JP2007131804A - Soil backfilling material - Google Patents

Soil backfilling material Download PDF

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JP2007131804A
JP2007131804A JP2005328329A JP2005328329A JP2007131804A JP 2007131804 A JP2007131804 A JP 2007131804A JP 2005328329 A JP2005328329 A JP 2005328329A JP 2005328329 A JP2005328329 A JP 2005328329A JP 2007131804 A JP2007131804 A JP 2007131804A
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concrete
cement
ground
sludge water
water
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Shin Uchiyama
伸 内山
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a backfilling filler that is produced by effectively utilizing sludge water occurring in facility cleaning after placing concrete and extremely fine powder as a recycled material of demolished concrete. <P>SOLUTION: The soil backfilling material is a filler in a slurried state obtained by adding sludge water as cleaning drainage of concrete placing facilities to a hydraulic solidifer composed of granule having ≤5 mm particle diameter produced as a by-product in the production of recycled aggregate and cement or a cement-based solidifier. The filler is filled into a ground space of backfilling target and solidified. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は掘削地盤の地盤埋戻し材に係り、コンクリート打設後の設備洗浄時に発生するスラッジ水および解体コンクリートのリサイクル材料としての微粒微粉体を用いて、良好な充填性を有した充填材として使用し、充填、固化後は所定の材料強度を確保できるようにした地盤埋戻し材に関する。   The present invention relates to a ground backfill material for excavated ground, using sludge water generated when washing equipment after placing concrete and fine fine powder as a recycled material for demolition concrete, The present invention relates to a ground backfill material that can ensure a predetermined material strength after use, filling, and solidification.

従来、地盤掘削を行い、地下部分に構造物を構築するような建設工事では、山留め空間に構築された地中構造物の周囲や所定の土被り部分に相当する地盤空間に埋戻し材料による埋戻し作業が必要になってくる。通常、埋戻し材料としては、埋戻しに好適な現場発生土であれば、掘削土を用いたり、必要に応じて良質な購入砂が用いられている。また、地中構造物の周囲地盤に所定の強度が求められるような場合には、少量のセメント系固化材を混合した地盤材料が使われていた。   Conventionally, in construction work in which ground excavation is performed and a structure is constructed in the underground part, the underground space around the underground structure constructed in the mountain retaining space and the ground space corresponding to the predetermined soil covering part are filled with backfill material. Return work will be required. Usually, as the backfill material, excavated soil is used as long as it is a site-generated soil suitable for backfilling, or high-quality purchased sand is used as necessary. In addition, when a predetermined strength is required for the ground around the underground structure, a ground material mixed with a small amount of cement-based solidifying material has been used.

これらの地盤材料で埋め戻す場合、材料の圧密や狭隘部への充填不良などにより、地盤沈下や亀裂、陥没が発生することもあった。そこで、これらの地盤材料には、地盤としての安定性(強度および剛性)とともに、原地盤との連続性を確保するため、適切な強度(一軸圧縮強さで１００〜４００kN/m2程度)を持つことが求められている。一般に土砂のみでこの強度を得ることができないため、上述のように、少量のセメント系固化材を粉体で添加する混合撹拌工法が行われることが多い。 When refilling with these ground materials, ground subsidence, cracks, and depressions may occur due to material compaction or poor filling of narrow areas. Therefore, in order to ensure the stability (strength and rigidity) of the ground as well as the continuity with the original ground, these ground materials have appropriate strength (uniaxial compressive strength of about 100 to 400 kN / m 2 ). It is required to have. In general, since this strength cannot be obtained only by earth and sand, as described above, a mixed stirring method in which a small amount of cement-based solidifying material is added in powder is often performed.

しかし、混合撹拌工法の実態を考慮すると、対象土１．０m3に対してセメント系固化材を１００kg程度以上添加しないと均質な材料が得られず、その結果、実際には想定強度の５倍以上の過度な強度が発現することも多かった。貧配合のコンクリート(ラップルコンクリート)を流し込んで埋め戻すことも行われるが、その強度は一軸圧縮強さで１０MN/m2以上となることが多く、地盤として過大な強度の地盤材料であった。このように、人工的な地盤構築に際し、妥当な材料品質(安定性)と施工品質(充填性など)を両立することは難しく、適切な地盤材料およびその配合技術が望まれていた。 However, in consideration of the actual condition of the mixed agitation method, a homogeneous material cannot be obtained unless about 100 kg or more of cement-based solidifying material is added to 1.0 m 3 of the target soil. The above excessive strength was often expressed. Poor blended concrete (lapple concrete) is also poured and backfilled, but the strength is often 10 MN / m 2 or more in terms of uniaxial compressive strength, and it was a ground material with excessive strength as the ground. Thus, in constructing artificial ground, it is difficult to achieve both reasonable material quality (stability) and construction quality (fillability, etc.), and an appropriate ground material and its blending technology have been desired.

