CN117923846A - Waste slag water stable material proportion externally doped with basalt fibers and evaluation method thereof - Google Patents
Waste slag water stable material proportion externally doped with basalt fibers and evaluation method thereof Download PDFInfo
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- CN117923846A CN117923846A CN202410338295.7A CN202410338295A CN117923846A CN 117923846 A CN117923846 A CN 117923846A CN 202410338295 A CN202410338295 A CN 202410338295A CN 117923846 A CN117923846 A CN 117923846A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 201
- 239000000463 material Substances 0.000 title claims abstract description 185
- 239000002893 slag Substances 0.000 title claims abstract description 48
- 239000002699 waste material Substances 0.000 title claims abstract description 47
- 229920002748 Basalt fiber Polymers 0.000 title claims abstract description 43
- 238000011156 evaluation Methods 0.000 title claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 56
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 28
- 239000004576 sand Substances 0.000 claims abstract description 27
- 230000008014 freezing Effects 0.000 claims abstract description 24
- 238000007710 freezing Methods 0.000 claims abstract description 24
- 238000010257 thawing Methods 0.000 claims description 74
- 230000008859 change Effects 0.000 claims description 39
- 238000005303 weighing Methods 0.000 claims description 19
- 238000002791 soaking Methods 0.000 claims description 13
- 238000012669 compression test Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 206010003549 asthenia Diseases 0.000 claims description 7
- 238000003776 cleavage reaction Methods 0.000 claims description 3
- 230000007017 scission Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 abstract description 22
- 238000011160 research Methods 0.000 abstract 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 19
- 239000002689 soil Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 101100042371 Caenorhabditis elegans set-3 gene Proteins 0.000 description 2
- 101150055297 SET1 gene Proteins 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 235000005979 Citrus limon Nutrition 0.000 description 1
- 244000248349 Citrus limon Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/46—Rock wool ; Ceramic or silicate fibres
- C04B14/4643—Silicates other than zircon
-
- 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
- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a waste slag water stabilizing material proportion of externally doped basalt fiber and an evaluation method thereof, and relates to the field of water stabilizing materials, wherein the waste slag water stabilizing material proportion comprises cement, coarse aggregate, fine aggregate, basalt fiber and water, wherein the coarse aggregate is gravel aggregate with 4.75-26.5mm continuous grading, and the weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm is 13-18:30-40:22-26; the fine aggregate is tunnel waste slag, the tunnel waste slag comprises coarse sand and fine sand, and the weight ratio of the coarse sand to the fine sand is 10-15:12-16. The invention takes waste slag water stable material as a research object, and researches the influence of the fiber on the durability of the water stable material through a splitting test and the research on the freezing resistance of a sample, thereby quickly obtaining the evaluation result of the water stable material.
Description
Technical Field
The invention relates to the field of water stabilizing, in particular to a waste slag water stabilizing ratio of basalt fiber externally doped and an evaluation method thereof.
Background
The road surface structure generally comprises a surface layer, a base layer, a subbase layer, a cushion layer and the like. Wherein the base layer is mainly divided into cement stabilized soil, lime stabilized soil, cement lime comprehensive stabilized soil and lime industry waste residue stabilized soil. Among the class 4 stabilized soils, cement stabilized macadam in cement stabilized soil is widely used because of its good water permeability and strength characteristics,
For highway construction in China, because of the influence of topography and topography, a large amount of waste slag is generated in the tunneling process of the tunnel, and the waste slag is generally searched for a storage yard for disposal at present, so that engineering construction cost is increased, the ecological environment of the storage area is destroyed after long-term storage of the waste slag, and if storm is met, the waste slag also becomes a debris flow source and is easy to cause debris flow disasters.
The waste slag generated in the engineering construction process is utilized to replace part of natural sand aggregate, so that the problems of lack of ground materials and the like are partially solved, and the environmental protection problems of occupation of the slag field and the like are also partially solved. However, the cement stabilized macadam base layer is often insufficient in toughness in the service process, and is easy to generate shrinkage cracks and temperature shrinkage cracks when humidity and temperature change, so that reflection cracks are generated on asphalt pavement, and the service life of the pavement is seriously influenced.
