• Title/Summary/Keyword: 수중 불분리성 그라우트

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Characteristics of the Visco-elastic Grout Material in Fresh and Sea Water (해수와 담수에서 점탄성을 갖는 그라우트재의 공학적 특성 평가)

  • Kim, Ukgie;Cho, Samdeok;Park, Bonggeun;Song, Byeongdeok;Kim, Juhyong
    • Journal of the Korean GEO-environmental Society
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    • v.13 no.6
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    • pp.41-50
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    • 2012
  • In general, it is critical that grout consistency permit the complete filling of void space without segregation of ingredients. Recently, the antiwashout agent is used on underwater grout materials for preventing the grout from the segregation in water. This study introduces a new type of antiwashout underwater and flowable grout material using viscous modifiers and its characteristics comparing with conventional grout materials in fresh and sea water. It is found that the antiwashout underwater grout both in fresh and sea water has enough strength and good resistance to segregation.

Anti-washout Grouts for Underwater Sealing of Karst Cavities and Construction Research Tendencies (수중 불분리성 그라우트 개발 기술 동향)

  • Baluch, Khaqan;Kim, Jung-Gyu;Kim, Jong-Gwan;Yu, Ji-Yun;Yang, Hyung-Sik
    • Explosives and Blasting
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    • v.38 no.4
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    • pp.46-52
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    • 2020
  • Although anti-washout grouts are used extensively in underwater targets, major constraints continue to be associated with their use. These include poor bonding strength, poor pumpability, and loss of high strength in everyday engineering applications. In this study, based on the literature pertaining to self-compacted, non-dispersive, anti-washout grouts, a review of research trends in anti-washout grouts for underwater construction and sealing of karst cavities was carried out in order to determine the problems faced in this field. Grouts used under water suffer a loss of strength and bonding strength in comparison to grouts cast in air. Researchers are designing high-viscosity grouts to overcome the inrush of water and seal karst cavities; however, in doing so, they have inadvertently caused serious problems pertaining to the pumpability of these grouts and concretes in deep target locations. Thus, the majority of the anti-washout grouts and concretes that have been developed are not applicable to deep target environments, instead being suitable for only near-surface targets.

Strength Characteristics of the Anti-washout Grout Mixed with Coarse Fill Materials (점성개질제를 이용한 수중 불분리성 그라우트재의 수중 속채움 보강 특성 분석)

  • Kim, Uk-Gie;Cho, Sam-Deok;Park, Bong-Geun;Kim, Juhyong
    • Journal of the Korean Geosynthetics Society
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    • v.12 no.2
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    • pp.25-33
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    • 2013
  • This study introduces strength characteristics of the anti-washout grouting material using viscous modifiers and its characteristics mixed with coarse materials. Especially, this study focused on the strength characteristics of the grouts mixed with sea water. It is found that the anti-washout grout mixed with sea water has enough strength and good resistance to segregation just like that with fresh water. Also, a small scale test was performed to evaluate the solidification characteristic of the anti-washout grout mixed with coarse fill materials. It is also found that the strength of anti-washout grout mixed with coarse fill materials is greater and better segregation resistance than those of conventional grout with fill materials.

Effect of Anti-washout Admixture Implementation on Backfill Aggregates on Underwater Structures (수중 구조물 골재 속채움 시 수중 불분리성 혼화제의 적용 효과)

  • Kim, Ukgie;Choi, Changho;Park, Bonggeun;Li, Zhuang;Cho, Samdeok
    • Journal of the Korean GEO-environmental Society
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    • v.15 no.9
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    • pp.59-67
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    • 2014
  • With increasing underwater structure construction, there is high interest in offshore foundation and underwater grout and various study has been done in this area. For grout materials constructed underwater, it may be washed away by water or easily disturbed and material separation phenomenon during curing period always happens. As a result, it is difficult to ensure construction quality and this has a significant influence on the design strength of structure. In this study, to understand application effects of anti-washout admixture for the preplaced construction method, where grout is injected in monopile after filled with aggregates, laboratory tests on bleeding and compressive strength of anti-washout admixture were performed under various test conditions varying size of aggregate, water and cement ratio and admixture, and test results were compared and evaluated.

Experimental Study on Low-pH, Anti-washing Grouts Incorporating Gypsum for Reinforcement of Underwater Cavities (수중 공동보강용 석고 활용 저 pH형 수중불분리 그라우트에 대한 실험적 연구)

  • Kim, Young-sang;Baek, Jeong Jin;Kim, Hyeong-Ki
    • Resources Recycling
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    • v.27 no.6
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    • pp.30-37
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    • 2018
  • A series of experiment was conducted to evaluate basic performances of low-pH, anti-washing grouts incorporating gypsum which applied for reinforcing underwater cavities in limestone- grounds. Various types of mix proportions were designed and the fluidity, strength and environmental impact of these mixtures were evaluated. The flowability was evaluated under two conditions, i.e., flows without and with pressing, respectively. Strength was measured for the hardened mixtures fabricated under conditions of air and water injections. The environmental impacts including the pH of the suspension and the suspended solids concentration for the mixtures were evaluated. The low pH of fresh mixture suspension, below than 10, was achieved by incorporation of gypsum. The mix proportions of cement-quartz powder-gypsum binders and chemical agents resulted in mortar natural flow 7-10 cm and uniaxial compressive strength 4 MPa were derived.

