KR101709955B1 - Test device and method for carbonation of concrete - Google Patents

Abstract

The present invention provides a test device and a test method for carbonation of concrete. The test device for carbonation of concrete is able to easily measure a carbonation depth of concrete using a compact device. According to the present invention, the test device for carbonation of concrete comprises: a hollow dust suppressing unit having a plurality of dust grooves along an inner circumference of a transparent material, having a shape of a truncated cone vertically open in order for a drill on which an indication line is displayed to be inserted; one or more protection units having a ring shape, and arranged on both surfaces of the upper part of the dust suppressing unit; a measuring unit; and a coupling unit. The measuring unit comprises: a measuring member of a pipe shape; an inner protrusion member extended from the inner surface of a lower part of the measuring member towards a center shaft of the measuring member; a measuring hole formed on an outer circumference of the measuring member in a longitudinal direction; and a plurality of measuring gradations displayed on a right and a left of the measuring hole on the measuring member. The coupling unit comprises: a first coupling member inserted into the dust suppressing unit, and coupled to the lower part of the measuring member to rotate; and a second coupling member coupled to the upper part of the measuring member to rotate. The test device for carbonation of concrete injects phenolphthalein into the inner circumference of the dust suppressing unit.

Description

TECHNICAL FIELD [0001] The present invention relates to a concrete carbonation test apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete carbonation test apparatus and a test method thereof, and more particularly, to a concrete carbonation test apparatus for measuring the depth of carbonation of a concrete with a compact equipment and a test method thereof.

Concrete absorbs carbon dioxide in the air from the surface, and when the calcium hydroxide in the concrete changes into calcium carbonate, it loses its alkalinity. This phenomenon is called carbonation or neutralization. When the passive film wrapping the surface of the reinforcing steel is destroyed by the carbonation of concrete, Corrosion begins and shortens the life of concrete.

The mechanism of carbonation of concrete is as follows: Carbon dioxide penetration -> carbonation (neutralization) -> passive film destruction of reinforcing bar -> corrosion of reinforcing steel -> volume expansion of reinforcing steel -> concrete cracking, ) ₂ (calcium hydroxide a) + CO ₂ = CaCO ₃ (calcium carbonate) + H ₂ O.

Before the progress of carbonation, the calcium hydroxide originally has a pH value of about 12 to 13, and a portion of calcium hydroxide that has been changed to calcium carbonate due to the carbonation phenomenon is lowered to about 8.5 to 10 to be neutralized.

If the pH inside the concrete is 11 or higher, it does not rust if oxygen is present. However, when the pH is lower than 11, rust is generated in the reinforcing bar and the reinforcing bar is expanded to about 2.5 times the original volume.

As a method of checking the carbonation of concrete, when the 1% solution of phenolphthalein as the test reagent meets and reacts with the alkaline substance, it changes into red color, and the phenolphthalein solution is sprayed on the concrete to visually observe the change of color .

When 1% solution of phenolphthalein is sprayed on concrete, it is colorless at pH 9 or lower, and red at higher pH value, so it can be very easily identified. This method can be used to collect specimens from concrete structures in core form or powder form A hole is drilled in the concrete structure and it is directly inspected in the field.

In the case of measuring the depth of carbonation using concrete powder falling down the hole of a concrete structure, two workers work together as a team. One person works with the carbonated paper under the hole And the other worker drills a hole in the concrete structure using a hammer drill, so that the concrete powder falling from the carbonation test hole collects on the carbonation reaction pile.

When the carbonation test hole is drilled and the 1% solution of phenolphthalein, which is a test reagent, is sprayed on the carbonation reaction paper, a red color reaction occurs in the area where carbonation does not proceed and a colorless reaction occurs in the carbonation area. The depth of the carbonation can be determined by measuring the length of the arc where the reaction has been observed and then applying the ratio of the arc length of the entire arc shape of the concrete powder to the depth of the carbonation test hole to the colorless length of the arc.

