CN117886532A - Magnesite waste rock and magnesite tailing semi-rigid pavement base material and preparation method and application thereof - Google Patents
Magnesite waste rock and magnesite tailing semi-rigid pavement base material and preparation method and application thereof Download PDFInfo
- Publication number
- CN117886532A CN117886532A CN202410062858.4A CN202410062858A CN117886532A CN 117886532 A CN117886532 A CN 117886532A CN 202410062858 A CN202410062858 A CN 202410062858A CN 117886532 A CN117886532 A CN 117886532A
- Authority
- CN
- China
- Prior art keywords
- magnesite
- waste rock
- tailings
- base material
- pavement base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000001095 magnesium carbonate Substances 0.000 title claims abstract description 173
- 235000014380 magnesium carbonate Nutrition 0.000 title claims abstract description 173
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 title claims abstract description 173
- 229910000021 magnesium carbonate Inorganic materials 0.000 title claims abstract description 173
- 239000000463 material Substances 0.000 title claims abstract description 72
- 239000010878 waste rock Substances 0.000 title claims abstract description 61
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 238000013461 design Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 55
- 239000004568 cement Substances 0.000 claims description 51
- 239000000203 mixture Substances 0.000 claims description 42
- 239000002245 particle Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 5
- 230000008595 infiltration Effects 0.000 claims description 2
- 238000001764 infiltration Methods 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 8
- 239000002910 solid waste Substances 0.000 abstract description 7
- 238000005065 mining Methods 0.000 abstract description 5
- 238000009991 scouring Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 41
- 238000005056 compaction Methods 0.000 description 31
- 239000002699 waste material Substances 0.000 description 25
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 22
- 239000004575 stone Substances 0.000 description 19
- 230000000694 effects Effects 0.000 description 12
- 239000000395 magnesium oxide Substances 0.000 description 12
- 238000010276 construction Methods 0.000 description 11
- 239000011230 binding agent Substances 0.000 description 9
- 238000011010 flushing procedure Methods 0.000 description 8
- 238000001354 calcination Methods 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 238000010257 thawing Methods 0.000 description 6
- 238000007710 freezing Methods 0.000 description 5
- 230000008014 freezing Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 229910052839 forsterite Inorganic materials 0.000 description 4
- 238000005461 lubrication Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004566 building material Substances 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 3
- 239000000347 magnesium hydroxide Substances 0.000 description 3
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 229910020068 MgAl Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 241000276425 Xiphophorus maculatus Species 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 239000008239 natural water Substances 0.000 description 2
- 230000008707 rearrangement Effects 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 239000003516 soil conditioner Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- MVXMNHYVCLMLDD-UHFFFAOYSA-N 4-methoxynaphthalene-1-carbaldehyde Chemical compound C1=CC=C2C(OC)=CC=C(C=O)C2=C1 MVXMNHYVCLMLDD-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 244000273928 Zingiber officinale Species 0.000 description 1
- 235000006886 Zingiber officinale Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- MYFXBBAEXORJNB-UHFFFAOYSA-N calcium cyanamide Chemical compound [Ca+2].[N-]=C=[N-] MYFXBBAEXORJNB-UHFFFAOYSA-N 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 238000005008 domestic process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 235000008397 ginger Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000000391 magnesium silicate Substances 0.000 description 1
- 229910052919 magnesium silicate Inorganic materials 0.000 description 1
- 235000019792 magnesium silicate Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Road Paving Structures (AREA)
Abstract
The invention discloses a magnesite waste rock and magnesite tailing semi-rigid pavement base material and a preparation method and application thereof, and belongs to the technical field of solid waste recycling and inorganic combination stabilizing materials. The magnesite waste rock and magnesite tailings with the grading design are used as aggregates of pavement base materials, and the grain size ranges of the magnesite waste rock and the magnesite tailings are 10-20mm, 5-10mm and 0-5mm. The pavement base material prepared by taking the continuous graded magnesite mining and stripping waste rock and magnesite tailings as aggregates has good frost resistance and strong anti-scouring capability, and can meet the requirements of the compressive strength of the secondary and below road base after being cured for 7 days.
Description
Technical Field
The invention belongs to the technical field of solid waste recycling and inorganic combination stable materials, and particularly relates to a magnesite waste rock and magnesite tailing semi-rigid pavement base material, a preparation method and application thereof.
