JP5302520B2 - Cement-based cured body and method for producing recycled fine aggregate used in the cured body - Google Patents
Cement-based cured body and method for producing recycled fine aggregate used in the cured body Download PDFInfo
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- JP5302520B2 JP5302520B2 JP2007209197A JP2007209197A JP5302520B2 JP 5302520 B2 JP5302520 B2 JP 5302520B2 JP 2007209197 A JP2007209197 A JP 2007209197A JP 2007209197 A JP2007209197 A JP 2007209197A JP 5302520 B2 JP5302520 B2 JP 5302520B2
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- 239000004568 cement Substances 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title abstract description 23
- 238000000227 grinding Methods 0.000 claims abstract description 32
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 30
- 239000002699 waste material Substances 0.000 claims abstract description 21
- 230000007547 defect Effects 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000010521 absorption reaction Methods 0.000 claims description 34
- 239000002994 raw material Substances 0.000 claims description 34
- 239000002245 particle Substances 0.000 claims description 19
- 230000002950 deficient Effects 0.000 claims description 9
- 230000003993 interaction Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 210000000988 bone and bone Anatomy 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000011282 treatment Methods 0.000 abstract description 19
- 239000000843 powder Substances 0.000 abstract description 8
- 239000006227 byproduct Substances 0.000 abstract description 5
- 238000013329 compounding Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 20
- 239000000047 product Substances 0.000 description 17
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- 240000008042 Zea mays Species 0.000 description 4
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 4
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 4
- 238000012790 confirmation Methods 0.000 description 4
- 235000005822 corn Nutrition 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 239000002440 industrial waste Substances 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 206010067482 No adverse event Diseases 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
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- 238000010298 pulverizing process Methods 0.000 description 1
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- 239000007858 starting material Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000001665 trituration Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
- Crushing And Grinding (AREA)
- Disintegrating Or Milling (AREA)
Abstract
Description
本発明は、コンクリート構造物を解体したときになどに生じるコンクリート廃材を原料として製造される粒径が５ｍｍ以下の再生細骨材を配合したセメント系硬化体、およびそのセメント系硬化体に用いる再生細骨材の製造方法に関するものである。 The present invention relates to a cement-based hardened body containing a recycled fine aggregate having a particle size of 5 mm or less, which is manufactured using a concrete waste material generated when a concrete structure is dismantled, etc., and a recycled material used for the cement-based hardened body. The present invention relates to a method for producing fine aggregates.
ビル等のコンクリート構造物を解体すると、その解体物であるコンクリート廃材（最大寸法が例えば３０〜５００ｍｍ程度のコンクリート塊）が大量に発生する。このようなコンクリート廃材は、従来、産業廃棄物として処理されるか、または再生砕石として道路用路盤材として使用されることが多かった。 When a concrete structure such as a building is dismantled, a large amount of concrete waste material (a concrete block having a maximum dimension of about 30 to 500 mm, for example) is generated. Conventionally, such concrete waste materials are often treated as industrial waste or used as roadbed material for roads as recycled crushed stone.
これに対し、産業廃棄物を減らし、有効利用することが求められ、コンクリート廃材から再生粗骨材を取り出す技術はほぼ確立されてきている（例えば、特許文献１参照）。 On the other hand, it is required to reduce and effectively use industrial waste, and a technique for extracting recycled coarse aggregate from concrete waste has been almost established (see, for example, Patent Document 1).
また、コンクリート廃材を原料とする粒径が５ｍｍ以下の高品質の再生細骨材についても、その製造と有効利用を図る研究がなされている（例えば、特許文献２参照）。 Research has also been conducted on the production and effective use of high-quality recycled fine aggregates having a particle size of 5 mm or less using concrete waste as a raw material (see, for example, Patent Document 2).
