A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Early age cracking relevant to mass concrete dam structures during the construction schedule
https://orcid.org/0009-0006-5109-0642
https://orcid.org/0000-0001-8021-6693
https://orcid.org/0000-0003-3820-815X
Abstract Managing the early-age thermal behavior of mass concrete structures like dams, dykes, bridge piers, thick raft foundations, etc., is the major concern during their construction. The heat of hydration (HOH) of the fresh concrete pour does not get easily dissipated to ambiance since concrete is predominantly a poor conductor of heat. Eventually, in the presence of external boundary conditions (thermal or mechanical), the slower rate of heat dissipation may at times induce a substantial thermal gradient within the mass concrete which further may induce thermal stresses leading to the formation of cracks. The article attempts to develop a thermo-mechanical numerical model based on the finite element (FE) methodology to mimic the early age behavior of mass concrete that accounts for time and temperature-dependent heat generation during the hydration process with the evolution of thermal and mechanical properties over time. A two-stage sequential thermo-mechanical model is developed consisting of a thermal model to assess the thermal history of a particular concrete mix which is experimentally validated by performing thermal monitoring of a fresh concrete pour for 10 days, and a mechanical model to assess the stress and the cracking states, the model utilizes the concrete damage plasticity (CDP) model based on the principle of continuum damage mechanics which is characterized by experimental results. Later on, the methodology so developed is employed over a practical scenario of the dam construction process considering the relevant boundary conditions to arrive at a suitable optimum lift height and pouring frequencies.
Highlights Numerical model for thermo-mechanical behavior of mass concrete at early age. Experimental validation of thermal history of concrete in normal and cold weather. Informed decision making in deciding optimal lift heights and placement frequencies.
Early age cracking relevant to mass concrete dam structures during the construction schedule
https://orcid.org/0009-0006-5109-0642
https://orcid.org/0000-0001-8021-6693
https://orcid.org/0000-0003-3820-815X
Abstract Managing the early-age thermal behavior of mass concrete structures like dams, dykes, bridge piers, thick raft foundations, etc., is the major concern during their construction. The heat of hydration (HOH) of the fresh concrete pour does not get easily dissipated to ambiance since concrete is predominantly a poor conductor of heat. Eventually, in the presence of external boundary conditions (thermal or mechanical), the slower rate of heat dissipation may at times induce a substantial thermal gradient within the mass concrete which further may induce thermal stresses leading to the formation of cracks. The article attempts to develop a thermo-mechanical numerical model based on the finite element (FE) methodology to mimic the early age behavior of mass concrete that accounts for time and temperature-dependent heat generation during the hydration process with the evolution of thermal and mechanical properties over time. A two-stage sequential thermo-mechanical model is developed consisting of a thermal model to assess the thermal history of a particular concrete mix which is experimentally validated by performing thermal monitoring of a fresh concrete pour for 10 days, and a mechanical model to assess the stress and the cracking states, the model utilizes the concrete damage plasticity (CDP) model based on the principle of continuum damage mechanics which is characterized by experimental results. Later on, the methodology so developed is employed over a practical scenario of the dam construction process considering the relevant boundary conditions to arrive at a suitable optimum lift height and pouring frequencies.
Highlights Numerical model for thermo-mechanical behavior of mass concrete at early age. Experimental validation of thermal history of concrete in normal and cold weather. Informed decision making in deciding optimal lift heights and placement frequencies.
Early age cracking relevant to mass concrete dam structures during the construction schedule
https://orcid.org/0009-0006-5109-0642
https://orcid.org/0000-0001-8021-6693
https://orcid.org/0000-0003-3820-815X
Abstract Managing the early-age thermal behavior of mass concrete structures like dams, dykes, bridge piers, thick raft foundations, etc., is the major concern during their construction. The heat of hydration (HOH) of the fresh concrete pour does not get easily dissipated to ambiance since concrete is predominantly a poor conductor of heat. Eventually, in the presence of external boundary conditions (thermal or mechanical), the slower rate of heat dissipation may at times induce a substantial thermal gradient within the mass concrete which further may induce thermal stresses leading to the formation of cracks. The article attempts to develop a thermo-mechanical numerical model based on the finite element (FE) methodology to mimic the early age behavior of mass concrete that accounts for time and temperature-dependent heat generation during the hydration process with the evolution of thermal and mechanical properties over time. A two-stage sequential thermo-mechanical model is developed consisting of a thermal model to assess the thermal history of a particular concrete mix which is experimentally validated by performing thermal monitoring of a fresh concrete pour for 10 days, and a mechanical model to assess the stress and the cracking states, the model utilizes the concrete damage plasticity (CDP) model based on the principle of continuum damage mechanics which is characterized by experimental results. Later on, the methodology so developed is employed over a practical scenario of the dam construction process considering the relevant boundary conditions to arrive at a suitable optimum lift height and pouring frequencies.
Highlights Numerical model for thermo-mechanical behavior of mass concrete at early age. Experimental validation of thermal history of concrete in normal and cold weather. Informed decision making in deciding optimal lift heights and placement frequencies.
Early age cracking relevant to mass concrete dam structures during the construction schedule
Singh, Maninder Pal (author) / Sen, Subhamoy (author) / Pathak, Himanshu (author) / Dogra, Ajay Bhushan (author)
2023-12-22
Article (Journal)
Electronic Resource
English
Early Concrete Cracking of Composite Bridges During Construction
| British Library Conference Proceedings | 2002
Early Concrete Cracking of Composite Bridges During Construction
| British Library Conference Proceedings | 2002