CN107621403A - A kind of acquisition buried concrete true mechanical property and method of this structure after by sulfate attack - Google Patents
A kind of acquisition buried concrete true mechanical property and method of this structure after by sulfate attack Download PDFInfo
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- CN107621403A CN107621403A CN201710997210.6A CN201710997210A CN107621403A CN 107621403 A CN107621403 A CN 107621403A CN 201710997210 A CN201710997210 A CN 201710997210A CN 107621403 A CN107621403 A CN 107621403A
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Abstract
The invention belongs to field of civil engineering,Specifically disclose a kind of method for obtaining buried concrete true mechanical property and this structure after by sulfate attack,Sample after being weathered first to different erosion ages is layered along the direction of its depth of erosion,It is assumed that each layer of sulfate ion concentration is uniform,Corrode the load strain curve of the test group sample of age and the load strain curve with the sample that do not weathered in age control group,Pass through the Method of Seeking Derivative of Lagrange interpolation polynomial,Obtain the rigidity strain curve of concrete,Stiffness formula based on concrete,Obtain the relation curve of certain layer concrete,Finally by numerical integration,Try to achieve the stress strain curve under different sulfate ion concentrations,This method is easy to operate,Calculate simple,The bearing capacity of the concrete component after weathering can accurately be estimated,And it is assessed and safeguarded,Ensure safe for operation,And then extend its service life.
Description
Technical field
The invention belongs to technical field of civil engineering, and in particular to it is true after by sulfate attack that one kind obtains buried concrete
The method of real mechanical property and this structure.
Background technology
It will all be changed by its constituent of the concrete of sulfate attack and microstructure, this necessarily causes concrete
The change of mechanical property, and strain-stress relation of the concrete under uniaxial compression state, can reflect comprehensively concrete it is each by
The deformation characteristicses and destructive process in power stage, include important mechanical performance index.
Sulfate intrusion concrete is from outward appearance to inner essence gradually carried out, and peripheral concrete often weathers the most seriously, and
The concrete of core layer does not almost weather, causes all to deposit along the erosion degree of depth direction, chemical constituent and mechanical property
In gradient.The often average intensity value in a comprehensive significance that current achievement in research obtains, it is difficult to reflect peripheral coagulation
The definite sulfate degree of injury of soil.The Strength Changes result determined simultaneously necessarily has stronger sample dimensions dependence.
The inhomogeneities of this erosion degree can be also exaggerated because of dimensional effect and in actual concrete structure so that laboratory obtains
Value of the attenuation law in engineering in practice to sulfate attack mechanical performance of concrete is limited.At present on concrete
Many deficiencies also be present by the research of sulfate attack, it is concluded that should leave a question open in practical implementation.
To the in-service concrete structure by sulfate attack, corrosion concrete constitutive model is that the concrete structure is carried out
Residual life evaluation and the basis of fail-safe analysis；To the concrete structure that can suffer from sulfate attack yet to be built, corrode mixed
Solidifying soil borne pathogens are also the necessary basis for carrying out its life cycle management performance evaluation.Therefore, to sulfate attack concrete
Constitutive relation research it is significant.
The content of the invention
A kind of acquisition buried concrete of present invention offer true mechanical property and method of this structure after by sulfate attack, with
The various mechanical properties change of research concrete after by sulfate attack.
