Effect Analysis of Soil Type and Silt Content on Silt-Based Foamed Concrete with Different Density

Abstract

This paper investigates the influence of silt content and coarse particle content on the mechanical and physical properties of foamed concrete, including compressive and flexural strength, modulus of elasticity, water absorption, drying shrinkage, and air-void structure. Four types of silt with different coarse particle contents were obtained by soil mixing. The results showed that high density, low silt content, and high coarse particle content can provide better mechanical properties. High silt content and high coarse particle content would lead to lower drying shrinkage. Silt content was the main factor affecting the pore distribution of foamed concrete, and higher coarse particle content could optimize the air-void structure. Meanwhile, the change in air-void structure can accordingly affect the water absorption of foamed concrete. Results showed that, at the same density and silt content, higher coarse particle content can optimize the physical and mechanical properties of foamed concrete.

A Feasibility Study of Low Cement Content Foamed Concrete Using High Volume of Waste Lime Mud and Fly Ash for Road Embankment

“…Although the tensile strength (flexural strength and splitting strength) of foamed concrete is much lower than that of ordinary concrete, this does not apply to the ratio of tensile/compressive strength [ 7 ]. The ratio of flexural/compressive strength of the foamed concrete was between 0.15 and 0.23, and the ratio of splitting/compressive strength was between 0.16 and 0.21.…”

“…Foamed concrete is a typical lightweight material cellularized by the entrainment of fine air bubbles in the matrix, where the maximum air content can be higher than 80% [ 3 ]. It can be designed with a density within the range of 300–1650 kg/m 3 to have the advantages of self-compacting, lightweight, adjustable compressive strength, and convenient preparation [ 4 , 5 , 6 , 7 ]. Accordingly, foamed concrete has been widely used as a new embankment filler to reduce the post-construction settlement and to speed up construction progress [ 8 , 9 ].…”

Study on Tensile and Compressive Properties of Foamed Lightweight Loess

“…Xue [4] used numerical integration method to derive the analytical solution of the vertical additional stress of the foundation under the load of the foamed lightweight soil embankment, and combined with the layered summation method, proposed the theoretical calculation model of the foundation settlement under the surcharge of the light soil embankment, in order to explore the foundation settlement deformation law of the foamed lightweight soil embankment. Although some achievements have been made [5][6][7][8], a small amount of research cannot meet the demand for foamed lightweight soil in engineering. Meanwhile, the strength of foamed lightweight soil obtained by many scholars is relatively low, so it is necessary to optimize the mix ratio to improve the strength of materials.…”