土木工程专业英语论文doc.docx

土木工程专业英语论文doc.docx

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土木工程专业英语论文doc

Buildingconstructionconcretecrackof

preventionandprocessing

Abstract

The

crackproblemof

concrete

is

awidespread

existence

but

again

difficult

in

solve

of

engineering

actual

problem,

this

textcarriedonastudyanalysistoalittlebitfamiliar

crack

problem

in

the

concrete

engineering,

and

aim

at

concrete

the

circumstance

put

forwardsome

prevention,

processingmeasure.

Keyword:

Concretecrackpreventionprocessing

Foreword

Concrete's

ising

1kind

is

anticipate

bythe

freestone

bone,

cement,

water

andother

mixture

but

formation

of

the

in

addition

material

of

quality

brittleness

not

and

all

material.Becausetheconcreteconstructiontransformwith

oneself,controletc.aseriesproblem,hardenmodelofin

theconcreteexistencenumeroustinyhole,spiritcaveand

tiny

crack,

is

exactly

because

these

beginning

start

blemish

ofexistence

just

maketheconcrete

present

onesomenot

and

allthecharacteristicofquality.Thetinycrackisakind

ofharmless

crack

andaccept

concrete

heavy,

defend

Shenand

alittle

bit

otherusefunction

notacreationtoendanger.But

aftertheconcretebesubjectedtolotuscarry,difference

intemperatureetc.function,tinycrackwouldcontinuously

of

expandwith

connect,

endformation

wecanseewithout

the

aidofinstrumentsofmacro

viewthe

crackbealsothecrack

thattheconcreteoftensayintheengineering.Concrete

buildingandGoupieceusuallyalltakesewertomakeof,

becauseofcrackofexistenceanddevelopmentusuallymake

innerpartofreinforcingbaretc.materialcreationdecay,

lower

reinforced

concrete

material

of

loading

ability,

durable

and

anti-

Shen

ability,

influence

building

of

external

appearance,

service

life,

severity

will

threat

arrive

people's

life

andproperty

safety.A

lot

of

all

ofcrash

of

engineerings

is

becauseof

the

unsteady

development

of

the

crackwiththeresultthat.Modernagescienceresearchwith

a

greatdeal

of

of

the

concrete

engineering

practice

certificate,intheconcreteengineeringcrackproblemis

ineluctable,alsoacceptableincertainlyofthescopejust

needto

adopt

valid

ofmeasurewill

it

endanger

degree

control

atcertainofscopeinside.Thereinforcedconcretenormis

also

explicit

provision:

Some

structure

at

place

of

dissimilarityundertheconditionallowexistencecertain

thecrackofwidth.Butatunderconstructionshouldasfar

aspossibleadoptavalidmeasurecontrolcrackcreation,

makethestructuredon'tappearcrackpossiblyorasfaras

possibledecreasecrackofamountandwidth,particularly

wantto

asfaraspossible

avoid

harmful

crackofemergence,

insureengineeringqualitythus.

Concrete

crackcreationofthereason

bea

lotofandhave

alreadytransformedtocauseofcrack:

Suchastemperature

variety,constringency,inflation,

the

asymmetry

sink

to

sink

etc.reason

causeofcrack;Have

outside

carry

thecrack

that

the

function

cause;Protected

environment

not

appropriatethecracketc.causedwithchemicaleffect.Want

differentiation

to

treat

in

the

actual

engineering,

work°outaproblemacco

rdingtotheactualcircumstance.

In

the

concrete

engineering

thefamiliar

crack

and

the

prevention

1.StemSuocrackandprevention

StemtheSuocrackmuchappearaftertheconcreteprotectbeoverofaperiodoftimeorconcretesprinkletobuildto

completebehindofaroundaweek.InthecementsyruphumidityofevaporatewouldcreationstemSuo,andthiskindof

constringencyiscan'tnegative.StemSuocrackofthe

creation

be

main

is

because

ofconcrete

inside

outside

humidity

evaporate

degree

dissimilarity

but

causeto

transform

dissimilarity

of

result:

The

concrete

is

subjected

toexteriorconditionofinfluence,surfacehumidityloss

leadquick,transformbigger,innerpartdegreeofhumidity

varietysmallertransformsmaller,biggersurfacestemthe

Suotransform

to

besubjectedto

concrete

innerpart

control,

creationmorebigpullshoulddintbutcreationcrack.The

relative

humidity

is

morelow,

cementsyrupbodystemSuomore

big,stemtheSuocrackbemoreeasycreation.StemtheSuo

crack

is

muchsurface

parallel

lines

formor

the

netshallow

thin

crack,

width

manybetween0.05-0.2

mm,the

flat

surface

part

muchseein

the

big

physical

volume

concreteandfollow

itmoreinthinnerbeamplankshorttodistribute.StemSuo

crack

usually

the

anti-

Shenof

influence

concrete,

causethe

durable

oftherust

eclipse

influence

concrete

of

reinforcing

bar,underthefunctionofthewaterpressuredintwould

creationthewaterpowersplitcrackinfluenceconcreteof

loadingdintetc..ConcretestemtheSuobemainwithwater

ashoftheconcreteratio,thedosageofthecomposition,cementofcement,gathertoanticipateofthedosageofthepropertyanddosage,inadditionetc.relevant.

