TY - GEN
T1 - The pore structure and autogenous shrinkage of high-performance concrete with ternary binders
AU - Akkaya, Y.
AU - Konsta-Gdoutos, M.
AU - Shah, S. P.
N1 - Publisher Copyright:
© 2004 American Concrete Institute. All rights reserved.
PY - 2004/5/1
Y1 - 2004/5/1
N2 - Most modem high performance concretes contain supplementary cementitious materials such as silica fume, slag or fly ash. However, highly reactive silica fume adversely affects the autogenous shrinkage properties and increases the risk of cracking at early ages. In order to compensate for the adverse effects of silica fume, ultrafine fly ash was also incorporated into the binder phase of the concrete. Part of cement and part of silica fume were replaced by ultrafine fly ash and early age properties of the mixtures with these ternary binders were compared. Strength gain was followed by compression testing and, autogenous shrinkage properties were measured under free conditions. It is seen that ternary binders can decrease the autogenous shrinkage strains, while keeping the early strength gain at a comparable level. Results of the thermogravimetric analysis showed that mixtures with ternary binders had a similar hydration rate compared to the mixture with silica fume only. Mercury intrusion porosimetry proved that the amount of finer pore volume, one of the major reasons of autogenous shrinkage, was decreased with the incorporation of ultrafine fly ash.
AB - Most modem high performance concretes contain supplementary cementitious materials such as silica fume, slag or fly ash. However, highly reactive silica fume adversely affects the autogenous shrinkage properties and increases the risk of cracking at early ages. In order to compensate for the adverse effects of silica fume, ultrafine fly ash was also incorporated into the binder phase of the concrete. Part of cement and part of silica fume were replaced by ultrafine fly ash and early age properties of the mixtures with these ternary binders were compared. Strength gain was followed by compression testing and, autogenous shrinkage properties were measured under free conditions. It is seen that ternary binders can decrease the autogenous shrinkage strains, while keeping the early strength gain at a comparable level. Results of the thermogravimetric analysis showed that mixtures with ternary binders had a similar hydration rate compared to the mixture with silica fume only. Mercury intrusion porosimetry proved that the amount of finer pore volume, one of the major reasons of autogenous shrinkage, was decreased with the incorporation of ultrafine fly ash.
KW - Autogenous shrinkage
KW - Critical pore radius
KW - Early age concrete
KW - Pore structure
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M3 - Conference contribution
AN - SCOPUS:33845612791
T3 - American Concrete Institute, ACI Special Publication
SP - 233
EP - 248
BT - 8th CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete
A2 - Malhotra, V.Mohan
PB - American Concrete Institute
T2 - 2004 8th CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete
Y2 - 23 May 2004 through 29 May 2004
ER -