適正な地盤強度を得るため、および材料リサイクルの観点から、使用材料としてコンクリートミキサ車のコンクリート荷室（ドラム）等の設備を洗浄した後に発生するスラッジ水を、所定濃度に濃縮して所定配合で砂、セメントと混合して充填材等として利用する提案もされている(特許文献１)。   In order to obtain appropriate ground strength and from the viewpoint of material recycling, sludge water generated after washing equipment such as concrete mixer trucks (drums) of concrete mixer trucks as a material to be used is concentrated to a predetermined concentration and mixed with a predetermined composition. There has also been a proposal of using it as a filler by mixing with sand and cement (Patent Document 1).

また、同様に、材料リサイクルの観点から、解体コンクリートの再生処理過程で発生する５mm以下の微粒分および比表面積が４，０００cm2/g以上の微粉末(以下、これらを微粒微粉と記す)を用いた土質改良材がある。微粒微粉は主に硬化したセメント成分からなり、砂や砂利の破砕粉が一部混合している。したがって、微粒微粉の性状としては、含有する材料の性質から吸水性や若干の自己硬化性を有することが確認されており、この性状を利用して所定強度を発揮できる地盤改良材などへの利用が考えられる。 Similarly, from the viewpoint of material recycling, fine particles of 5 mm or less and specific surface area of 4,000 cm 2 / g or more (hereinafter referred to as fine particles) generated during the recycling process of demolition concrete. There is a soil improvement material used. Fine-grained fine powder is mainly composed of hardened cement components, and is partially mixed with crushed sand and gravel. Therefore, as the properties of the fine particles, it has been confirmed from the properties of the materials to be contained that it has water absorption and some self-curing properties. Can be considered.

すでに、出願人は、上述の微粒微粉の性状に関して、解体コンクリートから砂や砂利を再生する高度処理のひとつである「加熱すりもみ処理」過程で発生する微粒微粉のうち、特に微粉の性状に着目して開発を進め、単独の微粉（Ｐ）またはセメント系固化材（Ｃ）を添加した状態で軟弱土の土質改良材として利用することを提案している(特許文献２)。また、微粉とセメントとを一定の配合で混合して水を添加して練り上げたスラリー状の充填材を製造し、擁壁構造の背面や山留め空間内の地中構造物の埋戻し材料として利用することも提案している(特許文献３）。   The applicant has already focused on the properties of the fine powder among the fine powder generated in the process of “heating and grinding”, which is one of the advanced treatments for reclaiming sand and gravel from demolition concrete. It has been proposed to use it as a soil improvement material for soft soil in a state where a single fine powder (P) or cement-based solidifying material (C) is added (Patent Document 2). Also, a slurry-like filler is prepared by mixing fine powder and cement with a certain composition, adding water and kneading, and used as a backfill material for underground structures in the back of retaining walls and in retaining spaces It has also been proposed (Patent Document 3).

特開平１０−１０２０５７号公報JP 10-102057 A 特開２００４−１１５９９９号公報JP 2004-115999 A 特開２００４−２１８３３６号公報JP 2004-218336 A

ところで、上述の特許文献１に記載された発明では、砂、砂利が分離されたスラッジ水を、含有固形分が２０〜３０％となるように所定の濃度管理手法に沿って調製される。このため、スラッジ水は地盤改良用の充填材の混合水と使用する際、一定の濃度管理を行って取り扱わなければならなかった。一方、スラッジ水をリサイクル材料としてするためには、特許文献１に述べられたような濃縮スラッジ水でなく、清掃後に発生したスラッジ水をそのまま混練り水として用いたいという要望が強い。このような場合、スラッジ水は製造したレディミクストコンクリートの配合の相違によって、その残存成分が様々であるため、スラッジ水を混練り水として使用する場合、なるべくスラッジ水に含有される残存成分に依存されないことが必要である。   By the way, in the invention described in the above-mentioned Patent Document 1, sludge water from which sand and gravel are separated is prepared according to a predetermined concentration management method so that the contained solid content is 20 to 30%. For this reason, sludge water must be handled with a certain concentration control when used with mixed water for ground improvement filler. On the other hand, in order to use sludge water as a recycled material, there is a strong demand for using sludge water generated after cleaning as it is as kneaded water, instead of concentrated sludge water as described in Patent Document 1. In such a case, the remaining components of sludge water vary depending on the composition of the ready-mixed concrete produced. Therefore, when sludge water is used as kneaded water, it depends on the remaining components contained in the sludge water as much as possible. It is necessary not to be done.

