CN201611330U - Tester for concrete chloridion migration diffusion coefficients - Google Patents

Abstract

A tester for concrete chloridion migration diffusion coefficients comprises a main engine and an electronic controller. The main engine comprises an inner jar, an outer jar, a shield, a conductivity sensor, a stirring device, a flange, negative and positive electrodes, wherein the outer jar is arranged on the lower part of the inner jar; the flange is sleeved on the bottom of the outer jar; the shield is arranged above the outer jar; the conductivity sensor is arranged on the top side of the outer jar; the probe of the conductivity sensor is inserted in the outer jar; the stirring device comprises a motor and a stirrer; the motor is fixed on the top of the outer jar; the stirrer is arranged inside the outer jar; the negative electrode is arranged on the bottom of the inner jar; the positive electrode is arranged on the bottom of the outer jar; the top of the shield is provided with an external connector; a negative electrode terminal, the positive electrode terminal, the conductivity sensor and the motor are connected to the external connector through leads; and the external connector is connected to the electronic controller through a cable. The product of the utility model has the advantages of small volume, light weight, portability, simple operation and capability of onsite directly testing the concrete chloridion migration diffusion coefficients.

Description

Concrete chloride ion diffusion mobility coefficient measuring instrument

Technical field

The utility model relates to concrete chloride ion coefficient of diffusion determinator.

Background technology

Chloride is to cause the one of the main reasons that reinforced concrete destroys, and chlorion can produce the reinforcing bar in the xoncrete structure and corrode.In order to measure the ability of concrete opposing chlorion diffusion, common practices is that member is got core, adopts the stable state diffusion experiment to measure the coefficient of diffusion of chlorion in testing laboratory.Concrete grammar mainly contains electrochemical methods (Fick second law), electromigration (Nerst-Planck equation), conductance method (Nernst-Einstein equation method).In the prior art, there is not portable concrete chloride ion coefficient of diffusion determinator, during measurement, need the sampling back in testing laboratory, to operate, can't detect existing structure at the scene, therefore it is little, in light weight to be badly in need of a kind of volume of research and development, the device that can measure the concrete chloride ion coefficient of diffusion at the scene.

The utility model content

The purpose of this utility model provides a kind of concrete chloride ion diffusion mobility coefficient measuring instrument, its volume is little, in light weight, easy to carry, simple to operate, can directly measure the concrete chloride ion coefficient of diffusion at the scene, can obtain reliable result in 2～10 hours, the ability of can be at the scene concrete and other building materials opposing ion being invaded detects assessment.

For achieving the above object, the utility model is by the following technical solutions:

A kind of concrete chloride ion diffusion mobility coefficient measuring instrument, form by main frame and electronic controller, it is characterized in that: main frame is made up of interior jar, outer jar, guard shield, conductivity sensor, stirring apparatus, ring flange and yin, yang electrode, interior jar is elongated, cylindrical, outer jar is short-coarse cylinder shape, the bottom of jar in outer jar is enclosed within, interior jar top and bottom transition position are provided with convex shoulder, this convex shoulder is pressed on the edge of outer jar center pit by O-ring seal, interior jar convex shoulder arranged outside has otic placode, and this otic placode is affixed with outer jar top by bolt; Ring flange is an annular, and outer jar bottom is provided with outward flange, and the ring flange cover is the bottom of jar outside, outward flange by outer pot bottom is spacing, ring flange is provided with double-screw bolt, the corresponding gusset that is provided with on outer jar the end face, and this gusset is affixed by screw and double-screw bolt; Guard shield is a dome-shaped, and guard shield is installed in outer jar top, and Guan end face is provided with lug outside, on lug, the center of guard shield has circular hole to guard shield by screw retention, and interior jar top is exposed to this circular hole, interior jar end face is provided with liquid filling hole, also is provided with liquid filling hole on outer jar the end face; Conductivity sensor is installed on the outer tank deck face, the probe of conductivity sensor stretches in outer jar, and stirring apparatus is made up of motor and stirrer, and motor is fixed on the end face of outer jar, stirrer is arranged on outer jar inside, and the line shaft of motor and the main shaft of stirrer are affixed; Negative electricity is disc very, and positive electricity is annular very, the bottom in negative electrode is arranged on jar, positive electrode is arranged on outer jar bottom, negative electrode by screw retention in interior jar; Interior jar sidewall is provided with the cathode connection terminal, and described negative electrode is connected with the cathode connection terminal by lead, and positive electrode is fixed in outer jar by conductive pole; Outer jar end face is provided with the anode connection terminal, the upper end of conductive pole is provided with thread head, thread head is stretched out by outer tank deck face, be connected with the anode connection terminal, the top of guard shield is provided with the external cabling seat, described cathode connection terminal, anode connection terminal are connected with the external cabling seat by lead respectively, and conductivity sensor, motor also are connected with the external cabling seat by lead respectively, and the external cabling seat is connected with electronic controller by cable.The bottom of jar, outer jar all is provided with O-ring seal in described.

