CN111393108A - Environment-friendly cement-stabilized macadam and application thereof - Google Patents
Environment-friendly cement-stabilized macadam and application thereof Download PDFInfo
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- CN111393108A CN111393108A CN202010226843.9A CN202010226843A CN111393108A CN 111393108 A CN111393108 A CN 111393108A CN 202010226843 A CN202010226843 A CN 202010226843A CN 111393108 A CN111393108 A CN 111393108A
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- cement
- steel slag
- stabilized macadam
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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
- C04B28/04—Portland cements
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- 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
Abstract
The invention discloses an environment-friendly cement stabilized macadam and application thereof, and relates to the technical field of stones. The environment-friendly cement stabilized macadam comprises the following components in parts by weight: aggregate 100 parts, cement 4.0-5.5 parts and water 4.0-6.5 parts; the aggregate comprises the following components in percentage by weight: 20.8-31.2% of 1# material with the particle size of 20-30mm, 24-36% of 2# material with the particle size of 10-20mm, 12-18% of 3# material with the particle size of 5-10mm, 3-5% of 4# material with the particle size of 3-5mm and 20-30% of 5# material with the particle size of 0-3 mm; the No. 2 material and the No. 3 material are steel slag aggregates, and the No. 1 material, the No. 4 material and the No. 5 material are limestone aggregates. The environment-friendly cement stabilized macadam can be widely applied to road engineering materials, and has the advantages of high compressive strength, strong crack resistance and good stability of a pavement base.
Description
Technical Field
The invention relates to the technical field of stones, and particularly relates to an environment-friendly cement stabilized macadam and application thereof.
Background
At present, traffic construction faces unprecedented environmental protection pressure, high-quality stones are difficult to obtain, and related substitute products are required to be searched. The steel slag is a byproduct generated in the steel-making process and is one of the worst bulk solid wastes utilized by steel enterprises in China. At present, the annual production amount of steel slag in China is about 1 hundred million tons, the steel slag in China is accumulated and stockpiled by nearly 10 hundred million tons currently, and the comprehensive utilization rate is less than 30 percent. If the steel slag is applied to traffic construction, on one hand, the problem of obtaining stone can be solved, the environmental protection pressure of traffic construction is relieved, on the other hand, waste materials can be changed into valuables, waste materials are reasonably utilized, and the environment is further protected. At present, the steel slag in China is mainly used for self circulation inside steel enterprises, and is also used for highway subgrade and railway subgrade, and used as a cement raw material and the like. However, steel slag is less used in pavement structures above a water-stable base course.
Generally, as the most commonly used road engineering material, cement stabilized macadam is widely used in the construction of road base course and sub-base course. Compared with the flexible base material, the cement stabilized macadam has high strength, large bearing capacity, good water stability, scouring resistance and strong plate body property, can utilize local sandstone materials according to local conditions, and saves construction cost. However, conventional cement stabilized macadams also have certain disadvantages: because the rigid material has high brittleness and is sensitive to temperature and humidity changes, cracks are easily caused by temperature shrinkage and drying shrinkage and are reflected to the pavement, and the service performance of the pavement is greatly reduced.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The invention aims to provide environment-friendly cement-stabilized macadam, application of the environment-friendly cement-stabilized macadam in road engineering materials and a pavement base course.
The invention is realized by the following steps:
in a first aspect, an embodiment provides an environment-friendly cement-stabilized macadam, which comprises the following components in parts by weight: aggregate 100 parts, cement 4.0-5.5 parts and water 4.0-6.5 parts;
the aggregate comprises the following components in percentage by weight: 20.8-31.2% of 1# material with the particle size of 20-30mm, 24-36% of 2# material with the particle size of 10-20mm, 12-18% of 3# material with the particle size of 5-10mm, 3-5% of 4# material with the particle size of 3-5mm and 20-30% of 5# material with the particle size of 0-3 mm;
the No. 2 material and the No. 3 material are steel slag aggregates, and the No. 1 material, the No. 4 material and the No. 5 material are limestone aggregates.
