Mechanism of ASR reduction by reactive aggregate powders
作者： M. Cyr , A. Carles-Gibergues , M. Moisson , E. Ringot
关键词: Lime 、 Cement 、 Pozzolanic activity 、 Composite material 、 Alkalinity 、 Chemistry 、 Alkali–aggregate reaction 、 Reaction mechanism 、 Pozzolan 、 Aggregate (composite)
摘要: This study aimed to evaluate the effectiveness of a mechanism responsible for mitigation expansion when reactive aggregate powders (RAP) were used in concrete containing same aggregate. In first part, it was shown that RAP efficient reducing by 35 95%. The most those coming from aggregates having high active silica contents (glass, opal). Powders siliceous limestone less effective. second experimental evidence pozzolanic activity obtained. It similar pozzolan, since they consumed lime and produce calcium–silicate–hydrate (C–S–H) lower calcium/silica (C/S) ratio than normal C–S–H. third part showed experimentally these low C/S C–S–H could increase redistribution alkalis pore solution, thus alkalinity solution level sufficiently limit attack coarser aggregates. f...
sci-hub.se 参考文章(32)
Sung-Yoon Hong, F.P Glasser, Alkali sorption by C-S-H and C-A-S-H gels: Part II. Role of alumina Cement and Concrete Research. ,vol. 32, pp. 1101- 1111 ,(2002) , 10.1016/S0008-8846(02)00753-6
TE. Stanton, Studies of Use of Pozzolans for Counteracting Excessive Concrete Expansion Resulting from Reaction Between Aggregates and The Alkalies in Cement ASTM International. ,(1950) , 10.1520/STP39409S
MSY Bhatty, Mechanism of Pozzolanic Reactions and Control of Alkali-Aggregate Expansion Cement Concrete and Aggregates. ,vol. 7, pp. 69- 77 ,(1985) , 10.1520/CCA10372J
Dale P. Bentz, Jeffrey W. Bullard, Edward J. Garboczi, VIRTUAL TESTING OF CEMENT AND CONCRETE: USA 2004 Concrete international. ,vol. 26, pp. 33- 37 ,(2004)
D.P. Bentz, J.T. Conway, Computer modeling of the replacement of “coarse” cement particles by inert fillers in low w/c ratio concretes: Hydration and strength Cement and Concrete Research. ,vol. 31, pp. 503- 506 ,(2001) , 10.1016/S0008-8846(01)00456-2
Dale P Bentz, CEMHYD3D:: a three-dimensional cement hydration and microstructure development modelling package National Institute of Standards and Technology. ,(1997) , 10.6028/NIST.IR.5977
B Mather, L Pepper, EFFECTIVENESS OF MINERAL ADMIXTURES IN PREVENTING EXCESSIVE EXPANSION OF CONCRETE DUE TO ALKALI-AGGREGATE REACTION American Soc Testing & Materials Proc. ,(1959)
J. Duchesne, M.A. Bérubé, Evaluation of the validity of the pore solution expression method from hardened cement pastes and mortars Cement and Concrete Research. ,vol. 24, pp. 456- 462 ,(1994) , 10.1016/0008-8846(94)90132-5
Roland F. Bleszynski, Michael D.A. Thomas, Microstructural Studies of Alkali-Silica Reaction in Fly Ash Concrete Immersed in Alkaline Solutions Advanced Cement Based Materials. ,vol. 7, pp. 66- 78 ,(1998) , 10.1016/S1065-7355(97)00030-8
J. Duchesne, M.A. Bérubé, The effectiveness of supplementary cementing materials in suppressing expansion due to ASR: Another look at the reaction mechanisms part 2: Pore solution chemistry Cement and Concrete Research. ,vol. 24, pp. 221- 230 ,(1994) , 10.1016/0008-8846(94)90047-7