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RISS 인기검색어
- 검색키워드
- 저자 : Aliakbar Sayadi (검색결과 2 건)
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Ultra-lightweight Concrete Containing Expanded Poly-lactic Acid as Lightweight Aggregate
Aliakbar Sayadi,Thomas R. Neitzert,G. Charles Clifton,한민철,Karnika De Silva 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.10
The environmental impact of using petroleum products has become a serious issue nowadays. This paper is about the possibility of producing ultra-lightweight concrete by using bio-polymer aggregate as a replacement for petroleum polymer. Expanded poly-lactic acid (EPLA) and Expanded Vermiculite (EV) are used as aggregate in producing biopolymer concrete. In total, five concrete mixtures are designed with varying EPLA and EV contents. The cement content and effective water-cement ratio are kept constant. The EV aggregate was replaced with EPLA aggregate in the ratio of 20%, 40%, 60% and 80%. Three types of curing conditions were used. The mechanical properties, thermal properties, electrical properties of biopolymer concrete were assessed and analysed. The microstructure of concrete was assessed after 28-days and one year. It was found that the properties of EPLA concrete are mainly influenced by the volume of EPLA and curing conditions. The chemical reactivity of EPLA significantly changes the hydration products of concrete and causes concrete carbonation as well as the conversion of hydration products to more calcium carbonate. However, at the long-term investigation (after a year) the more C-S-H gel was found. Furthermore, EPLA aggregates shrunk and lost their strength in the alkaline environment of cement.
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Investigation on Bond Stress-slip Behavior of Concrete Containing Poly-lactic Acid Aggregate
Aliakbar Sayadi,Thomas R. Neitzert,G. Charles Clifton 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.12
The performance of Composites Structural Assemblies (CSAs) depends on the bond strength of the embedded components, namely composite panels and infill materials. A new type of eco-friendly ultra-lightweight concrete with Expanded Poly-Lactic Acid (EPLA) was prepared to assess the possibility of using biopolymer concrete as a replacement for expanded polystyrene (EPS) lightweight concrete. The bond properties of EPLA and EPS concrete for the parameters compressive strength, strip locking patterns, as well as elastic and inelastic interlocking areas were assessed. The results indicate that the application of biopolymers significantly changed the mechanical and bond properties of concrete. The chemical reactivity of EPLA and its degradation in the alkaline environment of cement causes bond failure at the interfacial transition zone of the aggregate-paste. Two different failure modes consisting of splitting cracks and pullout failure were observed. A bond stress-slip model for EPS and EPLA concrete was found to give a reasonable estimation of experimental results of bond-slip behaviour. Also, a new method is proposed to estimate the elastic and inelastic length of embedded components in ultra-lightweight concrete.
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