• Title/Summary/Keyword: 경량 기포 콘크리트

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Adsorption Properties of Cellular Light-weight Concrete using Rice Husks (왕겨숯을 이용한 경량기포콘크리트의 흡착 특성)

  • Lee, Chang-Woo;Lee, Sang-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2021.05a
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    • pp.146-147
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    • 2021
  • An increase in carbon emissions leads to the problem of global warming and is an issue to be solved in other countries. The problem of carbon dioxide has many effects not only on global warming but also on people. According to the World Health Organization (WHO), 4.3 million people have died because harmful substances generated indoors cannot be discharged to the outside and accumulate in the human body through the respiratory tract. In response to this situation, in order to reduce the generation of pollutants in the building itself, soak into lightweight bubble concrete to adsorb and purify indoor pollutants, mix charcoal, investigate the appropriate amount and physical characteristics, and check carbon dioxide This is an experiment for grasping the adsorption capacity, and the results are as follows. As the replacement rate of rice husk charcoal increased, the compressive strength tended to decrease, and the carbon dioxide reduction rate tended to increase. It is judged that the charcoal of rice husks shows a low density and the physical adsorption is smooth due to the porous structure. Since it is excellent in the basic physical properties and carbon dioxide adsorption surface of this experiment, it is judged that it has sufficient potential for use as an indoor finishing material.

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Studies on the Production and Property of Light Weight Concrete (경량(輕量)콘크리트의 제조(製造)와 그 성질(性質)에 관(關)한 연구(硏究))

  • Kim, Seong Wan;Kang, Sin Up;Cho, Seong Seup;Sung, Chan Yong
    • Korean Journal of Agricultural Science
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    • v.10 no.2
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    • pp.310-323
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    • 1983
  • To study the effect of foaming agent on the production and property of light weight concrete, the tests of compressive, tensile, bending strengths and absorption rates of mortar were done under the different mixing ratio with J, A and D foaming agents. The results obtained were summarized as follows : 1. The strengths were decreased in richer mixing ratio and more addition of foaming agent. The decrease of strengths was the greatest at the level of 0.75% of foaming agent. The decreasing rate of strengths was in order of J, A and D foaming agent. 2. At the mixing ratio of 1:1, ${\sigma}_{28}$ and 0.75% of foaming agent, the compressive strength was decreased up to 34.9% by D, 47.8% by A and 86.8% by J foaming agent, respectively, the tensile strength was decreased up to 14.8% by D, 20.2% by A and 77.9% by J foaming agent, respectively, bending strength was decreased up to 19.9% by D, 35.0% by A and 79.1% by J foaming agent, respectively. The decrease of compressive strength was more severe than that of tensile and bending strengths. 3. The absorption rates were increased in poorer mixing ratio and more addition of foaming agent. The absorption rate was significantly higher at the early stage of immersed water. The absorption rate was in order of J, A and D foaming agent. 4. The decrease of strengths was inevitable in cement-mortar with foaming agent, but the cement mortar with foaming agent has such the properties of the light-weight, lnsulation, Keeping-warmth, sound proof and fire-proof that if could be utilized to the constructions which need low strengths.

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A Plan to guarantee quality of Light-weight Cellular Concrete for floating floor (뜬바닥용 기포콘크리트의 품질확보 방안)

  • 이성호;정갑철
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.938-943
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    • 2003
  • The characteristics of lightweight cellular concrete has much influence on the compressive strength and flow from the design of mixture. This study is to investigate the characteristics of the compressive strength and flow for the mixture of lightweight cellular slurry. KS F 4039 was compared to the construction system and quality for lightweight cellular comcrete of floating floor. As the result of this study, the standard of the compression strength for target slurry have to lower and an upper limit of flow was judged to be 230mm

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The Thermal Conduction Property of Structural Concrete using Insulation Performance Improvement Materials (단열성능향상 재료를 사용한 구조용 콘크리트의 열전도 특성)

