CN103513018B - 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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- CN103513018B CN103513018B CN201210593943.0A CN201210593943A CN103513018B CN 103513018 B CN103513018 B CN 103513018B CN 201210593943 A CN201210593943 A CN 201210593943A CN 103513018 B CN103513018 B CN 103513018B
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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, particularly relating to a kind of systematization detection method by detecting factor of safety against cracking, contraction strain amount, intensity and elastic modulus progress curve, stress concentration point and degree of restraint Comprehensive Evaluation crack-resistant performance of concrete.
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 structures affects by factors such as heavy in section, large volume, version and complicated construction techniques, 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, reasonable effective method must be taked in prefabricated construction process to evaluate cracking of reinforced concrete, optimizing the most reasonably match ratio and construction technology.
The domestic and international research of the Crack Control Technology for tunnel at present mainly concentrates on the concrete tunnel that dry-docking method makes, and for the concrete tunnel adopting the factory law prefabricated, concrete tunnel prefabricating technique still belongs to the first at home, can for using for reference without ripe construction technology experience, therefore think and be necessary that the xoncrete structure splitting resistance evaluation aspect to batch production is prefabricated conducts 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 " (JTJ202-2010) that such as water transport project was compiled and edit in 2010, this code is applicable to marine traffic engineering permanent hydraulic structure temperature cracks control of mass concrete design and construction.Choose from concrete raw material, the aspect such as mix-design, temperature control measures and construction time temperature monitoring all done detailed regulation, to water transport project mass concrete cracking main cause---temperature stress controls from source.But for precast concrete tunnel, the structures such as pier, pier stud, breastwork and caisson in the more traditional water transport project of its structure are more complicated, namely contain mass concrete, also contains the privileged sites such as heavy in section, many turnings.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 particular/special requirement, therefore only adopt in " code " just too unilateral to temperature stress control, 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, to start with comprehensive evaluation cracking of reinforced concrete from each influence factor.
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 object of Comprehensive Evaluation 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 set up intensity and elastic modulus progress curve;
S4, central processing unit analog computation go out concrete stress concentration point;
The friction factor of S5, detection concrete solid model judges concrete degree of restraint;
S6, according to above-mentioned steps Comprehensive Evaluation crack-resistant performance of concrete.
Further comprising the steps of in described step S1:
S11, the concrete of many parts of different ratio is prepared into many parts of concrete mortars;
S12, each concrete mortar is built in temperature stress testing machine respectively;
S13, control temperature pressure tester detect the temperature stress parameter of each concrete mortar respectively;
S14, central processing unit calculate each concrete temperature stress value according to the temperature stress parameter of each concrete mortar;
S15, central processing unit contrast according to the actual measurement tensile stress value preset and each concrete temperature stress value, and calculate each concrete factor of safety against cracking;
S16, filter out the concrete meeting factor of safety against cracking scope.
Further comprising the steps of in described step S2:
S21, the concrete of many parts of different ratio is prepared into many parts of concrete mortars by its water-cement ratio;
S22, by small circle ring test to each concrete mortar carry out in critical field contraction strain monitoring;
S23, monitor each concrete cracking time, and filter out concrete not easy to crack;
S24, the concrete of many parts of different ratio is prepared into many parts of concrete mortars;
S25, each concrete mortar is built in drying contraction and self-constriction instrument respectively;
S26, measure concrete mortar amount of contraction at the appointed time;
S27, block models is watered in the concreting full size of many parts of different ratio cun examination;
S28, water in block models shrink the values of shrinkage strain of the strain transducer Real-Time Monitoring concrete on unique point position at each time point by being arranged on full size cun examination;
S29, central processing unit analyze concrete shrinkage strain trend according to each values of shrinkage strain, and judge concrete shrinkage dependent variable according to this.
Further comprising the steps of in described step S3:
Each temperature acquisition point set temperature sensor of S31, concrete component;
The temperature data real-time monitored carries out calculating and draws the concrete riper curve of each temperature acquisition point of concrete by S32, central processing unit;
S33, in testing laboratory, record the examination of each concrete water intensity and the elastic modulus of block;
S34, central processing unit calculate concrete intensity and elastic modulus progress curve.
Further comprising the steps of in described step S4:
Concrete mechanical model set up by S41, central processing unit;
S42, on mechanical model, choose the point of application of acting force, and simulate 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, find out concrete stress concentration point with this;
Further comprising the steps of in described step S5:
S51, gravity similarity criterion is utilized to manufacture concrete solid model;
S52, lifting jack level is utilized to draw concrete solid model and detect value of thrust;
S53, calculate friction factor according to the weight of concrete solid model and value of thrust;
S54, judge concrete degree of restraint by friction factor.
