CN112374836A - Cement stabilized macadam gel material and preparation method and application thereof - Google Patents
Cement stabilized macadam gel material and preparation method and application thereof Download PDFInfo
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- CN112374836A CN112374836A CN202011383336.2A CN202011383336A CN112374836A CN 112374836 A CN112374836 A CN 112374836A CN 202011383336 A CN202011383336 A CN 202011383336A CN 112374836 A CN112374836 A CN 112374836A
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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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- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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- Road Paving Structures (AREA)
Abstract
The invention provides a cement stabilized macadam gel material which comprises the following raw materials in parts by mass: 4-6 parts of cement, 4-6 parts of mineral powder, 60-75 parts of steel slag, 5-15 parts of stone chips and 20-30 parts of recycled coarse aggregate. The cement stabilized macadam gel material has the characteristics of quick hardening and early strength, overcomes the defects of low strength, easy shrinkage, more expansion cracks and the like of cement stabilized regenerated macadams through the ternary combination of the steel slag, the regenerated macadam and stone chips, realizes the advantage complementation and plays the roles of micro-expansion of steel slag aggregates and double reinforcement of potential water hardness activity; in addition, the connection time of base course and surface course construction can be effectively shortened, and the pavement construction efficiency and quality are improved.
Description
Technical Field
The invention belongs to the technical field of novel building materials, and particularly relates to a cement-stabilized macadam gel material, and a preparation method and application thereof.
Background
The cement stabilized macadam is made up by mixing sufficient cement and water in a graded macadam, compacting and curing the mixture and then making its strength meet the specified requirements. The cement stabilized macadam has good plate body property, and the water stability and the frost resistance of the cement stabilized macadam are better than those of lime stabilized soil, but the cement stabilized macadam can cause drying shrinkage cracks due to moisture change. The cement content of the cement stabilized macadam is generally 3% -6% of that of the mixture, the unconfined compressive strength of 7 days can reach 5.0Mpa, and the cement stabilized macadam is higher than other roadbed materials. After the cement stabilized macadam survives, the macadam does not get muddy when meeting rain, has a solid surface, and is an ideal base material for high-grade pavements.
At present, a common permeable pavement system is generally composed of a gravel cushion layer, a permeable concrete base layer and a permeable concrete surface layer, the supporting effect of a common or regenerated gravel cushion layer on the whole concrete permeable pavement and the connection effect of the gravel cushion layer and a roadbed in a traditional pavement structure are poor, the rigidity of the gravel cushion layer is insufficient, and the bearing capacity and the service life of the pavement are greatly influenced. The rapid-hardening cement-stabilized composite steel slag macadam is prepared by compounding the steel slag and the building reclaimed materials, can simultaneously absorb two large solid wastes of the steel slag and the building garbage, has high coagulation and solidification speed and high early strength, can be premixed with base layer concrete when a macadam cushion is paved, greatly shortens the construction period, reduces the material and labor cost, and has remarkable social and economic benefits.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a cement-stabilized macadam setting compound and a preparation method thereof, which are used for solving the problems of insufficient rigidity and low setting and curing speed of a macadam cushion layer in the prior art.
To achieve the above objects and other related objects, the present invention is achieved by the following technical solutions.
The invention provides a cement stabilized macadam gel material which comprises the following raw materials in parts by mass:
the dry material components except water in the raw materials are firstly mixed and then mixed and stirred with water, and the cement stabilized macadam gel material can be prepared.
The invention overcomes the defects of low strength, easy shrinkage, more expansion cracks and the like of the cement stabilized and regenerated coarse aggregate by ternary compounding of the steel slag, the regenerated coarse aggregate and the stone chips, realizes advantage complementation, fully exerts the micro-expansion and potential hydraulic activity double-reinforcement function of the steel slag, and finally obtains the cement stabilized macadam gel material which has the advantages of high strength, difficult shrinkage, quick hardening and low cost, can obviously shorten the connection time of base layer and surface layer construction, and improves the pavement construction efficiency and quality. Meanwhile, the invention consumes a large amount of industrial solid waste and urban building waste, and develops a new way for resource recycling.
Preferably, the cement can be 4-5 parts, 4.5-5.5 parts, and 5-6 parts; 4-5 parts of the mineral powder, 4.5-5.5 parts of the mineral powder and 5-6 parts of the mineral powder; the steel slag can be 60-70 parts, and can also be 65-75 parts; the stone chips can be 5-10 parts, 8-13 parts or 10-15 parts; the recycled coarse aggregate can be 20-25 parts, 23-28 parts or 25-30 parts.
