—This paper describes an experimental study of an
enhancement of pre-formed foamed concrete, 1300-1900 kg/m3,
by utilising two types of additives, silica fume and fly ash, to
partially replace Portland cement and fine sand. It focuses on
consistency, mechanical and thermal properties as well as
presenting a comparison with normal weight, lightweight and
foamed concretes from the literature. In addition to
conventional foamed concrete mixes (FC), foamed concrete
mixes with high flowability and strength (FCa) were also
manufactured in this study. The FC mixes had 28-day
compressive strengths from 6 to 23 MPa and corresponding
thermal conductivities in the dry state from 0.475 to 0.951
W/mK, whereas for the same density range, the FCa mixes
gave 19-47 MPa and 0.498-0.962 W/mK, respectively.
Compared to other studies on foamed concrete, the results
from the mixes investigated in this study showed higher
strengths (for a given density), higher tensile to compressive strength ratios and higher moduli of elasticity.
—Foamed concrete, mineral admixture,
mechanical properties, thermal conductivity.
A. A. Hilal was with the University of Al-Anbar, Iraq and now he is
with the Department of Civil Engineering, Faculty of Engineering, the
University of Nottingham, UK (e-mail:
N. H. Thom and A. R. Dawson are with the Department of Civil
Engineering, Faculty of Engineering, and the University of Nottingham,
UK (e-mail: firstname.lastname@example.org,
Cite: Ameer A. Hilal, Nicholas H. Thom, and Andrew R. Dawson, "The Use of Additives to Enhance Properties of Pre-
Formed Foamed Concrete," International Journal of Engineering and Technology vol. 7, no. 4, pp. 286-293, 2015.