CN103513018A - Systematic detection method for anti-cracking performance of concrete - Google Patents
Systematic detection method for anti-cracking performance of concrete Download PDFInfo
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Abstract
The invention relates to a systematic detection method for an anti-cracking performance of concrete and in particular relates to a systematic detection method for comprehensively judging the anti-cracking performance of the concrete by detecting an anti-cracking safety coefficient, a shrinkage strain amount, a strength and elastic modulus development curve, a strain concentration point and the restriction degree. The detection method comprises the following steps of detecting a temperature strain parameter of the concrete to judge the anti-cracking safety coefficient of the concrete; detecting a shrinkage strain value of the concrete to judge the shrinkage strain amount of the concrete; detecting the maturity of the concrete to construct the strength and the elastic modulus development curve; simulating and calculating the strain concentration point of the concrete through a central processing unit; detecting a friction coefficient of a concrete entity model to judge the restriction degree of the concrete; comprehensively evaluating the anti-cracking performance of the concrete according to the steps. According to the systematic detection method, the anti-cracking performance of the concrete can be effectively detected, and the manufacturing quality of the concrete is improved, so that the concrete can meet a requirement of a high-standard submarine construction environment.
Description
Technical field
The present invention relates to a kind of crack-resistant performance of concrete systematization detection method, relate in particular to a kind of systematization detection method of comprehensively passing judgment on crack-resistant performance of concrete by detecting factor of safety against cracking, contraction strain amount, intensity and elastic modulus progress curve, stress concentration point and degree of restraint.
Background technology
Concrete tunnel Construction amount in seabed is increasing year by year in the world at present, and scale is expanding year by year, and the difficulty in precast concrete tunnel is progressively strengthening.Concrete tunnel structure is affected by the factors such as heavy in section, large volume, version and complicated construction technique, and the reasons such as easy Yin Wendu, contraction and constraint just occur harmfulness crack in the construction stage; The technical sophistication of tunnel in sea engineering, standard high; For guaranteeing the serviceable life of its tunnel main body, in prefabricated construction process, must take reasonable effective method to evaluate cracking of reinforced concrete, optimize the most reasonably match ratio and construction technology.
For the Crack Control Technology research in tunnel, mainly concentrate at present the concrete tunnel of dry-docking method making both at home and abroad, and for adopting the prefabricated concrete tunnel of the factory law, it is the first that concrete tunnel prefabricating technique still belongs at home, can be for using for reference without ripe construction technology experience, therefore think and be necessary the prefabricated xoncrete structure splitting resistance evaluation aspect of batch production to conduct a research.
Be to concrete anticracking Journal of Sex Research and the existing many-sided achievement of evaluation at home before, " marine traffic engineering temperature cracks control of mass concrete technical regulation " that for example water transport industry was compiled and edit in 2010 (JTJ202-2010), these rules are applicable to the permanent hydraulic structure temperature cracks control of mass concrete of marine traffic engineering design and construction.From concrete raw material choose, detailed regulation ，Dui water running sparetime university volume concrete cracking has all been done in the aspect such as mix-design, temperature control measures and construction time temperature monitoring, and main cause---temperature stress is controlled from source.But for precast concrete tunnel, the structures such as pier, pier stud, breastwork and caisson in the more traditional water transport industry of its structure are more complicated, comprised mass concrete, also comprised the privileged sites such as ,Duo turning, heavy in section.It is excessive that causes of concrete cracking not only comprises temperature stress, also comprise shrink excessive, retrain the many-sides such as excessive and strength development specific (special) requirements, therefore only adopt and in " rules ", temperature stress is controlled just too unilaterally, need to adopt concrete anticracking evaluation method more comprehensively.
Therefore, need to utilize existing control to split advanced means to cracking of reinforced concrete evaluation, carry out sequencing research, work out a set of effective method, from each influence factor comprehensive evaluation cracking of reinforced concrete of starting with.
For above deficiency, the present invention is badly in need of providing a kind of new crack-resistant performance of concrete systematization detection method.
Summary of the invention
The object of this invention is to provide a kind of crack-resistant performance of concrete systematization detection method, the method realizes the comprehensive object of passing judgment on crack-resistant performance of concrete by detecting factor of safety against cracking, contraction strain amount, intensity and elastic modulus progress curve, stress concentration point and degree of restraint.