Preferably, the mass ratio of the water to the dry materials is 1 (20-22). More preferably, the mass ratio of the water to the dry materials is 1 (21-22).
Preferably, the particle size of the steel slag is 0-15 mm; based on the total mass of the steel slag, the content of f-CaO (free calcium oxide) in the steel slag is less than 5 percent, and the content of MFe (metallic iron) is less than or equal to 2 percent. In the invention, the steel slag is finely ground converter steel slag powder, wherein the detection method of the contents of f-CaO and MFe is carried out by referring to YB/T140-2009 steel slag chemical analysis method.
More preferably, the mass of the steel slag with the particle size of 0-5 mm accounts for 30-50% of the total mass of the steel slag.
Preferably, the cement is selected from the group consisting of class 42.5 Portland cement.
Preferably, the density of the ore powder is more than or equal to 2.8g/cm3The specific surface area is more than or equal to 350m2The activity index of/kg, 28d is more than or equal to 95 percent. The method for measuring the specific surface area is carried out according to GB/T8074-2008 cement specific surface area measuring Lasiosphaera method; the detection method of the activity index is carried out by referring to GB/T18046-2000 granulated blast furnace slag powder used in cement and concrete.
Preferably, the particle size of the stone chips is 0-5 mm; the mud content of the stone chips is less than or equal to 3 percent and the mud block content is less than or equal to 1 percent based on the total mass of the stone chips. In the invention, the detection method of the mud content and the mud block content refers to GB/T14685-2011 construction pebbles and gravels.
Preferably, the particle size of the recycled coarse aggregate is 15-30 mm.
The invention also provides a preparation method of the cement stabilized macadam gel compound, which comprises the following steps:
and (3) putting the components in the dry material into a stirrer according to parts by mass, stirring, mixing, adding water and stirring uniformly.
Preferably, the dry materials are placed into a stirrer to be stirred for 8-12 minutes; the stirring time after the water is added is 8-12 minutes.
Preferably, the mixer is a general purpose concrete mixer.
The invention also provides application of the cement-stabilized macadam gel material in a road pavement base.
The cement stabilized macadam gel material has the characteristics of quick hardening and early strength, overcomes the defects of low strength, easy shrinkage, more expansion cracks and the like of cement stabilized regenerated macadams through the ternary combination of the steel slag, the regenerated macadam and stone chips, realizes the advantage complementation and plays the roles of micro-expansion of steel slag aggregates and double reinforcement of potential water hardness activity; in addition, the connection time of base course and surface course construction can be effectively shortened, and the pavement construction efficiency and quality are improved. Meanwhile, large amount of industrial solid waste and urban construction waste are consumed, resource utilization approaches are developed, and production cost is reduced.
Compared with the prior art, the invention has the beneficial effects that:
1) the cement-stabilized macadam setting adhesive material obtained by the invention has the characteristics of quick hardening and early strength, and can be used for premixing concrete for a base layer when a macadam cushion layer is paved, so that the construction efficiency can be obviously improved, the construction period can be shortened, and the cost can be saved;
2) after the steel slag and the recycled coarse aggregate are mixed, the steel slag with multi-edge angles, roughness and high strength on the surface and the recycled coarse aggregate are compounded through differentiated particle sizes in the stirring process, the ball effect is exerted, the mixing working performance is improved, the internal gap of a concrete framework is effectively filled, the early strength is high, the hardening speed is high, and the road construction efficiency is improved;
3) in the invention, after hydration of free calcium oxide in the steel slag, the regenerated coarse aggregate can be caused to slightly expand, so that the slow shrinkage of concrete can be resisted to a certain extent, the volume stability of the concrete is improved, the cracking problem of the concrete is relieved, and the service life of the cement-stabilized macadam gel material is prolonged;
4) the mineral powder can partially replace cement to be used as a cementing material, and the waste steel slag and the recycled coarse aggregate are used for preparing the pavement material, so that the cost can be saved by 15-25 yuan/square meter, the solid waste is eliminated, the production cost of the product is reduced, and the economic and social benefits are remarkable.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
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. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
In the application, the content of f-CaO in the steel slag is less than 5 percent and the content of MFe in the steel slag is less than or equal to 2 percent by taking the total mass of the steel slag as a reference, and the steel slag is specifically selected from Shanghai metallurgy environmental engineering science and technology limited company;
in the application, the silicate cement is 42.5-grade ordinary silicate cement, and is specifically selected from Taicang conch cement company Limited;
in the application, the particle size of the stone chips is 0-5 mm; the mud content in the stone chips is less than or equal to 3 percent and the mud block content is less than or equal to 1 percent by taking the total mass of the stone chips as a reference, and the stone chips are specifically selected from Shanghai Yusha practical Co Ltd;
in the application, the density of the mineral powder is more than or equal to 2.8g/cm3The specific surface area is more than or equal to 350m2The activity index of/kg and 28d is more than or equal to 95 percent, and is specifically selected from Baotian novel building materials Co.