Background
Magnesite is one of the dominant mineral resources, and the solid waste discharge is increased along with the vigorous development of the magnesite industry. The magnesite waste stone and tailings are piled up in a large quantity, so that not only a large quantity of land resources and space are occupied, but also great influence is brought to the production and living of human beings and the ecological environment.
At present, the domestic method for comprehensively utilizing the magnesite waste rock and the tailings comprises the following technical steps:
liu Yongjie et al discuss the preparation of magnesium silicate cement using magnesite tailings. The results show that: the method comprises the steps of adding slaked lime into flotation magnesite tailings to enable the C/S of a batching point to be between 2 and 3, enabling the M/S ratio of raw materials to be between 2.1 and 2.56, enabling the components to fall in an MgO-C2S-C3S area, enabling the sintering temperature to be 1450 ℃, and preparing the silicate cement taking magnesium oxide as a main crystal phase.
Yang Lichi et al prepared a mixture of light burned MgO and MgSO 4 by immersing magnesite tailings in a roasting and regenerating acid, respectively, and prepared magnesia sulfate cement by using the mixture of light burned MgO and MgSO 4.
Ginger manor et al made hollow blocks and masonry with magnesite tailing materials and tested the mechanical properties and thermal insulation properties. The test shows that the average compressive strength values of the two groups of compressive test pieces are 3.81MPa and 4.71MPa respectively; the average shear strength values of the shear test pieces are respectively 0.16MPa and 0.23MPa; the heat conductivity coefficient of the magnesite tailing hollow block masonry is 0.103W/(m.K), and meets the standard.
Liu Ziyuan et al prepared MgO expanding agent from magnesite tailings at different roasting temperatures, and analyzed the influence of roasting temperature on the mineral composition, grain size and activity of MgO expanding agent.
Zhou Ping et al prepared MgO-MgAl 2O4-Mg2SiO4 samples from magnesite tailings and secondary aluminum ash and studied the effect of calcination temperature on their performance. The results show that: when the temperature is kept for 3 hours at 1200-1500 ℃ when the ratio of m (magnesite tailings) to m (secondary aluminum ash) =7:3, mgO-MgAl 2O4-Mg2SiO4 complex phase material containing a small amount of impurity phase (calcium forsterite) can be prepared.
Du Gaoxiang et al studied the process technology of preparing platy nano-sized magnesium hydroxide by using magnesite tailings. The platy nanoscale magnesium hydroxide product is successfully prepared through calcining magnesite, reacting magnesium oxide with sulfuric acid, and preparing and characterizing the nano magnesium hydroxide powder.
Huang Mingxi et al, through research on preparing active MgO by calcining magnesite tailings, found that the magnesite tailings are completely decomposed when the calcining temperature is 1050 ℃ and the heat preservation time is 60min, and the MgO activity is optimal; the higher the calcination temperature, the longer the holding time, and the worse the MgO activity; the smaller the fineness of MgO particles, the higher the activity. Provides a feasible calcination process for preparing the magnesium expanding agent from magnesite tailings.
Jiang Yong et al invent a magnesite tailing soil conditioner, mainly solving the problems of acidification and salinization of facility vegetable field soil. The soil conditioner comprises 90-95% of magnesite tailing powder, 2-5% of lime nitrogen (calcium cyanamide) and 2-5% of zeolite powder.
The approach of comprehensively utilizing the magnesite waste rock and the tailings is found through analysis and research, and the method is mainly concentrated in the fields of building materials, refractory materials and the like, and mainly relates to the preparation of building materials (cement and wall materials, cement mortar, concrete aggregate and expanding agent) and novel building materials (microcrystalline glass). The magnesite tailings are generally applied to the preparation of refractory products such as magnesia, forsterite, slag splashing furnace protection modifier and the like in the field of refractory materials. However, the existing comprehensive utilization mode is technically complex and has small consumption of waste magnesite and tailings.
Highway engineering is linear engineering with ultra-long distance, and the demand for natural sand and stone materials is extremely high. The pavement base material of each production 1m 3 consumes about 2t of natural soil and stones, and the natural soil and stones can damage mountain vegetation in the process of mining production, thereby having adverse effect on surrounding environment. The extremely large soil and stone demand quantity leads the predation exploitation of a quarry, the exhaustion of crushed stone resources is difficult, and meanwhile, the transportation cost of crushed stone materials is high, so that the construction cost of a highway is increased intangibly.
