CN102297821A - Detection apparatus for impermeability of hardened concrete under constraint state, and method thereof - Google Patents
Detection apparatus for impermeability of hardened concrete under constraint state, and method thereof Download PDFInfo
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- CN102297821A CN102297821A CN2011101333658A CN201110133365A CN102297821A CN 102297821 A CN102297821 A CN 102297821A CN 2011101333658 A CN2011101333658 A CN 2011101333658A CN 201110133365 A CN201110133365 A CN 201110133365A CN 102297821 A CN102297821 A CN 102297821A
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Abstract
The invention discloses a detection apparatus for impermeability of hardened concrete under a constraint state, and a method thereof, and belongs to the field of the impermeability of the hardened concrete. In the prior art, the concrete is not under the constraint state when the impermeability of the concrete is detected through the existing experimental apparatus and the existing method, the detection result deviates from the actual result. The purpose of the present invention is to solve the problem in the prior art. The apparatus provided by the present invention comprises a support frame. The support frame is provided with a concrete restraining cracking support. The concrete restraining cracking support is provided with a chloride ion penetration test device. The chloride ion penetration test device comprises a cathode chamber and an anode chamber, wherein both the cathode chamber and the anode chamber comprise binding posts and electrodes. The detection method comprises: detecting the current between the two binding posts through an ammeter, calculating the electric flux to evaluate the impermeability of the formed concrete under the constraint state. According to the present invention, the detection for the impermeability of the hardened concrete is performed under the constraint state, and the theoretical support and the test tool are provided for in-depth study of the durability of the concrete, optimization of mix ratio and structure design of the concrete.
Description
Technical field
The present invention relates to the impervious field of maturing, relate in particular to a kind of apparatus and method that are used to measure maturing anti-permeability performance under the restrained condition.
Background technology
Concrete permeability resistance is to characterize concrete to resist the ability of outside etching medium to the inside concrete diffusion.And the high-strength high-performance concrete early-age shrinkage of widespread use is bigger, can cause that under constraint condition concrete ftractures in early days, and the generation in crack can reduce concrete anti-permeability performance, thereby influences concrete permanance.
At present, the research of concrete impermeability is all carried out under the concrete free state, concrete formation and hardening process are inconsistent in this and the actual engineering, so measurement result departs from reality.Therefore, investigate concrete anti-permeability performance and be the further investigation concrete durability under measurement constraint condition, optimizing concrete mix and structural design provides theory to support and research technique.
Summary of the invention
Concrete is not under restrained condition during at existing experimental provision and method measurement concrete impermeability, measurement result departs from actual situation, the present invention aims to provide maturing anti-permeability performance proving installation and method under a kind of restrained condition, can be the further investigation concrete durability, optimizing concrete mix and structural design provides theoretical support and research technique.
For achieving the above object, technical scheme of the present invention is as follows: maturing anti-permeability performance proving installation under the described restrained condition, and its design feature is to comprise bracing frame, concrete constraint cracking frame is housed on this bracing frame, on concrete constraint cracking frame, the chloride permeability test unit is housed; Described chloride permeability test unit is made up of cathode chamber and anode chamber, and described cathode chamber and anode chamber have included binding post and electrode.
In order to improve the rigidity of proving installation, the arranged outside of described concrete constraint cracking frame has many ribs.
For concrete contraction is played effect of contraction, between described concrete constraint cracking frame and concrete, be equipped with a plurality of screw bolts.
In order to measure accurately and conveniently to fix two utmost point chambers, prevent that chlorion will be diffused into concrete other position under effect of electric field, described cathode chamber and anode chamber preferably are symmetricly set on the both sides of concrete constraint cracking frame.
Support frame as described above comprises flat board and vertical beam, and described concrete constraint cracking frame is fixed on the flat board, and described vertical beam is positioned at the both sides of concrete constraint cracking frame, i.e. each side of concrete constraint cracking frame is equipped with a vertical beam.
In order to prevent that solution temperature raises in the anode, influence the rate of propagation of chlorion, cause measurement result inaccurate, include louvre in described cathode chamber and the anode chamber.
Further, the present invention also provides a kind of method according to maturing anti-permeability performance under the maturing anti-permeability performance proving installation test restrained condition under the above-mentioned restrained condition, and its step comprises:
A). in concrete constraint cracking frame, divide two-layer casting concrete;
B). after 28 days, concrete and concrete constraint cracking frame are together holded up, be fixed on the bracing frame;
C). the chloride permeability test unit is installed in concrete both sides, guarantees that the chloride permeability test unit closely contacts with concrete;
D). the NaCl solution of adding 2.5% ~ 3.5% in cathode chamber (2-6) is preferably 3%; Add the NaOH solution of 0.25mol/L ~ 0.35mol/L in the anode chamber, be preferably 0.3mol/L, impressed DC voltage is 0 ~ 60V, is preferably 60V, and power cathode is connected on the binding post of cathode chamber, and positive source is connected on the binding post of anode chamber;
E). the electric current by between two binding posts of reometer measurement, calculate electric flux according to ASTM C1202-07 method, estimate the concrete anti-permeability performance of restrained condition compacted under with this.
