Abstract
Foam concrete (FC) is utilizable in various fields of application in civil engineering practice. It's most often used as a leveling sub-base in the floors of the buildings or foundation structures or as a fill material in open spaces such as unused underground structures. Foam concrete contains void pores so it has much lower bulk density than regular concrete. Together with the saving of material inputs, physical and mechanical parameters and low thermal conductivity, it predestinates its use as a structural element of the structures such as sub-base layers. Strain modulus from the second load cycle is the common control parameter in the sub-base design. Some elements of conventional PLT equipment are not usable for foam concrete testing because of larger deflection radius due to the larger stiffness of foam concrete. When reliable relation between dynamic modulus and conventional strain modulus is determined, LWD testing can substitute the PLT test as a quick and simple method. This paper is the first approach to estimate this relation.
Highlights
Foam concrete (FC) is prepared from cement, water, additives and technical foam
Progress of foam concrete formula led to reduction of bulk density, but mechanical parameters remain at the same level
A large number of different approaches can be adopted to determine the stiffness of the foam concrete layer
Summary
Foam concrete (FC) is prepared from cement, water, additives and technical foam. It has promising mechanical and thermal parameters, and fully mechanized treatment [1,2,3,4,5]. Progress of foam concrete formula led to reduction of bulk density, but mechanical parameters remain at the same level. We can prepare the foam concrete of bulk densities from 300 to 900 kg·m-3. Our recent research is aimed at the design of pavements, industrial floors and foundation sub-bases with the foam concrete. Foam concrete can be used in earth structures, where soft soils are present thanks to low bulk density [12]. We try to shift the foam concrete to the structure designs as a replacement for current materials
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