CN108844822A - A method of for detecting chopped strand alkaline resistance properties - Google Patents
A method of for detecting chopped strand alkaline resistance properties Download PDFInfo
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- CN108844822A CN108844822A CN201810612960.1A CN201810612960A CN108844822A CN 108844822 A CN108844822 A CN 108844822A CN 201810612960 A CN201810612960 A CN 201810612960A CN 108844822 A CN108844822 A CN 108844822A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
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Abstract
The invention discloses a kind of methods for detecting chopped strand alkaline resistance properties, belong to fiber for cement concrete strength test test method technical field.Chopped strand sample to be detected is subjected to particular procedure on accelerated ageing test piece mould；Molding sample is handled by quick aging method, stretching sample is made；Tension test is carried out using tensile load loading method；Test sample is comprehensively evaluated according to the alkaline resistance properties appraisement system.Detection method of the present invention is simple, and accuracy is high, and detects also more reasonable for the chopped strand alkaline resistance properties in practical engineering application.
Description
Technical field
The present invention relates to fiber for cement concrete strength test test method technologies, and in particular to one kind is short for detecting
The method for cutting fiber alkaline resistance properties.
Background technique
Fiber concrete has high-strength characteristic, high durable compared to normal concrete, ocean engineering, railway tunnel,
Assembled integrated wallboard etc. has a extensive future.
However, lacking the really applicable method and mark for detecting its alkaline resistance properties for chopped strand at home at present
Standard, especially be chopped this kind of inorfil of boundling glass fibre almost without.External more representational standard is such as：prEN
14649：2004(E)《Test method (the SIC of glass fibre strength-retention in precast concrete product-cement and concrete
TEST)》, but this standard only illustrates the detection method and existing defects of long filament.In addition, short glass fiber is alkaline-resisting
Performance has differences, glass fibre be all in practical engineering applications by be chopped in the form of based on, industrial production come out glass fibers
Mostly based on the glass fibre under filament state, filament state has difficulties dimension with the glass fibre conversion under chopped state, and
The performance of glass fibre and the performance of glass fibre under chopped state have differences under filament state, only obtain under filament state
Glass fibre performance be that can not effectively react the truth of short glass fiber.In addition, can consulting lot of documents
With discovery, the alkaline resistance properties tests of other chopped strands there is also it is similar can be unreasonable according to or there are detection method without specification
The case where.
The Committee of Development and Reform, the Ministry of Finance, Ministry of Industry and Information, which combine, to print and distribute《Critical material upgrading engineering construction scheme》It proposes, to push away
The emphasis green wood that the industry developments such as dynamic generation information technology, energy conservation and environmental protection, ocean engineering and advanced railway transportation equipment are badly in need of
Material realizes batch steady production and sizable application；Emphasis supports the crucial green wood gauge of huge, the domestic still category blank of potential of demand
Mould stablizes industrialization and Demonstration Application；Meanwhile promoting part backward in technique or being unable to the emphasis new material of steady production reality as early as possible
Existing technology upgrading and batch stablize industrialization and sizable application.And the alkaline resistance properties of chopped strand lacks scientific system both at home and abroad at present
The detection of system and assessment method, therefore, we urgently need the detection method to chopped strand alkaline resistance properties to be sought simultaneously
Make its standardization.
Summary of the invention
It is an object of the present invention to provide a kind of methods for detecting chopped strand alkaline resistance properties.
The technical solution for realizing the aim of the invention is as follows：A method of it, will for detecting chopped strand alkaline resistance properties
Chopped strand sample to be detected carries out particular procedure on accelerated ageing test piece mould；Molding sample is passed through into accelerated ageing side
Method processing, is made stretching sample；Tension test is carried out using tensile load loading method；Body is evaluated according to the alkaline resistance properties
System comprehensively evaluates test sample.