To reach above-mentioned purpose, the technical solution adopted by the present invention is：One kind obtains buried concrete by sulfate attack
True mechanical property and the method for this structure afterwards, comprise the following steps：
(1) test group and control group are set, the sample in test group and control group is removed into two relative surfaces to be tested
Outer remaining surface is sealed, and ensures sample to be tested by one-dimensional erosion；
Test group sample is inserted into sulfate liquor, control group sample is inserted in clear water, corrodes age to different in test group
Phase weather after sample be layered along the direction of its depth of erosion, it is assumed that the sulfate ion in each layer is evenly distributed,
Defined parameters AmnAge, the n sulfate ion by the part that is not weathered inside sample to erosion surface are corroded for m-th
In the area perpendicular to erosion surface direction, wherein, m >=1,1≤n≤m, the part not weathered is perpendicular to erosion surface side
To area be designated as Am0, A=Am0+Am1+Am2+Am3+…Am(m-1)+Amm, the depth of erosion of each layer of measure, obtain in test group
The area A that weathers of m-th of erosion age samplem1、Am2、Am3、…Am(m-1)、AmmAnd the area A not weatheredm0；
(2) load-strain curve of sample in the different test groups for corroding age and control group is determined, obtains test group not
With the different P for corroding age of P- ε curves and control group for corroding age0- ε curves；
(3) by the Method of Seeking Derivative based on Lagrange interpolation polynomial, to different erosion ages in the step (2)
P- ε curves and P0Derivation obtains rigidity-strain curve corresponding to the erosion age sample to-ε curves respectively, and first corrodes
The sample of age obtains [the EA]-ε curves and [E corresponding to the erosion age0A10]-ε curves；
(4) by the Stiffness formula of first erosion age sample：
[E0A10]+[E1A11]=[EA]
[EA]-ε curves of first erosion age in the step (3) are subtracted into [E0A10]-ε curves obtain first sulfuric acid
Rigidity-strain curve [E under ion concentration1A11]-ε curves, try to achieve corresponding to A11The E of layer1- ε relation curves；
(5) numerical integration is passed through：σ (ε)=∫ E1(ε) d ε, obtain under first sulfate ion concentration of the first erosion age
Curves of stress-strain relationship σ1- ε curves.
Further, in addition to step (6)：[EA]-ε curves of second erosion age sample are obtained by the step (3)
[E0A20]-ε curves, the E obtained with reference to the step (4)1- ε curves and the Stiffness formula of second erosion age
[E0A20]+[E1A21]+[E2A22]=[EA], using such as described step (4) and the method for the step (5), obtain corresponding to A22
Layer i.e. the second curves of stress-strain relationship σ corroded under second sulfate ion concentration of age2- ε curves；Walked more than repeating
Suddenly, the strain-stress relation under the three to m-th sulfate ion concentration is obtained.
Further, the layered approach of test group sample is by determining sulfate ion concentration, entering in the step (1)
And the area that weathers of each layer of sample is obtained, it is comprised the following steps that：
(a) definition corresponds to A firstm1、Am2、Am3、…Am(m-1)、AmmSulfate ion total amount in layer is Um1、Um2、
Um3、…Um(m-1)、Umm, it meets following relation：
(b) by corresponding to A in the erosion age of measure first11The sulfate ion concentration of layer, tries to achieve the A11The sulfuric acid of layer
Radical ion total amount U11；
(c) due to U22With U11It is equal, A is corresponded to by measure22The concentration of sulfate ion tries to achieve A in layer22, measure the
Correspond to A in two erosion ages21The sulfate ion concentration of layer, tries to achieve the A21The sulfate ion total amount U of layer21；
(d) A is tried to achieve using the method such as the step (c)33And A32, and by corresponding in the erosion age of measure the 3rd
A31The sulfate ion concentration of layer, tries to achieve the A31The sulfate ion total amount U of layer31；
(e) above step is repeated, obtains the area A of each erosion age each layer11、A21、A22、…Am(m-1)、Amm。
Further, in the test group and the control group each erosion age at least provided with three parallel samples.
Further, the sample is cuboid, before being soaked to sample, to wherein four surface stones of sample
Wax seals.
Further, the sulfate liquor be mass percent be 1%-20% metabisulfite solution or magnesium sulfate it is molten
Liquid.
Further, the load-strain curve of test group is tried using microcomputer controlled electro-hydraulic servo rock in the step (2)
Testing relative two face that machine does not weather to sample and carrying out loading along its axial direction makes its compression.