The object of the invention is to be achieved through the following technical solutions: a kind of crack-resistant performance of concrete systematization detection method, described detection method comprises the following steps:
S1, detection concrete temperature stress parameter judge concrete factor of safety against cracking;
S2, detection concrete shrinkage strain value judge concrete contraction strain amount;
S3, detection concrete riper are set up intensity and elastic modulus progress curve;
S4, central processing unit analog computation go out concrete stress concentration point;
The friction factor judgement concrete degree of restraint of S5, detection concrete solid model;
S6, according to above-mentioned steps, comprehensively pass judgment on crack-resistant performance of concrete.
Further comprising the steps of in described step S1:
S11, the concrete of many parts of different proportionings is prepared into many parts of concrete mortars;
S12, each concrete mortar is built respectively to temperature stress testing machine;
S13, control temperature stress testing machine detect respectively the temperature stress parameter of each concrete mortar;
S14, central processing unit go out each concrete temperature stress value according to the temperature stress calculation of parameter of each concrete mortar;
S15, central processing unit contrast according to default actual measurement tensile stress value and each concrete temperature stress value, and calculate each concrete factor of safety against cracking;
S16, filter out the concrete that meets factor of safety against cracking scope.
Further comprising the steps of in described step S2:
S21, the concrete of many parts of different proportionings is prepared into many parts of concrete mortars by its water-cement ratio;
S22, by small circle ring, test the contraction strain that each concrete mortar is carried out in critical field and monitor;
S23, monitor each concrete cracking time, and filter out concrete not easy to crack;
S24, the concrete of many parts of different proportionings is prepared into many parts of concrete mortars;
S25, by each concrete mortar build respectively to dry shrink and self-constriction instrument in;
S26, measure concrete mortar amount of contraction at the appointed time;
S27, the concreting full size of many parts of different proportionings cun examination is watered to block models;
S28, by being arranged on full size cun examination, water strain transducer Real-Time Monitoring concrete on shrinkage characteristic point in block models in the values of shrinkage strain of each time point;
S29, central processing unit are analyzed concrete shrinkage strain trend according to each values of shrinkage strain, and are judged according to this concrete shrinkage dependent variable.
Further comprising the steps of in described step S3:
Each temperature acquisition point set temperature sensor of S31, concrete component;
S32, central processing unit calculate the temperature data real-time monitoring draw the concrete riper curve of each temperature acquisition point of concrete;
In S33, testing laboratory, record intensity and elastic modulus that piece is watered in each concrete examination;
S34, central processing unit calculate concrete intensity and elastic modulus progress curve.
Further comprising the steps of in described step S4:
S41, central processing unit are set up concrete mechanical model;
S42, on mechanical model, choose the point of application of acting force, and simulate application of force process;
S43, central processing unit carry out to the acting force of each point of application the stress value that superposition calculation draws each point of application, with this, find out concrete stress concentration point;
Further comprising the steps of in described step S5:
S51, utilize gravity similarity criterion to manufacture concrete solid model;
S52, utilize the dilatory concrete solid model of lifting jack level and detect value of thrust;
S53, according to the weight of concrete solid model and value of thrust, calculate friction factor;
S54, by friction factor, judge concrete degree of restraint.
Described concrete solid model is that length is 1m, and the bottom shape rectangular parallelepiped concrete block identical with actual concrete, and bottom support situation conforms to actual concrete.
Central processing unit calculates the concrete riper curve of each temperature acquisition point of concrete according to following formula:
Central processing unit calculates concrete intensity and elastic modulus progress curve according to following formula:
E＝E
0·(1-e
-at)
Described strain transducer adopts flush type vibratory string strain transducer, and cun examination of described full size is watered block models length and is not less than 1m.
The present invention compared with prior art has advantages of following:
1, the present invention judges concrete factor of safety against cracking by detecting concrete temperature stress parameter, and the crack-resistant performance of concrete being screened to guarantee meets the scope of factor of safety against cracking; Make selected concrete there is high cracking resistance, thereby make concrete product there is safety and quality assurance.
