CN104834771A - Method for establishing strength measurement curve of concrete with high-volume mineral admixtures - Google Patents
Method for establishing strength measurement curve of concrete with high-volume mineral admixtures Download PDFInfo
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Abstract
The invention discloses a method for establishing a strength measurement curve of concrete with high-volume mineral admixtures. The method comprises the following steps: making test blocks of the concrete with the high-volume mineral admixtures according to 30%-50% of mineral admixtures; performing nature conservation on the made test blocks; performing a rebound-value test on the test blocks so as to obtain a rebound value; obtaining the compressive strength through applying ultimate load of damage; measuring the carbonation depth of the test blocks so as to obtain a value of carbonation depth; and obtaining an equation of the strength measurement curve according to the rebound value, the compressive strength and the value of carbonation depth. The compressive strength of the concrete with the high-volume mineral admixtures can be detected according to the strength measurement curve. Compared with a unified strength measurement curve of China, the established rebounded strength measurement curve of the concrete with the high-volume mineral admixtures is higher in reliability and accuracy. The method disclosed by the present invention has significance in the quality detection and assessment of the concrete with the high-volume mineral admixtures.
Description
Technical field
The invention belongs to technical field of concrete, particularly relate to a kind of foundation of concrete crushing strength curve.
Background technology
In the world today, no matter be building structure or science of bridge building, concrete is all one of indispensable material, it is widely used, with a long history, not only can be widely used in industry and covil construction, waterwork and urban construction, but also the various structures of ocean development can be applied to.China is the country that concrete amount is maximum.According to " Chinese land resources publication in 2013 " display that Ministry of Land and Resources of China issues, China's cement annual production in 2013 has reached 24.2 hundred million tons, concrete annual production has surpassed 21.96 billion cubic meters, wherein commerical ready-mixed concrete reaches 11.7 billion cubic meters especially, year, amount of reinforcement reached 4000 tons, and cement and concrete annual production all rank first in the world.But, caused its premature failure and even destruction because concrete durability is bad in the last few years.The disaster that concrete structure quality defect causes happens occasionally, and result in great property loss and even the people's lives and property safety, and therefore strengthening and improving the Site Detection of xoncrete structure is the important means ensureing building structure security.
The detection of concrete structural strength damages detection technique and Dynamic Non-Destruction Measurement according to its principle unusual being divided into, but although wherein damage more intuitive and reliable its of detection technique test result can cause local failure to structure, corresponding repairing need be carried out by geodesic structure, be unfavorable for developing and maintaining of concrete component later stage, the Site Detection of concrete structural strength is all generally adopt Dynamic Non-Destruction Measurement, it has become one of the evaluation and analysis means of engineering accident, therefore, Dynamic Non-Destruction Measurement is in whole building operation, check and accept and all play an important role in use procedure.The Dynamic Non-Destruction Measurement of xoncrete structure refers to by not destroying xoncrete structure, act directly on and structure or component measure certain or some physical quantitys, and the detection technique of the indexs such as concrete intensity is inferred by the correlativity of these physical quantitys and intensity, comprise ultrasonic method, rebound method, Ultrasonic-rebound method Impact echo, radar method, infrared imaging method etc., wherein rebound method due to Instrument structure simple, instrument is easy to carry, method of testing is easy to grasp, detection efficiency is high, cost and expense are all comparatively cheap, the geomery of the measured object generally superiority such as unrestricted and being widely adopted, enter row stochastic because it is specially adapted to the intensity of working-yard to structural concrete, a large amount of inspections, by one of international academic community basic skills being known as concrete nondestructive testing, become the common method of on-the-spot structural concrete test and acceptance.Through the accumulation of years of researches and a large amount of laboratories and field data, establish unification of the motherland strength test curve, also form " concrete intensity with rebound method technical regulation " (JGJ/T23-2011), each department are mostly also studied to establish and are applicable to the local regional rebound Strength Curves detected, for the quality testing of entity project and evaluation provide foundation.
In recent years, along with the fast development of economy, the continuous propelling of urbanization process, modern building or structures present to high-rise, large across development trend.The requirement of these engineerings to intensity is also more and more higher, and normal concrete can not meet the needs of engineering gradually.Such as, some civilian installations in the process used as wave to the impact of extra large line and ocean platform, take off and land time percussive action etc. to runway, the concrete material that these requirement of engineering strength grades are higher.At present, the water-binder ratio used in many civil engineerings and oceanographic engineering is all less than 0.4; A large amount of carbon dioxide can be produced on the other hand owing to producing cement; in order to the angle from protection of the environment is considered; replace the cement of equivalent with high content mineral admixtures, reach identical effect equally, therefore high content mineral admixtures low water binder ratio concrete develops rapidly.Therefore the concrete quality testing of these high content mineral admixtures and evaluation are had great importance for ensureing that the safety of Structural Engineering is on active service.Explicitly point out in " concrete intensity with rebound method technical regulation " (JGJ/T 23-2011), unification of the motherland strength test curve is applicable to compressive strength for the normal concrete within the scope of (10.0-60.0) MPa.Obviously, along with popularization and the application of its technology, the applicability of unification of the motherland strength test curve reduces gradually for high content mineral admixtures low water binder ratio concrete and normal concrete difference.Be mainly manifested in the following aspects:
(1) high content mineral admixtures concrete component is complicated, often mixes a large amount of mineral admixtures in high content mineral admixtures concrete, causes its composition more complicated.In addition because the early stage carbonation depth of flyash is relatively very fast, the unified strength test curve in the whole nation is applied in the larger high content mineral admixtures concrete of doping quantity of fly ash, and its applicability is lower.
