CN203275253U - Cement-based material permeability evaluation system based on non-contact resistivity - Google Patents
Cement-based material permeability evaluation system based on non-contact resistivity Download PDFInfo
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- CN203275253U CN203275253U CN 201320217337 CN201320217337U CN203275253U CN 203275253 U CN203275253 U CN 203275253U CN 201320217337 CN201320217337 CN 201320217337 CN 201320217337 U CN201320217337 U CN 201320217337U CN 203275253 U CN203275253 U CN 203275253U
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Abstract
The utility model relates to a building material detection technology and aims to provide a cement-based material permeability evaluation system based on non-contact resistivity. The system comprises two semicircular slot dies with covers, wherein the semicircular slot dies are butted with each other after penetrating through two coils of a measurement module of a non-contact resistivity tester; a butted joint is sealed by glass cement to prevent a solution from seeping out; two test pieces to be measured form a group and are partially-circular test pieces; the test pieces are arranged in the semicircular slot dies; vaseline for preventing the solution from directly permeating is smeared between the surfaces close to the end parts of the test pieces and the inner walls of the dies; sodium chloride solutions which have the same heights as those of the test pieces are filled into the dies. According to the cement-based material permeability evaluation system, the shortcomings of an existing detection technology can be overcome; the permeability of a cement-based material can be objectively, precisely and reasonably evaluated; furthermore, according to the method, the test pieces are easy to manufacture and operate; the test period is short, and the test cost is low.
Description
Technical field
The utility model belongs to building materials detection technique field, is specifically related to a kind of cement-based material perviousness evaluation system based on contactless resistivity.
Background technology
Cement-based material is one of building materials the most frequently used in modern civil engineering.Improve the military service performance of cement-based material and permanance to having very important significance the serviceable life of improving building structure.At present, the theoretical and experimental investigations of cement-based material permanance has been become the focus of civil engineering work research.Studies show that, the perviousness of cement-based material and permanance have close contact.This is mainly the complexity that perviousness due to cement-based material has determined gas, liquid and various aggressivity ion invasion water cement-based materials inside.The cement-based material impermeability is good, can effectively suppress the infiltration transmission of aggressivity material, and the hydrated product of Erosion prevention ion and cement-based material produces physics and chemical reaction, and corrosion does not occur the protection reinforcing bar, improves the military service performance of structure.So the cement-based material perviousness is to estimate an important indicator of cement-based material permanance always, cement-based material perviousness evaluation method is significant to the permanance of research cement-based material.
At present, the infiltrative testing standard of cement-based material is mainly for concrete material, also not towards clean slurry and the infiltrative test method of mortar and testing standard.Concrete permeability can method of testing roughly can divide and do 3 classes, be i.e. water absorption test, permeability test and ion diffusion test.The water absorption test method is called again initial surface suction method (Initial Surface Absorption Test), and its operation is quick, simple, harmless.But the shortcoming of water absorption test method also has the water absorption test method can only test about concrete topping 10 ~ 15 mm degree of depth except sealing difficulty, can not reflect the permeance property of inside concrete matrix.For low-permeability concrete or high performance concrete, because usually water absorbing capacity is very little, indistinguishable or estimate its perviousness, thus water absorption test method evaluation concrete permeability can and few.China in the concrete permeability detection method, mainly adopts water resistant permeability test method and chloride-penetration resistance test method in " normal concrete long-term behaviour and endurance quality test method standard " (GB/T 50082-2009) at present.The external main standard test method about concrete opposing chloride permeability ability of adopting American Society for testing and materials (ACI) to propose, i.e. concrete opposing chloride permeability merit rating method (ASTM C1202).Water resistant permeability test method in " normal concrete long-term behaviour and endurance quality test method standard " (GB/T 50082-2009) belongs to the permeability test method, the characteristics of the method are simple to operate and calculating simplicity, are suitable for estimating on engineering concrete impermeability.But owing to will concrete being applied certain water pressure in process of the test, might destroy concrete pore texture, affect the concrete permeability