CN106841024A - A kind of crack-resistant performance of concrete appraisal procedure - Google Patents
A kind of crack-resistant performance of concrete appraisal procedure Download PDFInfo
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- CN106841024A CN106841024A CN201710218100.5A CN201710218100A CN106841024A CN 106841024 A CN106841024 A CN 106841024A CN 201710218100 A CN201710218100 A CN 201710218100A CN 106841024 A CN106841024 A CN 106841024A
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- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/004—Investigating resistance of materials to the weather, to corrosion, or to light to light
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Abstract
The invention discloses a kind of crack-resistant performance of concrete appraisal procedure, chosen according to material property investigate parameter first, investigating parameter is determined according to mixture different in concrete；Selected is investigated after parameter make many group models according to the investigation parameter chosen and carry out cracking test；There is crackle through the concrete sample after cracking test, measure and count total cracking number, the cracking length per crack and the maximum cracking width of each experiment；Average area of cracks and total area of cracks are calculated according to above-mentioned measured value；Total area of cracks according to each group model for investigating parameter different ratio judges crack-resistant performance of concrete, and the small then cracking resistance of total area of cracks is strong.Compared with prior art, the crack-resistant performance of concrete that it can more accurately describe crackle, obtains the double-admixing concrete mix proportion scheme of optimal cracking resistance.The present invention does not assign weight with the width of crackle, can evaluate the quality of the concrete quality for being divided into same weighted value originally.
Description
Technical field
The present invention relates to concrete quality assessment technique field, relate more specifically to a kind of crack-resistant performance of concrete assessment side
Method.
Background technology
Double-admixing concrete has been widely adopted in civil building field, is applied successfully to high ferro construction, city's political and ideological work
The numerous areas such as journey, reservoir construction and commerical ready-mixed concrete.Concrete is durable to be occurred to test the inner capacities for covering greatly, generally directed to
Some specific engineering is carried out, such as severe cold area winter construction, desert area high temperature difference operating condition, coastal area high humidity
Hypersaline environment, marine climate etc..By needing to carry out antifreezing test, carbonization test, sulfate resistance leaching experiment and resisting chloride ion penetration
The analysis experiment such as permeability test.Ensure that structure or the integrality of concrete members are to ensure that the qualified base of all kinds of long-term performance tests
Plinth, carries out experiment and has great importance, at present through entering to concrete frequently with flat board cracking resistance method to the cracking resistance of concrete
Row is evaluated.
Current test method carries out cracking resistance experiment using secure fit ratio, is assigned according to fracture width (d values)
Power, five gears are divided into by crack, are respectively d<0.5mm, 0.5≤d<1mm, 1≤d<2mm, 2≤d<3mm, d>3mm.For width very
For small crackle, bandpass is all not more than 0.5mm, and calculating crack index, the power of each numerical value are carried out according to above-mentioned standard
Weight values are the same, and the discrimination of fracture is not obvious, it is impossible to reflect the hole fragility energy of concrete well.
Therefore, for a person skilled in the art, a kind of cracking resistance for the less crackle of width how is designed
Method for analyzing performance, is the current technical issues that need to address.
The content of the invention
The present invention provides a kind of crack-resistant performance of concrete appraisal procedure, can be used in concrete and resists with the crackle of level width
Split performance evaluation.Concrete scheme is as follows：
A kind of crack-resistant performance of concrete appraisal procedure, including：
Chosen according to material property and investigate parameter；
Many group models are made according to the investigation parameter and carries out cracking test；
Total cracking number n, the cracking length l per crack and maximum cracking width w that measurement count is tested every time；
Calculate average area of cracks a and total area of cracks c；
Total area of cracks according to each group model judges crack-resistant performance of concrete, and the small then cracking resistance of total area of cracks is strong.
Alternatively, the cracking test is designed using flat band method, by shaping mortar injection in flat plate mold, by surface
Strike off；And fan is set is dried with to surface of test piece, surface of test piece is irradiated by tungsten lamp.
Alternatively, a number of reinforcing bar is set in flat board to increase the binding force of test specimen；Fan is with parallel to test specimen table
The constant wind speed in face blows；The timing from test specimen mix adds water the time, is carried out above test specimen after four hours by tungsten lamp
Irradiation.
Alternatively, the average area of cracks a is calculated according to below equation：
Wherein：WiBreadth Maximum, L for the i-th crackiIt is the length of the i-th crack, unit mm；N is single test face
Total cracking number in product；
Total area of cracks c is calculated according to below equation：
C=a × N.
Alternatively, variance analysis also is carried out including the total area of cracks c to test of many times, the investigation parameter pair chosen
The influence of crack-resistant performance of concrete stability.
Alternatively, the parameter of investigating includes the ratio of mineral blended amount volume, flyash and miberal powder and admixture poly- third
The quantity of alkene fiber.