However, since such a conventional measurement method requires two people to work together, there is a problem that the measurement becomes inaccurate if the speed of perforating the carbonation test hole and the speed of rotating the carbonation reaction paper are not matched with each other, The labor cost required for the measurement is increased.

(Patent Document 1) KR10-1578756 B1

(Patent Document 2) KR10-1669609 B1

(Patent Document 3) KR10-0686495 B1

Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to solve the following problems.

A concrete carbonation test apparatus and its test method which can easily measure the depth of carbonation of concrete with compact equipment are provided.

A concrete carbonation test apparatus capable of visually confirming the carbonation of concrete caused by discoloration by spraying phenolphthalein on the inner circumferential surface of a measuring portion of a transparent material, and a test method thereof.

It is intended to provide a concrete carbonation test apparatus and a test method thereof, which can instantaneously confirm the depth of carbonation of concrete by confirming the numerical value of the measurement scale indicated by the leader of the drill when the color change is caused by the reaction between concrete dust and phenolphthalein.

According to an aspect of the present invention, there is provided a vacuum cleaner comprising: a hollow dust suppressing part formed in a plurality of dust grooves along an inner circumferential surface of a transparent material and having a truncated conical shape opened to vertically insert a drill marked with a leader; An inner protruding member extending from the inner bottom surface of the measuring member toward the center axis of the measuring member, and a protruding member extending in the longitudinal direction on the outer circumferential surface of the measuring member, A first fastening member inserted into the dust suppressing portion and rotatably coupled with the lower portion of the measurement member, and a second fastening member inserted into the dust suppressing portion and rotationally coupled with the lower portion of the measurement member, And a fastening portion including a second fastening member rotatably coupled to an upper portion of the dust- Provides, concrete carbonation test device characterized in that the injection of phenolphthalein.

Further, the concrete carbonation test apparatus includes: an elastic part having elasticity; And an insertion fixing part including a tubular insertion fixing member into which the elastic part is inserted and an outer protruding member extending radially from an upper outer surface of the insertion fixing member.

In addition, when drilling the concrete through the protector, the measurement unit, and the coupling unit, discoloration is determined according to the reaction between the concrete dust generated from the concrete and the phenolphthalein, and the discoloration of the concrete dust and the phenolphthalein In the case of discoloration by the reaction, it is preferable to measure the depth of carbonation of the concrete by reading the measurement scale corresponding to the leader line.

(A) spraying phenolphthalein on the inner peripheral surface of the dust-suppressing portion; (b) positioning a lower portion of the dust suppression portion in contact with the concrete; (c) inserting a drill having a leader line into the dust-suppression unit and placing the drill in contact with the concrete; And (d) reading a numerical value corresponding to a plurality of measurement graduations displayed on the left and right of the measurement hole on the measuring member at the time point when the concrete dust generated by the drill rotated by the concrete reacts with the phenolphthalein to discolor, And measuring the carbonation depth of the concrete.

As described above, the concrete carbonation test apparatus and the test method thereof according to the present invention can easily and quickly measure the carbonation degree and depth while adopting a compact structure.

Also, in the concrete carbonation test apparatus and the test method thereof according to the present invention, phenolphthalein is sprayed on the inner circumferential surface of the transparent part of the measurement unit to visually confirm the carbonation of the concrete due to discoloration.

Also, when the concrete carbonation test apparatus and the test method thereof according to the present invention are discolored due to the reaction between concrete dust and phenolphthalein, the depth of carbonation of the concrete can be immediately confirmed by checking the numerical value of the measurement scale indicated by the leader line of the drill .

In addition, the concrete carbonation test apparatus and the test method thereof according to the present invention can prevent the concrete dust from scattering to the surroundings when the drill is drilled by introducing the transparent material measuring unit.

