CN106524979A - Laboratory determination method of sulfate erosion depth in concrete - Google Patents
Laboratory determination method of sulfate erosion depth in concrete Download PDFInfo
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- CN106524979A CN106524979A CN201610931510.XA CN201610931510A CN106524979A CN 106524979 A CN106524979 A CN 106524979A CN 201610931510 A CN201610931510 A CN 201610931510A CN 106524979 A CN106524979 A CN 106524979A
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- concrete
- test block
- concrete column
- column test
- sulfate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/18—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring depth
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a laboratory determination method of sulfate erosion depth in concrete, and belongs to the concrete testing field. The laboratory determination method of sulfate erosion depth in concrete includes the following steps: manufacturing a concrete column test block: pre-pasting a foil gauge on the surface of a plain round steel bar, and pouring concrete by taking the plain round steel bar as the center to manufacture a concrete column test block, wherein the length of the concrete column test block is equal to the length of the plain round steel bar; immersing the concrete column test block in a barrel with sulfate liquor; using a pressure testing machine to perform an axle pressure test on the test block: disposing the barrel with the concrete column test block on the pressure testing machine, performing an axle pressure test with the specified constant pressure on the upper and lower surfaces of the concrete column test block, wherein the test time is not less than half a year, and the steel bar strain epsilons is obtained through the foil gauge on the plain round steel bar, and then through force equilibrium, by means of three formulas, the depth DeltaL that the concrete is eroded by sulfate can be derived; and changing the specified constant pressure, calculating the depth DeltaL that the concrete is eroded by sulfate in different pressure and in different time.
Description
Technical field
The invention belongs to concrete determines field, more particularly to a kind of concrete is determined by sulfate attack depth experiments room
Method.
Background technology
Concrete has the extraneous ability for corroding of stronger opposing, has a kind of durability similar to lithotome, therefore
Its strength factor is often only considered when using concrete.But under actual use environment, concrete is subject to air, soil
And in the various extraneous factors such as water harmful substance erosion, or the physics and chemical action of concrete harmful components itself,
The endurance quality of concrete can occur to degenerate.China has 1/3rd territory to be under Acid Rain, in actual environment
In, among sulfate is widely distributed in soil and water environment, therefore sulfate attack is to affect concrete durability
One important performance, they are penetrated into inside concrete by various transporting mechanisms and are reacted with hydrolysis product of cement, are led
Concrete is caused to expand, crack and flake off destruction.Sulfate can be divided into three kinds of deterioration forms for the erosion of concrete, respectively
For acid deterioration, degrade deterioration and expansion deterioration.Wherein topmost failure mode is the concentration according to sulfate, the stone of generation
Cream and entringite cause volume to expand and destroy.
Have not yet to see laboratory determination method of the simple and practical concrete by sulfate attack depth.
The content of the invention
The technical problem to be solved is to provide a kind of concrete by sulfate attack depth experiments room measure side
Method, by the axial compression test of specified constant pressure, analyzes the foil gauge pasted on plain bar in advance and measures under different time
Plain bar is strained, then by stress balance, you can derive that concrete receives sulfate attack depth。
To solve above-mentioned technical problem, the technical solution used in the present invention is：A kind of concrete receives sulfate attack depth
Degree laboratory determination method, comprises the following steps：
First, make concrete column test block：Foil gauge is pasted in advance on a plain bar surface, is poured centered on plain bar
Build concrete and make concrete column test block, the length of concrete column test block and the equal length of plain bar；
2nd, concrete column test block is immersed in the bucket for filling sulfate liquor；
3rd, axial compression test is carried out to test block with pressure testing machine：The bucket that will be equipped with concrete column test block is placed in pressure testing machine
On, the axial compression test of the constant pressure specified to the upper and lower surface of concrete column test block, time are no less than half a year, pass through
The reinforcing bar strain that foil gauge on plain bar is measured, by stress balance, by formula（1）, formula（2）Public affairs can be derived
Formula（3）, obtain the depth that concrete is subjected to sulfate attack,
（1）
（2）
（3）
WhereinThe elastic modelling quantity of reinforcing bar；
The strain of plain bar obtained by foil gauge；
The area of section of plain bar；
The elastic modelling quantity of concrete column test block；
The strain of concrete column test block, in this test=；
The area of section of concrete column test block,；
The upper lower section length of side of concrete column test block,；
Depth of the concrete column test block by sulfate attack（mm）；
The constant pressure of N axial compression tests；
4th, the constant pressure specified, repeat the above steps, you can calculate under different pressures different time, concrete is received are changed
The depth of sulfate attack。
Further technical scheme, in the upper and lower surface uniform application epoxy resin of concrete column test block.
