KR20150137699A - Injection for soil and Ground reinforcement composite using Mg-Al inorganic powder system - Google Patents

Injection for soil and Ground reinforcement composite using Mg-Al inorganic powder system Download PDF

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KR20150137699A
KR20150137699A KR1020140066024A KR20140066024A KR20150137699A KR 20150137699 A KR20150137699 A KR 20150137699A KR 1020140066024 A KR1020140066024 A KR 1020140066024A KR 20140066024 A KR20140066024 A KR 20140066024A KR 20150137699 A KR20150137699 A KR 20150137699A
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ground
cement
injection
ground reinforcement
mgo
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KR1020140066024A
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Korean (ko)
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소정섭
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소정섭
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • C04B22/062—Oxides, Hydroxides of the alkali or alkaline-earth metals
    • C04B22/064—Oxides, Hydroxides of the alkali or alkaline-earth metals of the alkaline-earth metals
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides
    • C04B22/066—Magnesia; Magnesium hydroxide
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting

Abstract

The present invention as a composition related to the manufacture of a ground injection reinforcing material composed of only powder, discloses combination of a ground injection reinforcing material with excellent early strength and workability, which comprises: adding water, stirring, and injecting after substituting and adding 10 wt% of Ordinary Portland cement. A composition of a ground reinforcement injecting material is composed of ingredients of 37.3 to 43.5 wt% of CaO, 22.1 to 27.3 wt% of SO_3, 15.0 to 18.6 wt% of Al_2O_3, and 5.1 to 6.25 wt% of MgO.

Description

Mg-Al 계 무기분체를 이용한 지반주입 및 지반보강 조성물{Injection for soil and Ground reinforcement composite using Mg-Al inorganic powder system}BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Mg-Al inorganic powder system,

본 발명은 대형 건축물 기초부 또는 토목구조물 기초부의 지반의 강도 증진이나 보강을 위한 보링 그라우팅공사의 주입재료에 관한 것으로, 보다 상세하게는, 초고층 건물, 대단위 아파트 등의 건축현장 뿐 아니라 도로공사, 지하철공사, 터널공사 등 대단위 토목공사에 이르는 건설공사에서, 지지 기반을 보강하기 위하여 실시하는 지반 보링, 그라우팅공사에 사용하는 무기질 성분의 속경형 시멘트계 지반보강 재료이다.The present invention relates to an injection material for a boring grouting work for enhancing or reinforcing the strength of a foundation of a large building or a foundation of a civil structure, and more particularly, to a construction material such as a high- It is a fast-curing type cementitious ground reinforcement material used in the ground boring and grouting works to reinforce the support base in construction work ranging from construction to tunnel construction.

지반보강을 위해 적용되는 일반적인 공법 중 지반보강 앵커 공법은 토목이나 건축의 구조물을 지반에 정착시키기 위해 강도의 강재로 연결하여 그 강재에 높은 긴장력을 도입하여 구조물에 횡방향 또는 연직방향의 구속력 또는 선행 하중을 가하기 위한 효과적인 공법으로 근래에 국내외에서 활발히 사용되고 있다. Among the general methods applied for reinforcing the ground, the ground reinforcement anchor method is a method of connecting a structural or structural structure to the ground by connecting it with a steel material of high strength and applying a high tension force to the steel material, It is an effective method for applying loads and has been actively used at home and abroad in recent years.

이 공법에서 실시하려는 앵커는 보강하려는 지반에 무기질의 경화체로 기둥을 고정시키는 것으로 지반과 구조물을 하나의 집합체로 묶는 효과를 발휘하며 일반적으로 강선과 시멘트 그라우트로 구성되어 있다.      The anchor used in this method is to fix the column with mineral cement to the ground to be reinforced, and it has the effect of tying the ground and the structure into one aggregate and is generally composed of steel wire and cement grout.

지반보강 앵커공법은 가설 토류벽의 지보공, 영구 앵커 토류벽, 송전탑 기초, 댐의 보강, 지하구조물의 부력앵커, 사면보강 등에 다양하게 사용된다.
The ground reinforcement anchor method is used variously for the foundation of the temporary earth wall, the permanent anchor earth wall, the base of the transmission tower, the reinforcement of the dam, the buoyancy anchor of the underground structure, and the slope reinforcement.

