水泥混凝土专业外文翻译5

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1、时光荏苒，岁月如白驹过隙，不经意间，我们即将从多彩的大学毕业，完成一个从大学生到社会人的转变。四年的大学生涯，让我明白了许许多多的科学知识和人生哲理，以及数不尽的感悟和成长。然只有将所学的理论知识付诸于社会的实践，才能检验和实现理论自身的价值，也只有将理论付诸于实践才能使理论得以检验。同样，一个人的价值也是通过实践活动来实现的，也只有通过实践才能锻炼人的品质，彰显人的时代风貌。而毕业实习作为大学的最后一课，也是最后一刻，我倍加珍惜，从而可以较深层次的理解社会，以便为将来能更好的胜任工作打下坚实的基础。附录（一）外文原文4.2.1.1CementTestbySieveNo.17

2、0Thefinenessofcementaffectsthequalityoftheconcreteindustryingeneral.Abigcementparticlecannotcompletelyreactwithwateraswatercannotreacharemainingcoreinthecementparticle.Thewaterpropagatesthroughthecementparticlesandtheystarttodehydrate,whichcausesanincreaseintemperature,whichisthemainreasonf

3、ortheformingofhaircracksandpreventingstabilizationofcementvolume.Asaresult,anincreaseinthecementparticlesizereducesthestrengthofthesamecementcontentandincreasingthefinenessofthecementwillimprovetheworkability,cohesion,anddurabilitywithtimeanddecreasethewatermovingupwardtotheconcretesurface.

4、Figure4.1,fromNeville’sbook(1983),presentstherelationbetweenconcretestrengthandtheconcretefinenessatdifferentages.Toperformthistest,takeasampleof50gofcementandshakeitinaclosedglassbottlefortwominutesandthenrevolvethesamplegentlyusingdrybar.Putthesampleinaclosedbottleandleaveitfortwominutes.

5、Putthesamplein170sieve(90microns)andmoveit,shakingthesievehorizontallyandrotationally,thenconfirmfinishingthesievetestwhentherateofpassingcementparticlesisnotmorethan0.5g/minduringthesieveprocess.Removethefinescarefullyfromthebottomofthesieveusingasmoothbrush.Then,collectandweightheremainin

6、gparticlesonthesieve(W1).Repeatthesametestwithanothersample.Thentheresidualweightforthesecondtestisobtained(W2).CalculatethevaluesoftheremainingsamplesthroughR1=(W1/50)×100R2=(W2/50)×100Theratio(R)iscalculatedbytakingtheaverageofR1andR2tothenearest0.1%and,inthecaseofdeviatingresultsofthetwo

7、samples,morethan1%.Dothetestathirdtimeandtaketheaverageofthethreeresults.Youcanacceptorrefusethecementbasedonthefollowingcondition:ForPortlandcementt•heRmustnotexceedthan10%.•ForrapidhardeningPortlandcementtheRmustnotexceed5%.4.2.1.2InitialandFinalSettin