Search results for: Halina Garbalińska

Items from 1 to 16 out of 16 results

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The influence of measurement conditions on the determined values of thermal parameters of different types of concrete

Halina Garbalińska, Małgorzata Matys

Archives of Civil Engineering > 2024 > Vol. 70, nr 2 > 493--511

In recent years, great emphasis has been placed on the introduction of energy-saving solutions to the construction sector. Building envelopes made of concrete with a specially selected composition give great opportunities in this regard. As part of a wide-ranging experiment, the authors undertook to diagnose how much thermal conductivity, volumetric specific heat and thermal diffusivity can be improved...

article

Badanie współczynnika sorpcji kapilarnej betonów komórkowych klas gęstości 400, 500, 600 i 700

Halina Garbalińska, Agnieszka Kosmaczewska-Możejko

Builder > 2020 > R.24, nr 6 > 16--18

W artykule przedstawiono wyniki badań podciągania kapilarnego, które przeprowadzono na próbkach betonu komórkowego czterech klas gęstości: 400, 500, 600 oraz 700 pochodzących z tej samej wytwórni. Największą dynamiką procesu podciągania kapilarnego charakteryzowały się próbki betonu komórkowego klasy gęstości 400. Relacje między średnimi wartościami współczynników sorpcji A wyglądały następująco:...

article

The Influence of Silica Fume on the Mechanical and Thermal Parameters of Portland Cement Concretes

Jarosław Strzałkowski, Halina Garbalińska

Journal of Ecological Engineering > 2019 > Vol. 20, nr 9 > 95--102

The influence of the silica fume (SF) addition on the basic mechanical and thermal parameters of cement concrete was presented in this paper. Numerous studies show that the specific properties of silica fume allow producing concretes with increased strength and durability properties. However, the results of the authors' own studies demonstrated that under specific circumstances, the SF addition can...

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Wpływ domieszki napowietrzającej na podciąganie kapilarne w elementach betonowych

Halina Garbalińska, Monika Olejnik

Inżynieria i Budownictwo > 2019 > R. 75, nr 5 > 203--206

Przeanalizowano wpływ domieszki napowietrzającej na tempo wnikania wody w głąb elementów betonowych. Opisano badania podciągania kapilarnego na próbkach nienapowietrzonych oraz napowietrzonych domieszką dozowaną w ilości 0,8; 1,1; 1,4% masy cementu. Wyznaczono współczynniki sorpcji kapilarnej, będące miarą odporności na penetrację wody poszczególnych kompozytów i ich potencjalnej trwałości.

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Badanie wpływu domieszki napowietrzającej na przewodność cieplną betonu

Halina Garbalińska, Małgorzata Matys

Inżynieria i Budownictwo > 2019 > R. 75, nr 5 > 207--209

Badano przewodność cieplną betonów bez domieszki i z domieszką napowietrzającą dozowaną w ilości 0; 0,8; 1,1; 1,4% masy cementu. Betony różniły się rodzajem zastosowanego kruszywa: kamiennego, keramzytowego i popiołoporytowego. Stwierdzono, że w celu poprawy właściwości cieplnych betonu, z którego ma być wykonana przegroda, należy zastosować odpowiednio dobrane kruszywo lekkie oraz dodatkowo wprowadzić...

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Przewodność cieplna betonu komórkowego różnych klas gęstości wyznaczana w różnym stanie zawilgocenia

Halina Garbalińska, Linda Cederholm

Materiały Budowlane > 2019 > nr 1 > 58--61

Artykuł prezentuje badania współczynników przewodzenia ciepła betonów komórkowych czterech klas gęstości 400, 500, 600 i 700, pochodzących z jednej wytwórni. W badaniach zasymulowano sytuację, w jakiej mogą znaleźć się ściany budynku narażone na działanie wody, np. powodziowej. Woda rozprzestrzenia się na grubości przegrody wykonanej z poszczególnych betonów w różnym tempie. W każdym przypadku dochodzi...

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Experimentelle Ermittlung der Desorptionsisothermen von Porenbeton unterschiedlicher Dichte mit der Standardmethode SSS und mit der DVS‐Technik

Halina Garbalińska, Magdalena Bochenek

Bauphysik > 39 > 3 > 191 - 196

In dem Artikel wird die Bewertung von zwei Untersuchungsmethoden zur Ermittlung der Desorptionsisothermen – der Standardmethode SSS (Saturated Salt Solution) sowie der DVS‐Technik (Dynamic Vapor Sorption) – vorgestellt. Das Problem der Kompatibilität beider Methoden wird am Beispiel von Porenbeton der folgenden vier Rohdichteklassen getestet: 400, 500, 600, 700 kg/m³. Die erzielten Ergebnisse aus...

article

Assessment of suitability of some chosen functions for describing of sorption isotherms in building materials

Agata Stolarska, Halina Garbalińska

Heat and Mass Transfer > 2017 > 53 > 5 > 1603-1617

This paper presents results of tests and studies conducted on six common building materials, used for constructing and finishing of external walls. These included: ceramic brick, silicate brick, autoclaved aerated concrete, cement mortar, cement–lime mortar and cement mortar modified with polypropylene fibers. Each of these materials is distinguished by the other structure of porousness, affecting...

