摘要
腐蚀疲劳是公路工程用混凝土破坏的主要原因,利用自行设计的腐蚀疲劳加载试验装置,研究了高性能混凝土(HPC)在Na2SO4腐蚀溶液及三分点疲劳荷载耦合作用下的弯拉强度,分析了抗Cl-渗透特性及其疲劳破坏机理。结果表明,受腐蚀疲劳作用的高性能混凝土,其抗渗透性能大幅度下降,而交变应力、腐蚀介质的共同作用是其性能劣化的根本原因,降低单方混凝土用水量及掺加20%(质量分数)的粉煤灰可明显提高其密实度和抗腐蚀疲劳特性。
Corrosion fatigue is the main reason leading to concrete damage in highway engineering. With the loading test equipment of corrosion fatigue designed by the author, the paper studied the flexural tensile strength of high performance concrete （HPC） withstanding the simuhaneous action of Na2SO4 corrosion solution and third point loading, and analyzed the anti-CI^- permeability character and its fatigue damage mechanism. The results show that the anti-permeability performance of HPC bearing corrosion fatigue decreases greatly, the basic reason of which is the joint action of alternating load and corrosion medium, Besides decreasing water dose of concrete per m^3 and adding 20% fly-ash can evidently enhance the density and anti- corrosion fatigue character of HPC.
出处
《武汉理工大学学报》
EI
CAS
CSCD
北大核心
2005年第8期31-34,共4页
Journal of Wuhan University of Technology
关键词
公路工程
腐蚀疲劳
高性能混凝土
渗透性
破坏机理
highway engineering
corrosion fatigue
high performance concrete
permeability
damage mechanism
