controller 4 is respectively connected with the electromagnetic valve, the numerical control flowmeter 3 and the supercharger 6. And the valve controller is an integrated controller established based on the MCU control chip.
Example 15:
a metering system of a cement stabilized macadam microcrack additive comprises a microcrack additive storage barrel 1, an anticorrosive submersible pump 2, an electromagnetic valve and numerical control flowmeter 3, a valve controller 4, a supercharger 6 and an atomizing spray head 7; the anticorrosion submersible pump 2 is arranged at the bottom of the microcrack additive storage barrel 1; the atomizing spray head 7 is arranged 50cm above a conveyor belt 8 of a broken stone blanking bin with the particle size larger than 30-50 mm; the atomizing spray head 7 is connected with the anticorrosive submersible pump 2 in the microcrack additive storage barrel 1 through the connecting pipeline 5; the electromagnetic valve and the numerical control flowmeter 3 are arranged on a connecting pipeline between the atomizing nozzle 7 and the anticorrosive submersible pump 2; the supercharger 6 is arranged on a connecting pipeline close to the atomizing nozzle 7; the valve controller 4 is respectively connected with the electromagnetic valve, the numerical control flowmeter 3 and the supercharger 6. The valve controller is an integrated controller established based on an ARM control chip.
The application of the microcrack additive for cement stabilized macadam of the embodiment in the construction of a microcrackable cement stabilized macadam foundation.
Application example 1:
compared with the influence of different doping amounts of the microcrack additives on the unconfined compressive strength of the cement stabilized macadam 7d, the doping proportion of each grade of aggregate is 0-3 mm: 3-5 mm: 5-10 mm: 10-20 mm: 20-30 mm: 26:8:10:30:26, the cement is ordinary portland cement (P.O 42.5.5), the cement consumption is 4%, and the optimal water content is 4.6%.
Three sets of 7-day unconfined compressive strength tests were performed, with 9 parallel specimens per set. The 1 st group is not added with the microcrack additive according to the optimal proportion, the doping amount of the 2 nd group of microcrack additive is 5 percent of the dosage of the cement, and the doping amount of the 3 rd group of microcrack additive is 10 percent of the dosage of the cement.
According to the maximum dry density and the optimum water content determined by the compaction test result, calculating the test piece mass required by preparing the unconfined test piece according to the specified 99% compaction degree, and forming the unconfined strength test piece. The mixture is controlled within 1 hour from the time when cement is added and mixed to the time when the test piece is formed, and the mixture which exceeds 1 hour is discarded. The microcrack additive is weighed, mixed with water uniformly, added with 10-20 mm broken stone, mixed for 10s, and then mixed with other materials and stirred for 10 s.
Once the unconfined test piece formed by static compaction is demoulded and weighed, the unconfined test piece is immediately wrapped by a plastic film and then placed into a curing chamber for curing, the temperature of the curing chamber is kept at 20 +/-2 ℃, and the humidity is more than or equal to 95%. Taking out the test piece after 6 days of health preservation, removing the film, immersing the test piece in water, taking out the test piece before pressure testing, wiping off free water on the surface by using a soft cloth, slightly drying and weighing the surface, and then testing the pressure to obtain 7-day unconfined compressive strength.
Specific test results are shown in table 1. The representative value of unconfined compressive strength of the blank group 7d is 4.8MPa, and the coefficient of variation is 0.3 percent; the 5 percent mixing amount and 7d unconfined compressive strength have the representative value of 4.4MPa and the coefficient of variation of 0.5 percent; the 10 percent doping amount and 7d unconfined compressive strength have the representative value of 5.1MPa and the coefficient of variation of 0.6 percent. All meet the strength requirement of the subbase (not less than 3.0 MPa).
TABLE 1 underlayers 7d unconfined compressive strength test data
Application example 2:
and (3) comparing the influence of different doping amounts of the microcrack additive on the field cracking condition of the cement stabilized macadam subbase.
