【英文版】课件：混凝土中的钢筋检测课件讲解

混凝土中的钢筋检测Testing

of

reinforcement

in

concrete

目录Catalogue一检测概述Detectionoverview仪器设备Instrumentandequipment二现场检测Witnessedinspections三数据处理Dataprocessing四一检测概述Detectionoverview锈蚀破坏Corrosionfailure检测概述Detectionoverview钢筋腐蚀Reinforcementcorrosion钢筋有效面积减少The

effective

area

of

reinforcement

is

reduced钢筋应力集中Reinforcement

stress

concentratin

疏松铁锈层对钢筋与混凝土界面的润滑作用Lubricating

effect

of

loose

rust

layer

on

the

interface

between

reinforcement

and

concrete钢筋横肋锈损Rust

on

the

transverse

ribs

of

the

rebar腐蚀产物体积膨胀Corrosion

product

volume

expansion

保护层开裂、剥落Cracking

and

peeling

of

protective

layer钢筋与混凝土粘结性能退化Degradation

of

bond

between

reinforcement

and

concrete承载力下降安全性降低Bearing

capacity

decreases

and

safety

decreases基本原理Ultimateprinciple检测概述Detection

overview

钢筋锈蚀的危害这么大，我们该如何去检测呢？The

harm

of

steel

corrosion

is

so

great,

how

should

we

detect

it?基本原理Ultimateprinciple检测概述Detection

overview半电池电位法Half

cell

potential

method

利用混凝土中钢筋锈蚀的电化学反应引起的电位变化来测定钢筋锈蚀状态；The

corrosion

state

of

reinforcement

is

determined

by

the

change

of

potential

caused

by

the

electrochemical

reaction

of

reinforcement

corrosion

in

concrete可通过测量铜—硫酸铜参考电极与钢筋—混凝土电极之间电位差确定。It

can

be

determined

by

measuring

the

potential

difference

between

the

copper

-

copper

sulfate

reference

electrode

and

the

steel

-

concrete

electrodeCu/CuSo4half

cellHighly

sensitive

multimeter

Perforatedcork二仪器设备instrument

and

equipment

仪器设备钢筋锈蚀仪Steel

corrosion

instrument主机host

machine连接导线connecting

lead电极（单、双电极）electrode三现场检测field

test现场检测witnessed

inspections测区表面处理Surface

treatment

of

test

area导线连接conductor

jointing按测区编号According

to

the

test

area

number布置测区Layout

survey

area在混凝土结构及构件上可布置若干测区；测区面积不宜大于5m×5m；并按确定的位置进行编号。Concrete

structure

and

components

can

be

arranged

in

a

number

of

measuring

areasThe

measurement

area

should

not

be

larger

thanAnd

according

to

the

location

of

the

number

每个测区应采用行、列布置测点，依据被测结构及构件的尺寸；宜用100mm×100mm~500mm×

500mm划分网格，网格的节点应为电位测点。Each

test

area

shall

be

arranged

in

rows

and

columns

according

to

the

size

of

the

structure

and

components

under

testIt

is

advisable

to

use

100mm×100mm~500mm×500mm

to

divide

the

grid.

