• Title/Summary/Keyword: Porous Concrete

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An Experimental Study on the Evaluation of Physical Properties of Planting Porous Concrete using Industrial By-products. (산업부산물을 이용한 식생용 포러스콘크리트의 물성평가에 관한 실험적 연구)

  • Park, Seung-Bum;Lee, Taek-Woo;Kwon, Hyuk-Joon;Lee, Bong-Chun;Lee, Jun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2001.11a
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    • pp.929-934
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    • 2001
  • As the notion of environment protection changes throughout the world, construction engineers, as part of the effort to resolve environmental problems, have been actively doing research on environmental friendly porous concrete using large and non-uniform aggregate. Concrete having a great deal of continuous porosity enable water and air to pass freely through firmly hardened material, allowing necessary nutrients to reach roots of vegetation, thereby sustaining them. It is possible to prevent the exhaustion of natural resources by recycling waste concrete and industrial by-products, to reduce damage caused by the destruction of nature through effective management of natural resources, to preserve the natural environment and vegetation in urban areas by activating the soil, protecting the underground ecology system, and growing garden plants through the application of environmentally friendly concrete.

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Development of Planting Block for Protection of Inclined Plane Using Agriculture By-products (농업부산물을 활용한 사면보호용 식생 블럭 개발)

  • Baek, Sung-Chul;Kim, Young-Ik;Sung, Chan-Yong
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2002.10a
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    • pp.201-204
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    • 2002
  • This study is performed to develop of planting block using rice straw ash for Protection of Inclined plane. For the planting, porous concrete block is demanded ability to passing water and air through void of block. In this paper, material used for porous concrete block is cement, rice straw ash, and coarse aggregate(5-10, 10-20, 5-20mm). Planting block size is 23*23*4cm and kinds of planting are Tall fescue, Lespedeza cyrtobotrya and Lespedeza cuneata. The results measured for three months show that possible planting of various kinds for porous concrete block.

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Settlement Behavior of Composition Ground Improved by Recycled-Aggregate Porous Concrete Pile (순환골재 다공질 콘크리트 말뚝에 의한 복합지반의 침하 거동)

  • Kim, Se-Won;You, Seung-Kyong;Lee, Chang-Min;Cho, Sung-Min;Shim, Min-Bo;Choi, Hang-Seok
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.10a
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    • pp.1623-1629
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    • 2008
  • The purpose of this research is to assess the application of recycled-aggregate that is gained from construction wastes as the material of compaction pile method. At the same time, the development of the new technique rectifies defects of the existing compaction pile method for soft ground improvement. In this research, model tests were conducted for analyzing the effect of the soft ground improvement by porous concrete pile using recycled aggregate. Through the results of the model tests, the behavior of settlement on composition ground with surcharge pressure were elucidated.

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Fundamental Study on the Development of Porous Concrete Using Super Absorbent Polymer (고흡수성 수지를 활용한 다공질 구조 콘크리트 개발을 위한 기초적 연구)

  • Jo, Jae-Hyun;Baek, Sung-Jin;Lim, Gun-Su;Han, Jun-Hiu;Kim, Jong;Han, Min-Cheol
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.217-218
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    • 2023
  • This study is to develop porous concrete using super absorbent polymer, which possesses insolubility and high absorption capacity, as a substitute material for lightweight soil. Various mixtures were prepared using aggregates, cement, mixing water, and super absorbent polymer, and the absorption ratio and compressive strength were examined for each mixture. As the amount of super absorbent polymer added increased, the absorption ratio also increased, reaching up to 35-105%. However, the compressive strength decreased by 49.5% to 65.3%. This is believed to be due to the inherent properties of super absorbent polymer, which led to an increase in the absorption ratio but, in turn, reduced the binding strength of cement paste particles, resulting in a decrease in compressive strength.

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Physical Properties of Porous Concrete Using Admixtures (혼화재를 혼입한 투수콘크리트의 물리적 특성)

  • 채창우
    • Journal of the Korea Concrete Institute
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    • v.14 no.2
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    • pp.257-265
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    • 2002
  • Porous concrete has good permeability sine it contains about 10∼20 % of voids, had has been introduced to korea in early 1980's. It, however, has problems such as a lack of optimized mixture, low strength and durability, and etc. It is thus Interesting to manufacture high-performance porous concrete satisfying the mechanical characteristics to be supplied In practical construction. The results of this study were as follows : the compressive strength was 132∼221 kgf/$\textrm{cm}^2$, the splitting tensile strength was 15∼25 kgf/$\textrm{cm}^2$, the flexural strength was 36∼54 kgf/$\textrm{cm}^2$, and the coefficient permeability was 1.05${\times}$10$\^$-1/ ∼ 9.20${\times}$10$\^$-2/ cm/sec. In order to change the maximum size of aggregate, It is believed that other mixtures should be studied further.

An Experimental Study on the Mechanical Properties of Porous Concrete Using Coal Ash and Polymer (석탄재 및 고분자화합물을 이용한 포러스콘크리트의 역학적 특성에 관한 실험적 연구)

  • Lee, Byung-Jae;Park, Seong-Bum;Lee, Jun;Jang, Young-Il;Cho, Kwang-Yun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2008.04a
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    • pp.901-904
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    • 2008
  • Immense quantities of coal combustion by-products are produced every year, and only a small fraction of them are currently utilized. Therefore, this study investigated and analyzed the applications of porous concrete for the efficient utilization of bottom ash. This study examines on application of polymer to improve strength properties of porous concrete using coal-ash. As the results, when the mixing ratio of bottom ash increases, void ratio and coefficient of permeability of porous concrete increases, but its strength decreases. Also, as the mixing ratio of polymer increases, its void ratio and coefficient of permeability decreases. When specific amount of polymer is mixed, we can find its strength properties are improved.