1 is a view showing a process of measuring carbonation of concrete according to the prior art.
2A is an exploded perspective view showing a concrete carbonation test apparatus according to a first embodiment of the present invention.
2B is an exploded perspective view showing a concrete carbonation test apparatus according to a second embodiment of the present invention.
FIG. 3A is an exploded sectional view of FIG. 2A.
Figure 3b is a cross-sectional view of Figure 2a.
4A is an exploded cross-sectional view of FIG. 2B.
FIG. 4B is an assembled cross-sectional view of FIG. 2B. FIG.
5 is a view showing application of a concrete carbonation test apparatus according to a first embodiment of the present invention to concrete.
6 is a flowchart showing a concrete carbonation test method of the present invention.

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, the definitions of these terms should be described based on the contents throughout this specification.

In addition, the described embodiments are provided for illustrative purposes and do not limit the scope of the present invention.

The constituent elements of the concrete carbonation test apparatus according to the present invention can be used integrally or separately. In addition, some components may be omitted depending on the usage pattern.

1. Concrete Carbonation  Components of the test apparatus (first Example )

Hereinafter, a concrete carbonation test apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 2A, 3A, and 3B.

The concrete carbonation test apparatus 100 according to the first embodiment of the present invention includes a dust suppression unit 110, a protection unit 120, a measurement unit 130, and a coupling unit 140.

More specifically, in the concrete carbonation test apparatus 100 according to the first embodiment of the present invention, a plurality of dust grooves 111 are formed along an inner circumferential surface of a transparent material, and a drill 20, A hollow shaped dust suppressing portion 110 which is opened and closed in a vertically opened manner, at least one protective portion 120 in the form of a ring disposed on both upper surfaces of the dust suppressing portion 110, a pipe shaped measuring member 131, An inner protruding member 132 extending from the lower inner side surface of the measuring member 131 toward the central axis of the measuring member 131, a measuring hole 133 formed in the longitudinal direction on the outer peripheral surface of the measuring member 131, A measurement unit 130 including a plurality of measuring graduations 134 displayed on the left and right of the merchant measurement hole 133, a measurement unit 130 inserted into the dust suppression unit 110, The first fastening member 141 to be coupled and the second fastening member 141 to be rotatably engaged with the upper portion of the measuring member 131, And a fastening portion 140 including a fastening portion 142.

According to the present invention, when drilling the concrete 10, the drill 20 passing through the protective part 120, the measurement part 130, and the fastening part 140 can remove the concrete dust generated from the concrete 10 When the discoloration of the concrete 10 is determined by the reaction of phenolphthalein and the discoloration is caused by the reaction of the concrete dust and the phenolphthalein, the depth of carbonation of the concrete 10 is measured by reading the measurement scale 134 corresponding to the leader 21.

The dust suppressing portion 110 is formed in a hollow truncated conical shape so as to insert the drill 20 indicated by the leader 21 therein. In particular, since the dust suppressing portion 110 is made of a transparent material, the internal state of the dust suppressing portion 110 can be confirmed from outside.

Phenolphthalein is sprayed in a liquefied state on the inner circumferential surface of the dust suppressing portion 110. Here, phenolphthalein is a reagent for measuring the degree of carbonation (= neutralization) of concrete dust generated when the drill 20 drills the concrete 10, and when the concrete dust is strongly alkaline, it reacts and discolors.

According to the present invention, when compared with the prior art, it is possible to identify the degree of carbonation of the concrete dust from the outside, while preventing the surrounding environment from becoming dirty due to the concrete dust by the dust reduction unit 110, outstanding.

The dust grooves 111 are formed in a plurality of along the inner circumferential surface of the transparent material. More specifically, the dust grooves 111 are formed on the inner peripheral surface of the dust-suppressing portion 110 so as to be spaced apart from the upper portion of the dust-suppressing portion 110 by a predetermined distance. At this time, it is particularly preferable that the dust grooves 111 are formed parallel to the upper surface of the dust suppressing portion 110. The dust grooves 111 are formed in such a manner that the flow of phenolphthalein sprayed on the inner peripheral surface of the dust suppressing portion 110 is minimized .