And totally paving four subbase observation road sections, namely a normal section, a microcrack I section, a microcrack II section and a microcrack III section. The specific information is as follows:
a normal section: the mixing proportion of the aggregate is 0-3 mm: 3-5 mm: 5-10 mm: 10-20 mm: 20-30 mm: 26:8:10:30: 26. 4% of cement dosage and 4.6% of water content. Paving the concrete in 2017, 6 and 28 months, and paving the concrete with the pile number of K2+ 900-K3 + 000.
Microcracking stage I: the mixture ratio is the same as above, and the mixing amount of the microcrack additive is 5 percent of the dosage of the cement. Paving the concrete in 2017, 6 and 28 months, and paving the concrete in left ranges of pile numbers K2+ 450-K2 + 750.
Microcracking stage II: the mixture ratio is the same as above, and the mixing amount of the microcrack additive is 10 percent of the dosage of the cement. Paving in 2017, 6 and 28 days in month, and paving in left range of pile numbers K2+ 750-K2 + 900. And paving in 7 and 16 months in 2017, and paving with the pile number K5+ 230-K5 +520 on the right.
Microcracking stage III: the mixture ratio is the same as above, and the mixing amount of the microcrack additive is 20 percent of the dosage of the cement. Paving the concrete in 2017, 7 and 18 days, and paving the concrete in right range of the pile number K7+ 100-K7 + 400.
The construction, transportation, paving and rolling of the contrast section and the micro-crack section are not problematic, and the compactness meets the requirement. The cracking condition of the observed road section after being paved for 14 days is measured, and the results are shown in table 2, and it can be found that:
the total length of the comparison section is 100m, the number of macro cracks is 6, the crack width is 0.3-0.8 mm, and the average crack width is 0.45 mm; the crack spacing is 1-35 m, and the average crack spacing is 20 m.
The total length of a 5% micro-crack additive mixing amount test section is 300m, the number of macro cracks is 12, the crack width is 0.1-0.5 mm, and the average crack width is 0.28 mm; the crack spacing is 1-25 m, and the average crack spacing is 27 m.
The total length of the second testing section is 290m, and the number of the macro cracks is 0.
The total length of a 10 percent micro-crack additive mixing amount test section is 150m, the number of macro cracks is 1, and the width of the cracks is 0.4 mm.
The total length of the second 10% micro-crack additive mixing amount test section is 300m, and the number of macro cracks is 0.
It can be found that the low-doped (5%) micro-crack additive can reduce the width of the macro-cracks and increase the crack spacing, and the high-doped (10% -20%) micro-crack additive can effectively eliminate the macro-cracks.
TABLE 2 sub-base microcrack test segment crack condition statistics
Core samples are drilled at the pile number of K2+500 with the amount of the microcrack additive of 5%, the pile number of K2+755 with the amount of the microcrack additive of 10% and the pile number of the blank section K2+ 945. The core sample condition is shown in the figure, and the core sample is complete when the micro-crack additive is 5 percent in mixing amount; 10 percent of micro-crack additive is added, and the core sample is complete; the blank section has a more complete core sample.
Application example 3:
the semi-rigid base course microcracking technology does not have special requirements on the material performance of cement-stabilized gravel or broken stone, and is implemented according to the relevant regulations of the existing Highway pavement base course construction technical rules (JTGT F20). The test adopts the base layer and the subbase layer which meet the fine rule to carry out the indoor test. The cement is ordinary portland cement (P.O42.5), and the aggregates (0-3 mm, 3-5 mm, 5-10 mm, 10-20 mm and 20-30 mm) are raw materials allowed to be used for the base layer.
Finally, the optimal blending proportion of each grade of the base layer is determined to be 0-5 mm: 5-10 mm: 10-20 mm: 20-30 mm: 32:20:29: 19. Carrying out compaction test to obtain the maximum dry density of 2.373g/cm when the cement dosage is 5%3The optimum water content is 4.7%.
The optimal blending ratio of each grade of the subbase layer is 0-5 mm: 5-10 mm: 10-20 mm: 20-30 mm: 32:17:29: 22. Carrying out compaction test to obtain the maximum dry density of 2.358g/cm when the cement dosage is 3.5%3The optimum water content is 4.7%.