The existing water stable material evaluation method is troublesome to operate and low in efficiency, and is not suitable for a laboratory to quickly obtain the performance evaluation result of the water stable material.
Disclosure of Invention
The invention aims to provide a waste slag water stabilizing material proportion externally doped with basalt fibers and an evaluation method thereof, which inhibit the generation of cracks and improve the performance of water stabilizing materials through cement, coarse aggregate, fine aggregate, basalt fibers and water.
The first invention aims to provide a waste slag water stabilizing material which comprises cement, coarse aggregate, fine aggregate, basalt fiber and water, wherein the coarse aggregate is gravel aggregate with 4.75-26.5mm continuous grading, and the weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm is 13-18:30-40:22-26; the fine aggregate is tunnel waste slag, the tunnel waste slag comprises coarse sand and fine sand, and the weight ratio of the coarse sand to the fine sand is 10-15:12-16.
Wherein, basalt fiber length is 12 mm. The weight ratio of the cement to the basalt fiber is 3-8:0.5-1. The weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm in the coarse aggregate is 16:34:24. The weight ratio of the coarse sand to the fine sand is 12:14. The weight ratio of the cement to the basalt fiber is 5:0.7.
Cement-based materials tend to be relatively brittle, have a compressive strength far greater than the tensile strength, and are prone to cracking when subjected to localized tension during use. The toughness of the cement-based material can be effectively enhanced by the externally doped fiber, and the generation of cracks inside the material can be restrained.
On the basis of the water stabilizing, the evaluation method of the waste slag water stabilizing externally doped with basalt fibers comprises the following steps:
Step 1, carrying out a uniaxial compression test on a water stable material sample to obtain a stress strain curve of the water stable material sample;
step 2, calculating the uniaxial compressive strength of the water stable material sample according to the stress-strain curve to obtain the average strength of the water stable material sample;
Step 3, carrying out splitting test on the water stable material sample, curing 180 d on the water stable material sample, taking the water stable material sample out of a curing box one day before the test, soaking the water stable material sample in water, wiping surface moisture before the test, and measuring the height of a test piece; and (3) placing the water stable material sample in the center of a press head for testing, wherein the loading speed is 1 mm/min, and obtaining the indirect tensile strength of the water stable material sample.
And step 4, obtaining an evaluation conclusion of the water stable material sample according to the average strength and the indirect tensile strength.
Placing a water stable material sample into a constant temperature and humidity curing box for curing, taking out the water stable material sample after curing 180 d, accurately weighing the quality, the height and the diameter of the water stable material sample, soaking the water stable material sample in water, taking out the water stable material sample after soaking 24: 24 h, wiping off surface moisture, and weighing the quality and the height of the water stable material sample;
Placing the water stable material sample into a freezing and thawing test box, wherein the freezing temperature is-18 ℃ and the freezing time is 16 h; after freezing, taking out the sample, immediately placing the sample into a constant temperature water tank at 20 ℃ for thawing after weighing the mass and the height of the sample, taking out the sample after thawing for 8 hours, wiping off the surface moisture, and weighing the mass and the height of the sample;
repeating the operation for 10 times to obtain the mass change rate of the test piece after 10 times of freeze thawing cycles;
Carrying out a uniaxial compression test on the water stable material sample after freeze thawing, and obtaining a stress strain curve of the water stable material sample after freeze thawing;
Acquiring the uniaxial compressive strength of the water stable material sample after freeze thawing, and obtaining the average strength of the water stable material sample after freeze thawing;
calculating the compressive strength loss of the frozen and thawed sample according to the uniaxial compressive strength of the water stable material sample which is not frozen and thawed in the step 2;
And obtaining an evaluation conclusion of the water stable material by comparing the average strength of the water stable material samples before and after freeze thawing and the compressive strength loss of the samples after freeze thawing.