(2) the unified strength test curve in the whole nation is only applicable to the concrete of below 60MPa intensity, and the high performance concrete context of detection for 60MPa and above intensity thereof is then helpless.
(3) high content mineral admixtures concrete has the feature of large fluidity, requirement makes its slump often reach 140mm, even more than 200mm, is not inconsistent do requirement mobility with unification of the motherland strength test curve, and its influence degree exists more uncertainty.
Start with in the urgent need to the ultimate principle from checking spring range, seek the influence factor of high content mineral admixtures concrete surface layer hardness, and build on the quantitative relationship of concrete strength.This has important practical significance to the quality of control engineering quality, guard engineering accident, solution concrete strength problem, the development of promotion concrete, accurate evaluation engineering and engineering practical value.
Summary of the invention
Goal of the invention: the object of the invention is to set up high content mineral admixtures concrete strength-detecting curve, improves concrete crushing strength detection level, accurate evaluation construction quality.
The concrete technical scheme of the present invention is as follows:
The concrete strength test curve of high content mineral admixtures, institute's mineral admixture comprise flyash and or slag, the volume of mineral admixture is 30%-50%, it is characterized in that, the equation of described strength test curve is:
In formula:
-jGe Ce district concrete crushing strength scaled value, units MPa, is accurate to 0.01MPa;
R
m-survey district's average rebound number, be accurate to 0.1MPa;
D
m-survey the average carbonation depth value in district, unit mm.
Wherein flyash is I grade of flyash, and slag is S95 level.
Based on water-cement ratio be less than 0.35 low water binder ratio set up.
A method for building up for high content mineral admixtures concrete strength-detecting curve, is characterized in that, comprises the steps:
Step one, according to mineral volume 30%-50%, make high content mineral admixtures concrete test block:
Step 2, to make test block carry out maintenance;
Step 3, test block carried out to rebound value test and obtain rebound value;
Step 4, obtain compressive strength by applying breaking limit load;
The carbonation depth that step 5, measurement destroy test block obtains carbonation depth value;
Step 6, the rebound value according to measuring, compressive strength and carbonation depth value, obtain strength test curve equation:
In formula:
-jGe Ce district concrete crushing strength scaled value, units MPa, is accurate to 0.01MPa;
R
m-survey district's average rebound number, be accurate to 0.1MPa;
D
m-survey the average carbonation depth value in district, unit mm.
Compared with prior art, the present invention establishes the concrete strength test curve of large dosage mineral admixture, by this curve, directly can calculate the concrete compressive strength of different addition quantity admixture, and sample need not be made to the concrete of different addition quantity and test respectively, there is high reliability and accuracy.
Accompanying drawing explanation
Fig. 1 is the high content mineral admixtures concrete strength-detecting curve of foundation and comparing of unification of the motherland strength test curve.
Embodiment
Below in conjunction with specific embodiment, the present invention is elaborated:
The method for building up of high content mineral admixtures concrete strength-detecting curve of the present invention, comprises the steps:
The making of step one, high content mineral admixtures concrete test block, adopt P II 52.5 class g cement, granite stones that little wild field produces, continuous grading, maximum particle diameter is 20mm, fine aggregate is river sand, apparent density 2650kg/m
3, modulus of fineness is 2.96; Concrete mixing hydromining tap water.The match ratio of different intensity grades is designed according to the concrete feature high content mineral admixtures of high content mineral admixtures, using function additive, low water binder ratio, large fluidity.Test the length of time and make Y standard-sized test block for Concrete Design X of each strength grade.All test blocks of same proportioning will complete on the same day.
Step 2, test specimen use plastic film covering on concrete formation face after shaping completing, prevent the volatilization of concrete surface moisture, test block is also put into standard curing room maintenance one week by form removal after treating 24h, by the time after one week, test block is put into maintenance in physical environment, and be that isosceles triangle is stacked by test block, object is to fully simulate Practical Project environment.
Step 3, rebound value are tested, two opposite flanks of the reference block arriving design age are placed between pressing machine board, open machine and make it to the pressure of test block between 30KN-80KN, then use the rebound value of reisilometer horizontal survey reference block two relative side.Each side chooses 8 points uniformly, and the distance between every two points should be not less than 20mm, and will remove 3 maximal values and 3 minimum value in each test specimen 16 rebound values, remaining 10 numbers get its mean value R
a, what obtain is exactly the rebound value of this test block under certain length of time.
Step 4, strength test, continue to apply pressure to the test block on pressing machine subsequently, its breaking limit load is the cubic compressive strength of high performance concrete.
