粉煤灰微珠文獻翻譯4and application study on ultra pozz

1、TheCharacteristicsandApplicationStudyonUltraAbstract: Ultra pozz is a superfine glass bead from the smoke discharged by coal station, whose averageparticlesizeis1.0m.ThesurfaceofUltrapozzisvitreousbody,whichshowsspherical. The mixed water for concrete can be reduced and the fluidity of concrete is i

2、ncreased when Ultra pozz is partly instead of cement and added into concrete. The strength and durability of concrete will be increased by using the Ultra pozz for concrete. And the Ultra pozz is one new component in concrete low carbon technology. The application of Ultra pozz is introduced in the

3、high performance concrete and Ultra-high performance concrete.Key words: Ultra pozz ; High performance concrete; Ultra- high performance concrete; Ultra pozz is a superfine glass bead from the smoke discharged by coal station, concrete performance can be improved greatly mixed with Ultra pozz.When t

4、he high performance concrete (HPC) and Ultra-high performance concrete (UHPC) are mixed with Ultra pozz, the fluidity, strength and durability of concrete can be improved. If Ultra pozzis partly instead of cementand added into concrete, there is no need to add Micro silica fume, C60, C70 and C80 HPC

5、 can be produced but can be still with enough workability and plasticity Performance also.When Ultra pozz and Micro silica fumeare both to instead of cement and added into concrete, even C100 and C120 Ultra-high performance concrete (UHPC) can be produced. In addition, Concrete Piles with Ultra-high

6、 performance can be manufactured within Ultra pozz.RawCement: P.O42.5 or P.O52.5 (Code C); Micro silica fume (Code SF); Superplasticizer (Code AG); Fine aggregate (Medium sand, Code S); Coarse aggregate: gravel or crushed limestone (Code G).UltraPhysicalSphericalparticles,Vitreousbodywithsmoothsurfa

7、ce,theSEMshowninFigureThemagnificationis(b)ThemagnificationisThe average particle size is 1.0m, which is approximately 1/20 of fly ash average diameter (20m), the particle size distribution shown in Figure 2.The apparent density is 0.81g/cm3, and the density is 2.52g/cm3, the ball compressive streng

8、th 800 MPa;ThewateramountofStandardthickdegreeThewateramountofmortardemandratioThewateramountofconcretedemandratioAs shown in Fig1, the Ultra pozz is a superfine glass bead with highcompressive strengthand low water demand ratio, which is benefit for making HPC and UHPC.AsshowninFig2,the particle si

9、ze distributionofUltrapozzmostlyarrange from0.21.0m, and be accounting 42.43% of total superfine bead; these Ultra pozz of particle size distribution 0.2maccounting27.23%,whichisapproximately1/20offlyashaveragediameterChemicalTheChemicalcompositionofULTRAPOZZisshowninTable1TheChemicalcompositionofUL

10、TRAFluidityofCementPasteandMortarStrengthTheEffectofUltrapozzonCementPasteP.O52.5 cement 500g, W/C=0.30, water amount is 150g, Water reducer dosage is 7.5g,Ultra pozz dosage is 17%, 25% , respectively instead of cement. The fluidity of cement is shown in Table2TheeffectofUltrapozzoncementpastedosage

11、of dosageof Note:the *indicatethatthe effect ofUltra pozzoncementpastefluidityafterwateramountbeingAs shown in Table2, the fluidity of cement paste increased with the dosage of Ultra pozz increasing, andwhen 17% of cement is equivalentalternative by Ultra pozz, the fluidity increased from 240 to 260

12、; even the water amount is reduced from 150g to 133g, the fluidity is 236mm which is similar to stand cement fluidity 240mm. Moreover, When 25% of cement is equivalent alternative byULTRAPOZZ ,thefluidityisincreasedto273mm,andthesametime,thefluidity is 245mmwhen wateramountisreduced to 120g, which i

