• Title/Summary/Keyword: Optimum Mix

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A study on the mix desing for stabilizing liquid of sluryy wall (Slury Wall용 안정액의 배합설계에 관한 연구)

  • ;;;Motoshige Ariyama
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.457-462
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    • 1999
  • The purpose of this study is to design the requirements for the materials of stabilizing slurry and to determine the optimum slruuy mix design used in the underground wall of Inchon LNG #213 and 214 tank. After the materials and mix conditions of stabilizing slurry investigated and tested, we propose materials and optimum mix design according to testing items including funnel viscosity, we propose materials and optimum mix design according to testing items including funnel viscosity, fluid loss, cake thickness and specific gravity. As this results, we select optimum mix design that the upper limit ratio of bentonite is 2.0%, polymer is 0.1% considering the funnel viscosity and dispersion agent is 0.05% considering the fluid loss. Also we select all materials which are composed of GTC4 as bentonite, KSTP as polymer and Bentocryl as dispersion agent. All test results are satisfied our specifications for stabilizing slurry.

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The Optimum Mix Design of 40MPa, 60MPa High Fluidity Concrete using Neural Network Model (신경망 모델을 이용한 40MPa, 60MPa 고유동 콘크리트의 최적배합설계)

  • Cho, Sung-Won;Cho, Sung-Eun;Kim, Young-Su
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.223-224
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    • 2021
  • Recently, the demand for high fluidity concrete has been increased due to skyscrapers. However, it has its own limits. First of all, high fluidity concrete has large variation and through trial & error it costs lots of money and time. Neural network model has repetitive learning process which can solve the problem while training the data. Therefore, the purpose of this study is to predict optimum mix design of 40MPa, 60MPa high fluidity concrete by using neural network model and verifying compressive strength by applying real data. As a result, comparing collective data and predicted compressive strength data using MATLAB, 40MPa mix design error rate was 1.2%~1.6% and 60MPa mix design error rate was 2%~3%. Overall 40MPa mix design error rate was less than 60MPa mix design error rate.

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Optimum Mix Design of Concrete (콘크리트 용도별 최적배합을 위한 연구)

  • 이병덕;양우석;안태성
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.209-214
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    • 1999
  • Strength provisions in Korea Concrete Institute code are more conservative that those in ACI code by increasing load factors and decreasing capacity reduction factors. Cement content of mix design in construction field is usually higher than the modified for standard deviation because of rigorous inspection. Higher cement content increases not only strengths but also heat of hydration, shrinkage and brittleness which are not beneficial. To reduce and optimize the cement content in current mix design of Korean Highway Corporation, properties of fresh and hardened concrete for 16 different mix proportions have been investigated. It is found that the chemical admixture and cement of current mix proportions for highway construction are somewhat higher than the optimum amount. Therefore, the optimum mix design for 16 different purposes has been proposed.

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Optimum Mix Proportion and Mechanical Properties of Rain Garden Structure Concrete using Recycled Coarse Aggregate, Hwang-Toh, Blast Furnace Slag and Jute Fiber (순환굵은골재, 황토, 고로슬래그 미분말 및 마섬유를 사용한 레인가든 구조물 콘크리트의 최적배합설계 및 역학적 특성)

  • Kim, Dong-Hyun;Park, Chan Gi
    • Journal of The Korean Society of Agricultural Engineers
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    • v.55 no.3
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    • pp.25-33
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    • 2013
  • In this study, the optimum mix proportions of rain garden structure concrete were decided and the mechanical properties were evaluated. Experimental parameters were blast furnace slag, hwang-toh, recycled aggregates and natural jute fibers. The target compressive strength and chloride ion penetration were more than 24 MPa and less than 1000 coulombs, respectively. The response surface method was used for statistical optimization of experimental results. The optimal mixing ratios of the blast furnace slag, hwang-toh, recycled coarse aggregate and jute fiber volume fraction were determined 59.98 %, 8.74 %, 12.12 % and 0.2 %, respectively. The compressive strength, flexural strength and chloride ion penetration test results of optimum mix ratio showed that the 24.56 MPa, 3.88 MPa and 999.08 columbs, respectively.

A Study on the Optimum Mix Proportion of the Stabilizing Liquid Used for Excavation of the Deep and Massive Slurry Wall

  • Kwon Yeong-Ho
    • KCI Concrete Journal
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    • v.14 no.4
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    • pp.151-159
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    • 2002
  • This study investigates experimentally the optimum mix proportion and design factors of the stabilizing liquid used for excavation of the massive and deep slurry wall in LNG in-ground tank before pouring concrete. Considering those site conditions, the stabilizing liquid used for excavation of slurry wall has to be satisfied with some requirements including specific gravity, fluid loss, cake thickness, funnel viscosity and sand content in order to construct the safe and qualified slurry wall. For this purpose, we select materials including bentonite, polymer and dispersion agent. After performing many tests for materials and mix design process, we propose the optimum mix proportion that the upper limit ratio of bentonite is $2.0\%$, polymer is $0.1\%$ considering the funnel viscosity and dispersion agent is $0.05\%$considering the fluid loss of the stabilizing liquid. Also, we select all materials which are consisted of GTC4 as bentonite, KSTP as polymer and Bentocryl 86 as dispersion agent. Based on the results of this study, the optimum mix proportion of the stabilizing liquid is applicable to excavate the deep and massive slurry wall in LNG in-ground tank successfully.