Study on Anti-Washout Properties and Shear-Thickening Behaviors of Surfactant Added Cement Grouts (계면활성제 혼화제를 첨가한 시멘트 그라우트의 수중 불분리 특성 발현과 점도 증가 효과 연구)

  • Jang, In-Kyu;Seo, Seung-Ree;Park, Seung-Kyu
    • Applied Chemistry for Engineering
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    • v.23 no.5
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    • pp.480-484
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    • 2012
  • Concrete, the mixture of cement, sand, gravel and water, is a suspension substance extensively used to construct building materials. When a concrete mortar is applied to the underwater construction, the rheology of concrete is of great importance to its flow performance, placement, anti-washout and consolidation. In this research, the anti-washout and rheological properties of concrete have been investigated with concrete admixtures prepared by adding anionic surfactants, cationic surfactants, and polymeric thickeners. The concrete mortar formulated by pseudo-polymeric systems with the electrostatic association of anionic and cationic surfactants, showed high viscosities and suitable anti-washout properties, but poor pumpabilities. The addition of poly methyl vinyl ether to the mixed surfactant system exhibits synergistic effects by improving the concrete mortar properties of the concrete mortar such as fluidity, visco-elastic property, self-leveling, and anti-washout.

Evaluation on Field Applicability of Cast-In-Place Pile using Surfactant Grout (계면활성제계 그라우트를 활용한 흙막이 벽체공법(CIP)의 현장 적용성 평가)

  • Do, Jinung;Kim, Hakseung;Park, Bonggeun;Lee, Juhyung
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.36 no.1
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    • pp.75-83
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    • 2016
  • In case of underground construction affected by groundwater, CIP (Cast-In-Place Pile) method is generally used to resolve the geo-hydraulic problem. However, as this method has poor connectivity between piles, an auxiliary method for cut-off is needed in many cases. In this study, a new concept earth retaining wall method (H-CIP) with no auxiliary method, by using surfactant grout (Hi-FA) which improves antiwashout and infiltration ability, is introduced, and its field applicability is evaluated. CIP and H-CIP piles were installed with same ground conditions, and field and laboratory tests were conducted to verify the performance. As results, newly contrived H-CIP method shows higher field performance for cut-off and strength than conventional CIP method.

An Experimental Study on the Treatment of Waste Ash from the Incinerator by Alkali Soluble Acrylic Copolymer Emulsion (알칼리 용해성 아크릴계 수분산 중합체를 사용한 소각로 비산재의 처리에 관한 실험적 연구)

  • Lee, Hack-Yong;Choi, Sang-Reung;Noh, Jae-Ho;Heo, Hyung-Seok
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.5 no.1
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    • pp.111-116
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    • 2010
  • The treatment of heavy metal, in the waste ash from incinerator and mine solid waste, by using alkali-soluble acrylic copolymer emulsion, that is effective in the absorption of heavy metal has been studied. It seemed that alkali soluble acrylic copolymer emulsion was very effective in the absorption of Hg, Pb, Cd and Cu in this test. Also, eco-friendly thixotropic grout, using alkali soluble acrylic copolymer emulsion, that is effective in the absorption of heavy metal, for the recycling of waste ash from incinerator and mine solid waste has been tested. It was observed that waste ash could be used as a raw material of eco-friendly thixotropic grout mortar due to the effectiveness of alkali soluble acrylic copolymer emulsion in the fixation of heavy metals including $Cr^{6+}$ from waste ash in this test.

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A Study on the Development of Rapidly Hardening Grouting Method for the Effective Filling in the Underground Cavity (지하공동의 효율적 충전을 위한 급결 충전 그라우트공법개발에 관한 연구)

  • Kim, Soo-Lo;Kim, Tae-Heok;Shin, Dong-Chun;Kwon, Hyun-Ho
    • Tunnel and Underground Space
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    • v.19 no.6
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    • pp.534-544
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    • 2009
  • The collapse of the underground cavity can cause the abrupt local subsidence of the ground surface. It can be hazardous to the stability of road and building for human activity. Therefore it is necessary to develop reinforcement methods for the filling of the underground cavity. This study was executed to improve the material quality and systems to fill the calcium-aluminate mineral $(C_{12}A_7)$ environmentally, and minimize the loss of filling materials for the steep underground cavity. Filling material which was developed in this study is composed of rapid hardening material and additives. The developed material had rapid hardening and non-separation ability in the water cavity condition, so it made the effective underground dam in the cavity with prevention of material loss when it was poured in the water cavity. Results of heavy metal leaching test for environmental assessment showed that it was environmentally suiTable material for the filling in the mine cavity.

Properties of Undispersed Underwater Mortar Using the Expansive Additives and Fly Ash (팽창재 및 플라이애쉬를 이용하는 수중불분리 모르터의 특성)

  • 한천구;이대주;이광설;한일영;권지훈;유홍종
    • Magazine of the Korea Concrete Institute
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    • v.10 no.6
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    • pp.223-231
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    • 1998
  • Existing cast in place piles made by grouting cement mortar have many problems that cracks by autogeneous and drying shrinkage bring about the deterioration of force for piles, segregations by the submersion of ground water occur and also, high cement contents lead to rise the manufacturing cost. Therefore, this study is intended to investigate the mechanical properties of high performance mortar, incorporating expansive additives and fly ash. for cast in place piles. According to the experimental results, as the contents of expansive additives increase in mortar mixture, fluidity decrease and air contents shows inverse tendency. Setting time is delayed. Although compressive strength at 7days shows a decline tendency. compressive strength at 28days and 91days increase slightly with 5% of expansive additives. As fly ash increase in mortar mixture, high fluidity is shown, air contents increase and setting time is delayed at fresh state, and additives are, the larger length change is, whereas shrinkage decrease with the increase of fly ash.