Described concrete solid model is length is 1m, and the rectangular parallelepiped concrete block that bottom shape is identical with actual concrete, bottom support situation conforms to actual concrete.
Central processing unit goes out the concrete riper curve of each temperature acquisition point of concrete according to following formulae discovery:
Central processing unit goes out concrete intensity and elastic modulus progress curve according to following formulae discovery:
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 following advantage:
1, the present invention judges concrete factor of safety against cracking by detecting concrete temperature stress parameter, to ensure that screened crack-resistant performance of concrete meets the scope of factor of safety against cracking; Make selected concrete have high cracking resistance, thus make concrete product have safety and quality assurance.
2, the present invention judges concrete contraction strain amount by detecting concrete shrinkage strain value, little to ensure screened concrete shrinkage dependent variable; Selected concrete is made to have high cracking resistance, not easy fracture, distortion; Thus make concrete product have 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, intensity and the larger concrete of elastic modulus progress curve can be known, its concrete strength is higher, to ensure that screened concrete has enough intensity; Selected concrete is made to have high cracking resistance, not easy fracture, distortion; Thus make concrete product have 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 simulated, and the measure such as reinforcement, special curing anticracking is taked to these stress concentration points; Directive function is played, to ensure that concrete has enough intensity to concrete integral structure design; Not easy fracture, distortion; Thus make concrete product have safety and quality assurance.
5, the present invention is judged concrete degree of restraint by the friction factor detecting concrete solid model; To guarantee that concrete is subject to friction effects little, make its degree of restraint low; Thus ensure that it has higher cracking resistance; Not easy fracture, distortion; Thus make concrete product have 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 ratio is prepared into many parts of concrete mortars; Each alternative concrete is extremely in good condition by its proportioning trial mix, each making 60L concrete mortar.
Each concrete mortar is built respectively in the mould of temperature stress testing machine; Set by set testing program, regulate temperature stress testing machine operating system to test.
Control temperature pressure tester detects the temperature stress parameter of each concrete mortar respectively; Described temperature stress parameter comprises aquation temperature rise, temperature rising-time, thermal expansivity, breaking temperature etc.In the present embodiment, its aquation temperature rise (20 DEG C, 30 DEG C, 40 DEG C, 50 DEG C) and temperature rising-time (10h, 20h, 30h, 40h) scope are measured to different concrete, judge heating, temperature characteristic in concrete; Measure the characteristic such as thermal expansivity (around 1 × 10-5/ DEG C) and the strain of breaking temperature display concrete heat, heat sensitivity, judge that in mould, concrete surface is to concrete strain change, crack appearance point when unexpected temperature rise, temperature drop with this.Different molding temperatures can be set 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 DEG C ~-10 DEG C) impel it to rupture under the state of cooling rapidly, to determine the ultimate temperature that fracture occurs.
Central processing unit calculates each concrete temperature stress value according to the temperature stress parameter of each concrete mortar, and simulates Thermal Stress Field according to temperature stress value; MIDAS Civil Space Finite Element Analysis software is provided with in central processing unit in the present embodiment; The three-dimensional configuration of each concrete Thermal Stress Field is simulated, so that workmen's reference and analysis by this software computing; More directly perceived concrete.
Central processing unit contrasts according to the actual measurement tensile stress value preset and each concrete temperature stress value, and calculates each concrete factor of safety against cracking.
Can simulated condition be changed, 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.
The concrete meeting factor of safety against cracking scope is filtered out by above step; When factor of safety against cracking is less than 1.4, then belong to safe range.
The present invention judges concrete factor of safety against cracking by detecting concrete temperature stress parameter, to ensure that screened crack-resistant performance of concrete meets the scope of factor of safety against cracking; Make selected concrete have high cracking resistance, thus make concrete product have safety and quality assurance.
2, detect concrete shrinkage strain value and judge concrete contraction strain amount:
The concrete of many parts of different ratio is prepared into many parts of concrete mortars by its water-cement ratio; Put into the contraction strain monitoring that small circle ring carries out critical field, by small circle ring test, the contraction strain that each concrete mortar carries out in critical field is monitored; Its cracking time (be accurate to minute, 200min, 250min, 300min) is observed after concrete mortar solidifies;
Under different care environments, monitor each concrete cracking time respectively, 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 ratio is prepared into many parts of concrete mortars; Each concrete mortar is built respectively in the mould of drying contraction and self-constriction instrument.
Measure the amount of contraction of concrete mortar within the stipulated time (3d, 7d, 14d, 28d, 56d, 90d) (200 μ, 250 μ, 300 μ, 350 μ); In order to weigh concrete contraction strain characteristic; Unified measurement under equivalent environment, often organizes measurement three parts of concrete mortars.
The concrete of many parts of different ratio is built respectively a full size cun examination and water block models; The maintenance situation of block models is watered in this full size cun examination can the actual maintenance situation of simulation concrete, and can free setting according to actual needs.