The utility model has following positive beneficial effect: this instrument volume is little, easy to carry, the scene that is applicable to the concrete chloride ion coefficient of diffusion of various strength grades is detected, can on-the-spot detect the top layer chloride diffusion coefficient of any member such as (as the web of ceiling, precast beam) that removes vertically upward, behind the full fully water of concrete, can finish test in 2-10 hour, simple to operate, easy to use, accurately and reliably.

Description of drawings

Fig. 1 is the structural representation of the utility model one embodiment.

Fig. 2 is the upward view of main frame among Fig. 1.

Fig. 3 is the partial sectional view of main frame among Fig. 1.

Fig. 4 is the structural representation after guard shield is removed among Fig. 3.

Fig. 5 is the partial sectional view of Fig. 4.

Fig. 6 is the partial sectional view of Fig. 5.

Fig. 7 is the installation site synoptic diagram of main frame inner conductive post.

Fig. 8 is the transverse sectional view of main frame.

Fig. 9 is the longitudinal sectional view of main frame.

Figure 10 is a principle of work synoptic diagram of the present utility model.

Embodiment

Number in the figure

Jar 4 outer jars of 5 guard shields in 1 main frame, 2 electronic controllers 3

6 conductivity sensors, 7 stirring apparatuss, 8 ring flanges, 9 negative electrodes

10 positive electrodes, 11 convex shoulders, 12 O-ring seals, 13 otic placodes

14 bolts, 15 outward flanges, 16 double-screw bolts, 17 gussets

18 screws, 19 lugs, 20 screws, 21 circular holes

22 liquid filling holes, 23 liquid filling holes, 24 motor, 25 stirrers

26 screws, 27 cathode connection terminals, 28 conductive poles

29 thread heads, 30 anode connection terminals, 31 external cabling seats

32 leads, 33 leads, 34 cables

35 O-ring seals, 36 O-ring seals, 37 concrete

Please refer to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, the utility model is a kind of concrete chloride ion diffusion mobility coefficient measuring instrument, form by main frame 1 and electronic controller 2, main frame is by interior jar 3, outer jar 4, guard shield 5, conductivity sensor 6, stirring apparatus 7, ring flange 8 and the moon, positive electrode 9,10 form, interior jar 3 is elongated, cylindrical, outer jar 4 is short-coarse cylinder shape, the bottom of jar 3 in being enclosed within for outer jar 4, interior jar 3 top and bottom transition position are provided with convex shoulder 11, this convex shoulder 11 is pressed on the center pit edge of outer jar 4 by O-ring seal 12, interior jar 3 convex shoulder 11 arranged outside have otic placode 13 as shown in Figure 8, and this otic placode 13 is affixed with the top of outer jar 4 by bolt 14.

Please refer to Fig. 3, Fig. 4, ring flange 8 is an annular, outer jar 4 bottom is provided with outward flange 15, ring flange 8 covers are the bottom of jar 4 outside, outward flange 15 by outer jar of 4 bottoms is spacing, ring flange 8 is provided with three double-screw bolts 16, correspondingly on outer jar 4 the end face is provided with three gussets 17, and these three gussets 17 are affixed by screw 18 and double-screw bolt 16.

Guard shield 5 is a dome-shaped, guard shield 5 is installed in outer jar 4 top, the end face of jar 4 is provided with three lugs 19 as shown in Figure 3, Figure 4 outside, guard shield 5 is fixed on the lug 19 by screw 20, the center of guard shield 5 has circular hole 21, interior jar 3 top is exposed to this circular hole 21, and interior jar 3 end face is provided with liquid filling hole 22; The end face of jar 4 is provided with liquid filling hole 23 as Fig. 4, shown in Figure 5 outside.