Compared with the prior art, the invention has the following advantages and beneficial effects:
The invention relates to a slag water stabilizing material proportion of basalt fiber doped externally and an evaluation method thereof, wherein the generation of cracks can be inhibited by adding fibers and changing the cement doping amount.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments 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 principles of the application. In the drawings:
FIG. 1 (a) is a bar graph of mass change and mass change rate plot of a second set-1;
FIG. 1 (b) is a bar graph of mass change and mass change rate plot for the second set-2;
FIG. 1 (c) is a bar graph of mass change and mass change rate plot for the second set-3;
FIG. 2 (a) is a bar graph of mass change and mass change rate plot for the first set-1;
FIG. 2 (b) is a bar graph of mass change and mass change rate plot for the first set-2;
FIG. 2 (c) is a bar graph of mass change and mass change rate plot for the first set-3;
FIG. 3 is a schematic view of a placement device;
FIG. 4 is a schematic view of the first connecting pouch 4 and the second connecting pouch 5 on one side of the placement device after zipper attachment;
FIG. 5 is a schematic view of the weighing structure for measuring height;
FIG. 6 is a schematic view of a shortened construction of the telescopic tape;
FIG. 7 is a schematic view of a placement block arranged on a bracket;
FIG. 8 is a schematic view of a placement block configuration;
fig. 9 is a schematic view of the structure in which the placing plate is directly taken out of the bracket by moving upward.
In the drawings, the reference numerals and corresponding part names:
1-bracket, 2-placing plate, 3-flexible tape measure, 31-taking end, 4-first connecting bag, 5-second connecting bag, 6-zipper, 7-hidden button, 8-fixed block, 9-placing groove and 10-spring.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings for the purpose of making the objects, technical solutions and advantages of the present invention more apparent, but the present invention is not limited to the scope of the examples. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
Example 1
The waste slag water stabilizing material proportion of the externally doped basalt fiber comprises cement, coarse aggregate, fine aggregate, basalt fiber and water, wherein the coarse aggregate is gravel aggregate with the weight part ratio of 4.75-26.5mm and continuous graded broken stone with the weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm is 13-18:30-40:22-26; the fine aggregate is tunnel waste slag, the tunnel waste slag comprises coarse sand and fine sand, and the weight ratio of the coarse sand to the fine sand is 10-15:12-16. The weight ratio of the cement to the basalt fiber is 3-8:0.5-1. The weight ratio of the cement to the coarse aggregate to the fine aggregate to the basalt fiber to the water is 3-8:110-150:110-150:0.5-1:2-10.
In some embodiments, the basalt fiber has a length of 12 mm.
The weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm in the coarse aggregate is 16:34:24.
The weight ratio of the coarse sand to the fine sand is 12:14.
The weight ratio of the cement to the basalt fiber is 5:0.7.
The evaluation method of the waste slag water stable material externally doped with basalt fibers comprises the following steps:
Step 1, carrying out a uniaxial compression test on a water stable material sample to obtain a stress strain curve of the water stable material sample;
step 2, calculating the uniaxial compressive strength of the water stable material sample according to the stress-strain curve to obtain the average strength of the water stable material sample;
step 3, carrying out splitting test on the water stable material sample, curing 180 d on the water stable material sample, taking the water stable material sample out of a curing box one day before the test, soaking the water stable material sample in water, wiping surface moisture before the test, and measuring the height of a test piece; placing a water stable material sample in the center of a press head of a press for testing, wherein the loading speed is 1 mm/min, and obtaining the indirect tensile strength of the water stable material sample;
Step 4, placing the water stable material sample into a constant temperature and humidity curing box for curing, taking out the water stable material sample after curing 180 d, accurately weighing the quality, the height and the diameter of the water stable material sample, soaking the water stable material sample in water, taking out the water stable material sample after soaking 24: 24 h, wiping off surface moisture, and weighing the quality and the height of the water stable material sample; placing the water stable material sample into a freezing and thawing test box, wherein the freezing temperature is-18 ℃ and the freezing time is 16 h; after freezing, taking out the sample, immediately placing the sample into a constant temperature water tank at 20 ℃ for thawing after weighing the mass and the height of the sample, taking out the sample after thawing for 8 hours, wiping off the surface moisture, and weighing the mass and the height of the sample; repeating the operation for 10 times to obtain the mass change rate of the test piece after 10 times of freeze thawing cycles; carrying out a uniaxial compression test on the water stable material sample after freeze thawing, and obtaining a stress strain curve of the water stable material sample after freeze thawing;
Acquiring the uniaxial compressive strength of the water stable material sample after freeze thawing, and obtaining the average strength of the water stable material sample after freeze thawing;
calculating the compressive strength loss of the frozen and thawed sample according to the uniaxial compressive strength of the water stable material sample which is not frozen and thawed in the step 2;
And obtaining an evaluation conclusion of the water stable material by comparing the average strength of the water stable material samples before and after freeze thawing and the compressive strength loss of the samples after freeze thawing.
