• Title/Summary/Keyword: expanded polystyrene (EPS)

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A Study on the Properties of Polymer Mortar Using Waste Expanded Polystyrene as a Shrinkage-Reducing Agent (수축저감제로서 발포 폴리스티렌 폐기물을 이용한 폴리머 모르터의 기초적 성질에 관한 연구)

  • 최낙운;김완기;조영국;소승영;소양섭
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.10a
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    • pp.362-367
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    • 1998
  • The purpose of this study is to examine the influences of polystyrene content and St/UP on the setting shrinkage and strengths of polymer mortar with waste expanded polystyrene resin as a shrinkage-reducing agent, and to recommend the optimum binder formulations for product of low-shrinkage polymer mortar. In this paper, polymer mortar is prepared with waste expanded polystyrene content and St/UP, and tested for setting shrinkage, flexural and compressive strengths. From the test results, irrespective of increasing of waste expanded polystyrene resin, the strengths reduction of polymer mortar with waste expanded polystyrene(EPS) resin is not recognized. And the setting shrinkage is reduced with EPS resin content. The waste expanded polystyrene resin as a shrinkage-reducing agent can be used in the same manner as commercial polystyrene resin. In this study, we can obtain the optimum mix proportions of polymer mortar using EPS resin.

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Freshness Extension of Squash (Cucurbita moschata) Packed with Expanded Polystyrene Foam Box (Expanded Polystyrene Foam Box로 포장한 애호박의 신선도 유지 효과)

  • 박형우;박종대;이명훈
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.29 no.1
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    • pp.76-79
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    • 2000
  • The effects of packaging conditions on freshness extension of squash (Cucurbita moscata) were investigated during 7-day storage at 2$0^{\circ}C$. Weight loss of squash packed with corrugated paperboard box (control) was 5.5%, and those of LDPE (low density polyethylene, Ф0.02 mm), LDPE (Ф0.04mm) film and EPS (expanded polystyrene) box were 0.9%, 0.8%, and 1.1%, respectively. Firmness of EPS was 11% higher than that of control, chlorophill content of squash packed with EPS box was 18.9% higher, and total ascorbic acid content of squash packed with EPS box was 29.4% higher than that of control. Quality of packed squash was not different between EPS packages and LDPE packages. Decay of control was 1~2 pieces per box, but was not found in the LDPE, EPS box. Preferences in overall appearences of LDPE, EPS box was better than those of control.

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Flexural Behavior of Polymer Mortar Permanent Forms Using Methyl Methacrylate Solution of Waste Expanded Polystyrene

  • Bhutta, M. Aamer Rafique;Tsuruta, Ken;Ohama, Yoshihiko
    • International Journal of Concrete Structures and Materials
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    • v.2 no.1
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    • pp.35-39
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    • 2008
  • This experimental study examines the applicability of polymer mortar permanent forms using a methyl methacrylate (MMA) solution of waste expanded polystyrene (EPS) to develop effective recycling processes for the EPS, referring to the flexural behavior of a polymer-impregnated mortar permanent form with almost the same performance as commercial products. An MMA solution of EPS is prepared by dissolving EPS in MMA, and unreinforced and steel fiber-reinforced polymer mortars are mixed using the EPS-MMA-based solution as a liquid resin or binder. Polymer mortar permanent forms (PMPFs) using the EPS-MMA-based polymer mortars without and with steel fiber and crimped wire cloth reinforcements and steel fiber-reinforced polymer-impregnated mortar permanent form (PIMPF) are prepared on trial, and tested for flexural behavior under four-point (third-point) loading. The EPS-MMAbased PMPFs are more ductile than the PIMPF, and have a high load-bearing capacity. Consequently, they can replace PIMPF in practical applications.

Case Studies of EPS Failure and Quality Control by Site Monitoring (EPS 공법의 파괴사례 및 품질관리 개선방안)

  • 김호비;주태성;류기정;한태곤;김태경;정종권
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.401-408
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    • 2003
  • EPS(Expanded Polystyrene) has been used in a variety of applications as a solution of difficult soil conditions encountered in construction activities. Although there has been significant worldwide growth in the use of EPS as a lightweight fill material, it has a few failure cases before and after the construction. This paper described the observed failures of EPS structures up In date around the world. Also, method of quality control was proposed for site monitoring.

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Setting Behavior of Polystyrene Mortars with Elapsed Curing Time (폴리스티렌 모르타르의 양생재령에 따른 경화거동)

  • Choi Nak-Woon;Kim Han-Sang
    • Journal of the Korea Concrete Institute
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    • v.16 no.1 s.79
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    • pp.54-60
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    • 2004
  • This study deals with the setting behavior of polystyrene mortars using waste expanded polystyrene(EPS) solution-based binders. The binders for polystyrene mortars are made by mixing crosslinking agent with EPS solutions prepared by dissolving EPS in styrene. Polystyrene mortars are prepared with various EPS concentrations of EPS solutions and crosslinking agent contents, subjected to a dry curing, and tested for working life, peak exotherm temperature and 10h-length change. From the test results, He working lives of polystyrene mortars are shortened with raising EPS concentration of EPS solution and crosslinking agent content. Low-shrinkage or non-shrinkage polystyrene mortars could be obtained by adjusting EPS concentration of EPS solution and crosslinking agent content.