In order to solve the problems, a preparation method and an application method of an industrial solid waste-based magnesite waste rock and magnesite tailing pavement base material with simple technology, large consumption and high economic benefit are needed to be developed.
Disclosure of Invention
In order to realize rapid and massive resource utilization of the waste magnesite and the tailings, relieve the demand of natural sand and stone materials in road construction and reduce the road construction cost, the invention provides a semi-rigid pavement base material of the waste magnesite and the tailings as well as a preparation method and application thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The semi-rigid pavement base material is prepared from waste magnesite and magnesite tailings by completely replacing traditional sand aggregates as aggregates of the pavement base material, wherein the grain size ranges of the waste magnesite and the magnesite tailings are 10-20mm, 5-10mm and 0-5mm. The reason of design grading is to ensure that coarse aggregates in the mixture can provide support, fine aggregates can fill gaps among coarse particles, and the compactness of the material is increased, so that better working performance is obtained.
Further, the mass ratio of the magnesite waste rock to the magnesite tailings with the particle size ranges of 10-20mm, 5-10mm and 0-5mm is 1:0 (0.4-0.6) to 0:0.7-0.9, and is preferably 1:0.5:0.8. The grain size distribution data of each grade of aggregate is obtained through screening test, grading design is carried out by adopting a numerical method-planning solution method, and the nominal maximum grain size and the content of the stabilized material are controlled so as to ensure better construction workability of the mixture.
Further, the raw materials of the magnesite waste rock and magnesite tailing semi-rigid pavement base material comprise magnesite waste rock and magnesite tailing, cement and water; the mixing amount of the cement is 3-7% of the total mass of the magnesite waste rock and the magnesite tailings, such as 3%, 4%, 5%, 6% and 7%; the water content is 5-7% of the total mass of the waste magnesite stone, the magnesite tailings and the cement, preferably 5.91-6.06%, such as 5.98%, 6.06%, 5.93%, 5.91% and 5.97%.
Under the compaction effect, the aggregate particles overcome capillary pressure or combined water shearing resistance to generate relative displacement rearrangement distribution. When the mixture of the magnesite waste rock and the magnesite tailing is in the optimal water content, a water film wrapped on the surfaces of aggregate particles plays a role in lubrication, the frictional resistance among particles is minimum, and the density of the mixture is maximum under a certain unit compaction work. Therefore, the invention adopts an indoor compaction test to simulate the compaction process of the cement stabilizing material on the construction site. And obtaining the optimal water content corresponding to the mixture with different cement dosages according to a dry density-water content relation curve drawn by the compaction test result. And the dosage of the inorganic binder cement is proportional to the strength of the mixture and inversely proportional to the cost of the mixture. And taking the lowest dosage of the inorganic binder under the condition that the strength meets the requirement.
Further, the apparent relative density of the magnesite waste rock and the magnesite tailings is 2.907-2.937g/cm 3, the crushing value is less than or equal to 30%, and the content of the needle-like particles is less than or equal to 20%.
The invention also provides a preparation method of the magnesite waste rock and magnesite tailing semi-rigid pavement base material, which comprises the following steps: weighing raw materials according to mass, mixing magnesite waste rock and magnesite tailings with the particle size of 10-20mm, magnesite waste rock and magnesite tailings with the particle size of 5-10mm, and magnesite waste rock and magnesite tailings with the particle size of 0-5mm, and carrying out infiltration treatment under a closed condition after uniformly stirring; mixing the soaked mixture, cement and the rest water, uniformly stirring, paving, compacting and maintaining to obtain the magnesite waste rock and magnesite tailing semi-rigid pavement base material.
The invention also provides application of the magnesite waste rock and magnesite tailing semi-rigid pavement base material in pavement materials.
The principle of the invention is as follows: after the mixture of the magnesite mining and stripping waste stone and the magnesite tailings is subjected to grading design, the mixture completely replaces the traditional sand and stone aggregate, and is used for a road pavement base after cement is utilized for stabilization.