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Comparative analysis of the dynamic vapor sorption (DVS) technique and the traditional method for sorption isotherms determination — Exemplified at autoclaved aerated concrete samples of four density classes

Halina Garbalińska, Magdalena Bochenek, Winfried Malorny, Julia von Werder

Cement and Concrete Research > 2017 > 91 > C > 97-105

The paper assesses two research techniques for the determination of moisture sorption isotherms. On the one hand, in the time and labor-intensive traditional method the relative humidities are set in desiccators or climatic chambers by saturated water solutions of properly selected salts. On the other hand, the automated dynamic vapor sorption technique (DVS) is based on a humidity generating device...

article

Airtightness of the large panel buildings before and after thermal modernization

Halina Garbalińska, Magdalena Bochenek

Czasopismo Techniczne > -

In modern construction there appear two parallel independent trends. On the one hand, large emphasis is put on raising durability of construction works implemented through the selection of appropriate materials with parameters tailored to the specific conditions occurring during the operation of the building. On the other hand, great importance is attributed to the problem of energy-efficient building...

article

Microstructure modification of cement mortars: Effect on capillarity and frost-resistance

Halina Garbalińska, Agata Wygocka

Construction and Building Materials > 2014 > 51 > Complete > 258-266

The paper presents results of tests on capillarity, frost-resistance and micro-structural parameters of four cement mortars. Basic cement mortar, which was the reference recipe I, was modified “option by option”, becoming gradually recipes II, III and IV. In recipe II, a superplasticizer was used, causing a noticeable reduction of the w/c ratio. In recipe III, silica fume was applied. Whereas recipe...

article

Moisture diffusivity in mortars of different water–cement ratios and in narrow ranges of air humidity changes

Halina Garbalińska, Stefan J. Kowalski, Maciej Staszak

International Journal of Heat and Mass Transfer > 2013 > 56 > 1-2 > 212-222

The aim of this paper is to assess moisture diffusivity in a group of cement-based mortars of different water–cement ratios by different moisture contents. Five levels of moisture content equivalent to five narrow ranges of contiguous air humidity changes were considered. The effective (average) diffusion coefficients were estimated for these five moisture levels and the experiments covered mortars...

article

Linear and non-linear analysis of desorption processes in cement mortar

Halina Garbalińska, Stefan J. Kowalski, Maciej Staszak

Cement and Concrete Research > 2010 > 40 > 5 > 752-762

Based on the gathered experimental data concerning adsorption/desorption processes in cement mortar, it has been stated that the rate of these processes changes in time even if they proceed in stable conditions. In this paper an attempt is made to describe such processes by applying linear and non-linear diffusion theories for comparison. The main aim of these studies is to determine the diffusion...

article

Moisture Transfer Between Unsaturated Cement Mortar and Ambient Air

Halina Garbalińska, Stefan J. Kowalski, Maciej Staszak

Transport in Porous Media > 2010 > 85 > 1 > 79-96

The objective of this article is to provide a description of moisture transport in building materials by application of a non-linear diffusion model, in which the effective coefficient of diffusion D _eff, being a function of moisture content, is implemented. This article proposes the method of determination of this coefficient through correlation of the theoretical desorption isotherms with the experimental...

article

Application of √t-type, logarithmic and half-time methods in desorptive measurements of diffusivity in narrow humidity ranges

Halina Garbalińska

Cement and Concrete Research > 2006 > 36 > 7 > 1294-1303

This paper concerns the use of non-stationary desorptive measurement techniques for defining the mass diffusivity of cement based materials. Three different procedures are presented: √t-type calculation; logarithmic; and half-time procedures. Cement mortars of different water to cement ratios (w/c), equal to 0.50, 0.65 and 0.80 were selected as the model environment for testing the usability of the...

article

Measurement of the mass diffusivity in cement mortar: use of initial rates of water absorption

Halina Garbalińska

International Journal of Heat and Mass Transfer > 2002 > 45 > 6 > 1353-1357

This paper presents a method of defining mass diffusivity D _m of a porous material, based on non-stationary processes of moisture absorption. The results of testing absorption in 15 cycles, Is-XVs, are presented. The experiment covered series of cement mortars of different water-cement ratio, (w/c=0.50,0.65,0.80), and was carried out at three values of temperatures (T=20,35,50 ^o C),...

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