JP2008030991A - Spray mortar mixed with composite recycled materials and slope protection construction method - Google Patents

Spray mortar mixed with composite recycled materials and slope protection construction method Download PDF

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JP2008030991A
JP2008030991A JP2006206026A JP2006206026A JP2008030991A JP 2008030991 A JP2008030991 A JP 2008030991A JP 2006206026 A JP2006206026 A JP 2006206026A JP 2006206026 A JP2006206026 A JP 2006206026A JP 2008030991 A JP2008030991 A JP 2008030991A
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mortar
fine aggregate
mixed
slope protection
spraying
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Yasuhiro Michimasa
泰弘 道正
Toshio Kumagai
俊雄 熊谷
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Tokyo Electric Power Company Holdings Inc
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Tokyo Electric Power Co Inc
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    • 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
    • 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
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spray mortar using composite recycled materials which is available at a low cost, exhibits a sufficient strength required for slope protection and easy to work with. <P>SOLUTION: The spray mortar is manufactured by mixing cement C, water W, an admixture and a fine aggregate to prepare a mortar base and kneading the mortar base until a flow value necessary for spraying is reached. The fine aggregate includes a regenerated fine aggregate RS produced from concrete blocks brought forth from demolished concrete structures and a crushed wooden chip T having a specific gravity lower than the regenerated fine aggregate RS. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、斜面保護用の吹付け材料等に用いて好適な複合リサイクル材混入吹付けモルタル及びそれを用いた斜面保護工法の技術に関する。   TECHNICAL FIELD The present invention relates to a composite recycled material mixed spray mortar suitable for use as a slope protection spray material and the like, and a technique of a slope protection method using the same.

吹付け材料を用いる工法として、のり面保護工法（斜面保護工法）やリサイクル緑化工法等が従来から広く知られている。のり面保護工法には、コンクリート（モルタル）を吹付けて格子型の梁を形成し、格子型の内部も吹付けコンクリート（モルタル）で保護する場合と、植生基盤を配して、のり面保護と緑化を同時に行う工法がある。これらの吹付けコンクリート（モルタル）には、バージン材（普通細骨材）が用いられている。また、同コンクリート（モルタル）に鋼繊維や有機繊維を混入し、繊維補強している例も多い。繊維の種類としては、腐食の点から有機繊維が多く用いられ、その中でも耐アルカリ性が高いビニロン繊維が多く用いられている。   As a construction method using a spray material, a slope protection method (slope protection method), a recycling greening method, and the like have been widely known. In the slope protection method, concrete (mortar) is sprayed to form lattice beams, and the interior of the lattice is protected with spray concrete (mortar), and the vegetation base is arranged to protect the slope. There is a method of performing greening and greening at the same time. A virgin material (ordinary fine aggregate) is used for these shotcretes (mortar). In many cases, steel fibers and organic fibers are mixed in the concrete (mortar) to reinforce the fibers. As the type of fiber, organic fiber is often used from the viewpoint of corrosion, and among them, vinylon fiber having high alkali resistance is often used.

リサイクル緑化工法は、木材チップを含む植生基材（木材チップ、化学肥料、遅効性肥料、種子、水、生育基盤材、他）を吹付けてのり面緑化・保護を図るものである（特許文献１参照）。   The recycling planting method is intended to replant and protect the vegetation base material (wood chips, chemical fertilizers, slow-acting fertilizers, seeds, water, growth base materials, etc.) including wood chips (Patent Document) 1).

このリサイクル緑化工法では、木材チップとして生チップ、膨軟チップまたは堆肥化チップが用いられている。膨軟チップは、伐採木等の生チップを膨軟化処理することにより、植物発芽阻害物質を飛散させ、チップの吸水率を上昇させるものである。これらに化学肥料、遅効性肥料等を混入させた基材を吹付機で吹付けることにより、のり面の緑化・保護を行うものである。生育基盤材としては、現場発生土や下水汚泥を用いるものもある。   In this recycling greening method, raw chips, softened chips or composted chips are used as wood chips. The swollen chip is for expanding the water absorption rate of the chip by scattering the plant germination inhibitor by subjecting the raw chip such as a felled tree to a softening process. By spraying a base material mixed with chemical fertilizer, slow-acting fertilizer, etc. with a spraying machine, greening and protection of the slope surface is performed. Some growth base materials use soil generated in the field or sewage sludge.