Try to water in block models to shrink the values of shrinkage strain of the strain transducer Real-Time Monitoring concrete on unique point position at each time point by being arranged on full size cun; Described shrinkage characteristic point position refers to the position (being generally maximized surface length or Width) best embodying concrete shrinkage.
After having built, central processing unit carries out the contraction strain monitoring of frequency in " secondary/1 hour " left and right immediately, frequency suitably can be reduced to " secondary/2 ~ 4 hour " after about 1 week, central processing unit analyzes concrete shrinkage strain trend according to each values of shrinkage strain, and judges concrete shrinkage dependent variable according to this; Particularly judge the situation of concrete shrinkage characteristic point position tension or pressurized; The values of shrinkage strain arranged by the collection after some months judges contraction situation, when the strain value of strain transducer is more than 100 μ, should waters block models immediately carry out flaw detection to cun examination of each full size.Utilize in central processing unit and be provided with MIDAS Civil Space Finite Element Analysis software; Each concrete values of shrinkage strain change curve is simulated, so that workmen's reference and analysis by this software computing; 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, little to ensure screened concrete shrinkage dependent variable; Selected concrete is made to have high cracking resistance, not easy fracture, distortion; Thus make concrete product have 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 ratio is built each concrete component respectively, makes concrete examination and water block; Described temperature acquisition point refer to be positioned at concrete component geometric center or surface on have temperature acquisition be worth collection position.
In concreting process, the temperature data real-time monitored carries out calculating and draws the concrete riper curve of each temperature acquisition point of concrete by central processing unit; Central processing unit goes out the concrete riper curve of each temperature acquisition point of concrete according to following formulae discovery:
Intensity and elastic modulus that block is watered in the examination of each concrete is recorded in testing laboratory; If laboratory condition can accomplish that arbitrarily the curing temperature of block is watered in setting examination, can water each examination under block is put into different curing temperatures respectively and carry out maintenance, measure their intensity and elastic modulus respectively 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; Larger to represent concrete strength higher for intensity and elastic modulus progress curve.
Central processing unit goes out concrete intensity and elastic modulus progress curve according to following formulae discovery:
E＝E
0·(1-e
-at)
After concreting, the reisilometer concrete body structure surface intensity of field survey at the scene can be utilized, complementarity checking carried out to the intensity simulated and Flexible development curve.
Utilize in central processing unit and be provided with MIDAS Civil Space Finite Element Analysis software; Each concrete intensity and elastic modulus progress curve is simulated, so that workmen's reference and analysis by this software computing; 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, intensity and the larger concrete of elastic modulus progress curve can be known, its concrete strength is higher, to ensure that screened concrete has enough intensity; Selected concrete is made to have high cracking resistance, not easy fracture, distortion; Thus make concrete product have safety and quality assurance.
4, central processing unit analog computation goes out concrete stress concentration point:
The MIDAS Civil Space Finite Element Analysis software in central processing unit is utilized to set up concrete mechanical model; Mechanical characteristic, the restraint condition of this mechanical model conform to the situation of actual concrete in building as far as possible.
Mechanical model is chosen the point of application of acting force, and simulates force process; Specifically: on 3 ~ 4 faces that mechanical model is different, respectively choose an application point, this application point acts on the acting force of 4 constant magnitude of vertical direction each other respectively, and carries 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, finds out concrete stress concentration point with this; Central processing unit simulate different operating mode calculate each operating mode respectively under the stress value of each application point; The stress absolute value of each application point is superposed respectively, finds out several application points that stress value is maximum, namely assert that these application points are the stress concentration point easily formed 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 simulated, then the measure such as reinforcement, special curing anticracking is taked to these stress concentration points; Directive function is played, to ensure that concrete has enough intensity to concrete integral structure design; Not easy fracture, distortion; Thus make concrete product have safety and quality assurance.
5, the friction factor detecting concrete solid model judges concrete degree of restraint:
Gravity similarity criterion is utilized to manufacture concrete solid model;
Utilize and draw concrete solid model with the lifting jack level of force measuring function and detect value of thrust;
Friction factor is calculated according to the weight of concrete solid model and value of thrust;
Friction factor
Concrete degree of restraint is judged by friction factor; μ is larger, retrains larger.
Described concrete solid model is length is 1m, and the rectangular parallelepiped concrete block that bottom shape is identical with actual concrete, bottom support situation conforms to actual concrete.
The present invention is judged concrete degree of restraint by the friction factor detecting concrete solid model; To guarantee that concrete is subject to friction effects little, make its degree of restraint low; Thus ensure that it has higher cracking resistance; Not easy fracture, distortion; Thus make concrete product have safety and quality assurance.
