Andrzej Garbacz

Andrzej Garbacz
Warsaw University of Technology · Faculty of Civil Engineering

Ph.D., D.Sc.

About

104
Publications
21,139
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
1,308
Citations

Publications

Publications (104)
Article
Fire-resistance testing procedures for glazed partitions used in Europe determine the minimum dimensions of the test items (2.8× 3.0 m, width × height in the furnace opening lumen). Tests on minimum-sized items enable the evaluation of the fire resistance of slightly larger components. Nonetheless, they do not address the real problem of using fire...
Article
Full-text available
This paper presents fiber-reinforced polymer composites which were modified by fibers hybridization as well as matrix nanomodifiaction with nanosilica. The article analyzed the nanosilica matrix modification and basalt-carbon hybridization’s effect on key properties of composites use as the main reinforcement in concrete structures. The comparative...
Article
Full-text available
A combination of multiple nondestructive testing (NDT) methods speeds up the assessment of concrete and increases the precision. This is why the UIR-Scanner was developed at Warsaw University of Technology. The scanner uses an Impact-Echo (IE) method with a unique arrangement of multiple transducers. This paper presents the development of the IE mo...
Article
The actual class of fire resistance of glazed partitions can only be determined according to a test, which meets the normative requirements. The test standards in this field determine the minimum dimensions of the test specimens (2800 × 3000 mm, width × height, in the clear opening of the furnace), on which the test should be carried out. The testi...
Article
Full-text available
Znajomość grubości warstw nawierzchni drogowych jest niezbędna do prawidłowego oszacowania aktualnej nośności nawierzchni i zaplanowania zabiegów remontowych oraz skontrolowania grubości nowej, układanej konstrukcji. Do oznaczania grubości warstw nawierzchni drogowych najczęściej stosuje się metodę niszczącą polegającą na wykonywaniu odwiertów (np....
Article
Full-text available
One of the main concerns that limit the widespread use of Fibre-Reinforced Polymers (FRP) bars as internal reinforcement for reinforced concrete (RC) structures is their relatively unexplored response to elevated temperatures. The behaviour of FRP reinforcement at elevated temperature as well as their post-fire behaviour can be different from conve...
Article
Full-text available
This paper presents research dealing with the evaluation of the efficiency of concrete repairs with polymer-cement mortars made at low temperatures with two types of cement and modified by copolymer acrylic-styrene. The low temperature used for the tests, of about 8 °C, is representative for Central Europe, and was established based on the analysis...
Article
Full-text available
The article discusses one of the methods of dielectric constant determination in a continuous way, which is the determination of its value based on the amplitude of the wave reflected from the surface. Based on tests performed on model asphalt slabs, it was presented how the value of the dielectric constant changes depending on the atmospheric cond...
Article
Full-text available
The aim of this work was to study the influence of the type of activator on the formulation of modified fly ash based geopolymer mortars. Geopolymer and alkali-activated materials (AAM) were made from fly ashes derived from coal and biomass combustion in thermal power plants. Basic activators (NaOH, CaO, and Na2SiO3) were mixed with fly ashes in or...
Article
Full-text available
The paper presents a study on the properties of New Generation Shielding Concrete (NGS-Concrete) modified by materials containing fast neutron moderators and thermal neutron absorbers. The reference ordinary concrete (OC) was modified by the change of the coarse aggregate from crushed granite to magnetite one and cement from CEM III 42.5N to CEM I...
Article
Full-text available
In this paper an analysis of the influence of polymer modification on the microstructure, shielding properties against neutrons, and compressive strength of heavy-weight magnetite concrete is carried out. The modifications involve the addition of acrylic or epoxy dispersions as well as micro- or/and macrofibers. A computer image analysis method is...
Article
Full-text available
One of the most common causes of the deterioration of concrete structures is the corrosion of steel reinforcement. Reinforcement made from fiber reinforced polymers (FRP) is considered to be an attractive substitution for traditional reinforcement. The most popular FRP reinforcing bars are made of glass fibers. Basalt fiber reinforced polymer (BFRP...
Article
Full-text available
The behaviour of Fibre-Reinforced Polymer (FRP) bars and Fibre-Reinforced Polymer reinforced concrete (FRP-RC) members under fire exposure is quite different from conventional means. This may be attributed to the complex behaviour of the bars when they are subjected to fire, as well as to the complexity of fire test procedures. The thermomechanical...