13、s litter bigger than standcementfluidity.TheEffectofUltrapozz on MortarUltra pozz dosage is 17%, 25%, respectively instead of cement. The fluidity of mortar should be keen almost the same after mixing Ultra pozz and water, the mortar design is shown in Table3.Table3TheMortardesignStandard1-276.5(dos

14、ageof 3112.5(dosageofThe3d,7d,and28dStrengthofstandardmortarand Ultrapozzmortarare shownin1-242. 3Table4 The Strength of standard mortar and Ultra pozz mortar Compressive Strength (MPa)Flexuralstrength(MPa)As shown in Table4, all the compressive strengthand flexural strength of Ultra pozz mortar are

15、 greater than the standard mortar,in particularly,the28dcompressive strengthof mortarwith Ultra pozz dosage of 25% is in tiptop.HPCPerformanceTestmixedwithUltraThe HPC concrete design mixed with Ultra pozz is shown in Table5, and the Workability of Fresh HPC is shown in Table6, Table7.Table5TheHPCde

16、signTable6TheWorkabilityofFreshHPCconcretemixedwithUltraEmptying89Table7TheCompressiveStrengthofHPCAs shown in Table5, the workability of Fresh HPC concrete mixed with Ultra pozz mostly dependedonthe superplasticizer,the slumpandfluiditywere notobviouslyreducedinthree hours, at the same time, mixing

17、 with Ultra pozz can help to keep the workability of fresh HPC concrete.As shown in Table7, C70C80 HPC can be produced by mixing with Ultra pozz, Fly ash and UHPCPerformanceTestmixedwithUltraThe ultra-high performance of High workability and long Plasticity can be achieved by mixing both of Ultra po

18、zz and Micro Silica Fume in low W/C ratio and superplasticizer. In this research, the W/C=0.18, 1/3 cement is replaced by both of Ultra pozz and Micro Silica Fume, and the workability is shown in Table8 and Table9.Table8TheWorkabilityofFreshUHPCconcretemixedwithUltraEmptying4456Table9TheCompressiveS

19、trengthofUHPCFrom the Table9, we can find that the 28d Compressive Strength of UHPC mixed with Ultra pozz and Micro Silica Fume was 132.7MPa, which exceeded C120 Strength Level.6TheEffectofUltrapozzonconcrete6.1 The diffusion depth of Cl- in mortar mixed with Ultra pozz in different Ultra pozz dosag

20、e is 0, 10%, 20%, respectively instead of cement, and the mortar specimens were soaked in saturated brine, and to test the diffusion depth of Cl- in mortar specimens at different cured period, and the test result is shown in Table10.Table10TheDiffusiondepthofCl-inMortarmixedwithUltraStandardDosageof

21、10%ULTRA7Dosageof20%ULTRA69AsshowninTable10,whencementwasrespectivelyinsteadbyUltra pozzasthe dosage is10% and 20%, the diffusion depth of Cl- in mortar specimens is only 1/2 of standard mortar specimen.6.1ResistancetosulfateattackmixedwithULTRAThe resistance to sulfate attack mixed with flyash canb

22、e evaluated by the formula R=(C-5)/F, (in this formula, CCaO percentage content, FFe2O3 percentage content), if some fly ashs R1, it means that the concrete mixed with this kind of fly ash have a good resistance to sulfate attack. Ultra pozz is one kind of super fine powder of fly ash, and in this r

23、esearch, the CCaO percentage content is 4.8%, FFe2O3 percentage content is 5.3%, if put C and F into the above equation, we can calculate that R is negative, so the Ultra pozz is of high sulfate resistance. Some research proved that, if the HPC concrete specimens which mixed Ultra pozz were immersed

24、 in the solution of 5% Na2SO4, and the solution of 5% Na2SO4+3%NaCl, respectively, getting out after 14h and natural dry 2 hours, after then, drying in (802) for 6 hours, finally cooling specimens for 2h, after 50 times cycle like this, all the HPC specimens mixed with Ultra pozz have no significant change in appearance and weight.7 Ultra pozz is an ultrafine particles of glass beads, and the average particle