Wherein, in step a), in order to strengthen bolt to concrete effect of contraction, described screw bolt closely contacts with concrete.
In step b), concrete test zone is tied, remove surperficial laitance, so that concrete meeting slight bleeding in surface when moulding prevents that the surface is more loose, cause the inaccurate of measurement result.
In step c), spill in order to prevent two solution in the utmost point chamber, between infiltration experiment device and concrete joint synapsis, be provided with glass cement.
Compared with prior art, the invention has the beneficial effects as follows: the present invention is simple in structure, easy to operate, measure accurately, and under restrained condition, maturing is carried out the anti-permeability performance test, consistent with concrete formation and hardening process in the actual engineering, so measurement result is equal to engineering reality, be the further investigation concrete durability, optimizing concrete mix and structural design provides theoretical support and research technique.
The invention will be further elaborated below in conjunction with drawings and Examples.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is that the A of Fig. 1 is to view;
Fig. 3 is that the B of Fig. 1 is to view;
Fig. 4 is the synoptic diagram of 1 part among Fig. 1;
Fig. 5 is that 4 C is to view;
Fig. 6 is that the D of Fig. 4 is to view;
Fig. 7 is the structural representation of 2 parts among Fig. 1;
Fig. 8 is that the E of Fig. 7 is to synoptic diagram;
Fig. 9 is that the F of Fig. 7 is to synoptic diagram;
Figure 10 is the structural representation of 3 parts among Fig. 1;
Figure 11 is that the G of Figure 10 is to synoptic diagram;
Figure 12 is that the H of Figure 10 is to synoptic diagram.
Embodiment
As shown in Figure 1, device of the present invention is made up of concrete constraint cracking frame 1, chloride permeability test unit 2 and bracing frame 3.Wherein, the outside on concrete constraint cracking frame 1 each limit has all added four rib 1-1,1-2, to improve the rigidity of proving installation, has assembled 14 screw bolt 1-1 inwardly simultaneously on four limits of proving installation concrete shrinkage is played effect of contraction.Chloride permeability test unit 2 is made up of cathode chamber 2-6 and the 2-7 of anode chamber, and the two is a symmetrical structure.Two utmost point chambers comprise binding post 2-2 respectively, and 2-10, electrode 2-3, louvre 2-5 form, and 2-1 place, two utmost point chambers has 4 hole 2-9 respectively.Bracing frame 3 comprises that dull and stereotyped 3-2 and vertical beam 3-1 form.
Concrete method of testing is as follows:
On the ground of smooth level, spread Polypropylence Sheet, concrete constraint cracking frame 1 is positioned on the Polypropylence Sheet, in concrete constraint cracking frame 1, divide two-layer casting concrete 4.In this process, adopt manually to vibrate and guarantee that screw bolt 1-1 closely contacts with concrete.After 28 days or certain length of time, concrete 4 and concrete constraint cracking frame 1 are together holded up, be positioned on the bracing frame 3.With wire brush the test zone of concrete 4 is tied, removed surperficial laitance.Bore 4 hole 1-4 at test zone, corresponding with hole 2-9 respectively.Chloride permeability test unit 2 is placed concrete 4 both sides respectively, make the hole 1-4 of concrete slab and hole 2-9 point-blank.Cooperate with 4 bolt 2-4 and nut 2-8 then chloride permeability test unit 2 and concrete 4 are fixed together, guarantee that chloride permeability test unit 2 closely contacts with concrete 4, seals with glass cement at the two contact position 1-5 then.The NaCl solution of adding 3% in cathode chamber 2-6; The 2-7 of anode chamber adds the NaOH solution of 0.3mol/L, and impressed DC voltage is 60V, and power cathode is connected on the binding post 2-10 of cathode chamber 2-6, and positive source is connected on the binding post 2-2 of the 2-7 of anode chamber.Electric current by between reometer measurement binding post calculates electric flux and estimates the concrete anti-permeability performance of restrained condition compacted under.
Claims (10)
1. maturing anti-permeability performance proving installation under the restrained condition, it is characterized in that, comprise bracing frame (3), concrete constraint cracking frame (1) is housed on this bracing frame (3), on concrete constraint cracking frame (1), chloride permeability test unit (2) is housed; Described chloride permeability test unit (2) is made up of cathode chamber (2-6) and anode chamber (2-7), described cathode chamber (2-6) and anode chamber (2-7) included binding post (2-2,2-10) and electrode (2-3).
