• Title/Summary/Keyword: Low permeable concrete

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An Experimental Study on the Low Permeability Concrete with the Marine Wastes (해양폐기물을 이용한 수밀콘크리트 개발에 관한 연구)

  • 백신원;김인배
    • Proceedings of the Korean Institute of Industrial Safety Conference
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    • 2003.05a
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    • pp.74-79
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    • 2003
  • Many marine wastes such as seaweeds are casted aside at the seasides. So, the objective of this study is to apply the marine wastes to the concrete. To this end, mortar and concrete tests with the marine wastes have been conducted. The results of the present mortar and concrete tests indicate that the mortar and concrete with marine wastes admixtures exhibits very low permeability. The present study provides a firm base for the use of very low permeable concrete and the application of the marine structures and the submerged structures.

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Development and Application of Low Permeable Concrete for Underground Structures (지하구조물을 위한 수밀콘크리트의 개발 및 실용화)

  • Paik, S.H.;Park, S.S.;Park, J.Y.;Paik, W.J.;Um, T.S.;Choi, L.
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.10a
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    • pp.259-262
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    • 1999
  • In underground reinforced concrete structures, such as drainage structure, water and chloride ion penetrated into concrete through the cracks of concrete and its permeable property, cause the corrosion of reinforcing steel bar, which accelerates the expansive cracks and deterioration of concrete. It is necessary to control those deterioration of underground structure by improving its permeability and durability through the reasonable solutions in design, construction and materials. In the present study, fly ash concrete, which has good material properties in long-term period, was compared and studied with plain concrete using ordinary portland cement in terms of fundamental mechanical properties, permeability, drying shrinkage and durability. Also, the mix design and field test of low permeable concrete using fly ash were performed. From this study, fly ash concrete can control the penetration of water and chloride ion effectively by forming dense micro-structure of concrete. Therefore, fly ash concrete may increase the long-term function, performance and serviceability of underground structures.

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Enhancing mechanical and durability properties of geopolymer concrete with mineral admixture

  • Jindal, Bharat Bhushan;Singhal, Dhirendra;Sharma, Sanjay;Parveen, Parveen
    • Computers and Concrete
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    • v.21 no.3
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    • pp.345-353
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    • 2018
  • This paper approaches to improve the mechanical and durability properties of low calcium fly ash geopolymer concrete with the addition of Alccofine as a mineral admixture. The mechanical and durability performance of GPC was assessed by means of compressive strength, flexural strength, permeability, water absorption and permeable voids tests. The correlation between compressive strength and flexural strength, depth of water penetration and percentage permeable voids are also reported. Test results show that addition of Alccofine significantly improves the mechanical as well as permeation properties of low calcium fly ash geopolymer concrete. Very good correlations were noted between the depth of water penetration and compressive strength, percentage permeable voids and compressive strength as well as between compressive strength and flexural strength.

Mechanical Properties of Permeable Polymer Concrete for Permeability Pavement with Recycled Aggregate and Fiber Volume Fraction (재생골재 및 섬유 혼입률에 따른 포장용 투수성 폴리머 콘크리트의 역학적 특성)

  • Sung, Chan-Yong;Kim, Young-Ik
    • Journal of The Korean Society of Agricultural Engineers
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    • v.52 no.1
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    • pp.69-77
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    • 2010
  • Research on permeable pavement like asphalt and concrete pavement with porous structure has been increasing due to environmental and functional need such as reduction of run off and flood, and increase and purification of underwater resource. This study was performed to evaluate permeability, strengths and durability of permeable polymer concrete (PPC) using recycled aggregate that is obtained from waste concrete. Also, 6mm length of polypropylene fiber was used to increase toughness and interlocking between aggregate and aggregate surrounded by binder. In the test results, regardless of kinds of aggregates and fiber contents, the compressive strength and permeability coefficient of all types of PPC showed the higher than the criterion of porous concrete that is used in permeable pavement in Korea. Also, strengths of PPC with increase polypropylene fiber volume fraction showed slightly increased tendency due to increase binder with increase of fiber volume fraction. The weight reduction ratios for PPC after 300 cycles of freezing and thawing were in the range of 1.6~3.8 % and 2.2~5.6 %, respectively. The weight change ratio was very low regardless of the fiber volume fraction and aggregates. The weight reduction ratios of PPC with fiber and aggregate were in the range of 1.3~2.7 % and 2.2~3.2 % after 13 weeks and was very low regardless of the fiber volume fraction and aggregates.

An Experimental Study on the Flexural Characteristics of Water-permeable Concrete reinforced with Wire Mesh and Fibers (와이어 매쉬 및 섬유 종류별 보강된 투수 콘크리트의 휨특성에 관한 실험적 연구)

  • Lee, Byung-Jae;Park, Seong-Bum;Jang, Young-Il;Jun, Heum-Jin;Hyun, Ji-Hong;Cho, Kwang-Yun
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.367-368
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    • 2010
  • Having function to reducing environmental load, water-permeable concrete has advantages to ground permeation of rain-water and sound absorbtion, heat island reduction, etc., but represents the low flexural characteristics compared with general concrete. Therefore, this study analyzed the flexural characteristics by producing water-permeable concrete mixed with wire mesh or fiber reinforcing for improvement to the flexural characteristics of water-permeable concrete.

