CN115448655A - Pavement base material based on construction waste and preparation method thereof - Google Patents
Pavement base material based on construction waste and preparation method thereof Download PDFInfo
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- CN115448655A CN115448655A CN202211415480.9A CN202211415480A CN115448655A CN 115448655 A CN115448655 A CN 115448655A CN 202211415480 A CN202211415480 A CN 202211415480A CN 115448655 A CN115448655 A CN 115448655A
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Road Paving Structures (AREA)
Abstract
The invention provides a pavement base material based on construction waste, which comprises a basic component and an external doping agent; the base component comprises the following components in parts by weight: 30-40 parts of engineering slag soil, 25-35 parts of decoration garbage, 10-15 parts of garbage incineration fly ash, 2-5 parts of cement, 2-5 parts of slag and 15-20 parts of water; the total mass part of the basic components is 100 parts; the external admixture comprises alkylphenol polyoxyethylene, sodium dodecyl sulfate and glycerol; the mass of the alkylphenol polyoxyethylene is 3-5% of the waste incineration fly ash; the mass of the sodium dodecyl sulfate is 1 to 3 percent of the waste incineration fly ash; the mass of the glycerol is 1 to 3 percent of the waste incineration fly ash. The invention can improve the performance of the pavement base material and reduce the toxicity of the pavement base material.
Description
Technical Field
The invention relates to a pavement base material, in particular to a pavement base material based on construction waste and a preparation method thereof.
Background
The construction waste is proposed to be used for the pavement base material in the prior art, but because the performance of the construction waste regenerated aggregate is lower than that of natural gravels and the quality of the construction waste regenerated product is difficult to guarantee, the specific application process of the construction waste in the pavement base material still needs to be greatly explored to meet the performance requirement of the pavement base material.
In addition, when the construction waste is used for the base pavement material, in order to improve the scale of resource utilization, in addition to the conventional construction waste, other waste is generally added into the base pavement material, and when the other waste has low performance and toxicity, the performance of the base pavement material is further reduced, and certain toxicity is generated on the base pavement material.
In view of the above, there is a need for a pavement base material based on construction waste and a preparation method thereof, so as to solve or at least alleviate the technical defects of low performance and toxicity of the pavement base material.
Disclosure of Invention
The invention mainly aims to provide a pavement base material based on construction waste and a preparation method thereof, and aims to solve the technical problems of low performance and toxicity of the pavement base material.
In order to achieve the aim, the invention provides a pavement base material based on construction waste, which comprises a basic component and an external additive;
the base component comprises the following components in parts by weight: 30-40 parts of engineering slag soil, 25-35 parts of decoration waste, 10-15 parts of waste incineration fly ash, 2-5 parts of cement, 2-5 parts of slag and 15-20 parts of water; the total mass part of the basic components is 100 parts;
the external admixture comprises alkylphenol polyoxyethylene, sodium dodecyl sulfate and glycerol; the mass of the alkylphenol polyoxyethylene is 3-5% of the waste incineration fly ash; the mass of the sodium dodecyl sulfate is 1 to 3 percent of the waste incineration fly ash; the mass of the glycerol is 1 to 3 percent of the waste incineration fly ash.
Further, the total parts of the cement and the slag are 6 to 8 parts.
Further, the particle size of the engineering muck is not more than 4.75mm.
Further, the particle size of the decoration garbage is not more than 4.75mm.
Further, the waste incineration fly ash includes domestic waste incineration fly ash.
Further, the cement comprises composite portland cement; the slag includes granulated blast furnace slag.
The invention also provides a preparation method of the pavement base material, which comprises the following steps:
s1, mixing the waste incineration fly ash, the alkylphenol ethoxylates, the sodium dodecyl sulfate, the glycerol and part of the water together to obtain a first mixture;
s2, mixing the first mixture, the cement and the slag together to obtain a second mixture;
and S3, mixing the second mixture, the engineering muck, the decoration garbage and the residual water together to obtain the pavement base material.
Further, in the step S1, the ratio of the mass of part of the water to the total mass of the water is 1.
Further, the mixing in step S3 is performed under a vibrating condition.
Further, the mixing time in the step S1 is 30 to 40s, the mixing time in the step S2 is 15 to 20S, and the mixing time in the step S3 is 45 to 60s.