지반보강 앵커공법은 지반에 구멍을 뚫어 철근이나 PC 강선을 집어 넣은 다음, 시멘트와 물을 혼합한 밀크를 그라우팅하여 굳힌 다음 다시 외부에서 PC강선이나 철근 등에 인장력을 가해 정착시키는 것이다. 이때 앵커에서의 문제점은 일반적인 시멘트 밀크의 경우, 유동성을 좋게 하기 위해서는 물/시멘트의 비가 높게 되고, 이로 인해 천공된 구멍 내에서 재료분리가 일어나 블리딩수가 발생하게 된다. 이렇게 천공된 구멍의 윗부분에 발생된 블리딩수가 나중에 유실되면 그 부분은 공극으로 남게 되고, 이러한 공극이 철근 인장시 주변마찰력을 증대시킬 수 없는 문제점이 있다.     The ground reinforcement anchor method involves drilling a hole in the ground to insert a reinforcing steel or PC steel wire, grouting and mixing the cement and water mixed milk, and then fixing it by applying a tensile force to the PC steel wire or reinforcing bar. The problem with the anchor is that in the case of general cement milk, the water / cement ratio becomes high in order to improve the fluidity, resulting in material separation in the perforated hole, resulting in bleeding water. If the amount of bleeding generated at the upper portion of the perforated hole is later lost, the portion remains as a void, and such a gap can not increase the peripheral frictional force when the reinforcing steel is pulled.

따라서, 공극을 완전 충전시킬 수 있는 팽창을 필요로 하며, 이러한 공극발생을 방지하기 위해 체적팽창제와 같은 물질을 소량 첨가하여 그라우팅하는 공법이 활용되고 있다.Therefore, it is necessary to expand the pores to be able to completely fill the pores. To prevent such pores, a method of grouting with a small amount of a material such as a volume expanding agent is utilized.

이와 더불어 일반적인 시멘트 밀크를 그라우트재로 사용하는 경우, 사용하는 물/시멘트 비가 높기 때문에 인장작업에 필요한 강도발현이 7일 이후에 나타나 전체적인 작업공정이 길어지는 현상이 발생하는 문제점이 있다.In addition, when a general cement milk is used as a grout material, since the water / cement ratio to be used is high, the strength development required for the tensile work is present after 7 days, resulting in a problem that the overall working process becomes longer.

지반보강 주입 기술은 일본, 독일, 미국 등 선진국을 중심으로 시공기술과 더불어 용액형, 현탁액형이 개발되었으며, 1980년대 일본에서 SGR 공법 등 유사한 공법들이 도입되었고, 우리나라에서는 시멘트와 규산소다를 적용하는 현탁액형 지반주입재가 현재 보편적으로 사용되고 있다. In the 1980s, similar techniques such as the SGR method were introduced in Korea in the 1980s. In Korea, cement and silicate soda were applied. Suspension type ground fillers are now commonly used.

규산소다를 사용하는 현탁액형 지반주입재는 시멘트와 혼합될 경우 급결하는 성질을 가지는 규산소다가 액상형태로 보강재료에 사용되어 지반으로 침투되고, 겔타임 조정이 가능하고 재료의 가격이 비교적 경제적이어서 보편적으로 사용되고 있다. 그러나 규산소다 중의 Na 성분의 높은 이온화 특성으로 인하여 겔 형성 이후 점진적인 용탈현상으로, 형성된 보강재료의 강도가 저하되고, 장기적으로는 조직 붕괴로 인한 지반보강의 특성 상실과 2차적으로 누수로 인한 지하수 오염의 문제를 발생시킨다.     In the case of silicate soda ash, suspension type soil injection material is mixed with cement, so that sodium silicate having rapid properties can be used as reinforcement material in liquid form to penetrate into the ground, gel time can be adjusted, and material cost is relatively economical. . However, due to the high ionization characteristics of Na component in the sodium silicate, the strength of the reinforced material decreases due to the gradual leaching phenomenon after gel formation. In the long term, the property of the ground reinforcement due to tissue collapse is lost, .