In an alternative embodiment, the aggregate has a compositional grading after mixing the material # 1, the material # 2, the material # 3, the material # 4 and the material # 5 that satisfies:
100 percent passing screen size of 31.5mm, 94-98 percent passing screen size of 26.5mm, 76-80 percent passing screen size of 19.0mm, 42-46 percent passing screen size of 9.5mm, 28-32 percent passing screen size of 4.75mm, 18-22 percent passing screen size of 2.36mm, 8-12 percent passing screen size of 0.6mm, and 2-4 percent passing screen size of 0.075 mm.
In an optional embodiment, the steel slag aggregate is prepared by placing steel slag in a sealed container, adding cold water for primary digestion to separate slag and iron, and obtaining primary treated steel slag; and then carrying out secondary digestion on the primary treated steel slag in a way of naturally piling for more than 6 months to obtain the steel slag.
In an alternative embodiment, the steel slag is converter steel slag.
In an alternative embodiment, the pressure of hot steam in the sealed vessel is not less than 0.05kg/cm at the time of the primary digestion2。
In an alternative embodiment, the time for the second digestion is 6 to 12 months.
In an alternative embodiment, the steel slag aggregate has a free calcium oxide content of 0-4%.
In an alternative embodiment, the cement is a P · O42.5 set retarding cement;
preferably, the specific surface area of the cement is more than or equal to 300m2/kg；
Preferably, the initial setting time of the cement is more than or equal to 240min, and the final setting time of the cement is more than or equal to 360min and less than or equal to 600 min;
preferably, the stability of the cement is less than or equal to 5 mm;
preferably, the 3-day breaking strength of the cement is more than or equal to 3.5 MPa;
preferably, the 3-day compressive strength of the cement is more than or equal to 17.0 MPa.
In a second aspect, embodiments provide the use of an environmentally friendly cement stabilized macadam according to any one of the preceding embodiments in a road engineering material.
In a third aspect, embodiments provide a subgrade comprising the environmentally friendly cement stabilized macadam of any of the preceding embodiments.
The invention has the following beneficial effects: the application provides an environment-friendly cement stabilized macadam mixes according to specific ratio to the aggregate of different particle sizes, obtains the aggregate in this application, still inject 2# material and 3# material wherein simultaneously and be the slag aggregate, and 1# material, 4# material and 5# material are the limestone aggregate. Through mixing the aggregate of different particle sizes in this application for the aggregate after the mixture has more ideal particle size distribution and pore distribution, makes the compressive strength of this environmental protection type cement stabilized macadam high, and anti-cracking performance is strong simultaneously. The steel slag aggregate and the limestone aggregate are compounded, so that not only can industrial solid waste be utilized, but also the activity of the steel slag aggregate is utilized, the consumption of cement is reduced, and the performance of the environment-friendly cement stabilized macadam is improved. The environment-friendly cement stabilized macadam can be widely applied to road engineering materials, and has high compressive strength and strong crack resistance. The obtained pavement base has good stability.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The application provides an environment-friendly cement stabilized macadam, which comprises the following components in parts by weight: aggregate 100 parts, cement 4.0-5.5 parts and water 4.0-6.5 parts.
Wherein, the aggregate comprises the following components in percentage by weight: 20.8-31.2% of 1# material with the particle size of 20-30mm, 24-36% of 2# material with the particle size of 10-20mm, 12-18% of 3# material with the particle size of 5-10mm, 3-5% of 4# material with the particle size of 3-5mm and 20-30% of 5# material with the particle size of 0-3 mm; the No. 2 material and the No. 3 material are steel slag aggregates, and the No. 1 material, the No. 4 material and the No. 5 material are limestone aggregates.
