Cohesive Fracturing and Stresses Caused by Hydration Heat in Massive Concrete Wall
نویسندگان
چکیده
Avoidance of cracking damage due to hydration is an important objective in the design of nuclear reactor containments. Assessment of the safety against cracking requires a realistic material model and its effective numerical implementation. Toward this goal, the paper develops a comprehensive material model which includes approximate simulation of cracking based on the principles of cohesive fracture mechanics, as well as an up-to-date creep formulation with aging and temperature effects. A standard heat conduction model is incorporated in the analysis as well. Since the crack width is the most important characteristic of cracking damage, particular attention is paid to crack spacing which governs crack width. The results of stability analysis of parallel crack systems based on fracture mechanics are used to estimate the spacing of open cracks as a function of their depth. Numerical simulations clarifying various aspects of hydration heat effects are presented. DOI: 10.1061/~ASCE!0733-9399~2003!129:1~21! CE Database keywords: Walls; Concrete; Cracking; Stress; Simulation.
منابع مشابه
Decontamination of Radionuclides from Concrete by Microwave Heating. I: Theory
The paper analyzes a proposed scheme of decontamination of radionuclides from concrete structures, in which rapid microwave heating is used to spall off a thin contaminated surface layer. The analysis is split in two parts: ~1! the hygrothermal part of the problem, which consists in calculating the evolution of the temperature and pore pressure fields, and ~2! the fracturing part, which consist...
متن کاملFeasibility of Using Phase Change Materials to Control the Heat of Hydration in Massive Concrete Structures
This paper presents experimental results that can be applied to select a possible phase change material (PCM), such as a latent heat material (LHM), to control the hydration heat in mass concrete structures. Five experimental tests (microconduction, simplified adiabatic temperature rise, heat, and compressive strength tests) were conducted to select the most desirable LHM out of seven types of ...
متن کاملNumerical investigation of composite shear walls with different types of steel and concrete materials as boundary elements
The main objective of this study was to numerically assess the effect of boundary elements with different types of steel and concrete materials on nonlinear behavior of composite steel–reinforced concrete wall (CSRCW) by employing ABAQUS software. Two types of common steel profiles including box and I-shaped sections, located at the middle and extremities of the wall, were employed to assess th...
متن کاملBinary Effect of Fly Ash and Palm Oil Fuel Ash on Heat of Hydration Aerated Concrete
The binary effect of pulverized fuel ash (PFA) and palm oil fuel ash (POFA) on heat of hydration of aerated concrete was studied. Three aerated concrete mixes were prepared, namely, concrete containing 100% ordinary Portland cement (control sample or Type I), binary concrete made from 50% POFA (Type II), and ternary concrete containing 30% POFA and 20% PFA (Type III). It is found that the tempe...
متن کاملOptimization of time and temperature of dam construction for thermal analysis of RCC dam
In RCC dams, usually large amounts of concrete are poured in a short time that the heat generated by the cement hydration has led to an increase in temperature in the dam body. In this research, Abacus software, which is a finite element software, has been used for thermal analysis of the dam during construction and concreting. This is how thermal changes are applied. For the structure of 50 c...
متن کامل