しかしながら、再生細骨材は、再生粗骨材と比べ、原細骨材（使用した元の細骨材）の表面に付着したセメント硬化物（旧付着セメントペースト）の除去が困難であるため、従来、再生細骨材はコンクリートの耐久性に悪影響すると考えられていた、あるいはそのため付着ペーストを高品質な程度まで除去することが必要とされ、その結果微粉の発生が増大するといった理由から、従来、汎用的なコンクリートへの適用例が少ないというのが実情である。 However, the recycled fine aggregate is difficult to remove the hardened cement (old cement paste) attached to the surface of the original fine aggregate (original fine aggregate used) compared to the recycled coarse aggregate. Conventionally, recycled fine aggregate has been thought to adversely affect the durability of concrete, or for that reason, it is necessary to remove the adhered paste to a high quality level, resulting in an increase in the generation of fine powder. The fact is that there are few examples of application to general-purpose concrete.
ところで、再生細骨材に関する従来の考え方は、再生細骨材（原細骨材＋旧付着セメントペースト）中の旧付着セメントペースト量が多い（吸水率が高い）と、該コンクリートの諸性能が低下する、よって、再生細骨材の品質は、得られる再生細骨材の吸水率で整理、管理できるという考え方であった。 By the way, the conventional way of thinking about recycled fine aggregate is that if the amount of old adhered cement paste in recycled fine aggregate (original fine aggregate + old adhered cement paste) is large (high water absorption), the performance of the concrete Therefore, the quality of the recycled fine aggregate was thought to be organized and managed by the water absorption rate of the obtained recycled fine aggregate.
そのため、再生細骨材を用いたコンクリートの諸性能の低下を防ぐ方法として、できるだけ旧付着セメントペースト部を除去し、吸水率を原細骨材まで下げる、いわゆる高品質化（原細骨材化）が検討されてきた。究極の例としては、加熱処理して旧付着セメントペースト部を弱体化させ除去する技術が開発されているが、コストが高くつくという欠点がある。 Therefore, as a method to prevent the deterioration of various performances of concrete using recycled fine aggregate, the old adhered cement paste part is removed as much as possible and the water absorption rate is reduced to the original fine aggregate, so-called high quality (original fine aggregate conversion) ) Has been studied. As an ultimate example, a technique for weakening and removing the old adhering cement paste part by heat treatment has been developed, but it has a drawback of high cost.
上記特許文献２の発明も、基本的には旧付着セメントペーストをできるだけ除去し、再生細骨材の吸水率を低減させることで、再生細骨材の品質向上を図るというものである。 The invention of Patent Document 2 also basically aims to improve the quality of the regenerated fine aggregate by removing the old adhering cement paste as much as possible and reducing the water absorption rate of the regenerated fine aggregate.
これに対し、本願の発明者等は、再生細骨材を用いたモルタルやコンクリートの諸性能が低下するのは、旧付着セメントペースト部に含まれる水分が新セメントペースト部に染み出る影響のほか、旧付着セメントペースト部に多く存在する凹凸部、鋭角な部分、ひびが入った部分等の欠陥部（図７、図８参照）と再生細骨材の製造時にできる原細骨材自体のひび割れ（図９参照）等の破損の影響であると考え、その確認のための実験を行った。 On the other hand, the inventors of the present application show that the various performances of mortar and concrete using recycled fine aggregates are reduced because the moisture contained in the old adhering cement paste part oozes into the new cement paste part. Defects (see Fig. 7 and Fig. 8) such as irregularities, sharp corners, cracks, etc. that are often present in the old adhering cement paste, and cracks in the original fine aggregate itself produced during the production of recycled fine aggregate (See FIG. 9).
その結果、これらの欠陥部のみを除去することで、必ずしも高品質化（原細骨材化）しなくてもモルタル強度の低下を防止できることを発見した。 As a result, it has been discovered that by removing only these defective portions, it is possible to prevent a decrease in mortar strength without necessarily improving the quality (making the raw fine aggregate).
なお、上記図７および図８は、コンクリート廃材のコンクリート塊を単に破砕し、分級して得られた５ｍｍ以下の再生細骨材の断面の顕微鏡写真である。図９は再生細骨材製造用に破砕したコンクリート破砕物をボールミルで磨砕する過程で、原細骨材にひび割れが生じていることを示す顕微鏡写真である。 7 and 8 are micrographs of cross sections of recycled fine aggregates of 5 mm or less obtained by simply crushing and classifying the concrete lump of concrete waste. FIG. 9 is a photomicrograph showing that cracks have occurred in the raw fine aggregate in the process of grinding the concrete crushed material crushed for the production of recycled fine aggregate with a ball mill.
