DOI: 10.5176/2301-394X_ACE15.93
Authors: Sherif Yehia, Kareem Helal, Shahinaz El Kalie, and Sharef Farrag
Abstract:
Supplementary cementitious materials (SCM) became an important ingredient in the preparation of concrete mixtures. SCM could be added individually or in different combinations as a percentage replacement of the cement weight. The commonly used SCM in the construction field are Fly ash (FA), Silica fume (SF), and Ground granulated blast slag (GGBS). SCMs usually contribute to improvement of strength, permeability, workability, and durability. This paper discusses the effect of SCMs on fresh and hardened properties of Lightweight Concrete (LWC). The experimental program included mixes with fly ash, silica fume, and evaluation of their effect on the mechanical properties of LWC. Moreover, an additional mix with GGBS, fly ash, and silica fume was prepared to evaluate the effect of GGBS on the properties of LWC. In the current study percentage of fly ash, silica fume, and GGBS were 15{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}, 10{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465}, and 25{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} respectively. Several concrete mix combinations were prepared and tested for compressive strength, flexural strength, modulus of elasticity, and modulus of rupture. The results showed that compressive strength was higher by about 35{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} when SF was added compared to that of the control mix. However, about 17{6e6090cdd558c53a8bc18225ef4499fead9160abd3419ad4f137e902b483c465} increase was observed for mixes with FA after slow early strength gain. In addition, similar behavior of FA, SF, and GGBS was noticed for split tensile strength and modulus of rupture.
Keywords: Fly ash; lightweight concrete; workability; aggregates; fresh stage; Silica fume; mechanical behavior
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