It specifically comprises the following steps：
(1) spacer is passed through into chopped strand, every chopped strand two sides wear one；Water permeable membrane is uniformly laid on
The intermediate test position of chopped strand simultaneously stirs spacer and blocks water permeable membrane；
(2) cementitious material is poured in the intermediate test position of step (1) described fiber, forms the exposed fibre in both ends after conserving
Dimension, the structure of centre package square cement mortar specimen；
(3) position that fiber in step (2) described structure is connect with cement mortar block, using high temperature resistant interleaving agent into
Row package processing, it is ensured that the inner space of coupling part be in closed state, after place it in the closed container for containing distilled water,
On distilled water liquid level be more than test specimen upper surface, the container is placed in 80 ± 1 DEG C of constant water bath box place 96 ± 1 hours into
Row accelerated ageing processing；
(4) sample is taken out, the cement mortar block of package and chopped strand are removed, and remove the resistance to height coated on fiber
Warm interleaving agent, is placed in the closed container for containing distilled water, impregnates 24 ± 1 hours；
(5) it takes out, is placed at 50 ± 5 DEG C 60 ± 5 minutes dry；
(6) random in above-mentioned steps treated chopped strand and untreated chopped strand each to choose at least 10
Root, and it is denoted as S1 and S2 respectively as experimental group in fiber both ends setting fixing end, it is ensured that the fibre of part of detecting among sample
It ties up length and is equal to 10 ± 1mm；
(7) tension test is carried out to S1 and S2 respectively, records maximum strength value when each sample destroys；
(8) strength average value, standard deviation and the coefficient of variation of non-S1 and S2 are calculated separately；
(9) if the coefficient of variation of S1 or/and S2 is more than 14%, test specimen is chosen again, and repeats step (6) to step
Suddenly (8)；
(10) the tensile strength loss late of sample is calculated by formula
In formula：
The average value of-S1 (reset condition sample) ultimate strength value, unit N；
The average value of-S2 (accelerated ageing processing sample) ultimate strength value, unit N；
C- tensile strength loss late, %.
Further, in step (2), the cementitious material is grouped as by following group：75 parts by weight of cement, normal sand 25
32 parts by weight of parts by weight and distilled water.
Further, in step (2), gelling material is poured using intermediate test position of the mold to step (1) described fiber
Material, wherein the mold includes pedestal, the first crosspiece, the second crosspiece, limited block；First crosspiece and the second crosspiece are arranged in parallel
On pedestal, several limiting slots of placement location limited block, the limit are all provided on first crosspiece and the second crosspiece
Slot is symmetrical arranged, and the first crosspiece and the second crosspiece and limited block collectively form mutually indepedent and mutual disconnected square cavity, the
One crosspiece and the second crosspiece include upper layer and lower layer structure, and in limiting slot side, the first crosspiece and the second crosspiece are connect with pedestal
Understructure on, the card slot parallel with limiting slot side is set.
Further, chopped strand includes the crude fibre of bundle and diameter greater than 0.3mm that is chopped, wherein be chopped collection
Bundle fiber includes be chopped boundling glass fibre, the boundling basalt fibre that is chopped, chopped boundling synthetic fibers and chopped boundling carbon fiber
Dimension.
Further, in step (2), the size of square cement mortar specimen is 10 ± 1mm*10 ± 1mm*10 ± 1mm.
Further, in step (3), high temperature resistant interleaving agent uses butter.
Further, in step (3), liquid level is more than 5 ± 0.5cm of test specimen upper surface on distilled water.
Further, in step (4), using the high temperature resistant interleaving agent coated on the method removal fiber of wiping.
Further, in step (6), fixing end is arranged to fiber both ends by adhesive sheet and fiber binder, wherein position
In fibre length >=10mm of fixing end.
Further, in step (7), the fixing end of sample to be tested in S1 and S2 is clamped in the narrow orifice of cupping machine
In, start cupping machine, until sample destroys, record maximum strength when each sample destroys, wherein tensile speed is
1mm/min。
Further, in step (8), with formulaCalculate the strength average value of sample；With formulaCalculate the standard deviation of sample；With formulaCalculate sample
The coefficient of variation, in formula：Represent the average value of S1 or S2 ultimate strength value, unit N；xiRepresent the fracture of i sample in S1 or S2
Strength is worth, unit N；N represents the number of sample, n=10；I represents the serial number of sample；S represents the standard deviation of S1 or S2；Cv generation
The coefficient of variation of table S1 or S2.
Compared with prior art, the present invention its significant advantage is：Detection method of the present invention is simple, and accuracy is high,
And more reasonable is detected also for the chopped strand alkaline resistance properties in practical engineering application.