  • Park, Young-Shin;Kang, Min-Gi;Kim, Jung-Ho;Ji, Suk-Won;Jeon, Hyun-Kyu
    • Journal of the Korea Institute of Building Construction
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    • v.16 no.1
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    • pp.9-15
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    • 2016
  • The part of a building with the biggest energy loss is the exterior and many studies are actively conducted to reduce the energy loss on that part. However, most studies consider the window frames and insulation materials, but many studies do not discuss the concrete that takes more than 70% of the exterior. In order to minimize the energy loss of buildings, it is necessary to enhance the concrete's insulation performance and studies need to be conducted on this. Therefore, this study used a micro foam cell admixture, calcined diatomite powder, and lightweight aggregates as a part of a study to develop a type of concrete with improved insulation performance that has twice higher thermal conductivity compared to concrete. It particularly secured the porosity inside concrete to lower thermal conductivity. As a result of the experiment, the slump and air capacity showed fair results, but all mixtures containing micro foaming agent showed 14.3~35.1% lower mass per unit of volume compared to regular concrete. Compressive strength decreased slightly due to the materials used to improve the insulating performance, but it all satisfied this study's target strength(24MPa). Thermal conductivity was up to twice higher than that of regular concrete.

A Study on the One Side Freezing /Thaw and Carbonation of Autoclaved Lightweight Concrete (경량기포콘크리트의 편면동결융해 및 탄산화에 관한 연구)

  • 노재성;황의환;홍성수;이범재
    • Magazine of the Korea Concrete Institute
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    • v.7 no.4
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    • pp.149-156
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    • 1995
  • The fracture process zone in concrete is a region ahead of a traction-free crack, in which two major mechanisms, microcracking and bridging, play important roles. The toughness due to bridging is dominant compared to toughness induced by microcracking, so that the bridging is dominani: mechanism governing the fracture process of concrete. Fracture mechanics does work for concrete provided that the fracture process zone is being considered, so that the development of model for the fracture process zone is most important to describe fracture phenomena in concrete. In this paper the bridging zone, which is a part of extended rnacrocrack with stresses transmitted by aggregates in concrete, is modelled by a Dugdale-Barenblatt type model with linear tension-softening curve. Two finite element techniques are shown for the analysis of progressive cracking in concrete based on the discrete crack approach: one with crack element, the other without crack element. The advantage of the technique with crack element is that it dees not need to update the mesh topology to follow the progressive cracking. Numerical results by the techniques are demonstrated.

Strength Variations of Light Weight Foamed Concrete According to the Autoclaving Time (오토클레이브 양생시간에 따른 경량기포콘크리트의 강도 변화에 관한 실험적 연구)

  • Kang Cheol;Kang Gi Woong;Kang Eun Gu;Noh Jea Myoung;Kwon Gi Ju;Kim Jin Man
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2005.05a
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    • pp.57-60
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    • 2005
  • This is the experimental study on the strength development of the light weight concrete block according to the autoclaving time. The calcareous source used the cement, siliceous material used the bottom ash ground to fine particle, and the PP fiber used to increase toughness. The results of this experiment are as follows. According to the increase of autoclaving time and the fiber content, compressive and flexural strengths are increased. Despite of the changes of the autoclaving time, tobermorite was produced on each of the specimens. However, the phase of tobermorite was changed in accordance with the changes of autoclaving time.

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Durability of Concrete Using Insulation Performance Improvement Materials (단열성능 향상 재료를 사용한 콘크리트의 내구성에 관한 연구)

  • Park, Young-Shin;Kim, Jung-Ho;Kim, Se-Hwan;Kim, Sang-Heon;Jeon, Hyun-Kyu
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.3
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    • pp.22-29
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    • 2015
  • In this study, we tested to develop and apply structural insulation performance improvement concrete to field, which had compressive strength in 24 MPa and thermal conductivity twice as much as normal concrete. After experiment about slump and air contents, combination product of Plain and calcined diatomite powder showed reduction of slump and air contents and combination product with micro foam cell admixture, we cannot find result of slump and air contents reduction. Unit weight of combination product with insulation performance improvement materials decreased more than that of Plain. In the test of compressive strength, compressive strength of insulation performance improvement concrete decreased more than that of Plain but was content with 24 MPa. thermal conductivity of insulation performance improvement concrete tended to decrease. Freezing and thawing resistance of insulation performance improvement concrete was similar to that of Plain. In carbonation resistance test, combination product with calcined diatomite powder showed the result which was similar to that of Plain. In carbonation resistance test, combination product with micro foam cell admixture showed a increase compared to that of Plain and length variation of combination product generally increased.