また、リサイクル材料としての上述の微粒微粉は、セメント等を含有しているため水硬性が期待できる。このため、特許文献１の砂に代えてセメントまたはセメント系固化材を混合する際に、所定配合で添加すると、所定のフロー値を確保して、良好な材料分離抵抗性が向上する点が確認できた。その際、清掃後の砂、砂利、セメント固形物が残留したままのスラッジ水をそのまま用いても十分な材料分離抵抗性が得られる。   Moreover, since the above-mentioned fine particles as a recycled material contain cement and the like, hydraulic properties can be expected. For this reason, it is confirmed that when mixing cement or cement-based solidifying material instead of sand of Patent Document 1 and adding in a predetermined composition, a predetermined flow value is secured and good material separation resistance is improved. did it. In that case, sufficient material separation resistance can be obtained even if the sludge water in which the sand, gravel and cement solids after cleaning remain is used as it is.

さらに、特許文献１に記載された砂等に代えて、自己硬化性を有する微粒微粉を用いることで、特許文献１で用いた濃縮スラッジ水のように、濃縮されたスラッジ成分が充填材料の強度発現の一部を負担することを定量的に考える必要がなく、セメントやセメント系固化材の配合が少ない配合で、構造物背面等の埋戻し充填時には良好な充填性能を確保し、かつ固化後は所要強度が得られる地盤埋戻し材料を提供できることが期待できる。   Furthermore, instead of sand or the like described in Patent Document 1, by using fine particles having self-curing properties, the concentrated sludge component, like the concentrated sludge water used in Patent Document 1, has the strength of the filling material. There is no need to consider a part of the expression quantitatively, and it is a compound with a small amount of cement or cement-based solidifying material, ensuring good filling performance when backfilling the structure backside, etc., and after solidification Can be expected to provide a ground backfill material with the required strength.

そこで、本発明の目的は上述した従来の技術を踏まえ、以上の問題点を解消すべく、解体コンクリートから得られた微粒微粉とセメント、セメント系固化材と、スラッジ水とを所定の配合のもとで製造するようにした地盤埋戻し材を提供することにある。   Therefore, the object of the present invention is based on the above-described conventional technology, and in order to solve the above-mentioned problems, fine particles obtained from demolished concrete, cement, cement-based solidified material, and sludge water are provided in a predetermined composition. It is to provide a ground backfill material that is manufactured by.

上記目的を達成するために、本発明はコンクリート廃材から得られた微粒微粉と水硬性の固化材とからなる混合固化材にコンクリートスラッジ水が添加されたスラリー状をなす充填材であって、該充填材を埋戻し対象の地盤空間に充填して固化させることを特徴とする。   In order to achieve the above-mentioned object, the present invention is a filler in the form of a slurry in which concrete sludge water is added to a mixed solidified material composed of finely divided fine powder obtained from a concrete waste material and a hydraulic solidified material, It is characterized by filling the ground space to be backfilled and solidifying.

このとき、前記固化材は、セメントあるいはセメント系固化材であることが好ましく、前記微粒微粉は、前記コンクリート廃材から再生骨材を製造する際に副産される粒径５mm以下の粉粒状体であることが好ましく、さらに前記コンクリートスラッジ水は、コンクリート打設施設の洗浄排水を用いることが好ましい。   At this time, the solidified material is preferably cement or cement-based solidified material, and the fine powder is a granular material having a particle size of 5 mm or less produced as a by-product when the recycled aggregate is produced from the concrete waste material. It is preferable that the concrete sludge water is a waste water discharged from a concrete placement facility.