Further technical scheme, concrete column test block are four-prism.
Further technical scheme, the size of four-prism is 150 × 150 × 300mm.
Further technical scheme, sulfate liquor is 0.8 ~2.0'sSolution.
Further technical scheme, the constant pressure specified of axial compression test is 0.3f ck ~0.8Between choose.
Further technical scheme, a diameter of 20 mm ~ 28 mm of the plain bar.
Further technical scheme, during test, on the bearing plate up and down of the pressure testing machine, correspondence is installed and is pushed
Plate, the size of top board are pushed not less than 0.707 times of the size not larger than bung diameter of concrete column test block upper surface
Diameter of the size of plate not less than bucket bottom.
Using the beneficial effect produced by above-mentioned technical proposal it is：
1st, the present invention is under specified constant pressure to carry out axial compression test to concrete column test block, by pre- on plain bar
The foil gauge first pasted measures plain bar strain, then by stress balance, can derive that concrete receives sulfate attack
Depth；
2nd, the present invention can be derived that the numerical value of depth of erosion, can be carried out quantitative test by sulfate attack depth to concrete；
3rd, the present invention is carried out in laboratory, and required laboratory apparatus is few, easy to operate.
Description of the drawings
Fig. 1 is the schematic diagram of concrete column test block of the present invention；
Fig. 2 is the schematic diagram of the axial compression test of the constant pressure that the present invention is specified；
Fig. 3 is the schematic diagram of the concrete column test block by sulfate attack；
In figure：1st, plain bar；2nd, concrete column test block；3rd, upper bearing plate；4th, lower bearing plate；5th, top board；6th, lower platen；
7th, the concrete being corroded；8th, bucket.
Specific embodiment
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
A kind of concrete receives sulfate attack depth experiments room assay method, comprises the following steps：
First, make concrete column test block 2 as shown in Figure 1：Foil gauge is pasted in advance on 1 surface of plain bar, with light
Centered on round bar 1, casting concrete makes concrete column test block 2, length and the plain bar 1 of concrete column test block 2
Equal length；
2nd, concrete column test block 2 is immersed in the bucket 8 for filling sulfate liquor；
3rd, with reference to Fig. 2, axial compression test is carried out to test block with pressure testing machine：The bucket that will be equipped with concrete column test block 2 is placed in pressure
On force tester, the axial compression test of the constant pressure specified to the upper and lower surface of concrete column test block 2, time are no less than
Half a year, strained by the reinforcing bar that the foil gauge on plain bar 1 is measured, by stress balance, by formula（1）, formula（2）Can
Derive formula（3）, obtain the depth that concrete is subjected to sulfate attack, as shown in figure 3,
（1）
（2）
（3）
WhereinThe elastic modelling quantity of reinforcing bar；
The strain of plain bar obtained by foil gauge；
The area of section of plain bar；
The elastic modelling quantity of concrete column test block；
The strain of concrete column test block, in this test=；
The area of section of concrete column test block,；
The upper lower section length of side of concrete column test block,；
Depth of the concrete column test block by sulfate attack（mm）；
The constant pressure of N axial compression tests；
4th, the constant pressure specified, repeat the above steps, you can calculate under different pressures different time, concrete is received are changed
The depth of sulfate attack。
In order to preventSolution corrodes test block upper and lower surface, uniformly applies in the upper and lower surface of concrete column test block
Smear epoxy resin.