Article
Full-text available
The paper describes the recent developments of Hybrid Fibre-Reinforced Polymer (HFRP) and nano-Hybrid Fibre-Reinforced Polymer (nHFRP) bars. Hybridization of less expensive basalt fibres with carbon fibres leads to more sustainable alternative to Basalt-FRP (BFRP) bars and more economically-efficient alternative to Carbon-FRP (CFRP) bars. The New-D...
Article
Full-text available
The paper describes a new method for assessing the impact of increasing static strength due to cyclic loading on the fatigue life of various materials and provides a mathematical description. Experimental results available in the literature were used. A generalized concept of unit fatigue damage was used to produce a simple hypothesis defining fati...
Article
Full-text available
The article presents the results of the research on thermal actions on the materials occurring in the cross section along the depth of the bridge deck and bituminous pavement during its construction. The impulse to curried out the research was the need to explain the causes of the blistering of bituminous waterproofing membranes and asphalt pavemen...
Conference Paper
Full-text available
Zastosowanie metody georadarowej do wykrywania nieszczelności obiektów wykonanych w technologii "białej wanny": studium przypadku Application of the ground penetrating radar method to leak detection of objects made in the "white box" technology: a case study Streszczenie Technologia "białej wanny" pozwala na wykonanie szczelnej konstrukcji. Jednak...
Poster
Full-text available
Jedną z metod, umożliwiających nieniszczącą lokalizację miejsc nieszczelności, bez konieczności wyłączania obiektu z użytkowania, jest metoda georadarowa (GPR). W artykule przedstawiono próby praktycznego wykorzystania tej metody do lokalizacji miejsc przecieków w płycie dennej i ścianach wiaduktu kolejowego oraz podłogi w płycie dennej garażu podz...
Conference Paper
Full-text available
In the paper a water content effect in various states on the variability of the electromagnetic waves parameters is discussed. This variation can affect accuracy and repeatability of asphalt and concrete pavement thickness estimation with GPR method. In case of asphalt pavements, tests were carried out using the air-coupled 1.0 GHz antenna and incl...
Chapter
The principal objective of this study is to elaborate the reliable properties for hybrid fiber-reinforced polymer (HFRP) bars, which will have the potential to be considered as a competitive alternative to conventional reinforcement for concrete structures. Understanding mechanical performance of HFRP bars with various types of hybridization will a...
Chapter
The repair of concrete requests specific preparation operations needed for guaranteeing compatibility between substrate and new materials as well as the development of adhesion properties. These specification guidelines contain design and construction recommendations for surface preparation of concrete for repair and overlay. The paper summarizes c...
Article
Full-text available
The main factors determining the choice of fiber-reinforced polymer (FRP) materials are the intended use of the designed structure and the environmental conditions in which it will be located. Currently, the FRP-based materials have a variety of applications in the construction industry, from the secondary structural elements of buildings, to a com...
Article
Full-text available
It is common occurrence that on-site workers misunderstand various detailing aspects of the provided documentation. Some of them can be unclear and should be discussed again due to construction related processes. In order to deal with this issue the application for mobile devices was proposed. The developed application allows to visualize two-dimen...
Article
Full-text available
To repair reinforced concrete infrastructures requests specific preparation operations needed for guaranteeing compatibility between substrate and new materials as well as the development of adhesion properties. These guidelines contain design and construction recommendations for surface preparation of concrete for repair and overlay. The paper ill...
Book
Full-text available
The monograph contains a list of technical requirements for the construction of concrete structures in nuclear power facilities. In addition, the organizational guidelines and recommendations in the field of quality assurance and system control are included . Those regulations may be posed to Polish companies whishing to offer its services for glob...
Article
Full-text available
In this paper, an extensive Finite-Element (FE) numerical study is carried out on a glass framing with point mechanical connectors. The models have been calibrated based on literature studies and field research. The simulations have been performed in order to assess the mechanical behavior of the examined glass-aluminum panels. In frame-support gla...
Poster
Full-text available
Falogram wskazujący na obecność zawilgocenia pod płytą fundamentową. Falogram trudny do jednoznacznej oceny. Fioletowe, pionowe refleksy świadczą o istnieniu spękań w płycie fundamentowej. Na falogramie nie występują refleksy odpowiadające spękaniom płyty fundamentowej. Do najbardziej destrukcyjnych czynników wpływających na trwałość elementów żelb...
Conference Paper
Full-text available
Trwałość konstrukcji żelbetowych w istotny sposób zależy od środowiska w jakim pracują. Do najbardziej destrukcyjnych czynników wpływających na trwałość elementów żelbetowych, szczególnie w nieogrzewanych parkingach podziemnych, należy obecność wody oraz jonów chlorkowych, która niejednokrotnie przechodzi cykle zamrażania i rozmrażania. W podziemne...