evaluation result.Simultaneously, a testing equipment energy applied pressure is also limited, and low-permeability concrete or high performance concrete possibly can't obtain test findings.Chloride-penetration resistance test method in " normal concrete long-term behaviour and endurance quality test method standard " (GB/T 50082-2009) belongs to ion diffusion test method, specifically comprises quick chlorion transport coefficient method (RCM method) and electric flux method.And the external concrete opposing chloride permeability merit rating method (ASTM C1202) that generally adopts is similar with the electric flux method.The chloride-penetration resistance test method is mainly that concrete sample is put into chloride solution, and applies the function of current on concrete sample, belongs to the contact current measuring method.Invasion depth by measuring Chloride Ion in Concrete after certain hour or estimate concrete permeance property by concrete electric weight.The chloride-penetration resistance test method is avoided load application effect on concrete sample, avoids affecting the concrete hole gap structure, and evaluation method is also more accurate.May make inside concrete produce heat but concrete sample is directly applied electric current, affect test result.If concrete permeability is lower, the test duration longer, the overlong time that applies electric current will make the electrolysis of concrete hydrating product, causes that the ion concentration of concrete pore solution changes, and causes larger test error.All there are various defectives in the know-why of above-mentioned these test methods and means of testing, be difficult to efficient, objective, characterize the concrete permeability energy exactly, cause being difficult at present reasonably estimating concrete endurance quality.
The utility model content
The technical problems to be solved in the utility model is, overcomes deficiency of the prior art, and a kind of cement-based material perviousness evaluation system based on contactless resistivity is provided.
Be the technical solution problem, solution of the present utility model is:
Provide a kind of the utility model that a kind of system that estimates based on the cement-based material perviousness of contactless resistivity further is provided, comprise the contactless resistivity tester measurement module and the contactless resistivity tester resistivity analysis module and the computing machine that is attached thereto that are connected by wire; This system also comprises two with the semi-circular groove mould of lid, and the semi-circular groove mould docks after passing two coils of contactless resistivity tester measurement module, and its joint is tight to prevent that solution from oozing out with the glass cement sealing; 2 of test specimens to be measured are one group, are all that radius is the part girth annular test specimen of 122.5mm; Test specimen to be measured is positioned in the semi-circular groove mould, is coated with vaseline between near each surface of test piece end and mould inner wall and is used for preventing the direct infiltrate of solution; Be perfused with the sodium chloride solution with the test specimen equal height in mould.
In the utility model, the arc angle of described test specimen part girth annular is π/4 ~ pi/2.
In the utility model, the radial section of described sample is that trapezoidal, trapezoidal base, the cross section length of side is 37mm, and the top length of side is 47mm, and height is 54.5mm.
Cement-based material perviousness evaluation method in the utility model comprises the following steps:
(1) preparation of cement-based material test specimen to be measured:
Cement-based material test specimen to be measured is that radius is the part girth annular test specimen of 122.5mm; The test specimen that configures is put into 20 ℃ ± 2 ℃, the standard curing room maintenance of relative humidity 95%RH, specifying test specimen is put into the thermostatic drying chamber of 105 ℃ the length of time, dried 2 days, then took out cooling 1 hour;
(2) measure front preparation:
Two semi-circular groove moulds are positioned on contactless resistivity tester, and joint is tight to prevent that solution from oozing out with the glass cement sealing; Whether 2 of test specimens to be measured are one group, put into groove mould after smearing vaseline near each surface of test piece end, seal tight to prevent the direct infiltrate of solution between inspection test specimen and mould side wall;
(3) resistivity detects
The sodium chloride solution of perfusion and cement-based material test specimen equal height, then use closed with covers in mould; Set the sample frequency of contactless Instrument Measuring Resistivity of Carbon Products, measure cement-based material test specimen resistivity curve over time, record the time that test specimen resistivity catastrophe point occurs;
(4) perviousness evaluation
Calculate sodium chloride solution by the infiltration rate V of test specimen according to following formula, evaluate the permeance property of cement-based material test specimen with this:
In formula: L is the arc length of sample; θ is arc angle corresponding to sample; R is the sample radius; T is that the sample resistivity rate of change reached for-5 corresponding times of Ω m/min, i.e. sample resistivity time of undergoing mutation.