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Surface Image Analysis for Evaluating Porosity and Permeability Coefficient of Permeable Concrete Block (투수 콘크리트 블록 공극률 및 투수계수 평가를 위한 표면 이미지 분석 기법 개발)

  • Jo, Sangbeom;Son, Younghwan;Kim, Donggeun;Jeon, Jihun;Kim, Taejin
    • Journal of The Korean Society of Agricultural Engineers
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    • v.65 no.2
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    • pp.47-57
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    • 2023
  • The increase of impermeable area ratio is causing hydrologic cycle problems in urban areas and groundwater depletion in rural areas, permeable pavements are getting attention to expand permeable areas. The performance of the permeable concrete block pavement, which is part of the permeable pavement, is greatly affected by the porosity. In addition, the permeability coefficient is a major factor when designing permeable concrete block pavement. Existing porosity and permeability test methods have problems such as uneconomical or poor field applicability. The object of this study was to develop a methodology for evaluating porosity and permeability coefficient using a surface image of a permeable concrete block. Specimens are manufactured with various porosity ranges and porosity and permeability tests are performed. After surface image preprocessing, normalization and binarization methods were compared. Through this, the method with the highest correlation with the lab test result was determined. From the results, the PDR (pore determined ratio) was obtained. Simple linear regression analysis is performed with PDR and lab test results. The results showed a high correlation of R2 more than 0.8, and the errors were also low.

An Experimental Study on the Permeability Measurement and Development of Ultra Low Permeable Concrete (콘크리트의 투수성 측정 및 초저투수성 콘크리트의 개발 연구)

  • 오병환;정원기;차수원;장봉석
    • Magazine of the Korea Concrete Institute
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    • v.8 no.5
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    • pp.189-200
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    • 1996
  • The permeability of concrete influences the durability of concrete remarkably. The conventional test method for permeability is very difficult to apply to high strength concrete because of its very low permeability. The present study employs a resonable and realistic test method for permeability of concrete and proposes a very low permeability concrete. To this end, comprehensive tests have been conducted and major test variables include the types and amount of cement. the types and amount of admixtures, and the size of aggregates. The present test results indicate t h a t the permeability decrease with the increase of strength and that the concrete with certain mineral admixtures exhibits very low permeability. The permeability of those high performance concrete is about 1/100 of conventional normal concrete. The present study provides a firm base for the use of very low permeable and hence very durable concrete.

Development of Low Permeable Concrete for the Control of Deterioration in Underground Structures (지하구조물의 열화방지를 위한 수밀성 콘크리트의 개발)

  • Paik, S.H.;Park, S.S.;Park, J.Y.;Paik, W.J.;Um, T.S.;Choi, L.
    • Proceedings of the Korea Concrete Institute Conference
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    • 1999.04a
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    • pp.191-196
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    • 1999
  • In underground reinforced concrete structures, such as drainage structure, water and chloride ion penetrated into concrete through the cracks of concrete and its permeable property, cause the corrosion of reinforcing steel bar, which accelerates the expansive cracks and deterioration of concrete. It is necessary to control those deterioration of underground structure by improving its permeability and durability through the reasonable solutions in design, construction and materials. In the present study, fly ash concrete, which has good material properties in long-term period, is compared and studied with plain concrete using ordinary portland cement in terms of fundamental mechanical properties, permeability, drying shrinkage and durability. Also, the mix design and its properties of low permeable concrete using fly ash are reviewed. From this study, fly ash concrete can conctrol the penetration of water and chloride ion effectively by forming dense microstructure of concrete. Therefore, fly ash concrete may increase the long-term function, performance and serviceability of underground structures.

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Strength and permeation properties of alccofine activated low calcium fly ash geopolymer concrete

  • Jindal, Bharat Bhushan;Singhal, Dhirendra;Sharma, Sanjay;Yadav, Aniket;Shekhar, Shubham;Anand, Abhishek
    • Computers and Concrete
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    • v.20 no.6
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    • pp.683-688
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    • 2017
  • This paper presents the experimental investigations on the compressive strength and permeation properties of geopolymer concrete prepared with low calcium fly ash as the primary binder activated with different percentage of Alccofine. The durability aspect was investigated by performing permeable voids and water absorption tests since permeability directly influences the durability properties. The test results show that Alccofine significantly improves the compressive strength and reduces the water permeability thus enhances the durability of geopolymer concrete at ambient curing regime which encourages the use of geopolymer concrete at ambient curing condition thus promising its use in general construction also.

A Study on the Fundamental Properties of Permeable Concrete Using the Electric Arc Furnace Slag Aggregate (전기슬래그 골재를 활용한 투수성 콘크리트의 기초적 성질에 대한 연구)

  • 문한영;김성수;정호섭;안기용
    • Proceedings of the Korea Concrete Institute Conference
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    • 1998.04a
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    • pp.227-230
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    • 1998
  • The void ratio, continuous void ratio, coefficient of permeability, compressive strength and tensile strength were considered according to the EAF(Electric Arc Furnace) slag replacement and sand percentage in permeable concrete used with EAF slag as aggregate. The sand percentage was directly proportional to the permeable coefficient, but inversely proportional to the compressive strength. When the compressive strength and coefficient of permeability were 230 kg/$\textrm{cm}^2$ and 1$\times$$10^{-1}$ cm/sec, the useful sand percentage was 8%. When the EAF slag replacement was 25%, the coefficient of permeability was the most low and compressive strength was the most high.

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