Investigation of the carbon dioxide distribution in cement bound wood samples using the radioisotope tracer technique |
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| Affiliation: | 1. Atomic Energy Organization of Iran, Nuclear Research Center, P.O. Box 11365-8486, Tehran, Iran;2. Institute of Isotopes of the Hungarian Academy of Sciences, Hungary;1. University of Belgrade, Institute of Chemistry, Technology and Metallurgy, 4 Karnegijeva St, 11000 Belgrade, Serbia;2. University of Belgrade, Technical Faculty in Bor, 12 Vojske Jugoslavije, 19210 Bor, Serbia;3. University of Belgrade, Faculty of Technology and Metallurgy, 4 Karnegijeva St, 11000 Belgrade, Serbia;1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China;2. Key Laboratory for Ecological Utilization of Multi-Metal Intergrown Ores, Ministry of Education, Northeastern University, Shenyang 110004, Liaoning, China;1. Center of Investigation in Engineering and Applied Sciences of the Autonomous University of the State of Morelos (CIICAp-UAEMor), Av. Universidad, 1001 Cuernavaca, Mexico;2. Research Center for Marine Geophysics, Moscow Institute of Physics and Technology, Nauchny per. 4, Dolgoprudny, Region of Moscow 141701, Russian Federation;3. National Research Nuclear University "MIFI", Kashirskoe road 31, Moscow 115409, Russian Federation |
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| Abstract: | Cement bound wood bricks are widely used as building element for light construction buildings. Static characteristics of bricks can be considerably improved by treating the raw mixture of cement-wood-water with carbon dioxide during the bonding process. Distribution of the CO2 among components and within the components is an important factor of the quality. Radioisotope tracer technique (RTT) was used for determining CO2 uptake and distribution. Concentration of 14C-labelled carbon dioxide was measured by β-scintillation and liquid scintillation techniques and distribution of the CO2 in the samples was visualized by autoradiography. RTT is more sensitive than the traditional analytical methods and is selective for the labelled CO2 excluding the CO2 present in the atmosphere.The physically bound CO2 was determined after physical treatment (grinding and heating) of the samples. 79% of the CO2 was bound physically. The chemically bound CO2 was determined after a series of chemical treatments of the samples. The CO2 bound in carbonate form was released from the samples by HCL and absorbed in KOH solution. 99.57% of the rest (CO2 remained after physical treatment) was found in the carbonates. The CO2 bound in the wood was determined by releasing the gas from the samples by H2SO4 and its rate was found to be 0.43%. No radioactivity was found in the silicates which remained after chemical treatments.As main parameters of the production technology, effect of the composition, treating time and CO2 pressure on the CO2 uptake was investigated by measuring some points of these relationships. |
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