CN104614306B - Method for testing corrosion effect of gyprock on concrete under action of multiple factors - Google Patents
Method for testing corrosion effect of gyprock on concrete under action of multiple factors Download PDFInfo
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- CN104614306B CN104614306B CN201510059604.8A CN201510059604A CN104614306B CN 104614306 B CN104614306 B CN 104614306B CN 201510059604 A CN201510059604 A CN 201510059604A CN 104614306 B CN104614306 B CN 104614306B
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Abstract
The invention discloses a method for testing the corrosion effect of gyprock on concrete under action of multiple factors. The method comprises the following steps: firstly determining influence factors and establishing an orthogonal test table; then preparing a standard cylindrical sample and putting the standard cylindrical sample into a cylindrical cavity; preparing calcium sulfate solutions with different concentrations, firstly injecting the calcium sulfate solutions into an annular cavity and putting a test device into a constant-temperature water bath box; introducing pressure-containing nitrogen into the annular cavity for pressing, taking out the standard cylindrical sample after reaching the test time, and measuring compressive strength; and finally observing the compressive strength, the surface crack and the mass change of the standard cylindrical sample after being subjected to the corrosion test. The test method can be used for researching the corrosion effect under the combined action of multiple factors including concrete strength, concrete impermeability grade, C3A content, water pressure, time and sulfate concentration; the test method is simple and comprehensive in consideration factors, and has significance for guiding on-site construction.
Description
Technical field
The present invention relates to a kind of selenolite is tested to the corrosive effect of concrete, selenolite under more particularly, to multifactor effect
Corrosive effect test to concrete, can be optimized to antiseptic concrete measure by this test.
Background technology
In recent years, with the progressively expansion of China's Transportation Infrastructure Construction scale, highway construction fast development, in tunnel
The ratio that journey accounts for route total kilometrage is also increasing.Expressway construction develops rapidly in recent years for Chongqing City, to the end of the year 2009
, to break through 1500 kilometers, due to being located in Southwest Mountainous Areas, Chongqing freeway tunnel ratio is bigger for highway mileage open to traffic, and
A lot of Tunnel Passing Gypsum Fibrosum rock stratum.
Selenolite has severe corrosive to tunnel concrete.In selenolite there is thing in the calcium sulphate soln of dissolution and concrete
Physicochemical acts on, and causes concrete strength reduction, crack to increase, has a strong impact on the long-time stability in tunnel.
At present, there are the following problems to tunnel corrosion research for selenolite：(1) research direction stresses corrosion mechanism, test
Stress to study the interaction of sulfate ion and concrete ingredients.(2) experimental study considers that single factors act on such as：Temperature,
Ion concentration, concrete strength, do not account for corrosive effect under many factors collective effect.(3) it is used for evaluating corrosive effect
Index is single, and mostly qualitative description.(4) model test, relatively simply it is impossible to incorporation engineering is actual, does not account for hydraulic pressure to corrosion
The impact of effect.
Content of the invention
For deficiency above-mentioned present in prior art, the invention provides a kind of lower selenolite of multifactor effect is to coagulation
Native corrosive effect test method.The method can well incorporation engineering actual, draw selenolite under many factors collective effect
Corrosive effect, and quantitative assessment can be carried out to corrosive effect.Quantitative result can be used in instructing and optimised coagulation soil proportioning, excellent
Concrete formulation after change can meet engine request and economical rationality.
In order to solve above-mentioned technical problem, present invention employs following technical scheme：
Under multifactor effect, selenolite, to concrete erosion effect test method, tests dress using a kind of in the method
Put, this assay device includes base, sealing ring, hold-down ring and nut cap；The middle part of described base is in vertical direction setting one
Hold uncovered circular cylindrical cavity, bottom setting one and the discharge outlet communicating in cylindrical cavity body of described base；This test method
Comprise the steps：
1) determine influence factor：Concrete strength, concrete impervious grade, C3A content, hydraulic pressure, temperature and time；
2) according to engineering specifications, hydrogeologic condition and test objective, design the gradient of each factor, set up orthogonal test
Table；
3) according to test table, configuration varying strength, different seepage-resistant grade, different C3The concrete of A content, is poured with mould
Become two standard column type test specimens of the high 100mm of diameter 50mm；One standard column type test specimen is used for doing corrosion testing, another
Standard column type test specimen is used for contrasting；
4) the standard column type test specimen being used for doing corrosion testing is placed in circular cylindrical cavity, sealing ring is enclosed within this standard
The top of column type test specimen, and hold-down ring is enclosed within the top of this standard column type test specimen and screws upper in cylindrical cavity body
Portion, the bottom compression sealing ring of hold-down ring；Described nut cap screws at the top of base and seals cooperation, in base with base
Form an annular housing between top in top and nut cap；
5) it is the result that sulfate radical and concrete occur physics chemical action to the corrosion mechanism of concrete based on selenolite,
Configure the calcium sulphate soln of variable concentrations using pure calcium sulfate particle；
6) according to orthogonal design table, first inject the calcium sulphate soln preparing into annular housing；
7) assay device adding standard column type test specimen and calcium sulphate soln is placed in constant water bath box, according to orthogonal
Experiment table setting temperature；
8) it is passed through the nitrogen containing pressure into annular housing by gas cylinder calcium sulphate soln is pressurizeed, pressurizeed size is according to orthogonal
Test table；
9) after reaching test period, take out the standard column type test specimen after corrosion, after drying, weigh quality, measurement quality becomes
Change, face crack changes；
10) the standard column type test specimen after corrosion is done crush test using three-axis tester, draw its comprcssive strength.
