• 제목/요약/키워드: Compressive properties

검색결과 4,072건 처리시간 0.029초

불산부생 II 형 무수석고와 포졸란 미분체가 혼입된 고강도콘크리트의 특성에 관한 연구 (A Study on Properties of the High-Strength Concrete Admixed with II-Anhydrite and Pozzolanic Fine Power)

  • 조민형;길배수;전진환;김도수;남재현;노재성
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 1997년도 봄 학술발표회 논문집
    • /
    • pp.136-145
    • /
    • 1997
  • The purpose of this study is to develope of alternative adimixture for manufacture of PHC pile(compressive strength above 800kg/$\textrm{cm}^2$). For the investigation, properties of alternative admixture admixed with II-anhydrite and pozollanic fine powders(e.q., Fly-ash, Silica-Fume), the fluidity and viscosity in the cement pastes, the fluidity and compressive strength in mortars at steam curing condition, were respectively examined. Also, properties of compressive strength of concretes with exiting admixture(specimen name SM) and alterantive admixture(specimen name AP) for PHC pile, at steam and standard curing condition, were compared each other. As a result of this experimental study, it was found that specimens admixed with II-anhydrite and pozollanic fine powders had an increase on the fluidity of cement paste and mortar, and compressive strength of mortar and concrete was as good as concrete with SM.

  • PDF

Effect of microorganism on engineering properties of cohesive soils

  • Yasodian, Sheela Evangeline;Dutta, Rakesh Kumar;Mathew, Lea;Anima, T.M.;Seena, S.B.
    • Geomechanics and Engineering
    • /
    • 제4권2호
    • /
    • pp.135-150
    • /
    • 2012
  • This paper presents the study of the effect of microorganism Bacillus pasteurii on the properties such as Atterbergs' limit and unconfined compressive strength of cohesive soils. The results of this study reveal that the liquid limit and plasticity index for all clay soils decreased and the unconfined compressive strength increased. Decrease in plasticity index is very high for Kuttanad clay followed by bentonite and laterite. The unconfined compressive strength increased for all the soils. The increase was high for Kuttanad soil and low for laterite soil. After 24 h of treatment the improvement in the soil properties is comparatively less. Besides the specific bacteria selected Bacillus pasteurii, other microorganisms may also be taking part in calcite precipitation thereby causing soil cementation. But the naturally present microorganisms alone cannot work on the calcite precipitation.

An Experimental Study on Evaluation of Compressive Strength in Cement Mortar Using Averaged Electromagnetic Properties

  • Kwon, Seung-Jun;Maria, Q. Feng;Park, Tae-Won;Na, Ung-Jin
    • International Journal of Concrete Structures and Materials
    • /
    • 제3권1호
    • /
    • pp.25-32
    • /
    • 2009
  • A non-destructive testing (NDT) method for evaluating physical properties of concrete including the compressive strength is highly desirable. This paper presents such an NDT method based on measurement of electromagnetic (EM) properties of the material. Experiments are carried out on cement mortar with different water/cement (W/C) ratios. Their EM properties including the conductivity and the dielectric constant are measured at different exposure conditions and curing periods over a wide frequency range of the EM wave. The compressive strength of these specimens is also tested. It is found that both the conductivity and the dielectric constant increase as the W/C ratio decreases and the curing period increases, which lead strength development in the specimens. A linear correlation is observed between the averaged EM properties over the 5 to 20 GHz frequency range and the measured compressive strength, demonstrating the effectiveness of the EM property-based NDT method in evaluating strength of OPC mortar.

여러 가지 조건을 가진 직물 복합재료 시편의 압축특성 (Compressive Characteristics of Fabric Composites with Various Conditions)

  • 전성식;오제훈;장승환
    • 한국복합재료학회:학술대회논문집
    • /
    • 한국복합재료학회 2004년도 추계학술발표대회 논문집
    • /
    • pp.135-138
    • /
    • 2004
  • Because the compressive properties such as compressive stiffness and compressive maximum strength of the fabric composite materials are essential to analyse the drape behaviour and estimate the quality of the final products, compressive tests of fabric composites with different stacking sequences were performed. Appropriate shape and dimensions for the compressive test specimens were prepared and several specimens with different conditions were tested and compared with each other.

  • PDF

Fundamental Properties of Antiwashout Underwater Concrete Mixed with Mineral Admixtures

  • Han-Young, Moon;Kook-Jae, Shin;Yong-Kyu, Song
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2003년도 가을 학술발표회 논문집
    • /
    • pp.457-460
    • /
    • 2003
  • This paper discusses laboratory evaluations to assess the physical properties of antiwashout underwater concrete (AWC) containing pozzolanic materials such as fly ash (FA), blast furnace slag (SG) and metakaolin(MK). For the experiments, pH value, suspended solids, slump flow, efflux time and compressive strength were tested. According to the results from compressive strength test, MK10 showed the very high compressive strength characteristic during the entire curing days, but the rate of strength development was decreased as time goes by.

