Analysis of foamed concrete pore structure of railway roadbed based on X-ray computed tomography

摘要

The uneven settlement of weak roadbed will lead to road subsidence, which will reduce driving comfort and even cause traffic accidents. In the treatment of weak road base, foamed concrete has become an excellent subgrade replacement material because of its light weight and high strength. In order to study the pore structure characteristics of foamed concrete used in the railway roadbed replacement project, three kinds of foamed concrete with different density made in construction site were analyzed based on X-ray computed tomography (X-CT) technology. The results showed that the porosity of the three kinds of foamed concrete was different, the pore size distribution was also different, and the sphericity of pores was closely related to the pore size. Finally, the basic mechanical properties of foamed concrete were analyzed from the point of view of pore parameters. (C) 2020 Elsevier Ltd. All rights reserved.