• Title/Summary/Keyword: Crushed Sand Concrete

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An Experimental study on the Manufacture and Mechanical Properties of concrete Utilizing Fly Ash and Crushed Sand (플라이애쉬와 부순모래를 이용한 콘크리트의 제조 및 역학적 특성에 관한 실험적 연구)

  • 박승범;오광진;호성수;강현선
    • Proceedings of the Korea Concrete Institute Conference
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    • 1995.10a
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    • pp.84-88
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    • 1995
  • The results of an experimental study on manufacture and mechanical properties of concrete utilizing crushed sand and fly ash for construction materials are presented in theis paper. As the results show, the workability, compressive strength and freezing-thaw resistance were improved by proper contents of fly ash, replaced crushed sand, and air entraining agent. And the drying shinkage was decreased by proper contents of those. Also, the suitable weight contents of replacing ratio of crushed sand and weight ratio fly ash in concrete using crushed sand were in range of 30% and 15% respectively.

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An Experimental Study on the Durability of Concrete with a Source of Supply of Sand (잔골재의 원산지에 따른 콘크리트의 내구특성에 관한 실험적 연구)

  • Park, Jong-Ho;Hong, Ji-Hun;Kim, Jung-Bin;Park, Se-Jong;Park, Chang-Su;Lee, Sung-Yeon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.137-140
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    • 2006
  • This study make an investigation into the quality of sand supplied with remicon manufacturing plant and examine concrete influenced by a source of supply of sand. As a result of the indoor test, the quality of crushed sand, EEZ sand and sand of north korea are worse than general sea sand. therefore, crushed sand, EEZ sand and sand of north sand lower quality of concrete.

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A Study on the Characteristics of Rapid-set concrete as to Fine aggregate Kinds (잔골재의 종류에 따른 초속경콘크리트의 특성에 관한 연구)

  • 정해동;강의주;이환우;장희석;김명식
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.417-422
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    • 2001
  • The purpose of this study is to investigate experimentally the workability, compressive and flexural strength properties of rapid-set concrete with various mixture. The kinds of fine aggregate(river sand, sea sand, crushed sand), water-cement ratio(40%, 45%, 50%), sand-aggrega to ratio(33%, 36%, 39%) were chosen as the experimental parameters. Test variables are temperature of concrete, slump, air contents, compressive and flexural strength. The compressive and flexural strength for 3 hours and 6 hours were tested. As result, it was shown that temperature of concrete involved 45$^{\circ}C$, some time later decreased. The workability were decreasing in steps as the sand-aggregate ratio increased and crushed sand was the highest value. Higher compressive and flexural strength was shown following the order of river sand, sea sand, crushed sand regardless of sand-aggregate ratio. But the values of gap was just a little.

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A Study on the Fracture Characteristicsof Crushed Sand Concrete and River Sand Concrete (강모래 및 부순모래 콘크리트의 파괴특성에 관한 연구)

  • 김진근;이칠성
    • Magazine of the Korea Concrete Institute
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    • v.7 no.4
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    • pp.129-136
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    • 1995
  • Thls research Includes est~mat~ons of the relat~on ktween the strength of concrete and the fracture energy for river sand concrete and crushed sand concrete using the wedge sphtting test method. Furthermore the fracture energy and the characteristic length of two types of concrete were compared and d~scussed. Fracture behaviors of crushed sand concrete and natural sand concrete had the similar trend in fracture characteristics. The fracture energy was increased with the increase of compressive strength in the strength range of 20-60MPa, but was not increased for the concrete more than 6OM.Pa of compressive strength.

The Influence of the Properties of Crushed Stone Sand on the Mixing Factor and Compressive Strength of Concrete (부순모래의 품질특성이 콘크리트의 배합인자 및 압축강도에 미치는 영향)

  • Hong Ji Hoon;Yum Jun Haun;Choi Jin Man;Jeong Yang;Lee Seong Yeun;Yeo Byung Chul
    • Proceedings of the Korea Concrete Institute Conference
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    • 2005.11a
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    • pp.623-626
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    • 2005
  • This study is aimed for investigating the influence of the properties of crushed stone sand on the mixing factor and compressive strength of concrete. The results of this study are as follows; The influence of Particle Shape and Very Fine Sand(VFS) of crushed stone sand on the mixing factor was higher than Fineness Modulus. The demand water of concrete with crushed stone sand was decreased about $12\~18kg/m^3$with increasing $4\%$ of Particle Shape and increased $8\~15kg/m^3$ with increasing $3\%$ of ratio of Very Fine Sand(VFS).