As a preferred embodiment of the present invention, in step 7) in, constant water bath box is along the excircle setting of base.
Compared with prior art, under the multifactor effect of the present invention, selenolite has to concrete erosion effect test method
Following advantage：
1st, this test method can be studied many factors and include：Concrete strength, concrete impervious grade, C3A content, water
Corrosive effect under pressure, time and sulfate concentration collective effect.
2nd, the simple Consideration of test method comprehensively, has directive significance to site operation.
Brief description
Fig. 1 is the cross section view of assay device；
Fig. 2 is the cross section view of nut cap.
In accompanying drawing：1 base；2 sealing rings；3 hold-down rings；4 nut caps；5 discharge outlet；6 standard column types
Test specimen；7 annular housings；8 air inlets.
Specific embodiment
With reference to the accompanying drawings and detailed description the present invention is described in further detail.
Under multifactor effect, selenolite, to concrete erosion effect test method, tests dress using a kind of in the method
Put, as shown in figure 1, this assay device includes base 1, sealing ring 2, hold-down ring 3 and nut cap 4.The middle part of base 1 is in vertically side
To arranging the uncovered circular cylindrical cavity in a upper end, the bottom of base 1 arranges one and the discharge outlet 5 communicating in cylindrical cavity body.Should
Test method comprises the steps：
1) determine influence factor：Concrete strength, concrete impervious grade, C3A content, hydraulic pressure, hydraulic pressure, temperature, time
WithSulfate concentration.
2) according to engineering specifications, hydrogeologic condition and test objective, design the gradient of each factor, set up orthogonal test
Table.
1., orthogonal test scheme
First three items are three indexs of concrete, configure satisfactory concrete by following technology path and (please join
Examine)：
1. strength grade of concrete：According to JGJ 55-2011《Design of common concrete proportioning code》Design C15,
Five strength grades of C25, C35, C45, C55.
2. concrete impervious grade：According to the operating specification of water-tight concrete, to be controlled using the interior method mixing extender
The seepage-resistant grade of concrete.
3.C3The control of A content：The C of Portland cement (P.O)3A content is 8%～12%, high sulfate resisting
(P.HSR) C3A content≤3%, mixes C in Binder Materials used by Control release again by two kinds of cement3The content of A, and protect
Other properties of two kinds of cement of card no interfere the (adaptability as strength grade, setting time, stability and additive
Deng).
2., according to as above testing program (as upper table), design 7 factor 5 horizontal quadrature test table, following (7 of orthogonal table
The factor of impact corrosion, each factor arranges 5 levels)：
3) according to test table, configuration varying strength, different seepage-resistant grade, different C3The concrete of A content, is poured with mould
Become two standard column type test specimens of the high 100mm of diameter 50mm；One standard column type test specimen is used for doing corrosion testing, another
Standard column type test specimen is used for contrasting.
4) the standard column type test specimen 6 being used for doing corrosion testing is placed in circular cylindrical cavity, sealing ring 2 is enclosed within this mark
The top of director circle column type test specimen 6, and hold-down ring 3 is enclosed within the top of this standard column type test specimen 6 and screws in circular cylindrical cavity
Interior top, the bottom compression sealing ring 2 of hold-down ring 3；Nut cap 4 screws at the top of base 1 and seals cooperation with base 1,
The structure of nut cap is as shown in Fig. 2 the middle top of nut cap 4 arranges an air inlet 8, in the top of base 1 with nut cap 4
Top between form an annular housing 7.
5) it is the result that sulfate radical and concrete occur physics chemical action to the corrosion mechanism of concrete based on selenolite,
Configure the calcium sulphate soln of variable concentrations using pure calcium sulfate particle.
6) according to orthogonal design table, first inject, into annular housing 7, the calcium sulphate soln preparing.
7) assay device adding standard column type test specimen 6 and calcium sulphate soln is placed in constant water bath box, according to just
Hand over experiment table setting temperature.In the present embodiment, constant water bath box is along the excircle setting of base 1.
8) by the nitrogen that gas cylinder is passed through containing pressure (containing certain pressure) into annular housing 7, calcium sulphate soln is pressurizeed,
Pressurizeed size is according to orthogonal test table.
