By J.-L. Granju, B. Bissonnette, L. Courard (auth.), Benoît Bissonnette, Luc Courard, David W. Fowler, Jean-Louis Granju (eds.)
Among assorted ways that may be thought of for concrete rehabilitation, bonded overlays are usually the main cost-effective substitute. the first objective of overlays is to increase the lifetime of the candidate constructions, both via restoring the standard and integrity of the skin and/or the re-establishing or enhancing the load-carrying means. however, the sturdiness of bonded overlay structures nonetheless attracts matters within the technical neighborhood as a result of bond sustainability difficulties encountered in a few situations. at the moment, there's nonetheless no authorised layout method or method that could warrant the practitioner a winning final result of the fix. This State-of-Art record summarizes the findings with admire to all elements occupied with the masking process.
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Additional resources for Bonded Cement-Based Material Overlays for the Repair, the Lining or the Strengthening of Slabs or Pavements: State-of-the-Art Report of the RILEM Technical Committee 193-RLS
When this identification phase is completed, providing an insight into the possible origins of the problems, a more quantitative and problem-specific evaluation can be performed . This second stage is the quantification stage. 2 Condition Survey of Distress Two types of road structures are usually concerned: discontinuous concrete slabs and continuously reinforced concrete pavement overlays. The evaluation of the road structure is based on the following activities: • • • • visual examination; investigations; analysis of observations; and diagnostic.
4 Feasibility Analysis It is known that the values measured from NDT, which characterize only one particular physical property of the concrete, are influenced in different ways by the constituents of concrete and curing conditions. 21). With regard to the properties that have to be determined, it is often interesting to first assess all the structures, in such a way that it is possible afterwards to point out zones where more investigations are needed. The NDT methods are particularly interesting in this aim: for example, UP-V and rebound hammer are usually combined.
4 Material Evaluation Material evaluation can be deduced from destructive and non-destructive testing. There is, in fact, no standard definition for non-destructive testing. To some, they are tests that do not alter the concrete. For some, they are tests that do not impair the function of a structure, in which case the drilling of cores is considered as a NDT test. An interesting classification of NDT has been proposed by Carino . e. to evaluate integrity. Visual inspection is one of the most versatile and powerful of the NDT methods, and it is typically one of the first steps in the evaluation of a concrete structure.