关键词: 高密度电阻率法, 混凝土, 缺陷, 检测

Abstract: For adopting high density resistivity method to detect defects of concrete, a physical model dimensioning 6 m×2 m×10 m and containing diverse defects was fabricated in the construction site of the Three Gorges Project. The concrete resistivity distribution image was obtained by the high resistivity metod. It revealed that the positions and forms of defects such as vertical fissures, pouring voids and loose zones in concrete can generally be identified, but the effect is not well as the size of defects is less than 0.3 m. The suitable detecting time for newly poured conerete ought be after 7 d of initial consolidation and the moisture content at every points inside concrete reaching basically the same.