In the application, through the research on the grading of the aggregate, steel slag and limestone are simultaneously selected as the aggregate, and the specific aggregate of the application is formed by selecting the aggregate with different particle sizes in each grade in a compounding manner, so that the influence of the shrinkage of the fine aggregate is favorably reduced, and the cracking resistance of the water-stabilized base layer is improved.
Preferably, the aggregate comprises the following components in percentage by weight: 23.4-28.6% of 1# material with the grain diameter of 20-30mm, 27-33% of 2# material with the grain diameter of 10-20mm, 13.5-16.5% of 3# material with the grain diameter of 5-10mm, 3.6-4.4% of 4# material with the grain diameter of 3-5mm and 22.5-27.5% of 5# material with the grain diameter of 0-3 mm.
More preferably, the aggregate comprises the following components in percentage by weight: 26% of 1# material with the particle size of 20-30mm, 30% of 2# material with the particle size of 10-20mm, 15% of 3# material with the particle size of 5-10mm, 4% of 4# material with the particle size of 3-5mm and 25% of 5# material with the particle size of 0-3 mm.
Specifically, the steel slag aggregate is prepared by placing steel slag in a sealed container, adding cold water for primary digestion to separate slag and iron, and obtaining primary treated steel slag; and then carrying out secondary digestion on the primary treated steel slag in a natural stacking mode to obtain the steel slag.
Wherein the steel slag is converter steel slag, and the hot steam pressure in the sealed container is not less than 0.05kg/cm2The time for secondary digestion is 6-12 months. According to the method, cold water is added to carry out hot smoldering on the steel slag so as to carry out digestion once to separate the slag and iron. Because the steel slag contains a large amount of free calcium oxide, when cold water is added, the cold water is contacted with the hot steel slag due to the residual heat of the steel slag after the steel making is finished, and the pressure of 0.05kg/cm can be generated in a closed container2The hot steam contains in the steel slagThe volume of free calcium oxide (f-CaO) with a large amount is increased by 23-87%, and the active content of CaO is initially reduced. Then naturally digesting for 6-12 months to further increase the active content of CaO. After the two steps of treatment, the expansibility of the steel slag can meet the requirement that the water-soaking expansion rate of the steel slag for road building is not more than 2.0 percent in the technical specification of construction of the pavement base layer of the steel slag mixture (YB/T4184-2009).
In the prior art, the main reason why the steel slag is less applied to the pavement structure above the water-stable base layer is that the steel slag contains more free calcium oxide (f-CaO), and the content of the newly produced steel slag can reach more than 10 percent. The free calcium oxide is easy to hydrate when meeting water, and the volume of the free calcium oxide is expanded by about 2 times in the process, so that a matrix material is cracked, and the application of the steel slag in a base layer is restricted. In the application, the steel slag is treated by the treatment mode, and the content of free calcium oxide in the applicable steel slag aggregate is 0-4%, so the steel slag can be widely applied to the pavement base course.
Because the content of free calcium oxide in the steel slag aggregate is reduced through the treatment mode, and the steel slag aggregate has micro-expansibility, and can generate shrinkage compensation when being used as a base material, thereby avoiding the generation of cracks.
In this application, when carrying out the gradation to gathering materials, not only need ensure the particle size of the aggregate of each grade, still need the gradation requirement of the aggregate that forms after the control is mixed simultaneously.
Specifically, the synthetic grading of the aggregate after mixing the material No. 1, the material No. 2, the material No. 3, the material No. 4 and the material No. 5 meets the following requirements:
100 percent passing screen size of 31.5mm, 94-98 percent passing screen size of 26.5mm, 76-80 percent passing screen size of 19.0mm, 42-46 percent passing screen size of 9.5mm, 28-32 percent passing screen size of 4.75mm, 18-22 percent passing screen size of 2.36mm, 8-12 percent passing screen size of 0.6mm, and 2-4 percent passing screen size of 0.075mm
The specific calculation method comprises the following steps:
screening the aggregates of different grades (1# material, 2# material, 3# material, 4# material and 5# material) respectively to obtain screening results of the aggregates of different grades passing through sieve pores with different grain diameters, and further determining the grain diameter range percentage of the aggregates of different grades.