また、この類似工法として、のり面の上に木片コンクリートを吹付け施工し、その上に植生基材を積層し、緑化・斜面保護を図る工法（特許文献２）がある。木片コンクリートは木片同士をフレッシュモルタルまたはフレッシュコンクリートで相互固結させ、木片同士の間隙内まで植物根を伸張させて、のり面の緑化・保護を図るものである。
特開２００３−２７８１６３号公報 特開２００５−０３６５５３号公報 Moreover, as this similar construction method, there is a construction method (Patent Document 2) in which wood chip concrete is sprayed onto a slope surface, a vegetation base material is laminated thereon, and greening and slope protection are performed. Wood piece concrete is made by mutually solidifying wood pieces with fresh mortar or fresh concrete, and extending plant roots into the gaps between the pieces of wood, thereby greening and protecting the slope.
JP 2003-278163 A JP 2005-036553 A

（１）吹付けモルタルによるのり面保護工は、これまで一般的に行われているが、吹付けモルタルの材料においては、再生細骨材のようなリサイクル材は全く用いられておらず、資源の有効活用およびコストの面からの評価は低い。また、繊維により補強を行う場合、その繊維のコストが極めて高い。 (1) Although the slope protection work using sprayed mortar has been generally performed, recycled materials such as recycled fine aggregates are not used at all in the material of sprayed mortar, and resources The evaluation from the viewpoint of effective utilization and cost is low. Moreover, when reinforcing with a fiber, the cost of the fiber is very high.

（２）リサイクル緑化工法では、間伐材、風倒木等のチップを用いており、木材のリサイクルが考慮されている。ただし、同工法は、植生基材を直接地山に吹付け、斜面緑化・保護を図るためのものであり、植生基材はのり面保護に必要な強度を持ち合わせていない。従って、地山の安定が低い場合は、適用が出来ない。木片コンクリートを用いるものも、同コンクリート施工の目的は、植生基材の下地材と植物根の伸張であり、のり面保護工法のような強度は確保出来ない。 (2) The recycling tree planting method uses chips such as thinned wood and wind-fall trees, and the recycling of wood is considered. However, this method is for spraying the vegetation base material directly onto the natural ground to plant and protect slopes, and the vegetation base material does not have the strength necessary to protect the slope. Therefore, it cannot be applied when the stability of the natural ground is low. In the case of using wood chip concrete, the purpose of the concrete construction is to stretch the base material of the vegetation base material and the plant root, and it is not possible to ensure the strength as in the slope protection method.

（３）再生細骨材と解体木材チップの様な複合リサイクル材を用いた吹付けモルタルによるのり面保護は、これまで例が無く、また、このような吹付けモルタルの配合法は確立さ
れていない。 (3) There is no example of the protection of the slope by spraying mortar using composite recycled materials such as recycled fine aggregate and dismantled wood chips, and the method of blending such spraying mortar has been established. Absent.

即ち、上記した従来技術においては、次のような課題がある。のり面保護工では、リサイクル材は全く用いられておらずコストも高い。リサイクル緑化工法では、木材のリサイクルが考慮されているが、この工法はのり面の緑化が主目的であり、強度的に補強が必要なのり面には適用できない。複合リサイクル材を用いた吹付けモルタルによるのり面保護工は、これまで例が無い。   That is, the above-described conventional technology has the following problems. In the slope protection work, recycled materials are not used at all and the cost is high. The recycling greening method considers the recycling of wood, but this method is mainly intended for greening of the slope and cannot be applied to the slope that requires reinforcement. There are no examples of slope protection work using sprayed mortar using composite recycled materials.

よって、本発明は、複合リサイクル材を用いることで、低コストで提供できる上に、斜面保護に必要な充分な強度も発揮させることができ、更に、良好な施工性も確保できる複合リサイクル材を用いた吹付けモルタル及び斜面保護工法を提供することを課題とする。   Therefore, the present invention provides a composite recycled material that can be provided at a low cost by using the composite recycled material, can exhibit sufficient strength necessary for slope protection, and can secure good workability. It is an object to provide a used spray mortar and a slope protection method.