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Study on the Properties of Antiwashout Underwater Concrete with Variation of Mixing Proportion of Fine Aggregate Types (잔골재의 혼합비율 변화에 따른 수중불분리성 콘크리트의 특성에 관한 연구)

  • 배원만;박세윤;백동일;김명식
    • Proceedings of the Korea Concrete Institute Conference
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    • 2003.11a
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    • pp.533-536
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    • 2003
  • The objective of in this study makes investigation into the characteristics of antiwashout underwater concrete as to mix proportion, casting and curing water through experimental researches. in this study, sea sand is blended with river sand, crushed sand is blended with river sand and sea sand as to investigate the quality change and characteristics of antiwashout underwater concrete with variation of blend ratio of sea sand and crushed sand(0, 20, 40, 60, 80, 100%). Higher compressive strength is measured following the order of river sand, sea sand, crushed sand regardless of age and casting condition. Except for case of using river sand, blended ratio of 40% is appeared on most compressive strength.

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A Study on the Properties of High Flowing Concrete with Quality Variation of Crushed Sand (부순모래의 품질변화에 따른 고유공콘크리트의 특성에 관한 연구)

  • Choi, Il-Ho;Jung, Yang-Hee;Yum, Jun-Hwan;Choi, Jin-Man;Lee, Seong-Yeon;Hong, Kuung-Seon
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.81-84
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    • 2006
  • Currently, natural aggregates of good quality are hard to use because of continuous decrease of internal aggregate resource and regulation of gathering. So, use of crushed sand was being increased. On the other hand, skyscraper projects with 100 stories are being planned within the country and high strength concrete must be used to construct a skyscraper with 100 stories. High strength concrete is necessary to use crushed sand too because we are still unable to secure natural aggregates of good quality. So, This study indicated basic data necessary for mix design of high strength concrete through valuation of concrete property by quality variation of crushed sand.

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The Properties of Inter-Locking Block with the Variation of Particle Grading and Shape of Aggregate (골재의 입도와 입형 변화에 따른 인터로킹 블록의 특성)

  • 이상태;김기철;신병철;김진선;권상준;한천구
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04b
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    • pp.661-664
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    • 1998
  • In this paper, the properties of inter-lacking block by the kind of aggregate and fineness modulus are investigated. According to the experimental results, compressive strength and flexural strength increase and absorption ratio decrease with larger fineness modulus in the range of 2.15~4.20. Flexural strength with river sand is higher than that with crushed sand by about 19%, compressive strength with river sand, that with crushed sand by about 11% and absorption ratio with river sand is smaller than that with crushed sand by abort 2%.

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A Study on the Fluidity and Compressive Strength of HPC according to the Replacement Ratio of Crushed Sand (부순모래 대체율에 따른 고강도콘크리트의 유동특성 및 강도특성에 관한 연구)

  • Choi, Se-Jin;Kang, Won-Seok;Park, Chang-Soo;Lee, Seong-Yeon;Lee, Sang-Soo
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.437-440
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    • 2006
  • Generally, the strength of concrete depends on factors of materials, mix proportions, compaction, manufacturing methods and curing and so on. And recently, it has increased the using of crushed sand for concrete due to the exhaustion of good natural aggregate. This is an experimental study to compare and analyze the fluidity and compressive strength of ultra-high strength concrete according to the replacement ratio of crushed sand. For this purpose, the mix proportions of concrete according to the W/B ratio and replacement ratio of crushed sand was selected. And then air content, slump-flow, O-lot, compressive strength test were performed.

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Evaluation of Physical and Chemical Properties of Crushed Sand for Highway Construction (고속도로 건설현장에서 사용되는 부순모래의 물리적, 화학적 특성 평가)

  • Lee, Chan-Young;Shim, Jae-Won;Kim, Jin-Cheol;Lee, Byung-Duk
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.05b
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    • pp.141-144
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    • 2006
  • In this study, evaluation of physical and chemical properties of crushed sand was performed to establish optimal mix proportion standard for concrete using crushed sand afterward. Most of properties of crushed sand were satisfied with KS F 2527. Especially, chemical stabilities such as alkali-aggregate reaction were fairly good. However, considerable attention would be required in using crushed sand from lime stone judging from the result that weight loss of it was more than 23.8%. There were some differences in the properties with production region, stone type and capacity of facility, therefore it is thought that quality should be controled by optimal regulations for corresponding items.

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