%0 Journal Article %T Effect of nanosilica on drying shrinkage and creep properties of cement concrete %J Advanced Materials Proceedings %I International Association of Advanced Materials %Z 2002-4428 %A Varghese, Lincy %A Kanta Rao, VVL. %A Parameswaran, Lakshmy %D 2017 %\ 01/01/2017 %V 2 %N 1 %P 56-60 %! Effect of nanosilica on drying shrinkage and creep properties of cement concrete %K Nanosilica %K microsilica %K Microstructure %K drying shrinkage %K creep %R 10.5185/amp.2017/113 %X The microstructure and time dependent properties of nanosilica (nS) added high performance concrete (nS-HPC) were investigated, and a comparison of these properties with those of microsilica (mS) added high performance (mS-HPC) concrete and a reference concrete (RefCon) are presented. 3% colloidal nS and 7.5% powder mS were used to make nS-HPC and mS-HPC, respectively. The scanning electron microscopic image of the 90 days’ nS-HPC revealed that the quantity of Ca(OH)2 present was almost negligible and the concrete attained a finer and compact microstructure with finer C-S-H as compared to that of other two concretes. The creep and drying shrinkage of the nS-HPC were found to be higher than those of RefCon and mS-HPC. However, the observed drying shrinkage of all the concrete mixes was found to be conforming with the estimates made from Indian Road Congress (IRC):112-2011 model, while on the other hand, the creep coefficients of mS-HPC and nS-HPC was found to be higher than the corresponding estimated creep coefficients, and the same were found to be higher by 13.3% and 18.2%, respectively, at 100 days. The increase in drying shrinkage and creep of both the high-performance concretes (HPC) than that of RefCon may be attributed to higher amounts of gel water present in the finer C-S-H produced due to pozzolanic action. The results from the study indicates suitability of nS-HPC for construction of bridge structures. Copyright © 2017 VBRI Press. %U https://amp.iaamonline.org/article_16199_74eda322a6fc9556473c476c54036582.pdf