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	Inspection of Construction Structures Pečínka, L. ; Cikrle, P. ; Svoboda, D. ; Trnka, Jan ; Morávka, S. ; Šteinbruch, J. ; Schererová, K. ; Stuhlík, P. The reasearch report is aimed to methods and techniques for detection failures in concrete structures.The used methods were Impact-Echo method, High-frequency radar and Ultrasound. Detailed record
	Non-destructive Testing of Concrete Structures by Laser Vibrometry Trnka, Jan ; Dvořáková, Pavla ; Veselý, Eduard The reasearch report deals with non-destructive testing of concrete structures by Laser Vibrometry. The aim of the work was to find pros and cons of an application of laser vibrometry for detection failures in concrete structures. Detailed record
	Influence of interfacial transition zone of cement paste-aggregate on crack propagation: finite element modelling Keršner, Z. ; Náhlík, Luboš ; Knésl, Zdeněk Concrete is represented as a three-phase material in this paper. Behaviour of a single macrocrack approaching to the interface between hardened cement paste (matrix) and aggregate (particle) is modelled and interfacial transition zone is taken into account. Results of these analyses are useful for description of fracture behaviour of macrocrack propagation with respect to material parameters of matrix, interfacial transition zone and particle. FEM is used in this study. Detailed record
	INFLUENCE OF DEGRADATION OF HARDENED CEMENT PASTE ON FRACTURE BEHAVIOUR OF CONCRETE Náhlík, Luboš ; Keršner, Z. ; Knésl, Zdeněk Fracture behaviour of concrete is studied using two-phase material model. Propagation of a single macrocrack in hardened cement paste (matrix) and aggregate (particle) is modelled. Influence of carbonation of matrix on crack propagation in composite is assessed and discussed in this paper: degradation of hardened cement paste is important aspect of fracture behaviour of concrete. Detailed record
	Disintegration of concrete and rocks by modulated water jet: laboratory experiments Sitek, Libor ; Foldyna, Josef ; Ščučka, Jiří Problem of preparation of concrete and rock surfaces before repair using modulated water jet is a subject of the paper. Selected results of laboratory tests of disintegration of various types of concrete as well as rocks are presented and compared with results of concrete and rock disintegration by means of continuous water jet under the same operating conditions. Detailed record
	Modelling of two-phases materials: the influence of shape and size of paticles Náhlík, Luboš ; Keršner, Z. ; Knésl, Zdeněk Concrete is modelled as a two-phase material in this paper. Behaviour of a crack ith its tip on the interface between two different materials - hardened cement paste (matrix) and aggregate (particle) - is studied. In contrast to cracks in homogeneous materials the stress singularity for a crack terminating at the interface is of the type r Detailed record
	Concrete as a two-phase material: statistical/sensitivity modelling of failure Keršner, Z. ; Náhlík, Luboš ; Knésl, Zdeněk Concrete is represented as a two-phase material. Behaviour of a crack with its tip on the interface between two different materials ů hardened cement paste (matrix) and aggregate(particle) ů is modelled. Input variables of the model are considered as random variables using LHS method/FREET software. Then results of statistical/sensitivity analyses of output variable ů the critical stress for the intersection of coarse aggregate particle ů are presented. Detailed record
	Fracture process zone of concrete: analysis of aggregate-crack interaction Keršner, Z. ; Náhlík, Luboš ; Knésl, Zdeněk Concrete is modelled as a two-phase material. Behaviour of a crack with its tip on the interface between two different materials - hardened cement paste (matrix) and aggregate (particle) - is studied. In contrast to cracks in homogeneous materials the stress singularity for a crack terminating at the interface is of the type r -lambda, where the value of the stress singularity exponent, lambda, is in the interval 0 < lambda < 1. Than classical fracture mechanics theory and criterion cannot be applied. In the paper a new stability criterion is used to estimate the critical stress for the intersection of coarse aggregate particles. Detailed record
	Critical stress for crack propagation in concrete Náhlík, Luboš ; Knésl, Zdeněk Concrete is modelled as a two-phase material. Behaviour of a crack with its tip on the interface between two different materials - hardened cement paste (matrix) and aggregate (particle) - is studied. In contrast to cracks in homogeneous materials the stress singularity for a crack terminating at the interface is of the type r -lambda, where the value of the stress singularity exponent, lambda, is in the interval 0 < lambda < 1. Than classical fracture mechanics theory and criterion cannot be applied. In the paper a new stability criterion is used to estimate the critical stress for the intersection of coarse aggregate particles. Detailed record
	Interaction of crack and aggregate in concrete Keršner, Z. ; Náhlík, Luboš ; Knésl, Zdeněk Concrete is represented as a two-phase material in this paper. Behaviour of a single macrocrack approaching to the interface between hardened cement paste (matrix) and aggregate (particle) is modelled. It is shown that in the case of where Young modulus of cement paste is greater then those of aggregates, the effective fracture toughness of concrete is predominantly given by fracture properties of aggregates. Detailed record

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