After above technical scheme, the present invention has the following advantages that compared with prior art：The present invention is used to obtain ground
Lower concrete after by sulfate attack the method for mechanical property and constitutive relation it is easy to operate, calculate it is simple, to by sulfuric acid salt contamination
The buried concrete component of erosion, can accurately estimate its bearing capacity, and it is assessed and safeguarded, realize effectively defence,
Ensure it is safe for operation, and then improve concrete component reliability and extend its service life.
Brief description of the drawings
Accompanying drawing 1 is the different hierarchy schematic diagrames for corroding concrete component under ages, wherein, (a) figure is first and invaded
Lose age；(b) figure is second erosion age；(c) figure is m-th of erosion age；
Accompanying drawing 2 is the load-strain curve of concrete component, wherein, (a) figure is test group sample；(b) figure is same age
Control group sample；
Accompanying drawing 3 is rigidity-strain curve of concrete component；Wherein, (a) figure is test group sample；(b) figure is same age
Control group sample；
Accompanying drawing 4 be first corrode first sulfate ion concentration of age under concrete component rigidity-strain curve and
Modulus of elasticity-strain curve；Wherein, (a) figure is rigidity-strain curve；(b) figure is modulus of elasticity-strain curve；
Accompanying drawing 5 is the first strain-stress relation song for corroding concrete component under first sulfate ion concentration of age
Line；
Accompanying drawing 6 is the load-strain curve of concrete component in embodiment 1；Wherein, (a) figure is test group sample；(b)
Figure is the control group sample of same age；
Accompanying drawing 7 is rigidity-strain curve of concrete component in embodiment 1；Wherein, (a) figure is test group sample；(b)
Figure is the control group sample of same age；
Accompanying drawing 8 be embodiment 1 in first corrode first sulfate ion concentration of age under concrete component rigidity-should
Varied curve；
Accompanying drawing 9 be embodiment 1 in first corrode first sulfate ion concentration of age under concrete component stress-should
Become relation curve；
Accompanying drawing 10 corrodes σ under first sulfate ion concentration of age for the first of the present invention1- ε calculation flow charts；
Accompanying drawing 11 is σ under each sulfate ion concentration in the present invention2-n- ε calculation flow charts.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the invention will be further described.
It is a kind of to obtain buried concrete true mechanical property and method of this structure after by sulfate attack such as Fig. 1 to Figure 11,
Comprise the following steps：
(1) test group and control group are set, the sample in test group and control group is removed into two relative surfaces to be tested
Outer remaining surface is sealed, and ensures sample to be tested by one-dimensional erosion.
Test group sample is inserted into sulfate liquor, control group sample is inserted in clear water, and sulfate liquor is quality percentage
Number is 1%-20% metabisulfite solution or Adlerika.
Because sulfate ion from outward appearance to inner essence has obvious concentration gradient during sulfate attack, so pressing sulphur
The difference of acid ion concentration, the sample in test group is layered, and assumes that the sulfate ion in each layer is all equal
Even distribution, then the strain-stress relation in each layer, you can be considered as the concrete component to weather under different erosion degrees
Constitutive relation.
As shown in figure 1, defined parameters AmnAge is corroded for m-th, by the part that is not weathered inside sample to erosion table
The n sulfate ion in face in the area perpendicular to erosion surface direction, wherein, m >=1,1≤n≤m, the portion not weathered
Divide and be designated as A in the area perpendicular to erosion surface directionm0, A=Am0+Am1+Am2+Am3+…Am(m-1)+Amm, measure each layer invades
Depth is lost, obtains the area A that weathers of m-th of erosion age sample in test groupm1、Am2、Am3、…Am(m-1)、AmmAnd not by
The area A of erosionm0.Each erosion age is at least provided with three parallel samples in test group and control group.
M corroded in age, and each length for corroding age can be different, and the erosion age length for being preferably placed at rear portion is big
In the erosion age length positioned at front portion.