After step 5, carbonation depth pH-value determination pH, concrete sample compression test are destroyed, on the test block rupture surface of test rebound value, (powder and chip should eliminate) instills 1% phenolphthalein alcoholic solution (alcohol is absolute ethyl alcohol) immediately.When carbonization and non-carbonization distinct, carry out measuring its carbonation depth with carbonization measuring instrument.
Step 6, according to the rebound value measured, compression strength value and carbonation depth value, carry out Computer Analysis, adopts and return strength test curve equation
this area high content mineral admixtures concrete springback strength test curve is set up in programming matching.
Step 7, the curvilinear equation obtained are
In formula:
-jGe Ce district concrete crushing strength scaled value, units MPa, is accurate to 0.01MPa;
R
m-survey district's average rebound number, be accurate to 0.1MPa;
D
m-survey the average carbonation depth value in district, unit mm.
The high content mineral admixtures concrete strength-detecting curve that Fig. 1 is concrete carbonization depth to be set up when being 0 compares schematic diagram with unification of the motherland strength test curve, as shown in Figure 1, when carbonation depth is 0, high content mineral admixtures concrete strength-detecting curve is all the time higher than unification of the motherland strength test curve, and along with the increase of rebound value, the difference of the two has the trend increased gradually.
Claims (4)
1. the concrete strength test curve of high content mineral admixtures, mineral admixture used comprises flyash and slag, and the volume of mineral admixture is 30%-50%, it is characterized in that, the equation of described strength test curve is:
In formula:
-jGe Ce district concrete crushing strength scaled value;
R
m-survey district's average rebound number;
D
m-survey the average carbonation depth value in district.
2. high content mineral admixtures concrete strength-detecting curve as claimed in claim 1, it is characterized in that, it is characterized in that, flyash is I grade of flyash, and slag is S95 level.
3. high content mineral admixtures concrete strength-detecting curve as claimed in claim 1, is characterized in that, is less than that the low water binder ratio of 0.35 sets up based on water-cement ratio.
4. a method for building up for high content mineral admixtures concrete strength-detecting curve, is characterized in that, comprises the steps:
Step one, according to mineral volume 30%-50%, make high content mineral admixtures concrete test block;
Step 2, to make test block carry out natural curing;
Step 3, test block carried out to rebound value test and obtain rebound value;
Step 4, obtain compressive strength by applying breaking limit load;
The carbonation depth that step 5, measurement destroy test block obtains carbonation depth value;
Step 6, the rebound value according to measuring, compressive strength and carbonation depth value, obtain strength test curve equation;
In formula:
-jGe Ce district concrete crushing strength scaled value;
R
m-survey district's average rebound number;
D
m-survey the average carbonation depth value in district.
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Cited By (6)
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| CN110567812A (en) * | 2019-10-16 | 2019-12-13 | 廊坊市阳光建设工程质量检测有限公司 | method and instrument for comprehensively detecting concrete strength through resilience and direct drawing |
| CN111829869A (en) * | 2020-06-30 | 2020-10-27 | 元测检测技术（江苏）股份有限公司 | Special strength measuring curve for detecting concrete compressive strength by resilience method |
| CN112033810A (en) * | 2020-01-20 | 2020-12-04 | 廊坊市阳光建设工程质量检测有限公司 | Device and method for detecting compressive strength of concrete by cambered surface opposite compression method |
| CN112198026A (en) * | 2020-10-09 | 2021-01-08 | 廊坊市阳光建设工程质量检测有限公司 | Full-scale model of solid concrete strength measurement curve and preparation method and application thereof |
| CN112213217A (en) * | 2020-10-22 | 2021-01-12 | 廊坊市阳光建设工程质量检测有限公司 | Method for establishing compression strength curve of concrete detected by rebound method |
| CN112432872A (en) * | 2019-08-26 | 2021-03-02 | 朱韦光 | Ternary strength measurement curve of concrete |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112432872A (en) * | 2019-08-26 | 2021-03-02 | 朱韦光 | Ternary strength measurement curve of concrete |
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| CN112033810A (en) * | 2020-01-20 | 2020-12-04 | 廊坊市阳光建设工程质量检测有限公司 | Device and method for detecting compressive strength of concrete by cambered surface opposite compression method |
| CN111829869A (en) * | 2020-06-30 | 2020-10-27 | 元测检测技术（江苏）股份有限公司 | Special strength measuring curve for detecting concrete compressive strength by resilience method |
| CN112198026A (en) * | 2020-10-09 | 2021-01-08 | 廊坊市阳光建设工程质量检测有限公司 | Full-scale model of solid concrete strength measurement curve and preparation method and application thereof |
| CN112198026B (en) * | 2020-10-09 | 2022-05-27 | 廊坊市阳光建设工程质量检测有限公司 | Full-scale model of solid concrete strength measurement curve and preparation method and application thereof |
| CN112213217A (en) * | 2020-10-22 | 2021-01-12 | 廊坊市阳光建设工程质量检测有限公司 | Method for establishing compression strength curve of concrete detected by rebound method |
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