CN110441106B - Preparation method of inorganic binder roadbed shrinkage deformation test piece based on construction waste - Google Patents
Preparation method of inorganic binder roadbed shrinkage deformation test piece based on construction waste Download PDFInfo
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- CN110441106B CN110441106B CN201910723233.7A CN201910723233A CN110441106B CN 110441106 B CN110441106 B CN 110441106B CN 201910723233 A CN201910723233 A CN 201910723233A CN 110441106 B CN110441106 B CN 110441106B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the technical field of construction waste, and discloses a preparation method of an inorganic binder roadbed shrinkage deformation test piece based on the construction waste, which comprises the following preparation steps: 1) uniformly mixing inorganic binder based on construction waste, filling the inorganic binder into a plastic bag, and sealing for not less than 24 hours; 2) taking out the inorganic binder, and adding cement; 3) placing the inorganic binder in a die, and using a pressure head to carry out static pressure on the inorganic binder in the die to form a shrinkage deformation test piece with the compactness of not less than 98%; 4) the shrinkage deformation test piece is placed in a constant-temperature constant-humidity curing room for curing, and the curing age is not less than 7 days; the inorganic binding material is prepared, cement is added into the inorganic binding material before the shrinkage deformation test piece is formed, then a static pressure method is adopted in a mould, so that the inorganic binding material is formed into the shrinkage deformation test piece, the shrinkage deformation test piece is maintained, and the whole preparation process is simple.
Description
Technical Field
The invention relates to the technical field of construction waste, in particular to a preparation method of an inorganic binder roadbed shrinkage deformation test piece based on the construction waste.
Background
The road subgrade filled with the construction waste subgrade mixture stabilized by the inorganic binder is similar to the road subgrade filled with clay, and when the ambient environmental factors such as humidity, temperature and the like change, the mixture for filling the road subgrade can shrink to a certain extent. When the mixed materials shrink and deform, cracks can be generated on the road subgrade, rainwater can enter the road subgrade along the cracks, and the pavement structure of the road is finally damaged under the action of the cyclic load of vehicles running on the road. Therefore, research on the shrinkage performance of the construction waste roadbed mixture with stable inorganic binder is needed to provide theoretical guidance for practical engineering.
At present, drying shrinkage is volume shrinkage of the mixture caused by the change of water content of the construction waste roadbed mixture with stable inorganic binder. The basic principle of drying shrinkage is volume change caused by capillary tension, interlayer water action of mineral crystals or gels, interaction between adsorbed water and water molecules, and carbonization dehydration. The concrete expression is as follows:
in the prior art, inorganic binder roadbed shrinkage deformation test pieces based on construction waste need to be prepared for research on inorganic binder roadbed shrinkage deformation based on construction waste, so that the problem that road roadbed filled with inorganic binder based on construction waste cannot be damaged due to shrinkage deformation in subsequent practical engineering is solved through research on shrinkage deformation performance of the inorganic binder roadbed shrinkage deformation test pieces based on construction waste in a laboratory.
Disclosure of Invention
The invention aims to provide a preparation method of an inorganic binder roadbed shrinkage deformation test piece based on construction waste, and aims to solve the problem that the inorganic binder roadbed shrinkage deformation test piece based on the construction waste is complex to prepare in the prior art. A (c)
The invention discloses a preparation method of an inorganic binder roadbed shrinkage deformation test piece based on construction waste, which is characterized by comprising the following preparation steps:
1) uniformly mixing inorganic binder based on construction waste, putting the inorganic binder into a plastic bag, and sealing for not less than 24 hours;
2) taking out the inorganic binder in the plastic bag, and adding cement;
3) placing the inorganic binder added with cement into a mold, and performing static pressure in a room by using a pressure head to perform static pressure on the inorganic binder in the mold so as to mold the inorganic binder into a shrinkage deformation test piece with the compactness of not less than 98%;
4) and placing the molded shrinkage deformation test piece in a constant-temperature and constant-humidity curing room for curing, wherein the curing age is not less than 7 days.
Further, in the first 1 day of the life-preserving period, soaking the shrinkage deformation test piece in the curing chamber in water for not less than 24 hours; and when the mass of the soaked shrinkage deformation test piece exceeds the set standard mass value, performing waste treatment.
