Salt binding parameters of ceramic bricks

• Autorzy: Pavlík Z. , Pavlíková M. , Černý R.

Warianty tytułu

CS

Akumulační parametry solí pálených cihel

• Języki publikacji: EN

Abstrakty

EN

Durability and service life problems of building materials and structures induced by salt attacks are becoming very actual topic for researchers and building practice. The main reason is certainly the expenses that have to be expended to the reconstruction of salt damaged structures. Although in Central European countries there is not problem with sea aerosols containing high amount of NaCl, many salt sources can be identified, e.g. underground soils contaminated by salts, salts from the winter road and pavements maintainance, and acid forming gases. For prediction of behaviour of materials exposed to the salt attack, computational modelling is often used. In modelling salt transport (or, more precisely, ion transport) in a porous medium, the two basic phases, namely the free phase and the bound phase, should be distinguished. Therefore, salt (or ion) binding isotherms have to be determined, which express the equilibrium relation between the amount of free ions in the solution and the amount of bound ions (by both physisorption and chemisorption) on the pore walls in the porous medium. In this work, experimental assessment of ion binding isotherms of two different types of ceramic bricks is presented.

CS

Práce popisuje experimentální stanovení vazebných izoterem NaCl, KNO3 a Na2SO4 pro dva typy pálených keramických cihel. Experiment je proveden na principu adsorpce iontů solí z roztoku na základě modifikované metody Tanga a Nilssona. Pro měření koncentrace solí ve výluhu je využito iontově selektivních elektrod a v případě síranu sodného iontové chromatografie. Získané výsledky představují cenné informace nezbytné pro pochopení adsorpce iontů solí na stěny porézního prostoru a mohou být použity například jako vstupní data pro počítačové modelování kombinovaného transportu vlhkosti a solí.

Słowa kluczowe

EN

salt binding; ceramic brick; building materials

PL

wiązanie soli; cegła ceramiczna; materiały budowlane

• Wydawca: Komisja Inżynierii Budowlanej Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Roczniki Inżynierii Budowlanej
• Rocznik: 2007
• Tom: z. 7
• Strony: 61--64
• Opis fizyczny: Bibliogr. 4 poz., wykr.

Twórcy

autor

Pavlík Z.

• Czech Technical University, Prague

autor

Pavlíková M.

• Czech Technical University, Prague

autor

Černý R.

• Czech Technical University, Prague

Bibliografia

• [1] Barneyback R.S., Diamond, S.: Expression and analysis of pore fluids from hardened cement pastes and mortars. Cement and Concrete Research, 11, 1981, pp. 279-285.
• [2] Dhir, R.K., Jones, M.R., Ahmed, H.E.H., 1990, Determination of total and soluble chlorides in concrete. Cement and Concrete Research, 20, pp. 579-590.
• [3] Tang, L., Nilsson, L.O.: Chloride binding capacity and binding isotherms of OPC pasted and mortars. Cement and Concrete Research, 23, 1993, pp. 247-253.
• [4] Jiřičková M., Stoklasová, D., Pavlík, Z., Černý, R.: Chloride Binding in Cement Based Materials, In: Development of Experimental Methods for Evaluation of Functional Properties of Buildings. Prague: CTU, 2005, s. 18-26.