CN104834771B - The method for building up of high content mineral admixtures concrete strength-detecting curve - Google Patents
The method for building up of high content mineral admixtures concrete strength-detecting curve Download PDFInfo
- Publication number
- CN104834771B CN104834771B CN201510198301.4A CN201510198301A CN104834771B CN 104834771 B CN104834771 B CN 104834771B CN 201510198301 A CN201510198301 A CN 201510198301A CN 104834771 B CN104834771 B CN 104834771B
- Authority
- CN
- China
- Prior art keywords
- concrete
- strength
- high content
- mineral admixtures
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses the strength test curve of high content mineral admixtures concrete and method for building up, wherein method for building up comprises the following steps：According to mineral volume 30% 50%, high content mineral admixtures concrete test block is made；Test block to making carries out natural curing；Rebound value is carried out to test block to test to obtain rebound value；Compression strength is obtained by applying limit of rupture load；The carbonation depth that measurement destroys test block obtains carbonation depth value；According to the rebound value of measurement, compression strength and carbonation depth value, strength test curve equation is obtained.The compression strength of high content mineral admixtures concrete can be detected according to this strength test curve.Compared to the strength test curve of unification of the motherland, the high content mineral admixtures concrete springback strength test curve of foundation has more reliability and accuracy.This quality testing and evaluation for high content mineral admixtures concrete has great importance.
Description
Technical field
The invention belongs to technical field of concrete, more particularly to a kind of foundation of concrete crushing strength curve.
Background technology
In the world today, either building structure or science of bridge building, concrete is all one of indispensable material, its
It is widely used, is with a long history, not only can be widely applied to industry and civil buildings, waterwork and urban construction, but also
It can apply to the various structures of ocean development.China is the most country of concrete amount.According to China's land resources
Portion's issue《Chinese land resources publication in 2013》It has been shown that, China's cement annual production in 2013 is up to 24.2 hundred million tons, concrete
Annual production has surpassed 21.96 billion cubic meters, and wherein commerical ready-mixed concrete is even more to have reached 11.7 billion cubic meters, year amount of reinforcement reached
4000 tons, the annual production of cement and concrete ranks first in the world.However, made in the last few years because concrete durability is bad
Into its premature failure or even destruction.Disaster caused by concrete structure quality defect happens occasionally, and result in great property
Loss or even the people's lives and property safety, therefore it is to ensure building structure to strengthen and improve to the Site Detection of concrete structure
The important means of thing security.
The detection of concrete structural strength according to its principle it is unusual be divided into damage detection technique and Non-Destructive Testing skill
Art, although wherein local failure can be caused to structure by damaging more intuitive and reliable its of detection technique test result, it is tested knot
Structure need to be repaired accordingly, be unfavorable for developing and maintaining for concrete component later stage, the Site Detection one of concrete structural strength
As be all to use non-destructive testing technology, its evaluation as engineering accident and one of analysis means, therefore, non-destructive testing technology
All played an important role during whole building construction, examination and use.The non-destructive testing technology of concrete structure
Refer to by concrete structure without destroy, act directly on structure or component and determine some or some physical quantitys, and
The detection technique of the indexs such as the intensity of concrete is speculated by the correlation of these physical quantitys and intensity, including ultrasonic method, returned
Bullet method, Ultrasonic-rebound method Impact echo, radar method, infrared imaging method etc., wherein rebound method are because Instrument structure is simple, instrument
Easy to carry, method of testing is easy to grasp, detection efficiency is high, cost and expense are all more cheap, measured object geomery one
As the superiority such as unrestricted and be widely adopted, because it is carried out especially suitable for job site to the intensity of structural concrete
It is random, substantial amounts of to examine, one of basic skills of concrete nondestructive testing is known as by international academic community, turns into live knot
Structure concrete inspection and the common method checked and accepted.By the accumulation of years of researches and substantial amounts of laboratory and field data,
Unification of the motherland strength test curve has been set up, also form《Concrete intensity with rebound method technical regulation》(JGJ/T23-
2011), mostly also research establishes the regional rebound Strength Curves for being adapted to local detection for each department, is that the quality of entity project is examined
Survey and provide foundation with evaluation.