2, the present invention judges concrete contraction strain amount by detecting concrete shrinkage strain value, and the concrete shrinkage dependent variable of being screened to guarantee is little; Make selected concrete there is high cracking resistance, not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
3, the present invention sets up concrete strength and elastic modulus progress curve by detecting concrete riper, by the analysis to intensity and elastic modulus progress curve, can know intensity and the larger concrete of elastic modulus progress curve, its concrete strength is higher, and the concrete being screened to guarantee has enough intensity; Make selected concrete there is high cracking resistance, not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
4, the present invention goes out concrete stress concentration point by central processing unit analog computation, and according to concrete stress concentration point in the corresponding actual concrete construction of the stress concentration point simulating, and these stress concentration points are taked to the measure anticrackings such as reinforcement, special curing; To concrete integral structure, directive function is played in design, to guarantee that concrete has enough intensity; Not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
5, the present invention judges concrete degree of restraint by detecting the friction factor of concrete solid model; Little to guarantee that concrete is affected by friction force, make its degree of restraint low; Thereby guarantee that it has higher cracking resistance; Not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is step block diagram of the present invention.
Embodiment
Shown in Figure 1, crack-resistant performance of concrete systematization detection method of the present invention, described detection method comprises the following steps:
1, detect concrete temperature stress parameter and judge concrete factor of safety against cracking:
The concrete of many parts of different proportionings is prepared into many parts of concrete mortars; Each alternative concrete is extremely in good condition by its proportioning trial mix, and each makes 60L concrete mortar.
Each concrete mortar is built respectively to the mould of temperature stress testing machine; By set testing program, set, regulate temperature stress testing machine operating system to test.
Control the temperature stress parameter that temperature stress testing machine detects respectively each concrete mortar; Described temperature stress parameter comprises aquation temperature rise, temperature rise time, thermal expansivity, fracture temperature etc.In the present embodiment, different concrete is measured to its aquation temperature rise (20 ℃, 30 ℃, 40 ℃, 50 ℃) and temperature rise time (10h, 20h, 30h, 40h) scope, heating in judgement concrete, temperature characteristic; Measure the characteristics such as thermal expansivity (around 1 * 10-5/ ℃) and the strain of fracture temperature demonstration concrete heat, heat sensitivity, concrete strain variation, crack appearance point while judging that with this in mould, concrete surface is to unexpected temperature rise, temperature drop.Can set different molding temperatures according to temperature stress testing machine, set as required, keep concrete environment temperature, make experience wide temperature fluctuations in the concrete short time, and (30 ℃～-10 ℃) impel it to rupture under the state of cooling rapidly, to determine the ultimate temperature that fracture occurs.
Central processing unit goes out each concrete temperature stress value according to the temperature stress calculation of parameter of each concrete mortar, and simulates Thermal Stress Field according to temperature stress value; In central processing unit in the present embodiment, be provided with MIDAS Civil Space Finite Element Analysis software; By this software computing and simulate the three-dimensional configuration of each concrete Thermal Stress Field, so that workmen's reference and analysis; More directly perceived concrete.
Central processing unit contrasts according to default actual measurement tensile stress value and each concrete temperature stress value, and calculates each concrete factor of safety against cracking.
Can change simulated condition, analyze concrete different molding temperature, curing condition, lift height and whether arrange cooling water pipe situation; Find out concrete structure temperature field, temperature stress field distribution, temperature top, position, top, time and relevant temperature stress, and instruct the cooling measure in actual concrete pouring construction with this.
By above step, filter out the concrete that meets factor of safety against cracking scope; When factor of safety against cracking is less than 1.4, belong to safe range.
The present invention judges concrete factor of safety against cracking by detecting concrete temperature stress parameter, and the crack-resistant performance of concrete being screened to guarantee meets the scope of factor of safety against cracking; Make selected concrete there is high cracking resistance, thereby make concrete product there is safety and quality assurance.
2, detect concrete shrinkage strain value and judge concrete contraction strain amount:
The concrete of many parts of different proportionings is prepared into many parts of concrete mortars by its water-cement ratio; Put into small circle ring and carry out the contraction strain monitoring of critical field, by small circle ring, test the contraction strain that each concrete mortar is carried out in critical field and monitor; After solidifying, observes concrete mortar its cracking time (be accurate to minute, 200min, 250min, 300min);
Under different maintenance environment, monitor respectively each concrete cracking time, the relative value of getting each concrete cracking time compares, and filters out concrete not easy to crack.
The concrete of many parts of different proportionings is prepared into many parts of concrete mortars; Each concrete mortar is built respectively to the mould of dry contraction and self-constriction instrument.
