CN106248800A - A kind of method evaluating concrete temperature fracture based on circle ring test - Google Patents
A kind of method evaluating concrete temperature fracture based on circle ring test Download PDFInfo
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- CN106248800A CN106248800A CN201610547645.6A CN201610547645A CN106248800A CN 106248800 A CN106248800 A CN 106248800A CN 201610547645 A CN201610547645 A CN 201610547645A CN 106248800 A CN106248800 A CN 106248800A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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Abstract
A kind of based on circle ring test evaluate concrete temperature fracture method, relate to concrete occurs under the effect of temperature load fracture time, its characteristic is analyzed evaluation Experimental Method in Laboratory.The present invention is on the basis of existing technology, the material utilizing this linear expansion coefficient of indium steel the least provides internal constraint for concrete, in conjunction with concrete humiture curing box and acoustic emission device, achieve to concrete under conditions of by interior constraint, the observation of phenomenon of rupture occurs during carrying out cooling.The present invention gives a kind of simple Experimental Method in Laboratory being suitable for the temperature fracture characteristics of research concrete, can contrast concrete the most of the same race and the concrete of the same race ability in different larval instar opposing temperature fracture under the guidance of the method.
Description
Technical field
The present invention relates to a kind of method evaluating concrete temperature fracture based on circle ring test, particularly to evaluating coagulation
Soil early age resists the method for the ability of temperature fracture under conditions of having interior constraint.
Background technology
At the temperature rise phase of dam concrete, concrete maximum temperature is likely to be breached more than 60 DEG C, if now outside concrete
Surface temperature changes, and will directly affect the temperature stress situation of concrete.If running into unexpected cold wave or bigger
Day and night temperature, there's a sudden fall in temperature to cause concrete outer surface, then can produce the biggest thermograde inside and outside mass concrete,
Outer surface produces bigger temperature tension, and when stress exceedes the tensile strength of surface concrete, concrete will ftracture.
Mostly traditional research technique is the tensile and compressive strength using the mode directly adding mechanical load to obtain concrete, not
Use and directly utilize the research technique that temperature is destroyed to make concrete occur, and this at most causes coagulation in Practical Project exactly
The load form of soil fracture.Consider the ability of concrete opposing fracture, should only not consider its intensity, also should consider it simultaneously
Elastic modelling quantity and the lax performance such as creep, and this tensile compression test being conventional cannot be accomplished.Existing ring method is to utilize steel
The constraint that concrete is produced by ring, analyzes the fracture that concrete is caused by autogenous shrinkage, is that one takes full advantage of coagulation
The research technique of soil self property.But this method test cycle is long, and the breakoff phenomenon produced is inconspicuous, simultaneously because conventional
The linear expansion coefficient of steel is general and concrete is almost (all 1 × 10-5℃-1Left and right), steel temperature changes when
The deformation that material can be closer to jointly with concrete, is unfavorable for producing sufficiently strong constraint.
Summary of the invention
It is an object of the invention to provide a kind of method evaluating concrete temperature fracture based on circle ring test, to overcome biography
System research technique only considers its intensity when considering concrete cracking, and it is disconnected to make concrete occur not directly utilize temperature
Active element when splitting.Make the method can directly utilize variations in temperature and the active element of fracture, fully profit occur as concrete
With the material character of concrete self, the ability of temperature deformation resisted under conditions of temperature jump by overall merit concrete.
It is an object of the invention to be achieved through the following technical solutions, the program comprises the steps:
A kind of method evaluating concrete temperature fracture based on circle ring test, it is characterised in that the method includes walking as follows
Rapid:
1) first make many set steel toroidal mold, and the steel substrate of steel toroidal mold can be fixed, by steel
Toroidal mold is arranged on steel substrate, it is ensured that the two center alignment；
2) installing dismountable indium steel cylinder at the center of steel substrate, its height must be with the height phase of steel toroidal mold
Deng；
3) difference casting concrete in above-mentioned many molds, makes concrete sample multiple of the same race or the most of the same race, will be mixed
The test specimen vibratory compaction molding on small vibrating platform of solidifying soil, covers preservative film subsequently and prevents moisture on each concrete sample surface
Evaporation；
4), after concrete sample final set form removal, steel toroidal mold and steel substrate are removed, by concrete sample together with
Indium steel cylinder is inserted in concrete humiture curing box together, arranges the curing temperature of curing box more than 50 DEG C, relative humidity
More than 95%；
5) after reaching curing age, concrete sample is taken out, exists side by side and be engraved on concrete sample installation acoustic emission probe,
In test, concrete fracture detected and position；
6), after acoustic emission probe installs, concrete sample is placed in cold water storage cistern at once and cools down, at water tank
Middle placement temperature sensor, detects concrete sample fracture process at a certain temperature with acoustic emission device, and remembers
There is the time t of fracture in record concrete sample, measures concrete with distress in concrete defect comprehensive tester at the same temperature
The fracture characteristic of test specimen: fracture length s, width w and degree of depth h；
7) under the conditions of Homogeneous assay, the fracture characteristic of the concrete of different larval instar of the same race or the most of the same race is contrasted, to concrete
Temperature fracture characteristics carry out comparative evaluation: rupture time t is the longest, and fracture length s, width w, degree of depth h are the least, then characterize coagulation
The characteristic of soil opposing temperature fracture under this condition is the strongest；Otherwise it is the most weak.
