• 제목/요약/키워드: bending and compressive strength properties

검색결과 209건 처리시간 0.025초

실리카흄 및 플라이애쉬의 치환율 변화에 따른 초고강도 콘크리트의 특성에 관한 실험적 연구 (An Experimental Study on the Properties of Ultra High Strength Concrete for Replacement of Silica Fume & Fly Ash)

  • 윤기원;조병영;한천구;반호용
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1994년도 가을 학술발표회 논문집
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    • pp.157-160
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    • 1994
  • Recently, many studies on the ultra high strength concrete are performed in our country. so, this study is aimed for analyzing the effects for replacement of silica fume and fly ash. As results, slump, slump flow and compressive strength is showed the high values in replacement silica fume. Tensile strength ratio is 1/17 and bending strength ratio is 1/6 for compressive, there are results of the test.

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중성화 처리 시점 및 양생방법에 따른 에코 콘크리트의 물리.역학적 특성 (Physical and Mechanical Properties of ECO-concrete for Neutralization Treatment Point and Curing Methods)

  • 임상혁;김영익;성찬용
    • 한국농공학회:학술대회논문집
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    • 한국농공학회 2002년도 학술발표회 발표논문집
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    • pp.193-196
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    • 2002
  • This study is performed to examine physical and mechanical properties or neutralization treatment point and curing methods of ECO-cencrete using rice straw ash. Tests for void ratio, compressive and bending strength with neutralization treatment point and curing methods are performed. The test result shows that the void ratio is decreased with increasing content of rice straw ash. But, the compressive and bending strength is increased with increasing content of rice straw ash. The greatest strength is appeared when neutralization is treated at the curing age of 6 days.

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$MnO_2$를 첨가한 PZT 세라믹스의 압전열화 및 기계적 특성 (The Piezoelectric Degradation and Mechanical Properties in PZT Ceramics with $MnO_2$ Addition)

  • 김종범;최성룡;윤여범;태원필;김송희
    • 한국세라믹학회지
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    • 제34권3호
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    • pp.257-264
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    • 1997
  • MPB조성영역에 MnO2를 첨가한 압전체를 제조하여 분극처리후에 반복압축응력을 부여함에 따른 압전열화 현상을 조사하고 분극처리 전후의 굽힘강도의 변화 및 파괴특성을 연구하였다. MnO2를 0.25wt.% 첨가한 시편에서 가장 적은 열화현상이 일어났다. 굽힘강도는 분극처리 후 하중방향에 평행한 방향으로 분극처리한 시편이 분극처리 전보다 높은 강도를 나타내었고, 수직한 방향으로 분극처리한 시편은 낮은 값을 나타내었다. 이는 분극처리시 발생하는 전계방향으로 압축잔류응력, 직각방향으로 인장잔류응력 때문인 것으로 사료된다.

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폐칼슘 재료를 채움재로 사용한 모르타르의 휨·압축강도에 관한 연구 (A Study on the Bending and Compressive Strength of Mortar using Waste Calcium Material as a Filling Material)

  • 김해나;김봉주;정의인;서은석;홍상훈;신동욱
    • 한국건축시공학회:학술대회논문집
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    • 한국건축시공학회 2020년도 봄 학술논문 발표대회
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    • pp.64-65
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    • 2020
  • Oyster shells are difficult to grind, while oyster shell powders have coarse and coarse grains, whereas egg shell powder, the same high calcium material, has small and soft particles and has opposing properties. In order to study the change in flexural and compressive strength by designing different mixing ratios using 50% of oyster shell powder and egg shell powder as a filling material. As a result of the experiment, there is almost no difference in the result.

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Structural lightweight concrete containing expanded poly-styrene beads; Engineering properties

  • Vakhshouri, Behnam
    • Steel and Composite Structures
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    • 제34권4호
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    • pp.581-597
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    • 2020
  • Light-Weight Concrete containing Expanded Poly-Styrene Beads (EPS-LWC) is an approved structural and non-structural material characterized by a considerably lower density and higher structural efficiency, compared to concrete containing ordinary aggregates. The experimental campaign carried out in this project provides new information on the mechanical properties of structural EPS-LWC, with reference to the strength and tension (by splitting and in bending), the modulus of elasticity, the stress-strain curve in unconfined compression, the absorbed energy under compression and reinforcement-concrete bond. The properties measured at seven ages since casting, from 3 days to 91 days, in order to investigate their in-time evolution. Mathematical relationships are formulated as well, between the previous properties and time, since casting. The dependence of the compressive strength on the other mechanical properties of EPS-LWC is also described through an empirical relationship, which is shown to fit satisfactorily the experimental results.