また、再生骨材の規格としては、「コンクリート用再生骨材Ｈ」（JIS A 5021）、「再生骨材Ｍを用いたコンクリート」（JIS A 5022）、「再生骨材Ｌを用いたコンクリート」（JIS A 5023）があるが、これらは用途に応じて使い分けられるため、産業廃棄物のリサイクルの観点からは、再生細骨材の品質と用途の組合せが重要であり、そこでは経済性も考慮する必要がある。 The standard of recycled aggregate is “Recycled aggregate H for concrete” (JIS A 5021), “Concrete using recycled aggregate M” (JIS A 5022), “Concrete using recycled aggregate L”. (JIS A 5023), but since these can be used properly depending on the application, the combination of recycled fine aggregate quality and application is important from the viewpoint of recycling industrial waste. There is a need to.
本願発明は上述のような背景のもとに発明されたものであり、再生細骨材の製造時に発生する副生微粉量をできるだけ少なくするとともに、再生細骨材Ｍ並みでありながら、原細骨材や再生細骨材Ｈと同等以上の強度性能を発揮する再生細骨材を簡便に製造し、それをセメント系硬化体として有効利用できる技術を提供することを目的としている。 The present invention was invented based on the background as described above, and while minimizing the amount of by-product fine powder generated during the production of recycled fine aggregate, while maintaining the same level as that of recycled fine aggregate M, the original fine An object of the present invention is to provide a technique for easily producing a regenerated fine aggregate that exhibits strength performance equal to or greater than that of the aggregate or regenerated fine aggregate H, and effectively using it as a cement-based hardened body.
本願の請求項１に係るセメント系硬化体は、コンクリート廃材等の原コンクリートの塊を破砕して得られる原細骨材の表面にセメント硬化物が付着した粒径１０ｍｍ以下のコンクリート破砕物を、回転ドラム式磨砕機で軽度処理して、表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙やひびが残らない程度に該セメント硬化物の欠陥部のみを除去し、該欠陥部の無いセメント硬化物が付着した吸水率が再生細骨材Ｍ〜Ｌ相当でありながら再生細骨材Ｈと同等以上の強度性能を発揮する再生細骨材を用いてなることを特徴とするセメント系硬化体である。 The cement-based hardened body according to claim 1 of the present application is a concrete crushed material having a particle size of 10 mm or less in which a cement hardened material adheres to the surface of the raw fine aggregate obtained by crushing a lump of raw concrete such as concrete waste. Lightly processed with a rotary drum grinder to remove only the defective part of the hardened cement material to such an extent that unevenness, voids and cracks that become strength defects do not remain on the hardened cementitious material attached to the surface. A cement system characterized by using a regenerated fine aggregate that exhibits strength performance equal to or higher than that of the regenerated fine aggregate H while the water absorption rate to which the hardened cement is not attached is equivalent to the regenerated fine aggregates ML. It is a cured body .
ここでいう軽度処理とは、回転ドラム式磨砕機による磨砕において、投入原料のコンクリート破砕物に大きな機械的外部圧をかけず、コンクリート破砕物中の原細骨材自体はほとんど破砕や磨砕されることなく、原細骨材表面の表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙やひびが残らない程度に磨砕することをいう。 The mild treatment here refers to grinding with a rotary drum grinder, so that a large mechanical external pressure is not applied to the concrete crushed material used as input material, and the original fine aggregate itself in the crushed concrete is almost crushed or ground. This means that the hardened cement adhering to the surface of the raw fine aggregate is ground to the extent that irregularities, voids and cracks that become strength defects do not remain.