Compared with the prior art, the invention has at least the following advantages:
1. in the construction waste, the engineering residue soil is the largest in production amount, is difficult to be utilized with high added value and can only be used as a filler; the decoration garbage has the most complex components and is difficult to recycle. But the decoration garbage also contains a small amount of gypsum, lime, cement which is not completely hydrated and the like, and has a certain water hardening effect. In addition, the waste incineration fly ash is calcined at high temperature, has volcanic ash activity similar to the characteristics of materials such as fly ash and slag, and simultaneously contains a large amount of heavy metal elements, so that the phenomenon that the environment is polluted by leaching of heavy metal ions is avoided in the resource utilization process.
By adding alkylphenol ethoxylates, sodium dodecyl sulfate and glycerol, the mineral activity index in the waste incineration fly ash is increased; meanwhile, heavy metal ions are subjected to double decomposition precipitation and isomorphous replacement reaction in micropores of the solidified body in a high-alkali environment, and the leaching of heavy metals is effectively inhibited through the actions.
In addition, the cementing material combination of the waste incineration fly ash, the cement and the slag can fully generate hydration reaction in an alkaline environment to generate good cementing effect, the curing effect on engineering slag soil and decoration waste is better, the early-stage strength of the early-stage mixture can be ensured, the hydration can be continued, and the overall strength of the material structure is continuously improved.
2. The preparation method of the invention has simple operation, does not need heating, can be carried out under the condition of normal temperature and is convenient for popularization.
Firstly, the waste incineration fly ash is stirred with alkylphenol polyoxyethylene, sodium dodecyl sulfate and glycerin, so that the waste incineration fly ash is favorably and fully mixed with the alkylphenol polyoxyethylene and the like, the activity of the waste incineration fly ash is improved to the maximum, and the effective utilization rates of the alkylphenol polyoxyethylene, the sodium dodecyl sulfate and the glycerin are increased.
And secondly, stirring the waste incineration fly ash and alkylphenol ethoxylates and the like, and then stirring the mixture with cement and slag to fully mix the chemical components with the cementing material, so that the subsequent hydration reaction amount of the cementing material is increased, and the cementing strength of the subsequent cementing material is increased.
Moreover, the engineering slag soil, the decoration garbage and the cementing material which is uniformly mixed are stirred in a vibrating manner, so that the stirring efficiency of the mixture is improved, and the problem that the overall strength is influenced due to the nonuniform mixing of the engineering slag soil and the cementing material is solved.
3. The popularization and the application of the invention can greatly promote the high-valued utilization of municipal solid wastes such as waste incineration fly ash, engineering muck, decoration wastes and the like; meanwhile, the pressure of shortage of raw materials in road engineering construction can be effectively relieved, and a foundation is laid for sustainable development of the traffic industry.
In addition, the main raw materials of the invention have lower cost than natural stone and have better economic benefit. The main raw material of the invention is urban solid waste, which can greatly reduce the consumption of natural stone and cement, thereby reducing carbon emission in the road engineering construction process.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Moreover, the technical solutions in the embodiments of the present invention may be combined with each other, but it is necessary to be able to be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and are intended to be open ended, i.e., to include any methods, devices, and materials similar or equivalent to those described in the examples.
The invention provides a pavement base material based on construction waste, which has high resource utilization degree, and increases the recycling way and additional value of wastes; and the pavement base material has excellent mechanical property and durability, and is economic and environment-friendly.
The pavement base material specifically comprises a base component and an external additive.
As an illustration of the base components:
the base component comprises the following components in parts by mass: 30-40 parts of engineering slag soil, 25-35 parts of decoration waste, 10-15 parts of waste incineration fly ash, 2-5 parts of cement, 2-5 parts of slag and 15-20 parts of water; the total mass part of the basic component is 100 parts.
In order to further ensure the performance of the pavement base material and reduce the heavy metal leaching toxicity, the total parts of the cement and the slag can be 6 to 8.
The grain size of the engineering muck can be not more than 4.75mm. As will be appreciated by those skilled in the art, the engineering muck is a general engineering spoil, with a liquid limit of no more than 50%; before the engineering muck is used, the engineering muck can be dried in an environment of 105 +/-5 ℃ and then smashed into particles with the particle size of less than 4.75mm.