Preferably, the inside radius of steel toroidal mold is 140～160mm, height be 80～100mm, thickness be 5～
10mm；The outer radius of described indium steel cylinder is 90～100mm.
Preferably, steel substrate is square steel substrate.
Preferably, concrete sample is the most uniformly installed 8 acoustic emission probes.
In technique scheme, described curing age is 7 days, 14 days, 28 days or more long-age.
The present invention compared with prior art, has the following advantages and salience effect:
1. directly utilize variations in temperature and the active element of fracture occurs as concrete, concrete self can be made full use of
Material character, the ability of temperature deformation resisted under conditions of temperature jump by overall merit concrete；2. indium steel is used
(also transliteration is indium steel or invar for Invar, invar alloy, is the ferroalloy containing 35% nickel, and it is swollen because having the lowest line
Swollen coefficient, and rigidity is close with common iron, is referred to as " king of metal " or " without expansion alloy ") as constraint in concrete
Material, make full use of that the indium steel wire coefficient of expansion is the least and characteristic that rigidity is the biggest (average coefficient of linear expansion is 0.87 × 10-6
℃-1, the average mould that plays is more than 200GPa), thus bigger deformation will not occur under conditions of variations in temperature, also will not be because of coagulation
Soil shrinks extruding and produces bigger deformation, thus the strongest to the interior binding character of concrete；3. acoustic emission device is used
The destructive process of concrete is detected, can precisely determine the moment occurring to destroy, and damage is positioned, overcome
The corresponding shortcoming that traditional round is around-France；4. test principle is simple, and test mould is built simply, easy to operate.
Accompanying drawing explanation
Fig. 1 is toroidal mold horizontal sectional drawing.
Fig. 2 is toroidal mold vertical cross-sectional view.
When Fig. 3 is for test, acoustic emission probe schematic diagram is installed.
Fig. 4 is the macrocrack of the raw fracture of concrete circular environment-development.
Fig. 5 a, 5b are the C30 concrete and C20 concrete cracking recorded with distress in concrete defect comprehensive tester respectively
Maximum crack width.
Wherein: 1-concrete sample；2-indium steel cylinder；3-steel toroidal mold；4-acoustic emission probe.
Detailed description of the invention
Embodiments of the present invention are further illustrated below in conjunction with the accompanying drawings with embodiment:
The present invention on the basis of existing technology, further with humiture curing box for concrete provide higher at the beginning of
Beginning temperature field, use indium steel this temperature deformation is minimum and the constraint in be concrete sample provide of material that rigidity is the biggest, simultaneously
Detecting the fracture process of concrete in conjunction with acoustic emission device, its detailed description of the invention can be carried out as follows:
1) first making many set steel toroidal mold 3, steel toroidal mold is preferably dimensioned to be: inside radius 140～
160mm, height is 80～100mm, and thickness is 5～10mm, supporting making square steel substrate, opens at the center of steel substrate
One screw, uses a long spiro nail to install indium steel cylinder (center drilling is used for fixing).As shown in Figure 1 and Figure 2；
2) casting concrete test specimen 1 in above-mentioned mould, it is ensured that the medial surface of concrete sample closely connects with indium steel cylinder 2
Touch.Multiple concrete sample (can be concrete of the same race or the most of the same race) can be made, by concrete sample at small vibrating simultaneously
Vibratory compaction molding on platform, covers preservative film subsequently and prevents moisture from evaporating on concrete sample surface；
3) (12～24h) after concrete sample final set collapsible die, tear and cover the preservative film on concrete sample surface, and
Steel toroidal mold and the steel substrate of test specimen are removed；Again concrete sample is placed into concrete together with indium steel cylinder
In humiture curing box.Arranging the curing temperature of curing box more than 50 DEG C, relative humidity is more than 95%；
4) until concrete sample after reaching curing age in humiture curing box (7 days, 14 days, 28 days or more long-age)
Concrete sample is taken out, exists side by side and be engraved on concrete sample installation acoustic emission probe, in test, concrete fracture is entered
Row detection and location, be usually on concrete sample and the most uniformly install 8 acoustic emission probes (as shown in Figure 3),
Why to install 8 acoustic emission probes in this position, any point being because so may insure that on annulus specimen is all
Can be arrived by 3 probe detections simultaneously, guarantee any one place and rupture, acoustic emission probe can accomplish accurate timing with
Location.