回転ドラム式磨砕機に投入するコンクリート破砕物の粒径を１０ｍｍ以下としたのは、最終的に得られる再生細骨材の粒径を、細骨材の条件である５ｍｍ以下としなければならないからである。 The reason why the particle size of the crushed concrete put into the rotary drum grinder is 10 mm or less is that the particle size of the recycled fine aggregate finally obtained must be 5 mm or less, which is the condition of the fine aggregate. It is.
１０ｍｍより大きい粒径のコンクリート破砕物から磨砕により５ｍｍ以下の再生細骨材を得ようとすると、大きな機械的外部圧が必要となり、軽度処理で磨砕における無駄が多くなり、磨砕のためのエネルギー消費が大きくなるだけでなく、副生微粉も大量に発生し、その処理が問題となる。 To obtain reclaimed fine aggregate of 5mm or less from crushed concrete with a particle size of more than 10mm by grinding, a large mechanical external pressure is required, and the use of mild processing increases waste in grinding. In addition to an increase in energy consumption, a large amount of by-product fines is generated, and the treatment becomes a problem.
回転ドラム式磨砕機に投入する原細骨材の表面にセメント硬化物が付着したコンクリート破砕物の粒径は、より好ましくは８ｍｍ以下である。８ｍｍ以下の粒径のコンクリート破砕物の場合、回転ドラム式磨砕機に大きな負担をかけることなく軽度処理により、原細骨材部分にほとんど悪影響を与えることなく、ほぼ原細骨材に付着しているセメント硬化物の最外表面の欠陥部のみを除去することができるので、効率良く目的とする再生細骨材が得られる。また、副生微粉の発生量も少なくて済む。 The particle size of the concrete crushed material in which the cement hardened material adheres to the surface of the raw fine aggregate to be put into the rotary drum type grinder is more preferably 8 mm or less. In the case of a crushed concrete with a particle size of 8 mm or less, it adheres to the original fine aggregate almost without adversely affecting the original fine aggregate part by light treatment without imposing a heavy burden on the rotating drum type grinder. Since only the defective portion on the outermost surface of the hardened cement can be removed, the desired recycled fine aggregate can be obtained efficiently. In addition, the amount of by-product fine powder generated is small.
原細骨材自体、個々の粒は、粒径も外形もさまざまであり、表面に凹凸があったり、尖った部分を有するものも含まれるが、本発明において表面の欠陥部のみ除去された再生細骨材は、顕微鏡で見ると比較的滑らかな表面を有し、かつ磨砕後に表面に残っているセメントペーストは強度発現上、欠陥の原因となる凹凸や大きな空隙やひびがほとんどないものであるため、原細骨材にかなりセメント硬化物が付着していても細骨材として原細骨材と同等またはそれ以上の性能が期待できる。 The original fine aggregate itself, each grain has a variety of particle sizes and external shapes, including those with irregularities on the surface or those with sharp parts, but in the present invention, only the surface defects are removed. The fine aggregate has a relatively smooth surface when viewed under a microscope, and the cement paste remaining on the surface after grinding has no strength and irregularities, large voids and cracks that cause defects. Therefore, even if a hardened cement material is considerably adhered to the original fine aggregate, the fine aggregate can be expected to have the same or higher performance as the original fine aggregate.
なお、粒径が１０ｍｍ以下、あるいは８ｍｍ以下のコンクリート破砕物は、例えば３０〜５００ｍｍコンクリート廃材の塊を、４０ｍｍ径以下程度に粗砕したものを、後述するようなスクリュー磨砕式処理装置で処理して得ることもできるが、必ずしもそれに限定されるものではない。従来のジョークラッシャ等の粗砕機やケージ型ミルを用いてもよい。 In addition, the concrete crushed material with a particle size of 10 mm or less, or 8 mm or less is processed by a screw grinding type processing device as described later, for example, after crushing a lump of 30-500 mm concrete waste to a diameter of about 40 mm or less. However, the present invention is not necessarily limited thereto. A conventional crusher such as a jaw crusher or a cage mill may be used.