In the present application, for example, the screen holes with sizes of 31.5mm, 26.5mm, 19.0mm, 9.5mm, 4.75mm, 2.36mm, 0.6mm and 0.075mm are used for screening the material No. 1, 2, 3, 4 and 5 respectively, and the screening results are as follows:
then, the grading proportion corresponding to each sieve pore range in the synthetic material is respectively calculated according to the aggregate percentage of each grade in the application, and the grading proportion should meet the following table:
in addition, in the present application, the coarse aggregates (1# material, 2# material, 3# material and 4# material) also need to satisfy the following technical requirements:
in the present application, the fine aggregate (5# material) also needs to meet the following technical requirements:
| test items | Technical requirements |
| Content of particles of < 0.075mm (%) | ≤15 |
| Sand equivalent (%) | ≥50 |
| Organic matter content (%) | ＜2 |
| Sulfate content (%) | ≤0.25 |
| Plasticity index (part below 0.075 mm) | ≤17 |
The cement in the application is P.O 42.5 delayed coagulation cement; specifically, the cement needs to meet the following criteria: the specific surface area of the cement is more than or equal to 300m2Per kg; the initial setting time of the cement is more than or equal to 240min, and the final setting time of the cement is more than or equal to 360min and less than or equal to 600 min; the stability of the cement is less than or equal to 5 mm; the 3-day breaking strength of the cement is more than or equal to 3.5 MPa; the 3-day compressive strength of the cement is more than or equal to 17.0 MPa.
The water in this application is generally potable water.
In addition, in the present application, with reference to a compaction test method of inorganic binder stabilized soil in "test specification for inorganic binder stabilized soil for road engineering" (JTG E51-2009), cement was subjected to: the aggregate is 3.5: 100; 4.0: 100; 4.5: 100; the environmental-friendly cement stabilized macadam compaction test is carried out according to five mixing ratios of 5.0:100 and 5.5:100, respective compaction curves are drawn, so that the optimal water content and the maximum dry density are determined, and the test results are as follows.
According to the unconfined compressive strength test method of the inorganic binder stabilized soil, for cement stabilized steel slag crushed stones and common water stabilized crushed stones with different cement dosages, the maximum dry density and the optimal water content are obtained according to compaction tests, test pieces with the diameter of × being phi 150mm × 150mm are prepared by a static compaction method, the test pieces are maintained at constant temperature (20 +/-2 ℃) for 6 days in a standard maintenance box, after being soaked for 1d, the test pieces are found to be intact and have no fracture and no crack in the maintenance and soaking processes, the test pieces are tested on a pavement material strength tester, the loading deformation speed is 1mm/min, the 7d unconfined compressive strength of each test piece is measured, and the specific test results are as follows.
| Cement dosage (%) | Unconfined compressive strength (MPa) | Standard deviation S (%) | Coefficient of variation CV(％) |
| 3.5 | 3.7 | 1.37 | 2.75 |
| 4.0 | 4.0 | 0.93 | 3.28 |
| 4.5 | 4.3 | 0.55 | 3.91 |
| 5.0 | 4.8 | 2.56 | 5.19 |
| 5.5 | 5.5 | 2.91 | 4.67 |
It can be seen from the above table that when the cement dosage is 4.0% -5.5%, the unconfined compressive strength of the environmentally-friendly cement stabilized macadam 7d is greater than 4.0MPa, and the design requirement can be met (the design value is 4.0-6.0 MPa).
