CN115504755A - Preparation method and construction process of super-sulfate cement stabilized macadam base material - Google Patents
Preparation method and construction process of super-sulfate cement stabilized macadam base material Download PDFInfo
- Publication number
- CN115504755A CN115504755A CN202211278359.6A CN202211278359A CN115504755A CN 115504755 A CN115504755 A CN 115504755A CN 202211278359 A CN202211278359 A CN 202211278359A CN 115504755 A CN115504755 A CN 115504755A
- Authority
- CN
- China
- Prior art keywords
- super
- cement
- base material
- sulfate
- stabilized macadam
- 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
Images
Classifications
-
- 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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
-
- 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
-
- 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
-
- 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
-
- 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
A preparation method and a construction process of a super-sulfate cement stabilized macadam base material. The cement stabilized macadam base material comprises the following components in parts by weight: 100 parts of aggregate, 3.5-6.0 parts of super sulfate cement and 4.0-5.5 parts of water. The preparation method comprises mixing the above materials, static pressing, and maintaining. Because the characteristics of the super-sulfate cement are different from those of ordinary portland cement, the construction process, the maintenance process, the on-site detection method and the quality control method of the cement stabilized base layer are different from those of the ordinary portland cement. The super-sulfate cement is used for stabilizing the broken stone base material, so that the problems of poor shrinkage resistance, weak erosion resistance, too short initial setting time and the like of the stabilized broken stone base material in the prior art are solved, the service life of a road structure is prolonged while industrial solid wastes are greatly absorbed, the engineering application scene of the super-sulfate cement is widened, and the super-sulfate cement is of great significance to the road comprehensive utilization of the super-sulfate cement.
Description
Technical Field
The invention belongs to the technical field of road base materials, and particularly relates to a preparation method and a construction process of a super-sulfate cement stabilized macadam base material.
Background
The road stabilized macadam base is used as a semi-rigid material, and has wide application in China due to good mechanical property and durability. The stabilized macadam base layer is formed by using graded macadams as aggregates, filling gaps among the aggregates by using a certain amount of cementing materials and enough mortar, and paving and compacting according to an embedding and extruding principle. However, with the shortage and non-regenerability of cement raw materials, the gradual increase of use cost and the further increase of national requirements on environmental protection and discharge, a new green road engineering material needs to be developed to replace the traditional cementing material for highway engineering.
The super-sulfate cement is a hydraulic cementing material with less clinker or no clinker, which is prepared by using granulated blast furnace slag as a main raw material, gypsum as a sulfate activator and an alkaline activator through common grinding or separate grinding. The super-sulfate cement has the characteristics of low hydration heat, strong sulfate corrosion resistance, good durability and the like, can fully utilize industrial solid wastes, belongs to energy-saving and environment-friendly cement, is used for stabilizing a macadam base material, realizes the combination of environmental protection and infrastructure, and provides a new way for the large-scale application of the super-sulfate cement.
CN103408275A discloses a glass fiber concrete based on super sulfate cement, which comprises glass fiber, super sulfate cement, sand, stone, water and water reducing agent, the weight ratio of each component is: 1 part of super-sulfate cement, 0.01-0.10 part of glass fiber, 1.8-2.6 parts of sand, 2.5-3.3 parts of stone, 0.29-0.52 part of water and 0.01-0.025 part of water reducing agent. The invention can obviously improve the alkali-resistant corrosion resistance and the service life of the concrete, but only aims at the category of the concrete.
CN109851303A discloses a low shrinkage corrosion-resistant ultra-high performance concrete, which comprises 49.1-62.9% of super sulfate cement, 20-39.95% of fine aggregate, 0.15-0.5% of water reducing agent, 0.04-0.3% of defoaming agent, 0-0.3% of coagulant, 1.5-25% of fiber and 0-0.4% of retarder. The invention can obviously improve the flexural strength of concrete, reduce the shrinkage and provide a corresponding construction method, but only aims at curtain walls and decorative concrete and does not relate to the preparation and construction process of road materials.
CN111574167A discloses a concrete member resistant to seawater and high-salt environment corrosion, which is cast by raw materials comprising FRP ribs and super-sulfate cement concrete. The super sulfate cement concrete comprises the following raw materials, by weight, 10-20% of super sulfate cement, 25-40% of fine aggregate, 40-55% of coarse aggregate, 4-10% of water and 0.05-0.2% of an additive; the concrete structure has excellent sulfate resistance, but is only for concrete members, and does not relate to a road base structure.