The invention discloses a kind of crack-resistant performance of concrete appraisal procedure, chosen according to material property investigate parameter first,
Investigating parameter is determined according to mixture different in concrete；According to the investigation parameter system chosen after selected investigation parameter
Make many group models and carry out cracking test；There is crackle through the concrete sample after cracking test, measure and count every time
Total cracking number n of experiment, the cracking length l per crack and maximum cracking width w；Calculated according to above-mentioned measured value and averagely opened
Broken face accumulates a and total area of cracks c；Total area of cracks according to each group model for investigating parameter different ratio judges concrete anticracking
Performance, the small then cracking resistance of total area of cracks is strong.
The invention provides a kind of appraisal procedure of the crack-resistant performance of concrete suitable for crackle, with prior art phase
Than its crack-resistant performance of concrete that can more accurately describe crackle, the double-admixing concrete for obtaining optimal cracking resistance is matched somebody with somebody
Compare scheme.The present invention does not assign weight with the width of crackle, relative to traditional determination methods, can evaluate and be divided originally
It is the quality of the concrete quality of same weighted value.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
A kind of flow chart of crack-resistant performance of concrete appraisal procedure that Fig. 1 is provided for the present invention；
Fig. 2 is the graph of a relation between mineral admixture volume and total area of cracks；
Fig. 3 is the total area of cracks graph of a relation of flyash and miberal powder under different proportion；
Fig. 4 is the graph of a relation of fibers content and total area of cracks.
Specific embodiment
Core of the invention is to provide a kind of crack-resistant performance of concrete appraisal procedure, can be used in the same level width of concrete
Crackle Cracking Resistance Performance Analysis.
In order that those skilled in the art more fully understands technical scheme, below in conjunction with accompanying drawing and specifically
Implementation method, the crack-resistant performance of concrete appraisal procedure to the application is described in detail explanation.
As shown in figure 1, being a kind of flow chart of the crack-resistant performance of concrete appraisal procedure for providing of the invention.Including following step
Suddenly：S1, according to material property choose investigate parameter；It is there may be the material for influenceing on the cracking resistance of concrete to investigate parameter
Etc. factor；Then carry out step S2, many group models development cracking tests are made according to investigation parameter；Determine one per group model
Parameter is investigated as variable, this numerical value or ratio of investigating parameter is adjusted, therefore includes multiple independent moulds per group model
Type；Carried out after the completion of modelling step S3, measurement count every time experiment total cracking number n, per crack cracking length l and
Maximum cracking width w；The data obtained according to above-mentioned measurement carry out step S4, calculate average area of cracks a and total area of cracks
c；Finally carry out step S5, crack-resistant performance of concrete is judged according to total area of cracks of each group model, total area of cracks is small, resists
Fragility can be strong.
Appraisal procedure of the invention and not only by the width of crackle as the sole indicator for evaluating breaking resistance, but root
The area of cracks of crackle is calculated according to the width and length gauge of crackle, in this, as the index for evaluating cracking resistance quality, can be with area
Do not go out the breaking resistance quality that crackle is divided between the concrete proportioning of same gear, realize more fine division, difference
Go out the cracking resistance of crackle concrete.
In such scheme on the basis of, the cracking test is designed present invention preferably uses flat band method, flat band method is again
Referred to as flat board cracking resistance method, by shaping mortar injection in flat plate mold, then strikes off surface；And fan is set with to test specimen table
Face is dried, and surface of test piece is irradiated by tungsten lamp, by fan and the effect of tungsten lamp simulative natural air-drying.Certainly, flat board cracking resistance method
Outside, can also be tested using other methods, such as annulus cracking resistance method.
More detailed process is to pre-set two plate shaped grooves, to concrete perfusion mortar in two flat boards,
A number of reinforcing bar is set to increase the binding force of test specimen, using two flat board moulds of 440mm × 600mm × 25mm in flat board
Tool carries out mortar forming experiment, the reinforcing bar of cloth root root 44 in flat board, increases the binding force of test specimen.Fan is with parallel to surface of test piece
Constant wind speed blows；The timing from test specimen mix adds water the time, is irradiated above test specimen after four hours by tungsten lamp.
The timing since the time of adding water, by after 24 hours, observing flat test piece surface-crack distribution, and records fracture width situation,
Measure the crackle Breadth Maximum and length of each testpieces.
In any of the above-described technical scheme and its on the basis of being mutually combined, average area of cracks a is calculated according to below equation
Obtain：
Wherein：WiBreadth Maximum, L for the i-th crackiIt is the length of the i-th crack, unit mm；N is single test face
Total cracking number in product；
Total area of cracks c is calculated according to below equation：
C=a × N.
In order to determine the stability that every investigation parameter influences on crack-resistant performance of concrete, in addition to said process, also
Also include carrying out variance analysis to total area of cracks c of test of many times, repeat multiple identical experiment, with identical condition
Upper measurement obtains series of results, and each secondary data to identical investigation parameter same ratio carries out variance calculating, finally gives choosing
What is taken investigates the different influences to crack-resistant performance of concrete stability of parameter and investigation parameter ratio.
Specifically, three kinds of investigations parameters provided herein, investigate parameter include mineral blended amount volume, flyash and
The ratio of miberal powder and the quantity of admixture polypropylene fibre.Each factor is 3 levels, orthogonal test factor level table such as table 1
It is shown.