Detailed description of the invention
Fig. 1 is the top view of accelerated ageing test piece mould structure of the present invention.
Fig. 2 is the main view (A) and rearview (B) of accelerated ageing test piece mould structure of the present invention.
Fig. 3 is the partial sectional view of accelerated ageing test piece mould structure of the present invention.
Fig. 4 is joints cement mortar of the present invention before to chopped strand treated test specimen structural schematic diagram.
Fig. 5 is accelerated ageing shaping test piece structural schematic diagram of the present invention.
Fig. 6 is the structural schematic diagram of accelerated ageing test specimen after package of the present invention processing.
Fig. 7 is the structural schematic diagram of tensile test specimen.
1 pedestal, 2 first crosspieces, 3 second crosspieces, 4 limited blocks, 5 cement mortar blocks；It is 6 chopped strands, 7 water permeable membranes, 8 resistance to
High temperature separation layer, 9 fixing ends, 10 square cavities, 11 spacers, 12 card slots, the first top rail of 2-1, the first bottom rail of 2-2,3-1
Second top rail, the second bottom rail of 3-2.
Specific embodiment
In order to illustrate technical solution of the present invention and goal of the invention, with reference to the accompanying drawing and specific embodiment is the present invention
It is further to introduce.
In conjunction with Fig. 1 to Fig. 3, accelerated ageing test piece mould of the invention, including pedestal 1, the first crosspiece 2, the second crosspiece 3,
Limited block 4；First crosspiece 2 and the second crosspiece 3 are arranged on pedestal 1, are respectively provided on first crosspiece 2 and the second crosspiece 3
Can holding limit block 4 several limiting slots, the limiting slot is symmetrical arranged, the first crosspiece 2 and the second crosspiece 3 and limited block
4 collectively form mutually indepedent and mutual disconnected square cavity 10, and the first crosspiece 2 and the second crosspiece 3 include upper layer and lower layer knot
Structure, in limiting slot side, in the understructure that the first crosspiece 2 and the second crosspiece 3 are connect with pedestal 1, setting and limiting slot side
Parallel card slot 12.
In conjunction with Fig. 2 to Fig. 3, the first crosspiece 2 includes the first top rail 2-1 and the first bottom rail 2-2, the second crosspiece 3 include
Second top rail 3-1 and the second bottom rail 3-2, the first bottom rail 2-2 and the second bottom rail 3-2 with pass through positioning bolt or screw
It is connect with pedestal 1, card slot 12 is set on the first bottom rail 2-2 and the second bottom rail 3-2, the card slot 12 is arranged in limiting slot one
Side, and it is parallel with limiting slot side, the first top rail 2-1 is connect by positioning bolt or buckle with the first bottom rail 2-2, and second
Top rail 3-1 is connect by positioning bolt or buckle with the second bottom rail 3-2, and the both ends of test specimen are placed in card slot 12, test specimen
Intermediate test position is placed in square cavity 10.
In conjunction with Fig. 4, using accelerated ageing test piece mould to chopped strand joints cement mortar before, reply chopped strand into
Row processing, structure that treated and its treatment process are as follows：Spacer 11 is passed through into chopped strand 6, every chopped strand two
Respectively wear one in side；Water permeable membrane 7 is uniformly laid on the intermediate test position of chopped strand 6 and stir spacer 11 block it is permeable
Film 7,7 region of water permeable membrane are the test position of test specimen.
Specific gelling material will be used in the square cavity 10 (pouring storehouse) of test specimen as shown in Figure 4 mold shown in Fig. 1
Material pours it, is taken out to get accelerated ageing shaping test piece as shown in Figure 5 is arrived, i.e., in chopped strand 6 after conserving
Between the region of test position (length be 10 ± 1mm) namely where water permeable membrane 7 wrapped up by rectangular cement mortar block 5, water
The size of cement mortar test block 5 is 10 ± 1mm*10 ± 1mm*10 ± 1mm.
In conjunction with Fig. 6, test specimen as shown in Figure 5 is sealed processing before carrying out accelerated aging test, that is, uses resistance to height
Warm interleaving agent carries out closed cladding processing to the part that chopped strand 6 is connect with cement mortar block 5, in chopped strand 6 and water
The part that cement mortar test block 5 connects forms high temperature resistant separation layer, it is ensured that the inner space of coupling part is in closed state, mesh
Be to ensure that the inside alkali ion will not infiltrate.