CN108585730A discloses a high strength phosphogypsum based super sulfate cement concrete and a preparation method thereof, wherein the preparation method comprises the following steps: 1) Phosphogypsum ball milling pretreatment: placing phosphogypsum, fly ash, cement, a water reducing agent and water in a ball milling tank for wet milling, and then screening out and aging to obtain phosphogypsum slurry; 2) Preparing concrete: adding the coarse aggregate, the fine aggregate, the water reducing agent, the phosphogypsum slurry and water into a concrete mixer, and stirring and molding. The high-strength phosphogypsum-based super-sulfate cement concrete provided by the invention has the advantages of high strength, short setting time and good volume stability. But only aiming at the category of concrete, the screening and aging processes also obviously increase the production period and increase the engineering cost.
CN111574165A discloses a super-sulfate cement stabilized macadam base material and a preparation and construction method thereof, wherein the base material comprises the following components in parts by mass: 2100-2300 parts of mineral aggregate, 70-110 parts of super-sulfate cement, 100-115 parts of water and 1.5-2.2 parts of fiber. The invention reduces the construction cost, improves the crack resistance and the strength of the base layer and prolongs the service life of the pavement. However, the construction method of the invention does not describe the difference between the cement-stabilized macadam base and the common portland cement-stabilized macadam base, and the construction difficulty is increased after the fiber is added, so that the construction cost is obviously improved, and the large-area popularization is not realized.
CN111848080A discloses a phosphogypsum-based super-sulfate cement stabilizing layer material, which comprises, by weight, 45-55% of wet-milled modified phosphogypsum slurry (calculated by the effective content of phosphogypsum contained in the slurry), 40-45% of slag powder and 5-10% of silicate cement. The invention can effectively delay the construction solidification time and is beneficial to the construction of the pavement base. However, the cement is phosphogypsum-based super-sulfate cement, and the prepared stable rubble layer material has low early strength and is not suitable for extremely heavy and extra-heavy traffic conditions.
The invention of applying desulfurized gypsum-based super-sulfate cement to stabilized macadam base material is not available in the prior patent technology, and the base mixture is tested indoors and applied on siteThe process has a plurality of key control points, is greatly different from common portland cement, needs to be deeply combined with the physical and mechanical characteristics of the super-sulfate cement, and correspondingly provides a key complete invention technology suitable for the construction of the highway base course. In addition, the prior patent related to the application of the super-sulfate cement base course only applies the construction process of the Portland cement, but does not explain the difference of the construction processes of the super-sulfate cement base course and the Portland cement, for example, if the common Portland cement is adopted to construct the highway base course, the EDTA divalent Ca can be adopted as the process quality control method for constructing the highway base course 2+ The titration method, but the pH value of the super-sulfate cement is low, and Ca cannot be stably complexed and titrated 2+ Ions, and then the actual amount of cement in the base mix cannot be accurately calculated.
Therefore, on the basis of the preparation method of the super-sulfate cement stabilized macadam base layer mixture, the invention also carries out system requirements aiming at a base layer construction process, process quality control and field quality detection method, and definitely proposes a barium sulfate turbidimetry method as a quality control method of super-sulfate cement, and the method has no related patent at home and abroad at present. The implementation of the patent has important practical significance for widening the engineering application scene of the super-sulfate cement and popularizing and applying the super-sulfate cement in a large area.
Disclosure of Invention
The invention aims to provide a new application approach for the application of super-sulfate cement, solves the problems of poor shrinkage resistance, weak erosion resistance, short initial setting time and the like of the stabilized macadam base material in the prior art through the preparation, construction, detection and quality control research of the stabilized macadam base material, improves the service life of a road structure while greatly utilizing industrial solid wastes, and has important significance for the comprehensive utilization of the super-sulfate cement road.
The invention provides a super sulfate cement-based stabilized macadam base material which comprises the following components in parts by weight: 100 portions of aggregate, 3.5 to 6.0 portions of super sulfate cement and 4.0 to 5.5 portions of water.
In the invention, the super-sulfate cement is desulfurized gypsum-based super-sulfate cement, and comprises the following components in percentage by mass: 30-40% of desulfurized gypsum, 1-5% of general cement, 15-25% of slag powder, 1-5% of steel slag, 20-30% of fly ash, 1-5% of compound excitant and 1-3% of sugar retarder.
