Buildings, Vol. 15, Pages 1914: Shear Strength and Ultimate Bearing Capacity of Silt-Based Foamed Concrete Under Local Vertical Loading

Buildings doi: 10.3390/buildings15111914

Authors:
Chuanyi Ma
Jun Wang
Ning Zhang
Chuyi Wang
Shengtao Zhang
Yuchen Tao
Shurong Lou
Qingshuo Sun
Xianfu Ren
Hongbo Zhang

With the rapid development of lightweight and environmentally friendly building materials, foamed concrete has been widely adopted as a novel material for lightweight filling and foundation applications. However, its bearing capacity under localized loading conditions requires further investigation. This study focuses on silt-based foamed concrete with a 30% silt content. A series of unconfined compression tests and triaxial shear tests were conducted to determine its key mechanical properties. Large-scale indoor model tests were then carried out to evaluate the effects of the wet density (600 kg/m3, 700 kg/m3, and 800 kg/m3) and the loading position on vertical bearing performance. The results show that silt-based foamed concrete exhibits a basin-shaped deformation pattern under vertical loading, similar to traditional foundations. Based on experimental data and shear strength parameters, a formula for the ultimate bearing capacity of silt-based foamed concrete was developed by extending Terzaghi’s bearing capacity theory. This provides a theoretical basis for its application in geotechnical engineering.

Source link

Chuanyi Ma www.mdpi.com