Degradation Mechanism of Reinforced Concrete Beams under Multi-field Coupling

摘要：

By applying fast freeze-thaw circles and mixedcorrosion solution in the laboratory environment, the deterioration in the mechanical behavior of reinforced concrete beams with different persistent loading is studied. A mixed solution of 3％ NaCl and 0.34％ MgSO4 is used as corrosion medium. The freezethaw action and mixed corrosion solution are alternatively applied to the studied beams. The behavior degradation of reinforced concrete beams after 300 0.10, 0.33 and 0.50, respectively. Results show that the strength and elastic modulus of concrete decrease with the increasing number of freeze-thaw cycles. SEM (Standard Electronic Modules) and XRD (X-ray Diffraction) experiments are also carried out after static loading tests to investigate microstructure and chemical changes of concrete.When persistent loading is coupled with the action of freeze-thaw and mixed corrosion, the degradation of the mechanical properties of reinforced concrete beams will be accelerated. For the same number of alternate cycles of freeze-thaw and mixed corrosion, more decrease in the ultimate bearing capacity has been found when the persistent load is larger.

关键词： reinforced concrete beam freeze-thaw cycle mixed corrosion solution degradation persistent load SEM

作者: ZHENG Xiaoning DIAO Bo SUN Yang ZHANG Jian

作者单位: Department of Civil Engineering, Beihang University, Beijing 100191, China

会议类型: 国际会议

会议名称: The 2010 International Symposium on Safety Science and Technology(2010 安全科学与技术国际会议)

会议地点: 杭州

会议语种:英文

页码: 1768-1773

在线出版日期: 2010-10-26（万方平台首次上网日期，不代表论文的发表时间）