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Engineering Characteristics of Extruded Panels Manufactured Using Low Energy Curing (LEC) Binder
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/342486
In the cement industry, a large amount of CO2 is emitted from the first production step, and moreover the most of secondary products go through a variety of curing processes in which fossil fuels are used, causing additional CO2 emissions. Thus there is need for developing technology so that the secondary cement products are to be processed with no or less frequent curing in the manufacturing stage, helping not only reduce CO2 emissions but also improve the economical efficiency. Thus, this study seeks to make a comparative analysis of the engineering characteristics of extruded panels which are manufactured using CSA, calcined kaolins and CAMC inorganic binder, and those of traditional extruded cement panels, and then to use the results as basic data for developing LEC extruded panels. The experiment results showed that unit weight and density of extruded panels were similar to those of the traditional mix of ordinary Portland cement, and that the ratios of the former’s water content and water absorption were 2~3% higher than those of the latter. On a material age basis of 28 days, the compressive strength was shown to be about 4.5 N/mm² more with 64.6 N/mm² for the 35 mm thickness, and 24.9 N/mm² more with 84.2 N/mm² for thr 50mm thickness, while the flexural strength was shown to be 2.4 N/mm² less with 14.1 N/mm² for the 35 mm thickness and 1 N/mm² less with 13.9 N/mm² for the 50 mm thickness compared to the traditional mix. These conflicting results in the cases of the compressive and flexural strength are though to have been due to the fact that the LEC binder had caused the greater volume expansion of the hydration products resulting from the hydration of the binder under the closely-knit structures thanks to the vacuum extrusion, necessitating future observation of the length changes and the fine structure. In addition, there were some cases where the 35 mm thickness had 1.0 N/mm² more than the 50mm thickness depending on the thickness of the panel. This is thought to be due to the difference in the hydration ratios incurred by the different caloric values per unit area depending on the thickness of the panel when going through a short period of curing process.