The concentration of described sodium chloride solution is 1 ~ 2mol/L; The sample frequency of described contactless Instrument Measuring Resistivity of Carbon Products is 0.1 ~ 1Hz; If measure concrete permeance property, the coarse aggregate that preparation cement-based material test specimen to be measured uses is that particle diameter is the rubble of 5～20 mm continuous gradings.
Compared with prior art, the beneficial effects of the utility model are:
The method adopts contactless resistivity measurement technology, namely can to the effect of cement-based material test specimen load application, also can directly not apply the function of current to the cement-based material test specimen.Simultaneously, the utility model not only can be applied to concrete material, can also be used for measuring the perviousness of the cement-based materials such as clean slurry, mortar, both can estimate the permeance property of Portland cement sill, also be applicable to estimate the perviousness of high-strength or high performance cement-based material.The utility model can overcome the deficiency that existing detection technique exists, objective, as to estimate accurately and reasonably cement-based material perviousness, and the method test material preparation is simple, and simple to operate, the test period is shorter, and experimentation cost is low.
Description of drawings
Fig. 1 is cement-based material permeance property proving installation; Wherein: the contactless resistivity tester measurement module of 1-; 2-cement-based material test specimen; The 3-sodium chloride solution; The contactless resistivity tester resistivity of 4-analysis module; The 5-computing machine;
Fig. 2 is cement paste sample size in case study on implementation 1 (mm of unit);
Fig. 3 is definite method of resistivity-time curve, resistivity speed-time curve and the sample resistivity mutation time of a cement-based material sample in case study on implementation 1;
Fig. 4 is the infiltration rate in concrete sample different length of times in case study on implementation 3.
Embodiment
The system that estimates based on the cement-based material perviousness of contactless resistivity in the utility model comprises the contactless resistivity tester measurement module 1 and the contactless resistivity tester resistivity analysis module 4 and the computing machine 5 that is attached thereto that are connected by wire; Also comprise two with the semi-circular groove mould of lid, the semi-circular groove mould docks after passing two coils of contactless resistivity tester measurement module 1, and its joint is tight to prevent that solution from oozing out with the glass cement sealing; Cement-based material test specimen 2 to be measured take two as one group, is all that radius is the part girth annular test specimen of 122.5mm; Test specimen to be measured is positioned in the semi-circular groove mould, is coated with vaseline between near each surface of test piece end and mould inner wall and is used for preventing the direct infiltrate of solution; Be perfused with the sodium chloride solution 3 with the test specimen equal height in mould.
The arc angle of test specimen part girth annular is π/4 ~ pi/2, and its radial section is that trapezoidal, trapezoidal base, the cross section length of side is 37mm, and the top length of side is 47mm, and height is 54.5mm.If measure concrete permeance property, the coarse aggregate that preparation cement-based material test specimen to be measured uses is that particle diameter is the rubble of 5～20 mm continuous gradings.
Cement-based material perviousness evaluation method based on contactless resistivity comprises the following steps:
(1) preparation of cement-based material test specimen to be measured:
Cement-based material test specimen to be measured is that radius is the part girth annular test specimen of 122.5mm; The test specimen that configures is put into 20 ℃ ± 2 ℃, the standard curing room maintenance of relative humidity 95%RH, specifying test specimen is put into the thermostatic drying chamber of 105 ℃ the length of time, dried 2 days, then took out cooling 1 hour;
(2) measure front preparation:
Two semi-circular groove moulds are positioned on contactless resistivity tester, and joint is tight to prevent that solution from oozing out with the glass cement sealing; Whether 2 of test specimens to be measured are one group, put into groove mould after smearing vaseline near each surface of test piece end, seal tight to prevent the direct infiltrate of solution between inspection test specimen and mould side wall;
(3) resistivity detects
The sodium chloride solution of 1 ~ 2mol/L of perfusion and cement-based material test specimen equal height, then use closed with covers in mould; The sample frequency of setting contactless Instrument Measuring Resistivity of Carbon Products is 0.1 ~ 1Hz, measures cement-based material test specimen resistivity.