이러한 이유로 규산소다의 용탈 현상 제공 물질인 Na의 함량을 대폭 저감시킨 특수규산계 급결재 및 고분말 시멘트를 이용하는 SGR 공법이 개발되어 실용화되고 있다.      For this reason, the SGR method using a special silicate-based filler and high-powder cement that significantly reduces the content of Na, which is a substance causing the leaching phenomenon of sodium silicate, has been developed and put into practical use.

특수규산계 급결재를 이용한 방법은 대체로 보강재료내의 용해성 물질을 대폭 저감하여, 용탈 현상으로 인한 조직붕괴의 원인은 감소하고 차후 누수로 인한 환경오염의 문제를 종래의 규산소다를 사용하는 방식에 비해 낮추는 것으로, 속경성을 부여하기 위하여 Na 성분을 완전히 제거하지 못하여, 장기적인 관점에서는 여전히 용탈 현상이라는 문제점은 존재한다.      The method using a special silicate-based filler generally reduces the soluble matter in the reinforcing material to a large extent, causes the cause of the collapse of the structure due to the leaching phenomenon to be reduced, and the problem of environmental pollution due to the subsequent leakage is compared with the conventional method using the silicate There is a problem that the Na component is not removed completely to give a quick hardening, and therefore, there is still a leaching phenomenon from a long-term viewpoint.

또한 규산계 급결재 원료가 가지는 단점으로 시멘트 무기질계 지반주입재에 비해 장기강도 발현이 미흡하여 보강특성이 뛰어나지는 않다. 또한 규산소다를 사용하는 지반주입재에 비하여 재료비가 상승하는 문제도 안고 있다.     Also, as a disadvantage of silicate-based filler, there is insufficient long-term strength development compared to cement inorganic filler. Also, there is a problem that the material cost is higher than that of the ground filler using sodium silicate.

시멘트 무기질계 지반주입재는 일본에서 급결용 CSA(Calcium Sulpho Aluminate)계 시멘트가 개발되면서 상용화된 기술로서, 용탈이 거의 없어 환경적으로 안정할 뿐만 아니라, 장기강도 특성이 우수하여 지반의 차수 및 보강특성이 영구적으로 유지되기 때문에 종래의 다른 지반주입재에 비해 가장 뛰어난 특성을 나타낸다. 국내에서도 환경오염 문제가 건설현장에서 첨예의 문제로 대두되면서 일부 업체에서 일본의 기술 및 급결용 시멘트를 받아들여 시멘트계 무기질 지반주입재에 적용하고 있으나, 일본 수입품인 급결용 CSA계 시멘트가 워낙 고가인 관계로, 이를 사용하여 제조된 주입재의 보편적 상용화는 되지 않은 실정이다.    Cement Inorganic ground filler is a commercialized technology developed by CSA (Calcium Sulpho Aluminate) based cement for use in Japan. It is not only environmentally stable due to leaching but also has excellent long-term strength characteristics, Is retained permanently, it exhibits the best characteristics compared to other conventional ground fillers. In Korea, environmental pollution problem has been pointed out as a problem in the construction site, and some companies have adopted Japanese technology and quick-setting cement for cement-based inorganic ground filler. However, CSA cement for Japanese import is very expensive And the general commercialization of the injection material produced by using it has not been realized.

본 발명은 기존에 사용하는 지반주입재의 흐름성, 작업성 등의 주입특성과 겔타임 조절 특성, 1일 강도 확보의 특성을 유지하면서, 속경특성을 부여하기 위하여 Mg 계 분체를 이용하여 속경시간을 조절하는 것이 가능하고, 비교적 저가의 Mg계 분체를 이용함으로서 기존 지반주입제와의 가격경쟁력을 확보할 수 있다.The present invention relates to a method for controlling the loading time of a ground filler using a Mg-based powder in order to impart the particle size characteristics while maintaining the injection characteristics such as flowability, workability, etc., And it is possible to secure price competitiveness with existing ground injection agent by using relatively low-cost Mg powder.

본 발명에 의한 지반주입보강재는 시멘트에 혼합하여 사용하며, 좀 더 상세하게는 시멘트에 10wt% 치환첨가하여 물과 혼합하여 보강체를 형성하도록 충분히 교반한 후 주입하게 된다.
The ground reinforcement material according to the present invention is mixed with cement. More specifically, 10 wt% of the cement is substituted with cement and mixed with water to sufficiently form a reinforcing body.