前記課題を解決するため、本発明では以下の手段を採用した。
本発明は、セメントと、水と、混和剤と、細骨材とを含むモルタル基材を、吹付けに必要なフロー値に混練した吹付けモルタルであって、
前記細骨材は、コンクリート構造物等の解体コンクリート塊から製造された再生細骨材と、その再生細骨材よりも比重の小さい解体木材チップとを含むことを特徴としている。 In order to solve the above-mentioned problems, the present invention employs the following means.
The present invention is a spray mortar in which a mortar base material containing cement, water, an admixture, and fine aggregate is kneaded to a flow value necessary for spraying,
The fine aggregate includes a recycled fine aggregate manufactured from a demolished concrete block such as a concrete structure and a demolished wood chip having a specific gravity smaller than that of the recycled fine aggregate.

本発明によれば、モルタル基材の細骨材に、再生細骨材とそれよりも比重の小さい解体木材チップとを用いることで、吹付けに必要な良好な圧送性や連続性（施工性）を確保しつつ、斜面保護（斜面保護材）に必要な充分な強度も発揮させることができる。また、再生細骨材および解体木材を複合的に使用することにより、リサイクル材の利用率を高め、高度な資源有効活用を図ることができる。さらに、再生細骨材のみを使用した場合は、普通細骨材（バージン材）を利用した場合に比べてコストが高くなるが、解体木材チップを混入することにより、バージン材より安価になり、その分、低コスト化を図ることができる。   According to the present invention, by using a recycled fine aggregate and a demolished wood chip having a specific gravity smaller than that of the fine aggregate of the mortar base material, good pumpability and continuity necessary for spraying (constructability) ) And sufficient strength necessary for slope protection (slope protection material) can be exhibited. In addition, by using recycled fine aggregate and demolished wood in combination, the utilization rate of recycled materials can be increased, and advanced effective use of resources can be achieved. In addition, when only recycled fine aggregate is used, the cost is higher than when using ordinary fine aggregate (virgin material), but by disassembling wood chips, it becomes cheaper than virgin material, The cost can be reduced accordingly.

本発明において、前記解体木材チップは、前記モルタル基材に混入する前に膨軟化処理されていることが望ましい。このように膨軟化処理された解体木材チップは、吸水率が上昇し、柔軟性も加わるため、吹付けモルタル自体に必要な流動性（圧送性、連続性）を向上させる作用を発揮する。従って、この複合リサイクル材混入吹付けモルタルでは、解体木材チップを混入しないものに比べて、特に吹付け時の施工性が良くなる。   In the present invention, it is desirable that the dismantled wood chip is swelled and softened before being mixed into the mortar base material. The dismantled wood chips that have been swelled and softened in this way have increased water absorption and added flexibility, and therefore exhibit the effect of improving the fluidity (pumping property, continuity) required for the spraying mortar itself. Therefore, in this composite recycled material mixed spraying mortar, workability at the time of spraying is particularly improved as compared with the case where no demolished wood chips are mixed.

本発明においては、前記モルタル基材に混入する解体木材チップの単位量が２５０ｋｇ／ｍ3 以下であることが望ましい。このモルタル基材に混入する解体木材チップの単位量が２５０ｋｇ／ｍ3 以上の場合でも吹付け時の施工性は確保できる。しかし、解体木材チップの単位量が多いほど圧縮強度は低下する。従って、モルタル基材に混入する解体木材チップの単位量は、基本的には設計基準強度との関係において決定されるが、斜面保護用吹付け材料として用いる場合には、モルタル基材に混入する解体木材チップの単位量を２５０ｋｇ／ｍ3 以下とすることが好ましく、更に好ましくは、１００ｋｇ／ｍ3 前後である。この場合には、得られる斜面保護材を設計基準強度の範囲内とすることが可能になるからである。 In the present invention, it is desirable that the unit amount of the demolished wood chips mixed in the mortar base material is 250 kg / m 3 or less. Even when the unit amount of the demolished wood chips mixed in the mortar base material is 250 kg / m 3 or more, the workability at the time of spraying can be secured. However, the greater the unit amount of dismantled wood chips, the lower the compressive strength. Therefore, the unit amount of demolition wood chips mixed into the mortar base is basically determined in relation to the design standard strength, but when used as a slope protection spray material, it is mixed into the mortar base. The unit amount of the demolished wood chip is preferably 250 kg / m 3 or less, more preferably around 100 kg / m 3 . In this case, it is possible to make the obtained slope protective material within the design standard strength range.