Preferably, the setting time of the super sulfate cement is controlled to be more than or equal to 300min at the initial setting time and less than or equal to 600min at the final setting time.
Preferably, the desulfurized gypsum in the super-sulfate cement is power plant flue gas desulfurized gypsum or dihydrate gypsum (CaSO) 4 ·2H 2 O) reaches 80-90 percent by mass, and the chemical content of the desulfurized gypsum comprises: SO 3 40-45% of CaO, 40-50% of SiO 2 2-5 percent of the crystal water and 10-30 percent of the crystal water.
Preferably, the slag powder in the super sulfate cement is blast furnace slag powder with the grade of more than S95, which meets the regulation of the current national standard of granulated blast furnace slag powder for cement and concrete (GB/T18046).
Preferably, the fly ash in the super sulfate cement is one of primary ash and secondary ash.
Preferably, the general cement in the super-sulfate cement is PO42.5 cement.
In the invention, the fine aggregate is clean stone chips, and the coarse aggregate is limestone macadam with the particle size of 4.75-31.5 mm.
Preferably, the aggregate grading: particle size of 0-5mm, particle size of 5-10mm, particle size of 10-20mm and particle size of 20-30mm; the stone chips with the particle size of 0-5mm are as follows: crushed stone with the particle size of 5-10 mm: crushed stone with the particle size of 10-20 mm: the mass ratio of the crushed stones with the particle size of 20-30mm is (20-35): (15-25): (15-30): (10-25), more preferably 35:20:25:20.
the invention provides a preparation method of a stabilized macadam base material based on super-sulfate cement, which comprises the following steps:
step one, adding a part of aggregate which is doped with water into a closed container or a sealed plastic bag for soaking for standby;
step two, pouring the aggregate completely soaked in the step one into a mixing pot, adding the rest of externally-mixed water, and mixing for 30-40s;
adding super-sulfate cement into the second step, and mixing for 85-95s;
step four, performing static compression molding on the mixture with the compaction degree of 96%, and performing static pressure preparation to obtain a finished product of the stabilized macadam base material based on the super-sulfate cement;
and step five, preserving the mixture obtained in the step four to a corresponding age according to requirements in an environment with the temperature of 25 ℃ and the relative humidity of 95%.
The invention provides a construction process (shown in figure 1) of a stabilized macadam base material based on super sulfate cement, which comprises the following steps:
the method comprises the following steps: uniformly mixing the super-sulfate cement stabilized macadam base material;
step two: spreading the prepared mixture;
step three: rolling the prepared mixture;
step four: maintaining;
step five: detecting on site;
step six: and (5) quality control.
In the invention, the method for uniformly mixing is a conventional method in the field, but the water content and the dry density of the super-sulfate cement base layer material are lower than those of common portland cement, and calibration is carried out before mixing. The uniform mixing is carried out in a stirring device, and before stirring, the cement stabilized macadam base material is conveyed to the stirring device by using a belt conveyor.
In the invention, the paving method should use one or two pavers to pave the whole section simultaneously.
Preferably, the paver needs to be provided with an anti-segregation rubber baffle in front of the spiral distributor, so that segregation of the mixture is reduced.
In the present invention, the rolling method is a conventional rolling method in the art, but the rolling process should strictly control the amount of water used due to the difference between the optimum moisture content and the maximum dry density (see fig. 2). One or more of a double steel wheel roller, a single steel wheel roller and a rubber wheel roller is/are used for rolling. The double-steel-wheel road roller is a heavy road roller with the weight of more than 18 tons. The single steel wheel road roller should select the heavy road roller of more than 26 tons. The rubber-tyred roller should select a heavy roller of more than 18 tons.
Firstly, using a double-steel-wheel road roller, stabilizing the pressure for 1-2 times without vibration, then using a single-steel-wheel road roller to vibrate and roll for 3-4 times, then using the rubber-wheel road roller to roll for 1-2 times (the water supplement amount by rubbing the rubber wheel is strictly controlled in the process), and finally using the double-steel-wheel road roller to perform static pressure for 1-2 times; the specific compaction pass is based on meeting the compaction degree. The 'one-pass' refers to a rolling process that the road roller moves forward and backward on the same track.
In the invention, the rolling speed is 1.5km/h in a pressure stabilizing stage; the speed of the repressing stage is 2km/h; the rolling speed in the final pressing stage is 2.5km/h. Meanwhile, starting and braking should be carried out at a slow speed, and the phenomena of quick starting and emergency braking are avoided.
In the invention, the maintenance process is different from the maintenance of the ordinary silicate cement stabilized base, and after the ordinary silicate stabilized macadam base is paved, water spraying maintenance is started after final setting or the next day; the super-sulfate cement stabilized macadam base layer has slow early-stage hydration reaction and better water-retaining property of the desulfurized gypsum, so that the water requirement at the initial stage of maintenance is low, and the water can be not sprayed in 1-3 days of maintenance and the base layer can be directly covered with geotextile. When the temperature is higher in summer, the watering maintenance can be carried out according to the actual condition, so that the surface of the stable base layer of the super sulfate salt water and mud water is kept in a wet state. The super sulfate cement stabilized macadam base material is not recommended to be constructed when the temperature is lower in winter.
In the invention, the field detection method is different from the common silicate cement base material, and the core sample can be taken out on day 3 after the common silicate stable macadam base is paved; the first core drilling sampling time of the super sulfate cement stabilized macadam foundation is 7-10 days.
Preferably, the flatness is a conventional index in the field, and the flatness of the cement-stabilized macadam foundation material of the invention must be controlled within 0.8 cm.
Preferably, the degree of compaction is a conventional index in the field, and the degree of compaction of the cement stabilized macadam base material is determined by a sand-grouting method.
In the invention, because the EDTA titration method cannot accurately calibrate the dosage of the super-sulfate cement (see figure 3) compared with the ordinary Portland cement, the invention provides the method for calibrating the dosage of the cement in the super-sulfate cement stabilized macadam base material (see figure 4), and compared with the EDTA titration method, the method for titrating Ca in the ordinary Portland cement 2+ Ion, considering the chemical components of super-sulfate cement, the invention adopts barium sulfate turbidimetry to calibrate SO in solution 4- And calculating the ion content to control the cement dosage.
In the invention, a barium sulfate turbidimetric method is adopted to calibrate the cement dosage in the super-sulfate cement stabilized macadam base material, and because sulfate ions in the solution react with barium to generate fine barium sulfate crystals, the aqueous solution is turbid, and the turbidity of the aqueous solution is in direct proportion to the sulfate content in a water sample within a certain concentration range.
The test procedure was as follows:
the method comprises the following steps: preparation of a Mixed stabilizer 75g of sodium chloride were dissolved in 300ml of pure water and 30ml of hydrochloric acid (. Rho.20= 1.19g/ml), 50ml of glycerol and 100ml of ethanol were added
And (4) uniformly mixing.
Step two: barium chloride solution (40 g/l) 40g of barium chloride (BaCl2.2H2O) is weighed and dissolved in pure water and diluted to 1000ml.
Step three: preparation of a sulfate solution (0.05 mg/ml) 1.4786g of anhydrous sodium sulfate dried to a constant weight were weighed and diluted to 0.05mg/ml.
Step four: a sample of 50.0ml of the solution (cement dosage 0%, 2%, 4%, 6%, 8%) was pipetted into a 100ml beaker, 2.5ml of the mixture stabilizer was added and shaken well.
Step five: 5ml of barium chloride solution was slowly added along the wall of the beaker and stirred with a magnetic stirrer for 1min. Immediately pouring the test solution into a 3cm cuvette, taking a 0% solution sample as a comparison sample, measuring absorbance and drawing an absorbance curve.
Step six: 0,1,2,4,6,8 and 10mL of the sulfate standard use solutions were pipetted into a beaker, supplemented with pure water to 50mL, and absorbance was measured to draw a calibration curve.
Step seven: and analyzing the absorbance curve and the calibration curve of the sample to obtain the mass concentration of the sulfate of the sample.
The invention utilizes the super-sulfate cement to prepare the stabilized macadam base material, not only realizes the consumption of industrial solid wastes, but also provides a new way for the large-scale application of the super-sulfate cement. The invention prepares the super-sulfate cement stabilized macadam base material meeting the standard requirements according to the standard 'highway pavement base construction technical rules' (JTG-T-F20-2015), and utilizes super-sulfate cement to solve a series of technical problems of poor shrinkage resistance, weak erosion resistance, too short initial setting time and the like of the stabilized macadam base material in the prior art, provides a control method of the cement dosage of the super-sulfate cement stabilized macadam base material on the basis, and further verifies the feasibility through engineering application.