Improvement of Strength Characteristics in ALC added Silica Powder and Gypsum (규석 분말 및 석고 혼입에 따른 경량기포콘크리트의 강도특성 개선)

  • Song, Hun;Chu, Yong-Sik;Lee, Jong-Kyu
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.7 no.4
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    • pp.128-135
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    • 2012
  • Autoclaved lightweight concrete, also known as autoclaved aerated concrete(AAC) or autoclaved cellular concrete (ACC), is made with fine silica powder, quik lime, cement, and an Al powder. ALC contains 70~80% air. The lightweight material offers excellent sound and thermal insulation, and like all cement-based materials, is strong and fire resistant. However, ALC have high water absorption, low compressive strength and popout the origin of the low surface strength in its properties. These properties make troubles under construction such as cracking and popout. Thus, this study is to improve the fundamental strength by controls of increasing of admixtures, gypsum and silica powder size. Admixtures make use of metakaolin and silica fume. From the test result, the ALC using admixture have a good fundamental properties compared with plain ALC. Compressive strength, specific strength and abrasion's ratio were improved depending on increasing admixtures ratio's, gypsum and silica powder size.

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Prediction Model of Flexural Properties of LEFC using Foaming Agent (기포제 적용 빛 감성 친화형 콘크리트의 휨 특성 예측 모델)

  • Kim, Byoung-Il;Seo, Seung-Hoon
    • Journal of the Korea Institute of Building Construction
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    • v.19 no.1
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    • pp.9-18
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    • 2019
  • Concrete, which is the most widely used building material in modern times, has been improved not only in strength but also in structural performance such as increase in toughness and ductility, weight reduction, and improvement in quality of human life. Due to the surge in demand for the building, there is a tendency to be used variously from architectural panel and architecture to interior accessories. In Korea, a light-transmitting concrete, LEFC(Light Emotion Friendly Concrete), that insert plastic rods to stimulate emotional sensation through the combination of light and concrete has developed. In previous research, it was confirmed that the use of a synthetic foam agent rather than an animal foam agent did not cause a fogging phenomenon. In this study, lightweight by applying foaming agent to LEFC and two types of fiber (Nylon Fiber, Polyvinyl Alcohol) were compared to achieve to investigate the fiber to be applied in future. An equation that can predict the loss and adhesion reduction of the concrete section according to the diameter of the rod (5mm, 10mm) and the interval (10mm, 15mm, 20mm) was proposed.

Properties of the Spalling and Fire Resistance on the High Strength RC Column attached with the Stone Panel Using Lightweight Foamed Concrete (경량기포 콘크리트를 이용한 석재패널 부착 고강도 RC 기둥의 내화 및 폭렬특성)

  • Lee, Dong-Gyu;Beak, Dea-Hyun;Kim, Won-Ki;Jo, Yong-Beak;Han, Min-Choel;Han, Choen-Goo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2007.11a
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    • pp.19-22
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    • 2007
  • This study discussed the prevention of the spalling and improvement of the fire resistance performance how to fill up lightweight foamed concrete on high strength RC column attached with the stone panel. The destructive spalling extremely occur caused by sudden high temperature and increased vapor pressure corresponding to falling the ston panel at all RC column, and the steel bar is exposed. The stone panel fall off about 30 minutes and spalling occur about 70 minutes on Plan RC column, fire endurance paint, and fire endurance mortar, so it can be confirmed that fire endurance paint and mortar, which is used as fire endurance material, are not effective. In the other side, it can be protected from fire about $120{\sim}140$ minutes when the lightweight foamed concrete is used as fire endurance material. For the weight loss after the fire test, plain is 33, fire endurance paint is 37%, and fire endurance mortar s 40.7%. And W/B 60%-3 is 53.4%, 60%-1.5 is 40.1%,65%-3 is 39.4%, and 65%-1.5% is 47.1. Overall, the weight loss of the plain is lower than that of the lightweight foamed concrete.

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