Article
According to Concrete Repair Manual as well as ACI 562-16 and European EN 1504-10 standards, a bond strength as a measure of adhesion is one the main feature of repair system necessary to be assessed. The most common laboratory and engineering method for bond strength evaluation is pull-off test. This is however a semi-destructive method that needs...
Article
Full-text available
This paper introduces both an analytical and numerical study that investigates the mechanical performance of recently developing HFRP bars, which were created by substitution of the part of basalt fibres BFRP by the part of carbon fibres CFRP. In this aspect the term “substitution” might be understood as modification of BFRP bars, where part of bas...
Article
Full-text available
This paper introduces numerical investigation on mechanical performance of a concrete beam reinforced with Fibre Reinforced Polymer (FRP) bars, which can be competitive alternative to steel bars for enhancing concrete structures. The objective of this work is being identified as elaborating of reliable numerical model for predicting strength capaci...
Chapter
Full-text available
An adhesion in repair system is one of the most important factors that affect the repair efficiency. The elabora-tion of reliable nondestructive method for an adhesion mapping is one of the most important tasks. A majority of NDT methods mentioned in EN 1504-10 and ACI Concrete Repair Manual for assessment of concrete structures are based on propag...
Article
Full-text available
The paper presents the results of an experimental program intended to assess the potential of sanitary ceramic waste utilization as aggregates in cement-based mortars. Their influence was evaluated with respect to workability (consistency, plasticity, pores volume), mechanical properties (compressive and flexural strength) and freeze-thaw resistanc...
Article
Full-text available
Zgodnie z EN 12504-4 oznaczenie prędkości fali ultradźwiękowej może być wykorzystywane w szeregu zastosowań, w tym w szczególności do szacowania wytrzymałości. Możliwość jej zastosowania do oceny właściwości fizycznych i mechanicznych uwarunkowana jest dysponowaniem odpowiednich związków korelacyjnych. Wyznacza się je na podstawie analizy regresyjn...
Article
The construction industry is responsible for high energy and raw materials consumption. Thus, it is important to minimize the high energy consumption by taking advantage of renewable energy sources and reusing industrial waste, decreasing the extraction of natural materials. The mortars with incorporation of phase change materials (PCM) have the ab...
Article
One of the most common causes of damage to concrete structures is the corrosion of the reinforcement. Reinforcement made from Fiber Reinforced Polymers (FRP) is considered as an attractive substitution of traditional steel reinforcement. A different technical characteristic of fiber reinforced polymer makes designing structures with FRP reinforceme...
Article
Adhesion in this system is one of the most important factors that affect the reliability and durability of repair. According to the many standards and guidelines, e.g. new European Standard EN 1504-10 and ACI Concrete Repair Manual, a pull-off test is recommended for assessment of a bond quality in repair systems. The use of pull-off test, due to i...
Article
Full-text available
Adhesion in repair systems is one of the most important factors affecting their durability. Elaboration of a reliable nondestructive test method to perform an adhesion mapping is one of the most important tasks. A majority of NDT methods applicable for the assessment of concrete structures are based on the propagation of various types of stress wav...
Article
The industry of construction is responsible for the high consumption of raw materials, energy and waste production. As such, it becomes imperative to develop and study new constructive solutions with greater sustainable value. The mortars with incorporation of phase change materials (PCM) have the ability to regulate the temperature inside building...
Article
In a society with a high growth rate and increased standards of comfort arises the need to minimize the currently high energy consumption by taking advantage of renewable energy sources. The mortars with incorporation of phase change materials (PCM) have the ability to regulate the temperature inside buildings, contributing to the thermal comfort a...
Article
The successful application of a concrete repair system is often evaluated through pulloff testing. For such in-place quality control (QC) testing, the inherent risk of misalignment might affect the recorded value and eventually make a difference in the acceptance of the work. The issue of eccentricity in pulloff testing has been ignored in field pr...
Book
Applying any material to an existing concrete surface intrinsically entails the development of a bond. Considering the ever increasing importance of concrete repair and protection, which imply the creation of an interface between two materials, an improved knowledge of concrete surface characteristics is paramount. Surface engineering, which has ev...
Article
As a good bond between the repair and the old concrete is required, the soundness of the prepared surface has to be carefully assessed. This paper presents the results of an investigation intended to assess and compare quantitatively different test methods, namely the rebound hammer and the pull-off test, to evaluate superficial mechanical integrit...