本発明によれば、複合リサイクル材を用いることで、低コストで提供できる上に、斜面保護に必要な充分な強度も発揮させることができ、更に、良好な施工性も確保できる複合リサイクル材を用いた吹付けモルタル及び斜面保護工法を提供することができる。   According to the present invention, it is possible to provide a composite recycled material that can be provided at a low cost by using the composite recycled material, can exhibit sufficient strength necessary for slope protection, and can secure good workability. The used spray mortar and slope protection method can be provided.

以下、本発明の好適な実施例について、図面を参照して説明する。なお、以下の実施例では、本発明の複合リサイクル材混入吹付けモルタルを斜面保護用の吹付け材料として使用する場合に好適な例について説明する。   Preferred embodiments of the present invention will be described below with reference to the drawings. In the following examples, examples suitable for the case where the composite recycled material mixed spray mortar of the present invention is used as a spray material for slope protection will be described.

図１は、再生細骨材および解体木材チップを混入して、複合リサイクル材混入吹付けモルタルを製造する工程およびそれを用いた吹付け工程（斜面保護工法）を示すフローチャートである。この実施例では、セメント、混和剤、および水を含むモルタル基材に、再生細骨材（低コスト）と、解体木材チップ（低コスト）を混入してミキシングする。この再生細骨材と解体木材チップの混入に際しては、後述する相対品質値法を適用した材料設計に基づいて行う。材料のミキシングは、専用のミキサーや、例えば図３に示すような攪拌装置搭載の吹付機にてミキシングする。この吹付機でミキシングする場合、材料をミキシングしつつ、それを地山斜面等の吹付け対象に吹付ける工程を行う。これにより、斜面保護工としての所要性能を確保し、解体木材チップ混入に伴う施工性の向上を図り、しかもこれを低コストで実現することが可能になる。次いで、これらの詳細を実験例に基づいて説明する。   FIG. 1 is a flowchart showing a process of producing a composite recycled material mixed spraying mortar by mixing recycled fine aggregate and dismantled wood chips and a spraying process (slope protection method) using the process. In this embodiment, regenerated fine aggregate (low cost) and dismantled wood chips (low cost) are mixed in a mortar base material containing cement, an admixture and water. The mixing of the recycled fine aggregate and the demolished wood chip is performed based on a material design to which a relative quality value method described later is applied. The mixing of the materials is performed by a dedicated mixer or a sprayer equipped with a stirring device as shown in FIG. When mixing with this spraying machine, the process which sprays it on spraying objects, such as a natural slope, is performed, mixing a material. As a result, it is possible to ensure the required performance as a slope protection work, improve the workability associated with the dismantling wood chip mixing, and realize this at a low cost. Next, these details will be described based on experimental examples.

コンクリート塊リサイクルの用途拡大を目的に、構造物の解体コンクリート塊から製造された再生細骨材を用い、さらにチップ化した解体木材を混入した吹付けモルタルについて、斜面保護材への適用性について実験的検討を行った。ここでは、吹付け前のベースモルタルにおいて配合検討を行い、得られた配合において施工試験を行い、諸性質を評価した結果を示す。   Experiment on applicability to slope protection using sprayed mortar containing recycled fine aggregate made from demolition concrete lump of structure and mixed with chipped demolition wood for the purpose of expanding the use of concrete lump recycling Examination was conducted. Here, the mixing | blending examination was performed in the base mortar before spraying, the construction test was done in the obtained mixing | blending, and the result of having evaluated various properties is shown.

＜配合検討＞
（１）使用材料
表１に使用材料の概要を示す。再生細骨材は、解体建物の内壁を原コンクリートとして、再生粗骨材の最大寸法２５ｍｍで製造した場合により得られたものを用いた。解体木材はチップ状に破砕し、さらに膨軟化処理したものを用いた。 <Consideration>
(1) Materials used Table 1 outlines the materials used. As the recycled fine aggregate, the one obtained by using the inner wall of the demolished building as the raw concrete and the maximum size of the recycled coarse aggregate being 25 mm was used. The demolished wood was crushed into chips and further swelled and softened.

Figure 2008030991
Figure 2008030991

（２）配合設計
設計条件：吹付けモルタルの配合検討は、表２に示す６水準の配合(ベース配合)を用いた。設計基準強度は、土木学会指針（案）に基づき、従来から斜面保護工に多く採用されている１５〜１８Ｎ／ｍｍ2 とし、配合強度は、設計基準強度と目標強度の関係から２５〜２７Ｎ／ｍｍ2 に設定した。 (2) Blending design Design conditions: For the blending examination of sprayed mortar, six levels of blending (base blending) shown in Table 2 were used. The design standard strength is 15 to 18 N / mm 2 that has been widely used in slope protection work based on the Japan Society of Civil Engineers guidelines (draft), and the compounding strength is 25 to 27 N / m from the relationship between the design standard strength and the target strength. Set to mm 2 .