2. maturing anti-permeability performance proving installation is characterized in that under the restrained condition according to claim 1, and the arranged outside of described concrete constraint cracking frame (1) has many ribs (1-2).
3. maturing anti-permeability performance proving installation under the restrained condition according to claim 1, it is characterized in that, be equipped with the screw bolt (1-1) that a plurality of contractions to concrete (4) play effect of contraction between described concrete constraint cracking frame (1) and the concrete (4).
4. maturing anti-permeability performance proving installation is characterized in that under the restrained condition according to claim 1, and cathode chamber (2-6) and anode chamber (2-7) are symmetricly set on concrete constraint cracking frame (1) both sides.
5. maturing anti-permeability performance proving installation under the restrained condition according to claim 1, it is characterized in that, support frame as described above (3) comprises flat board (3-2) and vertical beam (3-1), described concrete constraint cracking frame (1) is fixed on the flat board (3-2), and described vertical beam (3-1) is positioned at concrete constraint cracking frame (1) both sides.
6. maturing anti-permeability performance proving installation is characterized in that under the restrained condition according to claim 1, includes louvre (2-5) on described cathode chamber (2-6) and anode chamber (2-7).
7. method according to maturing anti-permeability performance under the maturing anti-permeability performance proving installation test restrained condition under the described restrained condition of one of claim 1-6 is characterized in that its step comprises:
A). in concrete constraint cracking frame (1), divide two-layer casting concrete (4);
B). after 28 days, concrete (4) and concrete constraint cracking frame (1) are together holded up, be fixed on the bracing frame (3);
C). chloride permeability test unit (2) is installed in the both sides of concrete (4), guarantees that chloride permeability test unit (2) closely contacts with concrete (4);
D). the NaCl solution of adding 2.5% ~ 3.5% in cathode chamber (2-6); (2-7) adds the NaOH solution of 0.25mol/L ~ 0.35mol/L in the anode chamber, and impressed DC voltage is 0-60V, and power cathode is connected on the binding post (2-10) of cathode chamber (2-6), and positive source is connected on the binding post (2-2) of anode chamber (2-7);
E). (2-2, the 2-10) electric current between calculate electric flux according to ASTM C1202-07 method, estimate the anti-permeability performance of restrained condition compacted under concrete (4) with this to measure two binding posts by reometer.
8. the method for maturing anti-permeability performance is characterized in that under the test restrained condition according to claim 7, and the test zone of concrete (4) is tied, and removes surperficial laitance.
9. the method for maturing anti-permeability performance is characterized in that under the test restrained condition according to claim 7, is provided with glass cement between infiltration experiment device (2) and concrete (4) contact position (1-5).
10. the method for maturing anti-permeability performance is characterized in that under the test restrained condition according to claim 7, and described screw bolt (1-1) closely contacts with concrete (4).
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| CN 201110133365 CN102297821B (en) | 2011-05-23 | 2011-05-23 | Detection apparatus for impermeability of hardened concrete under constraint state, and method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103376281A (en) * | 2013-07-01 | 2013-10-30 | 河海大学 | Device and method for determining solidified soil chloride ion diffusion coefficient |
| CN110045096A (en) * | 2019-05-27 | 2019-07-23 | 水利部交通运输部国家能源局南京水利科学研究院 | Evaluation temperature gradient leads to the experimental rig and its method of concrete cracking |
| CN111551481A (en) * | 2020-06-08 | 2020-08-18 | 上海市建筑科学研究院有限公司 | Method for testing and characterizing cesium ion permeation resistance effect of concrete protective coating |
| CN114264589A (en) * | 2021-12-29 | 2022-04-01 | 山东交通学院 | Concrete chloride ion permeability resistance detection device and method for field environment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376281A (en) * | 2013-07-01 | 2013-10-30 | 河海大学 | Device and method for determining solidified soil chloride ion diffusion coefficient |
| CN103376281B (en) * | 2013-07-01 | 2015-06-03 | 河海大学 | Device and method for determining solidified soil chloride ion diffusion coefficient |
| CN110045096A (en) * | 2019-05-27 | 2019-07-23 | 水利部交通运输部国家能源局南京水利科学研究院 | Evaluation temperature gradient leads to the experimental rig and its method of concrete cracking |
| CN111551481A (en) * | 2020-06-08 | 2020-08-18 | 上海市建筑科学研究院有限公司 | Method for testing and characterizing cesium ion permeation resistance effect of concrete protective coating |
| CN114264589A (en) * | 2021-12-29 | 2022-04-01 | 山东交通学院 | Concrete chloride ion permeability resistance detection device and method for field environment |
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| CN102297821B (en) | 2013-04-17 |
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