In recent years, as the fast development of economy, the continuous propulsion of urbanization process, modern building or structures are presented
Go out to high level, greatly across development trend.Also more and more higher, normal concrete can not gradually expire for requirement of these engineerings to intensity
The needs of sufficient engineering.Such as some civilian installations during use such as impact of the wave to extra large line and ocean platform, aircraft
To percussion of runway etc., the higher concrete material of these requirement of engineering strength grades during takeoff and landing.At present, permitted
The water-binder ratio used in more civil engineerings and ocean engineering is respectively less than 0.4；On the other hand because production cement can produce
Substantial amounts of carbon dioxide, in order to from the point of view of environmental protection, the cement of equivalent be substituted with high content mineral admixtures, equally
Reach identical effect, therefore high content mineral admixtures low water binder ratio concrete develops rapidly.Therefore to these large dosages
Safety military service of the quality testing and evaluation of mineral admixture concrete for ensureing Structural Engineering has great importance.《Return
Bullet method detects concrete crushing strength technical regulation》Explicitly pointed out in (JGJ/T 23-2011), unification of the motherland strength test curve is applicable
In compression strength be (10.0-60.0) MPa in the range of normal concrete.High content mineral admixtures low water binder ratio concrete with
Normal concrete difference is obvious, and with the popularization and application of its technology, the applicability of unification of the motherland strength test curve gradually reduces.It is main
Show the following aspects：
(1) high content mineral admixtures concrete component is complicated, and often incorporation is a large amount of in high content mineral admixtures concrete
Mineral admixture, cause its composition more complicated.Additionally due to flyash early stage carbonation depth is relatively fast, the whole nation is unified
Strength test curve is applied in the larger high content mineral admixtures concrete of doping quantity of fly ash, and its applicability is relatively low.
(2) the unified strength test curve in the whole nation is only applicable to the concrete of below 60MPa intensity, and for 60MPa and its more than
The high performance concrete context of detection of intensity is then helpless.
(3) high content mineral admixtures concrete has the characteristics of large fluidity, it is desirable to its slump is often reached
Mobility is not required in 140mm, or even more than 200mm, with unification of the motherland strength test curve and is not inconsistent, its influence degree is present
More uncertainty.
There is an urgent need to start with from the general principle of checking spring range, high content mineral admixtures concrete surface layer hardness is sought
Influence factor, and build on the quantitative relationship of concrete strength.This will be mixed to control construction quality, guard engineering accident, solution
Coagulate native strength problem, promote concrete development, the quality of accurate evaluation engineering to have important practical significance and Practical valency
Value.
The content of the invention
Goal of the invention：It is an object of the invention to establish high content mineral admixtures concrete strength-detecting curve, coagulation is improved
Native compression strength detection level, accurate evaluation construction quality.
Concrete technical scheme of the present invention is as follows：
The strength test curve of high content mineral admixtures concrete, institute's mineral admixture include flyash and/or slag, mineral
The volume of admixture is 30%-50%, it is characterised in that the equation of the strength test curve is：
In formula：- j-th surveys area's concrete crushing strength scaled value, units MPa, is accurate to 0.01MPa；
Rm- area's average rebound number is surveyed, it is accurate to 0.1MPa；
Dm- survey the average carbonation depth value in area, unit mm.
Wherein flyash is I grade of flyash, and slag is S95 levels.
What the low water binder ratio based on water-cement ratio less than 0.35 was established.
A kind of method for building up of high content mineral admixtures concrete strength-detecting curve, it is characterised in that comprise the following steps：
Step 1: according to mineral volume 30%-50%, high content mineral admixtures concrete test block is made：
Step 2: the test block to making conserves；
Test to obtain rebound value Step 3: carrying out rebound value to test block；
Step 4: obtain compression strength by applying limit of rupture load；
Step 5: the carbonation depth that measurement destroys test block obtains carbonation depth value；
Step 6: according to the rebound value of measurement, compression strength and carbonation depth value, strength test curve equation is obtained：
In formula：- j-th surveys area's concrete crushing strength scaled value, units MPa, is accurate to 0.01MPa；
Rm- area's average rebound number is surveyed, it is accurate to 0.1MPa；
Dm- survey the average carbonation depth value in area, unit mm.
Compared with prior art, the present invention establishes the strength test curve of large dosage mineral admixture concrete, passes through the song
Line, the compression strength of different addition quantity admixture concrete can be directly calculated, and without sample is made to the concrete of different addition quantity
Tested respectively, there is high reliability and accuracy.
Brief description of the drawings
Fig. 1 is the comparison for the high content mineral admixtures concrete strength-detecting curve and unification of the motherland strength test curve established.
Embodiment
The present invention is elaborated with reference to specific embodiment：
The method for building up of high content mineral admixtures concrete strength-detecting curve of the present invention, comprises the following steps：
Step 1: the making of high content mineral admixtures concrete test block, using II 52.5 grades of water of P of small wild field production
Mud, granite stones, continuous grading, maximum particle diameter are that 20mm, fine aggregate are river sand, apparent density 2650kg/m3, modulus of fineness
For 2.96；Concrete mixing water uses running water.Blended according to large dosage mineral the characteristics of high content mineral admixtures concrete
Material, the match ratio for designing using function additive, low water binder ratio, large fluidity different intensity grades.Each strength grade
The experiment age of Concrete Design X and make Y standard-sized test blocks.All test blocks of same proportioning will be same
It is completed.