Mainpreventionmeasure:

Whilebeingtochoosetousethe

constringency

quantity

smaller

cement,

generallow

hot

water

mire

andpowderashfrom

stove

cementin

theadoption,

lower

thedosageofcement.TwoisaconcreteofstemtheSuobe

subjected

towater

ashratio

of

influence

morebig,

waterash

ratiomorebig,stemSuomorebig,sointheconcretematch

theratiothedesignshouldasfaraspossiblecontrolgood

water

ashratio

of

chooseto

use,

theChanaddin

the

meantime

accommodation

of

reduce

water.Three

is

strict

control

concretemixblendwithunderconstructionofmatchratio,

useofconcretewaterquantityabsolutecan'tbiginmatch

ratiodesigngivesettleofusewaterquantity.Fouristhe

earlierperiodwhichstrengthenconcretetoprotect,and

appropriate

extension

protect

of

concrete

time.Winter

constructionwanttobeappropriateextensionconcreteheat

preservation

to

overlay

time,

and

Tu2

Shua

protect

to

protect.Fiveisaconstitutiontheaccommodationisinthe

concretestructureoftheconstringencysew.

2.TheSuconstringencycrackandprevention

Su

constringency

is

theconcrete

is

before

condense,

surface

because

of

lose

water

quicker

but

creation

of

constringency.TheSuconstringencycrackisgeneralatdry

heat

or

strong

wind

the

weather

appear,

crack's

much

presenting

in

the

center

breadth,

both

ends

be

in

the

centerthinandthelengthbedifferent,witheachothernot

coherent

appearance.Shorter

crack

general

long20-30cm,the

longer

crackcanreach

toa2-3

m,breadth

1-5mm.Itcreation

ofmainreasonis:

Theconcreteiseventuallyalmosthaving

nostrengthorstrengthbeforetheNingverysmall,perhaps

concretejusteventuallyNingbutstrengthveryhour,be

subjectedtoheatorcomparestrongwinddintofinfluence,

theconcretesurfacelosewatertoleadquick,resultinin

thecapillary

creation

bigger

negative

press

but

makea

concretephysicalvolumesharplyconstringency,butatthis

time

the

strength

of

concrete

again

can't

resist

its

constringency,

therefore

creation

cracked.The

influence

concreteSuconstringencyopenthemainfactorofcrackto

havewaterashratio,

concrete

of

condense

time,

environment

temperature,windvelocity,relativehumidity...etc..

Mainpreventionmeasure:

OneischoosetousestemtheSuo

valuesmallerhigherHuosoursaltoftheearlierperiod

strength

orcommonthe

Huosour

brine

mire.Two

is

strict

the

controlwaterashratio,theChanaddtoefficientlyreduce

water

to

incrementthe

collapse

of

concrete

fall

adegree

and

witheasy,decreasecementandwaterofdosage.Threeisto

sprinklebeforebuildingconcrete,waterbasicleveland

templateeventosoakthrough.Fourisintimetooverlaythe

perhapsdampgrassmatoftheplasticsthinfilm,hempslice

etc.,keepconcreteeventuallybeforetheNingsurfaceis

moist,perhapsspraytoprotectetc.tocarryonprotectin

theconcretesurface.Fiveisintheheatandstrongwindthe

weathertowanttoestablishtohidesunandblockbreezefacilities,protectintime.

3.CrackandpreventionthatthechemicalreactioncauseAlkalibone'santicipatingthecrackthatreactioncrackandreinforcingbarrusteclipsecauseisthemostfamiliarinthereinforcedconcretestructureofbecauseofchemical

reactionbutcauseofcrack.

The

concrete

blend

a

future

reunion

creation

some

alkalescence

ion,

these

ion

with

someactivity

the

bone

anticipate

creation

chemical

reaction

and

absorb

surroundings

environment

in

of

water

but

the

physical

volume

enlarge,makeconcretecrisploose,inflationopencrack.In

this

kindof

crack

general

emergenceconcrete

structure

usage

period,onceappearverydifficultremediable,soshouldat

under

construction

adopt