Considering that the cement and the stone powder are replaced by fly ash to a certain extent, five groups of 7-day unconfined compressive strength tests are carried out, and each group comprises 9 parallel test pieces.
The 1 st group is according to the best proportion, the cement mixing amount is 5 percent (external mixing), and the micro-crack additive mixing amount is 10 percent of the cement dosage;
the group 2 comprises 4.7 percent of cement (doped), 0.3 percent of fly ash (doped) and 0 percent of microcrack additive according to the optimal mixture ratio;
the 3 rd group is prepared according to the optimal proportion, wherein the cement mixing amount is 4.7 percent (external mixing), the fly ash mixing amount is 0.3 percent (external mixing), and the micro-cracking additive mixing amount is 10 percent of the cement dosage;
the 4 th group is prepared according to the optimal proportion, wherein the cement content is 4 percent (external doping), the fly ash content is 6 percent (internal doping), and the microcrack additive content is 0;
the 5 th group is prepared according to the optimal proportion, wherein the cement mixing amount is 4 percent (external mixing), the fly ash mixing amount is 6 percent (internal mixing), and the micro-crack additive mixing amount is 10 percent of the cement dosage.
According to the maximum dry density and the optimum water content determined by the compaction test result, calculating the test piece mass required by preparing the unconfined test piece according to the specified 99% compaction degree, and forming the unconfined strength test piece. The mixture is controlled within 1 hour from the time when cement is added and mixed to the time when the test piece is formed, and the mixture which exceeds 1 hour is discarded. The microcrack additive is weighed, mixed with water uniformly, added with 10-20 mm broken stone, mixed for 10s, and then mixed with other materials and stirred for 10 s.
Once the unconfined test piece formed by static compaction is demoulded and weighed, the unconfined test piece is immediately wrapped by a plastic film and then placed into a curing chamber for curing, the temperature of the curing chamber is kept at 20 +/-2 ℃, and the humidity is more than or equal to 95%. Taking out the test piece after 6 days of health preservation, removing the film, immersing the test piece in water, taking out the test piece before pressure testing, wiping off free water on the surface by using a soft cloth, slightly drying and weighing the surface, and then testing the pressure to obtain 7-day unconfined compressive strength.
Specific test results are shown in table 3. The representative value of the unconfined compressive strength of the group 1 and 7d is 6.4 MPa; the representative value of the unconfined compressive strength of the group 2 d 7d is 6.6 MPa; the representative value of the unconfined compressive strength of the group 3 d 7d is 5.7 MPa; the representative value of the unconfined compressive strength of the group 4 d 7d is 5.6 MPa; the representative unconfined compressive strength of group 5 d, 7d, was 6.6 MPa. All meet the requirement of base strength (not less than 5.0 MPa).
TABLE 3 test data of unconfined compressive strength of base layer 7d
Application example 4:
and (3) comparing the influence of different doping amounts of the microcrack additive on the field cracking condition of the cement stabilized macadam base.
Four groups of test sections are paved, namely a normal section, a microcrack I section, a microcrack II section and a microcrack III section. The specific information is as follows:
a normal section: a subbase layer, the cement dosage is 3.5%, and the water content is 4.7%; the cement dosage of the upper and lower base layers is 4.5 percent, and the water content is 4.7 percent. Paving in 2017 in 1-3 days in 9 months, and paving in the right range of the pile number K49+ 420-K51 + 980.
Microcracking stage I: only the upper base layer is doped with the microcrack additive, and the proportion is the same as that of the microcrack additive, wherein the doping amount of the microcrack additive is 10 percent. Paving in 2017, 9, 12-13 days, and left pile number K50+ 980-K51 + 720.
Microcracking stage II: the upper and lower base layers are doped with the microcrack additive, and the proportion is the same as that of the microcrack additive, wherein the doping amount of the microcrack additive is 10 percent. The lower base layer is paved in 2017, 9 and 4 months, and the pile number is K49+ 400-K50 + 390. The upper base course is paved in 2017, 9, 10 to 11 days, and the pile number is K49+420 to K50+ 400.