The

nodes

of

the

grid

should

be

potential

measuring

points

每个结构或构件的半电池电位法测点数不应少于30个。The

number

of

half

cell

potential

measurement

points

for

each

structure

or

component

shall

not

be

less

than

30

Position

of

reinforcementgauging

point现场检测witnessed

inspections测区表面处理Surface

treatment

of

test

area导线连接conductor

jointing按测区编号According

to

the

test

area

number布置测区Layout

survey

area当测区混凝土有绝缘涂层介质隔离时，应清除绝缘涂层介质。When

the

concrete

in

the

test

area

is

isolated

by

insulating

coating

medium,

the

insulating

layer

medium

should

be

removed混凝土表面应平整、清洁;不平整、清洁的应采用砂轮或钢丝刷打磨，并应将粉尘等杂物清除。The

concrete

surface

should

be

smooth

and

cleanAbrasive

wheel

or

wire

brush

should

be

used

to

polish

the

uneven

and

clean,

and

dust

and

other

debris

should

be

removed

测点处Measuring

point测区混凝土应预先充分浸湿。The

concrete

in

the

test

area

should

be

thoroughly

soaked

in

advance在饮用水中加入2%液态洗涤剂配置成导电溶液;Add

2%

liquid

detergent

to

drinking

water

to

prepare

a

conductive

solution在测区混凝土表面喷洒;Spray

the

concrete

surface

in

the

test

area半电池的电连接垫与混凝土表面测点应有良好的耦合。The

electric

connection

pad

of

the

half

battery

should

have

good

coupling

with

the

measuring

point

on

the

concrete

surface现场检测witnessedinspections测区表面布置Survey

area

surface

layout导线连接按测区编号布置测区layoutsurveyarea导线与钢筋的连接应按下列步骤进行:

采用电磁感应法钢筋探测仪检测钢筋的分布情况，并应在适当位置剔凿出钢筋；导线一端应接于电压仪的负输入端，另一端应接于混凝土中钢筋上；连接处的钢筋表面应除锈或清除污物、以保证导线与钢筋有效连接；测区内的钢筋必须与连接点的钢筋形成电通路The

electromagnetic

induction

steel

bar

detector

is

used

to

detect

the

distribution

of

steel

bars,

and

the

steel

bars

should

be

chiseled

out

at

the

appropriate

positionOne

end

of

the

wire

should

be

connected

to

the

negative

input

end

of

the

voltage

meter,

and

the

other

end

should

be

connected

to

the

steel

bar

in

the

concreteRust

or

dirt

should

be

removed

from

the

surface

of

the

steel

bar

at

the

connection

point

to

ensure

the

effective

connection

between

the

wire

and

the

steel

barThe

reinforcement

in

the

measuring

area

must

form

an

electrical

path

with

the

reinforcement

at

the

connection

point

测区表面处理Surface

treatment

of

test

area导线连接conductor

jointing按测区编号According

to

the

test

area

number布置测区layoutsurveyarea导线与铜硫酸铜半电池的连接应按下列步骤进行:The

connection

between

the

wire

and

the

copper

sulfuric

acid

half

battery

shall

be

carried

out

in

the

following

steps

连接前应检查各种接口，接口接触应良好；Check

all

interfaces

before

connection.

The

interfaces

should

be

in

good

contact导线一端应连接到铜—硫酸铜半电池接线插座上，另一端应连接到电压仪的正输入端。One

end

of

the

wire

should

be

connected

to

the

copper

-

copper

sulfate

half

battery

wiring

socket,

and

the

other

end

should

be

connected

to

the

positive

input

end

of

the

voltage

meter现场检测Witnessedinspections现场检测witnessedinspections测区表面处理Surface

treatment

of

test

area导线连接conductor

jointing按测区编号According

to

the

test

area

number布置测区layoutsurveyarea将铜—硫酸铜半电池依次放在各电位测点The

copper

-

copper

sulfate

half

cells

were

placed

at

each

potential

measuring

point

in

turn检测并记录各测点的电位值The

potential

values

of

each

measuring

point

were

detected

and

recorded测量并记录环境温度Measure

and

record

ambient

temperature四数据处理data

processing数据处理data

processing当检测环境温度在(22±5)℃之外时，应按下列公式对测点的电位值进行温度修正:

When

the

ambient

temperature

is

outside

(22±5)℃

,

the

following

formula

should

be

used

to

correct

the

potential

value

of

the

measuring

pointV——温度修正后电位值(mV)，精确至1mV;Potential

value

after

temperature

correction

(mV),

accurate

to

1mVVR

——温度修正前电位值(mV)，精确至1mV;Potential

value

before

temperature

correction

(mV),

accurate

to

1mVT

——检测环境温度℃，精确至1C;Detect

ambient

temperature℃,

accurate

to

1Ck

——系数(mV/℃)。coeffcient(mV/℃)。

式中:结果表示result

representation

数据处理data

processing数据矩阵data

matrix等值线图contour

map（units）（gaugingpoint）结果评定数据处理半电池电位值评价钢筋锈蚀性状的判据A

criterion

for

evaluating

corrosion

behavior

of

steel

bar

by

potential

value

of

half

cell

电位水平(mV)（standard）钢筋锈蚀性状Corrosion

beha