Figure 2008030991
Figure 2008030991

練混ぜ方法：公称容量６０リットルの強制２軸型ミキサーを用い、細骨材、セメント、解体木材チップを投入し、３０秒の空練りを行った後、水を加え１２０秒練混ぜを行った。   Mixing method: Using a forced biaxial mixer with a nominal capacity of 60 liters, fine aggregate, cement, and dismantled wood chips were added, and after 30 seconds of air mixing, water was added and mixing was performed for 120 seconds. .

（３）ベースモルタルの性質
フレッシュ性状：表２にベース配合の吹付けモルタル(ベースモルタル)の実測フロー値を示す。全ての配合で目標値以内であった。また、目視観察の結果から、解体木材チップ混入量が１００ｋｇ／ｍ3 以下であれば、普通骨材とほぼ同等の施工性が得られるものと推測した。なお、表１〜表４において、水をＷ、セメントをＣ、解体木材チップをＴ、細骨材のうち普通細骨材をＮＳ、再生細骨材をＲＳの記号でそれぞれ示す。 (3) Properties of base mortar Fresh properties: Table 2 shows the measured flow values of spray mortar (base mortar) containing the base. All formulations were within target values. Also, from the result of visual observation, it was estimated that if the amount of dismantled wood chips mixed was 100 kg / m 3 or less, workability almost equivalent to that of ordinary aggregate was obtained. In Tables 1 to 4, water is indicated by W, cement is indicated by C, dismantled wood chips are indicated by T, ordinary fine aggregate among fine aggregates is indicated by NS, and regenerated fine aggregate is indicated by RS.

硬化性状：図２に、ベースモルタルにおける材齢と圧縮強度の関係を示す。配合ＲＳ−Ｔ０（解体木材チップＴ＝０の場合）を除くと、材齢および骨材の種類にかかわらず、解体木材チップ混入量の増加に伴い低下し、混入量２５０ｋｇ／ｍ3 以上になると設計基準強度を下回った。ＲＳ−Ｔ０はＮＳ−Ｔ０に比べ、再生細骨材混入の影響により、圧縮強度は低下する傾向がみられる。 Curing property: FIG. 2 shows the relationship between the age of the base mortar and the compressive strength. Excluding compounding RS-T0 (when demolished wood chip T = 0), regardless of the age and type of aggregate, it decreases with an increase in the amount of demolished wood chips, and when the amount exceeds 250 kg / m 3 It was below the design standard strength. RS-T0 tends to have a lower compressive strength than NS-T0 due to the effects of mixed fine aggregate.

＜施工性検討＞
上記の配合検討結果をふまえて、表２に示す４配合に対して施工性の確認を行った。試験概要は以下の通りである。 <Examination of workability>
Based on the results of the above formulation studies, workability was confirmed for the four formulations shown in Table 2. The outline of the test is as follows.

（１）試験方法
図３に示すように、試験用型枠にモルタルを吹付け、施工性を目視観察により評価した。また、型枠に吹付けたモルタルからコア供試体(JIS A 1107)を作成し、圧縮強度(JIS A
1107)、静弾性係数(JIS A 1149)、見掛け密度(JIS A 1108)の各試験を実施した。 (1) Test method As shown in FIG. 3, mortar was sprayed on the test mold, and the workability was evaluated by visual observation. In addition, a core specimen (JIS A 1107) was prepared from the mortar sprayed on the mold, and the compression strength (JIS A
1107), static elastic modulus (JIS A 1149), and apparent density (JIS A 1108).

（２）配合
表３に施工性の確認試験を実施した吹付けモルタルの配合を示す。施工試験の基本配合となるＮＳ−Ｔ０は、配合検討における目視観察の結果から、単位水量を１５ｋｇ／ｍ3 程度減少させた。また、再生細骨材および解体木材チップを用いた吹付けモルタルの単位水量は、同配合に比べて５〜１０ｋｇ／ｍ3 程度減少させた。 (2) Formulation Table 3 shows the formulation of sprayed mortar subjected to a workability confirmation test. NS-T0, which is the basic composition of the construction test, reduced the unit water amount by about 15 kg / m 3 from the result of visual observation in the composition study. Moreover, the unit water amount of the sprayed mortar using the regenerated fine aggregate and the dismantled wood chip was reduced by about 5 to 10 kg / m 3 as compared with the same composition.