6, according to above-mentioned steps Comprehensive Evaluation crack-resistant performance of concrete:
Concrete proportioning directly affects its cracking resistance; Can be realized by above-mentioned steps and filter out the concrete of the most applicable manufacture seabed tunnel; Specifically, the concrete with excellent cracking resistance proportioning needs 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.Can effectively detect concrete cracking resistance by said system detection method, the workmanship of raising, make it meet the requirement of high-level subsea construction environment.
Central processing unit employing model described in the present embodiment is the server of Intel Xeon E3-1230v2, and concrete configuration is as follows:
CPU core CPU core: Ivy Bridge;
CPU architecture: 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 is frequently outer: 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 (8)
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 set up intensity and elastic modulus progress curve;
S4, central processing unit analog computation go out concrete stress concentration point;
The friction factor of S5, detection concrete solid model judges concrete degree of restraint;
S6, according to above-mentioned steps Comprehensive Evaluation 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 ratio is prepared into many parts of concrete mortars;
S12, each concrete mortar is built in temperature stress testing machine respectively;
S13, control temperature pressure tester detect the temperature stress parameter of each concrete mortar respectively;
S14, central processing unit calculate each concrete temperature stress value according to the temperature stress parameter of each concrete mortar;
S15, central processing unit contrast according to the actual measurement tensile stress value preset and each concrete temperature stress value, and calculate each concrete factor of safety against cracking;
S16, filter out the concrete meeting 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 ratio is prepared into many parts of concrete mortars by its water-cement ratio;
S22, by small circle ring test to each concrete mortar carry out in critical field contraction strain monitoring;
S23, monitor each concrete cracking time, and filter out concrete not easy to crack;
S24, the concrete of many parts of different ratio is prepared into many parts of concrete mortars;
S25, each concrete mortar is built in drying contraction and self-constriction instrument respectively;
S26, measure concrete mortar amount of contraction at the appointed time;
S27, block models is watered in the concreting full size of many parts of different ratio cun examination;
S28, water in block models shrink the values of shrinkage strain of the strain transducer Real-Time Monitoring concrete on unique point position at each time point by being arranged on full size cun examination;
S29, central processing unit analyze concrete shrinkage strain trend according to each values of shrinkage strain, and judge concrete shrinkage dependent variable according to this.
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;
The temperature data real-time monitored carries out calculating and draws the concrete riper curve of each temperature acquisition point of concrete by S32, central processing unit;
S33, in testing laboratory, record the examination of each concrete water intensity and the elastic modulus of block;
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:
Concrete mechanical model set up by S41, central processing unit;
S42, on mechanical model, choose the point of application of acting force, and simulate 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, find out concrete stress concentration point with this.
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, gravity similarity criterion is utilized to manufacture concrete solid model;
S52, lifting jack level is utilized to draw concrete solid model and detect value of thrust;
S53, calculate friction factor according to the weight of concrete solid model and value of thrust;
S54, judge concrete degree of restraint by friction factor.
7. crack-resistant performance of concrete systematization detection method according to claim 6, it is characterized in that: described concrete solid model is 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 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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| CN103852384B (en) * | 2014-03-11 | 2016-08-31 | 中交四航工程研究院有限公司 | A kind of concrete capacity against cracking quantizes evaluation methodology |
| CN103852383B (en) * | 2014-03-11 | 2016-05-04 | 中交四航工程研究院有限公司 | Based on same condition simulation maintenance test method and inverse modeling maintenance test method and the system of temperature stress test |
| CN104764873B (en) * | 2015-03-11 | 2016-04-20 | 同济大学 | A kind of assay method of agent on crack resistance of concrete shrinkage |
| CN104807983A (en) * | 2015-04-23 | 2015-07-29 | 山东大学 | Determination method for elasticity modulus of early-stage concrete |
| CN105158447B (en) * | 2015-09-07 | 2017-07-21 | 中建三局集团有限公司 | A kind of concrete structure cracking risk appraisal procedure based on maturity |
| CN108362580B (en) * | 2018-01-22 | 2020-12-04 | 武汉路通市政工程质量检测中心 | Method for detecting concrete strength of structural solid by impact elastic wave method |
| CN109444387B (en) * | 2018-10-24 | 2021-03-23 | 北京航空航天大学 | Method for realizing engineering restraint degree of mass concrete |
| CN109738618B (en) * | 2018-12-06 | 2021-07-06 | 同济大学 | Preliminary early warning method for plastic shrinkage cracking of cement-based material |
| CN110108864B (en) * | 2019-05-21 | 2022-01-28 | 湖南城市学院 | Nondestructive testing system and method for prestressed concrete beam |
| CN110188464B (en) * | 2019-05-30 | 2021-02-12 | 中国水利水电科学研究院 | Method for determining water cooling control curve in concrete arch dam construction period |
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