Conductivity sensor 6 is installed on outer jar 4 end faces, the probe of conductivity sensor 6 stretches in outer jar 4, stirring apparatus 7 is made up of motor 24 and stirrer 25, motor 24 is fixed on the end face of outer jar 4, stirrer 25 is arranged on outer jar 4 inside, and the main shaft of the line shaft of motor 7 and stirrer 25 is affixed.Negative electrode 9 is a disc, and positive electrode 10 is an annular, the bottom of jar 3 in negative electrode 9 is arranged on, and positive electrode 10 is arranged on outer jar 4 bottom, and negative electrode 9 is fixed in interior jar 3 by screw 26; Interior jar 3 sidewall is provided with cathode connection terminal 27 as shown in Figure 4, and negative electrode 9 is connected with cathode connection terminal 27 by lead.

Please refer to Fig. 5, Fig. 6, Fig. 7, positive electrode 10 is fixed in outer jar 4 by two conductive poles 28; Outer jar 4 end face is provided with anode connection terminal 30, and the upper end of conductive pole 28 is provided with thread head 29, and thread head 29 is stretched out by outer jar of 4 end faces, is connected with anode connection terminal 30.

Please refer to Fig. 4, the top of guard shield 5 is provided with external cabling seat 31, cathode connection terminal 27, anode connection terminal 30 are connected with external cabling seat 31 by lead 32,33 respectively, conductivity sensor 6, motor 7 also are connected with external cabling seat 31 by lead respectively, and external cabling seat 31 is connected as shown in Figure 1 with electronic controller 2 by cable 34.

Please refer to Fig. 2, Fig. 3, Fig. 8, Fig. 9, interior jar 3, outer jar 4 bottom is respectively arranged with O-ring seal 35,36.Please refer to Fig. 8, during test, at first detected zone is polished, the detected about 300mm * 300mm in zone, detected zone both can be a surface level, also can be facade or inclined-plane, to the water treatment of satisfying in advance of detected zone, disposal route can adopt water spray or use the colligation of band water object to cover, and required time is 18h.After full water treatment is finished, on the concrete 37 in detected zone, bore three apertures that diameter is the dark 40mm of 6.5mm, be fixed on the detected zone with the ring flange 8 of expansion bolt, utilize O- ring seal 35,36 to make concrete 37 face seals in interior jar 3, outer jar 4 and detected zone main frame 1.The sodium chloride solution 425ml of preparation 0.55mol is injected in interior jar 3 by liquid filling hole 22, by liquid filling hole 23 650ml distilled water is injected outer jar 4, then the gland bonnet on the liquid filling hole 22,23 is built.

With cable 34 electronic controller 2 and main frame 1 are connected, begin test.Electronic controller 2 is made of single-chip microcomputer and peripheral circuit, peripheral circuit comprises keyboard circuit, reset circuit, display circuit, booster circuit, booster circuit is by D/A, prime amplifier, step-up transformer is formed, single-chip microcomputer is according to the setting output high-frequency digital signal of program, this high-frequency digital signal is transformed into simulating signal by D/A, after this simulating signal is amplified by prime amplifier, in being added in after boosting by step-up transformer, outer jar 3, the moon in 4, positive electrode 9, on 10, please refer to Figure 10, because interior jar 3, outer jar 4 bottom is respectively arranged with O- ring seal 35,36, so chlorion can only migrate to outer jar 4 by interior jar 3 by the concrete in tested zone, chlorion arrives the speed of outer jar 4 (that is: neutral solutions) and determines by the conductivity of measuring outer jar, in case arrive current stabilization attitude flow, available Nernst-Planck (Nernst-Planck equation) calculates coefficient of diffusion.The Nernst-Planck equation is to be used for being described under ion concentration gradient (Δ X) and the common situation about existing of electric-force gradient (Δ V), passes the equation of the ion flow size (Φ) of permeable membrane.Φ=-D Δ X-PX Δ V, wherein D and P are two groups of constants relevant with gradient magnitude.Detect the required Measuring Time of concrete ionic diffusion coefficient and fluctuate, usually between 2～10h with the quality of measured material.Can make the chlorion that arrives in outer jar 4 mix more evenly by stirring apparatus 7, help improving measuring accuracy with distilled water.Every 10min or conductivity of 15min record, electric current, behind long run test 2～10h, conductivity and time are linear, arrive steady state (SS), and when electric current reached maximal value, test stopped.Draw conductivity and time relation curve then, obtain stable slope promptly Chlorine ion concentration rate of change under the steady state (SS)