In conjunction with Fig. 7, cement mortar block will be removed through the processed test specimen of high temperature resistant interleaving agent accelerated aging process again
The chopped strand that accelerated ageing is obtained after 5, by the chopped strand of accelerated ageing and the chopped strand of original state respectively randomly select to
Few 10, fixing end 9 is arranged with bonding sheet respectively in both ends, it is ensured that among sample the fibre length of part of detecting be equal to 10 ±
1mm is denoted as S to get test block as shown in Figure 7 respectively2(accelerated aging test group) and S1 (blank test group).
By S2(accelerated ageing) and S1(blank) carries out tension test test, the sample of detection its maximal destruction strength respectively
Will be between the 20%~80% of the maximum range of cupping machine used, tensile speed takes 1mm/min.
When certain cause specifics or fiber protection existing defects, non-accelerated ageing region (i.e. fixing end 9) occurs disconnected
It splits, when this occurs, test result is invalid.Test result retains 2 decimals.
Testing procedure and calculating process are as follows：
(1) strength average value, standard deviation and the coefficient of variation of non-S1 and S2 are calculated separately；
(2) if the coefficient of variation of S1 or/and S2 is more than 14%, test specimen is chosen again；；
(3) the tensile strength loss late of sample is calculated by public formula (IV).
In formula：
The average value of-S1 (reset condition sample) ultimate strength value, unit N；
The average value of-S2 (accelerated ageing processing sample) ultimate strength value, unit N；
C- tensile strength loss late, %.
(4) show that product to be measured can be used for having as tensile strength loss late C < 20% through a large number of experiments and actually
In the cement concrete engineering that alkaline resistance properties requires.
Case study on implementation 1：By taking short glass fiber as an example
(1) test prepares：
I. (specification, the geometrical characteristic of selected sample are roughly the same) is sampled to sample to be detected；
II. in the pedestal 1 of accelerated ageing sample mold, limited block 4 and all with cementitious material (cement mortar)
Coat lubricating oil in the part of contact；
III. prepare cement mortar raw material, weigh cement, sand, distilled water, concrete component composition is as follows：
Standard cement： 75g
Normal sand： 25g
Distilled water： 32g
IV. the stirring blade of mortar mixer, filling shovel, material pot are soaked with distilled water, material pot is fallen after wetting
Button is placed.
(2) accelerated ageing sample makes：
I. the first bottom rail 2-2 and the second bottom rail 3-2 are fixed by bolts on pedestal 1；
II. spacer 11 passes through chopped strand 6 (this implementation uses alkaline-resisting short glass fiber), every chopped strand two sides
Respectively wear one；Water permeable membrane 7 is uniformly laid on the intermediate test position of chopped strand 6 and stirs spacer 11 and blocks water permeable membrane
7, such as Fig. 4, water permeable membrane 7 of the invention uses paper membrane or facial tissue, and water permeable membrane should pass through front and back pH value substantially not using aqueous slkali
The material of change, therefore can be using a level paper or paper membrane as water permeable membrane；
III. the chopped strand both ends handled well are placed into the first bottom rail 2-2's and the second bottom rail 3-2 with tweezers
It in card slot 12, adjusts simultaneously, it is ensured that test position, that is, test specimen water permeable membrane 7 is placed in square cavity 10 among test specimen；
IV. by several chopped strand samples are successively handled the step of II~III, positioning bolt is unscrewed, it will be horizontal on first
Shelves 2-1 and the second top rail 3-1 is closed by snapped-in position and the first bottom rail 2-2 and the second bottom rail 3-2, when closure, is taken
The phenomenon that whether concern chopped strand is extruded is carved, one it has been observed that vary at once), screw on positioning bolt；
V. cement mortar is made, cement mortar is filled up into square cavity 10, is uniformly distributed mortar, is touched with rubber hammer several
The pedestal 1 of lower mold eliminates the bubble being likely to occur, and removes extra mortar with spatula；
VI. preservative film is covered in die surface, is placed into standard curing box and conserve 24 hours, take out mold, dismounting the
One crosspiece 2 and the second crosspiece 3, remove test specimen, obtain accelerated ageing shaping test piece, structure such as Fig. 5.