上述の場合、材料配合の点で、前記スラッジ水（Ｗ）と、微粒微粉および固化材（Ｐ＋Ｃ）との質量比がＷ／（Ｐ＋Ｃ）＝０．４〜１．０であること、また前記固化材（Ｃ）と、微粒微粉および固化材（Ｐ＋Ｃ）との質量比がＣ／（Ｐ＋Ｃ）＜０．２とすることが好ましい。   In the above case, in terms of material formulation, the mass ratio of the sludge water (W) to the fine particles and the solidified material (P + C) is W / (P + C) = 0.4 to 1.0. It is preferable that the mass ratio of the solidifying material (C) to the fine particles and the solidifying material (P + C) is C / (P + C) <0.2.

本発明によれば、微粒微粉とセメント等の固化材を適正に配合し、コンクリートスラッジ水を添加することで、材料分離抵抗性を有し打設時に適正な充填性を有する充填材を得られ、この充填材は固化後、仕様に応じた強度が得られる。また、材料リサイクルの観点から、解体コンクリート微粒微粉とスラッジ水を有効利用することで、各材料の建設廃棄物としての処分量低減効果を期待できる。   According to the present invention, it is possible to obtain a filler having a material separation resistance and an appropriate filling property at the time of placing by properly mixing fine particles and a solidifying material such as cement and adding concrete sludge water. After filling, this filler can have strength according to the specifications. In addition, from the viewpoint of material recycling, the effective use of dismantled concrete fine powder and sludge water can be expected to reduce the disposal amount of each material as construction waste.

以下、本発明の地盤埋戻し材の実施するための最良の形態として、以下の実施例について添付図面を参照して説明する。   Hereinafter, the following examples will be described with reference to the accompanying drawings as the best mode for carrying out the ground backfilling material of the present invention.

まず、本明細書では、「スラッジ水」とは、コンクリートを打設した後、レディミクストコンクリート工場や現場コンクリートプラントに戻ったミキサ車（アジテータ車）のコンクリート搭載ドラム内部等に残存したまだ固まらないコンクリートを洗浄、清掃した際に発生する洗浄排水と定義する。このスラッジ水には未固化セメント成分、砂、砂利が含まれている。従来は、コンクリート工場内の分級設備によってスラッジ水から砂と砂利とが分離除去されていたが、本発明では、そのまま用いることとする。その際、時間の経過とともに固形分が沈殿し、高アルカリ性の上澄み水と分離することが予想されるが、混練り水として用いる場合には、再撹拌して一様な濁水状態として用いることが好ましい。   First of all, in this specification, “sludge water” means that the concrete remains in the concrete-mounted drum of the mixer truck (agitator truck) returned to the ready-mixed concrete factory or the on-site concrete plant after placing concrete. It is defined as washing wastewater that is generated when concrete is washed and cleaned. This sludge water contains unsolidified cement components, sand and gravel. Conventionally, sand and gravel are separated and removed from sludge water by classification equipment in a concrete factory, but in the present invention, they are used as they are. At that time, it is expected that solids will precipitate with the passage of time and separate from the highly alkaline supernatant water, but when used as kneaded water, it should be re-stirred and used as a uniform turbid water state. preferable.

なお、スラッジ水はアルカリ性を呈するとともに、スラッジ水内に残存するセメントないしはセメント系固化材の存在により、同一の水粉体比、同一のセメント系固化材の添加量で比較すると、材料の固化強度の増加が期待できる。また、使用するスラッジ水は、レディミクストコンクリート工場、現場コンクリート製造プラントなど、所定配合のコンクリートを製造した後のプラント設備、打設後のミキサ車などの洗浄、清掃作業で生じる排水であれば良く、スラッジ水内に残存する砂等の骨材、セメントなどの残留分量については一切問わない。   Sludge water exhibits alkalinity, and due to the presence of cement or cement-based solidification material remaining in the sludge water, the solidification strength of the material is compared when compared with the same water powder ratio and the same cement-type solidification material addition amount. Can be expected to increase. The sludge water to be used may be wastewater generated by cleaning and cleaning operations such as ready mixed concrete factories, on-site concrete production plants, etc. Any residual amount of aggregates such as sand, cement, etc. remaining in the sludge water is acceptable.