Step 2: test specimen is covered on concrete formation face after the completion of shaping with film, concrete surface moisture is prevented
Volatilization, treat after 24h form removal and test block be put into standard curing room to conserve one week, test block is put into nature after one week
Conserved in environment, and test block is stacked in isosceles triangle, in order to fully simulation Practical Project environment.
Step 3: rebound value is tested, two opposite flanks of the reference block for reaching design age are placed in into forcing press holds
Between plate, opening machine makes its pressure to test block between 30KN-80KN, then with reisilometer horizontal survey reference block two
The rebound value of opposite flank.The distance between 8 points, each two point are uniformly chosen in each side should be not less than 20mm, each
3 maximums and 3 minimum values are removed in individual 16 rebound values of test specimen, remaining 10 numbers take its average value Ra, obtain
It is exactly rebound value of the test block under certain age.
Step 4: strength test, then continues to pressure to the test block on forcing press, its limit of rupture load is high property
The cubic compressive strength of energy concrete.
Step 5: after carbonation depth value measure, concrete sample compression test are destroyed, immediately in the test block of test rebound value
(powder and chip should eliminate) instills 1% phenolphthalein alcoholic solution on the plane of disruption (alcohol is absolute ethyl alcohol).When being carbonized and non-carbon
When changing distinct, its carbonation depth is measured with carbonization measuring instrument.
Step 6: according to the rebound value of measurement, compression strength value and carbonation depth value, computer analysis is carried out, used
Return strength test curve equationThis area high content mineral admixtures coagulation is established in programming fitting
Native rebound Strength Curves.
Step 7: obtained curvilinear equation is
In formula：- j-th surveys area's concrete crushing strength scaled value, units MPa, is accurate to 0.01MPa；
Rm- area's average rebound number is surveyed, it is accurate to 0.1MPa；
Dm- survey the average carbonation depth value in area, unit mm.
Fig. 1 is that the high content mineral admixtures concrete strength-detecting curve established when concrete carbonization depth is 0 is united with country
The comparison schematic diagram of one strength test curve, as shown in Figure 1, when carbonation depth is 0, high content mineral admixtures concrete strength-measuring is bent
Line is consistently higher than unification of the motherland strength test curve, and with the increase of rebound value, the difference between the two has the trend gradually increased.
Claims (2)
1. a kind of method for building up of high content mineral admixtures concrete strength-detecting curve, it is characterised in that comprise the following steps：
Step 1: according to mineral volume 30%-50%, high content mineral admixtures concrete test block is made；
Step 2: the test block to making carries out natural curing；
Test to obtain rebound value Step 3: carrying out rebound value to test block；
Step 4: obtain compression strength by applying limit of rupture load；
Step 5: the carbonation depth that measurement destroys test block obtains carbonation depth value；
Step 6: according to the rebound value of measurement, compression strength and carbonation depth value, strength test curve equation is obtained；
<mrow>
<msubsup>
<mi>f</mi>
<mrow>
<mi>c</mi>
<mi>u</mi>
<mo>,</mo>
<mi>j</mi>
</mrow>
<mi>c</mi>
</msubsup>
<mo>=</mo>
<mn>0.049858</mn>
<msup>
<msub>
<mi>R</mi>
<mi>m</mi>
</msub>
<mn>1.861617</mn>
</msup>
<msup>
<mn>10</mn>
<mrow>
<mo>-</mo>
<mn>0.09947</mn>
<mi>D</mi>
<mi>m</mi>
</mrow>
</msup>
</mrow>
In formula：- j-th surveys area's concrete crushing strength scaled value；
Rm- survey area's average rebound number；
Dm- survey the average carbonation depth value in area.