Further, the temperature range in the curing chamber is 18-22 ℃; and the relative humidity in the curing chamber is not lower than 90%.
Further, the construction waste is used as a sample, and the sample is uniformly mixed with lime or fly ash or mineral powder to form the inorganic binder.
Further, in the preparation step 1), after the inorganic binder is placed in a plastic bag, the plastic bag is placed in a flat state, and the inorganic binder placed in the plastic bag is placed in a flat state; the inorganic binder in the plastic bag is divided into a plurality of strip-shaped bodies by a plurality of partition laths which are arranged in parallel and are pressed against the plastic bag.
Furthermore, the shrinkage deformation test piece is cuboid, a pressure cavity with an opening at the upper end is formed in the die, and the shape of the pressure cavity is consistent with that of the shrinkage deformation test piece; the length, the width and the height of the strip body are respectively and correspondingly larger than those of the pressure cavity.
Further, a plurality of the strips are taken out of the plastic bag, and each strip is added with cement independently and is uniformly mixed with the cement.
Further, after the soaked shrinkage deformation test piece is fished out of water, the visible free water on the surface of the shrinkage deformation test piece is sucked away by a wringed wet towel, and then the shrinkage deformation test piece is weighed.
Furthermore, a pressing cavity of the die is provided with a vertical inner side wall, a bonding film is attached to the inner side wall of the pressing cavity, and a movable plate is arranged at the bottom of the pressing cavity; a through hole which is vertically arranged is formed in the bottom of the mold and is communicated with the pressure cavity and the outside of the mold, a movable rod penetrates through the through hole, the upper end of the movable rod is connected to a movable plate, the lower end of the movable rod extends out of the mold, and the movable rod drives the movable plate to move up and down; when inorganic binder is arranged in press the intracavity when, the fly leaf laminating is in press the bottom in chamber, the closing cap the through-hole works as press the shrink deformation test piece shaping back of intracavity, through the movable rod drive fly leaf moves up, will press the shrink deformation test piece ejecting of intracavity press the chamber, and originally laminating and being in press the laminating of laminating membrane on the intracavity inside wall to be in on the lateral wall of shrink deformation test piece, work as the shrink deformation test piece is ejected press the chamber after, tear the laminating membrane on the shrink deformation test piece lateral wall.
Furthermore, the laminating film is provided with a laminating surface which is laminated on the shrinkage deformation test piece, and the laminating surface of the laminating film is raised to form a raised point.
Compared with the prior art, the preparation method of the inorganic binder roadbed shrinkage deformation test piece based on the construction waste, provided by the invention, comprises the steps of firstly preparing the inorganic binder, adding cement into the inorganic binder before forming the shrinkage deformation test piece, then adopting a static pressure method in a mould to form the inorganic binder into the shrinkage deformation test piece, and carrying out maintenance treatment on the shrinkage deformation test piece, wherein the whole preparation process is simple.
Drawings
FIG. 1 is a schematic flow chart of a method for preparing an inorganic binder roadbed shrinkage deformation test piece based on construction waste according to the invention;
FIG. 2 is a schematic perspective view of a shrinkage deformation test piece provided by the present invention;
FIG. 3 is a schematic perspective view of a mold provided by the present invention;
fig. 4 is a schematic perspective view of the bonding surface provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, so that the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present invention, and those skilled in the art can understand specific meanings of the terms according to specific situations.
Referring to fig. 1-4, preferred embodiments of the present invention are shown.
The preparation method of the inorganic binder roadbed shrinkage deformation test piece based on the construction waste comprises the following preparation steps:
1) uniformly mixing inorganic binder based on construction waste, putting the inorganic binder into a plastic bag, and sealing for not less than 24 hours; the materials can be mixed in a mixing machine to ensure that the mixing is more uniform, and can also be manually mixed, and the concrete needs can be determined according to actual needs;
2) taking out the inorganic binder in the plastic bag, and adding cement;
3) placing the inorganic binder added with cement into a mold 200, and performing static pressure in a room by using a pressure head to perform static pressure on the inorganic binder in the mold 200 to form the inorganic binder into a shrinkage deformation test piece 100 with the compactness of not less than 98%;
4) and placing the molded shrinkage deformation test piece 100 in a constant-temperature constant-humidity curing chamber for curing, wherein the curing age is not less than 7 days.
According to the preparation method of the inorganic binder roadbed shrinkage deformation test piece based on the construction waste, the inorganic binder is prepared firstly, cement is added into the inorganic binder before the shrinkage deformation test piece 100 is formed, then the static pressure method is adopted in the mold 200, so that the inorganic binder is formed into the shrinkage deformation test piece 100, the shrinkage deformation test piece 100 is maintained, and the whole preparation process is simple.
Before mixing the inorganic binder, mixing the construction waste and the like according to the optimal water content measured by a compaction test; when the shrinkage deformation test piece 100 is pressed in the mold 200, static pressing is performed according to the regulations of the test for inorganic binder stabilizing materials for road engineering (JTG E51-2009).
In the first 1 day of the life-preserving period, the shrinkage deformation test piece 100 in the curing chamber is soaked in water for not less than 24 hours, so that the inside of the whole shrinkage deformation test piece 100 is ensured to be permeated; after the soaked shrinkage deformation test piece 100 is taken out, the shrinkage deformation test piece 100 is weighed, when the mass of the shrinkage deformation test piece 100 exceeds a set standard mass value, the test piece is subjected to waste treatment, and when the mass of the shrinkage deformation test piece 100 does not exceed the set standard mass value, the test piece 100 is considered to be qualified. The standard mass value set here depends on the shrinkage deformation test pieces 100 of different shapes and sizes.
The temperature range in the curing chamber is 18-22 ℃; the relative humidity in the curing chamber is not lower than 90%. During the whole curing process, the temperature and the humidity in the whole curing chamber are ensured to be kept constant, or the variation range of the temperature and the humidity is lower than 2 percent.
Uniformly mixing a sample with lime or fly ash or mineral powder by using construction waste as a sample to form the inorganic binder; according to different requirements, lime or fly ash or mineral powder is required to be added, which can be determined according to actual requirements.
In the preparation step 1), after the inorganic binder is placed in the plastic bag, the plastic bag is laid flat, and the inorganic binder placed in the plastic bag is placed in a flat shape, which is equivalent to the inorganic binder in a cake shape; the plurality of partition strips are pressed against the plastic bag and arranged in parallel, and divide the inorganic binder in the plastic bag into a plurality of strip-shaped bodies, so that the strip-shaped bodies are independently sealed, sealing and maintenance are facilitated, the strip-shaped bodies are independently opened, the performance of each strip-shaped body can be ensured to be consistent, and the performance of a subsequent single strip-shaped body is more consistent after the single strip-shaped body is formed into the shrinkage deformation test piece 100.
The shrinkage deformation test piece 100 is in a cuboid shape, a pressure cavity 201 with an opening at the upper end is arranged in the die 200, and the shape of the pressure cavity 201 is consistent with that of the shrinkage deformation test piece 100; the length, width and height of the bar are respectively larger than those of the pressure chamber 201. In this way, it is ensured that each strip is sufficiently formed into the shrinkage deformation test piece 100 in the length, width and height directions, so that the performance of the formed shrinkage deformation test piece 100 is better.
And taking a plurality of strips out of the plastic bag, adding cement into each strip separately, uniformly mixing the strips with the cement, and placing the mixed mixture into a pressure cavity 201 of the mold 200.
After the soaked shrinkage deformation test piece 100 is fished out of the water, the wet towel which is wrung out is used for sucking away the free water which is visible on the surface of the shrinkage deformation test piece 100, and then the shrinkage deformation test piece 100 is weighed. Through the wet towel of wringing out, can guarantee to suck away the visible free water on shrinkage deformation test piece 100 surface, and avoid sucking away the moisture inside shrinkage deformation test piece 100, cause the influence to the performance of whole shrinkage deformation test piece 100.
The pressure cavity 201 of the mold 200 is provided with a vertical inner side wall, the inner side wall of the pressure cavity 201 is adhered with the adhesive film 300, the adhesive film 300 and the inner side wall of the pressure cavity 201 can be simply adhered at the edge, and the adhesive film 300 can be fixed at a good position in the early stage; after the inorganic binder is filled in the pressure cavity 201, in the process of static pressure, the side wall of the formed shrinkage deformation test piece 100 is directly contacted with the laminating film 300 and cannot be contacted with the side wall of the pressure cavity 201, so that the shrinkage deformation test piece 100 is separated from the pressure cavity in the follow-up process, the operation is convenient, and the shrinkage deformation test piece 100 is protected.
A movable plate is arranged at the bottom of the pressure cavity 201; the bottom of the die 200 is provided with a through hole which is vertically arranged, the through hole is communicated with the pressure cavity 201 and the outside of the die 200, a movable rod is arranged in the through hole in a penetrating mode, and the movable rod can move up and down in the through hole. The upper end of the movable rod is connected to the movable plate, the lower end of the movable rod extends out of the mold 200, and the movable rod drives the movable plate to move up and down in the pressure cavity 201.
When the inorganic binder is placed in the pressure cavity 201, the movable plate is attached to the bottom of the pressure cavity 201, the through hole is sealed, after the shrinkage deformation test piece 100 in the pressure cavity 201 is molded, the movable plate is driven to move upwards through the movable rod, the shrinkage deformation test piece 100 in the pressure cavity 201 is ejected out of the pressure cavity 201, the adhesive film 300 originally attached to the inner side wall of the pressure cavity 201 is attached to the side wall of the shrinkage deformation test piece 100, and after the shrinkage deformation test piece 100 is ejected out of the pressure cavity 201, the adhesive film 300 on the side wall of the shrinkage deformation test piece 100 is torn off.
In order to further realize the sealing of the movable plate to the through hole, the movable plate has a lower surface arranged downwards, an elastic sealing layer is arranged on the lower surface of the movable plate, and the elastic sealing layer is arranged in a surrounding manner and surrounds the periphery of the movable rod, so that when the movable plate is pressed against the bottom of the pressing cavity 201, the elastic sealing layer plays a role in sealing the periphery of the through hole.
The adhesive film 300 is provided with an adhesive surface adhered to the shrinkage deformation test piece 100, the central position of the adhesive surface of the adhesive film 300 is convex, and a convex point 301 is formed, so that the adhesive film 300 is conveniently and stably arranged on the side wall of the shrinkage deformation test piece 100, the adhesive film 300 is prevented from being damaged in the jacking process of the shrinkage deformation test piece 100, and after the shrinkage deformation test piece 100 is completely separated from the pressure cavity 201, the adhesive film 300 is convenient to tear, in addition, the convex point 301 is formed at the central position of the adhesive film 300, so that a concave point 101 is formed at the center corresponding to the side edge of the shrinkage deformation test piece 100, and thus, the subsequent shrinkage deformation test piece 100 can be conveniently positioned in a shrinkage deformation test.
In order to ensure the performance of the shrinkage deformation test piece 100, the shrinkage deformation test piece 100 has four long edges, and after the shrinkage deformation test piece 100 is taken out of the pressure chamber 201, the long edges of the shrinkage deformation test piece 100 are chamfered.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, which is intended to cover any modifications, equivalents, improvements, etc. within the spirit and scope of the present invention.
Claims (5)
1. The preparation method of the inorganic binder roadbed shrinkage deformation test piece based on the construction waste is characterized by comprising the following preparation steps:
1) uniformly mixing inorganic binder based on construction waste, filling the inorganic binder into a plastic bag, and sealing for not less than 24 hours;
2) taking out the inorganic binder in the plastic bag, and adding cement;
3) placing the inorganic binder added with cement into a mold, and carrying out static pressure method indoors by using a pressure head to carry out static pressure on the inorganic binder in the mold, so that the inorganic binder is molded into a shrinkage deformation test piece with the compactness of not less than 98%;
4) placing the molded shrinkage deformation test piece in a constant-temperature constant-humidity curing chamber for curing, wherein the curing age is not less than 7 days;
adopting construction waste as a sample, and uniformly mixing the sample with lime or fly ash or mineral powder to form the inorganic binder;
in the preparation step 1), after the inorganic binder is placed in a plastic bag, placing the plastic bag in a flat state, and placing the inorganic binder placed in the plastic bag in a flat state; pressing a plurality of partition strips against the plastic bag, wherein the partition strips are arranged in parallel and divide the inorganic binder in the plastic bag into a plurality of strip-shaped bodies;
in the preparation step 2), taking out a plurality of the strip-shaped bodies from the plastic bag, adding cement into each strip-shaped body independently, and uniformly mixing the strip-shaped bodies with the cement;
the die is characterized in that a pressing cavity of the die is provided with a vertical inner side wall, a bonding film is attached to the inner side wall of the pressing cavity, and a movable plate is arranged at the bottom of the pressing cavity; a through hole which is vertically arranged is formed in the bottom of the mold and is communicated with the pressure cavity and the outside of the mold, a movable rod penetrates through the through hole, the upper end of the movable rod is connected to a movable plate, the lower end of the movable rod extends out of the mold, and the movable rod drives the movable plate to move up and down; when the inorganic binder is arranged in the pressure cavity, the movable plate is attached to the bottom of the pressure cavity, the through hole is sealed, after a shrinkage deformation test piece in the pressure cavity is formed, the movable plate is driven to move upwards through the movable rod, the shrinkage deformation test piece in the pressure cavity is ejected out of the pressure cavity, an adhesive film originally attached to the inner side wall of the pressure cavity is attached to the side wall of the shrinkage deformation test piece, and after the shrinkage deformation test piece is ejected out of the pressure cavity, the adhesive film on the side wall of the shrinkage deformation test piece is torn off;
the movable plate is provided with a lower surface which is arranged downwards, an elastic sealing layer is arranged on the lower surface of the movable plate, and the elastic sealing layer is in a surrounding shape and is arranged around the periphery of the movable rod;
the laminating film is provided with a laminating surface which is laminated on the shrinkage deformation test piece, the laminating surface of the laminating film is raised to form a raised point, and a sunken point is formed at the center of the side edge of the shrinkage deformation test piece correspondingly;
the shrinkage deformation test piece is provided with four long edges, and after the shrinkage deformation test piece is taken out of the pressure cavity, the long edges of the shrinkage deformation test piece are subjected to chamfering treatment.
2. The method for preparing a roadbed shrinkage deformation test piece of an inorganic binder based on construction waste as claimed in claim 1, wherein the shrinkage deformation test piece in the curing chamber is soaked in water for not less than 24 hours in the first 1 day of the curing period; and when the mass of the soaked shrinkage deformation test piece exceeds the set standard mass value, performing waste treatment.
3. The method for preparing a roadbed shrinkage deformation test piece of an inorganic binder based on construction waste as claimed in claim 1, wherein the temperature in the curing chamber is in the range of 18 ℃ to 22 ℃; and the relative humidity in the curing chamber is not lower than 90%.
4. The method for preparing a shrinkage deformation test piece of an inorganic binder road bed based on construction waste according to claim 1, wherein the shrinkage deformation test piece is rectangular parallelepiped, the mold has a pressure cavity with an opening at the upper end, and the shape of the pressure cavity is identical to the shape of the shrinkage deformation test piece; the length, the width and the height of the strip body are respectively and correspondingly larger than those of the pressure cavity.
5. The method for preparing a shrinkage test piece of inorganic binder roadbed based on construction waste as claimed in claim 1, wherein after the soaked shrinkage test piece is taken out of water, the wet towel which is wrung out is used to suck the free water which is visible on the surface of the shrinkage test piece, and then the shrinkage test piece is weighed.
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| CN105674906A (en) * | 2016-01-26 | 2016-06-15 | 同济大学 | Shrinkage deformation tester for road material at full age and using method of tester |
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| JP2003337089A (en) * | 2002-05-21 | 2003-11-28 | Kashiwagi Mold:Kk | Form for molding specimen for testing concrete strength |
| WO2012006613A2 (en) * | 2010-07-09 | 2012-01-12 | Tribis Engineering, Inc. | Tribometer |
| JP2013011575A (en) * | 2011-06-29 | 2013-01-17 | Marui:Kk | Portable concrete compression testing machine |
| CN206057295U (en) * | 2016-09-19 | 2017-03-29 | 石家庄铁道大学 | A kind of assay device for testing stabilized with inorganic binder material test specimen contraction distortion |
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