Figure 2008030991
Figure 2008030991

＜試験結果＞
（１）施工状況
吹付けモルタルは、表４に示すとおり、練混ぜ性能には問題ないが、圧送時にマテリアルホースの脈動が多く、かつ吐出の連続性が無いことから、普通細骨材を用いた吹付けモルタルと比較すれば、やや吹付け性能に劣る。ただし、解体木材チップを混入した場合は、混入していないものに比べて、比較的良好な施工性が得られた。 <Test results>
(1) Construction status As shown in Table 4, spraying mortar has no problem in kneading performance, but because of the pulsation of the material hose during pumping and the lack of continuity of discharge, ordinary fine aggregate is used. Compared with the spraying mortar, the spraying performance is slightly inferior. However, when dismantled wood chips were mixed, relatively good workability was obtained as compared with those not mixed.

Figure 2008030991
Figure 2008030991

（２）圧縮強度および弾性係数
吹付けモルタルの圧縮強度は、図４に示すように、材齢にかかわらず、普通骨材を用いたものよりも小さく、解体木材チップ混入量の増加に伴い小さくなる傾向がみられ、１００ｋｇ／ｍ3 混入した場合で設計基準強度の下限値とほぼ同等であった。また、見掛け密度(材齢２８日)においても圧縮強度同様、解体木材チップ混入量の増加に伴い小さくなる傾向がみられ。さらに、図５に示すように、静弾性係数と圧縮強度との間にも明確な相関性が認められる。 (2) Compressive strength and elastic modulus As shown in Fig. 4, the compressive strength of sprayed mortar is smaller than that using ordinary aggregate, regardless of age, and decreases with increasing amount of demolition wood chips. When 100 kg / m 3 was mixed, it was almost equal to the lower limit value of the design standard strength. In addition, the apparent density (28 days of age) tends to become smaller as the amount of demolition wood chips increases, like the compressive strength. Further, as shown in FIG. 5, a clear correlation is recognized between the static elastic modulus and the compressive strength.

＜材料設計＞
相対品質値：使用骨材の物性値、表３に示した配合上の絶対容積から（数１）に示す相対品質値Ｑt を算出する。 <Material design>
Relative quality value: physical properties of the used aggregates, calculates the relative quality values Q t shown in absolute volume on formulations shown in Table 3 (Equation 1).

Figure 2008030991
Figure 2008030991

ここで、Ｑ1：相対品質値、ＱvＮ：普通細骨材の物性値、ＱrＮ：再生細骨材の物性値
、Ｑw：解体木材チップの物性値、ａ、ｂ、ｃ：普通細骨材、再生細骨材および解体木材
チップの絶対容積（１／ｍ3 ）をそれぞれ示す。本検討では、密度(表１：細骨材は表乾)を物性値とした。 Here, Q 1 : Relative quality value, Q v N: Physical property value of ordinary fine aggregate, Q r N: Physical property value of recycled fine aggregate, Q w : Physical property value of dismantled wood chip, a, b, c: The absolute volumes (1 / m 3 ) of ordinary fine aggregate, regenerated fine aggregate and dismantled wood chips are shown respectively. In this study, the density (Table 1: fine aggregate is surface dry) was used as a physical property value.

吹付けモルタルの諸性質との関係：骨材置換法による再生骨材コンクリートの諸性質は、骨材の相対品質値（吸水率、密度等）との間に明確な相関性を示す事が判明している
。吹付けモルタルにおいても、図６に示すように、相対密度と圧縮強度および静弾性係数との間で明確な相関関係が認められることから、相対品質値法に基づく材料設計が可能である。 Relationship with properties of sprayed mortar: It was found that the properties of recycled aggregate concrete obtained by the aggregate replacement method show a clear correlation with the relative quality values (water absorption, density, etc.) of the aggregate. is doing
. Also in the spraying mortar, as shown in FIG. 6, since a clear correlation is recognized between the relative density, the compressive strength, and the static elastic modulus, the material design based on the relative quality value method is possible.