Article
Repair of any concrete structure results in formation of complex, at least two-component repair systems. Compatibility approach is treated as a basic requirement during selection of repair material. Recently, the understanding for compatibility requirements in repair systems approach has been demonstrated in many papers. The aim of this paper is an...
Article
Full-text available
Repair and strengthening of existing concrete structures are among the biggest challenges civil engineers are facing today and will have to face in the years to come. Present concerns of sustainable development emphasizing repair instead of new construction will only strengthen this trend. Concerted efforts towards improving the durability of concr...
Conference Paper
The industry of construction is responsible for the high consumption of raw materials, energy and waste production. As such, it becomes imperative to develop and study new constructive solutions with greater sustainable value. The mortars with incorporation of phase change materials (PCM) have the ability to regulate the temperature inside building...
Conference Paper
In a society with a high growth rate and increased standards of comfort arises the need to minimize the currently high energy consumption by taking advantage of renewable energy sources. The mortars with incorporation of phase change materials (PCM) have the ability to regulate the temperature inside buildings, contributing to the thermal comfort a...
Article
One of the main processes for repairing concrete structures is patch repair. Efficiency and durability of a repaired system depends on the bond between concrete substrate and repair material. By increasing the surface roughness, the surface treatment of concrete substrate can promote mechanical interlocking that is one of the basic mechanisms of ad...
Article
Most of concrete formulations actually contain mineral additives that are used as an inert filler or supplementary cementitious material (as type II addition). These materials are generally used in order to increase concrete performances both in its fresh and hardened states. The mineral additives usually improve the consistency and workability of...
Article
Full-text available
Basalt bars for concrete reinforcement called Basalt Fiber Reinforced Plastic (BFRP) is a new material, so it is necessary to identify the differences and limitations of their use in the concrete structures in relation to traditional steel reinforcement of concrete structures. The paper presents some chosen results of pilot research on the series o...
Article
The subject of this paper is the evaluation of possibility of using the plastic waste fillers as the coarse aggregate of two Concrete-Polymer Composites (C-PC): polymer-cement concrete (PCC) and polymer concrete (PC). The applied fillers were crushed high density polypropylene (HDPP) wastes remaining after grinding plastic elements used in mounting...
Chapter
Full-text available
In the research three NDT methods: indirect Ultrasonic Pulse Velocity, Impact-Echo (IE) and Ground Penetrating Radar (GPR) were used for investigation of concrete slabs with well-defined reinforcement and artificial defects. The obtained results shows the big potential of combination of UPE, IE and GPR methods for detection of wide range of defects...
Article
The objective of the paper is to analyze the effect of substrate roughness and superficial microcraking upon adhesion of repair systems using concrete surface engineering approach. The results presented in this paper have been obtained within the framework of research projects performed to develop a better understanding of the factors affecting the...
Article
Full-text available
The three non-destructive testing methods: the indirect ultrasonic pulse velocity, impact-echo and ground-penetrating radar, implemented in the scanner UIR, were used to study the concrete slabs reinforced with well-defined and artificial defects. The results confirmed the high potential of combined methods for detecting defects in concrete structu...
Article
The three non-destructive testing methods: the indirect ultrasonic pulse velocity, impact-echo and ground-penetrating radar, implemented in the scanner UIR, were used to study the concrete slabs reinforced with well-defined and artificial defects. The results confirmed the high potential of combined methods for detecting defects in concrete structu...
Conference Paper
Full-text available
Polymer concretes appear as useful materials for manufacturing precast elements as well as for repair and protection of building structures. In both cases, there is a need for quality control and diagnosis during service life as well. Therefore the development of nondestructive assessment methods is an important issue. Ultrasonic methods are among...
Conference Paper
W pracy omówiono wpływ wapniowych popiołów lotnych, ubocznych produktów fluidalnego spalania węgla, zastosowanych jako zamiennik typowych mikrowypełniaczy betonów żywicznych, na ich odporność chemiczną. Skład betonów określono wykorzystując statystyczne planowanie eksperymentu, gdzie jedną ze zmiennych wejściowych był stopień substytucji tradycyjne...
Article
Appropriate surface saturation level is essential for the durability of the repaired structure. The repair material is often blamed for “not sticking”, although the general source of the trouble lies with the substrate surface conditioning. An extensive research project has been undertaken to develop specifications and performance criteria for surf...
Conference Paper
Full-text available
In the paper the effect of silica microfiller replacement by calcium fly ashes on polymer concrete mechanical properties, as well as binder hardening characteristics were investigated. This approach follows the sustainable development requirements in a building industry. Additionally, replacing components with less expensive equivalents lowers the...