• 콘크리트학회논문집
• /
• 제12권6호
• /
• pp.91-98
• /
• 2000

Porous concrete having continuous voids is gaining more interest as an ecological material. It has several useful functions such as water and air permeability, sound absorption, etc. Its strengths are considerably lower than those of conventional concrete due to the large and continuous voids in it. This study has been carried out to investigate the influence of mix factors and mixture proportion of aggregate on the strengths and water permeability of porous concrete. And it has been carried out to investigate the evaluation of void of porous concrete by the ultra-sonic pulse velocity. The results f this study are as follows: 1) The theoretical void ratio has greater influence than any other factor on the strengths and water permeability of porous concrete. And it is a little affected by the replacement proportion of silica-fume and mixture proportion of aggregate. 2) Because the coefficients of correlation between the void ratio and ultra-sonic pulse velocity were relatively high, it will be possible that the void ratio is predicted by the ultra-sonic pulse velocity.

• 한국해양공학회지
• /
• 제4권1호
• /
• pp.71-80
• /
• 1990

We experimented the physical property of the porous concrete by changing the water cement ratio, when the aggregate ratios are 1:5 and 1:7 separately. And then we received the results as follows. The bigger, the coarse grading of the porous concrete is, the more sensitive to the water cement ratio, the porous concrete becomes. And if we think over its compressive strength, the coarse aggregate which has 5-15mm width is most appropriate. So we concluded that when its compressive strength, permeability coefficient and its unit weight are $50kg/cm^{2}3cm/sec$ and $1900kg/m^{3}$ respectively, the water cement ratio which has 35-37% width is most appropriate, too. And its compressive strength and unit weight show that they are about a quarter and three quarters respectively about the conventional concrete.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
• /
• pp.215-216
• /
• 2019

Recently, due to abnormal climate phenomena caused by greenhouse gas, flood damage such as local torrential rain has been emerging in Korea. Accordingly, there is a growing need for porous blocks capable of permeability in concrete, but there are limitations in commercialization due to problems such as high unit weight and flexural strength development limitations. This study investigates the unit weight and strength properties of porous blocks using bottom ash as an alternative to aggregate as part of a study to improve the light weight of porous blocks.

• 콘크리트학회논문집
• /
• 제14권4호
• /
• pp.623-629
• /
• 2002

최근 환경보존에 대한 인식전환이 범세계적으로 확산되고 있는 가운데 건설기술자들은 환경문제를 해결하기 위한 일환으로 콘크리트에 잔골재를 사용하지 않고 불연속 입도의 굵은 골재를 사용한 환경친화적 건설재료인 다공질콘크리트에 주목하려 다양한 방면에서 연구가 활발히 진행되고 있다. 따라서 본 연구는 환경친화적인 식생용 포러스콘크리트를 제조하기 위한 기초적 연구로서, 골재입도와 페이스트골재비 및 산업부산물의 혼입에 따른 식생용 포러스콘크리트의 물리ㆍ역학적 특성과 식생능력을 평가하였다. 시험결과 골재입도가 감소함에 따라, 페이스트골재비가 증가함에 따라 압축강도는 증가하였으며, 공극률은 점차 감소하였다. 식생능력 평가 결과 씨앗 파종후 30일까지는 골재입도 및 페이스트골재비에 관계없이 동일한 생육양상을 보였으나, 30일 이후에서는 골재입도가 줄어듬에 따라, 페이스트골재비가 증가함에 따라 초장이 감소하였으며, 특히 5~10mm골재를 사용한 경우에는 10~20 mm 20~30mm 입도의 골재를 사용한 경우보다 현저히 초장이 줄어드는 경향이 나타났다.

• 한국구조물진단유지관리공학회 논문집
• /
• 제9권3호
• /
• pp.93-100
• /
• 2005

본 연구는 con crusher와 impact crusher로 생산된 골재의 입형과 크기에 따른 포러스 콘크리트의 특성을 파악하는데 있으며, 이를 위한 실험인자로는 골재의 입형과 크기, 물시멘트비 그리고 페이스트 굵은골재비이다. 연구결과, 포러스 콘크리트는 impact crusher로 생산한 골재를 사용할 경우 경제성은 물론 물리적 특성이 향상되었다. 또한, 포러스 콘크리트의 투수계수와 압축강도는 공극율과 매우 높은 상관성을 보이며, 공극율의 함수로서 제시할 수 있었다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
• /
• pp.779-784
• /
• 2002

Porous concrete with a great deal of continuous porosity enables to contain water and to pass air freely through firmly hardened material, and allow necessary nutrients to reach roots of vegetation. Therefore, this paper deals with the voluntary properties and efficiency for planting of plant porous concrete. The results of experiment showed that void volumes were 17% to 31%, and compressive strength ranged between 80kgf/cm$^2$ and 180kgf/cm$^2$ when the ratio of the paste to aggregate was 0.3-0.5 When the aggregate size are 20-30mm, the paste to aggregate ratio is 0.3, and the length of Paranial Ryegress came up as 32cm. Ut supra the efficiency of planting goes through Paranial Ryegrass in result the length of plant are in compliance with void volume and aggregate size.

• KCI Concrete Journal
• /
• 제14권4호
• /
• pp.161-169
• /
• 2002

The mechanical properties of fiber reinforced porous concrete for use as a planting material were investigated in this study. Changes in physical and mechanical properties, subsequent to the addition of carbon fiber and silica fume, were studied. The effects of recycled aggregate were also evaluated. The applicability as planting work concrete material was also assessed. The results showed that there were no remarkable changes in the void and strength characteristics following the increase in proportion of recycled aggregate. Also, the mixture with 10% silica fume was found to be the most effective for strength enforcement. The highest flexural strength was obtained when the carbon fiber was added with $3\%$. It was also noticed that PAN-derived carbon fiber was superior to Pitch-derived ones in view of strength. The evaluation of its usage for vegetation showed that the growth of plants was directly affected by the existence of covering soil, in case of having the similar size of aggregate and void.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
• /
• pp.489-492
• /
• 2003

The results of an experiment on the sound absorption of the porous concrete and its influence on the compressive strength are reported in this paper. Two different sizes of coarse aggregate of 5~13, 13~20mm, and the design void ratio of 20, 25 and 30 percent for a given size of aggregate were used. In the compressive strength, an aggregate of the size of 5~13mm is much higher strength than that of the 13~20mm, In the sound absorption experiment, the size of aggregate of 5~l0mm is much higher sound absorption than that of the 13~20mm. The sound absorption ratio was increased as the design void ratio. As a result, Porous concrete sufficiently have the performance of sound absorption.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2008년도 추계 학술발표회
• /
• pp.1623-1629
• /
• 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.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
• /
• pp.705-710
• /
• 2002

Recently, there has been for a number of reasons growing interest in the use of porous concrete, and it is used as an ecological material. But, because the valuation methods of the quality on the fresh porous concrete aren't established up till now, it is difficult that the harden porous concrete is made sure of its required quality. This study is to present the measurement method of the void ratio on the fresh porous concrete and to analyze the influence of water-cement ratio and vibrating time on the binder content covered a coarse aggregate. Results of this study were shown as follows; The measurement methods of the void ratio and aggregate-binder weight ratio on the fresh porous concrete can be useful as data for the quality control of fresh porous concrete.