• Title/Summary/Keyword: normal strength concrete wall

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A Study on Construction Quality Inspection of Field use Concrete (현장 타설용 콘크리트의 시공품질 검토를 위한 연구)

  • 김민석;강병훈;강태경;박선길;이종균;정상진
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.10b
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    • pp.1057-1062
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    • 2000
  • The purpose of this study is to practice the method which can estimate 28-days strength of concrete in advance. This method is made for reliant quality control. Based on existing experiment, concrete that flyash added and normal concrete are placed into wall structure, and it is examined the difference between experiment use concrete and field use concrete. The result of this study are as follows : 1) Core test specimen have 10% lower strength to standard curing specimen. 2) At 28-days accelerated strength by microwave, average 35% in normal concrete, average 23% in flyash added concrete. 3) At coefficient of determination between compressive strength and accelerated strength, 0.84 in normal concrete core, 0.86 in standard curing normal concrete, 0.86 in flyash added concrete, 0.90 in standard curing flyash added concrete.

An Experimental Study on the High-Strength Concrete Shear Wall using Rectangular Steel Tubes (각형강관을 사용한 고강도 콘크리트 전단벽체에 대한 실험적 연구)

  • 최기봉;조순호;김명준;오종환
    • Proceedings of the Korea Concrete Institute Conference
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    • 1997.04a
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    • pp.460-467
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    • 1997
  • Compared to normal-strength concrete, high-strength concrete has the lower lateral expansion capacity caused by the higher elastic modulus and the lower internal crack characteristic. Therefore, the effect of the lateral confining action of hoops appears slowly and also in inefficient Nevertheless. it has been reported that the strength and deformation capacity of high-strength concrete is improved by well-distributed hoops. Due to that argument, this investigation has been compared and analyzed by the experimental works on the deformation capacity and the confinement mechanism of high-strength concrete shear wall of the high-rise building reinforced by rectangular steel tubes and rectangular hoops at both edges of the shear wall.

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The Development of Normal Strength-High Fluidity Concrete to Improve Compaction of Concrete Wall and Flatness of Slab (충전성 및 평탄도 개선을 위한 일반강도 중유동 콘크리트 개발)

  • Kim, Yong-Ro;Park, Jong-Pil;Kim, Rae-Hwan
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.04a
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    • pp.55-56
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    • 2022
  • Recently, water leak is increasing due to poor compaction or segregation of concrete on external wall. In addition, the flatness quality of the slab is lowered due to the deterioration of the workability of concrete. In this study, the performance of high fluidity concrete of 21MPa using a polycarboxylate-based superplasticizer was evaluated to improve the compaction and quality of the concrete wall.

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Effects of High-Strength Concrete Shear Walls with Rectangular Steel Tubes (고강도 콘크리트 전단벽체에 사용된 각형강관의 효과)

  • Kim, Myung-Jun;Oh, Jong-Han;Cho, Soon-Ho;Choi, Ki-Bong;Cho, Chul-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.2 no.2
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    • pp.209-217
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    • 1998
  • Compared to normal-strength concrete, high-strength concrete has the lower lateral expansion capacity caused by the higher elastic modulus and the lower internal crack characteristic. Therefore, the effect of the lateral confining action of hoops appears slowly. Nevertheless, it has been reported that the strength and deformation capacity of high-strength concrete is improved by well-distributed hoops. Due to that argument, this investigation has been compared and analyzed by the experimental works on the deformation capacity and the confinement mechanism of high-strength concrete shear wall of the high-rise building reinforced by rectangular steel tubes and rectangular hoops at both edges. It is suggested that, using high-strength concrete($500kgf/cm^2$, $700kgf/cm^2$), hoops should be replaced with rectangular steel tubes in order to prevent closely spaced hoops at the edge of the shear wall.

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Strength and behaviour of reinforced SCC wall panels in one-way action

  • Ganesan, N.;Indiraa, P.V.;Prasad, S. Rajendra
    • Structural Engineering and Mechanics
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    • v.36 no.1
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    • pp.1-18
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    • 2010
  • A total of 28 wall panels were cast and tested under uniformly distributed axial load in one-way in-plane action to study the effect of slenderness ratio (SR) and aspect ratio (AR) on the ultimate load. Two concrete formulations, normal concrete (NC) and self compacting concrete (SCC), were used for the casting of wall panels. Out of 28 wall panels, 12 were made of NC and the remaining 16 panels were of SCC. All the 12 NC panels and 12 out of 16 SCC panels were used to study the influence of SR and the remaining 4 SCC panels were tested to study the effect of AR on the ultimate load. A brief review of studies available in literature on the strength and behaviour of reinforced concrete (RC) wall panels is presented. Load-deformation response was recorded and analyzed. The ultimate load of SCC wall panels decreases non-linearly with the increase in SR and decreases linearly with increasing values of AR. Based on this study a method is proposed to predict the ultimate load of reinforced SCC wall panels. The modified method includes the effect of SR, AR and concrete strength.