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Laboratory and Field Model Study on the Optimum Mix of Shotcrete in Tunnel Construction (터널의 SHOTCRETE 최적배합에 관한 실내 및 현장 모형 실험 연구)

  • 오병환;박칠림;백신원;장성욱
    • Magazine of the Korea Concrete Institute
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    • v.6 no.4
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    • pp.131-140
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    • 1994
  • Recently, tunnels are increasingly constructed in this country with the increased construction of highways, high-speed railways and subways. Shotcreting is one of the major processes in the tunnel construction. Many problems, however, exist in the current shotcreting practice. The purpose of the present study is, therefore, to explore the problems in the current shotcreting practice, to derive an optimum mix for efficient shotcreting, To this end, extensive experimental study has been conducted. Optimum mixes with high quality and economy were derived. The present study provides a firm bast: in our country to apply high-quality shotcrete in tunnel construction.

Optimum Technique for Concrete Mix-proportion Considering the Region Characteristics of Database (데이터베이스의 영역 특성을 고려한 콘크리트 최적 배합 선정 기법)

  • Lee, Bang-Yeon;Kim, Jae-Hong;Kim, Jin-Keun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.621-624
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    • 2006
  • This paper presents a novel optimum technique for optimum mix-proportion using database-based prediction model of material properties for an object function or a constraint condition. The proposed technique provides high reliability of results introducing effective region model, which assesses whether the prediction model is effective or not, in optimization process. In order to validate the proposed technique, a genetic algorithm was adopted as a optimum technique, and an artificial neural network was adopted as a prediction model for material properties and as a model for assessing effective region. The mix-proportion obtained from the proposed technique is more reasonable than that obtained from a general optimum technique.

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Performance Evaluation of 100 % RAP Asphalt Mixtures using different types of Rapid-Setting Polymer-Modified Asphalt Emulsion for Spray Injection Application (속경성 바인더 유형에 따른 긴급보수용 스프레이 패칭 상온 재활용 아스팔트 혼합물(RAP)의 성능 평가)

  • Kim, Doo Yeol;Jeon, Ji Seong;Lee, Sang Yum;Rhee, Suk Keun;Kwon, Bong Ju
    • International Journal of Highway Engineering
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    • v.19 no.2
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    • pp.75-85
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    • 2017
  • PURPOSES : The purpose of this study was to determine the optimum mix design of the content of 100 % reclaimed asphalt pavement (RAP) for spray injection application with different binder types. METHODS : Literature review revealed that spray injection method is the one of the efficient and economical methods for repairing a small defective area on an asphalt pavement. The Rapid-Setting Polymer modified asphalt mixtures using two types of rapid setting polymers-asphalt emulsion and a quick setting polymer asphalt emulsion-were subjected to the following tests to determine optimum mix designs and for performance comparison: 1) Marshall stability test, 2) Retained stability test, 3) Wet track abrasion test, and 4) Dynamic stability test. RESULTS and CONCLUSIONS : Type A, B, and C emulsions were tested with different mix designs using RAP aggregates, to compare the performances and determine the optimum mix design. Performance of mixtures with Type A emulsion exceeded that of mixtures with Type B and C emulsion in all aspects. In particular, Type A binder demonstrated the highest performance for WTAT at low temperature. It demonstrated the practicality of using Type A mixture during the cold season. Furthers studies are to be performed to verify the optimum mix design for machine application. Differences in optimum mix designs for machine application and lab application will be corrected through field tests.

A study on the Development of the Mix Design System for High-Strength Concrete. (고강도 콘크리트의 배합설계 시스템 개발에 관한 연구)

  • 오호진;장판기;박훈규;장일영
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04b
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    • pp.719-724
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    • 1998
  • It is proposed in this paper to develop the rational mix design system of High-strength concrete which is adjusted in the domestic circumstances. 1) Collect a lots of data in order to introduce the optimum mix design which has relation among material variables which compose High-strength concrete and run by using SAS (Statistical analysis system) which is one of multivariate statistical analysis method. 2) Select the important material variables for mix design of High-strength concrete by major component analysis and propose the standard range of each material variable along the target strengths. From the results of this study, it was proposed the range of proper material variables in domestic circumstance, which are W/C, S/A, air and admixture amounts, etc, at the target strengths for concrete kind. Also it was developed the optimum mix design program of High-strength concrete according to target strength and size of aggregate and made mix design ease in domestic construction site.

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The Study on the Optimum Mix Design of the High-Strength Concrete in Site (고강도 콘크리트의 현장최적배합에 관한 연구)

  • Lee, Sang-Soo;Won, Cheol;Kim, Dong-Seok;Ahn, Jae-Hyun;Park, Chil-Lim
    • Proceedings of the Korea Concrete Institute Conference
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    • 1996.10a
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    • pp.232-238
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    • 1996
  • In this paper, the properties of high-strength concrete are described with respect to materials and mix conditions(water-cement ratio, chemical admixture, replacement of fly ash). As primary purposes of this study, the optimum mix design method of high-strength concrete to decrease unit cement contents is investigated, and the properties of fresh and hardened concretes are tested in terms of slump, air content and compressive strength. As results of this study, workability and strength development of the high-strength concrete depend on the water-cement ratio, replacement ratio of fly ash and dosage of the chemical admixture. The conditions which are proposed optimum mix design of the high-strength concrete show W/C 37%, S/A 42~45% and unit cement content 470~480kg/$\textrm{m}^3$. Based on the results, the applicability of high-strength concrete in site is clearly proved.

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