また、通常、コンクリート廃材の塊の粗砕物は、再生細骨材の製造にのみ用いるのではなく、粒径の大きいものを再生粗骨材の製造に用い、その過程で得られる粒径の小さい破砕物を分級して再生細骨材の製造に用いることで、コンクリート廃材を無駄なく高い効率で再利用することができる。 In addition, generally, a lump of concrete waste is not used only for the production of recycled fine aggregate, but a large particle size is used for the production of recycled coarse aggregate, and the particle size obtained in the process is small. By classifying the crushed material and using it for the production of recycled fine aggregate, it is possible to reuse the waste concrete with high efficiency without waste.
前述のように、本願発明は、主に吸水率等は再生細骨材Ｍ並みでありながら、強度低下を起こし難い再生細骨材を用いたセメント系硬化体をターゲットとしており、セメント系硬化体において、再生細骨材Ｌとしての用途から再生細骨材Ｈの用途まで、幅広くカバーできる。 As described above, the present invention mainly targets a cement-based cured body using a regenerated fine aggregate that is less likely to cause a decrease in strength while having a water absorption rate or the like that of the regenerated fine aggregate M. Therefore, it is possible to cover a wide range from the use as the recycled fine aggregate L to the use of the recycled fine aggregate H.
なお、本願発明でいうセメント系硬化体とは、モルタル、コンクリートおよびこれらの二次製品であり、本願発明の再生細骨材を含むものである。細骨材中における該再生細骨材の割合は特に限定されず、天然細骨材と本願発明の再生細骨材を併用してもよい。 In addition, the cement-type hardened body as used in this invention is mortar, concrete, and these secondary products, and contains the reproduction | regeneration fine aggregate of this invention. The ratio of the regenerated fine aggregate in the fine aggregate is not particularly limited, and the natural fine aggregate and the regenerated fine aggregate of the present invention may be used in combination.
請求項１に係るセメント系硬化体においては、コンクリート廃材等の原コンクリートの塊の粗砕物をスクリュー磨砕式処理装置で処理して得られる原細骨材の表面にセメント硬化物が付着した粒径１０ｍｍ以下のコンクリート破砕物を、回転ドラム式磨砕機で軽度処理して、表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙やひびが残らない程度に該セメント硬化物の欠陥部のみを除去し、該欠陥部の無いセメント硬化物が付着した再生細骨材を用いることができる。 In cement-based cured product according to 請 Motomeko 1, cement cured product adheres to the original fine surface of the bone material obtained a crushed product of the mass of the original concrete, such as concrete waste is treated at a screw grinding砕式processor A concrete crushed material with a particle size of 10 mm or less is lightly treated with a rotary drum grinder, and the cement cured product has a defect that does not leave unevenness, voids, or cracks that become strength defects in the cement cured product attached to the surface. part only removed can Rukoto using the reproduction fine aggregate to cement cured without the defect portion is attached.
スクリュー磨砕式処理装置としては、例えば特許文献１（特許第３２００３８７号公報）に記載されたものがあり、従来、再生粗骨材の製造に利用されている。 As a screw grinding type processing apparatus, for example, there is one described in Patent Document 1 (Japanese Patent No. 3200387), which has been conventionally used for the production of recycled coarse aggregate.
上記特許文献１のスクリュー磨砕式処理装置の具体的形態としては、円筒状容器の中心に片持ち支持のスクリューフィダーが配設され、スクリューフィダーの自由端側となる上記円筒状容器の開口端に、スクリューフィダーとは逆方向に回転し、かつ円筒状容器の開口端を塞ぐ方向に弾性部材により付勢された片持ち支持のコーン状破砕体が嵌合され、スクリューフィダーによって破砕原料がコーン状破砕体に圧接されるとともに、破砕原料の圧接により生じる押圧力によりコーン状破砕体が上記弾性部材の付勢力に抗して移動し、円筒状容器の開口端とコーン状破砕体との間に破砕物の排出口が形成される構造となっている。一般的には、「太平洋ツインコーン」（商品名）と称されるものである。 As a specific form of the screw grinding type processing apparatus of Patent Document 1 , a cantilevered screw feeder is disposed at the center of the cylindrical container, and the open end of the cylindrical container serving as the free end side of the screw feeder. In addition, a cantilever cone-shaped crushed body that rotates in a direction opposite to that of the screw feeder and is urged by an elastic member in a direction to close the open end of the cylindrical container is fitted. The cone-shaped crushed body is moved against the urging force of the elastic member by the pressing force generated by the pressure contact of the crushed raw material, and is pressed between the open end of the cylindrical container and the cone-shaped crushed body. It has a structure in which an outlet for crushed material is formed. Generally, it is called “Pacific Twin Corn” (trade name).