That is, the dust groove 111 reacts with the phenolphthalein as the concrete dust moves to the inner peripheral surface of the dust-suppressing portion 110 and the dust groove 111 in the state of receiving the sprayed phenolphthalein. Therefore, when the phenolphthalein and the concrete dust react with each other, the dust-suppressing portion 110 is discolored clearly along the dust groove 111 when viewed from the outside, so that the operator can easily identify the carbonation of the concrete.

The protector 120 is ring-shaped and has one or more protrusions arranged on both upper surfaces of the dust suppression portion 110 as shown in FIG. 3B. The protection unit 120 may be a rubber washer. The protection unit 120 may be disposed between the dust suppression unit 110 and the measurement unit 130, and may include a dust suppression unit 110, 1 fastening member 141 to provide buffering action between the components.

The measuring unit 130 includes a measuring member 131, an inner protruding member 132, a measuring hole 133, and a measuring scale 134.

The measuring member 131 is in the shape of a hollow pipe as shown in Fig. 3A. The diameter of the measuring member 131 is formed larger than the drill 20 so that the drill 20 can be sufficiently inserted.

The inner protruding member 132 extends from the inner bottom surface of the measuring member 131 toward the center axis of the measuring member 131 as shown in Fig. 3A. The diameter of the inner protruding member 132 is smaller than the diameter of the measuring member 131 and a thread is formed on the inner circumferential surface of the inner protruding member 132, And is coupled in a tooth-like manner while rotating.

The measuring hole 133 is formed in the longitudinal direction on the outer peripheral surface of the measuring member 131 as shown in Fig. The measurement hole 133 may be formed by inserting the drill 20 into the measuring member 131 to drill the concrete 10 and checking the leader 21 at a point of time when the concrete dust generated after the concrete 10 reacts with the phenolphthaleane is discolored. . At this time, the numerical value of the measurement scale 134 coinciding with the leader 21 is the carbonation depth of the concrete 10.

The measurement graduations 134 are displayed to the left and right of the measurement hole 133 on the measurement member 131 as shown in FIG. 2A. At this time, the intervals of the measurement graduations 134 can be applied as short or wide as necessary, and the units can be applied in terms of centimeters (cm), millimeters (mm), nanometers (nm)

In addition, in the present invention, the measurement scale 134 is divided into right and left sides of the measurement member 131, because the reference point to be measured may vary depending on the situation.

Therefore, the measurement scale displayed on one side of the measurement scale 134 according to the present invention is marked so as to become larger from the left side to the right side, and the measurement scale displayed on the other side can be expressed so as to become larger from the right side to the left side And it is also possible to apply such a change of the measurement scale.

Accordingly, the worker is able to perform the measurement with the measuring scale 134 (corresponding to the indicator 21 displayed on the drill 20) when the concrete dust generated when the drill 20 drills the concrete 10 reacts with the phenolphthalein, ), The depth and degree of carbonation of the concrete 10 can be measured.

The fastening portion 140 may be a bolt or a screw, which is generally widely used, and a central portion thereof penetrates in the longitudinal direction so that the drill 20 can be inserted. The fastening portion 140 includes a first fastening member 141 and a second fastening member 142.

The first fastening member 141 has a bolt or a screw shape, and a central portion of the first fastening member 141 is formed in a longitudinal direction so that the drill 20 can be inserted. The first fastening member 141 is inserted into the dust suppressing portion 110 and rotatably engaged with the lower portion of the measuring member 131. At this time, the rotational coupling portion of the first fastening member 141 is formed to correspond to the lower portion of the measuring member 131 in a tooth-like manner.

The second fastening member 142 has a bolt or a screw shape like the first fastening member 141 and has a central portion penetratingly formed in the longitudinal direction so that the drill 20 can be inserted. The second fastening member 142 is rotationally coupled with the upper portion of the measuring member 131.

The concrete carbonation test apparatus 100 according to the first embodiment of the present invention is combined as follows.

The protective portion 120 is disposed on both upper surfaces of the dust suppressing portion 110 and the measuring portion 130 is inserted from the upper portion of the dust suppressing portion 111. [ The first fastening member 141 is inserted into the lower portion of the dust suppression unit 110 and is rotationally coupled with the lower portion of the measurement unit 130.