Measure concrete mortar (3d, 7d, 14d, 28d, 56d, 90d) interior amount of contraction (200 μ, 250 μ, 300 μ, 350 μ) at the appointed time; In order to weigh concrete contraction strain characteristic; Unified measurement under equivalent environment, measures three parts of concrete mortars for every group.
The concrete of many parts of different proportionings is built respectively to a full size cun examination and water block models; The actual maintenance situation that the maintenance situation of block models can simulation concrete is watered in this full size cun examination, and free setting according to actual needs.
By being arranged on full size cun examination, water strain transducer Real-Time Monitoring concrete on shrinkage characteristic point in block models in the values of shrinkage strain of each time point; Described shrinkage characteristic point position refers to the position (being generally maximized surface length or Width) that best embodies concrete shrinkage.
After having built, central processing unit carries out frequency immediately in the contraction strain monitoring of " inferior/1 hour " left and right, after approximately 1 week, can suitably reduce frequency to " inferior/2 ~ 4 hour ", central processing unit is analyzed concrete shrinkage strain trend according to each values of shrinkage strain, and judges according to this concrete shrinkage dependent variable; Particularly judge the situation of concrete shrinkage characteristic point position tension or pressurized; The values of shrinkage strain judgement contraction situation arranging by the collection after some months, when the strain value of strain transducer surpasses 100 μ, should try to water block models to each full size cun immediately and carry out flaw detection.Utilize and in central processing unit, be provided with MIDAS Civil Space Finite Element Analysis software; By this software computing and simulate each concrete values of shrinkage strain change curve, so that workmen's reference and analysis; More directly perceived concrete.
Strain transducer described in the present embodiment adopts flush type vibratory string strain transducer, and cun examination of described full size is watered block models length and is not less than 1m.
The present invention judges concrete contraction strain amount by detecting concrete shrinkage strain value, and the concrete shrinkage dependent variable of being screened to guarantee is little; Make selected concrete there is high cracking resistance, not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
3, detect concrete riper and set up intensity and elastic modulus progress curve:
Prepare many parts of concrete components; Each temperature acquisition point set temperature sensor of concrete component, carries out temperature monitoring with this to concreting process; The concrete of many parts of different proportionings is built respectively to each concrete component, make concrete examination and water piece; Described temperature acquisition point refers to geometric center or the lip-deep collection position with temperature acquisition value that is positioned at concrete component.
In concreting process, central processing unit calculates the temperature data real-time monitoring draw the concrete riper curve of each temperature acquisition point of concrete; Central processing unit calculates the concrete riper curve of each temperature acquisition point of concrete according to following formula:
In testing laboratory, record intensity and elastic modulus that piece is watered in each concrete examination; If laboratory condition can accomplish arbitrarily to set the curing temperature that piece is watered in examination, each examination can be watered to piece and be put into respectively under different curing temperatures and carry out maintenance, measure respectively their intensity and elastic modulus and depict its progress curve.
Central processing unit calculates concrete intensity and elastic modulus progress curve according to the intensity of the concrete riper of each temperature acquisition point, rebound strength and each temperature acquisition point and elastic modulus; Intensity and elastic modulus progress curve are larger represents that concrete strength is higher.
Central processing unit calculates concrete intensity and elastic modulus progress curve according to following formula:
E＝E
0·(1-e
-at)
Can after concreting, utilize the reisilometer concrete body structure surface intensity of field survey at the scene, the intensity simulating and elasticity progress curve are carried out to complementarity checking.
Utilize and in central processing unit, be provided with MIDAS Civil Space Finite Element Analysis software; By this software computing and simulate each concrete intensity and elastic modulus progress curve, so that workmen's reference and analysis; More directly perceived concrete.
The present invention sets up concrete strength and elastic modulus progress curve by detecting concrete riper, by the analysis to intensity and elastic modulus progress curve, can know intensity and the larger concrete of elastic modulus progress curve, its concrete strength is higher, and the concrete being screened to guarantee has enough intensity; Make selected concrete there is high cracking resistance, not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
4, central processing unit analog computation goes out concrete stress concentration point:
Utilize the MIDAS Civil Space Finite Element Analysis software in central processing unit to set up concrete mechanical model; The mechanical characteristic of this mechanical model, restraint condition conform to the situation of actual concrete in building as far as possible.