Example 1
In the formula of the cement stabilized macadam gel material, the names and the parts by mass of the raw materials in the dry material are as follows:
in this example, the preparation method of the cement-stabilized macadam gel compound is as follows: putting the dry materials in parts by mass into a stirrer, and uniformly stirring for 9 minutes; then adding water, uniformly stirring for 8 minutes, then pouring the stirred cement-stabilized macadam gel material into a construction site, and starting spreading, leveling and rolling. The 3d compressive strength and the 7d unconfined compressive strength were measured separately.
Wherein the mass ratio of the water addition amount to the dry materials is 1: 22; the mass ratio of the grain size of the steel slag in the range of 0-5 mm is 30%, and the grain size of the recycled coarse aggregate is 20-25 mm. Specific data for 3d compressive strength and 7d unconfined compressive strength are shown in table 1.
Example 2
In the formula of the cement stabilized macadam gel material, the names and the parts by mass of the raw material components are as follows:
in this example, the preparation method of the cement-stabilized macadam gel compound is as follows: putting the dry materials in parts by mass into a stirrer, and uniformly stirring for 9 minutes; then adding water, uniformly stirring for 10 minutes, then pouring the stirred cement-stabilized macadam gel material into a construction site, and starting spreading, leveling and rolling. The 3d compressive strength and the 7d unconfined compressive strength were measured separately.
Wherein the mass percentage of the water addition amount to the dry materials is 1: 20; the mass ratio of the grain size of the steel slag in the range of 0-5 mm is 40%, and the grain size of the recycled coarse aggregate is 15-20 mm. Specific data for 3d compressive strength and 7d unconfined compressive strength are shown in table 1.
Example 3
In the formula of the cement stabilized macadam gel material, the names and the parts by mass of the raw material components are as follows:
in this example, the preparation method of the cement-stabilized macadam gel compound is as follows: putting the dry materials in parts by mass into a stirrer and uniformly stirring for 10 minutes; then adding water, uniformly stirring for 11 minutes, then pouring the stirred cement-stabilized macadam gel material into a construction site, and starting spreading, leveling and rolling. The 3d compressive strength and the 7d unconfined compressive strength were measured separately.
Wherein the mass percentage of the water addition amount to the dry materials is 1: 21; the mass of the steel slag with the grain diameter of 0-5 mm accounts for 50% of the total mass of the steel slag, and the grain diameter of the recycled coarse aggregate is 25-30 mm. Specific data for 3d compressive strength and 7d unconfined compressive strength are shown in table 1.
Example 4
In the formula of the cement stabilized macadam gel material, the names and the parts by mass of the raw material components are as follows:
in this example, the preparation method of the cement-stabilized macadam gel compound is as follows: putting the dry materials in parts by mass into a stirrer, and uniformly stirring for 12 minutes; then adding water, uniformly stirring for 12 minutes, then pouring the stirred cement-stabilized macadam gel material into a construction site, and starting spreading, leveling and rolling. The 3d compressive strength and the 7d unconfined compressive strength were measured separately.
Wherein the mass percentage of the water addition amount to the dry materials is 1: 22; the mass of the steel slag with the grain diameter of 0-5 mm accounts for 45% of the total mass of the steel slag, and the grain diameter of the recycled coarse aggregate is 15-25 mm. Specific data for 3d compressive strength and 7d unconfined compressive strength are shown in table 1.
Example 5
In the formula of the cement stabilized macadam gel material, the names and the parts by weight of the components are as follows:
in this example, the preparation method of the cement-stabilized macadam gel compound is as follows: putting the dry materials in parts by mass into a stirrer, and uniformly stirring for 12 minutes; then adding water, uniformly stirring for 9 minutes, then pouring the stirred cement-stabilized macadam gel material into a construction site, and starting spreading, leveling and rolling. The 3d compressive strength and the 7d unconfined compressive strength were measured separately.
Wherein the mass percentage of the water addition amount to the dry materials is 1: 20; the mass of the steel slag with the grain diameter of 0-5 mm accounts for 45% of the total mass of the steel slag, and the grain diameter of the recycled coarse aggregate is 15-25 mm. Specific data for 3d compressive strength and 7d unconfined compressive strength are shown in table 1.