The decoration garbage can be decoration garbage fine aggregates, and the particle size of the decoration garbage fine aggregates is not more than 4.75mm. As will be known by those skilled in the art, the decoration garbage fine aggregate is particles with the particle size of less than 4.75mm, which are obtained by crushing decoration garbage after the decoration garbage is treated by a separation and sorting process (removing wood chips, scrap iron and plastics); the decoration garbage fine aggregate can be dried at 105 +/-5 ℃ before use.
The waste incineration fly ash can be household waste incineration fly ash, and those skilled in the art should know that the household waste incineration fly ash is bottom ash which is settled from the bottom of a flue gas purification system, a flue and a chimney after a household waste incineration plant incinerates waste.
The waste incineration fly ash is another waste involved in the present invention, and contains most heavy metals generated in incineration, for example: lead, cadmium, zinc and the like have great harm to the environment, belong to hazardous waste and need to be properly treated. In recent years, cement solidification, chemical solidification, heat treatment (melting and sintering), and the like have been mainly used as methods for treating waste incineration fly ash.
The principle of the cement solidification technology is that hydration products (with certain strength) generated by hydration reaction of cement are utilized to fix waste in the cement solidification technology, so that the waste is prevented from contacting with the environment, and harmless treatment of the waste is realized. However, after the waste incineration fly ash is solidified, the leaching concentration of heavy metals often cannot meet the requirements of related environmental protection standards, and the performance of the building material product containing the waste incineration fly ash is reduced, so that the project design requirements are difficult to meet. The compound system can well realize the treatment of the waste incineration fly ash, can improve the performance of the pavement base material and reduce the leaching toxicity.
The cement can be composite portland cement, and specifically can be PC42.5 composite portland cement. As will be appreciated by those skilled in the art, the PC42.5 composite portland cement has an initial setting time of greater than 180min and a final setting time of greater than 360min and less than 600min.
The slag may be granulated blast furnace slag. It will be appreciated by those skilled in the art that the granulated blast furnace slag has a specific surface area of more than 320m 2 Per kg, the activity index is more than 95 percent.
As an illustration of the admixture:
the external additive comprises alkylphenol polyoxyethylene, sodium dodecyl sulfate and glycerol.
The alkylphenol polyoxyethylene ether is light yellow liquid, and the mass of the alkylphenol polyoxyethylene ether is 3-5% of that of the waste incineration fly ash.
The sodium dodecyl sulfate is white powder, and the mass of the sodium dodecyl sulfate is 1-3% of that of the waste incineration fly ash.
The glycerol is a colorless transparent liquid, and the mass of the glycerol is 1 to 3 percent of that of the waste incineration fly ash.
The invention also provides a preparation method of the pavement base material according to any embodiment, which comprises the following steps:
s1, mixing the waste incineration fly ash, the alkylphenol ethoxylates, the sodium dodecyl sulfate, the glycerol and part of the water together to obtain a first mixture;
s2, mixing the first mixture, the cement and the slag together to obtain a second mixture;
and S3, mixing the second mixture, the engineering muck, the decoration garbage and the residual water together to obtain the pavement base material.
Specifically, in the step S1, the ratio of the mass of part of the water to the total mass of the water is 1. Namely: the amount of water used in step S1 is one half to two thirds of the total amount of water.
The mixing in step S3 is performed under vibrating conditions.
The mixing time in the step S1 is 30 to 40s, the mixing time in the step S2 is 15 to 20S, and the mixing time in the step S3 is 45 to 60s.
The preparation method of the pavement base material can be specifically understood as follows:
firstly, putting the waste incineration fly ash, the alkylphenol ethoxylates, the sodium dodecyl sulfate, the glycerol and 1/2 to 2/3 of the water in parts by weight into a vibration stirring pot, and normally stirring (without vibration) for 30 to 40s; then, putting the cement and the slag into the vibration stirring pot, and continuously and normally stirring (without vibration) for 15 to 20s; and finally, putting the engineering slag soil, the decoration garbage and the residual water in required parts into the vibration stirring pot, and vibrating and stirring for 45-60s to obtain the pavement base material.
Wherein the stirring power and the vibration power of the vibration stirring pot can be 4 to 4.5kW, and the vibration frequency can be 50 to 55Hz.
