• Title/Summary/Keyword: 거푸집 제거시기

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Characteristics of Compressive Strength of Concrete due to Form Curing Condition (거푸집 양생 조건에 따른 콘크리트의 압축강도 특성)

  • Kim, Kyoungnam;Park, Sangyeol;Moon, Kyoungtae;Shim, Jaeyong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.38 no.1
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    • pp.19-28
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    • 2018
  • The time for form removal is an important factor for ensuring the safety and economical efficiency of concrete structures, because it affects the quality, period, and cost of construction. Although local specifications suggest the form curing time, there is a problem of low quality of concrete due to early removing of form. This is because they do not fully understand effect of curing condition, and they want to shorten construction period in the field. Therefore, this research evaluates the effect of curing condition according to the time for form removal by testing specimen. As a result, the concrete compressive strength at the age of 28 days decreased about 40% in the condition of form removal after 12 hours, while the strength in the condition of form removal after 28 days decreased about 7%. Finally, this paper suggests an estimating equation for the concrete compressive strength due to the time for form removal considering various curing temperatures as equivalent ages. The proposed equation can be used in the field for evaluating the strength after form removal.

Determination of Removal Time of the Side Form in High Strength Concrete (고강도콘크리트 시공시 측면 거푸집 탈형시기의 결정)

  • Han Cheon-Goo;Han Min-Cheol
    • Journal of the Korea Concrete Institute
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    • v.16 no.3 s.81
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    • pp.327-334
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    • 2004
  • In this paper, method for the determination of removal time of the side forms in high strength concrete are discussed using the estimation model of compressive strength development, the development of bond strength and rebound number of P type Schmidt hammer in order to review the validity of existing regulation as to side form removal and offer effective quality control method. According to the results, as W/B increases by $10\%$, the setting time is shortened by about 2 hours. In the scope of the paper, required time to gain 8MPa of compressive strength is determined about 17 ${\~}$20 hours of age and $21{\~}25^{\circ}D{\cdot}D$ of maturity. Bond strength between form and concrete shows the highest value around final setting time, but decreases drastically after that. Amount of concrete sticking on the form is large before setting completed, but after that, its amount shows decline tendency. The rebound value test with P type schmidt hammer can be started faster by 2${\~}$3 hours than compressive strength test. It is also confirmed that the removal of forms is possible when the rebound value of P type schmidt hammer is more than 32. It is found from the results that existing regulation regarding removal time of the side form of high strength concrete provided in KCI needs no revision because required time to gain the strength provided in KCI has no adverse effect on strength development at early age and surface condition during stripping the side form. Effective procedure to decide the removal time of side form can be performed by applying P type Schmidt hammer.

A Study on the Development of Strength Prediction Model and Strength Control for Construction Field by Maturity Method (적산온도 방법에 의한 강도예측모델 개발 및 건설생산현장에서의 강도관리에 관한 연구)

  • Kim, Moo-Han;Jang, Jong-Ho;Nam, Jae-Hyun;Khil, Bae-Su;Kang, Suk-Pyo
    • Journal of the Korea Concrete Institute
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    • v.15 no.1
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    • pp.87-94
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    • 2003
  • Construction plan and strength control have limitations in construction production field because it is difficult to predict the form removal strength and development of specified concrete strength. However, we can have reasonable construction plan and strength control if prediction of concrete strength is available. In this study, firstly, the newly proposed strength prediction model with maturity method was compared with the logistic model to test the adaptability. Secondly, the determination of time of form removal was verified through the new strength prediction model. As the results, it is found that investigation of the activation energy that are used to calculate equivalent age is necessary, and new strength prediction model was proved to be more accurate in the strength prediction than logistic model in the early age. Moreover, the use of new model was more reasonable because it has low SSE and high decisive factor. If we adopt new strength prediction model at construction field, we can expect the reduced period of work through the reduced time of form removal.

Numerical Experiment on Environmental Conditions of Mass Concrete (매스콘크리트의 주변환경조건에 대한 수치실험)

  • 이장화;변근주
    • Magazine of the Korea Concrete Institute
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    • v.9 no.5
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    • pp.217-224
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    • 1997
  • 매스콘크리트의 타설시 온도이력을 정확히 예측하기 위해서는 재령별로 민감하게 변하는 시공 및 주변 환경요인을 엄밀히 반영하여 온도이력을 합리적으로 해석하는 것이 필요하다. 본 연구에서는 시공시에 발생되는 주변환경조건을 고려한 상태에서 온도이력을 해석할 수 있도록 개발된 해석프로그램을 이용하여 주변환경조건에 대한 수치실험을 수행하고자 한다. 수치실험의 목적은 매스콘크리트 타설시 각종 인자가 매스콘크리트의 온도이력에 미치는 영향정도를 정량적으로 파악하여 실제 매스콘크리트의 설계 및 시공시 사전에 콘크리트의 온도이력을 예측하여 효율적으로 관리하는데 있다. 수치실험을 수행한 결과주어진 구조물의 설계조건에 부가하여 타설시기, 타설온도,거푸집조건 및 제거시기, 양생 및 개기온도 등의 시공시 주변환경조건의 영향이 대단히 민감하게 작용하는 것으로 나타났다.

Mock-up Test of Concrete Using AE Water Reducing Agent of Early-Strength Type in Construction Field (조기강도발현형 AE감수제를 사용한 콘크리트의 현장 Mock-up 실험)

  • 황인성;김기훈;김규동;이승훈;한천구
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2004.05a
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    • pp.1-4
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    • 2004
  • In this paper. applicability of high early strength type AE water reducing agent(HESAEWA) developed by the authors is discussed by applying Mock-up test. For fresh concrete properties, concrete using existing AE water reducing agent(EAEWRA) and HESAEW A meets the target slump and air content at jobsite. Setting time of concrete using HESAEWA is shorter than that using EAEWRA. Remarkable variance of bleeding and settlement is not observed with type of AE water reducing agent. For hardened concrete properties, use of HESAEW A results in higher strength development compared with that of EAEWRA at standard curing and in field curing condition. Reaching time to accomplish 5MPa of compressive strength. which is possible to remove side form. is taken using HESAEWA earlier than that of EAEWRA by 1day. Therefore, it is confirmed that use of HESAEWA can meet the requirements of general quality of concrete and achieve high early strength development as well as has a desirable field applicability.

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A Study on Early-strength Development of Concrete Using Accelerating AE Water Reducing Agents for the Estimation of Optimum Duration (촉진형 AE감수제를 사용한 콘크리트의 최적공기산정을 위한 조기강도 발현 특성 연구)

  • Lee, Joo-Hun;Sa, Soon-Heon;Ji, Suk-Won;Jeon, Hyun-Gyu;Seo, Chee-Ho
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2006.11a
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    • pp.91-94
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    • 2006
  • The way to shorten a construction period is considered to an very important technology development element as reducing the formwork removal periods with promoting strength revelation own concrete. This study executed experiment to review usability of early strength revelation chemical admixture which is judged in ways effective with premature removal of form about concrete. Use of early strength revelation AE water reducin admixture is apperaing so that strength revelation by early hydration promotions is excellent. The results of being applied proposed work process are that compressive strength are appeared more than 5MPa within 16 hours so that removal of vertical form was possible. the concrete compressive strength satisfied with a more than 2/3 of specified concrete strength for removal of horizontal form are appeared in 42 hours of 27 MPa proportioning strength, in 36 hours of 30, 35 MPa proportioning strength so that the 6 days cycle time of concrete structural frame work is cut by 2 days as shortening delayed period in works of removing slab forms. So construction cost reductions and a construction period shortening are judged so that it is possible.

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A Study on Properties of Early Strength Development of the Concrete (콘크리트의 조기강도 발현특성에 관한 연구)

  • Kang, Chang-Woon;Lee, Jae-Sam;Kim, Jung-Sik;Sung, Yong-Hwan;Ryu, Deug-Hyun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.11a
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    • pp.541-544
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    • 2008
  • Recently, due to the increase of high-rise buildings construction, many researches for making harden of concrete earlier and remove of forms faster are being performed to reduce construction period. The purpose of this study is to analysis which mixing condition and curing temperature of early strength concrete. Porperties of concrete by the different factors, such as the type of active admixtures, mineral admixtures, curing temperature, the amount of binder, etc. Through the test of concrete using the different type of admixture, PC type was more excellent than PNS type admixture. The concrete Strength remarkably will be able to confirm that decreases from temperature below 12$^{\circ}C$.

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Study on the Manufacturing techniques & Conservation of Iron Pot from Cheonmachong Ancient Tomb (천마총 출토 철부(鐵釜)의 제작기법 및 보존처리)

  • Lee, Seung Ryul;Shin, Yong Bi;Jung, Won Seob
    • Journal of Conservation Science
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    • v.30 no.3
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    • pp.263-275
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    • 2014
  • It's shown how to proceed the study on Manufacturing techniques & Conservation to the Iron Pot from Cheonmachong Ancient Tomb(the 155th Tomb in Hwangnam-dong). In order to investigate manufacturing techniques of the Iron Pot, some parts of the relic were gathered. After mounting, polishing and etching on the relic, analyzing the metal microstructure was conducted. Also it's conducted a SEM-EDS analysis on the nonmetallic inclusion. White iron structure was observed in the metallurgical structure inspection, SEM-EDS analysis. It seems to be dried slowly at room temperature after casting, doesn't look as particular heat treatment to improve brittleness. It is estimated that it's as the handle seam side were verified about 3cm inch wide, 1.5 thick in center of body, so 2 separate half-completed products was cast with width-type mould. The manufacturing techniques Using white cast iron structure, width-type mould are observable to the Iron Pot excavated from Sikrichong Ancient Tomb & Hwangnamdaechong grand Ancient Tomb around those were constructed the same time. It's able to recognize that it's almost identical manufacturing techniques at that time. Conservation is generically following those are survey of pretreatment, foreign material removal, stabilization, restoration and color matching in the order. cleaning & drying were added to the process as occasion demands. The strengthening treatment were difficult with artifact's volume, low concentration Paraloid NAD-10 solution was spread two or three times with a brush, surface hardening also came up with 15wt% Paraloid NAD-10 solution after the conservation was complete. There were connection & restoration for the restoration to the damage after modeling forms that it's similar to damaged parts by using the Fiber Reinforced Plastic resins(POLYCOAT FH-245, mold laminated type). Throughout this research, capitalizing on accumulations of measurements about the production technique of Iron Pot in the time of the fifth and 6th centuries is no less important than the Iron artifact's conservation for a better study in the future.