When finding that sudden change appears in the cement-based material sample resistivity, and during resistivity decreased to 0 Ω m left and right, finish test.Draw cement-based material sample resistivity and time curve (R-T curve) according to the data of computer acquisition, and drafting cement-based material sample resistivity rate of change and the relation curve of time, the resistivity decreased amplitude that records per minute is the time T of 5 Ω m, be that cement-based material sample resistivity rate of change reached for-5 corresponding times of Ω m/min, think that time T is the time that the cement-based material sample resistivity is undergone mutation, and is accurate to s.Revision test is until 1 group of sample (2) mensuration is complete.
(4) perviousness evaluation
Calculate sodium chloride solution by the infiltration rate V of test specimen according to following formula, with this permeance property of evaluating the cement-based material test specimen, be accurate to 10
-9M/s.
In formula: L is the arc length of sample; θ is arc angle corresponding to sample; R is the sample radius; T is that the sample resistivity rate of change reached for-5 corresponding times of Ω m/min, i.e. sample resistivity time of undergoing mutation.
Get the arithmetic mean of every group of 2 samples as the cement-based material infiltration rate of this group sample in this length of time.When measuring cement-based material sample resistivity mutation time, if cement-based material test specimen resistivity do not undergo mutation, but slow decreasing, should group sample test result invalid.When calculating the cement-based material infiltration rate, if when the difference of 2 measured values and this group sample arithmetic mean value surpassed 15%, this group sample test result was invalid.
Case study on implementation 1:
Adopt detection method of the present utility model to investigate the permeance property of cement paste.The noncontact resistivity tester that uses is the CCR2 type tester that Science and Technology Ltd. of middle weighing apparatus port section (Shenzhen) produces.The water cement ratio of cement paste is 0.60, and curing age is 7d.Every group of cement paste adopts 2 test specimens, and the arc angle that test specimen is corresponding is pi/2, and concentration of sodium chloride solution is 1mol/L, and sample frequency is 0.167Hz.Wherein, 52.5 grades of Portland cements of PO that cement adopts Hubei Huaxin Cement Factory to produce, specific surface area is 350 m
2/ kg; Water is tap water.Resistivity mutation time and the infiltration rate test result of cement paste sample can see Table 1.
Table 1 cement paste infiltration rate test result
| Sample number into spectrum | Resistivity mutation time T (s) | Infiltration rate V (10 -6m/s) |
| 1 | 12006 | 4.007 |
| 2 | 12024 | 4.003 |
| Test result | 12015 | 4.005 |
By Fig. 3 and table 1 as can be known, adopt the utility model to measure the perviousness of cement-based material easy to operate, data are processed simple, and test period is shorter, and the test findings discreteness is little, and test result is more accurate.When specifically carrying out the evaluation of cement-based material permeance property, only need to adopt an a kind of test parameters to be analyzed, can react the permeance property of different cement-based material, illustrate that detection method of the present utility model is practicable.
Case study on implementation 2:
Adopt detection method of the present utility model to investigate the permeance property of cement paste.The noncontact resistivity tester that uses is the CCR2 type tester that Science and Technology Ltd. of middle weighing apparatus port section (Shenzhen) produces.The water cement ratio of cement paste is respectively 0.60,0.53 and 0.45, and curing age is 28d.Every group of cement paste adopts 2 test specimens, and the arc angle that test specimen is corresponding is pi/2, and concentration of sodium chloride solution is 1mol/L, and sample frequency is 0.167Hz.Wherein, 52.5 grades of Portland cements of PO that cement adopts Hubei Huaxin Cement Factory to produce, specific surface area is 350 m
2/ kg; Water is tap water.Resistivity mutation time and the infiltration rate test result of cement paste sample can see Table 2.
Table 2 Different Water-Cement Ratio cement paste resistivity mutation time and permeance property
Table 2 shows, if adopt identical cement-based material, along with water cement ratio reduces, the clean slurry phase resistivity mutation time that water cement ratio is high increases, and infiltration rate reduces, and illustrates that its impermeability of cement paste of low water-cement ratio is good, and this phenomenon conforms to present theoretical and experimental investigations.The cement-based material permeance property evaluation method that this explanation the utility model proposes can be applied to cement paste, and can reflect that the parameters such as water cement ratio are on the impact of cement-based material permeance property.