後述する実験結果からは、回転ドラム式磨砕機に投入する原細骨材の表面にセメント硬化物が付着した粒径１０ｍｍ以下のコンクリート破砕物として、予めスクリュー磨砕式処理装置で処理したものは、ジョークラッシャだけにより破砕したものより強度発現の良いモルタルが得られることが確認されている。 From the experimental results to be described later, as a concrete crushed material having a particle size of 10 mm or less in which a hardened cement material adheres to the surface of the raw fine aggregate to be put into the rotary drum type grinder, It has been confirmed that a mortar having better strength than that crushed by only the jaw crusher can be obtained.
請求項１に係るセメント系硬化体においては、前記回転ドラム式磨砕機を、原料の投入口と排出口を有する中空のドラムをその駆動軸を中心に１００〜３００ｒｐｍの低速でトータル５〜１０分回転させ、該ドラムの駆動軸に対して偏心した回転軸を有するフリーローラーを該ドラム内で回転自在に支承し、該ドラム内でドラムとフリーローラーの相互作用に基づいて該ドラム内に投入された２００〜４００ｋｇ／ｈｒの原料を１〜２回磨砕するものであるのが好ましい。 請 In Motomeko cement hardened body according to 1, wherein the rotary drum ShikiMigaku grinder and total 5-10 in slow 100~300rpm a hollow drum around its drive shaft having an inlet and an outlet of the material A free roller having a rotation shaft that is rotated by a minute amount and is eccentric with respect to the drive shaft of the drum is rotatably supported in the drum, and is inserted into the drum based on the interaction between the drum and the free roller in the drum. been it is preferred that the starting materials 1-2 times trituration 200~400kg / hr.
このような回転ドラム式磨砕機としては、例えば特許文献２（特開２００６−０１６２７４号公報）、特許文献３（特許第２５４８６８１号公報）に記載されたものがある。 Examples of such a rotating drum type grinder include those described in Patent Document 2 (Japanese Patent Laid-Open No. 2006-016274) and Patent Document 3 (Japanese Patent No. 2554881).
上記特許文献２、３の回転ドラム式磨砕機の具体的形態としては、原料の投入口と排出口を有する中空のドラムをその駆動軸を中心に回転させ、該ドラムの駆動軸に対して偏心した回転軸を有するフリーローラーを該ドラム内で回転自在に支承し、該ドラム内でドラムとフリーローラーの相互作用に基づいて該ドラム内に投入された原料を磨砕する構造となっている。 As a specific form of the rotary drum type grinder of Patent Documents 2 and 3, a hollow drum having a raw material inlet and outlet is rotated around its drive shaft, and is eccentric with respect to the drum drive shaft. The free roller having the rotating shaft is rotatably supported in the drum, and the raw material charged in the drum is ground in the drum based on the interaction between the drum and the free roller.
フリーローラーは、それ自体は駆動軸を有しない形で上述のようにドラム内で所定距離だけ偏心して配置されており、フリーローラーの回転軸は、軸受によって回転自在に支持されている。一般的には、回転軸の外側に、ベヤリングケースがベヤリングを介して自由回転可能に設けられ、ベヤリングケースにフリーローラー本体が着脱可能に取り付けられる。フリーローラー本体は耐磨耗性の材料で形成されており、外周が二重構造になっている。フリーローラー本体の周端面には、耐磨耗対策としてセラミックス製の部材が設けられている。 As described above, the free roller is eccentrically arranged by a predetermined distance in the drum without having a drive shaft, and the rotation shaft of the free roller is rotatably supported by a bearing. Generally, a bearing case is provided on the outer side of the rotating shaft so as to be freely rotatable via the bearing, and a free roller body is detachably attached to the bearing case. The free roller body is made of a wear-resistant material and has a double outer periphery. A ceramic member is provided on the peripheral end surface of the free roller body as a wear-resistant measure.
