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An Experimental Study on the Properties of Concrete Using the Waste Gypsum  

Kim, Nam Wook (청주대학교 토목환경공학과)
Song, In (전북대학교 토목공학과)
Park, Rae Seon (한국도로공사)
Bae, Ju Seong (전북대학교 토목공학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.11, no.2, 2007 , pp. 69-76 More about this Journal
Abstract
As amount of waste matter rapidly increases with fast growth of cities and industry, how to dispose them has arisen as an important problem. Current policy of the government on disposal of waste is repressing generation of waste itself and in case of already generated waste, resource cycle waste management system that recycles waste after proper environmental process is getting established. Therefore recycling of waste and industrial by-products is rising hugely. One of largely wasted matters is waste gypsum, which was categorized as designated waste but changed to general since 1994. Due to disposal cost and lack of impurities removal technology, recycling of it was quite low. However, as impurities removal technology using semi-dried desulfurization process is developed lately, study on recycling of waste gypsum is going on lively. This study examines possibility of utilizing waste gypsum as alternative for concrete cement and analyzed attributes of waste gypsum before and after ball mill process to find out proper alternation ratio, and conducted strength and property tests on concrete subject whose percentage of cement use is substituted with 0, 5.0, 7.5, 10.0 and 12.5% of waste gypsum.
Keywords
Waste gypsum; Ball-milling; Mechanical properties; Reasonable substitutive rate;
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