The invention has the beneficial effects that:
(1) The super-sulfate cement can replace ordinary portland cement by 100 percent, is used for stabilizing the crushed stone base material, realizes large-scale utilization, and has higher economic benefit.
(2) By utilizing the characteristics of the super-sulfate cement, the invention solves a series of technical problems of poor shrinkage resistance, weak erosion resistance, too short initial setting time and the like of the stabilized macadam base material in the prior art.
(3) The invention meets the system requirements on the construction process, the process quality control and the field quality detection method of the super-sulfate cement stabilized macadam foundation, and has important significance for the super-sulfate cement stabilized macadam foundation material.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other implementation drawings can be extended from the drawings provided by those of ordinary skill in the art without inventive effort.
FIG. 1 is a schematic view of the construction process of the super-sulfate cement provided by the present invention as a stabilized macadam base material;
FIG. 2 is a graph showing the water content and dry density of 5.0 parts of ordinary portland cement and super-sulfate cement provided by the present invention;
FIG. 3 is a graph showing the titration of Portland cement and super-sulfate cement by EDTA titration according to the present invention;
FIG. 4 is a cement dosage method step for testing a super sulfate cement stabilized macadam base material using a barium sulfate turbidimetry method according to the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the invention thereto. The experimental methods without specifying specific conditions in the following examples were selected according to the conventional methods and conditions, or according to the commercial instructions. The performance comparisons of the super sulfate cement to the Portland cement and the base course are shown in the following table.
Table 1 shows the difference in physical and mechanical properties between super-sulfate cement and ordinary portland cement;
table 2 shows the comparison of the optimal water content and mechanical properties of the stabilized macadam base materials obtained in the examples and comparative examples 1-3;
table 3 shows the durability of the stabilized macadam base materials obtained in examples and comparative examples 1 to 3.
The first embodiment is as follows: super sulfate cement 4.0 parts by weight of stabilized macadam base material
A super-sulfate cement stabilized macadam base material comprises the following components in parts by weight: aggregate 100 parts and super sulfate cement 4.0 parts. The optimum water content is 3.6%.
The super-sulfate cement is desulfurized gypsum-based super-sulfate cement, and is characterized in that: SO (SO) 3 8.4% of CaO, 40.2% of SiO 2 26.9% of Al 2 O 3 14.3 percent of the desulfurized gypsum based super-sulfate cement and 6.7 percent of MgO, wherein the percentages are mass percentages of the desulfurized gypsum based super-sulfate cement.
The initial setting time of the super-sulfate cement is 460min, the final setting time is 580min, and the water consumption for the standard consistency is 25.6%.
The aggregate grading is as follows: the grain size is 0-5mm, 5-10mm, 10-20mm and 20-30mm; the stone chips with the particle size of 0-5mm are as follows: crushed stone with the particle size of 5-10 mm: crushed stone with the particle size of 10-20 mm: the mass ratio of the crushed stones with the particle size of 20-30mm is (20-35): (15-25): (15-30): (10-25) 35:20:25:20.
the second embodiment: 5.0 parts of super-sulfate cement by weight of stabilized macadam base material
A super-sulfate cement stabilized macadam base material comprises the following components in parts by weight: aggregate 100 parts and super sulfate cement 5.0 parts. The optimum water content is 4.3%.
The super-sulfate cement is desulfurized gypsum-based super-sulfate cement, and the characteristics refer to the first embodiment.
The initial and final setting time and the water consumption for the standard consistency of the super sulfate cement are referred to the first embodiment.
The aggregate grading and particle size are referred to example one.
The third embodiment is as follows: 6.0 parts of super-sulfate cement by weight of stabilized macadam base material
A super-sulfate cement stabilized macadam base material comprises the following components in parts by weight: 100 parts of aggregate and 6.0 parts of super sulfate cement. The optimum water content was 4.9%.
The super-sulfate cement is desulfurized gypsum-based super-sulfate cement, and the characteristics refer to the first embodiment.
The initial and final setting time and the water consumption for the standard consistency of the super sulfate cement are referred to the first embodiment.
The aggregate grading and the particle size are referred to the first embodiment.
The first comparative example: ordinary portland cement 4.0 parts by weight of stabilized macadam base material
A common portland cement stabilized macadam base material comprises the following components in parts by weight: 100 parts of aggregate and 4.0 parts of super sulfate cement. The optimum water content is 5.0%.