(3) accelerated aging test：
I. fiber on accelerated ageing shaping test piece high temperature resistant is equably smeared with 5 link position of cement mortar block to be isolated
Agent forms high temperature resistant separation layer 8, and the present invention uses high temperature resistant butter, need to only guarantee butter of the resistance to temperature not less than 200 DEG C i.e.
Can, the hole that high temperature resistant butter has to occur is blocked；
II. the sample handled well is placed into the storage box for containing distilled water, liquid level will be more than sample 5cm on distilled water
Left and right), cover box cover；
III. storage box is placed into the constant water bath box of 80 DEG C (± 1 DEG C) 96 hours (± 1 hour), the cement of package
The fiber of mortar specimen 5 forms alkaline environment along with water gives cement sufficient hydration reaction condition, simulates true short
The working environment of fiber in practical applications is cut, it can be achieved that test specimen accelerated ageing.
(4) tensile test specimen makes：
I takes out the sample by accelerated ageing processing with tweezers, and chopped strand and cement mortar block 5 are removed, are used in combination
Flexible cleansing tissue wipes chopped strand surface to remove extra high temperature butter；
II. by the chopped strand handled well be placed into another equipped with distilled water storage box in, impregnate 24 hours (±
1 hour), the purpose is to handle the spot on chopped strand surface；
III. take out chopped strand, chopped strand be placed into the baking oven of 50 DEG C (± 5 DEG C), drying 1 hour (± 5 points
Clock)；
IV. chopped strand is taken out, binder, natural wind are coated into the designated position that chopped strand both ends are placed into adhesive sheet
It is 12 hours dry, tensile test specimen as shown in FIG. 6, fibre length >=10mm of the fixing end 9 of tensile test specimen is made；
V. original state tensile test specimen makes：10 original states (non-accelerated ageing processing) chopped strand sample is taken to be placed at random
The designated position of adhesive sheet stands for 24 hours after the completion of pasting, tensile test specimen as shown in FIG. 6, the fixing end 9 of tensile test specimen is made
Fibre length >=10mm；
(5) tension test：
I. it by the tension test sample clamping made at the collet of cupping machine, is loaded by the rate of 1mm/min；
II. data are recorded, data processing is carried out
(6) stretch test result is as follows：
1 short glass fiber original state sample S1 sample data of table
The accelerated aging process sample S2 test data of 2 short glass fiber of table
It is computed, tensile strength loss late C=11.6% < 20%, therefore, this batch of product can be used for alkali resistance
The cement concrete engineering that can be required.
Case study on implementation 2：3 people's parallel tests
Short glass fiber used by case 2 is different from the sample batch of embodiment 1, by laboratory technician A, B, C, 3
Laboratory technician carries out parallel test, and the repeatability of accelerated aging test, 3 laboratory technicians try simultaneously in the verifying present invention
It tests.
Stretch test result is as follows：
3 laboratory technician A of table
4 laboratory technician B of table
5 laboratory technician C of table
In order to more intuitively react repeatability, we have carried out the processing of analysis together, situation to the data of three groups of tests
It is as follows：
6 three groups of parallel test data processings of table
Finally, according to data comparison, three groups of test results differ very little, and the coefficient of variation≤14%, therefore institute of the present invention
It is feasible to state accelerated aging test method.
Case study on implementation 3：For being chopped basalt fibre
It changes the short glass fiber in case 1 into chopped basalt fibre to test, test result is as follows：
Table 7 is chopped basalt fibre original state sample S1 sample data
Table 8 is chopped the accelerated aging sample S2 sample data of basalt fibre
It is computed, tensile strength loss late C=47.98% > 20%, therefore, this batch of product is not useable for alkali resistance
The cement concrete engineering that can be required.
Case implements 4：By taking monofilament crude polypropylene fiber as an example
By the operating procedure of case study on implementation 1 to monofilament crude polypropylene fiber (length：60mm；450 μm of diameter) accelerated
Aging, tensile speed 10mm/min, test result are as follows：
9 polypropylene fibre original state S1 of table
The accelerated aging process polypropylene fibre S2 of table 10
It is computed, S1 ultimate strength is 68.46N；S2 ultimate strength is 68.73；Tensile strength loss late C=0% <
20%, thus test products can be used for having alkaline resistance properties to require cement concrete engineering in.
