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Title |
A Physical Properties of Lightweight Foamed Concrete According to Lightweight Aggregate Types and Foaming agent Types
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Authors |
김하석(Ha-Seog Kim) ; 이세현(Sea-Hyun Lee) ; 선정수(Jung-Soo Sun) ; 김진만(Jin-Man Kim) |
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DOI |
http://dx.doi.org/10.4334/JKCI.2016.28.4.435 |
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Keywords |
floor impact noise ; heavy weight impact noise ; lightweight foamed concrete ; lightweight aggregate |
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Abstract |
In Korea, approximately 48% of all households live in apartments, which are a form of multi-unit dwellings, and this figure increases up to 58%, when row houses and multiplex houses are included. As such, majority of the population reside in multi-unit dwellings where they are exposed to the problem of floor impact noise that can cause disputes and conflicts. Accordingly, this study was conducted to manufacture a high-weight, high-stiffness foamed concrete in order to develop a technology to reduce the floor impact noise. For the purpose of deriving the optimum mixing ratio for the foamed concrete that best reduces the floor impact noise, the amounts of the foaming agent, lightweight aggregate and binder were varied accordingly. Also, the target characteristics of the concrete to be developed included density of over 0.7 t/m3, compressive strength of over 2.0 N/mm2 and thermal conductivity of under 0.19 W/mK. The results of the experiment showed that the fluidity was very excellent at over 190 mm, regardless of the type and input amount of foaming agent and lightweight aggregate. The density and compressive strength measurements showed that the target density and compressive strength were satisfied in the specimen with 50% foam mixing ratio for foamed concrete and in all of the mixtures for the lightweight aggregate foamed concrete. In addition, the thermal conductivity measurements showed that the target thermal conductivity was satisfied in all of the foamed concrete specimens, except for VS50, in the 25% replacement ratio case for Type A aggregate, and all of the mixtures for Type B aggregate.
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