The layered approach of test group sample is by determining sulfate ion concentration, and then obtains weathering for each layer of sample
Area, it is comprised the following steps that：
(a) definition corresponds to A firstm1、Am2、Am3、…Am(m-1)、AmmSulfate ion total amount in layer is Um1、Um2、
Um3、…Um(m-1)、Umm, it meets following relation：
(b) by corresponding to A in the erosion age of measure first11The sulfate ion concentration of layer, tries to achieve the A11The sulfuric acid of layer
Radical ion total amount U11；
(c) due to U22With U11It is equal, A is corresponded to by measure22The concentration of sulfate ion tries to achieve A in layer22, measure the
Correspond to A in two erosion ages21The sulfate ion concentration of layer, tries to achieve the A21The sulfate ion total amount U of layer21；
(d) A is tried to achieve using the method such as the step (c)33And A32, and by corresponding in the erosion age of measure the 3rd
A31The sulfate ion concentration of layer, tries to achieve the A31The sulfate ion total amount U of layer31；
(e) above step is repeated, obtains the area A of each erosion age each layer11、A21、A22、…Am(m-1)、Amm。
(2) relative two face that microcomputer controlled electro-hydraulic servo rock test rig does not weather to sample is used along its axial direction
Carrying out loading makes its compression, determines the load-strain curve of sample in the different test groups for corroding age and control group, is surveyed
Different P- ε curves (referring to accompanying drawing 2 (a)) Ps that corrodes age different with control group for corroding age of examination group0- ε curves are (referring to attached
Fig. 2 (b)).
(3) by the Method of Seeking Derivative based on Lagrange interpolation polynomial, to the different P- ε for corroding age in step (2)
Curve and P0Derivation obtains rigidity-strain curve corresponding to the erosion age sample to-ε curves respectively, and first corrodes age
The sample of phase obtains [the EA]-ε curves (referring to accompanying drawing 3 (a)) and [E corresponding to the erosion age0A10]-ε curves are (referring to accompanying drawing
3(b))。
(4) by the Stiffness formula of first erosion age sample：
[E0A10]+[E1A11]=[EA]
[EA]-ε curves of first erosion age in step (3) are subtracted into [E0A10]-ε curves obtain first sulfate radical from
Rigidity-strain curve [E under sub- concentration1A11]-ε curves (referring to accompanying drawing 4 (a)), try to achieve corresponding to A11The E of layer1- ε relations are bent
Line (referring to accompanying drawing 4 (b)).
(5) numerical integration is passed through：σ (ε)=∫ E1(ε) d ε, obtain under first sulfate ion concentration of the first erosion age
Curves of stress-strain relationship σ1- ε curves (referring to accompanying drawing 5).
(6) [the EA]-ε curves and [E of the second erosion age sample are obtained by the step (3)0A20]-ε curves, with reference to institute
State the E that step (4) obtains1- ε curves and the Stiffness formula [E of second erosion age0A20]+[E1A21]+[E2A22]=
[EA], using such as described step (4) and the method for the step (5), obtain corresponding to A22Layer i.e. second corrodes age second
Curves of stress-strain relationship σ under sulfate ion concentration2- ε curves；Above step is repeated, obtains the three to m-th sulfuric acid
Strain-stress relation under ion concentration.
Embodiment 1：
Using 100 × 100 × 300mm concrete component as sample to be tested, retain two relative 100 × 300mm
Surface is sealed as erosion surface, remaining four surface with paraffin.
Test group and control group are set, and set the time of the first erosion age as 10 days.The sample of test group is placed in
Mass fraction is in 10% metabisulfite solution, and control group sample is placed in clear water.
It is 2.5mm to corrode depth of erosion of its erosion surface of test group sample of age erosion inside by first,
That is the area A that weathers of sample11=500mm2, do not weather area A10=9500mm2, measure corresponding to A11Sulfate radical in layer
Ion concentration is 1.6877%.
Using microcomputer controlled electro-hydraulic servo rock test rig to the test group by the first erosion age and control group pilot scale
Two 100 × 100mm of sample face loads respectively makes its compression, measures the P of the test group sample of the first erosion age1- ε curves
(referring to accompanying drawing 6 (a)) and the P with the sample that do not weathered in age control group0- ε curves are referring to accompanying drawing 6 (b).
