Browsing Ústav stavebního zkušebnictví by Title
Now showing items 1-20 of 89
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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 ... -
Advanced Evaluation of the Freeze–Thaw Damage of Concrete Based on the Fracture Tests
(MDPI, 2021-10-25)This paper presents the results of an experimental program aimed at the assessment of the freeze–thaw (F–T) resistance of concrete based on the evaluation of fracture tests accompanied by acoustic emission measurements. ... -
Analysis of Acoustic Emission Signals Recorded during Freeze-Thaw Cycling of Concrete
(MDPI, 2021-03-05)This manuscript deals with a complex analysis of acoustic emission signals that were recorded during freeze-thaw cycles in test specimens produced from air-entrained concrete. An assessment of the resistance of concrete ... -
The Application of Acoustic Emission Technique to Monitor the Early Setting Process of Cement Pastes
(EDP Sciences, 2019-12-12)The obtained physico-mechanical properties (mainly flexural and compressive strength) of cement-based composite materials depend on various factors (type of mixture, its composition, standard hardening process, proper ... -
The bond strength by pull-off and direct tensile strength of concrete damaged by elevated temperatures
(IOP Publishing, 2018-07-16)This paper presents the results of an experimental study of selected characteristics of concrete following its exposure to high temperatures. The monitored parameter was the influence of high temperatures on the bond ... -
Characteristic Curve and Its Use in Determining the Compressive Strength of Concrete by the Rebound Hammer Test
(MDPI, 2019-08-23)During the construction of concrete structures, it is often useful to know compressive strength at an early age. This is an amount of strength required for the safe removal of formwork, also known as stripping strength. ... -
Comparison of Measurements Methods Intended to Determination of the Shrinkage Development in Polymer Cement Mortars
(Elsevier, 2017-07-20)The paper deals with the experimental determination of the shrinkage progress of the polymer cement (PCC) mortars. The main motivation of performed measurements was to compare the results obtained from two different ... -
Complex multilevel fracture tests of concrete: basic mechanical fracture parameters of standard size specimens.
(EDP Sciences, 2020-10-05)The aim of the current research is to develop a complex multilevel approach for experimental–computational determination of mechanical fracture parameters of concrete as a typical quasi-brittle material. This includes ... -
Components of the Fracture Response of Alkali-Activated Slag Composites with Steel Microfibers
(MDPI, 2019-05-16)Knowledge of the mechanical and primarily fracture parameters of composites with a brittle matrix is essential for the quantification of their resistance to crack initiation and growth, and also for the specification of ... -
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 ... -
Cost-Effective High-Performance Concrete: Experimental Analysis on Shrinkage
(MDPI, 2019-08-26)This paper focuses on the experimental determination of the shrinkage process in Self-Compacting High-Performance Concrete (SCC HPC) exposed to dry air and autogenous conditions. Special molds with dimensions of 100 mm × ... -
Deflection of an eccentric crack under mixed-mode conditions in an SCB specimen
(The Publishing Office of Czestochowa University of Technology, 2021-07-26)Crack propagation under mixed-mode (I + II) conditions has been investigated in a semicircular disc where various levels of mixed-mode can be achieved by means of different geometry configurations. The research has been ... -
Destructive and non-destructive assessment of the frost resistance of concrete with different aggregate
(IOP Publishing, 2018-07-12)The paper focuses on determining the frost resistance of concrete using selected destructive and non-destructive test methods. The experiment was performed with four specially made concretes, which differed only in the ... -
Detection of reinforcement in the non-traditional building structures - historical statues
(IOP Publishing, 2018-07-16)During restoration and maintenance of historical buildings, statues and sculptures are often neglected elements in the pre-construction condition surveys, especially in case they are not part of the supporting structure ... -
Determination of the static modulus of elasticity of cement mortars in the early stage of ageing
(EDP Sciences, 2020-03-05)The paper deals with the influence of the composition of cementitious materials on the development of their modulus of elasticity in the early stage of ageing. The primary goal of the paper is to determine the static modulus ... -
Determining reinforcement coverage using an electromagnetic rebar detector
(IOP Publishing, 2018-07-16)Correct reinforcement is an essential part of constructing reinforced concrete structures. Errors in positioning, diameter, or coverage may result in defects, which is why it is necessary to make sure the reinforcement is ... -
Development of new methods for determining the distribution of steel fibres in the hardened steel fibre reinforced concrete – possibilities of production and verification of test specimens
(IOP Publishing, 2018-07-16)Many research teams currently deal with the issue of determining the distribution of steel fibres in the hardened steel fibre reinforced concrete, both in terms of fibre concentration, and in terms of homogeneity of fibre ... -
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 ... -
Development of the Elastic Modulus of Concrete under Different Curing Conditions
(Elsevier, 2017-07-20)The modulus of elasticity is a property of concrete, which is known for its high variability of values. A high enough value of the modulus of elasticity is a critical requirement in complicated concrete structures and in ... -
Development of Variants of High-Performance Self-Compacting Concrete with Improved Resistance to the Attack of Sulfates
(MDPI, 2021-06-26)This paper presents experimental and analytical work of which the main objective was to support the introduction of a new technology for the production of sewer pipes. In this technology, the pipes produced consist of two ...