＜まとめ＞
再生細骨材および解体木材チップを用いた斜面保護材用の吹付けモルタルへの適用性について検討を行った。
（１）再生細骨材を用いた吹付けモルタルは、いずれの配合においても吹付け性が低下したが、解体木材チップを混入することにより、改善される傾向がみられた。
（２）再生細骨材を用いた吹付けモルタルの圧縮強度および静弾性係数は、普通骨材を用いた場合よりも小さく、また、解体木材チップ混入量の増加に伴い低下する傾向を示した。
（３）再生細骨材、解体木材チップによる相対密度と主要性質の間には、明確な相関性が認められるため、吹付けモルタルでも、相対品質値法に基づく材料設計が可能である。 <Summary>
The applicability of sprayed mortar for slope protection using recycled fine aggregate and dismantled wood chips was investigated.
(1) The spraying mortar using the regenerated fine aggregates showed a tendency to be improved by mixing the dismantled wood chips, although the sprayability decreased in any formulation.
(2) The compressive strength and static elastic modulus of sprayed mortar using recycled fine aggregates were smaller than those using ordinary aggregates, and showed a tendency to decrease as the amount of demolition wood chips mixed in increased. .
(3) Since there is a clear correlation between the relative density and main properties of recycled fine aggregates and dismantled wood chips, material design based on the relative quality value method is possible even with sprayed mortar.

なお、以上の実施例では、本発明を斜面保護用の吹付け材料および斜面保護工法に適用した例を示したが、吹付け対象が斜面に限らず、適宜な強度の保護工を必要とする平坦面などに対しても、本発明を適用することができる。   In addition, although the example which applied this invention to the spraying material for slope protection, and the slope protection construction method was shown in the above Example, the spraying object is not restricted to a slope, The protection work of appropriate intensity | strength is required. The present invention can be applied to a flat surface.

本発明の実施例に係るフローチャート。The flowchart which concerns on the Example of this invention. 本発明の実施例に係るベースモルタルの圧縮強度をグラフで示す図。The figure which shows the compressive strength of the base mortar which concerns on the Example of this invention with a graph. 本発明の実施例に係る施工性試験概要を示す説明図。Explanatory drawing which shows the workability test | summary outline | summary which concerns on the Example of this invention. 本発明の実施例に係る吹付けモルタルの圧縮強度・見掛け密度をグラフで示す図。The figure which shows the compressive strength and the apparent density of the spraying mortar which concerns on the Example of this invention with a graph. 本発明の実施例に係る吹付けモルタルの圧縮強度と静弾性係数の関係を示す図。The figure which shows the relationship between the compressive strength of the spraying mortar which concerns on the Example of this invention, and a static elastic modulus. 本発明の実施例に係る吹付けモルタルの相対密度と圧縮強度および静弾性係数の関係を示す図。The figure which shows the relationship between the relative density of the spraying mortar which concerns on the Example of this invention, compressive strength, and a static elastic modulus.

符号の説明Explanation of symbols

ＮＳ 普通細骨材
ＲＳ 再生細骨材
Ｔ 解体木材チップ
Ｃ セメント
Ｗ 水

NS Normal fine aggregate RS Recycled fine aggregate T Demolition wood chip C Cement W Water

Claims (5)

セメントと、水と、混和剤と、細骨材とを含むモルタル基材を、吹付けに必要なフロー値に混練した吹付けモルタルであって、
前記細骨材は、コンクリート構造物等の解体コンクリート塊から製造された再生細骨材と、その再生細骨材よりも比重の小さい解体木材チップとを含む、複合リサイクル材混入吹付けモルタル。 A spray mortar obtained by kneading a mortar base material containing cement, water, an admixture, and fine aggregate to a flow value necessary for spraying,
The said fine aggregate is a composite recycled material mixing spray mortar containing the reproduction | regeneration fine aggregate manufactured from the demolition concrete lump, such as a concrete structure, and the demolition wood chip whose specific gravity is smaller than the reproduction | regeneration fine aggregate. 前記解体木材チップは、前記モルタル基材に混入する前に膨軟化処理されている、請求項１に記載の複合リサイクル材混入吹付けモルタル。   The composite recycled material mixed sprayed mortar according to claim 1, wherein the dismantled wood chip is swelled and softened before being mixed into the mortar base material. 前記モルタル基材に混入する解体木材チップの単位量が２５０ｋｇ／ｍ3 以下である、請求項１又は請求項２に記載の複合リサイクル材混入吹付けモルタル。 The composite recycled material mixed sprayed mortar according to claim 1 or 2, wherein a unit amount of the demolished wood chips mixed in the mortar base material is 250 kg / m 3 or less. 前記モルタル基材に混入する解体木材チップの単位量が１００ｋｇ／ｍ3 前後である、請求項１又は請求項２に記載の複合リサイクル材混入吹付けモルタル。 The composite recycled material mixed sprayed mortar according to claim 1 or 2, wherein a unit amount of the demolished wood chips mixed in the mortar base material is around 100 kg / m 3 . 請求項１〜請求項４の何れかに記載の複合リサイクル材混入吹付けモルタルを、吹付け機を用いて斜面に吹付けることを特徴とする、斜面保護工法。   A slope protection construction method, wherein the composite recycled material mixed spray mortar according to any one of claims 1 to 4 is sprayed onto a slope using a spraying machine.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015210121A (en) * 2014-04-24 2015-11-24 住友大阪セメント株式会社 Quality control method of pneumatically-applied mortar