According to the application, the weight percentage of the aggregates at all levels is limited, and meanwhile, the gradation of the finally synthesized synthetic material is limited.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides an environment-friendly cement stabilized macadam, which comprises the following components in parts by weight: 100 parts of aggregate, 5.5 parts of cement and 6.4 parts of water;
wherein, the aggregate comprises the following components in percentage by weight: 26% of No. 1 material, 30% of No. 2 material, 15% of No. 3 material, 4% of No. 4 material and 25% of No. 5 material; the No. 2 material and the No. 3 material are steel slag aggregates, and the No. 1 material, the No. 4 material and the No. 5 material are limestone aggregates.
Wherein the steel slag aggregate is prepared by placing converter steel slag in a sealed container, adding cold water for primary digestion, wherein the pressure of hot steam in the sealed container is not less than 0.05kg/cm2Separating slag and iron to obtain primary treated steel slag; and then carrying out secondary digestion on the primary treated steel slag in a way of naturally piling for more than 6 months to obtain the steel slag. The content of free calcium oxide in the steel slag aggregate in the embodiment is 2.67%.
The synthetic grading of the aggregate after being mixed by the 1# material, the 2# material, the 3# material, the 4# material and the 5# material meets the following table:
comparative example 1
Comparative example 1 is essentially the same as example 1 except that the aggregate composition is different and the compositional grading after mixing is different:
specifically, the aggregate comprises the following components in percentage by weight: 32% of No. 1 material, 31% of No. 2 material, 9% of No. 3 material, 4% of No. 4 material and 24% of No. 5 material.
The synthetic grading of the aggregate after being mixed by the 1# material, the 2# material, the 3# material, the 4# material and the 5# material meets the following table:
the environmentally friendly cement stabilized macadam obtained in example 1 and comparative example 1 was subjected to 7d unconfined compressive strength test:
according to the unconfined compressive strength test method of the inorganic binder stabilized soil, the maximum dry density and the optimal water content of cement stabilized steel slag crushed stones and common water stabilized crushed stones with different cement dosages are obtained according to compaction tests. Is prepared by static compaction method
The test piece is maintained for 6 days at constant temperature (20 +/-2 ℃) in a standard curing box under constant humidity, and after the test piece is soaked for 1 day, the test piece is found to be intact and has no fracture and no crack in the curing and soaking processes. The test is carried out on a pavement material strength tester, the loading deformation speed is 1mm/min, the 7d unconfined compressive strength of each test piece is measured, meanwhile, the anti-cracking performance (the average crack spacing of the base layer) is tested, and the specific test results are shown in the following table.
The application and tracking observation by combining with the entity engineering show that the average crack spacing of the environment-friendly anti-cracking type water stable base layer is 338.6m, the average crack spacing of the common water stable base layer at the same road section is 31.3m, the anti-cracking performance of the environment-friendly anti-cracking type water stable base layer is about 10 times that of the common water stable base layer, and the environment-friendly anti-cracking type water stable base layer has an obvious anti-cracking effect.
To sum up, the environmental protection type cement stabilization rubble that this application provided mixes according to specific ratio to the aggregate of different particle sizes, obtains the aggregate in this application, still inject 2# material and 3# material wherein simultaneously and be the slag aggregate, 1# material, 4# material and 5# material are the limestone aggregate. Through mixing the aggregate of different particle sizes in this application for the aggregate after the mixture has more ideal particle size distribution and pore distribution, makes the compressive strength of this environmental protection type cement stabilized macadam high, and anti-cracking performance is strong simultaneously. The steel slag aggregate and the limestone aggregate are compounded, so that not only can industrial solid waste be utilized, but also the activity of the steel slag aggregate is utilized, the consumption of cement is reduced, and the performance of the environment-friendly cement stabilized macadam is improved. The environment-friendly cement stabilized macadam can be widely applied to road engineering materials, and has high compressive strength and strong crack resistance. The obtained pavement base has good stability.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The environment-friendly cement-stabilized macadam is characterized by comprising the following components in parts by weight: aggregate 100 parts, cement 4.0-5.5 parts and water 4.0-6.5 parts;
the aggregate comprises the following components in percentage by weight: 20.8-31.2% of 1# material with the particle size of 20-30mm, 24-36% of 2# material with the particle size of 10-20mm, 12-18% of 3# material with the particle size of 5-10mm, 3-5% of 4# material with the particle size of 3-5mm and 20-30% of 5# material with the particle size of 0-3 mm;
the No. 2 material and the No. 3 material are steel slag aggregates, and the No. 1 material, the No. 4 material and the No. 5 material are limestone aggregates.
