Study on concrete structure's durability considering the interaction of multi-factors

摘要

The durability of concrete's material and structure is affected by the combined action of multiple factors, and in particular, the effect of stress on the durability should be treated seriously. The quick carbonation experiment of concrete's material is conducted based on bracket-type loading device and appropriate experimental program in comprehensive consideration of the factors including external loads, environmental corrosion medium, material properties and ages, from which representative factors such as stress levels, CO2, water-cement ratios and carbonation ages are selected. The experimental result shows that concrete's carbonation rate decreases gradually with time; tensile stress can accelerate the concrete carbonation whereas compressive stress retards carbonation; within a certain range, the greater the water-cement ratio, the faster the carbonation rate is. Carbonation model is presented based on the crossed influence of multi-factors by regression fitting and analysis of the test data. After validated by engineering example, the model is reasonable. (C) 2016 Elsevier Ltd. All rights reserved.