In this state, the second fastening member 142 is rotationally coupled with the upper part of the measuring member 131, so that the coupling of the concrete carbonation testing apparatus 100 according to the first embodiment of the present invention is completed.

2. Concrete Carbonation  The components of the test apparatus Example )

Hereinafter, a concrete carbonation test apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 2B, 4A, and 4B. The components of the second embodiment are the same as those of the first embodiment, Since the insertion fixing portion 160 is further included, common components will be described with reference to the above description, and the additional components will be described in detail.

The concrete carbonation test apparatus 100 'according to the second embodiment of the present invention includes a dust suppression unit 110, a protection unit 120, a measurement unit 130, a coupling unit 140, an elastic unit 150, And includes a fixing portion 160.

More specifically, the present invention is characterized in that a plurality of dust grooves 111 are formed along an inner circumferential surface of a transparent material, and hollow frustules of a truncated cone shape opened upward and downward to insert a drill 20, Shaped measurement member 131 and a measurement member 131 from the lower inner surface of the measurement member 131. The measurement member 131 is provided on the upper surface of the dust suppression unit 110, A measurement hole 133 formed in the longitudinal direction on the outer peripheral surface of the measurement member 131 and a measurement hole 133 formed in the measurement member 131 on the left and right sides of the measurement member 133 A first fastening member 141 inserted into the dust suppressing portion 110 and rotatably coupled with the lower portion of the insertion fixing member 161, (140) including a second fastening member (142) rotatably coupled with an upper portion of the member (131) And, this has phenolphthalein is injected inner circumferential surface of the dust-inhibiting unit 110. The

When drilling the concrete 10, the drill 20 passing through the protective part 120, the measurement part 130, and the fastening part 140 is moved in accordance with the reaction between the concrete dust generated from the concrete 10 and phenolphthalein When the discoloration is determined and the discoloration is caused by the reaction of the concrete dust and the phenolphthalein, the depth of carbonation of the concrete 10 is measured by reading the measuring scale 134 corresponding to the leader 21.

The elastic part 150 is made of an elastic material and is preferably formed in a spiral shape. The elastic part 150 is preferably a widely used spring, and it is particularly preferable to apply a spring of a material according to a required elastic force.

The insertion fixing portion 160 includes an insertion fixing member 161 and an outer protruding member 162.

The insertion fixing member 161 is in the shape of a pipe into which the elastic part 150 is inserted and a screw thread is formed on the lower inner circumferential surface of the insertion fixing member 161 so as to be rotatably engaged with the first coupling member 141. The insertion fixing member 161 is formed to have a larger diameter than the elastic part 150, thereby protecting the elastic part 150 from external impact.

The outer projecting member 162 is formed to extend radially from the upper outer surface of the insertion fixing member 161. The outer projecting member 162 is engaged with the inner projecting member 132 while inserting the fixing member 161 into the measuring member 131.

The concrete carbonation test apparatus 100 'according to the second embodiment of the present invention is combined as follows.

The protective portion 120 is disposed on both upper surfaces of the dust suppressing portion 110 and the measuring portion 130 is inserted from the upper portion of the dust suppressing portion 111. [ The first fastening member 141 is inserted into the lower portion of the dust suppression unit 110 and is rotationally coupled with the lower portion of the measurement unit 130.

The elastic part 150 is inserted into the insertion fixing part 160 and the insertion fixing part 160 in which the elastic part 150 is inserted is inserted into the measurement member 131.

In this state, the second fastening member 142 is rotationally coupled to the upper part of the measuring member 131, thereby completing the connection of the concrete carbonation testing apparatus 100 according to the second embodiment of the present invention.

3. Concrete Carbonation  Test Methods

Hereinafter, a concrete carbonation test method according to an embodiment of the present invention will be described with reference to FIGS.