Compared with the prior art, the invention has the following advantages and technical effects:
The pavement base material prepared by taking the continuous graded magnesite mining and stripping waste rock and magnesite tailings as aggregates has good frost resistance and strong anti-scouring capability, and can meet the requirements of the compressive strength of the secondary and below road base after being cured for 7 days.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a graph showing the effect of varying amounts of cement on unconfined compressive strength;
FIG. 2 shows the results of cement stabilized magnesite waste rock and tailings compaction, where (a) 3% cement; (b) 4% cement; (c) 5% cement; (d) 6% cement; (e) 7% cement.
Detailed Description
Various exemplary embodiments of the invention will now be described in detail, which should not be considered as limiting the invention, but rather as more detailed descriptions of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In addition, for numerical ranges in this disclosure, it is understood that each intermediate value between the upper and lower limits of the ranges is also specifically disclosed. Every smaller range between any stated value or stated range, and any other stated value or intermediate value within the stated range, is also encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless otherwise defined, 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. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the application described herein without departing from the scope or spirit of the application. Other embodiments will be apparent to those skilled in the art from consideration of the specification of the present application. The specification and examples of the present application are exemplary only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
In order to realize rapid and massive resource utilization of magnesite waste rock and tailings, relieve the demand for natural sand stone materials in road construction and reduce road construction cost, the invention provides a magnesite mining and stripping waste rock pavement base material based on industrial solid waste and an application method thereof.
The technical problems solved by the invention are as follows:
1. grading design
In order to ensure that coarse aggregates in the mixture can provide support, fine aggregates can fill gaps among coarse particles, and the compactness of the material is improved, so that better working performance is obtained. Therefore, the cement stabilized magnesite waste rock and tailing mixture is subjected to grading design.
The grain size distribution data of each grade of aggregate is obtained through screening test, grading design is carried out by adopting a numerical method-planning solution method, and the nominal maximum grain size and the content of the stabilized material are controlled so as to ensure better construction workability of the mixture.
2. Determination of Water content
Under the compaction effect, the aggregate particles overcome capillary pressure or combined water shearing resistance to generate relative displacement rearrangement distribution. When the mixture of magnesite waste stone and tailings is in the optimal water content, a water film wrapped on the surfaces of aggregate particles plays a role in lubrication, the frictional resistance among particles is minimum, and the density of the mixture is maximum under a certain unit compaction work.
And simulating the compaction process of the cement stabilizing material on the construction site by adopting an indoor compaction test. According to the relation curve of dry density and water content drawn by compaction test results, the optimal water content corresponding to the mixture with different cement dosages can be obtained.
3. Cement dosage
The dosage of the inorganic binder is proportional to the strength of the mix and inversely proportional to the cost of the mix. And taking the lowest dosage of the inorganic binder under the condition that the strength meets the requirement.
4. Preparation of the mixture
1) Firstly weighing 3807.8 parts of waste magnesite and 3807.8 parts of tailings of magnesite with the mass ratio of 10-20mm and 2085.3 parts of waste magnesite with the mass ratio of 5-10mm in advance for 4 hours, adding 3173.2 parts of waste magnesite and tailings of 0-5mm into 382.4 parts of water, and placing the evenly stirred premix into a closed container or a plastic pocket for soaking for later use.
2) 188.7 Parts of water, 362.6 parts of cement and premix are taken, the prefabricated premix, cement and water are sequentially put into a stirrer, and the mixture is stirred uniformly, thus the mixture of industrial solid waste-based magnesite waste rock and tailing pavement base materials is obtained.
5. Paving
When the product is applied in construction, the mixture of the processed industrial solid waste magnesite waste stone and the tailing pavement base material is paved, the road roller is rolled and molded, and the water is preserved and maintained after the molding, so that the requirement of the compressive strength of the secondary and below road base can be met after 7 days.
The "room temperature" as used herein is calculated as 25.+ -. 2 ℃ unless otherwise indicated. The "parts" in the present invention are all parts by mass unless otherwise specified.
The raw materials used in the following examples of the present invention are all commercially available. The waste magnesite and magnesite tailings used in the invention are mixtures of waste magnesite and magnesite tailings, and have no fixed proportion.
The following examples serve as further illustrations of the technical solutions of the invention.
