Deterioration Detection of ASR Damage on Cement-based Materials Using Nonlinear Acoustical Methods
Alkali-silica reaction (ASR) damage is a very common material degradation in civil engineering and its critical structural effects in dams, bridges and buildings were highlighted in recent years. This effect on concrete deterioration requires the quantitative assessment. Few studies have been reported on acoustical features of the ASR damage. Nonlinear ultrasonic techniques have great potential to characterize damage accumulation in cement-based materials. This research discusses the ASR damage process and uses nonlinear ultrasonic waves to quantify the accumulation of deterioration, specifically micro-cracks, in cement-based materials. Multiple one-dimensional, mortar bar specimens are produced using alkali-reactive aggregate and exposed to environmental conditions, following ASTM C 1260, and the micro-cracking by ASR is formed gradually. Nonlinear ultrasonic techniques are then used to incrementally track this damage accumulation. The effectiveness of a nonlinear acoustical modulation method is considered. These ultrasonic results show a quantifiable increase in nonlinearity as the ASR expansion (relative increase in length) reaches about 0.05％, which is generally considered to be the strain at which micro-cracks are initially formed in cement- based materials; this agreement demonstrates that the nonlinear ultrasonic properties are greatly influenced by the formation of these micro-cracks, and have the potential to be used for detection of deterioration in cement-based materials.
Deterioration detection Nonlinear acoustical method ARS damage
Xiaojia Chen Kim Jinyeon Chengwu Shen Jacobs L. J.
School of Transportation, Wuhan Univ. of Technology, Wuhan 430063, China School of Mechanical Engrg., Georgia Inst. of Tech., Atlanta, GA 30332, USA School of Mechanical Engrg., Georgia Inst. of Tech., Atlanta, GA 30332, USA School of Civil & Enviro
国际会议
南京
英文
1274-1278
2007-10-16（万方平台首次上网日期，不代表论文的发表时间）