CN202083614U

CN202083614U - Test device of hardened concrete imperviousness under constrained state

Info

Publication number: CN202083614U
Application number: CN 201120165084
Authority: CN
Inventors: 冯树荣; 李中华; 苏超
Original assignee: Hydrochina Zhongnan Engineering Corp
Current assignee: PowerChina Zhongnan Engineering Corp Ltd; Hydrochina Zhongnan Engineering Corp
Priority date: 2011-05-23
Filing date: 2011-05-23
Publication date: 2011-12-21
Anticipated expiration: 2021-05-23

Abstract

The utility model discloses a test device of hardened concrete imperviousness under a constrained state, belonging to the hardened concrete imperviousness field and aiming at solving the problem that the measuring result is deviated from practical condition as the concrete is not in a constrained state by adopting the existing experimental device and the method. The test device comprises a support bracket, a concrete constraining cracking frame is arranged on the support bracket, and a chloride ion permeability test device is arranged on the concrete constraining cracking frame, and consists of a cathode chamber and an anode chamber which both comprise binding posts and electrodes. The test device is simple in structure, is convenient in operation, is accurate in measurement and can carry out hardened concrete imperviousness test under the constrained state, so as to provide theory support and test means for deeply researching concrete durability and optimizing concrete proportioning and structural design.

Description

The proving installation of maturing anti-permeability performance under a kind of restrained condition

Technical field

The utility model relates to the impervious field of maturing, relates in particular to a kind of proving installation that is 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 utility model aims to provide the proving installation of maturing anti-permeability performance 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, the technical solution of the utility model is as follows: the proving installation of maturing anti-permeability performance under the described restrained condition, its design feature is, 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.

Can test the anti-permeability performance of maturing under the restrained condition according to the proving installation of maturing anti-permeability performance under the above-mentioned restrained condition, its testing procedure 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 beneficial effects of the utility model are: the utility model 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.

Below in conjunction with drawings and Examples the utility model is further elaborated.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

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 described in the utility model 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 1-2,1-3, to improve the rigidity of proving installation, has assembled 14 screw bolt 1-1 inwardly simultaneously on four limits of proving installation concrete 4 has been shunk 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 4.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

1. the proving installation of maturing anti-permeability performance 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. the proving installation of maturing anti-permeability performance 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. the proving installation of maturing anti-permeability performance 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. the proving installation of maturing anti-permeability performance 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. the proving installation of maturing anti-permeability performance 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. the proving installation of maturing anti-permeability performance 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. the proving installation of maturing anti-permeability performance is characterized in that under the restrained condition according to claim 1, is provided with glass cement between infiltration experiment device (2) and concrete (4) contact position (1-5).

8. the proving installation of maturing anti-permeability performance is characterized in that under the restrained condition according to claim 3, and described screw bolt (1-1) closely contacts with concrete (4).