Example 1
1. Raw material composition (the mixing amount of cement is 4% of the total mass of the magnesite waste rock and the magnesite tailing)
362.6 Parts of inorganic binder, 3807.8 parts of No. 1 material (waste magnesite and magnesite tailings of 10-20 mm), 2085.3 parts of No. 2 material (waste magnesite and magnesite tailings of 5-10 mm), 3173.2 parts of No. 3 material (waste magnesite and magnesite tailings of 0-5 mm) and 571.1 parts of water.
The inorganic binder is 42.5 # ordinary Portland cement;
the water is tap water;
The apparent relative density 2.907-2.937 of the magnesite waste rock and magnesite tailings, the crushing value is less than or equal to 30%, and the content of needle-like particles is less than or equal to 20%.
2. Preparation of the mixture
1) Weighing 10-20mm of waste magnesite and magnesite tailings, 5-10mm of waste magnesite and magnesite tailings, 0-5mm of waste magnesite and magnesite tailings and 382.4 parts of water according to the mass ratio, and placing the evenly stirred premix into a closed container or a plastic pocket for soaking for 4 hours for later use.
2) And sequentially adding the premix, the cement and the rest of water into a stirrer, and uniformly stirring to obtain the mixture.
3. Paving and compacting
And paving the obtained mixture, rolling and forming by a road roller, and maintaining the water at 20+/-2 ℃ for 7 days after forming to obtain the magnesite waste rock and magnesite tailing semi-rigid pavement base material.
Comparative example 1
The difference with example 1 is that the waste magnesite and magnesite tailings are replaced by common crushed stone with the same grading.
Performance testing
1. Freezing resistance: and (3) performing a freeze thawing test on the prepared magnesite waste rock and magnesite tailing semi-rigid pavement base material according to a method of T part 0843-2009 in test procedure of inorganic binder stabilizing materials for highway engineering (JTG part E51-2009), and evaluating the freezing resistance of the material according to the freezing resistance index of the semi-rigid material after 5 freeze thawing cycles.
Wherein: BDR: compressive strength loss (%) of test piece after n freeze-thawing cycles; r DC: compressive strength (MPa) of the test piece after n freeze-thawing cycles; r C: compressive strength (MPa) of the comparative test piece.
The same cement mixing amount is set to be 4%, the freezing resistance of the cement stabilized magnesite waste rock and magnesite tailings and the cement stabilized common broken stone are compared, and the test results are shown in table 1.
Table 1 part freeze thawing test comparative data
As can be seen from the test results in Table 1, under the same freeze thawing test conditions, the frost resistance of the cement stabilized magnesite waste rock and magnesite tailing is better than that of the conventional cement stabilized common crushed stone.
2. Anti-scouring properties: the test adopts a dynamic water pressure generating device, and the set parameters are as follows: the confining pressure is 150Kpa; the axial pressure is 0.6MPa; the flushing frequency is 2Hz.
Under the same test conditions, the ratio of the intensity after 2h of flushing with running water to the intensity before flushing is used as a measurement index to judge the anti-flushing capacity of the test piece. After 2h of running water flushing, the flushing test results of the cement stabilized magnesite waste rock, the magnesite tailings and the cement stabilized common broken stone are shown in table 2.
Table 2 comparative examples of the anti-scour ability
As can be seen from table 2, the cement stabilized magnesite waste rock and magnesite tailings have a higher anti-scour capacity than the conventional cement stabilized plain crushed stone.
Example 2
The difference with example 1 is that the mixing amount of cement is 3%, 5%, 6% and 7% of the total mass of magnesite waste rock and magnesite tailings respectively, and the test result of 7d unconfined compressive strength is shown in figure 1.
As can be seen from fig. 1, as the cement doping amount increases, the compressive strength of the prepared magnesite waste rock and magnesite tailing semi-rigid pavement base material is higher, and the doping amount is determined to be optimal at 4% in consideration of cost and standard problems.
Example 3 (test for determining optimal Water content)
The difference with example 1 is that the mixing amount of water is 5.98%, 5.93%, 5.91% and 5.97% of the total mass of magnesite waste rock, magnesite tailings and cement respectively. The compaction test is carried out on the magnesite waste rock and magnesite tailing semi-rigid pavement base material prepared by the embodiment, and the concrete method comprises the following steps: the compaction test of the cement stabilized magnesite waste rock and tailings is carried out according to the method in the test procedure of inorganic binder stabilizing materials for highway engineering (JTG E51-2009) so as to draw a water content-dry density relation curve of the cement stabilized material, thereby determining the optimal water content and the maximum dry density of the cement stabilized material.