The present invention will be described in detail below with reference to specific examples and comparative examples:
in each of the examples of the present invention and the comparative examples, the same raw materials were used in the same batch; the used engineering muck and the used fine aggregates of the decoration garbage are particles which are not more than 4.75mm after being dried, crushed and sieved (passing through a 4.75mm sieve); the used waste incineration fly ash is household waste incineration fly ash; the used cement is PC42.5 composite portland cement; the slag used is granulated blast furnace slag.
The vibration stirrer (vibration stirring pot) used in the test piece forming process is double-horizontal-shaft vibration stirring equipment produced by the millennia bridge limited company in Henan, and the conventional stirrer (conventional stirring pot) is an SJD 30 type horizontal forced stirrer produced by the Shanghai Xiaoxiao Xiao Jie laboratory instruments limited company.
The test of sampling, forming, maintaining and the like of the raw materials of the test specimen refers to the relevant regulations of Highway engineering inorganic binder stable material test regulations (JTG E51-2009).
The test specimen performance test items comprise 7-day unconfined compressive strength, water stability test and specimen heavy metal leaching test.
The unconfined compressive strength of the test specimen is tested after the test specimen is maintained for 7 days under the standard maintenance condition, the water stability test mainly comprises the steps of maintaining the test specimen under the standard maintenance condition for 6 days, soaking the test specimen in water for one day, testing the unconfined compressive strength of the test specimen, and the ratio of the measured value to the 7-day strength value of the test specimen under the condition that the test specimen does not soak in water is the water stability coefficient. The strength test method of the test piece refers to the relevant regulation of Highway engineering inorganic binder stabilizing material test regulation (JTG E51-2009).
The test piece is cured under standard curing conditions for 28 days, taken out and dried at room temperature for 2 days. And crushing the dried test piece, grinding the test piece by using a ball mill, screening the test piece by using a square-hole sieve, and collecting particles with the particle size of 0.125mm to 0.25mm as a test sample to be tested. The test procedure of the heavy metal leaching amount of the sample refers to the relevant regulations of the determination method of leachable heavy metals in cement mortar (JTG E51-2009), and the tested heavy metals comprise Pb, zn and Cd.
Example 1
The base course material in this embodiment is composed of a base component and an external additive.
In the basic components, the mass ratio of each raw material is as follows: 35% of engineering slag soil, 30% of fine decoration garbage aggregates, 12% of domestic garbage incineration fly ash, 3% of cement, 4% of slag and 16% of water.
The external admixture is: 4% of alkylphenol polyoxyethylene ether relative to the mass of the household garbage incineration fly ash, 2% of sodium dodecyl sulfate relative to the mass of the household garbage incineration fly ash, and 2% of glycerin relative to the mass of the household garbage incineration fly ash.
The preparation method of the pavement base material in the embodiment comprises the following steps:
firstly, putting the required parts of the domestic garbage incineration fly ash, alkylphenol ethoxylates, sodium dodecyl sulfate, glycerol and part of water (accounting for 2/3 of the total water mass) into a vibration stirring pot for normal stirring (without vibration) for 35s;
then, cement and slag are put into the vibration stirring kettle, and ordinary stirring (without vibration) is continued for 20s;
and finally, putting the required parts of engineering muck, decoration garbage fine aggregate and residual water into the vibration stirring pot, and vibrating and stirring for 60 seconds to obtain the pavement base material.
In the preparation process of the embodiment, the stirring power and the vibration power of the vibration stirring pot are both 4kW, and the vibration frequency is 50Hz.
Example 2
The base course material in this embodiment is composed of a base component and an external additive.
In the basic components, the mass ratio of each raw material is as follows: 40 percent of engineering slag soil, 25 percent of fine aggregate of decoration garbage, 10 percent of fly ash from incineration of household garbage, 5 percent of cement, 2 percent of slag and 18 percent of water
The external admixture is: 4% of alkylphenol polyoxyethylene ether relative to the mass of the household garbage incineration fly ash, 2% of sodium dodecyl sulfate relative to the mass of the household garbage incineration fly ash, and 2% of glycerin relative to the mass of the household garbage incineration fly ash.
The preparation method of the road surface base material in this example is the same as that of example 1.
Example 3
The base course material in this embodiment is composed of a base component and an admixture.
The basic components comprise the following components in percentage by mass: 30% of engineering slag, 32% of decorative garbage fine aggregate, 15% of domestic garbage incineration fly ash, 3% of cement, 3% of slag and 17% of water.