On mechanical model, choose the point of application of acting force, and simulate application of force process; Specifically: on 3 ~ 4 different faces of mechanical model, respectively choose an application point, on this application point, act on respectively 4 acting forces of the constant magnitude of vertical direction each other, and carry out Mechanics Calculation.
Central processing unit carries out to the acting force of each point of application the stress value that superposition calculation draws each point of application, with this, finds out concrete stress concentration point; Central processing unit is simulated the stress value that different operating modes calculate respectively each application point under each operating mode; The stress absolute value of each application point is superposeed respectively, find out several application points of stress value maximum, assert that these application points are the stress concentration point easily forming in concreting.
The present invention goes out concrete stress concentration point by central processing unit analog computation, and according to concrete stress concentration point in the corresponding actual concrete construction of the stress concentration point simulating, then these stress concentration points are taked to the measure anticrackings such as reinforcement, special curing; To concrete integral structure, directive function is played in design, to guarantee that concrete has enough intensity; Not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
5, detect the friction factor judgement concrete degree of restraint of concrete solid model:
Utilize gravity similarity criterion to manufacture concrete solid model;
Utilization is drawn concrete solid model and detects value of thrust with the lifting jack level of force measuring function;
According to the weight of concrete solid model and value of thrust, calculate friction factor;
Friction factor
By friction factor, judge concrete degree of restraint; μ is larger, retrains larger.
Described concrete solid model is that length is 1m, and the bottom shape rectangular parallelepiped concrete block identical with actual concrete, and bottom support situation conforms to actual concrete.
The present invention judges concrete degree of restraint by detecting the friction factor of concrete solid model; Little to guarantee that concrete is affected by friction force, make its degree of restraint low; Thereby guarantee that it has higher cracking resistance; Not easy fracture, distortion; Thereby make concrete product there is safety and quality assurance.
6, according to above-mentioned steps, comprehensively pass judgment on crack-resistant performance of concrete:
Concrete proportioning directly affects its cracking resistance; By above-mentioned steps, can realize and filter out the concrete of the most applicable manufacture seabed tunnel; Specifically, the concrete that has an excellent cracking resistance proportioning need to possess that temperature stress value is little, contraction strain amount is little, intensity and the speciality such as elastic modulus progress curve is large, degree of restraint is low.By said system detection method, can effectively detect concrete cracking resistance, the workmanship of raising, makes it meet the requirement of high-level subsea construction environment.
It is the server of Intel Xeon E3-1230v2 that central processing unit described in the present embodiment adopts model, and concrete configuration is as follows:
CPU core CPU core: Ivy Bridge;
CPU framework: 64;
Core amounts: four cores;
Operating power: 69W;
Manufacture craft: 22 nanometers;
Transistor: 1,400,000,000;
Number of threads: 8;
Cpu frequency dominant frequency: 3300MHz;
Maximum Turbo frequency: 3700MHz;
Frequency multiplication (doubly): 33 outer frequencies: 100;
CPU slot slot-type: LGA1155 pin;
Pin number: 1155pin;
Cpu cache L1 buffer memory: 128KB;
L2 buffer memory: 1MB;
L3 buffer memory: 8MB;
CPU technology Hyper-Threading: support;
Intel Virtualization Technology: support;
Memory Controller Hub DDR31333MHz, DDR31600MHz Turbo Boost technology.
Claims (10)
1. a crack-resistant performance of concrete systematization detection method, is characterized in that: described detection method comprises the following steps:
S1, detection concrete temperature stress parameter judge concrete factor of safety against cracking;
S2, detection concrete shrinkage strain value judge concrete contraction strain amount;
S3, detection concrete riper are set up intensity and elastic modulus progress curve;
S4, central processing unit analog computation go out concrete stress concentration point;
The friction factor judgement concrete degree of restraint of S5, detection concrete solid model;
S6, according to above-mentioned steps, comprehensively pass judgment on crack-resistant performance of concrete.
2. crack-resistant performance of concrete systematization detection method according to claim 1, is characterized in that: further comprising the steps of in described step S1:
S11, the concrete of many parts of different proportionings is prepared into many parts of concrete mortars;
S12, each concrete mortar is built respectively to temperature stress testing machine;
S13, control temperature stress testing machine detect respectively the temperature stress parameter of each concrete mortar;
S14, central processing unit go out each concrete temperature stress value according to the temperature stress calculation of parameter of each concrete mortar;
S15, central processing unit contrast according to default actual measurement tensile stress value and each concrete temperature stress value, and calculate each concrete factor of safety against cracking;
S16, filter out the concrete that meets factor of safety against cracking scope.