The cement mixing amount is 3%, 4%, 5%, 6%, 7%, the mixing amount is 4.5-7.5%, and the compaction test equipment parameters are as follows: mass of hammer: 4.5Kg; hammer face diameter: 5cm; drop height of the hammer: 45cm; compaction tube size: an inner diameter of 10.0cm, a height of 12.7cm, and a volume of 997cm 3; number of hammering layers: 5 layers; number of hammer strokes per layer: 27 times; average unit compaction work: 2.687J.
Taking not less than 2kg of sample a day before the test, and measuring the natural water content of the aggregate. Taking out about 15kg of materials by a quarter method on the test day, dividing into 5-6 parts averagely, calculating the water adding amount of the sample according to the preset water content, uniformly spraying the water adding amount onto the sample by a spray can, uniformly mixing, and filling into a plastic bag to seal and choke plug for 4 hours. The amount of water to be added is calculated according to formula (3.1):
wherein: m w -the water quantity (g) should be added to the mixture;
m n -aggregate quality (g) in the mixture, and the natural water content of the mixture is w n (%);
m c -cement mass (g), its original water content being w c (%);
design moisture (%) of w-mix.
Adding required stabilizer cement one by one before compaction, uniformly stirring with a small shovel, adding 1/5 of the mixture into a compaction cylinder, leveling the surface, slightly compacting, setting compaction times for 27 times, and compacting the first layer; after the compaction of the first layer is completed, the surface of the sample is roughened by a soil scraping knife, and the above steps are repeated for compaction of the other 4 layers. The mixture added with cement should be subjected to compaction test within 1h, and the sample exceeding 1h after mixing should be discarded. After the last layer is compacted, the test cylinder and the lantern ring are taken down together, after the height of the test sample meets the requirement, the lantern ring is taken down, the surface of the test sample is scraped and trimmed by a soil scraping knife, and the mass of the test cylinder is m 1 after the surface of the test cylinder is cleaned. And after the sample is demoulded, weighing the empty cylinder with the mass of m 2.
Breaking the demoulded test piece by a hammer, taking 2 representative samples from top to bottom in the test piece, putting the test piece into an oven for drying at 110 ℃, and measuring the water content of the test piece.
The water content and dry density are calculated as follows:
Wherein: ρ w —the wet density of the stabilizing material (g/cm 3);
m 1 -total weight of compaction cylinder and wet sample (g);
m 2 -compaction cylinder mass (g);
v-compaction cylinder volume (cm 3).
Wherein: ρ d —the dry density of the stabilizing material (g/cm 3);
w-moisture content (%) of stabilizing material.
The dry density-water content relationship plotted according to the compaction test results is shown in fig. 2. As can be seen from fig. 2, the compaction curve of the cement stabilized magnesite waste rock and tailings mixture has a peak value because the aggregate particles are rearranged and distributed in relative displacement against capillary pressure or combined water shear resistance under the compaction effect. When the mixture is in the optimal water content, the water film wrapped on the surfaces of the aggregate particles plays a role in lubrication, the frictional resistance among the particles is minimum, and the density of the mixture is maximum under a certain unit compaction work. When the water content of the mixture is smaller than the optimal water content, the water film on the surface of the particles is thinner, the inter-particle resistance is larger, and the compaction is not easy; when the water content of the mixture is larger than the optimal water content, the lubrication effect of the water film on the surface of the particles is no longer positive gain, the inter-particle pores are filled with free water to saturation, and more compaction work is absorbed by the water, so that the dry density is no longer increased.
In conclusion, after the magnesite waste rock and magnesite tailing semi-rigid pavement base material prepared by the method is cured for 7 days, the compressive strength requirements of the secondary and below secondary pavement base materials can be met (refer to the technical rules for construction of pavement base materials of roads (JTG/T F20-2015)). And has better frost resistance and scouring resistance than the traditional cement stabilized macadam.