Specifically, the evaluation conclusion in this example was obtained by comparing the average strength and indirect tensile strength of the water stable material sample with those of the conventional general water stable material sample.
The method is characterized in that the performance of a sample is obtained by the method, the water stable material sample is compared with the performance of the existing general water stable material sample, the evaluation result of the water stable material sample is obtained, the evaluation result comprises good and bad, and when the performance is better than the performance of the general water stable material sample, the evaluation result of the water stable material sample is good; when the performance is inferior to that of a general water stable material sample, the evaluation result of the water stable material sample is inferior.
Example 2
In the embodiment, the water stable material sample is compared with a common sample without basalt fiber, so that an evaluation conclusion of the water stable material sample is obtained.
The coarse aggregate and the cement are gravel aggregate and cement practically used in a construction site, and the fine aggregate is tunnel waste slag, wherein the coarse aggregate is gravel aggregate with 4.75-26.5mm continuous grading, and the weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm is 16:34:24; the fine aggregate is tunnel waste slag, the tunnel waste slag comprises coarse sand and fine sand, and the weight ratio of the coarse sand to the fine sand is 12:14. The weight ratio of the cement to the basalt fiber is 5:0.7. The fiber is basalt fiber produced by Hunan Changsha lemon auspicious building material Co-Ltd, and the main chemical components of the fiber are silicon dioxide, aluminum oxide, calcium oxide, magnesium oxide and ferric oxide, and the length of the basalt fiber is 12 mm.
Sample preparation is carried out according to the indexes, wherein the first group is a control group without basalt fiber, the second group is a control group with basalt fiber added with 0.7%, the sample is cured to 180 d, a uniaxial compression test, a splitting test and a freeze thawing cycle test are respectively carried out after curing, and the influence of externally doped fibers on the water stabilizing property is explored.
(1) Uniaxial compression test
And (3) carrying out uniaxial compression test on the sample by using a YAW-2000 electrohydraulic servo pressure tester, observing the surface cracks of the sample, and finding that the two groups of sample cracks are expanded along the axial direction and the whole is expressed as axial splitting damage. For the second group of water-stabilized material samples with externally doped fibers, only some small pieces at the corners fall off after being destroyed, and the water-stabilized material samples can still keep the basic form after being moved down on a press, while the first group of water-stabilized material samples fall off along the corners or in the middle after being destroyed, and are immediately broken into loose stacked bodies after being moved down from the press. The morphology analysis shows that the addition of the fiber can effectively improve the ductility of the water stabilizing material.
From the microscopic aspect, the fibers are distributed in the water-stable material sample in an unordered manner, and when the crack is expanded, the connection effect of the fibers at two ends of the crack can effectively inhibit the expansion of the crack, so that the sample is complete in form after being damaged.
And processing the original data, and drawing a stress-strain curve of a second group of water stable material samples and a stress-strain curve of a first group of water stable material samples.
The elastic modulus of the water stable materials is calculated by using the linear elastic stage, the average elastic modulus of the water stable materials is 715.97 MPa for the second group of water stable materials, and the elastic modulus of the water stable materials is 789.63 MPa for the first group of water stable materials. It is known that the incorporation of the fiber can effectively reduce the elastic modulus of the water-stable material, and the water-stable material is easily cracked due to the excessive elastic modulus, so that the durability of the water-stable material can be improved by adding the fiber.