The ordinary portland cement is PO42.5 cement and is characterized in that: SO (SO) 3 2.8% of CaO, 48.1% of CaO, siO 2 26.3% of Al 2 O 3 11.7 percent of the cement, 2.5 percent of MgO, and the percentage is the mass percentage of the PO42.5 cement.
The initial setting time of the super-sulfate cement is 162min, the final setting time is 217min, and the water consumption for the standard consistency is 26.8%.
The aggregate grading: particle size of 0-5mm, particle size of 5-10mm, particle size of 10-20mm and particle size of 20-30mm; the stone chips with the particle size of 0-5mm are as follows: crushed stone with the particle size of 5-10 mm: crushed stone with the particle size of 10-20 mm: the mass ratio of the crushed stones with the particle size of 20-30mm is (20-35): (15-25): (15-30): (10-25) 35:20:25:20.
comparative example two: 5.0 parts of ordinary portland cement by weight of stabilized macadam base material
A super-sulfate cement stabilized macadam base material comprises the following components in parts by weight: 100 parts of aggregate and 5.0 parts of super sulfate cement. The optimum water content was 5.9%.
The super-sulfate cement is desulfurized gypsum-based super-sulfate cement, and the characteristics refer to the first comparative example.
The initial and final setting time and the water consumption for the standard consistency of the super sulfate cement are referred to the first comparative example.
The aggregate grading and the particle size are referred to the first comparative example.
Comparative example three: ordinary Portland cement 6.0 parts by weight of stabilized macadam base material
A super-sulfate cement stabilized macadam base material comprises the following components in parts by weight: 100 parts of aggregate and 6.0 parts of super sulfate cement. The optimum water content was 6.7%.
The super-sulfate cement is desulfurized gypsum-based super-sulfate cement, and the characteristics refer to the first comparative example.
The initial and final setting time and the water consumption for the standard consistency of the super sulfate cement are referred to the first comparative case.
The aggregate grading and the particle size are referred to the first comparative example.
The test method refers to JTG/T F20-2015 fine rules for highway pavement base construction technology, JTGE51-2009 test regulations for inorganic binder stabilizing material for highway engineering GB 175-2020 Portland cement, and the physical and mechanical properties of the super-sulfate cement are tested; and testing unconfined compressive strength, splitting strength, water stability coefficient, freeze-thaw stability coefficient, water soaking expansion rate, erosion resistance coefficient and dry shrinkage strain value of the stabilized macadam base material.
TABLE 1 comparison of the physico-mechanical properties of super-sulphate cements with ordinary portland cements
TABLE 2 optimum moisture content and mechanical properties of the stabilized macadam base materials obtained in examples and comparative examples 1 to 3
TABLE 3 durability of stabilized macadam base materials obtained in examples and comparative examples 1 to 3
The test results in table 1 show that compared with ordinary portland cement, the super-sulfate cement has the advantages of lower water consumption for standard consistency, longer setting time and similar strength to portland cement, and can effectively solve the problem of short setting time of a stable base layer of ordinary portland cement water. From the test results in table 2, it can be seen that the optimum moisture content of the super-sulfate cement stabilized macadam base material is lower, and the mechanical properties of the super-sulfate cement stabilized macadam base material are similar to those of the ordinary portland cement stabilized macadam base material, wherein the 28-day super-sulfate cement stabilized macadam base material is better than that of the ordinary portland cement. The test results in table 3 show that the super-sulfate cement stabilized macadam base material has better freeze-thaw resistance and water stability, and the water-soaking expansion rate also meets the specification requirements. Compared with the common portland cement stabilized macadam base material, the super-sulfate cement stabilized macadam base material can reduce the drying shrinkage strain by 27 percent, and sulfate erosion can improve the unconfined compressive strength of the later stage of the concrete and obviously improve the sulfate erosion resistance of the water-stabilized macadam base.
The foregoing examples are provided to facilitate an understanding of the principles of the invention and their core concepts, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that approximate the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (11)
1. A preparation method and a construction process of a super-sulfate cement stabilized macadam base material comprise the following components in parts by weight: 100 portions of aggregate, 4.0 to 6.0 portions of super sulfate cement and 4.0 to 5.5 portions of water.
2. The stabilized macadam base material according to claim 1, wherein the super-sulfate cement is a desulfurized gypsum-based super-sulfate cement comprising, by mass: 30-40% of desulfurized gypsum, 1-5% of general cement, 15-25% of slag powder, 1-5% of steel slag, 20-30% of fly ash, 1-5% of composite excitant and 1-3% of sugar retarder.