Comparative example 2
The same as in example 1, except that 362.6 parts of inorganic binder, 3625.9 parts of No. 1 material (waste magnesite and magnesite tailings of 10-20 mm), 1995.8 parts of No. 2 material (waste magnesite and magnesite tailings of 5-10 mm), 3444.6 parts of No. 3 material (waste magnesite and magnesite tailings of 0-5 mm) and 571.1 parts of water.
The compression strength of the magnesite waste rock and magnesite tailing semi-rigid pavement base material prepared by the comparative example after 2 hours of running water flushing is 4.29MPa, the freezing resistance index BDR is 91.83%, and the compression strength loss rate after flushing is 5.03%.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.
Claims (6)
1. The semi-rigid pavement base material is characterized in that magnesite waste rock and magnesite tailings with graded design are used as aggregate of the pavement base material, and the grain size ranges of the magnesite waste rock and the magnesite tailings are 10-20mm, 5-10mm and 0-5mm.
2. The magnesite waste rock and magnesite tailing semi-rigid pavement base material of claim 1, wherein the mass ratio of the magnesite waste rock to the magnesite tailing is 1:0.4-0.6:0.7-0.9, and the grain size ranges are 10-20mm, 5-10mm and 0-5 mm.
3. The magnesite waste rock and magnesite tailing semi-rigid pavement base material according to claim 1, wherein the raw materials of the magnesite waste rock and magnesite tailing semi-rigid pavement base material comprise magnesite waste rock and magnesite tailing, cement and water; the mixing amount of the cement is 3-7% of the total mass of the magnesite waste rock and the magnesite tailings; the mixing amount of the water is 5-7% of the total mass of the magnesite waste rock and the magnesite tailings and cement.
4. The magnesite waste rock and magnesite tailing semi-rigid pavement base material of claim 1, wherein the apparent relative density of the magnesite waste rock and the magnesite tailing is 2.907-2.937g/cm 3, the crushing value is less than or equal to 30%, and the content of needle-like particles is less than or equal to 20%.
5. A method for preparing the magnesite waste rock and magnesite tailing semi-rigid pavement base material as set forth in any one of claims 1 to 4, which includes the steps of: weighing raw materials according to mass, mixing magnesite waste rock and magnesite tailings with the particle size of 10-20mm, magnesite waste rock and magnesite tailings with the particle size of 5-10mm, and magnesite waste rock and magnesite tailings with the particle size of 0-5mm, and carrying out infiltration treatment under a closed condition after uniformly stirring; mixing the soaked mixture, cement and the rest water, uniformly stirring, paving, compacting and maintaining to obtain the magnesite waste rock and magnesite tailing semi-rigid pavement base material.
6. Use of the magnesite waste rock and magnesite tailing semi-rigid pavement base material of any one of claims 1 to 4 in pavement material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410062858.4A CN117886532A (en) | 2024-01-16 | 2024-01-16 | Magnesite waste rock and magnesite tailing semi-rigid pavement base material and preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410062858.4A CN117886532A (en) | 2024-01-16 | 2024-01-16 | Magnesite waste rock and magnesite tailing semi-rigid pavement base material and preparation method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117886532A true CN117886532A (en) | 2024-04-16 |
Family
ID=90647020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410062858.4A Pending CN117886532A (en) | 2024-01-16 | 2024-01-16 | Magnesite waste rock and magnesite tailing semi-rigid pavement base material and preparation method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117886532A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108017340A (en) * | 2017-12-27 | 2018-05-11 | 大连地拓环境科技有限公司 | A kind of magnesite tailings pervious concrete and preparation method thereof |
| EP3459918A1 (en) * | 2017-09-26 | 2019-03-27 | Kajaanin Ammattikorkeakoulu Oy | Early strength geopolymer binder material and method for using it |
| CN110066128A (en) * | 2019-04-30 | 2019-07-30 | 镇江苏博特新材料有限公司 | A kind of magnesia swelling agent and preparation method thereof using the preparation of high calcium magnesite tailing |
