A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effects of Nanosilica Addition on Increased Thermal Stability of Cement-Based Composite
Recently, nanosilica has been widely suggested as an excellent supplementary cementitious material due to its superior reactivity in comparison to other types of siliceous materials. Nanosilica is reported to increase the residual compressive strength of mortar after exposure to high temperatures. The addition of nanosilica has also been reported to cause fundamental changes in hydration products, increasing the average chain length of calcium silicate hydrate (C-S-H) and volume fraction of high-density C-S-H in cement paste in addition to decreasing calcium hydroxide content. The experimental results show that replacing 5% cement by weight with nanosilica leads to a 7 to 20% higher residual compressive strength after exposure to elevated temperatures. Furthermore, maintained exposure at above ambient temperature for long periods of time after exposure to high temperatures caused severe damage only to paste samples that did not contain nanosilica. This damage was not seen in samples containing nanosilica.
Effects of Nanosilica Addition on Increased Thermal Stability of Cement-Based Composite
Recently, nanosilica has been widely suggested as an excellent supplementary cementitious material due to its superior reactivity in comparison to other types of siliceous materials. Nanosilica is reported to increase the residual compressive strength of mortar after exposure to high temperatures. The addition of nanosilica has also been reported to cause fundamental changes in hydration products, increasing the average chain length of calcium silicate hydrate (C-S-H) and volume fraction of high-density C-S-H in cement paste in addition to decreasing calcium hydroxide content. The experimental results show that replacing 5% cement by weight with nanosilica leads to a 7 to 20% higher residual compressive strength after exposure to elevated temperatures. Furthermore, maintained exposure at above ambient temperature for long periods of time after exposure to high temperatures caused severe damage only to paste samples that did not contain nanosilica. This damage was not seen in samples containing nanosilica.
Effects of Nanosilica Addition on Increased Thermal Stability of Cement-Based Composite
Seungmin Lim (author) / Paramita Mondal
ACI materials journal ; 112
2014
Article (Journal)
English
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