(A) spraying phenolphthalein on the inner peripheral surface of the dust suppressing portion 110 (S100), (b) applying a lower portion of the dust suppressing portion 110 to the concrete 10, (C) placing the drill 20 with the leader 21 inserted into the dust-suppression unit 110 and placing the drill 20 in contact with the concrete 10 in step S300; and d) The concrete dust generated by the drill 20 rotatably inserted into the concrete 10 is displayed on the left and right sides of the leader 21 and the measurement hole 133 on the measurement member 131 at the time of reacting with phenolphthalein and discoloring (S400) of measuring the carbonation depth of the concrete (10) by reading a numerical value corresponding to a plurality of measurement graduations (134).

In step (a), the phenolphthalein is sprayed on the inner circumferential surface of the dust-suppressing part 110, and in particular, remains in the dust groove 111 formed on the inner circumferential surface of the dust- Here, the dust grooves 111 are formed on a plurality of circumferentially different sizes.

In the step (b), the portion of the concrete 10 to be measured for the depth and degree of carbonation is determined, and then the concrete carbonation test apparatus 100, 100 'is placed in contact with the concrete 10.

In the step (c), the drill 20 is inserted into the dust-suppression unit 110 so that the drill 20 is brought into contact with the concrete 10. At this time, the leader line 21 displayed on the drill 20 is visible in the measurement hole 133.

In step (d), the operator continuously observes whether the concrete dust generated in the course of drilling the concrete 10 by operating the drill 20 reacts with phenolphthalein. Thereafter, when the operator discolors due to the reaction of concrete dust and phenolphthalein in the course of drilling, it is confirmed which portion of the measurement graduation 134 corresponds to the leader line 21 displayed on the drill 20 after stopping the drilling operation . Next, the numerical value of the measurement graduation 134 indicated by the leader 21 is read and recorded. At this time, the numerical value of the measurement graduation 134 corresponds to the carbonation depth of the concrete 10.

In order to increase the oxidation resistance, BHT (2,6-DI-BUTYL-4-METHYLPHENOL), which is a phenolic antioxidant, is added to the dust suppressing portion 110 Can be added. Such BHT increases the ozone resistance and the oxidation resistance and prevents corrosion and oxidation of the dust suppressing portion 110.

When the sum of the synthetic resin material and BHT is 100 parts by weight, BHT is preferably 0.4 to 1.2 parts by weight. This is because if the addition amount of BHT is less than the above-mentioned range, it is difficult to obtain oxidation resistance, and if it exceeds the above-mentioned range, the density and firmness of the tissue are affected.

Since BHT is further added to the dust-suppressing portion 110 of the synthetic resin material, the oxidation resistance of the present invention is greatly improved, thereby maximizing the service life of the product.

In addition, a surface protective coating layer may be formed on the measurement unit 130 as a surface coating material of a metal material to prevent corrosion of the surface from contaminants or the like. The surface protective coating layer is composed of 60 wt% of alumina powder, 30 wt% of NH ₄ Cl, 2.5 wt% of zinc, 2.5 wt% of copper, 2.5 wt% of magnesium and 2.5 wt% of titanium.

The alumina powder is added for the purpose of sintering, entangling, fusion prevention, etc. when heated to a high temperature. When such an alumina powder is added in an amount of less than 60% by weight, the effect of sintering, entangling and fusion prevention is deteriorated. When the alumina powder exceeds 60% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 60 wt% of the alumina powder.

The NH ₄ Cl reacts with steam, aluminum, zinc, copper, and magnesium to activate diffusion and penetration. This NH ₄ Cl is added in an amount of 30% by weight. When NH ₄ Cl is added in an amount of less than 30% by weight, the reaction with aluminum, zinc, copper and magnesium in a vapor state is not properly performed, thereby failing to activate diffusion and penetration. On the other hand, if NH ₄ Cl exceeds 30 wt%, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 30 wt% of NH ₄ Cl.

The zinc is compounded to prevent corrosion of the metal that is in contact with water and to be used for electrical applications. 2.5% by weight of this zinc is mixed. If the mixing ratio of zinc exceeds 2.5% by weight, corrosion of the metal which is in contact with water can not be properly prevented. On the other hand, when the mixing ratio of zinc exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that zinc is mixed at 2.5% by weight.