  • PDF

그래핀 혼입 초고강도 콘크리트의 물성에 대한 실험적 연구 (Experimental study on the properties of UHPC mixed with graphene)

  • 서태석;이현승;김강민
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2022년도 가을 학술논문 발표대회
    • /
    • pp.199-200
    • /
    • 2022
  • In this study, the material properties of UHPC mixed with graphene was investigated. The compressive strength, the bending strength and the permeability test was conducted. As a result, there was no improvement in compressive strength by the graphene, but the bending strength increased by 20% by the graphene. The water penetration amount decreased by 80% by the graphene.

  • PDF

혼합모래를 사용한 콘크리트의 강도 특성 (Compressive Strength Characteristics of Concrete Using in Crushed Sand)

  • 백동일;염치선;김명식;김종수
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
    • /
    • pp.731-734
    • /
    • 2005
  • Crushed sand is blended in order to investigate the quality changes and characteristics of concrete with variation of blend ratio of crushed sand (50, 60, 70, 80, 90, $100\%$). Slump and air content were measured to investigate properties of fresh concrete, and unit weight, compressive strength and modulus of elasticity in age of 7, 28, 60, 90, 180 days were measured to investigate properties of hardened concrete. Compressive strength, unit weight and modulus of elasticity were increased as time goes by and they are expected to keep on increasing in long-term age as well. As a result of measuring compressive strength and modulus of elasticity in age of 7, 28, 60, 90, 180days, compressive strength was highest when it is $70\%$ of blended ratio.

  • PDF

인공경량골재 사용 경량투수블록의 제조시간 변화에 따른 배합 및 압축강도 특성 (A Compressive Strength and Mixing Properties of Lightweight Porous Block Using Lightweight Aggregate by Variation of Manufacture Time)

  • 김영욱;이경수;오태규;정수빈;반준모;최세진
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2018년도 추계 학술논문 발표대회
    • /
    • pp.118-119
    • /
    • 2018
  • The purpose of this study is to investigate the compressive strength and mixing properties of the lightweight block, which has been manufactured without the pre-wetting process, in the lightweight block using domestic artificial lightweight aggregate. The test results of the specimens produced within 30 minutes after the preparation showed high compressive strength but poor permeability. Therefore, the elapsed time after the manufacture, which is expected to have required compressive strength and permeability, was about 60 minutes in this study.

  • PDF

알칼리 자극제가 지오폴리머 페이스트의 압축강도와 탄산화 특성에 미치는 영향에 관한 연구 (A study on the Effect of Alkali-admixture on Compressive Strength and Carbonation properties of Geopolymer paste)

  • 윤창복;박장현
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2022년도 가을 학술논문 발표대회
    • /
    • pp.187-188
    • /
    • 2022
  • In this study, the compressive strength and carbonation properties of geopolymer paste according to the amount of alkali admixture added were evaluated for the development of geopolymer concrete that recycles industrial waste. A geopolymer paste specimen was prepared using Ca(OH)2 as an admixture, and the prepared specimen was standard cured for 28 days. After curing, the compressive strength of the specimen was measured. As the amount of alkali admixture increased, the compressive strength increased. After curing, carbonation was carried out for 7 days in a CO2 5% environment. As a result of comparative evaluation of the amount of CaCO3 produced according to carbonation, the amount of CaCO3 produced increased as the amount of Ca(OH)2 added increased. However, when the amount of admixture added exceeds 5%, the increase rate decreases, so the optimum addition rate is considered to be 5%.

  • PDF

무기안료가 시멘트모르타르의 압축강도와 흡수율에 미치는 영향 (The Influence of Inorganic Pigments on the Compressive Strength and Absorption of Cement Mortars)

  • 송혁;이재용;고성석
    • 한국안전학회지
    • /
    • 제19권2호
    • /
    • pp.104-111
    • /
    • 2004
  • The aim of this study was to investigate the influence of inorganic pigments on the physical properties of cement mortar. For this purpose, the compressive strength and absorption test were carried out on cement mortar imxed with inorganic pigments by changing the proportion of cement mortar, water-cement ratio, and ratio of pigment. The result of this study can be summarized as follows: the compressive strength of colored mortar rapidely increased in red and yellow mortar, as the mix ratio of pigment increased. In case of green and black mortar, however, the compressive strength decresed as the mix ratio incresed. In case of red and yellow mortar, the absorption of colored mortar increased as the mixing ratio increased, if the mean particle diameter of the pigment is small. In case of green and black mortar, the absorption ratio decreased as the mix ratio increased. After investigating the overall physical properties of colored mortar, it was confirmed that the proper mix ratio of pigment securing the properties of colored mortar was below 6% of the weight of the cement to be used.