无机非金属专业外文翻译低水灰比复合水泥的水化.docx

1、无机非金属专业外文翻译低水灰比复合水泥的水化外文资料翻译The Hydration of Blended Cement at Low W/B RatioABSTRACT： The hydration process,hydration product and hydration heat of blended cement paste mixed with mineral admixture and expansive agent at Low/B ratio are studied ByrdThermos analysis,and calorimetry instrument,and the

2、y were compared with those impure cement paste.The results show that pure cement and blended cement at Low/B ratio have the same types hyperproductions,but respective amounts hyperrational products of various blended cements at same ages Anthea variation Olathe amount of same hydration with ages are

3、 different;The Joint effect liquefaction fodgel-deterring due to water absorption and the expansive pressure on millepore adrift caused Sotheby crystallogenetic is the impetus of the volume expansion cementa pasteand Rothermere effect is much greater than the latter one.KEY WORDS: hydration; blended

4、 cement; low W/B ratio; expansion mechanism1 IntroductionThe hydration and hardening processes of ordinary cement have been studied intensively 1-3.Partly replacing cement with fly ash,slag,or other active mineral admixture can not commodify the cement strength grade,reduce the hydration heat of cem

5、ent,but also meliorate the structure of harden cement paste4.Applying expansive agent in ordinary concrete can combine the bearing and waterproof functions of a building,and it can also reduce the shrinkage and prevent the cracking of concrete5,6.However,the hydration process of cement mixed with fl

6、y ash,slag and expansive agent at Low/B ratio under non-saturation watercondition need to be studied sufficlently.So we execute the research work in this field.2 Elementarily2.1Raw materials(1)Cement:Gra(le 42.5 P O cement produced by Huitain Cement Company in China was used.(2)Fly ash: Ground fly A

7、shdown produced by a thermoelectricity plant.(3)Slag:Ground blast furnace slag was produced by Wu Han Steel Company in China whose specific surface is 6000cm2/g.(4)Expansive agent:(a)UEA expansive agent was manufactured by Zhengzhou Company,The chemical compositions of raw materials are shown in Tab

8、le L(b) Two kinds of expansive grandparental prepared by ourselves;The main components expansive agent ar raw alunite and CaSO4-2H2O and those expansive agent include autunite.clinker and sulphonate cement CaSO4-2H2O.2.2Method221 Preparation of cement paste sample under breeching conditionThe pure c

9、ement paste (or cement paste mixed with mineral admixture and expansive agent) was prepared in 20x20x20mmmoukl.The specimen Demopolis after 24h of standard curing(20C,RH905%),and then cured without molds under the same condition to test ages.2.2.2Measuring the hydration heat of cement pasteA Dardans

10、 bland XMD50000 series intellective instrument and a standard Cu-Thermos resistance temperature sensor were used.The temperature measuring range was -50PCto 150*C.After being mixed evenly,the cement paste.Sample was put into the round vacuum flask,and the temperature sensor was embedded into the cem

11、ent paste,sealing the mouthof the flask with PVC lamina and olefin and continuously measuring the temperature variation of the cement paste at 20eCenvironment temperature until the temperature of cement paste is the wherewithal of environment temperature.3 Results and Discussion3.1Hydration process

12、of blended cementWe used 15% fly ashJ5% flag and 10% UEA to replace correspondency cementand studied the hydration products with XRD.The specimens were all molded and cured under free,Low/B ratio (0.28) and moist conditions (but not soaked into water).From Flg.l to Fig.4 we can learn that the types

13、of the hydration products of pure cement and blended cement are the same.All of them are CSH,CH,Aft etc.In addition,there hemihydrated C3S and CISetc.But in the same hydration age,the amount of all kinds of hydration products differs obvlously.And this fact is reflected in the differences of the rel

14、ative integrity of the diffraction peaks (Counterseal-e).We list the relative intensity of the diffraction peaks of the main hydration products and hydrated C3S and C2S at ages of 3d and 28d age in Table 2.Tablel Characteristics of Raw MaterialsClxin ical nn忡d mmw* wt 凭SS/(ml kg *)HUD/MPaSiO,FeATO.C

15、at)W)SOjCmient21.475.804.W59.643.112. US2.W31957UEA29.507. 762.R217.931.8324.7)20.67s辰34.7615.39L2035.869.073. S)一颇99If 2.ll26.154.686.42.3)1.930.437.8286KBS S:Specific surface;R W D:Ratio of water demand;R28:Compressive strength of 28dTable2 The Relative Intensity of the Diffraction Peaks/Countsfti&Gmert Cemml+ 15 $坷 15殳 Fly A4i l：nert+ lOUEAC?S111AftGSCHAhC?S(HA(kCjSCHAFi7563506J1(850的78416010)&2841123474296474169454080653d10 20 30 4020Fig.l XRD pattern