2. the method for building up of high content mineral admixtures concrete strength-detecting curve according to claim 1, it is characterised in that
Mineral admixture includes flyash and slag, and flyash is I grade of flyash, and slag is S95 levels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510198301.4A CN104834771B (en) | 2015-04-23 | 2015-04-23 | The method for building up of high content mineral admixtures concrete strength-detecting curve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510198301.4A CN104834771B (en) | 2015-04-23 | 2015-04-23 | The method for building up of high content mineral admixtures concrete strength-detecting curve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104834771A CN104834771A (en) | 2015-08-12 |
| CN104834771B true CN104834771B (en) | 2018-03-30 |
Family
ID=53812655
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510198301.4A Active CN104834771B (en) | 2015-04-23 | 2015-04-23 | The method for building up of high content mineral admixtures concrete strength-detecting curve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104834771B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112432872A (en) * | 2019-08-26 | 2021-03-02 | 朱韦光 | Ternary strength measurement curve of concrete |
| CN110567812B (en) * | 2019-10-16 | 2024-08-06 | 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 rebound direct pulling |
| CN111141610A (en) * | 2020-01-20 | 2020-05-12 | 廊坊市阳光建设工程质量检测有限公司 | Device for detecting compressive strength of concrete by using counter-pressure method and application method thereof |
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539262A (en) * | 2011-12-23 | 2012-07-04 | 舟山市博远科技开发有限公司 | High strength concrete resiliometer and use method thereof |
| CN104251882A (en) * | 2014-09-30 | 2014-12-31 | 湖南理工学院 | Establishment method of concrete compression strength curve |
-
2015
- 2015-04-23 CN CN201510198301.4A patent/CN104834771B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539262A (en) * | 2011-12-23 | 2012-07-04 | 舟山市博远科技开发有限公司 | High strength concrete resiliometer and use method thereof |
| CN104251882A (en) * | 2014-09-30 | 2014-12-31 | 湖南理工学院 | Establishment method of concrete compression strength curve |
Non-Patent Citations (3)
| Title |
|---|
| 早龄期磨细矿渣混凝土专用测强曲线的建立;陈萌 等;《武汉理工大学学报》;20071031;第29卷;全文 * |
| 矿物掺合料混凝土早龄期回弹法测强曲线的试验研究;杨永敢 等;《硅酸盐通报》;20150331;第34卷(第3期);全文 * |
| 粉煤灰混凝土早龄期回弹法测强曲线的试验研究;胡晓鹏 等;《混凝土》;20111231(第261期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104834771A (en) | 2015-08-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104834771B (en) | The method for building up of high content mineral admixtures concrete strength-detecting curve | |
| Tibbetts et al. | Relating water permeability to electrical resistivity and chloride penetrability of concrete containing different supplementary cementitious materials | |
| Jin et al. | Fractal analysis of effect of air void on freeze–thaw resistance of concrete | |
| Lamond et al. | Significance of tests and properties of concrete and concrete-making materials | |
| Reiterman et al. | Crystalline coating and its influence on the water transport in concrete | |
| CN105300801B (en) | The selfreparing effect evaluation method of self-repairing cement-base material | |
| Lu et al. | Study on the effect of chloride ion on the early age hydration process of concrete by a non-contact monitoring method | |
| Homayoonmehr et al. | Predicting the chloride diffusion coefficient and surface electrical resistivity of concrete using statistical regression-based models and its application in chloride-induced corrosion service life prediction of RC structures | |
| Yang et al. | Effect of concentration and suspension agent (HPMC) on properties of coal gangue and fly ash cemented filling material | |
| Malakooti | Investigation of concrete electrical resistivity as a performance based test | |
| Zhou et al. | Brazilian splitting testing of the restorative properties of eco-friendly epoxy resin on cracked granite samples with various widths | |
| Liu et al. | Quality evaluation of lightweight cellular concrete by an ultrasound-based method | |
| Mohammadi | Investigation on the use of crumb rubber concrete (CRC) for rigid pavements | |
| Shang et al. | Study on Strength and Ultrasonic Velocity of Air‐Entrained Concrete and Plain Concrete in Cold Environment | |
| Malakooti et al. | Evaluating electrical resistivity as a performance based test for Utah bridge deck concrete | |
| Yan et al. | Comparison of evaluation tests for compressive strength of structural concrete | |
| Kevern et al. | Evaluation of surface resistivity for concrete quality assurance in Missouri | |
| Mendes et al. | Estimation of electrical resistivity of concrete with blast-furnace slag | |
| Chen et al. | Pore size distribution of cement mortar prepared with crushed limestone sand | |
| CN109283314B (en) | Method for evaluating relative compactness of calcareous soil based on light dynamic penetration test indexes | |
| Grantham | Diagnosis, inspection, testing and repair of reinforced concrete structures | |
| Yusuf et al. | Correlation of pundit ultrasonic pulse velocity with strength of palm kernel shell concrete | |
| Celerinos et al. | Influence of seawater exposure at the splash zone on the reliability of the rebound hammer test in estimating concrete compressive strength | |
| Žvironaitė et al. | The Investigation of Alkali–Silica Reactivity (ASR) of Lithuanian Aggregates | |
| Nemes et al. | Non-destructive strength estimation of lightweight aggregate concretes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |