• Title, Summary, Keyword: Shrinkage

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A Study on the Effect of the Shrinkage Strip on Shrinkage and Thermal Change of Concrete (건조수축 및 온도영향에 대한 건조수축대의 효과 연구)

  • 김록배;김욱종;이도범;이운세
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.251-256
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    • 2001
  • Shrinkage during the curing and drying of concrete is unavoidable and results in many cracks. Shrinkage strips reduce effectively shrinkage stresses and minimize shrinkage cracks by being left open for a certain time during construction allow a significant part of the shrinkage to occur without inducing stresses. This study verifies the effectiveness of shrinkage strips and provides the guide for construction of such strips.

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Shrinkage Properties of High Performance Concrete with Shrinkage Reducing Agent (수축저감제를 사용한 고성능 콘크리트의 수축특성)

  • Koh, Kyung-Taek;Kim, Do-Gyeum;Han, Cheon-Goo;Lee, Jang-Hwa
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.9 no.1
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    • pp.181-188
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    • 2005
  • Generally, high performance concrete has characteristics such as low water-cementitous material ratio, lots of unit binder powder, thus the drying shrinkage and autogenous shrinkage are tend to be increased. The purpose of this study is to investigate the effect of the glyclos based shrinkage reducing agent on the drying shrinkage and autogenous shrinkage of high performance concrete with 30% of water-cemetitious material ratio as a study to develop the technology to reduce the concrete shrinkage. Test results show that the drying and autogenous shrinkage of high performance concrete are reduced by about 20~35% at the mixing ratio of shrinkage reducing agent of 0.5%, and 1.0%, compared with plain concrete. Therefore, it analyze that the using of shrinkage reducing agent is effective to reduce the drying shrinkage and autogenous shrinkage of high performance concrete.

Effect of Admixtures on Drying Shrinkage Crack of Hardened Cement Mortar (시멘트경화체의 건조수축균열에 미치는 혼화재의 영향)

  • 이승한;이종석
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.229-233
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    • 1995
  • In this study we have the properties of drying shrinkage crack of hardened cement mortar using admixtures. The drying shrinkage cracking test process has been examined by the restrained drying shrinkage strain by restraining rate measuring properties of strain-with- restraint by JIS original proposal and keeps a flow value of mortar about 100$\pm$5%. The results show that the usage of shrinkage reducing agent 1.5% was effective on the control of drying shrinkage in OPC and CP by restraining rate 20% and strain-with-restraing 20~30 $\mu$, the usage of expansion agent 0.45% was effective by restraining rate 50~60% and strain-with-restraint 40~80$\mu$, and the effectiveness was increased with shrinkage reducing agent. Also. admixtures such as Flyash, CP and NC reduced restrained shrinkage and drying shrinkage cracking and more with shrinkage reducing agent

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Shrinkage and Cracking Behavior of Ultra High Strength Concrete (초고강도 콘크리트의 수축 및 균열 특성에 관한 연구)

  • Kim Ji Won;Sohn Yu Shin;Lee Joo Ha;Yoon Young Soo
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.9-12
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    • 2005
  • In this study, to investigate shrinkage and cracking behavior of 120MPa UHSC, free and restrained drying shrinkage test were performed. Three strength levels(50MPa, 80MPa, 120MPa) were used and the effect of mineral admixtures(fly ash, slag) on free and restrained shrinkage was investigated. From comparing the result of pin -penetration test with the result of ring test, Time-Zero was determined as initial set. Shrinkage test results show that autogenous shrinkage of UHSC was much higher than that of HSC, VHSC and fly ash delayed cracking age in UHSC by decreasing autogenous shrinkage. Additional free concrete rings(with restraint removed) were also tested to check the influence of the geometry of the specimens on free shrinkage. And then the relationship between free shrinkage and restrained shrinkage was investigated.

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A Study on the Shrinkage Reducing Properties of Steel Fiber Reinforced Ultra High Strength Cement Mortar (강섬유보강 초고강도 시멘트 모르터의 수축저감에 관한 연구)

  • Han Dong-Yeop;Heo Young-Sun;Pei Chang-Chun;Han Cheon-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.67-70
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    • 2005
  • Ultra high strength concrete, nowadays, has been widely applied to construction of high-rise building. To improve ductility and mechanical properties, steel fiber is employed in UHSC. This study investigates practical application of expansive additives(EA) and shrinkage reducing agent(SRA), in order to secure volumetric stability and improved mechanical properties, such as autogenous shrinkage and dry shrinkage of steel-fiber-reinforced-ultra-high-strength-comet-mortar(FHSM). According to the test, individual addition of steel fiber does not affect shrinkage reduction, as expected. However FHSM, with combined addition of 5$\%$ of EA and 1$\%$ of SRA decreased 60$\%$ of autogenous shrinkage. It is considered that Proper combination of EA and SRA can secure the shrinkage resistance of FHSM.

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The coupling effect of drying shrinkage and moisture diffusion in concrete

  • Suwito, A.;Ababneh, Ayman;Xi, Yunping;Willam, Kaspar
    • Computers and Concrete
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    • v.3 no.2_3
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    • pp.103-122
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    • 2006
  • Drying shrinkage of concrete occurs due to the loss of moisture and thus, it is controlled by moisture diffusion process. On the other hand, the shrinkage causes cracking of concrete and affects its moisture diffusion properties. Therefore, moisture diffusion and drying shrinkage are two coupled processes and their interactive effect is important for the durability of concrete structures. In this paper, the two material parameters in the moisture diffusion equation, i.e., the moisture capacity and humidity diffusivity, are modified by two different methods to include the effect of drying shrinkage on the moisture diffusion. The effect of drying shrinkage on the humidity diffusivity is introduced by the scalar damage parameter. The effect of drying shrinkage on the moisture capacity is evaluated by an analytical model based on non-equilibrium thermodynamics and minimum potential energy principle for a two-phase composite. The mechanical part of drying shrinkage is modeled as an elastoplastic damage problem. The coupled problem of moisture diffusion and drying shrinkage is solved using a finite element method. The present model can predict that the drying shrinkage accelerates the moisture diffusion in concrete, and in turn, the accelerated drying process increases the shrinkage strain. The coupling effects are demonstrated by a numerical example.

Study on the Engineering Properties of 150MPa Ultra-high Strength Concrete

  • Jung, Sang-Jin;Yoshihiro, Masuda;Kim, Woo-Jae;Lee, Young-Ran;Kim, Seong-Deok;Ha, Jung-Soo
    • Journal of the Korea Institute of Building Construction
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    • v.10 no.4
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    • pp.113-122
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    • 2010
  • In this study, 150MPa ultra-high-strength concrete was manufactured, and its performance was reviewed. As technically meaningful autogenous shrinkage reportedly occurs at a W/B ratio of 40% or less, although it occurs in all concrete regardless of the W/B ratio, the effects of the use of expansive admixture and shrinkage reducer, or of the friction and restraint of forms that may result in the effective reduction of autogenous shrinkage, were reviewed. As a result, considering the flow and strength characteristics, it was found that the slump flow time was shorter with expansive admixture, and shortest with shrinkage reducer. All specimens with $30kg/m^3$ expansive admixture showed high strength at early material age. Their strength decreased due to the expansion cracks when there was excessive use of expansive admixture, and the use of shrinkage reducer did not influence the change in the strength according to the material age. The expansive admixture had a shrinkage reduction effect of 80%, while the shrinkage reducer had a shrinkage reduction effect of 30%, indicating that the expansive admixture had a stronger effect. It seems that mixing the two will have a synergistic effect. The shrinkage reduction rate was highest when the W/B ratio was 20%. The form suppressed the expansion and shrinkage at the early period, and the demolding time did not significantly influence the shrinkage. The results of the study showed that the excessive addition of expansive admixture leads to expansion cracks, and the expansive admixture and shrinkage reducer have the highest shrinkage reduction effect when they are mixed.

Multi-physics Modelling of Moisture Related Shrinkage in Concrete (콘크리트 수분관련 수축에 관한 다중물리모델)

  • Lee, Chang-Soo;Park, Jong-Hyok
    • Journal of Korean Society of Hazard Mitigation
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    • v.9 no.2
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    • pp.1-9
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    • 2009
  • Water binder ratio combine high-performance concrete shrinkage of less than 0.4 to determine the transformation to a total shrinkage of water to move outside and internal consumption of moisture due to drying shrinkage and autogenous shrinkage, and then, the relative humidity changes and strain to be approached by surface physics describe the relationship between self-desiccation and autogenous shrinkage was set. To verify the self-desiccation in the humidity shrinkage and humidity measurements performed, and the research model, Tazawa, CEB-FIP model than to let the measure and the most similar results in this study based on self-desiccation model, autogenous shrinkage didn't represent the linear shrinkage by the drying shrinkage of the external moving but exponential relationships, unlike with the nature and rapid in the early age properly describes the attributes in shrinkage could see. After this research to move moisture and to reflect the shrinkage model, temperature, moisture transfer, strain analysis by multi-physics model is very similar to the results of mock-up specimen measurements performed for this research, the value measured by the internal consumption of moisture, therefore self-desiccation and a multi-physics model considering autogenous shrinkage might be relevant.

A study on the transverse shrinkage for the butt joint welding of plate (평판의 맞대기 이음 용접시의 가로수축에 관한 연구)

  • 이우수;왕지석
    • Journal of Welding and Joining
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    • v.5 no.3
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    • pp.46-52
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    • 1987
  • The mechanism of transverse shrinkage for the butt joint weldig of plates is investigated in this paper. It was certified that the compressive plastic strain due to thermal expansion of materials during heating play an important role on the transverse shrinkage. It was also pointed out that the transverse shrinkage has to be treated with the samples of which the shapes are as close to real shapes of welded materials as possible, because the distribution of temperature and relative rigidity of materials during welding have great influence on the transverse shrinkage. The formulas for the calculation of transverse shrinkage were presented and the experiments were carried out in order to verify the formulas. the main results are as follows; 1. For the bead-on-plate welding, the transverse shrinkage in the begining parts of welding is the smallest, the end parts is next and the transverse shrinkage of mid section is the largest. 2. In bead-on-plate welding, the equations presented in this paper concerning transverse shrinkage coincide fairly well with the experimental values generally. 3. Transverse shrinkage increases generally as specific heat input per unit thickness increaes.

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A Study on injection mold shrinkage estimates (사출 금형 수축률 산정에 관한 연구)

  • Choi, Gwang-Hyeck;Han, Seong-Ryeol;Lee, Chun-Kyu
    • Journal of the Korea Society of Die & Mold Engineering
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    • v.10 no.3
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    • pp.30-33
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    • 2016
  • It is true that the plastic shrinkage is inevitable. Shrinkage rate in effect at the time of mold design will soon determine the size of the global product. Process for the shrinkage of the plastic that provides how made, yet it has identified a process for making the question whether the shrinkage that can be trusted, and by the experimental results were as follows: as shrinkage, see ISO but, according to circumstances the process can go to the agreement between the parties. shrinkage ratio of the pressure sensor installed in the specimen mold is essential, amount of pressure sensor is that it is appropriate approximately 2-3. proper holding pressure is a significant effect on shrinkage Mitch, so that the effect of selecting the contraction ratio data according to the appropriate holding pressure during mold making. shrinkage CAE analysis results are difficult to utilize in the mold-making chamber. Based on these results, it concluded by looking forward to the improved products produced shrinkage.