By the Method of Seeking Derivative based on Lagrange interpolation polynomial, to above-mentioned P1- ε curves and P0The derivation of-ε curves is distinguished
Rigidity-strain curve [EA]-ε curves (referring to accompanying drawing 7 (a)) of sample and [E0A10]-ε curves (referring to accompanying drawing 7 (b)).
By the Stiffness formula of concrete：[E can be obtained1A11]-ε curves are (referring to attached
Fig. 8).
Pass through numerical integration：σ (ε)=∫ E1(ε) d ε, can obtain the strain-stress relation under first sulfate ion concentration
Curve (referring to accompanying drawing 9).
By above step, the strain-stress relation for the concrete that sulfate ion concentration is 1.6877% can be tried to achieve, is repeated
Above step, you can obtain the strain-stress relation under multiple sulfate ion concentrations.
The present invention is used to obtain the buried concrete method of mechanical property and constitutive relation operation letter after by sulfate attack
Just, calculate simply, the bearing capacity of the concrete component after weathering can accurately be estimated, and it is assessed and safeguarded,
Ensure safe for operation, and then extend its service life.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (7)
1. a kind of acquisition buried concrete true mechanical property and method of this structure after by sulfate attack, it is characterised in that bag
Include following steps：
(1) test group and control group are set, by the sample in test group and control group in addition to two relative surfaces to be tested
Remaining surface is sealed, and ensures sample to be tested by one-dimensional erosion；
Test group sample is inserted into sulfate liquor, control group sample is inserted in clear water, in test group it is different corrode age by
Sample after erosion is layered along the direction of its depth of erosion, it is assumed that the sulfate ion in each layer is evenly distributed, definition
Parameter AmnAge is corroded for m-th, is being hung down by part to the n sulfate ion of erosion surface not weathered inside sample
Directly in the area in erosion surface direction, wherein, m >=1,1≤n≤m, the part not weathered is perpendicular to erosion surface direction
Area is designated as Am0, A=Am0+Am1+Am2+Am3+…Am(m-1)+Amm, the depth of erosion of each layer of measure, obtain in test group m-th
Corrode the area A that weathers of age samplem1、Am2、Am3、…Am(m-1)、AmmAnd the area A not weatheredm0；
(2) load-strain curve of sample in the different test groups for corroding age and control group is determined, test group difference is obtained and invades
Lose the P of P- ε curves different erosion ages with control group of age0- ε curves；
(3) by the Method of Seeking Derivative based on Lagrange interpolation polynomial, to the different P- ε for corroding age in the step (2)
Curve and P0Derivation obtains rigidity-strain curve corresponding to the erosion age sample to-ε curves respectively, and first corrodes age
The sample of phase obtains [the EA]-ε curves and [E corresponding to the erosion age0A10]-ε curves；
(4) by the Stiffness formula of first erosion age sample：
[E0A10]+[E1A11]=[EA]
[EA]-ε curves of first erosion age in the step (3) are subtracted into [E0A10]-ε curves obtain first sulfate radical from
Rigidity-strain curve [E under sub- concentration1A11]-ε curves, try to achieve corresponding to A11The E of layer1- ε relation curves；
(5) numerical integration is passed through：σ (ε)=∫ E1(ε) d ε, obtain answering under first sulfate ion concentration of the first erosion age
Power-strain curve σ1- ε curves.
2. a kind of acquisition buried concrete according to claim 1 true mechanical property and this structure after by sulfate attack
Method, it is characterised in that also including step (6)：By the step (3) obtain the second erosion age sample [EA]-ε curves and
[E0A20]-ε curves, the E obtained with reference to the step (4)1- ε curves and the Stiffness formula of second erosion age
[E0A20]+[E1A21]+[E2A22]=[EA], using such as described step (4) and the method for the step (5), obtain corresponding to A22
Layer i.e. the second curves of stress-strain relationship σ corroded under second sulfate ion concentration of age2- ε curves；Walked more than repeating
Suddenly, the strain-stress relation under the three to m-th sulfate ion concentration is obtained.