Concrete column test block 2 is four-prism or can make cylinder.Wherein, the size of four-prism is
150×150×300mm。
Sulfate liquor is 0.8 ~2.0'sSolution.
The constant pressure specified of axial compression test is 0.3f ck ~0.8Between choose, by change apply axial direction pressure
Power, can obtain different pressures under different time, and depth of the concrete by sulfate attack is mixed in Practical Project so as to judge
Solidifying soil receives the depth of sulfate attack under different pressures different time, in Practical Project, concrete receives sulphate corrosion
Depth can be prevented to concrete component in time early with meaning is judged, safeguard in time, it is to avoid cause serious destruction.
Wherein, a diameter of 20 mm ~ 28 mm of the plain bar.
As shown in Fig. 2 during test, under on the upper bearing plate 3, lower bearing plate 4 in the pressure testing machine, correspondence is installed
Pressing plate, the size of top board 5 are not less than 0.707 times of the size not larger than bung diameter of 2 upper surface of concrete column test block,
So that top board is as square as an example, the length of side of top board 5 is at least equal with the length of side of concrete column test block 2, that is, upper pressure
Plate will just oversite concrete cylinder test block 2 upper surface, or the surface of top board is greater than concrete column examination
The upper surface of block 2, it is ensured that concrete column test block uniform-compression, but, as concrete column test block is to be immersed in sulfate
In, the size of top board 6 is less than bung, can just be pressed onto above concrete column test block；In addition, the size of lower platen 6
Not less than the diameter at bucket bottom, that is, bucket bottom all can be seated on lower platen, so, it is ensured that the axial direction pressure of pressure testing machine
Power uniformly can be pressed in concrete column test block, it is ensured that the accuracy of result of the test.
The explanation of above example is only intended to help and understands the present invention, it is noted that for the technology of the art
For personnel, under the premise without departing from the principles of the invention, some improvement can be carried out to the present invention also, these improvement also fall into this
In invention scope of the claims.
Claims (8)
1. a kind of concrete receives sulfate attack depth experiments room assay method, it is characterised in that comprise the following steps：
First, make concrete column test block（2）：In a plain bar（1）Foil gauge is pasted on surface in advance, with plain bar
（1）Centered on casting concrete make concrete column test block（2）, concrete column test block（2）Length and plain bar（1）
Equal length；
2nd, by concrete column test block（2）It is immersed in the bucket for filling sulfate liquor（8）In；
3rd, axial compression test is carried out to test block with pressure testing machine：Will be equipped with concrete column test block（2）Bucket（8）It is placed in pressure
On testing machine, to concrete column test block（2）The axial compression test of constant pressure specified of upper and lower surface, the time is no less than
Half a year, by plain bar（1）On foil gauge measure under different time reinforcing bar strain, according to stress balance, by public affairs
Formula（1）, formula（2）Formula can be derived（3）, obtain depth of the concrete by sulfate attack,
（1）
（2）
（3）
WhereinThe elastic modelling quantity of reinforcing bar；
The strain of plain bar obtained by foil gauge；
The area of section of plain bar；
The elastic modelling quantity of concrete column test block；
The strain of concrete column test block, in this test=；
The area of section of concrete column test block,；
The upper lower section length of side of concrete column test block,；
Depth of the concrete column test block by sulfate attack（mm）；
The constant pressure of N axial compression tests；
4th, the constant pressure specified, repeat the above steps, you can calculate under different pressures different time, concrete is received are changed
The depth of sulfate attack。
2. concrete according to claim 1 receives sulfate attack depth experiments room assay method, it is characterised in that mixed
Solidifying earth pillar body test block（2）Upper and lower surface uniform application epoxy resin.
3. concrete according to claim 1 receives sulfate attack depth experiments room assay method, it is characterised in that coagulation
Earth pillar body test block（2）For four-prism.