| CN114292064A (en) * | 2021-11-11 | 2022-04-08 | 沈阳建筑大学 | Semi-rigid base course of cement stabilized iron tailing road surface |
| CN114790087A (en) * | 2022-05-05 | 2022-07-26 | 中路高科交通检测检验认证有限公司 | Semi-rigid base layer raw material proportion design method for cement-stabilized steel slag |
-
2024
- 2024-01-16 CN CN202410062858.4A patent/CN117886532A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3459918A1 (en) * | 2017-09-26 | 2019-03-27 | Kajaanin Ammattikorkeakoulu Oy | Early strength geopolymer binder material and method for using it |
| CN108017340A (en) * | 2017-12-27 | 2018-05-11 | 大连地拓环境科技有限公司 | A kind of magnesite tailings pervious concrete and preparation method thereof |
| CN110066128A (en) * | 2019-04-30 | 2019-07-30 | 镇江苏博特新材料有限公司 | A kind of magnesia swelling agent and preparation method thereof using the preparation of high calcium magnesite tailing |
| CN114292064A (en) * | 2021-11-11 | 2022-04-08 | 沈阳建筑大学 | Semi-rigid base course of cement stabilized iron tailing road surface |
| CN114790087A (en) * | 2022-05-05 | 2022-07-26 | 中路高科交通检测检验认证有限公司 | Semi-rigid base layer raw material proportion design method for cement-stabilized steel slag |
Non-Patent Citations (2)
| Title |
|---|
| 傅匀等: "水泥稳定菱镁废石及尾矿路用性能研究", 《辽宁科技大学学报》, vol. 46, no. 6, 31 December 2023 (2023-12-31), pages 1 - 2 * |
| 魏青瑞: "《公路工程施工中的试验检测》", 31 August 2015, 山东大学出版社, pages: 238 - 239 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Siddiqua et al. | Chemical stabilization of rammed earth using calcium carbide residue and fly ash | |
| Zhang et al. | Thermal conductivity of cement stabilized earth blocks | |
| Mashaly et al. | Effects of marble sludge incorporation on the properties of cement composites and concrete paving blocks | |
| Wu et al. | Water transport and resistance improvement for the cementitious composites with eco-friendly powder from various concrete wastes | |
| Uygunoğlu et al. | The effect of fly ash content and types of aggregates on the properties of pre-fabricated concrete interlocking blocks (PCIBs) | |
| Saygili | Use of waste marble dust for stabilization of clayey soil | |
| Andrade et al. | Evaluation of concrete incorporating bottom ash as a natural aggregates replacement | |
| Alavéz-Ramírez et al. | The use of sugarcane bagasse ash and lime to improve the durability and mechanical properties of compacted soil blocks | |
| Horpibulsuk et al. | Strength of sustainable non-bearing masonry units manufactured from calcium carbide residue and fly ash | |
| Ma et al. | Effects of fire-damaged concrete waste on the properties of its preparing recycled aggregate, recycled powder and newmade concrete | |
| Jindal et al. | Behavioural study of pavement quality concrete containing construction, industrial and agricultural wastes | |
| Ma et al. | Properties and activation modification of eco-friendly cementitious materials incorporating high-volume hydrated cement powder from construction waste | |
| Chouhan et al. | Investigating use of dimensional limestone slurry waste as fine aggregate in mortar | |
| Oti et al. | The development of unfired clay building material using Brick Dust Waste and Mercia mudstone clay | |
| Ducman et al. | The applicability of different waste materials for the production of lightweight aggregates | |
| Qiu et al. | Deterioration characteristics of coal gangue concrete under the combined action of cyclic loading and freeze-thaw cycles | |
| Mollamahmutoglu et al. | Engineering properties of slag-based superfine cement-stabilized clayey soil | |
| GÜRER et al. | Investigation of properties of asphalt concrete containing boron waste as mineral filler | |
| CN112537925A (en) | High-performance concrete applying machine-made sand | |
| CN110407528A (en) | A kind of mixing cured soil body road basement material of steel slag | |
| Jamshidvand et al. | Effect of cement and zeolite on silty sand samples under freeze–thaw cycles | |
| Yan et al. | Study on preparation and performance of steel slag asphalt mixture based on steel slag aggregate | |
| WO1999052837A1 (en) | Chemical agent for improving the engineering properties of soil | |
| Chouhan et al. | Effect of Kota stone slurry on strength properties of cement mortar mixes | |
| CN113582641A (en) | Inorganic mixture prepared from construction waste recycled aggregate and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |