Concrete NDT Comes of Age:Condition Assessment of a Concrete Spillway Crest Slab

سال انتشار: 1379
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 3,640

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شناسه ملی سند علمی:

IRCOLD04_40

تاریخ نمایه سازی: 14 آذر 1384

چکیده مقاله:

Nondestructive testing (NDT) of concrete structures has always been problematic simply because of the complex nature and the heterogeneity of the material. This paper explores one of the most promising NDT methods used in today’s civil and mining industry. The technique is based on the study of the reflection system of low frequency (20-50 kHz) body waves. The propagation of low frequency waves is well suited for heterogeneous materials because the waves suffer less attenuation which is typically promoted by absorption and scattering. The following paragraphs introduce the reader to the MSR Impact-Echo (MSR-IE) technique and discuss its capabilities in the framework of in situ assessment of concrete structures. This paper presents an in situ investigation performed on the crest slab of a spillway section of a concrete gravity dam. The focus of this article concentrates on the investigation of a recently performed restoration of a spillway section where unexplained surface opening cracks have formed on the top side of a spillway’s concrete slab. The MSR-IE method was used to evaluate the extent of the damage caused by the surface bearing fissures. The investigation revealed that the cracks were limited to the depth of the repaired section and that some regions of the slab clearly showed signs of a debonded interface between old and new concrete layers.The results of the in situ investigation led to cost-effective repair strategy.

نویسندگان

Ferri P. Hassani

McGill University, Dept. of Mining and Metallurgical Engineering, ۳۴۵۰ University St., Montreal, Québec H۳A ۲A۷ Canada.

Philippe Guevremont

McGill University, Dept. of Mining and Metallurgical Engineering, ۳۴۵۰ University St., Montreal, Québec H۳A ۲A۷ Canada.

Moe Momayez

McGill University, Dept. of Mining and Metallurgical Engineering, ۳۴۵۰ University St., Montreal, Québec H۳A ۲A۷ Canada.

Kaveh Saleh

Institute of Research of Hydro-Québec (IREQ), Civil Engineering Research Group, ۱۷۴۰ Lionel Boulet blvd, Varennes, Québec,J۳X ۱S۱ Canada.

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لیست زیر مراجع و منابع استفاده شده در این مقاله را نمایش می دهد. این مراجع به صورت کاملا ماشینی و بر اساس هوش مصنوعی استخراج شده اند و لذا ممکن است دارای اشکالاتی باشند که به مرور زمان دقت استخراج این محتوا افزایش می یابد. مراجعی که مقالات مربوط به آنها در سیویلیکا نمایه شده و پیدا شده اند، به خود مقاله لینک شده اند :
  • Guevremont, P., Hassani, F.P., Momayez, M. (1999). Use of NDT ...
  • Saleh, K., Hassani, F.P., Guevremont, P., Sadri, A., Lapointe, R., ...
  • نمایش کامل مراجع