Can obtain by the formula of having set up, that is:

$\frac{\mathrm{dc}}{\mathrm{dt}}=5.68\frac{\mathrm{ds}}{\mathrm{dt}}+1.13$

The on-the-spot ionic diffusion coefficient D that detects can try to achieve with the Nernst-Planck formula:

$D=\left(\frac{\mathrm{dc}}{\mathrm{dt}}T\right)\left(\frac{R}{\mathrm{zCFE}}\right)\left(V\frac{L}{A}\right)$

D in the formula---be the ionic diffusion coefficient that the scene is detected, m ²S;

---anode is from change rate of concentration, mol/m ³S;

T---absolute temperature (mean value under the steady state (SS));

R---atmosphere constant, 8.31J/Kmol;

Z---ionic charge (chlorion is-1);

The original concentration of C---ion, 0.55 * 10 ³Mol/m ³

F---Faraday constant, 9.65 * 10 ³C/mol;

E---trial voltage, 60V;

V---inner core volume, 6.5 * 10 ^-4m ³

---pilot region length and area ratio, 3.74m ^-1.

This instrument is applicable to the scene detection of the concrete chloride ion coefficient of diffusion of various strength grades, can finish test in 2-10 hour behind the full fully water of concrete, and is simple to operate, easy to use, accurately and reliably.

Claims (2)

1. concrete chloride ion diffusion mobility coefficient measuring instrument, form by main frame and electronic controller, it is characterized in that: main frame is made up of interior jar, outer jar, guard shield, conductivity sensor, stirring apparatus, ring flange and yin, yang electrode, interior jar is elongated, cylindrical, outer jar is short-coarse cylinder shape, the bottom of jar in outer jar is enclosed within, interior jar top and bottom transition position are provided with convex shoulder, this convex shoulder is pressed on the edge of outer jar center pit by O-ring seal, interior jar convex shoulder arranged outside has otic placode, and this otic placode is affixed with outer jar top by bolt; Ring flange is an annular, and outer jar bottom is provided with outward flange, and the ring flange cover is the bottom of jar outside, outward flange by outer pot bottom is spacing, ring flange is provided with double-screw bolt, the corresponding gusset that is provided with on outer jar the end face, and this gusset is affixed by screw and double-screw bolt; Guard shield is a dome-shaped, and guard shield is installed in outer jar top, and Guan end face is provided with lug outside, on lug, the center of guard shield has circular hole to guard shield by screw retention, and interior jar top is exposed to this circular hole, interior jar end face is provided with liquid filling hole, also is provided with liquid filling hole on outer jar the end face; Conductivity sensor is installed on the outer tank deck face, the probe of conductivity sensor stretches in outer jar, and stirring apparatus is made up of motor and stirrer, and motor is fixed on the end face of outer jar, stirrer is arranged on outer jar inside, and the line shaft of motor and the main shaft of stirrer are affixed; Negative electricity is disc very, and positive electricity is annular very, the bottom in negative electrode is arranged on jar, positive electrode is arranged on outer jar bottom, negative electrode by screw retention in interior jar; Interior jar sidewall is provided with the cathode connection terminal, and described negative electrode is connected with the cathode connection terminal by lead, and positive electrode is fixed in outer jar by conductive pole; Outer jar end face is provided with the anode connection terminal, the upper end of conductive pole is provided with thread head, thread head is stretched out by outer tank deck face, be connected with the anode connection terminal, the top of guard shield is provided with the external cabling seat, described cathode connection terminal, anode connection terminal are connected with the external cabling seat by lead respectively, and conductivity sensor, motor also are connected with the external cabling seat by lead respectively, and the external cabling seat is connected with electronic controller by cable.

2. concrete chloride ion diffusion mobility coefficient measuring instrument as claimed in claim 1 is characterized in that: the bottom of jar, outer jar all is provided with O-ring seal in described.

Images