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Behavior of concrete using alccofine and nano-silica under elevated temperature

Journal: International Journal of Advanced Technology and Engineering Exploration (IJATEE) (Vol.8, No. 78)

Publication Date:

Authors : ; ;

Page : 600-618

Keywords : Concrete; Alccofine (Al); Nano-silica (Ns); Compressive strength; Spalling and Color change.;

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Fire protection is a critical concern since it can occur at any time because of naturally occurring or human threats. Concrete is proven to be excellent fire-resistant construction material, but spalling and infinite cracking occur if exposed to fire for a long period. In this paper effect of high temperature on concrete using alccofine (Al) and nano-silica (Ns) is examined for M40, M50, and M60 concrete grade. Residual compressive strength (RCS), % weight loss and spalling & color change of concrete cubes exposed to the fire temperatures of 200ºC, 400ºC, 600ºC, 800ºC & 1000ºC for the period of 4, 8 and 12 hrs are studied. Results have shown that the addition of alccofine (Al) and nano-silica (Ns) to concrete decreased weight and compressive strength. The increase in temperature above 600ºC affected the compressive strength of the Al + Ns mixes more than control mixes. At 1000ºC, excessive micro-cracking is also observed. Increased fire duration substantially increased concrete degradation.

Last modified: 2021-06-03 16:40:32