Shear response estimate for squat reinforced concrete walls via a single panel model

  • Massone, Leonardo M.;Ulloa, Marco A.
    • Earthquakes and Structures
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    • v.7 no.5
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    • pp.647-665
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    • 2014
  • Squat reinforced concrete walls require enough shear strength in order to promote flexural yielding, which creates the need for designers of an accurate method for strength prediction. In many cases, especially for existing buildings, strength estimates might be insufficient when more accurate analyses are needed, such as pushover analysis. In this case, estimates of load versus displacement are required for building modeling. A model is developed that predicts the shear load versus shear deformation of squat reinforced concrete walls by means of a panel formulation. In order to provide a simple, design-oriented tool, the formulation considers the wall as a single element, which presents an average strain and stress field for the entire wall. Simple material constitutive laws for concrete and steel are used. The developed models can be divided into two categories: (i) rotating-angle and (ii) fixed-angle models. In the first case, the principal stress/strain direction rotates for each drift increment. This situation is addressed by prescribing the average normal strain of the panel. The formation of a crack, which can be interpreted as a fixed principal strain direction is imposed on the second formulation via calibration of the principal stress/strain direction obtained from the rotating-angle model at a cracking stage. Two alternatives are selected for the cracking point: fcr and 0.5fcr (post-peak). In terms of shear capacity, the model results are compared with an experimental database indicating that the fixed-angle models yield good results. The overall response (load-displacement) is also reasonable well predicted for specimens with diagonal compression failure.

Applications and Analysis of Exterior Paints for the Curtain Wall Panel System based on the Autoclaved Lightweight Concrete(ALC) (경량기포콘크리트(ALC) 패널을 건축물 외장 커튼월에 적용을 위한 도료의 기초적 연구)

  • Lee, Yong-Soo;La, Hyun-Ju
    • Journal of The Korean Digital Architecture Interior Association
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    • v.12 no.3
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    • pp.59-66
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    • 2012
  • Autoclaved Lightweight Concrete(ALC) features such as a high performance insulation, the fire resistance, the advantage of easy handing construction, and lightweight panels applied the curtain wall system. ALC materials are certified as non-toxic environmental and eco-friendly productions. But ALC external panels mixed with blast furnace slag pounder and silica fume have to be coated with a stucco compound or plaster because of resisting the ambient environment. This study is that mixing tests to evaluate a performance analysis of exterior paints to be make-up pigments(organic or inorganic) coated with panel surface. Testing compared by KS F 2476; flow test, KS F 2426; compression strength test, KS F 2762; bond strength test. In results, the case of the inorganic binder, ratio of alumina cement : anhydrite is 90:10 to 80:20 at the highest level of intensity. In the case of the organic binder, adhesive strength rating at surface of ALC, the pullout strength is below 0.5 $N/mm^2$ but the normal concrete is over 2.0$N/mm^2$. A contents ratio of EVA resin is more than 3% and then bond strength is effectively.

Structural Performance of RC Slab-Wall Joints Reinforced by Welded Deformed Steel Bar Mats (철근격자망을 사용한 슬래브-벽체 접합부의 구조성능)

  • Park, Seong-Sik;Yoon, Young-Ho;Lee, Bum-Sik
    • Land and Housing Review
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    • v.2 no.1
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    • pp.61-68
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    • 2011
  • In order to clarify the structural performances of Welded Deformed Steel Bar Mats (WDSBM), the research stated includes the tests for standard hook of top bars of slab in concrete slab-wall joints, the tests for embedment length of top bar of slab, and the development strength tests for standard hook. The test results are as follows; (1) For slab-wall joints using WDSBM as reinforcement in slab, if the top bars of WDSBM are spliced by ordinary bars with sufficient development length and size, it is enough for the strength and crack control. (2) When WDSBM of slab is spliced in joint, the strength is increased with the embedment of bars of this WDSBM into wall. Beyond peak strength, however, ductility is diminished to that as no splice due to pull-out failure. (3) For slab-wall system, ultimate strain of concrete for flexural compression zone in lower surface of slab seems much greater than that of normal concrete beam. The reason is that normal concrete beam has the joint with $180^{\circ}$, however slab-wall joint has the $90^{\circ}$ of which concrete can be confined.

An Experimental Study on the Mechanical Properties of No-Fines Concrete (No-Fines Concrete의 역학적 특성에 관한 실험적 연구)

  • 홍건호;정일영
    • Magazine of the Korea Concrete Institute
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    • v.6 no.3
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    • pp.190-200
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    • 1994
  • The purpose of this research is to examine experimentally the mechanical properties and economics of No-fines concrete for its application to the low-rise housing construction. Basic mechanical properties of No fines concrete are studied by measuring of compressive, tensile strength and stress-strain relationship, and economics of it is compared with other materials in unit cost and wall construction cost. From the test results, it can be concluded that No-fines concrete has advantages of good workability, light weight and lower construction cost, even though it has lower strength and modulus of elasticity than normal conc:rt:te does.

Hysteretic Behavior of Wide Beam-Column joint (외부 넓은 보-기둥 접합부의 이력거동에 관한 연구)

  • Seo Soo-Yeon;Kim Jong-Sun;Yoon Yong-Dae;Lee Woo-Jin;Kim Sang-Sik;Yoon Seung-Joe
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.623-626
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    • 2004
  • The purpose of this paper is to study the effect of longitudinal reinforcement for anchoring in the wide beam column joint as wall as the contribution of depth of spandrel beam to hysteretic behavior of the wide beam column joint. From the test it was shown that the specimen with anchorage in the joint had higher strength than the specimen with normal hook anchorage. Specimen with debonded reinforcement at out of Id from column face failed showing moved plastic hinge and less strength than normal specimen. However, the dissipated energy was increased $11\%$.

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