After the water stable materials are damaged, the stress-strain curve is observed, and the second group of water stable materials have better ductility in the rear section of the peak, wherein the bearing capacity of the second group of water stable materials is slower than that of the first group of water stable materials.
The uniaxial compressive strength of the water-stabilized materials is calculated according to the stress-strain curve, the average strength of the water-stabilized materials in the second group is 6.97 MPa, the average strength of the water-stabilized materials in the first group is 7.08 MPa, the compressive strength of the water-stabilized materials after the fibers are externally doped is not obviously improved, the analysis causes the phenomenon to be possibly related to experimental errors caused by sample preparation defects, and secondly, after the fibers are added, part of fibers cannot be fully wrapped by cement due to the fact that the water-stabilized materials are low in cement doping amount, the reinforcing effect cannot be achieved, the connection between the coarse and fine aggregate of the water-stabilized materials and the cement is affected, and the water-stabilized materials strength is slightly reduced.
(2) Crack resistance
The splitting test is to change the pressure transmitted by a press machine into linear load through a die or a cushion block pressing bar, so that the tensile stress perpendicular to the acting direction of the upper load and the lower load is generated inside the sample, and the sample is damaged.
And (3) carrying out cleavage test on the water stable material sample by adopting a YAW-2000 electrohydraulic servo pressure tester. And curing the water stable material sample 180 d after sample preparation, taking the water stable material sample out of the curing box one day before testing, soaking the water stable material sample in water, wiping surface moisture before testing, and accurately measuring the height h of the test piece to be 0.1mm. The test process is to directly place the sample in the center of the press head for testing without using a pressing bar, and the loading speed is 1 mm/min.
After the water stable material sample has obvious cracks or is split into two parts directly, the test is finished, the test results are recorded, and the test results are shown in table 1.
Table 1 data recording table for cleavage test
Without the bead, the indirect tensile strength was calculated: ri=2p/pi dh
Wherein Ri is indirect tensile strength of the water stable material and MPa; p is the maximum pressure when the test piece is damaged, N; d is the diameter of the test piece, mm; h is the height of the test piece after soaking in water, and mm.
The average indirect tensile strength of the second group of water stabilization samples is calculated to be 0.374 MPa, and the average indirect tensile strength of the first group of water stabilization samples is calculated to be 0.337, 0.337 MPa. Compared with the indirect tensile strength of the waste slag water stable material without adding the basalt fiber, the indirect tensile strength of the waste slag water stable material with the basalt fiber is improved by about 11%, and the addition of the fiber can effectively improve the indirect tensile strength of the water stable material and can better improve the anti-cracking performance of the water stable material.
(3) Water stable material freezing resistance
The freeze thawing test equipment is a GWGS-40 programmable constant temperature and humidity test box manufactured by Beijing Shen Kewei Jie instruments and equipment limited company. And (3) placing the prepared sample into a constant temperature and humidity curing box for curing, taking out the sample after curing 180 d, accurately weighing the quality, the height and the diameter of the sample, and soaking the sample in water to ensure that the water surface is about 2.5 cm higher than the top surface of the sample. After soaking 24 h, taking out the product from the water, wiping off the surface moisture, and weighing the product in terms of quality and height. And then placing the sample into a freeze-thawing test box, wherein the freezing temperature is-18 ℃, the freezing time is 16h, and at least 20 mm gaps are reserved around the sample, so that the circulation of cold air is facilitated. And after the freezing is finished, taking out the sample, weighing the mass and the height of the sample, and immediately putting the sample into a constant-temperature water tank at 20 ℃ for thawing for 8 hours. And after the melting is finished, taking out the sample, wiping off surface moisture, weighing the mass and the height to obtain a freeze thawing cycle, and then placing the sample into an incubator for a second cycle.
According to the test procedure of inorganic binder stabilizing materials for highway engineering (JTG E51-2009), a test piece for curing 180 d needs to be frozen and thawed 10 times. The mass of the sample after each freeze thawing was recorded, and the test results are shown in table 2.
Table 2 water stable material freezing and thawing test record table
The mass change rate of the sample is calculated,Wherein Wn is the mass change rate of the test piece after n times of freeze thawing cycles,%; m 0 is the mass of the test piece before freeze thawing cycle, g; m n is the mass of the test piece after n freeze-thawing cycles, g.