「微粒微粉」としては、解体コンクリートを用いた再生骨材製造過程で発生する５mm以下の微粒分および比表面積が４，０００cm2/g以上の微粉末が混合された粉粒状体で取り扱うことを前提としている。なお、本発明の微粒微粉を得るための解体コンクリートの処理方法としては、上述した「加熱すりもみ方式」の他、「スクリュー磨砕方式」、「偏心ローター方式」からなる公知のコンクリート破砕装置やクラッシャー装置による処理、製造方法を適宜採用することができる。 “Fine-grained fine powder” is to be handled with a granular material in which fine particles with a specific surface area of 4,000 cm 2 / g or more and a fine particle with a specific surface area of 4,000 cm 2 / g or more generated during the production of recycled aggregate using dismantled concrete are mixed. It is assumed. In addition, as a processing method of the demolition concrete for obtaining the fine fine powder of the present invention, in addition to the above-mentioned “heated grinding method”, a known concrete crushing device including a “screw grinding method” and an “eccentric rotor method” Processing and manufacturing methods using a crusher device can be appropriately employed.

水硬性の固化材としては、普通ポルトランドセメント、高炉セメント等のセメント単体、あるいは地盤改良材として開発されている各種のセメント系地盤固化材、これらの混合粉体を適宜使用することができる。   As the hydraulic solidifying material, cement alone such as ordinary Portland cement and blast furnace cement, various cement-based ground solidifying materials developed as ground improvement materials, and mixed powders thereof can be used as appropriate.

［地盤埋戻し材の構成］
上述したスラッジ水を、微粒微粉およびセメント、セメント系固化材からなる混合固化材を所定配合で添加してスラリー状の充填材とした地盤埋戻し材について説明する。
（配合）
各材料の配合量としては、スラッジ水（以下、単に水と記す。）（Ｗ）質量と固化材粉体質量(微粒微粉とセメントまたはセメント系固化材の合計：Ｐ＋Ｃ）の水粉体比Ｗ／（Ｐ＋Ｃ）＝０．５〜１．０とすることが好ましい。同比が０．５以下であると、充填性が悪くなため、狭隘部等への充填が十分行えないおそれがある。同比が１．０以上であると、材料分離が生じたり、充填時に一部が地盤に浸透したりするおそれがある。また、仕様により固化後に一定の強度が求められている場合、強度不足が生じるおそれもある。 [Configuration of ground backfill material]
A ground backfill material in which the above-described sludge water is added as a slurry-like filler by adding a mixed solidified material composed of fine particles, cement, and cement-based solidified material in a predetermined composition will be described.
(Combination)
As a blending amount of each material, a water powder ratio W of sludge water (hereinafter simply referred to as water) (W) mass and solidified powder mass (total of fine fine powder and cement or cement-based solidified material: P + C). /(P+C)=0.5 to 1.0 is preferable. When the ratio is 0.5 or less, the filling property is poor, and therefore there is a possibility that the narrow portion or the like cannot be sufficiently filled. If the ratio is 1.0 or more, material separation may occur, or part of the material may penetrate into the ground during filling. Moreover, when a certain strength is required after solidification according to the specification, there is a possibility that the strength is insufficient.

粉体に占める主固化材、すなわちセメントまたはセメント系固化材の質量比は、セメント添加率Ｃ／（Ｐ＋Ｃ）として表した場合、Ｃ／（Ｐ＋Ｃ）＜０．２とすることが好ましい。具体的にはスラッジ水１．０m3当たりに換算すると、粉体（微粒微粉）質量１．０〜２．５t、セメントまたはセメント系固化材質量５００kg以下とすることが好ましい。このとき得られる試験体の固化強度(一軸圧縮強さｑu)は材齢２８日で２０〜５０００kN/m2となる。そして埋戻しの対象となる地盤に求められる強度を評価して埋戻し材としての強度を設定し、所定の配合を決定する。 The mass ratio of the main solidifying material in the powder, that is, cement or cement-based solidifying material, is preferably C / (P + C) <0.2 when expressed as a cement addition rate C / (P + C). Specifically, when converted to 1.0 m 3 of sludge water, it is preferable that the mass of powder (fine powder) is 1.0 to 2.5 t and the mass of cement or cement-based solidified material is 500 kg or less. The solidification strength (uniaxial compressive strength qu) of the specimen obtained at this time is 20 to 5000 kN / m 2 at a material age of 28 days. And the intensity | strength calculated | required by the ground used as the object of a backfill is evaluated, the intensity | strength as a backfill material is set, and a predetermined | prescribed mixture is determined.

