Browsing Ústav stavebního zkušebnictví by Issue Date
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NDT of Mechanical Damaged Concrete Specimens by Nonlinear Acoustic Spectroscopy Method
(Ministry of Transport, 2010-04-14)Current research and development of non-linear ultrasonic spectroscopy methods shows these methods to be very promising for material testing and defectoscopy in the near future. Our experiments focused on the testing of ... -
Influence of Periodic Freezing on the Value of the Elastic Modulus of the Light-weight Fibre Concrete
(Ministry of Transport, 2010-04-14)This paper deals with the influence of periodic freezing on light-weight concrete characteristics. Three differential sets of light-weight concrete specimens were periodically freezing and non-destructively testing during ... -
Freeze-thaw resistance of concrete with porous aggregate
(Elsevier Ltd., 2010-06-06)This paper deals with the influence of periodic freezing on lightweight concrete characteristics. Sets of lightweight concrete prismatic specimens are cyclically frozen in range from +20C to -20C and non-destructively ... -
Influence of freeze-thaw cycles on fracture parameters values of lightweight concrete
(Elsevier Ltd., 2010-06-06)Freezing and thawing resistance is very important characteristic also in the case of lightweight concrete. The paper deals with the influence of periodic freeze-thaw cycles on lightweight concrete fracture parameters values. ... -
Mechanical testing of newly developed biomaterial designed for intra-articular reinforcement of partially ruptured cranial cruciate ligament: ex vivo pig model
(University of Veterinary and Pharmaceutical Sciences in Brno, 2014-04-01)The study deals with mechanical testing of newly developed material polyethylene terephtalate coated with polycaprolactone nanofibers in combination with biodagradable Hexalon ACL/PCL screws as a new possibility of ... -
Influence of the gripping fixture on the modified compact tension test results: evaluation of the experiments on cylindrical concrete specimens
(VŠB-TUO, 2015-12-18)The modified compact tension test (MCT) might become in the future a stable test configuration for the evaluation of fracture-mechanics parameters or also for description of fatigue behavior of composites materials such ... -
Effect of carbon nanotubes on the mechanical fracture properties of fly ash geopolymer
(Elsevier, 2016-06-01)Fly ash geopolymer is amorphous aluminosilicate material which is considered as alternative to Portland cement concrete. One of the limiting factors of its utilization is an increased shrinkage and related deterioration ... -
Comprehensive Testing Techniques for the Measurement of Shrinkage and Structural Changes of Fine-Grained Cement-Based Composites during Ageing
(Hindawi Publishing Corporation, 2017-01-15)The paper deals with an experimental analysis focusing on the utilization of a specific measurement technique for determining the development of shrinkage and for monitoring structural changes in fine-grained cement-based ... -
Using acoustic emission methods to monitor cement composites during setting and hardening
(MDPI AG, 2017-04-28)Cement-based composites belong among the basic building materials used in civil engineering. Their properties are given not only by their composition but also by their behaviour after mixing as well as by the methods of ... -
Experimental Analysis on Shrinkage and Swelling in Ordinary Concrete
(Hindawi Publishing Corporation, 2017-05-22)The paper deals with the experimental determination of shrinkage development during concrete ageing. Three concrete mixtures were made. They differed in the amount of cement in the fresh mixture, 300, 350, and 400kg/m3. ... -
The use of the acoustic emission method for the monitoring of changes in the internal structure of polymer-cement mortars when testing the static compressive modulus of elasticity
(EDP Sciences – Web of Conferences, 2017-05-24)The paper focuses on the experimental determination of the dynamic and static compressive modulus of elasticity of selected polymer-cement mortars and their comparison. The dynamic modulus of elasticity was determined by ... -
Experimental assessment of the influence of multiple cyclic loading on the dynamic modulus of elasticity of concrete
(EDP Sciences – Web of Conferences, 2017-05-24)The goal of the experiment was to determine the influence that cyclic loading has on concrete dynamic modulus of elasticity and compressive strength. Each test specimen was subjected to cyclic loading with the loading force ... -
Development of shrinkage and fracture parameters in selected fine-grained cement-based composites
(EDP Sciences – Web of Conferences, 2017-05-24)The paper summarizes results of a pilot study aimed at the evaluation of an experimental investigation focused on determination of the material characteristics development of selected fine-grained cement-based composites ... -
Strength characteristics of concrete exposed to the elevated temperatures according to the temperature-time curve ISO 834
(EDP Sciences, 2017-05-24)While exposed to high temperatures caused by fire, the concrete undergoes a sequence of physical and chemical structure changes causing a mechanical degradation. This paper concerns an experimental strength determination ... -
Fracture parameters of concrete after exposure to high temperatures: pilot tests
(EDP Sciences, 2017-05-24)Experimental concrete panels were after an appropriate aging time loaded by high temperatures (550, 600, 800 and 1000 °C) in a furnace intended for fire tests of building materials. These panels were heated according to ... -
Effect of steel fibres dosage in alkali-activated slag mortars on acoustic emission obtained during three-point bending tests
(EDP Sciences – Web of Conferences, 2017-05-24)The acoustic emission phenomenon is directly associated with nucleation of cracks in structural materials during loading. This paper analyses acoustic emission signals captured during three-point bending fracture tests of ... -
Shrinkage, weight loss and fracture parameters of selected polymer-modified cement mortars during ageing
(VŠB – Technical University of Ostrava, 2017-06-01)Results of pilot experiments focused on monitoring of shrinkage, weight loss and mechanical fracture properties of two selected polymer-modified cement mortars (PCM) during their aging are presented in the paper. Comparison ... -
Evaluation of Shrinkage, Mass Changes and Fracture Properties of Fine-aggregate Cement-based Composites during Ageing
(Elsevier, 2017-06-02)The paper deals with the experimental determination of relative length changes development during cement based composite ageing. Special moulds with the dimensions 100 × 60 × 1000 mm were used for the measurements. These ... -
Tentative Characterization of Old Structural Concrete through Mechanical Fracture Parameters
(Elsevier, 2017-06-02)Structural concrete of the building of Vítkovice railway station from 1970s is characterized via mechanical fracture parameters. In this paper, six core-drilled cylindrical specimens with diameter of 75 mm were provided ... -
The Acoustic Emission Parameters Obtained during Three-point Bending Test on Thermal-stressed Concrete Specimens
(Elsevier, 2017-06-02)Fire response of concrete structural members depends on thermal, mechanical, and deformation properties of concrete. These properties vary significantly with temperature and also depend on the composition and characteristics ...