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Experimental Study on Tensile Property of Concrete Exposed to Simulated Acid Rain Environment

Author: CaoXiaoXiang
Tutor: FanYingFang
School: Dalian Maritime University
Course: Road and railway projects
Keywords: Concrete Different scales Acid Rain Corrosion Tensile properties
CLC: U444
Type: Master's thesis
Year: 2010
Downloads: 64
Quote: 1
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Abstract


Concrete structures during service has long been the erosion of acid rain, will produce a series of physical and chemical reactions gradually deteriorates, resulting in its service life is much lower than the design life. Therefore, reveal that the mechanical properties of concrete under the acid rain environmental damage law is the premise and foundation research bearing capacity and durability of the whole structure, has important theoretical significance and practical value. The financial support of the National Natural Science Foundation of China (Project No.: 50708010) the chemical erosion vehicle coupling under reinforced concrete bridges carrying capacity research \test block, the reference to the chemical composition of typical urban acid rain and configure the the pH1.0 acidic solution to simulated acid rain environment, acid rain environment corroded concrete tensile mechanical properties test three different scales from the macro, meso, micro . The research topics include: tensile tests on concrete specimens experienced different corrosion time variation of appearance, quality and tensile stress - strain curve, different corrosion degree of macro-mechanical properties of concrete indicators, such as tensile strength, peak strain, and the variation of the elastic modulus; each of the mass loss rate, tensile strength, relative to the rate of change, the peak strain relative to the rate of change, the degree of injury of the modulus of elasticity relative to the rate of change of four indicators evaluation concrete discussed by acid rain erosion of the internal structure of concrete deterioration mechanism. CT scanners scan analysis of concrete specimens by acid rain, CT cross-section images of the concrete cross-section before and after corrosion comparative analysis revealed changes in the internal structure of the corrosion of concrete from the meso level observed concrete process of internal structural damage; based on CT scan data using Matlab to achieve a three-dimensional reconstruction of the concrete specimen, a true representation of the three-dimensional diagram of concrete, to more accurately reflect the actual composition of the specimen than other technologies for the qualitative and quantitative analysis of the hole and cracks, the mechanical behavior of concrete, concrete failure mechanism, will have an important analytical foundation. Concrete specimens in the corrosion process of simulated acid rain solution using scanning electron microscopy (SEM), further to reveal concrete acid rain from the micro-level, the changes of the internal microstructure of the concrete specimens. Macro, fine, microscopic study of three different scales, based on analysis by the corrosion of concrete macro-mechanical properties evaluation of subtle concept to establish the foundation for a future.

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CLC: > Transportation > Road transport > Bridges and Culverts > Bridge materials
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