［品質評価］
上述した配合で混練りされた埋戻し材料の品質の評価は、材料分離抵抗性(ブリーディング試験)、充填および圧送の施工性(フロー値測定：(JHSA313))、固化強度(一軸圧縮強さ試験)についての各試験結果をもとに行うこと好ましい。設定した配合と、適正な性状とが確認できたら、使用材料が大幅に異ならない限り、品質確認のための継続的な試験は行わなくてもよい。
（材料分離抵抗性）
図１は、水微粉比（０．５＜Ｗ／Ｐ＜１．０）と地盤埋戻し材料のブリーディング値との関係グラフである。対比のために混練り水にスラッジ水に代えて水道水を用いた場合の試験結果も示した。同図に示したように、たとえば流動化処理土のような一般的な硬化スラリー材料の許容ブリーディング値は数％以下に規定されていることから、混練り水に水道水を使うとＷ／Ｐ＝０．５以下として使用しなければならないが、スラッジ水を混練り水として用いれば、Ｗ／Ｐ＝１．０程度でも十分使用できることが確認できる。
（スラッジ水成分）
本試験に使用したスラッジ水は、現場コンクリートプラントで製造された普通コンクリートのミキサ設備の清掃で発生した洗浄水で、その残存成分は主にＣａＣＯ3、ＳｉＯ2であり、これらは当初のセメント成分と同等である。またｐＨ１２程度の強アルカリ性であった。このように、スラッジ水成分の量的な残存割合は、コンクリート工場での製造コンクリートの配合や、現場プラントごとに異なるものである。しかし、スラッジ水は、砂、砂利、セメント等固化材の残留組成の変動の影響を考慮せずに使用できるのが本発明の利点である。すなわち、スラッジ水中の残存組成が多少変動しても、吸水性の高い微粉の添加量を変化させることで埋戻し材としての品質の安定を図ることができる。なお、スラッジ水はコンクリート打設設備を洗浄する際に時間の経過に伴って残留固形分が洗い流され、残留分が減少することが予想されるが、その傾向が顕著な場合は、使用予定量のスラッジ水を洗浄直後から所定必要量に達するまで貯留槽に貯留しておき、その貯留されたスラッジ水を再利用することが好ましい。このようにすると残留組成の変動が生じないので、スラッジ水の品質の安定を図ることができる。 [quality evaluation]
Evaluation of the quality of backfill material kneaded with the above-mentioned composition is material separation resistance (bleeding test), filling and pumping workability (flow value measurement: (JHSA313)), solidification strength (uniaxial compressive strength test) ) Is preferably performed based on each test result. If the set formulation and proper properties can be confirmed, it is not necessary to perform a continuous test for quality confirmation unless the materials used are significantly different.
(Material separation resistance)
FIG. 1 is a graph showing the relationship between the water fines ratio (0.5 <W / P <1.0) and the bleeding value of the ground backfill material. For comparison, test results in the case of using tap water instead of sludge water for kneading water are also shown. As shown in the figure, for example, the allowable bleeding value of a general hardened slurry material such as fluidized soil is specified to be several percent or less. Therefore, when tap water is used for kneading water, W / P = 0.5 or less must be used, but if sludge water is used as the kneaded water, it can be confirmed that even W / P = 1.0 can be used sufficiently.
(Sludge water component)
The sludge water used in this test is wash water generated by the cleaning of ordinary concrete mixer equipment manufactured at an on-site concrete plant. The remaining components are mainly CaCO 3 and SiO 2 , which are the original cement components. Is equivalent to Moreover, it was strong alkalinity of about pH12. As described above, the quantitative residual ratio of the sludge water component varies depending on the composition of the concrete produced in the concrete factory and each site plant. However, it is an advantage of the present invention that sludge water can be used without considering the effect of changes in the residual composition of the solidified material such as sand, gravel, and cement. That is, even if the residual composition in the sludge water slightly varies, the quality of the backfill material can be stabilized by changing the amount of fine powder having high water absorption. In addition, sludge water is expected to be washed away with the passage of time when the concrete casting equipment is washed away, and the residual content is expected to decrease. It is preferable to store the sludge water in a storage tank immediately after washing until a predetermined required amount is reached, and to reuse the stored sludge water. In this way, since the residual composition does not vary, the quality of the sludge water can be stabilized.