Case study on implementation 3:
Adopt detection method of the present utility model to investigate concrete permeance property.The noncontact resistivity tester that uses is the CCR2 type tester that Science and Technology Ltd. of middle weighing apparatus port section (Shenzhen) produces.Concrete match ratio can see Table 3, tests respectively the infiltration rate of concrete 12h, 18h, 1d, 2d, 3d, 7d, 14d and 28d.Every group of cement paste adopts 2 test specimens, and the arc angle that test specimen is corresponding is pi/2, and concentration of sodium chloride solution is 1mol/L, and sample frequency is 0.167Hz.Wherein, 52.5 grades of Portland cements of PO that cement adopts Hubei Huaxin Cement Factory to produce, specific surface area is 350 m
2/ kg; Fine aggregate adopts river sand, and fineness modulus is 2.5-2.6; Coarse aggregate adopts the rubble of 5～20 mm continuous gradings; Water is tap water.The resistivity mutation time of cement paste sample and the visible Fig. 4 of infiltration rate test result.
Table 3 concrete mix
| The match ratio numbering | Water cement ratio | Cement (kg/m 3） | Water (kg/m 3） | Sand (kg/m 3） | Rubble (kg/m 3） |
| PC | 0.6 | 351 | 211 | 735 | 1102 |
As shown in Figure 4, along with development in the length of time, the concrete infiltration rate will constantly reduce, show that concrete anti-permeability performance is along with improve constantly the length of time, this conforms to present theoretical and experimental investigations, show that the cement-based material anti-permeability performance method of testing that the utility model proposes also can be applied to concrete, and can react the development and change of concrete impermeability with the length of time.
In assay method of the present utility model, the cement-based material test specimen was dried 2 days in the thermostatic drying chamber of 105 ℃, but can effectively remove the evaporation water in the cement-based material test specimen, stoped the continuation aquation of cement-based material.This temperature conditions can not cause chemical absorbed water and the constitution water volatilization of gelinite inside in cement-based material simultaneously, thereby causes the gelinite excessive deformation to affect the cement-based material micropore structure.Therefore, adopt the micropore structure of in the thermostatic drying chamber of 105 ℃, the cement-based material test specimen being processed effectively " curing " cement-based material.The cement-based material test specimen is positioned in the mould of contactless resistivity tester, and cement-based material test specimen and mould inner wall are sealed by vaseline, can effectively prevent sodium chloride solution along cement-based material test specimen and mould inner wall gap infiltration, thereby guarantee that sodium chloride solution can only be by the infiltration of cement-based material test specimen.After super-dry is processed, the pore water of cement-based material test specimen inside all volatilizees, and ion can't free migration in cement-based material inside, can be with the approximate electrical insulator of regarding as of cement-based material test specimen.The sodium chloride solution ions content that is poured in mould inside is high, and under the effect of externally-applied magnetic field, inner ion migration can be similar to the good conductor of regarding electricity as rapidly.Before on-test, sodium chloride solution does not penetrate into cement-based material inside, and the ion migration of sodium chloride solution inside is subject to cement-based material and intercepts, and can't form effective path, and the resistivity of material that therefore adopts contactless resistivity tester to record is higher.When sodium chloride solution was penetrated into gradually inside concrete and connects the cement-based material test specimen, the ion in solution can form connection circuit by the pore solution fast transferring that is communicated with, and the resistivity of material will sharply descend this moment.Begin to penetrate into cement-based material from sodium chloride solution and begin time of sharply descending to resistivity of material, be exactly that the sodium chloride solution infiltration connects the time that the cement-based material test specimen consumes, and sodium chloride solution has just characterized the permeance property of cement-based material by the speed of cement-based material test specimen.Therefore contactless resistivity meter does not directly apply electric current in cement-based material test specimen and sodium chloride solution, can not affect ion concentration in solution and the pore texture of cement-based material, and is more accurate to the evaluation of test findings.Simultaneously, contactless resistivity meter has very high sensitivity, accurate time of sharply descending of capture material resistivity, and realize automatically gathering, easy and simple to handle, need not manual control, the subsequent treatment of data result is also very simple.The radian that cement-based material test specimen in test is corresponding should be not excessive, crosses senior general and cause the overlong time tested, reduces the efficient of test.But the radian that Water In The Experiment cement-based material test specimen is corresponding should be not too short yet, otherwise the random pore defective in the cement-based material test specimen reduces the precision of test findings with the time of appreciable impact sodium chloride solution by concrete sample.The concentration of sodium chloride solution should be not too high or too low yet, and too high resistivity decreased amplitude is not remarkable, and the time that affects sodium chloride solution infiltration water cement-based material test specimen gathers.If the sodium chloride solution ion concentration is too low, after forming communication path, a little less than the ion transfer ability, concrete resistivity will slowly lower and not mutated, affect reading of Lifetime.The utility model is applicable to common performance and the high-performance mensuration of slurry, mortar and concrete material permeance property only.