3. The desulfurization gypsum according to claim 2, characterized in that: SO (SO) 3 40-45% of CaO, 40-50% of SiO 2 2-5 percent of the crystal water and 10-30 percent of the crystal water.
4. The stabilized macadam foundation material of claim 1 wherein the aggregate is graded such that: particle size of 0-5mm, particle size of 5-10mm, particle size of 10-20mm and particle size of 20-30mm; the stone chips with the particle size of 0-5mm are as follows: crushed stone with the particle size of 5-10 mm: crushed stone with the particle size of 10-20 mm: the mass ratio of the crushed stones with the particle size of 20-30mm is (20-35): (15-25): (15-30): (10-25), wherein the aggregates are all limestone aggregates.
5. The method of making a stabilized macadam base material according to any one of claims 1 to 4 including the steps of: uniformly mixing, static pressing and curing the stabilized macadam base material as recited in any one of claims 1 to 4.
6. A process for applying a stabilized macadam substrate material as claimed in any one of claims 1 to 5 including the steps of: mixing, spreading, rolling, maintaining, on-site detecting and quality controlling.
7. The construction process according to claim 6, wherein: the using amount of the water is preferably 4-6%, and the water accounts for the mass percent of the base material.
Preferably, the super-sulfate cement stabilized macadam base material is lower in water content and dry density than ordinary portland cement as shown in a compaction test, and is calibrated before being mixed.
Preferably, the paving is carried out by using a paver to carry out full-section paving.
8. A compaction process according to claim 6 wherein the compaction is by one or more of a two-drum roller, a single drum roller and a rubber-tyred roller.
Preferably, the rolling step comprises the steps of firstly using the double-steel-wheel road roller, not performing vibration static pressure for 1-2 times, then using the single-steel-wheel road roller to perform vibration rolling for 3-4 times, then using the rubber-wheel road roller to perform rolling for 1-2 times (strictly controlling water supplement amount), and finally using the double-steel-wheel road roller to perform static pressure for 1-2 times.
Preferably, the rolling speed in the pressure stabilizing stage is 1.5km/h; the speed of the repressing stage is 2km/h; the rolling speed in the final pressing stage is 2.5km/h.
9. A curing process according to claim 6, wherein water is not sprayed on days 1-3, and water is uniformly sprayed on the surface of the cured product after day 4, and the cured product is cured for 7 days.
10. The in situ test method of claim 6: the core drilling and sampling time is not suitable to be too early, and the first core drilling and sampling should be carried out 7-10 days.
11. The quality control method according to claim 6: the barium chloride turbidimetry method is proposed to replace an EDTA titration method to control the cement dosage of the stabilized macadam base material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211278359.6A CN115504755A (en) | 2022-10-21 | 2022-10-21 | Preparation method and construction process of super-sulfate cement stabilized macadam base material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211278359.6A CN115504755A (en) | 2022-10-21 | 2022-10-21 | Preparation method and construction process of super-sulfate cement stabilized macadam base material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115504755A true CN115504755A (en) | 2022-12-23 |
Family
ID=84509809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211278359.6A Pending CN115504755A (en) | 2022-10-21 | 2022-10-21 | Preparation method and construction process of super-sulfate cement stabilized macadam base material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115504755A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423343A (en) * | 2008-11-27 | 2009-05-06 | 武汉理工大学 | Steel slag ultra-sulphate cement and preparation method thereof |
| US20110214591A1 (en) * | 2008-08-25 | 2011-09-08 | Tetsuharu Ibaraki | Sulfate resistant ground granulated blast furnace slag, sulfate resistant cement, and method of production of same |
| CN104556887A (en) * | 2013-10-17 | 2015-04-29 | 上海建设机场道路工程有限公司 | Cement stabilized base material, preparation, application and preparation method of road base |
| CN110284409A (en) * | 2019-07-10 | 2019-09-27 | 河南省光大路桥工程有限公司 | Super thick degree paves Vibratory Mixing reworked material Construction of Cement Stabilized Macadam technique |
