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  • Department of Building Materials

    ACTIVITY

    LABORATORY OF MICROSCOPY

    LABORATORY OF CHEMISTRY

    TESTING CLIMATIC CHAMBER

    CONTACTS

    The Department of Building Materials works on developing new building materials, especially materials based on silicates. It has modern XFR equipment and a Raman spectrometer for analyzing the chemical composition and structure of building materials, using a LEXT OLS 3000 microscope.

    The laboratory is a worksite where we study current problems in the construction industry, in collaboration with external experts. As a result of investing heavily in special machinery, and in human resources, we are able to carry out scientific research and consultations on a high level.

    • Concrete technology, assessment and design of concrete recipes
    • Physical and mechanical tests on concrete
    • Determining the physical and mechanical properties of in-situ concrete
    • Non-destructive tests on concrete and on other building materials
    • Quality assessment of in-situ rehabilitation of structures
    • Assessments of the resistance of building materials to aggressive external environments
    • Assessments of the resistance of building materials to physical impacts of the external environment
    • Diagnoses of damp buildings
    • Forecasts of the durability of building materials
    • Analyses of materials by new instrumental methods (XRF spectometry, Raman spectometry, structural analysis of materials using the LEXT OLS3000 microscope)
    • Postgraduate education in: concrete technology, special concretes, rehabilitation of damp buildings, tests on building materials and structures

    Microscopy laboratory

    Klokner Institute

    Czech Technical University in Prague

    Šolínova 7

    166 08 Praha 6

    Equipment

    LEXT OLS3000

    The Olympus LEXT OSLS3000 microscope is one of the new generation of optical systems with high 3D accuracy of imaging and measuring. It offers new possibilities for developing and checking various materials and parts. It is especially suitable for newly-emerging applications in microtechnology and nanotechnology that require non-standard contactless measuring methods,methods for checking materials, miniature parts, very delicate joints, and also for measuring surface roughness with submicron accuracy.

    It can be used for 3D observations for high-precision 3D measurements in real time. With its excellent 0,12 µm definition and its 120x – 14400x range of enlargement, Lext is suitable for researchers working at the limits of current optical microscopes and electron microscopes (SEM).

    Optical microscope

    Simple observations and measurements can be made with the Olympus optical stereo microscope. The main element is the stereoscopic microscope with ESD support, with range of enlargement 0.67x – 4.5x, zoom ratio 6.7:1, FN 22, inbuilt binocular tube with 60° inclination, working distance 110 mm, with adjustable upper and lower limit of the zoom stop, adjustment of eye pitch 52-76 mm.

    Grinding and polishing device

    KOMPAKT 1031 is robust device for metallographic grinding. It can be used for underwater grinding and also for polishing with suspensions or with diamond paste for all metallic and non-metallic materials.

    CitoVac

    This device is used for for watering and vacuum impregnation of porous samples.

    Activities

    • Grinding, polishing and watering samples
    • Measurements of real distances, volumes, areas and projections
    • Surface roughness measurements
    • Profile measurements
    • Analyses of parts
    • Checks on materials and coatings
    • Porosity measurements
    • Spacing factor
    • Analyses of defects, failures and cracks
    • Many other 3D imaging measurements

    Responsible person

    Ing. Michaela Kostelecká

    phone: +420 224 353 522

    e-mail: michaela.kostelecka@cvut.cz

    Chemistry laboratory

    Klokner Institute
    Czech Technical University in Prague
    Šolínova 7
    166 08 Praha 6 

    Equipment

    Spectroscan MAKC GVII X-ray fluorescent spectrometer

    The Spectroscan MAKC GVII sequential wave dispersal X-rayfluorescent spectrometer is used for analysing solid substances, liquids, powders and other forms in the concentration range from ppm to 100%. This device makes qualitative and quantitative analyses of various types of materials in the range from Na to U, but its main use is for determining a wide spectrum of components, for example in the field of silicates (mortars, concretes, ceramics), rocks, metals, alloys, plastics, etc. The Spectroscan MAKC-GVII spectrometer consists of the following parts:

    1. Spectrometer’s own vacuum unit with a samples feeder, including a vacuum goniometer, a high-voltage supply for X-ray spectrometry, the controlling electronics and a precise sample feeder that rotates the sample, for analysing non-homogenous samples
    2. Computer-controlled closed recirculating cooling unit for cooling the X-ray equipment
    3. Vacuum pump
    4. Controlling and evaluating computer (PC), with a printer
    5. Stabilizing and backup source with double conversion

    Ahura First Defender mobile Raman spectrometer

    The Ahura First Defender Mobile Raman spectrometer is used for identifying organic and inorganic substances. The spectrometer makes analyses of samples (liquids, powders, solid samples) in phials (there is a place for inserting phials) or in direct contactless analyses of free spilt and poured samples,and analyses through certain types of coatings (glass, transparent plastics for irradiation, etc.). The spectrometer measures emission dispersion spectra in the near infrared region and in part of the visible area of the Raman dispersion spectrum. These dispersion spectra have a rich structure that corresponds with the characteristic vibration of molecules and bonds of molecules. The spectrometer automatically compares the acquired emission spectrum with spectra saved in the database of the device, and automatically identifies the substance. Unlike algorithms widely used in spectrometry, this system can also detect compounds of substances with up to 5 components. The spectrometer is constructed as a maintenance-free device with very simple servicing and great robustness. It is primarily constructed for use in the field, but can also be used as a standard laboratory device. Analyses take from from 1 minute (when measuring substances with sufficient emission after sampling, and analyses of individual substances) to several minutes (for analyses of mixtures of substances. When there are 7800 substances in the database, the composition of the mixed spectrum of a mixture of 5 items involves several trillions of combinations, analyses through coatings, etc.)