3. crack-resistant performance of concrete systematization detection method according to claim 2, is characterized in that: further comprising the steps of in described step S2:
S21, the concrete of many parts of different proportionings is prepared into many parts of concrete mortars by its water-cement ratio;
S22, by small circle ring, test the contraction strain that each concrete mortar is carried out in critical field and monitor;
S23, monitor each concrete cracking time, and filter out concrete not easy to crack;
S24, the concrete of many parts of different proportionings is prepared into many parts of concrete mortars;
S25, by each concrete mortar build respectively to dry shrink and self-constriction instrument in;
S26, measure concrete mortar amount of contraction at the appointed time;
S27, the concreting full size of many parts of different proportionings cun examination is watered to block models;
S28, by being arranged on full size cun examination, water strain transducer Real-Time Monitoring concrete on shrinkage characteristic point in block models in the values of shrinkage strain of each time point;
S29, central processing unit are analyzed concrete shrinkage strain trend according to each values of shrinkage strain, and are judged according to this concrete shrinkage dependent variable.
4. crack-resistant performance of concrete systematization detection method according to claim 3, is characterized in that: further comprising the steps of in described step S3:
Each temperature acquisition point set temperature sensor of S31, concrete component;
S32, central processing unit calculate the temperature data real-time monitoring draw the concrete riper curve of each temperature acquisition point of concrete;
In S33, testing laboratory, record intensity and elastic modulus that piece is watered in each concrete examination;
S34, central processing unit calculate concrete intensity and elastic modulus progress curve.
5. crack-resistant performance of concrete systematization detection method according to claim 4, is characterized in that: further comprising the steps of in described step S4:
S41, central processing unit are set up concrete mechanical model;
S42, on mechanical model, choose the point of application of acting force, and simulate application of force process;
S43, central processing unit carry out to the acting force of each point of application the stress value that superposition calculation draws each point of application, with this, find out concrete stress concentration point.
6. crack-resistant performance of concrete systematization detection method according to claim 5, is characterized in that: further comprising the steps of in described step S5:
S51, utilize gravity similarity criterion to manufacture concrete solid model;
S52, utilize the dilatory concrete solid model of lifting jack level and detect value of thrust;
S53, according to the weight of concrete solid model and value of thrust, calculate friction factor;
S54, by friction factor, judge concrete degree of restraint.
7. crack-resistant performance of concrete systematization detection method according to claim 6, it is characterized in that: described concrete solid model is that length is 1m, and the rectangular parallelepiped concrete block that bottom shape is identical with actual concrete, bottom support situation conforms to actual concrete.
8. crack-resistant performance of concrete systematization detection method according to claim 4, is characterized in that: central processing unit calculates the concrete riper curve of each temperature acquisition point of concrete according to following formula:
9. crack-resistant performance of concrete systematization detection method according to claim 4, is characterized in that: central processing unit calculates concrete intensity and elastic modulus progress curve according to following formula:
E＝E
0·(1-e
-at)
10. crack-resistant performance of concrete systematization detection method according to claim 3, is characterized in that: described strain transducer adopts flush type vibratory string strain transducer, and cun examination of described full size is watered block models length and is not less than 1m.
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| CN103852384A (en) * | 2014-03-11 | 2014-06-11 | 中交四航工程研究院有限公司 | Numeralization evaluation method for crack resistance of concrete |
| CN103852383A (en) * | 2014-03-11 | 2014-06-11 | 中交四航工程研究院有限公司 | Temperature stress test-based same condition simulated maintenance test method and inversion simulated maintenance test method and system |
| CN104764873A (en) * | 2015-03-11 | 2015-07-08 | 同济大学 | Analysis and evaluation method of shrinkage resistance performance of concrete |
| CN104807983A (en) * | 2015-04-23 | 2015-07-29 | 山东大学 | Determination method for elasticity modulus of early-stage concrete |
| CN105158447A (en) * | 2015-09-07 | 2015-12-16 | 中建三局集团有限公司 | Maturity-based concrete structure cracking risk evaluation method |
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