| CN111302677A (en) * | 2020-02-28 | 2020-06-19 | 江苏一夫科技股份有限公司 | Super-sulfate cement and preparation method thereof |
| CN111517734A (en) * | 2020-04-21 | 2020-08-11 | 廊坊市交通公路工程有限公司 | Low-crack cement stable-graded broken stone base material and preparation and construction methods thereof |
| CN114735955A (en) * | 2022-05-20 | 2022-07-12 | 宁夏交通建设股份有限公司 | Desulfurized gypsum based super-sulfate cement and preparation method thereof |
-
2022
- 2022-10-21 CN CN202211278359.6A patent/CN115504755A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110214591A1 (en) * | 2008-08-25 | 2011-09-08 | Tetsuharu Ibaraki | Sulfate resistant ground granulated blast furnace slag, sulfate resistant cement, and method of production of same |
| CN101423343A (en) * | 2008-11-27 | 2009-05-06 | 武汉理工大学 | Steel slag ultra-sulphate cement and preparation method thereof |
| CN104556887A (en) * | 2013-10-17 | 2015-04-29 | 上海建设机场道路工程有限公司 | Cement stabilized base material, preparation, application and preparation method of road base |
| CN110284409A (en) * | 2019-07-10 | 2019-09-27 | 河南省光大路桥工程有限公司 | Super thick degree paves Vibratory Mixing reworked material Construction of Cement Stabilized Macadam technique |
| CN111302677A (en) * | 2020-02-28 | 2020-06-19 | 江苏一夫科技股份有限公司 | Super-sulfate cement and preparation method thereof |
| CN111517734A (en) * | 2020-04-21 | 2020-08-11 | 廊坊市交通公路工程有限公司 | Low-crack cement stable-graded broken stone base material and preparation and construction methods thereof |
| CN114735955A (en) * | 2022-05-20 | 2022-07-12 | 宁夏交通建设股份有限公司 | Desulfurized gypsum based super-sulfate cement and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 王亮等: "脱硫石膏基超硫酸盐水泥混凝土强度和抗碳化性能研究", 《混凝土与水泥制品》, no. 3, pages 47 - 48 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Aghaeipour et al. | Effect of ground granulated blast furnace slag (GGBFS) on RCCP durability | |
| CN106747128B (en) | A kind of big fluidised form High Strength Non-shrinking Filling Material and preparation method thereof | |
| CN108516781A (en) | A kind of ardealite cement graded broken stone stabilized zone and preparation method thereof | |
| CN112960952B (en) | High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof | |
| CN110734257A (en) | Preparation method of high impervious concrete | |
| CN104379534A (en) | Lightweight concrete with low thermal conductivity | |
| CN109956720A (en) | A kind of light silencing gravity flowing levelling mortar and preparation method thereof | |
| CN108503314A (en) | A kind of unburned pavior brick of addition hydrophobically modified glass fibre | |
| Zhao et al. | High industrial solid waste road base course binder: Performance regulation, hydration characteristics and practical application | |
| CN110204228A (en) | The high low-heat portland cement and its preparation method and application of early strength | |
| CN111253127A (en) | C30 carbon fiber broken brick recycled concrete and preparation method thereof | |
| Dong et al. | Value-added utilization of phosphogypsum industrial by-products in producing green Ultra-High performance Concrete: Detailed reaction kinetics and microstructure evolution mechanism | |
| CN113831065A (en) | Machine-made sand high-performance concrete | |
| CN107311497A (en) | Maintaining swelling agent and preparation method thereof in a kind of concrete | |
| CN112409016A (en) | High-strength foam concrete and preparation method thereof | |
| Cui et al. | Optimization and regulation of pavement concrete properties in plateau environment with large daily temperature difference: From mixture design to field application | |
| CN101497503A (en) | Silicate impervious cement | |
| CN108774033A (en) | A kind of high-strength micro- contraction highway crack mud jacking mortar and highway maintenance method of flowing automatically | |
| CN110818339A (en) | Preparation method of light high-impermeability concrete | |
| CN104631259A (en) | Application method of nano stratified material in cement stabilized crushed stone base | |
| CN104891903B (en) | A kind of super high pump-conveying is adjustable solidifying mortar | |
| CN111268988A (en) | High-water-resistance calcination-free phosphogypsum-based slope building block material and preparation thereof | |
| CN106747186A (en) | A kind of Kerb of concrete prepared with ardealite base hydraulicity composite gel material and preparation method thereof | |
| CN111732381A (en) | Preparation method of phosphorus slag powder concrete | |
| CN115504755A (en) | Preparation method and construction process of super-sulfate cement stabilized macadam base material |
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 |