2. The environmentally friendly cement-stabilized macadam of claim 1, wherein the aggregate has a compositional grading, after mixing with the material # 1, the material # 2, the material # 3, the material # 4 and the material # 5, that satisfies:
100 percent passing screen size of 31.5mm, 94-98 percent passing screen size of 26.5mm, 76-80 percent passing screen size of 19.0mm, 42-46 percent passing screen size of 9.5mm, 28-32 percent passing screen size of 4.75mm, 18-22 percent passing screen size of 2.36mm, 8-12 percent passing screen size of 0.6mm, and 2-4 percent passing screen size of 0.075 mm.
3. The environment-friendly cement stabilized macadam of claim 1, wherein the steel slag aggregate is a once-treated steel slag obtained by placing steel slag in a sealed container, adding cold water to perform a digestion for one time to separate slag and iron; and then carrying out secondary digestion on the primary treated steel slag in a way of naturally piling for more than 6 months to obtain the steel slag.
4. The environmentally friendly cement stabilized macadam of claim 3, wherein the steel slag is converter steel slag.
5. The environmentally friendly cement-stabilized macadam according to claim 3, wherein, in the primary digestion, a hot vapor pressure in the sealed vessel is not less than 0.05kg/cm2。
6. The environmentally friendly cement stabilized macadam of claim 3, wherein the time for the secondary digestion is 6-12 months.
7. The environmentally friendly cement stabilized macadam of claim 3, wherein the steel slag aggregate has a free calcium oxide content of 0-4%.
8. The environmentally friendly cement-stabilized macadam of claim 1, wherein the cement is a P-O42.5 set retarding cement;
preferably, the specific surface area of the cement is more than or equal to 300m2/kg；
Preferably, the initial setting time of the cement is more than or equal to 240min, and the final setting time of the cement is more than or equal to 360min and less than or equal to 600 min;
preferably, the stability of the cement is less than or equal to 5 mm;
preferably, the 3-day breaking strength of the cement is more than or equal to 3.5 MPa;
preferably, the 3-day compressive strength of the cement is more than or equal to 17.0 MPa.
9. Use of the environmentally friendly cement stabilized macadam according to any one of claims 1 to 8 in road engineering materials.
10. A road base comprising the environmentally friendly cement-stabilized macadam of any one of claims 1-8.
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Cited By (4)
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| CN113860802A (en) * | 2021-07-20 | 2021-12-31 | 江苏东交智控科技集团股份有限公司 | Environment-friendly high-performance mineral admixture and preparation method and application thereof |
| CN114409333A (en) * | 2022-01-12 | 2022-04-29 | 东南大学 | Steel fiber lightweight aggregate cement stabilized macadam and preparation process thereof |
| CN114560668A (en) * | 2022-03-28 | 2022-05-31 | 中煤邯郸设计工程有限责任公司 | Coal gangue and steel slag mixture for pavement base and preparation method thereof |
| CN114751695A (en) * | 2022-04-13 | 2022-07-15 | 山东高速集团有限公司创新研究院 | Cement stabilized macadam based on waste glass cullet fine aggregate and preparation process thereof |
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| CN114409333A (en) * | 2022-01-12 | 2022-04-29 | 东南大学 | Steel fiber lightweight aggregate cement stabilized macadam and preparation process thereof |
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