• 제목/요약/키워드: lightweight

검색결과 2,766건 처리시간 0.031초

인공경량골재 혼합비율에 따른 경량 콘크리트의 물성 및 강도특성에 관한 연구 (The Study on the Physical and Strength Properties of Lightweight Concrete by Replacement Ratio of Artificial Lightweight Aggregate)

  • 최세진;김도빈;이경수;김영욱
    • 한국건축시공학회지
    • /
    • 제19권4호
    • /
    • pp.313-322
    • /
    • 2019
  • 본 연구는 최근 사용량이 증대하고 있는 저시멘트 배합을 대상으로 국내생산 인공경량 잔 굵은골재의 혼합비율에 따른 경량콘크리트의 물성 및 강도특성을 비교 검토한 것으로서 실험결과, 프리웨팅 시간이 24시간 증가할 경우 모르타르 플로우값이 약 3~5% 감소하는 것으로 나타났으며 경량잔골재 사용에 의해 모르타르 배합에서 약 10.4%의 기건단위질량 감소효과를 얻을 수 있는 것으로 나타났다. 또한 경량굵은골재의 혼합비율에 따른 경량콘크리트의 기건단위질량은 5~10mm 크기인 LWG10 경량굵은골재의 혼합비율이 높아질수록 선형적으로 기건단위질량이 증가하였으며 LWG10 경량굵은골재를 혼합할 경우 LWG10 혼합비율에 관계없이 재령 7일에 약 30~31MPa 수준의 유사한 압축강도를 발현하였다.

인공경량골재를 사용한 콘크리트의 물성에 미치는 배합요인의 영향 (Influence of the Mixing Factor on the Properties of Concrete Used Artificial Lightweight Aggregates)

  • 신재경;최진만;정용
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2008년도 추계 학술논문 발표대회
    • /
    • pp.73-77
    • /
    • 2008
  • Structural lightweight concrete will reduced total loads of supporting sections and foundations in archtectural and civil structures. So, the lightweight concrete can be used widely for various purpose in the archtectural and civil structures. This paper were examined the influence of the mixing factor on the fresh and hardened properties of lightweight concrete that are used 2types of the differences properties of lightweight aggregates. According to types of lightweight aggregates, the case of synthetic lightweight aggregate are have need higher s/a; 2~4% on mixing proportion. Lightweight concrete was somewhat exhibit lower compressive strength than ordinary concrete. However it was not showed a marked difference. According to types of lightweight aggregates, the case of synthetic the lightweight aggregate are highest performance in fresh and hardened concrete.

  • PDF

구조용 경량골재 개발에 따른 경량콘크리트의 동결융해특성에 관한 연구 (Property Evaluation of the Freeze-Thawing for Lightweight Concrete with Development of Structural Lightweight Aggregates)

  • 장동일;채원규;조광현;김광일;손영현
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 1998년도 봄 학술발표회 논문집(I)
    • /
    • pp.129-136
    • /
    • 1998
  • In this study, lightweight aggregates were developed to see the possible application as a structural uses. For the evaluation purpose, several testings were conducted to compare the physical characteristics between the controlled lightweight aggregates and other lightweight aggregates purchased from different sources. The tests included property changes of fresh concrete and strength characteristics of hardened concrete for both normal and high strength ranges. In addition, a experiment was performed to analyze the freezing and thawing resistance of new lightweight aggregate concrete against other lightweight aggregate concrete against other lightweight aggregate concretes with some experimental parameters such as lightweight aggregates, curing conditions, and water-cement ratio. The test showed that the new lightweight aggregate could be used structural components. Continuous study will be planned for future evaluations.