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A Study on the Quality Properties of Porous concrete for Pavement Using Silica Fume and Steel Fiber (실리카퓸 및 강섬유를 이용한 포장용 포러스콘크리트의 품질특성에 관한 연구)

  • Park, Seung-Bum;Lee, Jun;Seo, Dae-Seuk;Yoon, Eui-Sik
    • International Journal of Highway Engineering
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    • v.7 no.3 s.25
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    • pp.31-42
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    • 2005
  • This study evaluates the physical mechanical properties, durability and sound absorbtion of porous concrete for pavement according to content of silica fume and steel fiber to elicit the presentation of data and the way to enhance its function for the practical field application of porous concrete as a material of pavement. The results of the test indicate that in every condition, the void ratio and the coefficient of water permeability of porous concrete for pavement satisfy both the domestic standards and proposition values. Among the properties of strength, the compressive strength satisfies the standards in the specification of Korea National Housing Corporation as for every factor of mixture but in the case of the flexural strength, more than 0.6vol.% of steel fiber satisfied the Japan Concrete Institute proposition values. The mixture of silica fume and steel fiber presents the excellent intensity, though. The case when silica fume and steel fiber are used simultaneously presents the strongest durability because the durability shows the similar tendency to the dynamic characteristics. The case when 10wt.% of silica fume and 0.6vol.% of steel fiber are used at the same time shows that the loss rate of mass by Cantabro test became 27% better and freeze-thaw resistance became 60% better. As for the characteristics of sound absorption of porous concrete for pavement, Noise Reduction Coefficient is 0.48 to prove that it possesses almost 50% sound absorption.

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NOx-removal and Sound-absorption Performances of Photocatalytic Porous Concrete Prepared by Various TiO2 Application Methods (TiO2 적용방법에 따른 포러스 콘크리트의 질소산화물 제거성능 및 흡음특성)

  • Yoon, Hyunno;Seo, Joonho;Kim, Seonhyeok;Jang, Daeik;Bae, Jinho;Lee, Haeng-Ki
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.42 no.2
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    • pp.163-170
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    • 2022
  • The present study investigates NOx-removal and sound-absorption performances of photocatalytic porous concrete prepared by various TiO2 application methods. Photocatalytic porous concrete samples were prepared by one of the following: 1) mechanically mixing TiO2 during casting; 2) mixing bottom ash aggregate pretreated with TiO2 during casting; and 3) spraying TiO2 solution to the normally fabricated porous concrete. The test results indicated that the mechanical mixing of TiO2 decreased the compressive strength as the added TiO2 content increased. The use of pretreated bottom ash aggregate reduced the porosity, yet the compressive strength of the concrete was similar to that measured from the former method. Porous concrete samples sprayed with the TiO2 solution exhibited enhanced compressive strength, while the porosity was analogous to those measured from other methods. The NOx-removal performance was the highest in the samples sprayed with the TiO2 solution, followed by the samples using pretreated bottom ash aggregate and mechanically mixed TiO2. The samples with mechanically mixed TiO2 identified a relationship between soundabsorption performance and porosity. However, no particular tendency was observable in the samples with other TiO2 application methods.

A Study on the Filed application of Environmental Friendly Porous Concrete For Planting (환경친화 식생용 포러스콘크리트의 현장적용성에 관한 연구 II)

  • Kim, Jeong-Hwan;Lee, Nam-Ik;Lee, Young-Hee;Lee, Jun;Park, Seung-Bum
    • Proceedings of the Korea Concrete Institute Conference
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    • 2006.11a
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    • pp.829-832
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    • 2006
  • The river environments of many streams in korea have been deteriorate through the rapid industrialization and urbanization since the 1960s. In korea, on the other hand, much efforts on the research and project have been made for the restoration of the deteriorated streams to close-to-nature. in order to restore the deteriorated streams, therefore, it is necessary to investigate such advanced technologies and materials. In view of this requirement, various research paths are being taken focusing on coarse aggregates to make multi-functional porous concrete having continuous voids so as to improve water and air permeability, acoustic absorption, water purification, and applicability to vegetation. The Purpose of this study is to investigate the method for recovery of the environment in the streams area using porous concrete painting block. the P.O.C block applies for test in the kyungan-cheon have been monitored planting during six month. after 6 months, plant grows flourishing and reconstructed in state such as nature rivers.

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Finishing methods and compressive strength-void ratio relationships of in-situ porous concrete pavement

  • Hatanaka, Shigemitsu;Mishima, Naoki;Nakagawa, Takeshi;Morihana, Hirotomo;Chindaprasirt, Prinya
    • Computers and Concrete
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    • v.10 no.3
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    • pp.231-240
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    • 2012
  • In this paper, the effect of finishing methods on the relationships between compressive strength, permeability and void ratio of porous concrete (POC) or pervious concrete is discussed, using core specimens taken from actually constructed POC pavement. To attain reliable performance in the construction work, a newly designed finisher for POC is developed, and the performances as well as methods for controlling void ratio are examined. The POC pavements were finished with three finishing methods viz., no finishing, finishing with standard compactor and finishing with prototype compactor. The results show that the prototype POC finisher is efficient in controlling the void ratio and the quality of POC pavements. The relationships between compressive strength as well as permeability and void ratio of the in-situ POC pavements finished by the prototype machine were obtained. They are slightly different from the laboratory test results owing mainly to the mold effect and the differences in compaction modes.