4. concrete according to claim 3 receives sulfate attack depth experiments room assay method, it is characterised in that positive four
The size of prism is 150 × 150 × 300mm.
5. concrete according to claim 1 receives sulfate attack depth experiments room assay method, it is characterised in that sulfuric acid
Salting liquid is 0.8 ~2.0'sSolution.
6. concrete according to claim 1 receives sulfate attack depth experiments room assay method, it is characterised in that axle pressure
The constant pressure specified of test is 0.3f ck ~0.8Between choose.
7. concrete according to claim 1 receives sulfate attack depth experiments room assay method, it is characterised in that described
A diameter of 20 mm ~ 28 mm of plain bar.
8. concrete according to claim 1 receives sulfate attack depth experiments room assay method, it is characterised in that test
When, in the upper bearing plate of the pressure testing machine（3）With lower bearing plate（4）Upper correspondence installs lower platen, top board（5）Chi
It is very little not less than concrete column test block（2）The size of upper surface is not larger than 0.707 times of bung diameter, lower platen（6）Chi
The very little diameter not less than bucket bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610931510.XA CN106524979B (en) | 2016-10-31 | 2016-10-31 | Concrete is by sulfate attack depth experiments room measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610931510.XA CN106524979B (en) | 2016-10-31 | 2016-10-31 | Concrete is by sulfate attack depth experiments room measuring method |
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| CN106524979A true CN106524979A (en) | 2017-03-22 |
| CN106524979B CN106524979B (en) | 2019-05-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112887A (en) * | 2021-12-13 | 2022-03-01 | 长江师范学院 | Test method for accelerating sulfate erosion destruction speed |
| CN114112885A (en) * | 2021-12-09 | 2022-03-01 | 长江师范学院 | Sulfate erosion depth detection method |
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| US6627065B1 (en) * | 2000-11-20 | 2003-09-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration | Liquid galvanic coatings for protection of imbedded metals |
| CN102393329A (en) * | 2011-11-16 | 2012-03-28 | 浙江建设职业技术学院 | Test device for time varying mechanical properties of column under load-environment coupling effect |
| CN102721637A (en) * | 2012-06-29 | 2012-10-10 | 浙江大学 | Multi-functional test system and method for concrete durability under action of continuous pressure |
| EP2896667A1 (en) * | 2014-01-21 | 2015-07-22 | Grupo Navec Servicios Industriales, SL | Repairing and sealing method for tank with leak problems due corrosion, and repair sealer coating |
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| US6627065B1 (en) * | 2000-11-20 | 2003-09-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration | Liquid galvanic coatings for protection of imbedded metals |
| CN102393329A (en) * | 2011-11-16 | 2012-03-28 | 浙江建设职业技术学院 | Test device for time varying mechanical properties of column under load-environment coupling effect |
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| EP2896667A1 (en) * | 2014-01-21 | 2015-07-22 | Grupo Navec Servicios Industriales, SL | Repairing and sealing method for tank with leak problems due corrosion, and repair sealer coating |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114112885A (en) * | 2021-12-09 | 2022-03-01 | 长江师范学院 | Sulfate erosion depth detection method |
| CN114112885B (en) * | 2021-12-09 | 2024-03-01 | 长江师范学院 | Sulfate erosion depth detection method |
| CN114112887A (en) * | 2021-12-13 | 2022-03-01 | 长江师范学院 | Test method for accelerating sulfate erosion destruction speed |
| CN114112887B (en) * | 2021-12-13 | 2024-02-06 | 长江师范学院 | Test method for accelerating sulfate erosion damage speed |
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| CN106524979B (en) | 2019-05-07 |
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Effective date of registration: 20230413 Address after: Leting Economic Development Zone, Tangshan City, Hebei Province Patentee after: Hebei Sidong Environmental Protection Technology Co.,Ltd. Address before: 050043 No. 17, North Second Ring Road, Hebei, Shijiazhuang Patentee before: SHIJIAZHUANG TIEDAO University |
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