The copper is combined with the aluminum to increase the hardness and tensile strength of the metal. This copper is mixed at 2.5% by weight. If the mixing ratio of copper is less than 2.5 wt%, the hardness and tensile strength of the metal can not be properly increased when combined with aluminum. On the other hand, when the mixing ratio of copper exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, copper is preferably mixed at 2.5% by weight.

Since the pure metal of magnesium has a low structural strength, it is used in combination with the zinc and the like to improve the hardness, tensile strength and corrosion resistance of the metal. This magnesium is mixed at 2.5% by weight. When the mixing ratio of magnesium is less than 2.5% by weight, the hardness, the tensile strength and the corrosion resistance to the salt water of the metal are not greatly improved when they are combined with zinc and the like. On the other hand, when the mixing ratio of magnesium exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that magnesium is mixed with 2.5% by weight.

The titanium is a lightweight, hard and corrosion resistant transition metal element with a silver-white metallic luster. Because it has excellent corrosion resistance and specific gravity, it weighs only 60% of steel. Therefore, the weight of the coating material applied to the metal base material is reduced, Excellent water resistance and corrosion resistance.

This titanium is mixed at 2.5% by weight. If the mixing ratio of titanium is less than 2.5% by weight, the weight of the coating material applied to the metal base material is not so reduced, and glossiness, water resistance and corrosion resistance are not greatly improved. On the other hand, when the mixing ratio of titanium exceeds 2.5% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, titanium is preferably mixed at 2.5% by weight.

The surface coating method of the measuring unit 130 according to the present invention is as follows.

In order to prevent the oxidation of the measuring unit 130, the measuring unit 130 to which the surface protective coating layer is to be formed and the coating material blended in the above configuration are put in the closed furnace together. Argon gas is injected and maintained at a temperature of 700 ° C to 800 ° C for 4 to 5 hours while the argon gas is injected.

Aluminum powder, alumina powder, zinc, copper, magnesium, and titanium blend are formed by impregnating the surface of the measuring portion 130 with the alumina powder, zinc, copper, magnesium, Thereby forming a coating layer.

After the surface protective coating layer is formed, the inside temperature of the closed space is maintained at a temperature of 800 ° C to 900 ° C for 30 to 40 hours so that a surface protective coating layer for corrosion prevention is formed on the surface of the measuring part 130 Thereby isolating the surface of the measuring unit 130 from the outside air. At this time, the abrupt temperature change in performing the above process may cause a temperature change at a rate of 60 ° C / hr because the surface protective coating layer on the surface of the measuring unit 130 may be peeled off.

The surface protective coating layer of the present invention has the following advantages.

Since the surface protective coating layer of the present invention has a very wide range of applications, it can be applied by various methods such as curtain coating, spray painting, dip coating, flooding and the like.

The surface protective coating layer of the present invention can be coated with a very thin layer thickness in addition to the principle protection against corrosion and / or scale, thereby improving electrical conductivity as well as material and cost reduction. A thin electrically conductive primer may be applied to the top of the surface protective coating layer if high electrical conductivity is desired after the hot forming process.

After the molding process or the hot forming process, the coating material can be retained on the surface of the substrate, for example, to increase scratch resistance, to improve corrosion protection, to meet aesthetic appearance, to prevent discoloration, And may be provided as a primer for conventional downstream processes (e.g., impregnated and electro-mobile dip application).

Since the surface protective coating layer made of alumina powder, NH ₄ Cl, zinc, copper, magnesium and titanium is applied to the measuring unit 130, corrosion of the surface of the measuring unit 130 due to dust, .

The first fastening member 141 and the second fastening member 142 may be coated with a coating composition for preventing corrosion.

The coating composition was prepared by mixing 100 parts by weight of a water-soluble resin composition prepared by mixing 80% by weight of resorcinol diglycidyl ether and 20% by weight of propanol amine with 100 parts by weight of hexamethylated- And 1 to 10% by weight of hexamethylated-hexamethylol melamine.