The external admixture is: 5% alkylphenol ethoxylate relative to the mass of the fly ash from burning household garbage, 3% sodium lauryl sulfate relative to the mass of the fly ash from burning household garbage, and 3% glycerin relative to the mass of the fly ash from burning household garbage.
The preparation method of the road surface base material in this example was the same as that of example 1.
Example 4
The raw materials and the compounding ratio in the road base material in this example were the same as those in example 1.
The preparation method of the pavement base material in this embodiment is as follows:
firstly, putting the required parts of the domestic garbage incineration fly ash, alkylphenol ethoxylates, sodium dodecyl sulfate, glycerol and part of water (accounting for 1/2 of the total water mass) into a vibration stirring pot for ordinary stirring (without vibration) for 30s;
then, cement and slag are put into the vibration stirring kettle, and ordinary stirring (without vibration) is continued for 20s;
and finally, putting the required parts of engineering muck, decoration garbage fine aggregate and residual water into a vibration stirring pot, and vibrating and stirring for 45s to obtain the pavement base material.
In the preparation process of the embodiment, the stirring power and the vibration power of the vibration stirring pot are both 4kW, and the vibration frequency is 50Hz.
Comparative example 1
No admixture was added to this comparative example.
In the pavement base material of the comparative example, the mass ratio of the raw materials is as follows: 35% of engineering slag soil, 30% of fine decoration garbage aggregates, 12% of domestic garbage incineration fly ash, 3% of cement, 4% of slag and 16% of water.
The preparation method of the pavement base material in the comparative example comprises the following steps:
firstly, putting the required amount of the fly ash from the incineration of the household garbage and part of water (accounting for 2/3 of the total water mass) into a vibration stirring pot and stirring the fly ash and the part of water for 35s in a normal way (without vibration);
then, cement and slag are put into the vibration stirring kettle, and ordinary stirring (without vibration) is continued for 20s;
and finally, putting the required parts of engineering muck, decoration garbage fine aggregate and residual water into the vibration stirring pot, and vibrating and stirring for 60 seconds to obtain the pavement base material.
In the comparative example, the stirring power and the vibration power of the vibration stirring kettle were both 4kW, and the vibration frequency was 50Hz.
Comparative example 2
The comparative example did not add cement and slag.
The pavement base material in this comparative example consisted of a base component and an admixture.
In the basic components, the mass ratio of each raw material is as follows: 38 percent of engineering slag soil, 30 percent of fine aggregate of decoration garbage, 15 percent of fly ash from incineration of household garbage and 17 percent of water.
The external doping agent is: 4% of alkylphenol polyoxyethylene ether relative to the mass of the household garbage incineration fly ash, 2% of sodium dodecyl sulfate relative to the mass of the household garbage incineration fly ash, and 2% of glycerin relative to the mass of the household garbage incineration fly ash.
The preparation method of the pavement base material in the comparative example comprises the following steps:
firstly, putting the required parts of the domestic garbage incineration fly ash, alkylphenol ethoxylates, sodium dodecyl sulfate, glycerol and part of water (accounting for 2/3 of the total water mass) into a vibration stirring pot for ordinary stirring (without vibration) for 55s;
and then, putting the required parts of engineering muck, decoration garbage fine aggregate and residual water into a vibration stirring pot, and vibrating and stirring for 60 seconds to obtain the pavement base material.
In this comparative example, the stirring power and the vibration power of the vibration stirring kettle were both 4kW, and the vibration frequency was 50Hz.
Comparative example 3
This comparative example changed the stirring process in the preparation method.
The raw materials and the proportions of the materials in the road base material in this comparative example were the same as those in example 1.
The preparation method of the pavement base material in the comparative example comprises the following steps:
and (3) putting the required parts of the domestic waste incineration fly ash, the engineering slag soil, the decorative waste fine aggregate, the cement, the slag, the water, the alkylphenol ethoxylates, the sodium dodecyl sulfate and the glycerol into a conventional stirring pot, and stirring for 115 seconds to obtain the pavement base material.
In this comparative example, the stirring power of the conventional stirring pan was 4kW.
Analytical example 1
See table 1 for the following: the performance indexes in all aspects of examples 1 to 4 are superior to those of a comparative example; the strength of the embodiments 1 to 4 can meet the design index requirements of the road base of each grade, and the water stability performance is excellent.