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63236740A (en) * 1987-03-26 1988-10-03 江上　外人 Manufacture of excelsior concrete
JPH107475A (en) * 1996-06-19 1998-01-13 Sk Kaken Co Ltd Refractory heat insulating material
JPH10279336A (en) * 1997-04-01 1998-10-20 Techno Sakato:Kk Method for recycling demolished building waste and system therefor
JP2001213660A (en) * 2000-01-28 2001-08-07 Nichiha Corp Woody cement board
JP2001213657A (en) * 2000-01-31 2001-08-07 Nichiha Corp Woody cement board and method of manufacturing it
JP2002128555A (en) * 2000-10-16 2002-05-09 Denki Kagaku Kogyo Kk Quick-setting shot blasting concrete cement and method of shot blasting using the same
JP2002241163A (en) * 2001-02-09 2002-08-28 Koa Funenban Kogyo Kk Method for constructing mortar or concrete structure
JP2003171158A (en) * 2001-12-05 2003-06-17 Fuyo Gas Kogyo Kk Artificial solid member and method for producing the same
JP2003278163A (en) * 2002-03-22 2003-10-02 Green Engineering:Kk Slope greening method
JP2004161548A (en) * 2002-11-14 2004-06-10 Ohbayashi Corp Method of producing wood chip concrete for spraying
JP2004313134A (en) * 2003-04-21 2004-11-11 Hoyo Kensetsu:Kk Water retention mat produced by using wood chip and greening method
JP2004331484A (en) * 2003-05-12 2004-11-25 Iwao Inudo Raw material for concrete

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63236740A (en) * 1987-03-26 1988-10-03 江上　外人 Manufacture of excelsior concrete
JPH107475A (en) * 1996-06-19 1998-01-13 Sk Kaken Co Ltd Refractory heat insulating material
JPH10279336A (en) * 1997-04-01 1998-10-20 Techno Sakato:Kk Method for recycling demolished building waste and system therefor
JP2001213660A (en) * 2000-01-28 2001-08-07 Nichiha Corp Woody cement board
JP2001213657A (en) * 2000-01-31 2001-08-07 Nichiha Corp Woody cement board and method of manufacturing it
JP2002128555A (en) * 2000-10-16 2002-05-09 Denki Kagaku Kogyo Kk Quick-setting shot blasting concrete cement and method of shot blasting using the same
JP2002241163A (en) * 2001-02-09 2002-08-28 Koa Funenban Kogyo Kk Method for constructing mortar or concrete structure
JP2003171158A (en) * 2001-12-05 2003-06-17 Fuyo Gas Kogyo Kk Artificial solid member and method for producing the same
JP2003278163A (en) * 2002-03-22 2003-10-02 Green Engineering:Kk Slope greening method
JP2004161548A (en) * 2002-11-14 2004-06-10 Ohbayashi Corp Method of producing wood chip concrete for spraying
JP2004313134A (en) * 2003-04-21 2004-11-11 Hoyo Kensetsu:Kk Water retention mat produced by using wood chip and greening method
JP2004331484A (en) * 2003-05-12 2004-11-25 Iwao Inudo Raw material for concrete

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015210121A (en) * 2014-04-24 2015-11-24 住友大阪セメント株式会社 Quality control method of pneumatically-applied mortar

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