Comparative example 1
In the formula of the cement stabilizing material, the names and the parts by mass of the components are as follows:
the rest of the procedure was the same as in example 4.
Comparative example 2
In the formula of the cement stabilizing material, the names and the parts by mass of the components are as follows:
the rest of the procedure was the same as in example 4.
Comparative example 3
In the formula of the cement stabilizing material, the names and the parts by mass of the components are as follows:
the rest of the procedure was the same as in example 4.
Comparative example 4
In the formula of the cement stabilizing material, the names and the parts by mass of the components are as follows:
the rest of the procedure was the same as in example 4.
Comparative example 5
In the formula of the cement stabilizing material, the names and the parts by mass of the components are as follows:
the rest of the procedure was the same as in example 4.
And 7d, the unconfined compressive strength is detected according to a strength test method in JTG F80/1-2004 highway engineering quality inspection and assessment standard first civil engineering and JTG/T F20-2015 highway pavement base course construction technology.
The detection of the 3d compressive strength refers to a concrete strength test evaluation method in GB/T50107-2010 concrete strength test evaluation Standard.
TABLE 13 d compressive Strength and 7d unconfined compressive Strength test results
As shown in Table 1, the compressive strength of the cement stabilized macadam gel materials of examples 1-5 on day 3 meets the technical index requirements of not less than 3.5MPa, has the characteristics of quick hardening and early strength, and can shorten the transitional construction time of a cement macadam cushion layer and a pavement base. The data for 7d unconfined compressive strength of examples 1-5 are all above the standard parameters and are comparable to, and even superior to, those of the current conventional hydrostabilized base materials. In addition, the pavement material prepared by the waste steel slag and the recycled coarse aggregate can save the cost by 15-25 yuan/square meter, reduces the production cost of the product while absorbing and eliminating solid wastes, and has remarkable economic and social benefits.
In conclusion, the cement stabilized macadam gel material and the preparation method thereof have the advantages that the material has good plate body property, high early strength and crack resistance, and high deformation resistance, and all performance indexes meet the requirements of relevant standards. The invention utilizes the waste steel slag, stone chips and recycled coarse aggregate, has the advantages of consuming the solid waste of the steel slag and urban construction waste, shortening the construction period and improving the construction quality, opens up a large-dosage waste slag utilization way through the ternary combination of the steel slag, the recycled broken stone and the stone chips, realizes the advantage complementation among different resources and exerts the synergistic effect.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The cement-stabilized macadam gel material is prepared from dry materials and water, and is characterized in that the dry materials comprise the following raw material components in parts by mass:
2. the cement-stabilized macadam gel composition according to claim 1, wherein the mass ratio of water to dry materials is 1 (20-22).
3. The cement-stabilized macadam gel composition according to claim 1, wherein the steel slag has a particle size of 0-15 mm; based on the total mass of the steel slag, the content of f-CaO in the steel slag is less than 5 percent, and the content of MFe is less than or equal to 2 percent.
4. The cement-stabilized macadam gel composition according to claim 3, wherein the mass of the steel slag with the particle size of 0-5 mm accounts for 30-50% of the total mass of the steel slag.
5. The cement-stabilized macadam gel composition according to claim 1, wherein the particle size of the recycled coarse aggregate is 15-30 mm;
and/or, the cement is selected from 42.5-grade ordinary portland cement.
6. The cement-stabilized macadam gel composition according to claim 1, wherein the particle size of the stone chips is 0 to 5 mm; the mud content in the stone chips is less than or equal to 3 percent and the mud block content is less than or equal to 1 percent based on the total mass of the stone chips.
7. The cement-stabilized macadam gel composition according to claim 1, wherein the mineral powder has a density of not less than 2.8g/cm3The specific surface area is more than or equal to 350m2The activity index of/kg, 28d is more than or equal to 95 percent.
8. The method for preparing a cement stabilized macadam gel composition according to any one of claims 1 to 7, comprising the steps of:
and (3) putting the components in the dry material into a stirrer according to parts by mass, stirring, mixing, adding water and stirring uniformly.
9. The preparation method of the cement-stabilized macadam gel compound according to claim 8, wherein the dry material is placed in a stirrer and stirred for 8-12 minutes; the stirring time after the water is added is 8-12 minutes.
10. Use of the cement stabilized macadam gel mass according to any one of claims 1 to 7 in the preparation of a road pavement base.
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Application publication date: 20210219 |
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| RJ01 | Rejection of invention patent application after publication |