5) then concrete sample is placed in cold water storage cistern at once and cools down, use refrigerating circulatory device in water tank
Water be circulated refrigeration, and in water tank, place temperature sensor, the chilling temperature value of water tank be set, when water tank temperature reaches
During preset temperature, keep water temperature constant；Start acoustic emission device to start to gather signal simultaneously, the fracture process of concrete is carried out
Detection.Observation experiment phenomenon, and record and put into cold water storage cistern to there is the time t of fracture from concrete sample, stop test and also will
Concrete sample takes out, the fracture position measured according to acoustic emission probe, measures mixed with distress in concrete defect comprehensive tester
Fracture characteristic (fracture length s, width w and the degree of depth h), and Taking Pictures recording of solidifying soil；
6) under the conditions of Homogeneous assay, contrast concrete the most of the same race or the fracture characteristic of different larval instar concrete of the same race, permissible
The temperature fracture characteristics of concrete is carried out comparative evaluation: concrete occurs the time t of fracture the longest, fracture length s of generation,
Width w, degree of depth h are the least, then characterize concrete resist under this condition temperature fracture ability the strongest；Otherwise, if concrete is sent out
The time t of raw fracture is the shortest, and fracture length s of generation, width w, degree of depth h are the biggest, then characterize concrete and resist under this condition
The ability of temperature fracture is the most weak.
Embodiment
The present embodiment has made the steel toroidal mold that internal diameter × height is 150 × 80mm, and its thickness is 10mm, supporting steel
Base plate size processed is 400 × 400mm.And dress radius of feeling at ease in a mold be 100, height be 80mm indium steel cylinder, use screw
Indium steel cylinder is fixed on steel substrate.
Concrete process of the test: 1) prepare 4 molds and pour each 2 of the concrete sample of C30 and C20, respectively numbered 1
～No. 4, and vibratory compaction on small vibrating platform, stick preservative film on surface subsequently and prevent moisture loss；2) treat that concrete tries
Part final set form removal, inserts humiture environmental cabinet by test specimen together with indium steel kernel, and the curing temperature arranging environmental cabinet is 60 DEG C,
Humidity is 98%；3), after arriving 7 days curing age, test specimen is taken out, is placed at once in cold water and makes test specimen cool down, observation experiment
Phenomenon；4) there is the moment of fracture in record, measures concrete fracture feature.Result of the test is as shown in the table, and Fig. 4 is concrete circular
The macrocrack of the raw fracture of environment-development, it can be seen that crack is outwards to develop from the junction of concrete Yu indium steel kernel；Fig. 5 a
Being the maximum crack width of the C30 concrete cracking recorded with distress in concrete defect comprehensive tester, Fig. 5 b is C20 concrete
The maximum crack width of cracking.
Embodiment table 1 C30 and C20 concrete test result
Can be seen that the present invention can utilize the evaluation concrete temperature of circle ring test to break well from above embodiment
Splitting, the method can directly utilize variations in temperature and the active element of fracture occurs as concrete, takes full advantage of concrete self
Material character, the ability of temperature deformation resisted under conditions of temperature jump by overall merit concrete.