図２は、上述と同じ成分のスラッジ水を混練り水として使用した時の水粉体比（Ｗ／（Ｐ＋Ｃ））とフロー値(JHSA313)の関係を示したグラフである。同図に示したように、通常、地盤埋戻し材として利用可能な材料のフロー値は１００〜５００mmの範囲とし、特に狭隘な部位へ充填する場合には３００〜４００mm程度とすることが望ましい。   FIG. 2 is a graph showing the relationship between the water powder ratio (W / (P + C)) and the flow value (JHSA313) when sludge water having the same components as described above is used as kneaded water. As shown in the figure, the flow value of a material that can be used as a ground backfilling material is usually in the range of 100 to 500 mm, and preferably about 300 to 400 mm when filling a narrow part.

表１は、混練り水の違い（水道水、スラッジ水）による地盤埋戻し材料の一軸圧縮強さｑu（材齢７日）の比較表である。水粉体比に関わらず、混練り水にスラッジ水を使用すると、水道水の使用に比較して一軸圧縮強さｑuは増加する。スラッジ水に含有する固化成分の寄与によるものであり、実験によれば強度増加の割合は１．３〜１．５倍見込まれる。 Table 1 is a comparison table of the uniaxial compressive strength q u (age 7 days) of the ground backfill material due to the difference in kneading water (tap water, sludge water). Regardless of the water-powder ratio, when sludge water is used as kneaded water, the uniaxial compressive strength qu increases as compared with the use of tap water. This is due to the contribution of the solidified component contained in the sludge water. According to the experiment, the rate of strength increase is expected to be 1.3 to 1.5 times.

Figure 2007131804
Figure 2007131804

同表から明らかなように、スラッジ水を混練り水として使用することにより、充填性、強度増加を見込め、さらに微粒微粉の添加により、充填性、強度増加に加え、材料分離抵抗性の向上を図ることができることが確認できる。   As can be seen from the table, sludge water can be used as kneaded water to increase filling properties and strength, and addition of fine particles can increase filling properties and strength, as well as improve material separation resistance. It can be confirmed that it can be planned.

水コンクリート微粉比とブリーディングとの関係を示したグラフGraph showing the relationship between water concrete fines ratio and bleeding 水コンクリート微粉比とフロー値との関係を示したグラフGraph showing the relationship between water concrete fine powder ratio and flow value

Claims (6)

コンクリート廃材から得られた微粒微粉と水硬性の固化材とからなる混合固化材にコンクリートスラッジ水が添加されたスラリー状をなす充填材であって、該充填材を埋戻し対象の地盤空間に充填して固化させることを特徴とする地盤埋戻し材。   It is a filler in the form of a slurry in which concrete sludge water is added to a mixed solidified material consisting of fine fine powder obtained from waste concrete and a hydraulic solidified material, and the filler is filled in the ground space to be backfilled Ground backfilling material, characterized by solidifying. 前記固化材は、セメントあるいはセメント系固化材であることを特徴とする請求項１記載の地盤埋戻し材。   2. The ground backfilling material according to claim 1, wherein the solidifying material is cement or a cement-based solidifying material. 前記微粒微粉は、前記コンクリート廃材から再生骨材を製造する際に副産される粒径５mm以下の粉粒状体であることを特徴とする請求項１記載の地盤埋戻し材。   2. The ground backfilling material according to claim 1, wherein the fine powder is a granular material having a particle size of 5 mm or less produced as a by-product when producing recycled aggregate from the concrete waste. 前記コンクリートスラッジ水は、コンクリート打設施設の洗浄排水を用いることを特徴とする請求項１に記載の地盤埋戻し材。   The ground backfilling material according to claim 1, wherein the concrete sludge water uses cleaning wastewater from a concrete placement facility. 前記スラッジ水（Ｗ）と、微粒微粉および固化材（Ｐ＋Ｃ）との質量比がＷ／（Ｐ＋Ｃ）＝０．４〜１．０であることを特徴とする請求項１に記載の地盤埋戻し材。   The ground backfill according to claim 1, wherein a mass ratio of the sludge water (W) to the fine particles and the solidified material (P + C) is W / (P + C) = 0.4 to 1.0. Wood. 前記固化材（Ｃ）と、微粒微粉および固化材（Ｐ＋Ｃ）との質量比がＣ／（Ｐ＋Ｃ）＜０．２であることを特徴とする請求項１に記載の地盤埋戻し材。   The ground backfilling material according to claim 1, wherein a mass ratio of the solidified material (C) to the fine particles and the solidified material (P + C) is C / (P + C) <0.2.
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