본 발명에 의한 지반보강주입재의 구성은 CaO 37.3~43.5wt%, SO3 22.1~27.3wt%, Al2O3 15.0~18.6wt%, MgO 5.1~6.25wt% 범위이다. 지반보강주입재의 성분 중 CaO와 SO3는 주입재 경화체 바인더재료이며, Al2O3 와 MgO 는 바인더의 응결 속도를 제어하는 제어부로 작용한다.The composition of the ground reinforcement injection material according to the present invention is in the range of 37.3 to 43.5 wt% CaO, 22.1 to 27.3 wt% of SO 3 , 15.0 to 18.6 wt% of Al 2 O 3 , and 5.1 to 6.25 wt% of MgO. Among the components of the ground reinforcement injection material, CaO and SO 3 are the binder material of the injection material hardener, and Al 2 O 3 and MgO serve as a control unit for controlling the solidification speed of the binder.

바인더부와 제어부의 조성 비율은 (CaO+SO3)/(Al2O3+MgO)=2.39~3.522의 범위를 가진다.
The composition ratio of a binder portion and the control unit is in the range of (CaO + SO 3) / ( Al 2 O 3 + MgO) = 2.39 ~ 3.522.

본 발명에서 바인더로 사용가능한 CaO 및 SO3 재료는 CSA(Calcium Sulpho Aluminate), 보통포틀랜드 시멘트, 초속경 시멘트, 조강 시멘트, 알루미나 시멘트, 마이크로 시멘트 등의 시멘트계 재료, 무수석고, 이수석고, 반수석고 등 석고계 재료가 단독 혹은 1가지 이상 혼합하여 사용할 수 있다.
The CaO and SO 3 materials usable as binders in the present invention include cementitious materials such as CSA (Calcium Sulpho Aluminate), ordinary portland cement, quick-speed cement, crude steel cement, alumina cement and micro cement, anhydrous gypsum, Gypsum-based materials may be used alone or in admixture of one or more.

본 발명에서 바인더의 제어부로서 사용가능 한 재료는 황산알루미늄, 수산화알루미늄, 알루민산 나트륨, 소듐 알루미네이트, 수산화마그네슘, 황산마그네슘, 산화마그네슘, 탄산마그네슘 등이 사용가능하며, 이 재료 중 단독 혹은 1가지 이상 혼합하여 사용하는 것도 가능하다.    The material usable as the control part of the binder in the present invention is aluminum sulfate, aluminum hydroxide, sodium aluminate, sodium aluminate, magnesium hydroxide, magnesium sulfate, magnesium oxide and magnesium carbonate. It is also possible to use them by mixing them.

일정한 작업성과 흐름성을 공급하기 위해 본 발명에서는 분말의 유동화제를 사용하는 것이 가능하며, 사용 가능한 재료로는 나프탈렌계, 멜라민계, 폴리카본산계 및 이들의 혼합물로 이루어진 그룹에서 선택할 수 있으며, 10~12wt% 함유되는 것이 바람직하다.     In order to provide a constant workability and flowability, it is possible to use a fluidizing agent for the powder in the present invention, and the usable materials may be selected from the group consisting of naphthalene type, melamine type, polycarbonate type and mixtures thereof, By weight to 12% by weight.

본 발명의 큰 특징은 분말형태만으로 구성되는 지반보강주입재로서, 반응속도 및 물성 발현의 조정을 위한 반응 조절제, 지연제, 촉진제의 별도 추가 공정 없이, 제조된 지반보강 주입재만으로의 구성 성분과 그 배합을 조정하는 것만으로 겔 타임 및 응결시간을 조절하는 것이 가능하다.A major feature of the present invention is a ground reinforcement injection material composed only of a powder form, and it is possible to provide a ground reinforcement injection material containing only constituent components of the prepared ground reinforcement injection material and a composition thereof without any additional process of reaction control agent, retarder, It is possible to adjust the gel time and the setting time.

또한, 시멘트 및 무기계 분말재료로만 구성되어 복구대상 모체인 콘크리트 단면과의 일체화가 가능하여 주입 후 성능을 극대화할 수 있다.
In addition, it can be integrated with concrete section, which is the restoration subject matrix, composed of only cement and inorganic powder material, so that the performance after injection can be maximized.

