Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mechanical degradation of unstabilized rammed earth (URE) wall under salts and rising damp attack effect
https://orcid.org/http://orcid.org/0000-0001-7262-7660
The long-term chemo–thermo–hydro–mechanical behavior, the salt migration, and the salt attack on unstabilized rammed earth have been rarely investigated in the literature. The authors simulated the mechanical degradation of a typical unstabilized rammed earth (URE) wall under salts and rising damp attack effect by using the finite element method. The simulation results show that the water/salinity in a freshly built rammed earth wall decreases/increases significantly due to the water evaporation and capillary effects after construction, and these effects are stabilized in the following 3 years. Globally, the wall is wetter, cooler, and saltier in winter than in summer and has a lower strength. The strength in the upper part of the wall is higher than in the lower part. In the first 4 years after construction, the strength in the upper part increases and then reaches an equilibrium stage with time, while the strength in the lower part increases and then has the tendency to decrease in the latter 3 years due to the accumulation of salt. The strength inconsistency may exist in the wall due to the combined effects of salt accumulation and water evaporation, and the strength on the surface may be higher or lower than that of the inside due to the changes of surrounding conditions with time. The simulation results show that the wall has the best mechanical performance without damp and salt attacks.
Mechanical degradation of unstabilized rammed earth (URE) wall under salts and rising damp attack effect
https://orcid.org/http://orcid.org/0000-0001-7262-7660
The long-term chemo–thermo–hydro–mechanical behavior, the salt migration, and the salt attack on unstabilized rammed earth have been rarely investigated in the literature. The authors simulated the mechanical degradation of a typical unstabilized rammed earth (URE) wall under salts and rising damp attack effect by using the finite element method. The simulation results show that the water/salinity in a freshly built rammed earth wall decreases/increases significantly due to the water evaporation and capillary effects after construction, and these effects are stabilized in the following 3 years. Globally, the wall is wetter, cooler, and saltier in winter than in summer and has a lower strength. The strength in the upper part of the wall is higher than in the lower part. In the first 4 years after construction, the strength in the upper part increases and then reaches an equilibrium stage with time, while the strength in the lower part increases and then has the tendency to decrease in the latter 3 years due to the accumulation of salt. The strength inconsistency may exist in the wall due to the combined effects of salt accumulation and water evaporation, and the strength on the surface may be higher or lower than that of the inside due to the changes of surrounding conditions with time. The simulation results show that the wall has the best mechanical performance without damp and salt attacks.
Mechanical degradation of unstabilized rammed earth (URE) wall under salts and rising damp attack effect
https://orcid.org/http://orcid.org/0000-0001-7262-7660
The long-term chemo–thermo–hydro–mechanical behavior, the salt migration, and the salt attack on unstabilized rammed earth have been rarely investigated in the literature. The authors simulated the mechanical degradation of a typical unstabilized rammed earth (URE) wall under salts and rising damp attack effect by using the finite element method. The simulation results show that the water/salinity in a freshly built rammed earth wall decreases/increases significantly due to the water evaporation and capillary effects after construction, and these effects are stabilized in the following 3 years. Globally, the wall is wetter, cooler, and saltier in winter than in summer and has a lower strength. The strength in the upper part of the wall is higher than in the lower part. In the first 4 years after construction, the strength in the upper part increases and then reaches an equilibrium stage with time, while the strength in the lower part increases and then has the tendency to decrease in the latter 3 years due to the accumulation of salt. The strength inconsistency may exist in the wall due to the combined effects of salt accumulation and water evaporation, and the strength on the surface may be higher or lower than that of the inside due to the changes of surrounding conditions with time. The simulation results show that the wall has the best mechanical performance without damp and salt attacks.
Mechanical degradation of unstabilized rammed earth (URE) wall under salts and rising damp attack effect
Acta Geotech.
Zhang, Xiang (Autor:in) / Nowamooz, Hossein (Autor:in)
Acta Geotechnica ; 18 ; 5029-5046
01.09.2023
18 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Multiphysics changes , Numerical simulations , Rising damp , Salt attack , Unstabilized rammed earth , Variation by time Engineering , Geoengineering, Foundations, Hydraulics , Solid Mechanics , Geotechnical Engineering & Applied Earth Sciences , Soil Science & Conservation , Soft and Granular Matter, Complex Fluids and Microfluidics