3. a kind of acquisition buried concrete according to claim 1 true mechanical property and this structure after by sulfate attack
Method, it is characterised in that the layered approach of test group sample is by determining sulfate ion concentration, entering in the step (1)
And the area that weathers of each layer of sample is obtained, it is comprised the following steps that：
(a) definition corresponds to Am1、Am2、Am3、…Am(m-1)、AmmSulfate ion total amount in layer is Um1、Um2、Um3、…Um(m-1)、
Umm, it meets following relation：
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(b) by corresponding to A in the erosion age of measure first11The sulfate ion concentration of layer, tries to achieve the A11Layer sulfate radical from
Sub- total amount U11；
(c) due to U22With U11It is equal, A is corresponded to by measure22The concentration of sulfate ion tries to achieve A in layer22, determine second and invade
Correspond to A in erosion age21The sulfate ion concentration of layer, tries to achieve the A21The sulfate ion total amount U of layer21；
(d) A is tried to achieve using the method such as the step (c)33And A32, and by corresponding to A in the erosion age of measure the 3rd31Layer
Sulfate ion concentration, try to achieve the A31The sulfate ion total amount U of layer31；
(e) above step is repeated, obtains the area A of each erosion age each layer11、A21、A22、…Am(m-1)、Amm。
4. a kind of acquisition buried concrete according to claim 1 true mechanical property and this structure after by sulfate attack
Method, it is characterised in that：Each erosion age is at least provided with three parallel samples in the test group and the control group.
5. a kind of acquisition buried concrete according to claim 1 true mechanical property and this structure after by sulfate attack
Method, it is characterised in that：The sample is cuboid, before being soaked to sample, to wherein four surface stones of sample
Wax seals.
6. a kind of acquisition buried concrete according to claim 1 true mechanical property and this structure after by sulfate attack
Method, it is characterised in that：The sulfate liquor is the metabisulfite solution or Adlerika that mass percent is 1%-20%.
7. a kind of acquisition buried concrete according to claim 1 true mechanical property and this structure after by sulfate attack
Method, it is characterised in that：The load-strain curve of test group is tried using microcomputer controlled electro-hydraulic servo rock in the step (2)
Testing relative two face that machine does not weather to sample and carrying out loading along its axial direction makes its compression.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036390A (en) * | 2004-09-15 | 2007-09-12 | 法国电信公司 | Method for estimating motion using deformable meshes |
| CN101903805A (en) * | 2007-12-21 | 2010-12-01 | 埃克森美孚上游研究公司 | Modeling in sedimentary basins |
| CN104792945A (en) * | 2015-05-07 | 2015-07-22 | 武汉大学 | Rockfill scouring simulation experiment device and experimental data acquisition method |
| CN106226225A (en) * | 2016-07-01 | 2016-12-14 | 武汉理工大学 | A kind of evaluate the concrete method by acid-rain corrosion degree |
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|---|---|---|---|---|
| CN101036390A (en) * | 2004-09-15 | 2007-09-12 | 法国电信公司 | Method for estimating motion using deformable meshes |
| CN101903805A (en) * | 2007-12-21 | 2010-12-01 | 埃克森美孚上游研究公司 | Modeling in sedimentary basins |
| CN104792945A (en) * | 2015-05-07 | 2015-07-22 | 武汉大学 | Rockfill scouring simulation experiment device and experimental data acquisition method |
| CN106226225A (en) * | 2016-07-01 | 2016-12-14 | 武汉理工大学 | A kind of evaluate the concrete method by acid-rain corrosion degree |
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| 黄子睿: "硫酸盐侵蚀下混凝土应力效应数值分析", 《中国优秀硕士学位论文 工程科技I辑》 * |
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