  • PDF

경량 폴리머 모르타르의 발열온도특성과 가사시간의 관계 (Relationships between Exotherm Temperature and Working Life of Lightweight Polyester Mortars)

  • 최동순;이윤수;;연규석
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
    • /
    • pp.315-318
    • /
    • 1999
  • This paper deals with the relationships between the exotherm temperature and working life of lightweight polyester mortar. Polyester mortars using types of lightweight aggregate compositions are prepared, and tested for exotherm temperature during hardening and working life. It is concluded from the test results that the behavior of exotherm temperature of lightweight polyester mortars is considerably affected by the lightweight aggregate composition. The lightweight polyester mortars using a lightweight aggregate compositeion ES gradually develop an exotherm temperature from 2$0^{\circ}C$, and give a working life. Then the exotherm temperature rises sharply up to a maximum exotherm temperature. The working life of the lightweight polyester mortars shortens with increasing catalyst and accelerator contents. The maximum exotherm temperature of the lightweight polyester mortars rises with increasing catalyst and accelerator contents.

  • PDF

인공경량골재 크기 및 혼입량에 따른 경량기포콘크리트의 물리적 성능 평가에 관한 실험적 연구 (An Experimental Study on the Performance Evaluation of Lightweight Foamed Concrete According to Size and Replacing Ratio of Artificial Lightweight Aggregate)

  • 정성민;윤창연;이한승
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2017년도 춘계 학술논문 발표대회
    • /
    • pp.162-163
    • /
    • 2017
  • This study investigated the properties of lightweight foamed concrete by using synthetic foaming agent and artificial lightweight aggregate. The effects of artificial lightweight sizes on the compressive strength, density and pore structure of the concrete were investigated. The samples were assessed by MIP analysis and simultaneous SEM was used to study their pore distribution. This study showed the improvement of important properties of lightweight foamed concrete. Lower pore distribution and correspondingly higher compressive strength values were reached. This is for the purpose of providing basic data for the use of lightweight foamed concrete through improvement on the problem such as unstability, falling in fluidity and the strength of existed foaming agent.

  • PDF

경량골재의 종류에 따른 시멘트 경화체의 강도 특성 평가 (Compressive Strength Property of Cement Matrix According to the Type of Lightweight Aggregate)

  • 편명장;정수미;김주성;김호진;박선규
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2022년도 봄 학술논문 발표대회
    • /
    • pp.111-112
    • /
    • 2022
  • Lightweight aggregate is a porous material that has a lower density than natural aggregate and is a lightweight construction material. Lightweight Aggregate has a suitable purpose because it is effective in reducing the heavy unit mass in high-rise buildings. However, since lightweight aggregate has weak strength and high water absorption compared to natural aggregate, it is difficult to control the quality of concrete. Although lightweight aggregate has disadvantages such as high water absorption, it is expected that the demand for lightweight aggregate concrete will continue to use in the future because the advantage of being able to reduce the weight of concrete is greater. In this study, we conducted an experimantal study on the compressive strength property of cement matrix according to the type of lightweight aggregate.

  • PDF

본딩효과를 고려한 폐어망 보강 경량토의 압축강도 특성 (Strength Characteristic of Waste Fishing Net-added Lightweight Soil Considering Glue Treatment)

  • 윤대호;김윤태
    • 한국해양공학회지
    • /
    • 제26권3호
    • /
    • pp.39-45
    • /
    • 2012
  • This paper investigates the strength characteristics and stress-strain behaviors of waste fishing net (WFN)-added lightweight soil. The lightweight soil, which consisted of dredged soil, crumb rubber, and cement, was reinforced with WFN in order to increase its shear strength. Glue treated WFN was also added to lightweight soil to improve the interlocking between the soil mixture and WFN. Three kinds of test specimens were prepared: unreinforced lightweight soil, reinforced lightweight soil without glue treatment, and reinforced lightweight soil with glue treatment. Several series of laboratory tests were carried out, including flow value tests, unconfined compression tests, and SEM analyses. From the experimental results, it was found that the peak strength of the reinforced lightweight soil with glue treatment was increased by the increased interlocking between the soil mixture and WFN, which was induced from the bonding effect. The stress-strain relation of the reinforced lightweight soil, irrespective of the glue treatment, showed a more ductile behavior than that of the unreinforced lightweight soil.