Claims (3)
1. based on the cement-based material perviousness evaluation system of contactless resistivity, comprise the contactless resistivity tester measurement module and the contactless resistivity tester resistivity analysis module and the computing machine that is attached thereto that are connected by wire, it is characterized in that, this system also comprises two with the semi-circular groove mould of lid, the semi-circular groove mould docks after passing two coils of contactless resistivity tester measurement module, and its joint is tight to prevent that solution from oozing out with the glass cement sealing; Test specimen to be measured take 2 as one group, is all that radius is the part girth annular test specimen of 122.5mm; Test specimen is positioned in the semi-circular groove mould, is coated with vaseline between near each surface of test piece end and mould inner wall and is used for preventing the direct infiltrate of solution; Be perfused with the sodium chloride solution with the test specimen equal height in mould.
2. system according to claim 1, is characterized in that, the arc angle of described test specimen part girth annular is π/4～pi/2.
3. system according to claim 1, is characterized in that, the radial section of described test specimen is that trapezoidal, trapezoidal base, the cross section length of side is 37mm, and the top length of side is 47mm, and height is 54.5mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267719A (en) * | 2013-04-25 | 2013-08-28 | 浙江大学 | Method and system for non-contact electrical resistivity-based evaluation of permeability of cement-based material |
| CN105842141A (en) * | 2014-12-16 | 2016-08-10 | 天津大学 | Method for measuring infiltration rate of ions in concrete |
| CN109001262A (en) * | 2018-09-21 | 2018-12-14 | 浙江大学 | Hydrated cementitious degree dynamic monitoring system and method based on resistivity |
| CN109100270A (en) * | 2018-08-29 | 2018-12-28 | 大连海事大学 | A kind of annular fluid channel oil liquid detection device and preparation method thereof |
| US11391560B2 (en) * | 2019-05-08 | 2022-07-19 | Guangxi University | Image acquisition device and measuring method for geometric parameters of specific developing area on concrete test blocks |
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2013
- 2013-04-25 CN CN 201320217337 patent/CN203275253U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267719A (en) * | 2013-04-25 | 2013-08-28 | 浙江大学 | Method and system for non-contact electrical resistivity-based evaluation of permeability of cement-based material |
| CN105842141A (en) * | 2014-12-16 | 2016-08-10 | 天津大学 | Method for measuring infiltration rate of ions in concrete |
| CN109100270A (en) * | 2018-08-29 | 2018-12-28 | 大连海事大学 | A kind of annular fluid channel oil liquid detection device and preparation method thereof |
| CN109100270B (en) * | 2018-08-29 | 2020-10-02 | 大连海事大学 | Annular micro-channel oil liquid detection device and manufacturing method thereof |
| CN109001262A (en) * | 2018-09-21 | 2018-12-14 | 浙江大学 | Hydrated cementitious degree dynamic monitoring system and method based on resistivity |
| US11391560B2 (en) * | 2019-05-08 | 2022-07-19 | Guangxi University | Image acquisition device and measuring method for geometric parameters of specific developing area on concrete test blocks |
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Granted publication date: 20131106 |