In addition, the leaching concentrations of the heavy metals in the examples 1 to 4 all reach the relevant requirements of the pollution control Standard for municipal solid waste landfills (GB 16889-2008) (Pb < 0.25mg/L, zn < 100 mg/L and Cd < 0.15 mg/L).
From the comparison between example 1 and comparative example 1, it can be seen that the lack of alkylphenol ethoxylates, sodium lauryl sulfate and glycerin in the mixed material results in a decrease in strength and an increase in heavy metal leaching concentration, which cannot meet the requirements of the base material of pavement. Alkylphenol ethoxylates and the like have great effects on enhancing the activity of the fly ash generated by burning the domestic garbage and reducing the leaching of heavy metals.
As can be seen from the comparison of example 1 with comparative example 2, the cement and slag were absent, the strength of the mixed material was low, the binding effect to heavy metals was reduced, and therefore the leaching concentration of heavy metals was excessively high.
From the comparison of example 1 and comparative example 3, it can be seen that the properties of the mix are difficult to satisfy the pavement base material using the conventional mixing method. By adopting vibration stirring, the effective utilization rate of alkylphenol ethoxylates, sodium dodecyl sulfate and glycerol can be increased, the overall strength of the mixture is improved, and the inhibition effect of the mixture on heavy metal leaching is increased.
Table 1: results of comprehensive Property measurements
From the results, the pavement base material provided by the invention has better mechanical property and water stability, and the leaching concentration of heavy metals meets the environmental protection requirement. The raw materials of the invention are solid wastes such as domestic waste incineration fly ash, construction waste and the like, the cost is low, and a large amount of broken stone resources can be saved for the construction of traffic engineering in China. In addition, it should be noted that the environmental benefits of the present invention are far greater than the economic benefits.
In the above technical solutions, the above are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and all the technical solutions of the present invention that are directly or indirectly applied to other related technical fields and the equivalent structural changes made by the present specification are included in the scope of the present invention.
Claims (10)
1. The pavement base material based on the construction waste is characterized by comprising a base component and an external additive;
the base component comprises the following components in parts by mass: 30-40 parts of engineering slag soil, 25-35 parts of decoration garbage, 10-15 parts of garbage incineration fly ash, 2-5 parts of cement, 2-5 parts of slag and 15-20 parts of water; the total mass part of the basic components is 100 parts;
the external admixture comprises alkylphenol polyoxyethylene, sodium dodecyl sulfate and glycerol; the mass of the alkylphenol polyoxyethylene is 3-5% of the waste incineration fly ash; the mass of the sodium dodecyl sulfate is 1 to 3 percent of the waste incineration fly ash; the mass of the glycerol is 1 to 3 percent of the waste incineration fly ash.
2. The roadbed material of claim 1, wherein the total parts of the cement and the slag is 6 to 8 parts.
3. The pavement base material of claim 1, wherein the engineered soil residue has a particle size of no greater than 4.75mm.
4. The pavement base material of claim 1, wherein the finishing waste has a particle size of no greater than 4.75mm.
5. The pavement base material of claim 1, wherein the waste incineration fly ash comprises household waste incineration fly ash.
6. The pavement base material of claim 1, wherein the cement comprises a composite portland cement; the slag includes granulated blast furnace slag.
7. A method of producing a pavement base material according to any of claims 1 to 6, comprising the steps of:
s1, mixing the waste incineration fly ash, the alkylphenol ethoxylates, the sodium dodecyl sulfate, the glycerol and part of the water together to obtain a first mixture;
s2, mixing the first mixture, the cement and the slag together to obtain a second mixture;
and S3, mixing the second mixture, the engineering muck, the decoration garbage and the residual water together to obtain the pavement base material.
8. The preparation method according to claim 7, wherein in the step S1, the ratio of the mass of the water to the total mass of the water is 1.
9. The method according to claim 7, wherein the mixing in step S3 is performed under a vibrating condition.
10. The method for preparing a polyurethane foam according to any one of claims 7 to 9, wherein the mixing time in the step S1 is 30 to 40s, the mixing time in the step S2 is 15 to 20s, and the mixing time in the step S3 is 45 to 60s.
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| CN117049836A (en) * | 2023-10-11 | 2023-11-14 | 湖南云中再生科技股份有限公司 | Permeable construction waste pavement base material, preparation method and application |
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