샌드위치 복합재 구조의 손상에 의한 잔류 강도 연구 (A Study on Residual Strength of Damaged Sandwich Composite Structure)

  • 공창덕;박현범;김상훈;송민수
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2008년도 춘계학술대회 논문집
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    • pp.2073-2079
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    • 2008
  • This study aims to investigate the residual strength of sandwich composites with Al honeycomb core and carbon fiber face sheets after the quasi-static indentation damage by the experimental investigation. The 3-point bending test and the edge-wise compressive strength test were used to find the mechanical properties. The quasi-static point load and damaged hole was applied to introduce the simulated damage on the Each damaged specimens were finally assessed by the 3-point bending test and the compressive strength test. The investigation results revealed the residual strength of the damaged specimens due to the quasi-static indentation.

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유진놀을 이용한 수산화아파타이트 성형체에 관한 연구 (Study on the Hydroxyapatite Body Using with the Eugenol)

  • 류수착
    • 한국재료학회지
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    • 제14권6호
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    • pp.375-378
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    • 2004
  • The samples were prepared with hydroxyapatite(HAp) powder and eugenol (Eugenol/HAp = 15, 20, 25, 30wt%). The samples were dried at room temperature. The higher mechanical properties was observed in HAp sample with 25wt% Eugenol. The average compressive and bending strength in HAp with 25wt% Eugenol are 542 kgf/$\textrm{mm}^2$ and 366 kgf/$\textrm{mm}^2$ respectively. This strength is higher compare to that of the cortical bone.

콘크리트 면처리제를 이용한 이어치기면의 역학적 특성에 관한 연구 (A Study on the Properties of Successive Pours Surface Using the Concrete Surface Finishing Agent)

  • 박유신;김영근;장성주;서치호;소양섭
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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    • pp.723-728
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    • 1997
  • The aim of this study is to define the physical properties of successive pours surfaces of concrete by various surface treatment methods with the laps of time. This paper is intended to study on the physical properties (the compressive strength, the tensile strength, the shear bonding strength and the bending strength) of the concrete successive pours surface used concrete surface finishing agent.

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천연섬유강화 폴리머 복합재료의 압축강도 특성 (Compressive Strength of Natural Fiber Reinforced Polymer Composites)

  • 송준희;문상돈;김유경;김홍건
    • 한국생산제조학회지
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    • 제19권1호
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    • pp.140-144
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    • 2010
  • In recent years there has been a growing interest for the use of natural fibers in composite applications due to their low cost, environmental friendliness, and good mechanical properties. The purpose of this study is to determine the characteristic of bending strength on bamboo fiber reinforced polymer composites. The parameters of RTM process depend on the weight ratio of bamboo fiber and resin, the number of bamboo ply and amount of hardening agent. Besides the existence of pore in composites according to vacuum time investigated a effect on mechanical properties of reinforced polymer composites. Test result shows that compressive strength was a maximum(approximately 1,840kgf/$cm^2$) value when weight ratio of resin was 12%.

The Effect of Compressive Residual Stresses of Two-stage Shot Peening for Fatigue Strength of Spring Steel

  • Park, Keyoung Dong;Jung, Chang Gi;Kwon, Oh Heon
    • International Journal of Safety
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    • 제1권1호
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    • pp.24-27
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    • 2002
  • Recently the steel parts used in automobiles are required to be used under high stress more than ever before due to the need of keeping the weight down. To achieve this requirement of the high strength steel, it must be necessary to decrease inclusion contents and surface defects as like decarburization, surface roughness etc. In this study, the surface conditions are measured to know the influence on fatigue properties by two cases of two-stage shot peening and single-stage shot peening. And for this study, three kinds of spring steel (JISG408l-SUP7, SAE 9254 and DIN 50CrV4) are shaped. This study shows the outstanding improvement of fatigue properties at the case of two-stage shot peening in the rotating bending fatigue test and it results from (1) decreasing the surface roughness (2) unchanging the surface hardness (3) increasing the compressive residual stress. Moreover, results also show fatigue failures originated at the inclusion near the surface, and this inclusion type is turned out to be an alumina of high hardness.