• Title/Summary/Keyword: Crushed sand ratio

Search Result 112, Processing Time 0.034 seconds

An Experimental Study on the Engineering Properties and B.P Test of Ready Mixed Concrete Using EEZ Sand and Crush Sand (부순모래와 EEZ모래를 혼합사용한 레미콘의 B.P실험 및 공학적 특성에 관한 연구)

  • Shin, Seung-Bong;Kim, Young-Sun;Kim, Young-Duck;Lee, Sung-Yon;Kim, Gyu-Yong;Kim, Moo-Han
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2006.05b
    • /
    • pp.105-108
    • /
    • 2006
  • Recently, trouble of sand supplying is occurred according to exhaustion of natural sand resources. Therefore various measures are proposed for solution of trouble of sand supply and crushed sand among measures is used as one of most universal measures. But because crushed sand have poor particle shape and plenty of mikes micro particle, the quality of concrete using crushed sand deteriorated. Therefore, this study evaluated engineering property of concrete with replacement ratio of crushed sand and EEZ sand applied evaluation result to fundamental data for quality control of concrete using crushed sand and EEZ sand and The result of this study have shown that quality of concrete using crushed sand and EEZ sand and The compressive strengh of concrete up to 50, 70% EEZ sand replacement by crush sand, nearly equal to that of general sand.

  • PDF

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
    • /
    • 1998.04b
    • /
    • pp.661-664
    • /
    • 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%.

  • PDF

Properties of Quality & Mortar Application of Crushed Sand According to the Producing Type (생산 방식에 따른 부순 모래의 특성 및 모르타르 적용성)

  • Baek Chul Woo;Park Cho Bum;Kim Jung Sik;Ryu Deuk Hyun
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2005.11a
    • /
    • pp.443-446
    • /
    • 2005
  • Recently, according to increase use of concrete which is the main material of construction, the natural aggregate of good quality is more and more decreased. Most of all, among the concrete materials, the development of alternation materials of sand is urgently needed. In this study, investigating the production equipment and the sample of crushed sand company and analyzing properties of sand, manufactured mortar by the KS to use crushed sand as the fine aggregate of concrete material. The experiment result is as follows. 1. The density, an absorptivity, and the amount of 0.08mm passage ratio of crushed sand, and the mortar used crushed sand satisfied KS. The mechanical results is similar to sea sand. 2. The crushed sand which used impact crusher instead of cone crusher for 3rd or 4th crusher was similar properties to sea sand, so it is judged that impact crusher has high effect of particle shape improvement of crushed sand.

  • PDF

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
    • /
    • 2001.11a
    • /
    • pp.417-422
    • /
    • 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.

  • PDF

A Study on Physical Properties of Concrete Using Crushed Sand which Using Ratio and Changing Fineness Modules (부순모래의 사용비율 및 조립율 변화에 따른 콘크리트의 물리적 특성에 관한 연구)

  • Park, Young-Shin;Nam, Sung-Woo;Park, Jae-Myung
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 2006.11a
    • /
    • pp.497-500
    • /
    • 2006
  • In this paper, study on applicability and quality control of the concrete using crushed sand. Recently, Trouble of sand supply is occurred according to exhaustion of natural sand resources. Now, application of crushed sand are proposed for solution of trouble of sand supply. Therefore, this study evaluated properties of concrete using crushed sand which mixing rate and changing FM.

  • PDF

An Experimental Study on the Physical Properties of Mortar Using Crashed Sand (부순모래를 활용한 모르타르의 기초물성에 관한 실험적 연구)

  • Park Jong-Ho;Moon Hyung-Jae;Na Chul-Sung;Choi Se-Jin;Lee Sung-Yun;Kim Moo-Han
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2005.05a
    • /
    • pp.73-76
    • /
    • 2005
  • Recently, Trouble of sand supply is occurred according to exhaustion of natural sand resources. therefore, various measures are proposed for solution of trouble of sand supply and crushed sand among measures is used as one of most universal measures. but crushed sand which have poor particle shape and plenty of makes micro particle the qualify of concrete deteriorated. Therefore, this study evaluated physical properties of mortar using crushed sand and applied evaluation result to fundamental data The result of this study have shown that quality of mortar using crushed sand independently is poor against general mortar. but, mortar flow and compressive strength is increased in case of using crushed sand according to mixing ratio properly.