본 발명의 실시에 있어 구성비의 범위를 만족하는 성분으로 배합을 하여 실시예1과 실시예2의 배합으로 실험을 진행하였고, 상기 구성비를 만족하지 않는 Al2O3와 MgO 의 배합으로 비교예1과 비교예2 실험을 진행하였다.
In the practice of the present invention, the components were mixed with the components satisfying the composition ratios, and the experiment was carried out in the same manner as in Example 1 and Example 2. In the case of the composition of Al 2 O 3 and MgO, And Comparative Example 2 were carried out.

CaOCaO SOSO 33 AlAl 22 OO 33 MgOMgO 실시예1Example 1 38.338.3 22.822.8 15.615.6 5.35.3 실시예2Example 2 42.642.6 25.325.3 18.118.1 6.16.1 비교예1Comparative Example 1 40.240.2 26.326.3 14.014.0 4.14.1 비교예2Comparative Example 2 42.142.1 25.425.4 22.222.2 8.28.2

시험 결과, 본 발명의 구성 조건을 만족하는 실시예1과 실시예2의 경우, 압축강도, 특히 1일 압축강도 발현이 200kg/cm2 이상으로 지반보강주입재로서의 필수조건인 1일 200kg/cm2의 강도조건을 만족하고, 흐름성 또한 10초 이하로서 작업을 실시하기에 충분하다.As a result of the test, in the case of Examples 1 and 2 satisfying the constitutional conditions of the present invention, the compressive strength, particularly, the compressive strength development per day was 200 kg / cm 2 or more and required to be 200 kg / cm 2 And the flowability is 10 seconds or less, which is sufficient to carry out the work.

본 발명의 구성 조건을 만족하지 않는 비교예1과 비교예2의 경우에, 비교예1의 경우는 Al2O3와 MgO의 성분이 낮아 강도발현이 낮고 흐름성 또한 저하됨을 알 수 있다. 그리고 비교예2의 경우 Al2O3와 MgO의 성분이 높기 때문에 반응속도가 빨라 위응결 현상이 일어나고 작업성은 측정 불가할 정도의 응결현상을 보인다.
In the case of Comparative Example 1 and Comparative Example 2 which do not satisfy the constitutional condition of the present invention, in the case of Comparative Example 1, the components of Al 2 O 3 and MgO are low, so that the strength development is low and the flowability is also lowered. In the case of Comparative Example 2, since the components of Al 2 O 3 and MgO are high, the reaction speed is high and the stagnation phenomenon occurs, and the workability shows a degree of condensation that can not be measured.

흐름성Flowability
(초)(second) 압축강도 (Compressive strength ( kgkg // cmcm 22 )) 1일1 day 3일3 days 7일7 days 28일28th 실시예1Example 1 1010 215215 316316 385385 517517 실시예2Example 2 99 204204 345345 399399 524524 비교예1Comparative Example 1 1818 8080 180180 220220 290290 비교예2Comparative Example 2 -- 116116 297297 234234 314314

Claims (2)

지반보강주입재 성분이 CaO 37.3~43.5wt%, SO3 22.1~27.3wt%, Al2O3 15.0~18.6wt%, MgO 5.1~6.25wt% 인 조성물.
Wherein the ground reinforcement material is CaO 37.3 to 43.5 wt%, SO 3 22.1 to 27.3 wt%, Al 2 O 3 15.0 to 18.6 wt%, and MgO 5.1 to 6.25 wt%.
CaO와 SO3는 바인더부이고, Al2O3와 MgO 는 바인더의 응결 속도를 제어하는 제어부로서, 바인더부와 제어부의 조성 비율은 (CaO+SO3)/(Al2O3+MgO)=2.39~3.522 인 조성물.
CaO and SO 3 is a binder part, Al 2 O 3 and MgO is a control unit for controlling the solidification rate of the binder, the composition ratio of a binder portion and the control unit is (CaO + SO3) / (Al 2 O 3 + MgO) = 2.39 ≪ / RTI >
KR1020140066024A 2014-05-30 2014-05-30 Injection for soil and Ground reinforcement composite using Mg-Al inorganic powder system KR20150137699A (en)

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