Claims (5)
1. the method evaluating concrete temperature fracture based on circle ring test, it is characterised in that the method includes walking as follows
Rapid:
1) first make many set steel toroidal mold, and the steel substrate of steel toroidal mold can be fixed, by steel annulus
Mould is arranged on steel substrate, it is ensured that the two center alignment；
2) installing dismountable indium steel cylinder (2) at the center of steel substrate, its height must be with the height phase of steel toroidal mold
Deng；
3) difference casting concrete in above-mentioned many molds, makes concrete sample multiple of the same race or the most of the same race, by concrete
Test specimen is vibratory compaction molding on small vibrating platform, covers preservative film subsequently on each concrete sample surface and prevents moisture from steaming
Send out；
4), after concrete sample final set form removal, steel toroidal mold and steel substrate are removed, by concrete sample together with indium steel
Cylinder is inserted in concrete humiture curing box together, arranges the curing temperature of curing box more than 50 DEG C, and relative humidity exists
More than 95%；
5) after reaching curing age, concrete sample is taken out, exist side by side and be engraved on concrete sample installation acoustic emission probe, be used for
Concrete fracture is detected by test and positions；
6), after acoustic emission probe installs, concrete sample is placed in cold water storage cistern at once and cools down, put in water tank
Put temperature sensor, with acoustic emission device, concrete sample fracture process at a certain temperature is detected, and record mixed
There is the time t of fracture in solidifying soil test specimen, measures concrete sample with distress in concrete defect comprehensive tester at the same temperature
Fracture characteristic: fracture length s, width w and degree of depth h；
7) under the conditions of Homogeneous assay, contrast the fracture characteristic of the concrete of different larval instar of the same race or the most of the same race, the temperature to concrete
Degree fracture characteristics carries out comparative evaluation: rupture time t is the longest, and fracture length s, width w, degree of depth h are the least, then characterize concrete and exist
The characteristic resisting temperature fracture under the conditions of Gai is the strongest；Otherwise it is the most weak.
A kind of method evaluating concrete temperature fracture based on circle ring test the most according to claim 1, its feature exists
In: the inside radius of steel toroidal mold is 140～160mm, and height is 80～100mm, and thickness is 5～10mm；Described indium steel circle
The outer radius of post is 90～100mm.
A kind of method evaluating concrete temperature fracture based on circle ring test the most according to claim 1 and 2, its feature
It is: steel substrate is square steel substrate.
A kind of method evaluating concrete temperature fracture based on circle ring test the most according to claim 1, its feature exists
In: 8 acoustic emission probes (4) are the most uniformly installed on concrete sample.
A kind of method evaluating concrete temperature fracture based on circle ring test the most according to claim 1, its feature exists
In: curing age is 7 days, 14 days, 28 days or more long-age.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561251A (en) * | 2017-09-22 | 2018-01-09 | 北京建筑大学 | A kind of cement-based material cracking sensitivity test device and method of testing |
| CN108593770A (en) * | 2018-03-29 | 2018-09-28 | 中国水利水电科学研究院 | Concrete imitation true experiment machine is combined the apparatus and method of monitoring concrete overall process cracking with microseism |
| CN108627401A (en) * | 2018-03-13 | 2018-10-09 | 中国建筑股份有限公司 | A kind of concrete morning age temperature stress testing equipment and method based on ring method |
| CN109507398A (en) * | 2018-11-26 | 2019-03-22 | 河海大学 | A kind of surface crack is to concrete internal temperature field coverage prediction technique |
| CN110672727A (en) * | 2019-10-21 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Building material structural performance detection device |
| CN112858072A (en) * | 2021-01-04 | 2021-05-28 | 浙江工业大学 | Method for testing temperature stress of concrete |
| CN112857963A (en) * | 2021-01-04 | 2021-05-28 | 浙江工业大学 | Concrete constraint stress component separation method and system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107561251A (en) * | 2017-09-22 | 2018-01-09 | 北京建筑大学 | A kind of cement-based material cracking sensitivity test device and method of testing |
| CN108627401A (en) * | 2018-03-13 | 2018-10-09 | 中国建筑股份有限公司 | A kind of concrete morning age temperature stress testing equipment and method based on ring method |
| CN108627401B (en) * | 2018-03-13 | 2021-01-05 | 中国建筑股份有限公司 | Concrete early-age temperature stress test equipment and method based on torus method |
| CN108593770A (en) * | 2018-03-29 | 2018-09-28 | 中国水利水电科学研究院 | Concrete imitation true experiment machine is combined the apparatus and method of monitoring concrete overall process cracking with microseism |
| CN109507398A (en) * | 2018-11-26 | 2019-03-22 | 河海大学 | A kind of surface crack is to concrete internal temperature field coverage prediction technique |
| CN110672727A (en) * | 2019-10-21 | 2020-01-10 | 中铁第四勘察设计院集团有限公司 | Building material structural performance detection device |
| CN112858072A (en) * | 2021-01-04 | 2021-05-28 | 浙江工业大学 | Method for testing temperature stress of concrete |
| CN112857963A (en) * | 2021-01-04 | 2021-05-28 | 浙江工业大学 | Concrete constraint stress component separation method and system |
| CN112857963B (en) * | 2021-01-04 | 2022-11-25 | 浙江工业大学 | Concrete constraint stress component separation method and system |
| CN112858072B (en) * | 2021-01-04 | 2022-11-25 | 浙江工业大学 | Method for testing temperature stress of concrete |
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Application publication date: 20161221 |