フリーローラーは、ドラムの下部の層に侵入して回転し、原料を磨砕する。軽度処理を行う上で重要なのが、ドラムの回転数と隙間（ドラムの底部とフリーローラー端面との距離）と原料投入量である。 The free roller penetrates into the lower layer of the drum and rotates to grind the raw material. What is important in performing light processing is the number of revolutions of the drum, the gap (distance between the bottom of the drum and the end face of the free roller), and the amount of raw material input.
投入する粒径１０ｍｍ以下のコンクリート破砕物の個々の品質や粒度分布によっても影響を受けるが、軽度処理としては、ドラムを１００〜３００ｒｐｍ程度の低速で回転させる操作を、トータル５〜１０分程度行う。 Although it is affected by the quality and particle size distribution of the concrete crushed material having a particle size of 10 mm or less to be added, as a mild treatment, the operation of rotating the drum at a low speed of about 100 to 300 rpm is performed for a total of about 5 to 10 minutes. .
該操作は複数回に分けて行ってもよい。この時の隙間は原料投入量にもよるが、１０〜１８ｍｍが好ましい。原料投入量は、ドラムの空間容積が約６０００ｃｍ3の場合、１５ｋｇ程度である。 The operation may be performed in a plurality of times. The gap at this time is preferably 10 to 18 mm, although it depends on the amount of raw material input. The raw material input amount is about 15 kg when the space volume of the drum is about 6000 cm 3 .
このような軽度処理を行うことによって、コンクリート破砕物中の原細骨材自体はほとんど破砕や磨砕されることなく、原細骨材表面の原細骨材の表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙やひびのみをこれらが残らない程度に磨砕することができる。 By carrying out such a light treatment, the raw fine aggregate itself in the concrete crushed material is hardly crushed or ground, and the cement hardened material adhering to the surface of the raw fine aggregate on the surface of the raw fine aggregate is made. It is possible to grind only irregularities, voids, and cracks that become a strength defect to such an extent that they do not remain.
顕微鏡観察を行うと、得られる再生細骨材の原細骨材部分にはほとんどひび割れ等の悪影響がなく、付着しているセメント硬化物における表面の欠陥部（大きな凹凸や空隙やひび）のみが除去され、比較的平滑なセメント硬化物層が付着しており、外形は丸みをおびていることが分かる。 Doing microscopic observation, no adverse effects such little to the original fine aggregate portion of the resulting reproducing fine aggregate crack, only defect of the surface of hardened cement product adhering (large and voids Yahibi) is It can be seen that a relatively smooth cement hardened material layer is removed and the outer shape is rounded.
請求項１に係るセメント系硬化体においては、前記再生細骨材が、原細骨材の表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙やひびが残らない程度に磨砕されたものであり、該再生細骨材の吸水率が４〜１０％であるのが好ましい。 In the cement-based hardened body according to claim 1 , the recycled fine aggregate is ground to such an extent that unevenness, voids and cracks that become a strength defect do not remain in the hardened cement adhering to the surface of the original fine aggregate. It is preferable that the recycled fine aggregate has a water absorption of 4 to 10%.
発明が解決しようとする課題の項で述べたように、再生細骨材に関する従来の考え方は、再生細骨材の性能は、吸水率で整理、管理できるという考え方であり、従来は高品質の再生細骨材を得るべく吸水率３％以下とするべきであるとされていた。 As described in the section of the problem to be solved by the invention, the conventional idea regarding recycled fine aggregate is that the performance of recycled fine aggregate can be organized and managed by the water absorption rate. It was said that the water absorption should be 3% or less in order to obtain recycled fine aggregate.