  • PDF

An Experimental Study on the Engineering Property and Durability of Concrete With Replacement Ratio of Crushed Sand (부순모래 대체율에 따른 콘크리트의 공학적 특성 및 내구성에 관한 실험적 연구)

  • Park Jong-Ho;Lee Dong Heck;Na Chul-Sung;Kim Jae-Hwan;Kim Gyu Yong;Kim Moo-Han
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2005.11a
    • /
    • pp.63-66
    • /
    • 2005
  • Recently, Trouble of sand supply is occurred according to exhaustion of natural sand resources. therefore, various measures are proposed for solution of trouble of sand supply also the government settled trouble of sand supply through application of crushed sand. but because both crushed sand are poor against general sand, they lead to lowering of qualify of ready-mixed concrete. Therefore, this study evaluated engineering property and durability of concrete using crushed sand and applied evaluation result to fundamental data for quality control of concrete using crushed sand. The results of this study have shown that quality of concrete using crushed sand independently is poor against general concrete. but, the workability, compressive strength and durability of concrete mixed crushed sand with genera can improve on those of concrete used general sand.

  • PDF

An Experimental Study on the Mechanical Properties of Concrete Utilizing Crushed Sand and Very Fine Sand (부순모래와 석분을 사용한 콘크리트의 역학적 특성에 관한 실험적 연구)

  • 박승범;오광진;박병철;강형선
    • Proceedings of the Korea Concrete Institute Conference
    • /
    • 1996.04a
    • /
    • pp.7-11
    • /
    • 1996
  • The results of an experimental study on the mechanical properties of concrete utilizing crushed sand for construction materials are persented in this paper. As the results show, the workability, compressive strength and drying shrinkage were improved by propeer contents of replaced crushed sand. And the workability, compressive strength and drying shinkage were decreased by increasing very fine sand. Also, the suitable weight contents of replacing ratio of crushed sand in concrete using crushed sand were in range of about 30%. And the use of crushed sand containing very fine sand under the permitted limit by regulated KS F 2558 has not very much problems in concrete.

  • PDF

A Study on the Engineering Properties of Ultra High-Strength Concrete Utilizing Crushed Sand (부순모래를 사용한 초고강도 콘크리트의 공학적 특성에 관한 연구)

  • Lee, Sang-Soo;Rho, Hyoung-Nam;Song, Ha-Young
    • Journal of the Korea Institute of Building Construction
    • /
    • v.8 no.4
    • /
    • pp.45-51
    • /
    • 2008
  • Recently, the demand of ultra high-rise building is on the increase in korea due to the rapidly changing movement in economic growth and the expansion of national infrastructure. At the same time, the tendency toward the amount used of concrete has greatly increased every year. In addition, as the seriousness of quantity demanded of aggregate is gathering strength, the active areas of research proceeds to do actively in every place in order to review the usability of crushed sand as a part of the countermeasures. And, it needs to establish the quality standard and service guide, etc. for the practical use. Accordingly, this study was to establish the ratio of water-binder materials as three levels like 23.5, 27.5, and 31.5%, and the replacement ratio as three levels like 0, 50, and 100% in order to define the engineering properties of ultra high-strength concrete using the crushed sand. This study was to examine it after establishing the combined condition by the substitute of the fine aggregate percentage and admixture. From the result of this research above, it may be summed up as follows. 1) The more the replacement ratio of crushed sand and the ratio of water-binder materials increased, the mon the fluidity decreased due to the decrease of irregular grain shape of sand and unit combined discretion. 2) This study found out that 100% of replacement ratio of crushed sand was almost similar level to the compressive strength of concrete using the natural sand.

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
    • /
    • 1995.10a
    • /
    • pp.84-88
    • /
    • 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.

  • PDF