Study On Mechanical Properties Of Mortar Which Is Attacked By Test

Sulfate corrosion is one of important factors that influence the duration of concrete. Aim at this problem, this paper carries out microcosmic studies on mortar, which is in sulfate environment, by means of tests. And several results have been gained as follow:1. This paper carries out uneasily compression on samples of different water-cement ratios and corrosion degrees. Through analyzing compressive strength, modulus of elasticity and strain, laws of mechanical parameters coinciding with corrosion degrees are revealed.2. Through uneasily fatigue tests, trends of modulus of elasticity coinciding with the peak strain in every block cycle during the periods of exerting load and discharging load are concluded. In addition, wetting-drying cycles test are exerted on samples immerged in sulfate solution, after wetting-drying cycles, velocities of acoustic emission signals and modulus of elasticity in samples are measurated. And this paper has analyzed laws of velocity and modulus of elasticity coinciding with corrosion degrees.3. Furthermore, this paper uses segmented damage curve modal to fitting dates, and finds that damage parameter by fitting can reflect corrosion degrees to some extent. Based on the definition of damage, damage qualities will decrease coinciding with the increasing of corrosion degree.4. This paper also collects acoustic emission signals during the whole process of uneasily compression. Based on the mechanism of acoustic emission and the characters of deformation, this paper carves acoustic emission curves into four periods, and describes characters of each period. In addition, In addition mercury experimental has been carried out on samples of different degrees, variation law of macrocosmic mechanical properties are explained further through microcosmic scale.