Microcracking stage III: the base layer, the upper base layer and the lower base layer are all doped with the microcrack additive, and the proportion is the same as that of the microcrack additive, and the doping amount of the microcrack additive is 10 percent. And 6, paving the underlayer in 2017 in 9 months and 13-14 days, and paving the underlayer in left range of pile numbers K47+ 930-K48 + 770. The proportion of the upper and lower base layers is the same as above, and the mixing amount of the microcrack additive is 10 percent. The pile numbers of the lower base layer test sections are K47+ 930-K48 + 920. The pile numbers of the upper base layer test sections are K47+ 930-K48 + 928.
The normal section and the micro-crack section are not problematic in construction, transportation, paving and rolling, and the compactness meets the requirement. The full length of the blank section is 1560m, the condition of the cracks of the lower base layer is observed, the number of macro cracks is 22, and the width of the cracks is 0.5-2.0 mm; the crack spacing is not equal to 5-200 m.
And the base layer on the microcrack I section has no macro cracks.
The upper base layer of the microcrack II section has 1 construction joint, and other macrocracks do not appear on the upper base layer and the lower base layer.
The microcracked stage III underlayers did not exhibit macrocracks.
It was found that 10% of the amount of microcracking additive was effective in eliminating macrocracks in the semi-rigid base layer.
It should be understood that the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the practice of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description; this is not necessary, nor exhaustive, of all embodiments; and obvious variations or modifications are intended to be within the scope of the present invention.
Claims (5)
1. The cement stabilized macadam microcrack additive is characterized by comprising a main component, an auxiliary component and water; the main components are fatty glyceride, polyoxyethylene ether-20 oleoyl ricinoleate and aqueous bisphenol A epoxy resin emulsion; the auxiliary components comprise mineral fibers, a curing agent, an emulsifier, a stabilizer and a dispersing agent; the weight portions of the components are respectively as follows based on 100 weight portions: 11-16 parts of fatty glyceride, 2-3 parts of polyoxyethylene ether-20 parts of oil acyl castor oil acid ester, 8-12 parts of water-based bisphenol A epoxy resin emulsion, 1-2 parts of mineral fiber, 4-6 parts of curing agent, 6-10 parts of emulsifier, 4-8 parts of stabilizer, 4-7 parts of dispersant and the balance of water.
2. The cement stabilized macadam microcracking additive of claim 1, wherein: the curing agent adopts diethylenetriamine; the emulsifier adopts tallow tetramine; the stabilizer is polyacrylamide; the dispersing agent adopts sodium dodecyl sulfate.
3. A system for metering a microcracking additive for cement stabilized macadams according to claim 1 or 2, characterized in that: comprises a microcrack additive storage barrel (1), an anticorrosive submersible pump (2), an electromagnetic valve, a numerical control flowmeter (3), a valve controller (4), a supercharger (6) and an atomizing spray head (7); the anti-corrosion submersible pump (2) is arranged at the bottom of the microcrack additive storage barrel (1); the atomizing spray head (7) is arranged 20-50 cm above a conveyor belt (8) of a broken stone blanking bin with the particle size larger than 10 mm; the atomizing spray head (7) is connected with the anticorrosive submersible pump (2) in the microcrack additive storage barrel (1) through a connecting pipeline (5); the electromagnetic valve and the numerical control flowmeter (3) are arranged on a connecting pipeline between the atomizing nozzle (7) and the anticorrosive submersible pump (2); the supercharger (6) is arranged on a connecting pipeline close to the atomizing nozzle (7); the valve controller (4) is respectively connected with the electromagnetic valve, the numerical control flowmeter (3) and the supercharger (6).
4. The system of claim 3, wherein the system further comprises: the atomizing nozzle (7) is arranged 20cm above a conveyor belt (8) of a broken stone discharging bin with the particle size of 10-25 mm.
5. Use of the microcracking additive according to claim 1 or 2 in microcrackable cement stabilized macadam foundation construction.
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