粉煤灰品质与抑制ASR膨胀的能力(5)

3.3 粉煤灰对ASR 膨胀的抑制是粉煤灰综合效应的体现,不同粉煤灰抑制ASR 膨胀能力的差异不能简单归结为某一特定品质指标的不同,特别是品质指标绝对值及其差别不大时。参考文献:

[1] Hobbs D W.Effect of mineral and c hemical admi xtures on AAR[A].

O KADA eds.The 8th Internati onal Conference on AAR in Concrete [C].Japan:Society of Mterials Science of Japan,1989,173.[2] Hobbs D W.The effectiveness of PFA in reducing the ris k of c racking

due to ASR in concre te contai ning c ristobalite[J ].Magazine of Con crete Res earch.1994,46(168):167 175.

[3] Thomas M D A,Blackwell B Q,Ni xon P J.Estimati ng thealkali contri

bution from fly ash to expansion due to alkali aggregate reacti on in con crete[J].Magaz ine of Concrete Research.1996,48(177):251 264.[4] THO MAS M D A,BLACKWELL B Q.Summary of BRE research on

the effect of fly ash on alkali silica reac ti on in concrete[A],SHAYAN A eds.Proceedings of the 10th Internati onal conference on Alkali Ag gregate Reacti on in Concrete[C].Aus tralia:CSIRO Di visi on of Build ing Cons tructi on and Engineering,1996.554 561.

[5] Farbiarz J,Carras quillo R L,Snow P G.Al kali aggregate reaction i n fl y

ash concrete[A].O KADA eds.The 8th Internati onal Conference on A AR in Concrete[C].Japan:Society of Materi als Science of Japan,1989.241 246.

[6] Perry C,Day R L,Joshi R C,et al.The effectiveness of twelve Cana

dian fly ashes in s uppres sing expansi on due to ASR[A].GR ANTAN BELLEW P E eds.Proc.7th International Conference on AAR i n Con crete[C].Canada.1986.93 97.

[7] Duches ne J,Berube M A.Effec tiveness of s upplementary cementi ng

materi als in s uppress ing expansi on due to ASR:another look at the re ac tion mechanisms[J].Cement and Conc rete Research,1994,24:73 82.

[8] Carrasquillo R L,Snow P G.Effect of fly as h on al kali aggregate reac

tion in concrete[J].ACI Materials J ournal,1987,84(4):299 305.[9] Swamy R N,Al Asali M M.Effectivenes s of mineral admixtures i n con

trolling ASR expans ion [A].OK ADA eds.The 8th International Con ference on AAR in Concrete[C].Japan:Society of Materials Science of Japan,1989.205 210.

[10]Dunstan E R Jr.The effect of fly ash on concrete alkali aggregate reac

tion[J].Cement,Concrete and A ggre gate,1981,3(2):101 104.[11]Berra M,Mangialardi J,Paolini A E,et al.Effect of fly as h on alkali

silica reacti on[A].SHAYAN A eds.Proceedings of the 10th Interna tional Conference on Alkali Aggregate Reaction i n Concrete[C].Aus tralia:CSIR O Divi sion of Building Constructi on and Engineering,1996.61 70.

[12]M i ts unon Kawa mura,Kunio Takemoto.Correlation between pore s olu

tion composition and alkali silica expans ion in mortars containing vari ous fly ashes and blastfurnace slags [J].The Int.J ournal of Cement Composites and Lightweight Concrete,1988,10(4):215 223.[13]Canham I,Page C L,Ni xon P J.Aspec ts of pore solution chemis try of

blended cements related to the control of alkali silica reaction[J].Ce ment and Conc rete Research,1987,17:839 844.

[14]Hobbs D W.Influence of PFA and granulated blas tfurnace slag upon

e xpansion caused by alkali silica reacti on [J].Magazi ne o

f Concrete Research,1982,34(119):83 94.

Effect of the characteristics of fly ash on the ability to suppress AS R expansion

LU Du you,LI U Heng,LU Yi nong,XU Zhong zi

(College of Materials Science and Engineering,Nanjing Universi ty of Technology,Nanjing 210009,China)

Abstract:The suppressing effect on ASR expansion and the characteristics of four kinds of fly ashes,including chemical constituents,mineral constituents,particle morphology and size distribution,were studied.The relationship between the charac teristics of fly ashes and their ability against ASR e xpansion was discussed.Results showed that class F fly ash is superior to class C fly ash in suppressing ASR expansion.The same characteristic of different types of fly ashes may have different influences on the ability to suppress ASR expansion,and the difference in the ability to c ontrol ASR expansion of various types fly ashes can not be attributed to the difference of one certain characteristic,especially when the absolute content and the differences are not large enough.

Key words:alkali silica reaction (ASR);expansion;fly ash;particle size distribution;CaO;alkali content

11

第3期卢都友等:粉煤灰品质与抑制ASR 膨胀的能力