In the present invention, by utilizing characteristics of the resorcinol diglycidyl ether such as excellent chemical resistance and dimensional stability, properties of corrosion resistance of propanolamine, and excellent lubrication characteristics of melamine derivatives, a more eco-friendly first fastening member 141 And the second fastening member 142 can be formed.

The method for applying the coating composition for corrosion prevention is not particularly limited, but it is preferable to apply the coating composition so that the thickness of the dry film is 10 to 30 占 퐉 on the surface of the aluminum alloy. If the dry film thickness is less than 10 탆, the service life can be shortened, and if it exceeds 30 탆, there is no problem in function but the economic advantage is reduced.

The first fastening member 141 and the second fastening member 142 coated with the coating composition for preventing corrosion are dried at a temperature of 100 to 200 ° C, preferably 150 to 180 ° C, for 10 to 30 minutes, Minute to obtain a coating film which is non-sticky and excellent in gloss.

Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that numerous modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims. And equivalents should also be considered to be within the scope of the present invention.

10: Concrete
20: Drill
21: Leader
100: Concrete carbonation test equipment
110:
111: Dust groove
120:
130:
131: Measurement member
132: inner protruding member
133: Measuring hole
134: Measurement scale
140:
141: first fastening member
142: second fastening member
150: elastic part
160:
161:
162: outer projecting member

Claims (4)

A hollow dust suppressing portion 110 having a truncated cone shape opened up and down so that a plurality of dust grooves 111 are formed along an inner circumferential surface of a transparent material and a drill 20 indicated with a leader line 21 is inserted;
At least one protector (120) in a ring shape disposed on both upper surfaces of the dust suppression portion (110);
An inner protruding member 132 extending from a lower inner side surface of the measuring member 131 toward the central axis of the measuring member 131; an inner protruding member 132 formed on the outer circumferential surface of the measuring member 131; A measurement unit 130 including a measurement hole 133 formed in the longitudinal direction and a plurality of measurement graduations 134 displayed on the left and right of the measurement hole 133 on the measurement member 131;
A first fastening member 141 inserted into the dust suppressing portion 110 and rotatably coupled with the lower portion of the measuring member 131 and a second fastening member 142 rotatably coupled with the upper portion of the measuring member 131. [ And a fastening portion 140,
Characterized in that phenolphthalein is injected into the inner peripheral surface of the dust suppressing portion (110)
Concrete carbonation test equipment. The method according to claim 1,
In the concrete carbonation test apparatus 100,
An elastic part 150 of elasticity; And
The insertion fixing member 161 includes a tubular insertion fixing member 161 into which the elastic portion 150 is inserted and an outer protruding member 162 extending radially from the upper outer surface of the insertion fixing member 161 ); ≪ / RTI >
Concrete carbonation test equipment. 3. The method according to claim 1 or 2,
The drill 20 passing through the protective part 120, the measurement part 130 and the coupling part 140 may be formed by drilling the concrete 10 with the concrete dust generated from the concrete 10 and the phenolphthalein The discoloration is determined according to the reaction of < RTI ID = 0.0 >
And the depth of carbonation of the concrete (10) is measured by reading the measurement scale (134) corresponding to the leader line (21) when the concrete is discolored by the reaction of the dust and the phenolphthalein.
Concrete carbonation test equipment. (a) spraying phenolphthalein on the inner peripheral surface of the dust-suppressing portion 110;
(b) placing the lower portion of the dust suppressing portion 110 in contact with the concrete 10;
(c) inserting the drill (20) marked with the leader (21) into the dust suppression part (110) and placing it in contact with the concrete (10); And
(d) When the concrete dust generated by the drill 20 rotatably inserted into the concrete 10 is discolored by reacting with the phenolphthalein, the guide line 21 and the measurement hole 133, which is the measurement member 131, And measuring the carbonation depth of the concrete (10) by reading a numerical value corresponding to a plurality of displayed measurement graduations (134).
Concrete carbonation test method.

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