ドリル削孔粉を用いた硬化コンクリートの塩化物イオン浸透深さ簡易測定方法－硝酸銀溶液の変色境界と塩化物イオン量の関係－

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20 Article

*1 *2 *3 *1 *2 *3

Simple Test for Measurement of Chloride Ion Penetration Depth

of Hardened Concrete with Drilling Powder

Relation between Discolored Boundary of AgNO

3

Solution and Content of Chloride Ion

Saki HIKE

*1

, Takehiro SAWAMOTO

*2

and Koji KAWAMATA

*3

*1

_{Undergraduate,}

_{Dept. of Building Technologists, Institute of Technologists}

*2

_{Dept. of Building Technologists, Institute of Technologists}

*3

_{Chuken Consultant Co.,Ltd}

Abstract We have been developed the simple test to measure chloride ion penetration depth of concrete by using drilling powder and AgNO3 solution. When the drilling powder each depth of concrete was combined with

the AgNO3 solution, it discolored three varieties of color, and they were light gray, light brown and dark

brown. In other words, two discolored boundary appeared. One was discoloration from light gray to light brown (discolored boundary ). The other was discoloration from light brown to dark brown (discolored boundary ). In this study, content of chloride ion at the boundaries were investigated. As a result, total chloride ion at the boundaries tended to become little so that consistency of AgNO3 solution became thin.

When the consistency of AgNO3 solution was 0.05mol/l, the total chloride ion at the discolored boundary

showed about 6kg/m3, and the discolored boundary showed about 2kg/m3. When the consistency of AgNO3 solution was 0.025mol/l, the total chloride ion at the discolored boundary showed about 3/m3, and

the discolored boundary showed about 1kg/m3_.

Key Words : Concrete, Drilling powder, AgNO

3

solution, Content of chloride ion, Penetration depth

JIS A 1154

JCI-SC4 JCI-SC5

1,2)

_{JIS A 1152}

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21 The Bulletin of Institute of Technologists, No. 7

3,4,5)

60% 30%

20mm

24 60

58.5% 31%

24

40 20mm

60 20mm

1

2

4 NaCl

10%

1

2 20mm

10mm

20mm

10mm 20mm

70mm

1 5g

5g

1

3)

Table 1 Mix proportions and test results (Laboratory mixing)

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22

1

4)

AgCl

Ag O

1,2)

2

5) 1)

0.1mol/l 0.05mol/l

0.025mol/l

3 C

3 JIS

6)

Fig.1 Simple test for measurement of chloride ion penetration depth of hardened concrete

Fig.2 Discoloration of AgNO3 solution5)

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23 The Bulletin of Institute of Technologists, No. 7

0 3 6 9 12 15 0 20 40 60 80

Distance from concrete surface mm

0.1mol l Laboratory Right gray Right brown Dark brown 0 3 6 9 12 15 0 20 40 60 80

0.1mol l Factory Right gray Right brown Dark brown 0 3 6 9 12 15 0 20 40 60 80

0.05mol l Factory Right gray Right brown Dark brown 0 3 6 9 12 15 0 20 40 60 80

0.025mol l Factory

Right gray Right brown Dark brown

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24

4)

NDIS 3419

0.1mol/l

4 6kg/m

3

3 9kg/m

3

0.05mol/l

4 0.1mol/l

6kg/m

3

6 2kg/m

3

_2kg/m

3

0.025mol/l

4 0.025mol/l

3kg/m

3

3 1kg/m

3

1kg/m

3

2kg/m

3 7)

0.025mol/l

(1) (3)

(1)

(2)

0.05mol/l

6kg/m

3

6 2kg/m

3

2kg/m

3

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0.025mol/l

3kg/m

3

3 1kg/m

3

1kg/m

3

1) Nobuaki Otsuki, Shigeyoshi Nagataki, Kenji Nakashita: Evaluation of AgNO3 Solution Spray Method for

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