발포유리소재를 잔골재로 부분 치환한 경량콘크리트의 특성 (Properties of Light-weight Concrete containing Foamed Glass as a part of Fine Aggregate)

  • 이진우;박희곤;배연기;이재삼;이근행;문성환
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2008년도 추계 학술논문 발표대회
    • /
    • pp.113-116
    • /
    • 2008
  • In these days, properties of concrete has been demanded to be high performance because concrete structure was bigger and higher. So studies on high strength concrete and lightweight concrete has been frequently done. But lightweight concrete has been used to limited non-structural elements in th country. Lightweight aggregate mixed with lightweight concrete was only coarse aggregate in case of the structural lightweight concrete. In the country studies on the lightweight concrete was poor and unvaried. Also it is difficult to be practical use of lightweight concrete was that it has been expensive. It was study on the using fine lightweight aggregate with lightweight concrete to crushed by-products and wastes to get to make foamed glass with recycled glass. So it was tested by fine aggregate standard and mixed with.

  • PDF

시험방법에 따른 친환경 경량콘크리트의 상대동탄성 계수 비교 (Relative Dynamic Modulus of Elasticity Comparison of the Eco-friendly Lightweight Concreate According to the Experimental Method)

  • 이수형;이한백
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2016년도 춘계 학술논문 발표대회
    • /
    • pp.181-182
    • /
    • 2016
  • We developed eco-friendly lightweight concrete in order to apply eco-friendly lightweight concrete into structural wall or slab of shallow depth urban railway system. However, since lightweight aggregate has different structural feature of porous and it has been overvalued at current KS standard when applied, we did compare the characteristics of freezing and thawing of normal weight aggregate concrete by comparative test method(KS, ASTM). According to test method, there was a big difference of dynamic elastic modulus in lightweight concrete rather than in normal weight aggregate concrete. The big absorption factor in lightweight aggregate is main reason for that. For more detail, in KS law in which only 14 days water curing is carried out, the big amount of moisture in lightweight aggregate is frozen and high heaving pressure occurs and finally that lead to destruction of lightweight concrete. Therefore, it is considered that in case of lightweight concrete, resistibility against freezing and thawing has been undervalued in domestic KS law compared to ASTM law, which is overseas standard. So, a variety of examination about testing criteria and rule would be necessary for exact assessment of lightweight concrete.

  • PDF

Field-Observed Cracking of Paired Lightweight and Normalweight Concrete Bridge Decks

  • Cavalline, Tara L.;Calamusa, Jeremy T.;Kitts, Amy M.;Tempest, Brett Q.
    • International Journal of Concrete Structures and Materials
    • /
    • 제11권1호
    • /
    • pp.85-97
    • /
    • 2017
  • Research has suggested that conventional lightweight concrete can offer durability advantages due to reduced cracking tendency. Although a number of publications exist providing the results of laboratory-based studies on the durability performance of lightweight concrete (with lightweight coarse aggregate) and internally cured concrete (using prewetted lightweight fine aggregate), far fewer field studies of durability performance of conventional lightweight concrete bridge decks in service have been performed. This study was commissioned to provide insight to a highway agency on whether enhanced durability performance, and therefore reduced maintenance and longer lifecycles, could be anticipated from existing lightweight concrete bridge decks that were not intentionally internally cured. To facilitate performance comparison, each lightweight bridge deck selected for inclusion in this study was paired with a companion normalweight bridge deck on a bridge of similar structural type, deck thickness, and geometric configuration, with similar age, traffic, and environmental exposure. The field-observed cracking of the decks was recorded and evaluated, and crack densities for transverse, longitudinal, and pattern cracking of the normalweight and lightweight deck in each pair were compared. Although some trends linking crack prevalence to geographic location, traffic, and age were observed, a distinct difference between the cracking present in the paired lightweight and normalweight bridge decks included in this study was not readily evident. Statistical analysis using analysis of covariance (ANCOVA) to adjust for age and traffic influence did not indicate that the type of concrete deck (lightweight or normalweight) is a statistically significant factor in the observed cracking. Therefore, for these service environments, lightweight decks did not consistently demonstrate reduced cracking.