The orthogonal test factor level table of table 1
According to the quantity and the quantity of factor of investigating factor level, specially investigate three factors, each factor and investigate three
Individual level, so selection L9 (34) orthogonal design table, one group of benchmark group experiment is increased for convenience of contrast.
The orthogonal test optimization test scheme table of table 2
By above-mentioned test procedure, flat band method cracking test test result summary sheet as shown in table 3 can be obtained.
The flat band method cracking test test result summary sheet of table 3
Variance analysis is carried out to total area of cracks, flat board cracking test result analysis of variance table as shown in table 4 is obtained,
Can obtain selected three and investigate influence of the parameter to cracking of reinforced concrete：Selected three factors are to agent on crack resistance of concrete
Fragility has a significant effect；Influence degree order is as follows：Fibers content>Mineral admixture ratio>Mineral volume.Three factors with it is total
Relation difference between area of cracks is as shown in Figure 2, Figure 3 and Figure 4.From table 4 it can be found that total crackle area of A5 schemes most
It is small, and variance is minimum, so A5 schemes are optimal design.
The flat band method cracking test result analysis of variance table of table 4
As double-doped fiber concrete is in the extensive use in work China Democratic National Construction Association field, double-doped fiber concrete cracking resistance is proposed
Higher and higher requirement, therefore it is a key technology that cracking resistance optimization is carried out to double-doped fiber concrete, but existing comment
Valency method is not obvious enough for the discrimination of crackle concrete.Double-doped fiber suitable for crackle provided by the present invention is mixed
Solidifying soil cracking resistance optimization method, is estimated using total crackle area to the cracking resistance of concrete, can really be reflected
The cracking resistance of concrete, fast and accurately obtains the mix proportion scheme of the double-doped fiber concrete of crackle of optimal performance.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or uses the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle, can realize in other embodiments without departing from the spirit or scope of the present invention.Therefore, this hair
It is bright to be not intended to be limited to the embodiments shown herein, and be to fit to and principles disclosed herein and features of novelty phase
Consistent scope most wide.
Claims (6)
1. a kind of crack-resistant performance of concrete appraisal procedure, it is characterised in that including：
Chosen according to material property and investigate parameter；
Many group models are made according to the investigation parameter and carries out cracking test；
Total cracking number n, the cracking length l per crack and maximum cracking width w that measurement count is tested every time；
Calculate average area of cracks a and total area of cracks c；
Total area of cracks according to each group model judges crack-resistant performance of concrete, and the small then cracking resistance of total area of cracks is strong.
2. crack-resistant performance of concrete appraisal procedure according to claim 1, it is characterised in that described using flat band method design
Cracking test, by shaping mortar injection in flat plate mold, surface is struck off；And fan is set is dried with to surface of test piece,
Surface of test piece is irradiated by tungsten lamp.
3. crack-resistant performance of concrete appraisal procedure according to claim 2, it is characterised in that certain amount is set in flat board
Reinforcing bar increasing the binding force of test specimen；Fan is blown with the constant wind speed parallel to surface of test piece；Add from test specimen mix
Timing from the water time, is irradiated above test specimen after four hours by tungsten lamp.
4. the crack-resistant performance of concrete appraisal procedure according to any one of claims 1 to 3, it is characterised in that described average
Area of cracks a is calculated according to below equation：
Wherein：WiBreadth Maximum, L for the i-th crackiIt is the length of the i-th crack, unit mm；N is in single test area
Total cracking number；
Total area of cracks c is calculated according to below equation：
C=a × N.
5. crack-resistant performance of concrete appraisal procedure according to claim 4, it is characterised in that also including to test of many times
Total area of cracks c carries out variance analysis, influence of the investigation parameter chosen to crack-resistant performance of concrete stability.
6. crack-resistant performance of concrete appraisal procedure according to claim 4, it is characterised in that the investigation parameter includes ore deposit
The ratio of polymer blends amount volume, flyash and miberal powder and the quantity of admixture polypropylene fibre.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108132210A (en) * | 2017-12-25 | 2018-06-08 | 陈益德 | A kind of rapid detection method of emulsion paint paint film cracking |
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| CN202471499U (en) * | 2012-02-22 | 2012-10-03 | 北京中企卓创科技发展有限公司 | Concrete early-stage anti-cracking ability testing device |
| CN103245542A (en) * | 2013-05-16 | 2013-08-14 | 东南大学 | Test method of compound cracking of asphalt mixture |
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| CN202471499U (en) * | 2012-02-22 | 2012-10-03 | 北京中企卓创科技发展有限公司 | Concrete early-stage anti-cracking ability testing device |
| CN103245542A (en) * | 2013-05-16 | 2013-08-14 | 东南大学 | Test method of compound cracking of asphalt mixture |
Non-Patent Citations (3)
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| CN108132210A (en) * | 2017-12-25 | 2018-06-08 | 陈益德 | A kind of rapid detection method of emulsion paint paint film cracking |
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