TABLE 3 rate of change of freeze thawing quality of water stable materials
Drawing a histogram of the quality change of the water-stable material sample and a quality change rate line graph by using the data in tables 2 and 3, wherein the histogram of the quality change of the water-stable material of the second group and the quality change rate line graph are shown in fig. 1, and the histogram of the quality change of the water-stable material of the first group and the quality change rate line graph are shown in fig. 2; as can be seen from fig. 1 and 2, the mass of the added fiber or the common water stabilizing material basically changes less during the first 5 freeze-thawing cycles, the mass change rate is lower, and the mass change is relatively larger during the last 5 freeze-thawing cycles, and the mass change rate is relatively higher. The analysis may cause this phenomenon because freeze thawing causes less deterioration of the water stable material during the first 5 freeze thawing cycles and the accumulated deterioration degree is large during the second 5 freeze thawing cycles, thus causing a relatively large mass change.
Meanwhile, the changes of the quality and the quality change rate of the two types of water stabilizing materials are observed, and the fact that the quality of the water stabilizing materials is increased relative to the initial value or the quality after the previous freezing and thawing after some times of freezing and thawing is found, and the quality change rate is not simply increased or reduced, but is fluctuated. The analysis reasons may be that the water stable material sample is formed by static pressure, so that a plurality of gaps exist in the water stable material sample, wherein a part of gaps are in a closed state due to the wrapping of cement paste, after the cement paste is subjected to freeze thawing, certain damage occurs in the sample, the damage can just enable the closed gaps to be opened, and the opened gaps absorb water, so that the quality is not degraded, the quality change rate is increased, and fluctuation occurs.
And calculating the average value of the mass change rate of the water stabilizing material after 10 times of freeze thawing, wherein the average mass change rate of the water stabilizing material of the externally doped fiber waste slag is 0.095%, and the average mass change rate of the waste slag water stabilizing material is 0.136%. It is known that the quality loss is lower after 10 times of freeze thawing cycles, and the quality change rate is smaller, so that the waste slag water stabilizing material has better freezing resistance in the aspect of quality change indexes. After the fiber is added, the quality change rate of the waste slag water stabilizing material is lower than that of the waste slag water stabilizing material without the fiber, which indicates that the addition of the fiber can inhibit the quality loss of the waste slag water stabilizing material and improve the freezing resistance of the waste slag water stabilizing material.
(4) Carrying out uniaxial compression test on the water stable material sample after freeze thawing
Measuring the single-axis compressive strength of the water stable material after freeze thawing, and calculating the compressive strength loss of the test piece after freeze thawing by combining the single-axis compressive strength of the unfrozen water stable material: BDR= (R DC×100）/RC, wherein BDR is the compressive strength of the test piece after n times of freeze thawing cycles, R DC is the compressive strength of the test piece after n times of freeze thawing cycles, MPa, and R C is the compressive strength of the test piece without freeze thawing, MPa.
The second group of water stable materials after freeze thawing was measured to have an average compressive strength of 6.76, MPa, a compressive strength before freeze thawing of 6.97, MPa and a compressive strength remaining of 96.99%. The first set of water stable materials had an average compressive strength of 6.25 MPa after freeze thawing, a compressive strength of 7.08 MPa before freeze thawing, and a compressive strength remaining of 88.28%. The compressive strength residual rate of the second group of water stable materials is higher than that of the first group of water stable materials, which indicates that the addition of the fiber can effectively resist freeze thawing damage and can better improve the freezing resistance of the water stable materials.
Drawing a stress-strain curve of a water stable material sample after freeze thawing, and calculating the elastic modulus of the water stable material, wherein the average elastic modulus of the water stable material of the second group is 512.16 MPa, and compared with the water stable material of the second group before freeze thawing, the average elastic modulus of the water stable material of the second group is 715.97 MPa, and the reduction rate of the water stable material of the second group is 28.47%; the average elastic modulus of the first group of water stabilizing materials after freeze thawing is 494.17 MPa, and compared with the first group of water stabilizing materials without freeze thawing, the elastic modulus of the first group of water stabilizing materials is 789.63 MPa, and the drop rate is 37.42%. It is known that the freezing and thawing cycle effect can reduce the elastic modulus of the water-stable material, and the addition of basalt fiber can effectively inhibit the trend.
In summary, the evaluation result of the water stable material sample of the present invention is good.
Example 3
On the basis of the embodiment, when the freeze thawing test is carried out, the invention further comprises a placing device, as shown in fig. 3, the placing device comprises a bracket 1, a plurality of placing plates 2 are sequentially placed on the bracket 1 from top to bottom, and when the freeze thawing test is carried out, the placing device is placed in a freeze thawing test box, and a sample is placed on the placing plates. Compared with the existing structure, the device can directly take out a plurality of samples from the freeze thawing test box through the placement device, does not need to take one by one, and is more convenient to operate.
The side of the placing plate 2 at the uppermost part is provided with a first connecting bag 4 which can be wrapped, the first connecting bag 4 is provided with a plurality of small through holes, the small through holes are used for introducing defrosting water, and meanwhile, the sample cannot flow out through the small through holes. The side of the bracket 1 is provided with a second connecting bag 5, and the first connecting bag 4 is connected with the second connecting bag 5 through a zipper 6. After the first connecting bag 4 and the second connecting bag 5 are connected through the zipper 6, as shown in fig. 8, the upper end face, the lower end face and the four side faces of the placement device are sealed into a rectangular cavity, and after the zipper is connected, the first connecting bag 4 and the second connecting bag 5 are in a schematic view on one side face of the placement device, as shown in fig. 4. When not in use, the zipper 6 is opened and the first connecting bag is wrapped up to facilitate the removal of the sample. Preferably, a plurality of hidden buttons 7 are arranged on the first connecting bag 4, corresponding female buttons are arranged on the side face of the placing plate 2, and when the first connecting bag 4 is connected with the second connecting bag 5 through a zipper, the hidden buttons on the first connecting bag 4 are connected with the female buttons on the side face of the placing plate, so that the use efficiency is improved.
Meanwhile, after the sample is taken out of the freeze thawing test box, the placing device can be directly placed in a water tank for thawing.
Further, as shown in fig. 5, a plurality of weighing structures are arranged on the placing plate 2, each weighing structure comprises a telescopic tape 3 and a taking end 31, one end of the telescopic tape 3 is connected with the placing plate 2, the taking end 31 is connected with the other end of the telescopic tape 3, when the height of a sample is required to be measured, the sample is placed beside the telescopic tape, an operator drives the taking end to move upwards, and then the height of the sample is measured through the telescopic tape 3. When measurement is not required, the telescopic tape 3 is shortened, as shown in fig. 6, and the pick-up end 31 is brought into contact with the placing plate 2.
Still further, as shown in fig. 7, a placing block 7 for supporting the placing plate 2 is provided on the bracket 1, as shown in fig. 8, one end of the placing block 7 is provided with an acting surface, the other end of the placing block 7 is provided with a fixing block 8, the side surface of the placing block is provided with a spring 10, a placing groove 9 is provided on the bracket 1, the placing block 7 is placed in the placing groove 9, in an original state, one end of the placing block with the acting surface is positioned on one side close to the placing plate, the fixing block 8 is positioned on the other side of the bracket, and a spring groove is provided at the placing groove of the bracket and used for placing the spring 10.
When the placing plate needs to be taken down, the placing plate 2 is moved upwards, when the placing plate below acts on the acting surface of the placing block 7, the springs 10 are compressed, the placing block 7 moves in the placing groove towards the direction of the fixed block, and as shown in fig. 9, the placing plate moves upwards without shielding of the placing block and is directly taken out from the bracket. After taking out, under the action of the placing plate, the spring electric placing block moves in the placing groove and returns to a state of supporting the placing plate.
When the placing plate needs to be placed, an operator acts on the fixed block 8 to pull the placing block towards the direction of the fixed block, and the acting surface of the placing block is completely positioned in the placing groove. The placement plate is then moved through the rack and placed on the corresponding placement block.
The foregoing description of the embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (10)
1. The waste slag water stabilizing material proportion of the externally doped basalt fiber is characterized by comprising cement, coarse aggregate, fine aggregate, basalt fiber and water, wherein the coarse aggregate is gravel with 4.75-26.5mm continuous grading, and the weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm is 13-18:30-40:22-26; the fine aggregate is tunnel waste slag, the tunnel waste slag comprises coarse sand and fine sand, and the weight ratio of the coarse sand to the fine sand is 10-15:12-16.
2. The waste slag water stabilizing ratio of externally doped basalt fiber according to claim 1, wherein the length of the basalt fiber is 12 mm.
3. The waste slag water stabilizing ratio of the externally doped basalt fiber according to claim 1, wherein the weight ratio of cement to basalt fiber is 3-8:0.5-1.
4. The waste slag water stabilizing ratio of the externally doped basalt fiber according to claim 1, wherein the weight part ratio of 4.75-9.5mm, 9.5-19mm and 19-26.5mm in coarse aggregate is 16:34:24.
5. The waste slag water stabilizing ratio of the externally doped basalt fiber according to claim 1, wherein the weight ratio of coarse sand to fine sand is 12:14.
6. The waste slag water stabilizing ratio of the externally doped basalt fiber according to claim 3, wherein the weight ratio of cement to basalt fiber is 5:0.7.
7. The evaluation method of the waste slag water stable material externally doped with basalt fibers is characterized by comprising the following steps of:
Step 1, carrying out a uniaxial compression test on a water stable material sample to obtain a stress strain curve of the water stable material sample;
step 2, calculating the uniaxial compressive strength of the water stable material sample according to the stress-strain curve to obtain the average strength of the water stable material sample;
step 3, carrying out cleavage test on the water stable material sample to obtain indirect tensile strength of the water stable material sample;
and step 4, obtaining an evaluation conclusion of the water stable material sample according to the average strength and the indirect tensile strength.
8. The method for evaluating the stable waste slag water with basalt fibers doped outside according to claim 7, further comprising:
placing a water stable material sample into a constant temperature and humidity curing box for curing, taking out the water stable material sample after curing 180 d, accurately weighing the quality, the height and the diameter of the water stable material sample, soaking the water stable material sample in water, taking out the water stable material sample after soaking 24: 24 h, wiping off surface moisture, and weighing the quality and the height of the water stable material sample;
Placing the water stable material sample into a freezing and thawing test box, wherein the freezing temperature is-18 ℃ and the freezing time is 16 h; after freezing, taking out the sample, immediately placing the sample into a constant temperature water tank at 20 ℃ for thawing after weighing the mass and the height of the sample, taking out the sample after thawing for 8 hours, wiping off the surface moisture, and weighing the mass and the height of the sample;
repeating the above operation for 10 times, and obtaining the mass change rate of the test piece after 10 times of freeze thawing cycles.
9. The method for evaluating the stable waste slag water with basalt fibers doped outside according to claim 8, further comprising:
Carrying out a uniaxial compression test on the water stable material sample after freeze thawing, and obtaining a stress strain curve of the water stable material sample after freeze thawing;
Acquiring the uniaxial compressive strength of the water stable material sample after freeze thawing, and obtaining the average strength of the water stable material sample after freeze thawing;
calculating the compressive strength loss of the frozen and thawed sample according to the uniaxial compressive strength of the water stable material sample which is not frozen and thawed in the step 2;
And obtaining an evaluation conclusion of the water stable material by comparing the average strength of the water stable material samples before and after freeze thawing and the compressive strength loss of the samples after freeze thawing.
10. The method for evaluating the stable waste slag water material externally doped with basalt fibers according to claim 7, wherein the method is characterized in that,
In the step 3, curing the water stable material sample 180 d, taking the water stable material sample out of a curing box one day before testing, soaking the water stable material sample in water, wiping surface moisture before testing, and measuring the height of a test piece; and (3) placing the water stable material sample in the center of a press head for testing, wherein the loading speed is 1 mm/min, and obtaining the indirect tensile strength of the water stable material sample.
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