Setting Properties of Polystyrene Mortars (폴리스티렌 모르타르의 경화특성)

  • 최낙운;오하마요시히코;소양섭;김완영
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.05a
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    • pp.793-798
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    • 2003
  • The purpose of this study is to investigate the setting properties of polystyrene mortars using waste expanded polystyrene(EPS) solution-based binders. The binders for polystyrene mortars are made by mixing crosslinking agent with waste EPS solutions which prepared by dissolving EPS in styrene. Polystyrene mortars are prepared with various EPS concentrations of EPS solutions and crosslinking agent contents, subjected to a dry curing, and tested for working life, peak exotherm temperature and 10h-length change. From the test results, the working lives of polystyrene mortars are shortened with raising EPS concentration of EPS solution and crosslinking agent content. Low-shrinkage or non-shrinkage of polystyrene mortars should be accomplished by adjusting EPS concentration of EPS solution and crosslinking agent content.

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Subacute Oral Toxicity Evaluation of Expanded-Polystyrene-Fed Tenebrio molitor Larvae (Yellow Mealworm) Powder in Sprague-Dawley Rats

  • Choi, Eun-Young;Lee, Jae-Han;Han, So-Hee;Jung, Gi-Hwan;Han, Eun-Ji;Jeon, Su-Ji;Jung, Soo-Hyun;Park, Jong-Uk;Park, Ji-Hoon;Bae, Yoon-Ju;Park, Eun-Soo;Jung, Ji-Youn
    • Food Science of Animal Resources
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    • v.42 no.4
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    • pp.609-624
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    • 2022
  • Tenebrio molitor larvae, as known as edible insects, has advantages of being rich in protein, and has been recognized as a suitable alternate protein source for broiler and pig feed. Moreover, given their ability to biodegrade polystyrene, a major pollutant, Tenebrio molitor larvae has been proposed as an innovative solution to environmental problems. In the present study, we investigated the toxicity of Tenebrio molitor larvae powder (TMlp) ingested with expanded-polystyrene (W/ eps) through in vitro and in vivo experiments. The objective of this study was to determine whether TMlp W/ eps can be applied as livestock alternative protein source. For in vitro experiments, cytotoxicity test was performed to investigate the effects of TMlp-extract on the viability of estrogen-dependent MCF-7 cells. The possibility of estrogen response was investigated in two groups: Expanded-polystyrene-fed (W/ eps) TMlp group and without expanded-polystyrene-fed (W/o eps) TMlp group. For in vivo experiments, The male Sprague-Dawley rats were divided based on the dosage of TMlp administered and oral administration was performed to every day for 5 weeks. A toxicological assessments were performed, which included clinical signs, food consumption, body and organ weights, hematology, serum chemistry, and hematoxylin and eosin staining of liver and kidney. There were no specific adverse effect of TMlp W/ eps-related findings under the experimental conditions of this study, but further studies on both sexes and animal species differences should be investigated. In conclusion, TMlp W/ eps was considered non-toxic and observed to be applicable as an alternative protein source for livestock feed.

Experimental Study for the Impact Characteristics of Expanded EPP/EPS Foams (발포 EPP/EPS의 충격특성에 관한 실험적 연구)

  • Kim, Han-Kook;Kim, Byeoung-Jun;Jeong, Kwang-Young;Cheon, Seong S.
    • Composites Research
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    • v.26 no.6
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    • pp.343-348
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    • 2013
  • In the present study, quasi-static tests and impact tests were performed for investigating the mechanical behaviour of EPP (Expanded polypropylene) and EPS (Expanded polystyrene). Four different density cylindrical type specimens were prepared for EPP and EPS and 0.001 $s^{-1}$ and 0.1 $s^{-1}$ of strain rate conditions for quasi-static tests and 100 J, 200 J and 300 J of incident energy conditions for the instrumented impact tests were considered.

Experimental and numerical investigation of expanded polystyrene (EPS) geofoam samples under monotonic loading

  • Khalaj, Omid;Siabil, Seyed Mohammad Amin Ghotbi;Azizian, Mehran;Tafreshi, Seyed Naser Moghaddas;Masek, Bohuslav;Kepka, Miloslav;Kavalir, Tomas;Krizek, Michal;Jirkova, Hana
    • Geomechanics and Engineering
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    • v.22 no.6
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    • pp.475-488
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    • 2020
  • The recent increase in the use of Expanded Polystyrene (EPS) geofoam in construction and geotechnical projects has driven researchers to investigate its behavior, more deeply. In this paper, a series of experimental tests to investigate the stress-strain behavior and the mechanical properties of EPS blocks, under monotonic axial loading are presented. Four different densities of cylindrically shaped EPS with different dimensions are used to investigate the effects of loading rate, height and diameter, as well as the influence of the density of EPS on the stress-strain response. The results show that increasing the height of the EPS samples leads to instability of the sample and consequent lower resistance to the applied pressure. Large EPS samples show higher Young's modulus and compressive resistance due to some boundary effects. An increase in the rate of loading can increase the elastic moduli and compressive resistance of the EPS geofoam samples, which also varies depending on the density of the samples. It was also determined that the elastic modulus of EPS increases with increasing EPS density. By implementing an efficient numerical procedure, the stress-strain response of EPS geofoam samples can be reproduced with great accuracy. The numerical analysis based on the proposed method can used to evaluate the effect of different factors on the behavior of EPS geofoam.