It was found from above-mentioned implementation process and its result：
(1) present invention and GB/T21120-2007《Cement concrete and mortar synthetic fibers》With prEN 14649：
2004(E)《The test method (SIC TEST) of glass fibre strength-retention in precast concrete product-cement and concrete》Institute
The method for directly carrying out tension test to sample after carrying out the processing of accelerated ageing system stated is compared, and the present invention describes in detail
Alkali proof fiber be chopped in the production method by accelerated ageing processing post-tensioning test specimen, it is ensured that will not be because trying caused by the reasons such as sliding
Test the inaccuracy of data.
(2) present invention and prEN 14649：2004(E)《Glass fibre is residual in precast concrete product-cement and concrete
Stay the test method (SIC TEST) of strength》Described compares for making filament of glass fibers accelerated ageing test piece mould, this
The mold of the accelerated ageing test specimen production of invention is more rationally especially to short glass fiber.
(3) present invention and prEN 14649：2004(E)《Glass fibre is residual in precast concrete product-cement and concrete
Stay the test method (SIC TEST) of strength》Described being realized by reserving groove with epoxy fill two sides is old to accelerating
The sealing for changing area is compared, and the present invention directly uses the mode of fiberglass sealed processing of the high temperature resistant interleaving agent to accelerated ageing part
It is more efficient.
(4) present invention and prEN 14649：2004(E)《Glass fibre is residual in precast concrete product-cement and concrete
Stay the test method (SIC TEST) of strength》The method phase of the direct joints cement mortar on glass fibre to be detected
Than the present invention is covered on glass fibre to be detected using water permeable membrane, then carries out the processing mode of cement mortar poured
It is more scientific and reasonable.
(5) present invention and prEN 14649：2004(E)《Glass fibre is residual in precast concrete product-cement and concrete
Stay the test method (SIC TEST) of strength》The direct test specimen to after accelerated ageing carries out tension test and compares, this
Invention by after accelerated ageing chopped boundling glass fibre and cement mortar block remove, can effectively exclude because cement with it is short
The case where cutting boundling glass fibre cohesive force and cement reinforcing fiber is caused to stretch force value, final test data inaccuracy are asked
Topic.
(6) present invention and prEN 14649：2004(E)《Glass fibre is residual in precast concrete product-cement and concrete
Stay the test method (SIC TEST) of strength》Described is immersed in sample in (20-25) DEG C water 15 minutes, is cooled down, so
Sample is taken out from cold water afterwards, is placed in the pallet of internal lining paper, the method for absorbing excessive moisture is compared, and the present invention is accelerating
After the completion of degradation processing, be chopped the distillation removing and be put under normal temperature state with cement briquette immediately of boundling glass fibre
24 hours in water (± 1 hour), finally by oven 1 hour of 50 DEG C (± 5 DEG C), to reach the mesh of samples dried
, this method is more reasonable, meets the scientific meaning of accelerated aging test.
(7) with glass fibre production technology, finally specification produced is the form that is chopped, long filamentous glass to cement concrete
Fiber is the process product in production technology, and prEN 14649：2004(E)《In precast concrete product-cement and concrete
The test method (SIC TEST) of glass fibre strength-retention》The glass fibre that the method can only be adapted under filament state is resistance to
Alkaline energy, test method of the present invention not only can detecte the glass fibre of filament state, in practical engineering application
Short glass fiber alkaline resistance properties detection also more reasonable.
(8) present invention also has operability and accuracy for the evaluation of common chopped fiber type, for the collection that is chopped
The evaluation of bundle fiber and the coarse-fibred alkaline resistance properties of chopped filaments has good versatility.