    CAPEL 105M capillary electrophoresis

    Capillary electrophoresis (CE) is a modern instrumental analytic method, based on the different speed of migration of ionized substances in a direct current electric field. The principle is two-way separation of the substances present in a sample into electrophoresis zones that migrate by a capillary column andare detected and evaluated. Advantages of capillary electrophoresis are the speed of the analysis, low consumption of agents, and, above all, low operating costs. The device is used in particular for identifying inorganic substances, and also some organic ions in a liquid environment. An example of an application is for anionic analyses of aqueous infusions from building materials for determining in-salting of masonry (i.e. determining chlorides, nitrates and sulfates in masonry).

    Range of activities

    • Preparation of samples – grinding to analytical fineness, compressing into tablets
    • Qualitative analysis, quantitative analysis of various types of materials (silicates, metals, plastics, etc.)
    • Silicate analysis (mortars, concretes, building materials)

    – determining the mixing ratio
    – determining the type of binder
    – investigations of causes of failures (efflorescence, corrosion, etc.)

    • Identifying organic and inorganic substances in building materials
    • Determining chlorides in building materials (reinforcement corrosion)
    • Determining dampness of masonry
    • Determining in-salting of masonry (chlorides, sulfates, nitrates)

    Responsible person

    Ing. Daniel Dobiáš, Ph.D.

    phone: + 420 224 353 515 (13,16)

    e-mail: daniel.dobias@cvut.cz

    KPK400 U experimental climatic chamber

    The climatic chamber is used for research and development, and also in industry for quality control, climate technology tests, creating a standard testing climate according to international testing standards, research on the impact of temperature and moisture on building materials and industrial products, and impacts on biological processes under stressing temperature conditions, etc.

    Main changeable parameters of the chamber environment:

    1. Adjustable temperature in the range from -40°C to +100°C in an ambient temperature of 23°C.
    2. Adjustable relative humidity of the environment in the range from 10% to 85% in a temperature range between +20°C and +80°C.
    3. Simulation of solar radiation – Osram radiator 1200W/GS HMI.
    4. Simulation of UV radiation – built-in Osram/Radium radiator controlled by the programmed function of the thermal regulator. The radon intensity is 1000 W/m2, controlled by the programmed function of the thermal regulator.
    5. Simulation of rain (watering) by a jet, with a controlled amount of water entering the jet by a programmed regulator through the programmed function of the moisture regulator.

    The volume of the interior space of the testing chamber is approximately 390 liters (700 mm x 1500 mm x 370 mm). The climatic-technological chamber is regulated by the Eurotherm 2408 program regulator, with 4 programs and 16 segments, with the possibility of 999 repetitions in the temperature and moisture loop. This provides high accuracy of the parameters in the testing space, simple servicing and a long lifetime. The device can also be operated using the /NET / RJ 85 Ethernet converter for network communication. The required parameters of the environment and the combination cycles are programmed by the Eurotherm i-tools program, with a function documenting temperature and moisture, controlled radiation and watering.

    Name Position Email Phone
    Ing. Lukáš Balík, Ph.D. Head of department lukas.balik@cvut.cz +420 224 353 509
    doc. Ing. Tomáš Klečka, CSc. tomas.klecka@cvut.cz +420 224 353 520
    Ing. Daniel Dobiáš, Ph.D. Laboratory of chemistry daniel.dobias@cvut.cz +420 224 353 515 +420 224 335 516 +420 776 201 948
    Ing. Radka Pernicová, Ph.D. radka.pernicova@cvut.cz +420 224 353 513
    Ing. Vítězslav Vacek, CSc. vitezslav.vacek@cvut.cz +420 224 353 848
    Ing. Michaela Kostelecká, Ph.D. Laboratory of microscopy michaela.kostelecka@cvut.cz +420 224 353 522 +420 224 353 344
    Ing. Petr Pokorný, Ph.D. petr.pokorny@cvut.cz +420 224 353 513
    Ing. arch. Mgr. Klára Nedvědová klara.nedvedova@cvut.cz +420 224 353 574
    Ing. Lucie Kudrnáčová Doctoral student lucie.kudrnacova@cvut.cz +420 224 353 518
    Ing. Bc. Šárka Nenadálová Doctoral student sarka.nenadalova@cvut.cz +420 224 353 547
    Ing. Jan Šesták Doctoral student jan.sestak@cvut.cz +420 224 353 856