9) after reaching test period, take out the standard column type test specimen 6 after corrosion, after drying, weigh quality, measure quality
Change, face crack changes.
10) the standard column type test specimen 6 after corrosion is done crush test using three-axis tester, draw its comprcssive strength.
Finally illustrate, above example only in order to technical scheme to be described and unrestricted, although with reference to relatively
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to the skill of the present invention
Art scheme is modified or equivalent, the objective without deviating from technical solution of the present invention and scope, and it all should be covered at this
In the middle of the right of invention.
Claims (2)
1. multifactor effect descends selenolite to concrete erosion effect test method it is characterised in that adopting one in the method
Plant assay device, this assay device includes base (1), sealing ring (2), hold-down ring (3) and nut cap (4)；Described base (1)
Middle part arranges the uncovered circular cylindrical cavity in a upper end, the bottom setting one of described base (1) and circular cylindrical cavity in vertical direction
The discharge outlet (5) inside communicating；This test method comprises the steps：
1) determine influence factor：Concrete strength, concrete impervious grade, C3A content, hydraulic pressure, temperature and time；
2) according to engineering specifications, hydrogeologic condition and test objective, design the gradient of each factor, set up orthogonal test table；
3) according to test table, configuration varying strength, different seepage-resistant grade, different C3The concrete of A content, is poured with mould and builds up directly
Two standard column type test specimens of the high 100mm of footpath 50mm；One standard column type test specimen is used for doing corrosion testing, another standard
Column type test specimen is used for contrasting；
4) standard column type test specimen (6) being used for doing corrosion testing is placed in circular cylindrical cavity, sealing ring (2) is enclosed within this mark
The top of director circle column type test specimen (6), and hold-down ring (3) is enclosed within the top of this standard column type test specimen (6) and screws in cylinder
Top in shape cavity, bottom compression sealing ring (2) of hold-down ring (3)；Described nut cap (4) screws the top in base (1)
And seal cooperation with base (1), form an annular housing (7) between the top in the top of base (1) and nut cap (4)；
5) it is the result that sulfate radical and concrete occur physics chemical action to the corrosion mechanism of concrete based on selenolite, adopt
Pure calcium sulfate particle configures the calcium sulphate soln of variable concentrations；
6) according to orthogonal design table, first inject, into annular housing (7), the calcium sulphate soln preparing；
7) assay device adding standard column type test specimen (6) and calcium sulphate soln is placed in constant water bath box, according to orthogonal
Experiment table setting temperature；
8) it is passed through the nitrogen containing pressure into annular housing (7) by gas cylinder calcium sulphate soln is pressurizeed, pressurizeed size is according to orthogonal
Test table；
9) after reaching test period, take out standard column type test specimen (6) after corrosion, after drying, weigh quality, measurement quality becomes
Change, face crack changes；
10) standard column type test specimen (6) after corrosion is done crush test using three-axis tester, draw its comprcssive strength.
2. multifactor effect according to claim 1 descends selenolite to concrete erosion effect test method, and its feature exists
In in step 7) in, constant water bath box is along the excircle setting of base (1).
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| CN201510059604.8A CN104614306B (en) | 2015-02-04 | 2015-02-04 | Method for testing corrosion effect of gyprock on concrete under action of multiple factors |
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Citations (2)
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|---|---|---|---|---|
| CN101435816A (en) * | 2008-12-11 | 2009-05-20 | 重庆大学 | Anti-sulphates corrosive test method and test device of cement concrete |
| CN103364313A (en) * | 2013-07-08 | 2013-10-23 | 长沙理工大学 | Testing device and method for determining chloride ion diffusion mechanism of pre-stressed concrete under multi-factor effect |
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| JP3672526B2 (en) * | 2001-12-10 | 2005-07-20 | 株式会社竹中工務店 | Method and apparatus for estimating strength of concrete |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435816A (en) * | 2008-12-11 | 2009-05-20 | 重庆大学 | Anti-sulphates corrosive test method and test device of cement concrete |
| CN103364313A (en) * | 2013-07-08 | 2013-10-23 | 长沙理工大学 | Testing device and method for determining chloride ion diffusion mechanism of pre-stressed concrete under multi-factor effect |
Non-Patent Citations (4)
| Title |
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| 含石膏质岩集料混凝土内部硫酸盐侵蚀评估方法研究;刘江等;《混凝土》;20121231(第5期);全文 * |
| 寒冷地区污水处理工程钢筋混凝土结构耐久性研究;闫波等;《哈尔滨建筑大学学报》;20010430;第34卷(第2期);全文 * |
| 白云岩层中硬石膏岩对隧道结构危害机制研究;刘艳敏等;《岩土力学》;20110930;第32卷(第9期);1-2 * |
| 黄河上游某电站上新统石膏夹层对坝基岩体稳定性影响评价;周洪福等;《工程地质学报》;20061231;第14卷(第1期);全文 * |
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