Claims (10)
1. a kind of method for detecting chopped strand alkaline resistance properties, which is characterized in that described method includes following steps：
（1）Spacer is passed through into chopped strand, every chopped strand two sides wear one；Water permeable membrane is uniformly laid on chopped
The intermediate test position of fiber simultaneously stirs spacer and blocks water permeable membrane；
（2）In step（1）The intermediate test position of the fiber pours cementitious material, and both ends uncovered fibres are formed after conserving,
The structure of centre package square cement mortar specimen；
（3）To step（2）The position that fiber is connect with cement mortar block in the structure is wrapped using high temperature resistant interleaving agent
Wrap up in processing, it is ensured that the inner space of coupling part be in closed state, after place it in the closed container for containing distilled water, distill
Liquid level waterborne is more than test specimen upper surface, the container is placed in place 96 ± 1 hours in 80 ± 1 DEG C of constant water bath box is added
Fast aging process；
（4）Sample is taken out, by the cement mortar block of package and the removing that is chopped, and removes the high temperature resistant isolation coated on fiber
Agent is placed in the closed container for containing distilled water, is impregnated 24 ± 1 hours；
（5）It takes out, is placed at 50 ± 5 DEG C 60 ± 5 minutes dry；
（6）Above-mentioned steps treated be chopped it is random each in the untreated chopped strand of peacekeeping choose at least 10, and
Fiber both ends are arranged fixing end as experimental group and are denoted as S1 and S2 respectively, it is ensured that the fibre length etc. of part of detecting among sample
In 10 ± 1mm；
（7）Tension test is carried out to S1 and S2 respectively, records maximum strength value when each sample destroys；
（8）Calculate separately strength average value, standard deviation and the coefficient of variation of non-S1 and S2；
（9）If the coefficient of variation of S1 or/and S2 is more than 14%, test specimen is chosen again, and repeat step（6）To step
（8）；
（10）The tensile strength loss late of sample is calculated by formula
×100%；
In formula：
—S1（Reset condition sample）The average value of ultimate strength value, unit N；
—S2（Accelerated ageing handles sample）The average value of ultimate strength value, unit N；
C-tensile strength loss late, %.
2. the method as described in claim 1, which is characterized in that step（2）In, the cementitious material includes following component：
32 parts by weight of 75 parts by weight of cement, 25 parts by weight of normal sand and distilled water.
3. the method as described in claim 1, which is characterized in that step（2）In, using mold to step（1）The fiber
Intermediate test position pours cementitious material, wherein the mold includes pedestal, the first crosspiece, the second crosspiece, limited block；First
Crosspiece and the second crosspiece are arranged in parallel on pedestal, if being all provided with placement location limited block on first crosspiece and the second crosspiece
A dry limiting slot, the limiting slot are symmetrical arranged, the first crosspiece and the second crosspiece and limited block collectively form it is mutually indepedent and
Mutual disconnected square cavity, the first crosspiece and the second crosspiece include upper layer and lower layer structure, in limiting slot side, the first crosspiece
In the understructure connecting with the second crosspiece with pedestal, the card slot parallel with limiting slot side is set.
4. the method as described in claim 1, which is characterized in that step（2）In, the size of square cement mortar specimen is 10 ±
1mm*10±1mm*10±1mm。
5. the method as described in claim 1, which is characterized in that step（3）In, high temperature resistant interleaving agent uses butter.
6. the method as described in claim 1, which is characterized in that step（3）In, liquid level is more than test specimen upper surface 5 on distilled water
±0.5cm。
7. the method as described in claim 1, which is characterized in that step（4）In, it is removed using the method for wiping and is coated on fiber
High temperature resistant interleaving agent.
8. the method as described in claim 1, which is characterized in that step（6）In, by adhesive sheet and fiber binder to fiber
Fixing end is arranged in both ends, wherein positioned at fibre length >=10mm of fixing end.
9. the method as described in claim 1, which is characterized in that step（7）In, the fixing end of sample to be tested in S1 and S2 is pressed from both sides
It holds in the narrow orifice of cupping machine, starts cupping machine, until sample destroys, the maximum recorded when each sample destroys is strong
Power, wherein tensile speed 1mm/min.
10. the method as described in claim 1, which is characterized in that step（8）In, with formula（I）Calculate examination
The strength average value of sample；With formula S=（II）Calculate the standard deviation of sample；With formula Cv (%)=（III）The coefficient of variation for calculating sample, in formula：Represent the average value of S1 or S2 ultimate strength value, unit N；It represents in S1 or S2The ultimate strength value of sample, unit N；N represents the number of sample, n=10；Represent the serial number of sample；S
Represent the standard deviation of S1 or S2；Cv represents the coefficient of variation of S1 or S2.
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