しかしながら、本願発明によれば、後述する実験結果から明らかなように、再生細骨材の吸水率が４〜１０％と高く、原細骨材の表面にまだかなりセメント硬化物が付着している再生細骨材Ｍ〜Ｌ相当のものでも、該セメント硬化物の外表面における強度的欠陥や凹凸のみを除去し、原細骨材自体に損傷を与えない軽度処理したものであれば、実用的に十分な強度が得られることが確認された。 However, according to the present invention, as apparent from the experimental results described later, the recycled fine aggregate has a high water absorption rate of 4 to 10%, and the cemented hardened material is still adhered to the surface of the original fine aggregate. Recycled fine aggregates M to L are also practical if they are mildly treated so that only the strength defects and irregularities on the outer surface of the hardened cement are removed and the original fine aggregate itself is not damaged. It was confirmed that sufficient strength was obtained.
本願発明でいう「強度的欠陥となる凹凸や空隙やひびが残らない程度」とは、例えば５ｍｍの再生細骨材を顕微鏡（倍率１０倍）で観察して、表面に図７や図８に示すような大きな凹凸や空隙やひびがなく、ほぼ滑らかに見える程度である。 In the present invention, “the extent to which unevenness, voids, and cracks that become a strength defect do not remain” means that, for example, a regenerated fine aggregate of 5 mm is observed with a microscope (magnification 10 times), and the surface is shown in FIGS. no large and voids Yahibi shown is the degree to which appear almost smooth.
本願発明のセメント系硬化体における再生細骨材は、JIS A 5022-2007の付属書Ａに規定される再生細骨材Ｍとして使用することも可能である。 Cementitious reproducing fine aggregate in the cured product of the present invention can also be used as a reproducing fine aggregate M defined in Annex A of JIS A 5022-2007.
本願発明に係る再生細骨材を用いたセメント系硬化体は、十分な強度を有するものであるが、再生細骨材自体は必ずしも全てがJISに合致するものではないが、吸水率については再生細骨材Ｍ〜Ｌに相当する。一方、JIS A 5022-2007の付属書Ａにおける再生細骨材Ｍの吸水率は７．０％以下と規定されている。従って、吸水率を７．０％以下とするなど、JIS A 5022-2007の付属書Ａの規定に合致するものとすれば、本発明のセメント系硬化体が、そのまま再生細骨材Ｍを用いたコンクリートとしてのJIS A 5022-2007の規定を満たすものとなるので、使いやすくなる。 The cement-based hardened body using the recycled fine aggregate according to the present invention has sufficient strength, but the recycled fine aggregate itself does not necessarily conform to JIS, but the water absorption rate is recycled. It corresponds to fine aggregates ML. On the other hand, the water absorption rate of recycled fine aggregate M in Appendix A of JIS A 5022-2007 is specified to be 7.0% or less. Therefore, if the water absorption rate is 7.0% or less, etc., the cemented hardened body of the present invention uses the recycled fine aggregate M as it is if it conforms to the provisions of Appendix A of JIS A 5022-2007. As it meets the requirements of JIS A 5022-2007 as concrete, it is easy to use.
本願の請求項２に係るセメント系硬化体は、前記再生細骨材は、吸水率が４〜１０％で、かつJIS R 5201によるモルタルの圧縮強度試験で４５Ｎ／ｍｍ２以上の圧縮強度を有するものであることを特徴とする請求項１記載のセメント系硬化体である。 Cement cured body according to claim 2 of the present application, the reproduction fine aggregate is a water absorption of 4% to 10%, and has a 45N / mm 2 or more compression strength in compression strength test of mortar according to JIS R 5201 It is a thing, It is a cement-type hardened | cured material of Claim 1 .
後述する実験結果から明らかなように、本発明のコンクリート破砕物を回転ドラム式磨砕機により軽度処理して得られる再生細骨材を用いたモルタルの強度は、ボールミルで磨砕した再生細骨材を用いたモルタルに比べ高く、４５Ｎ／ｍｍ2以上の圧縮強度が得られることが確認できた。 As is clear from the experimental results to be described later, the strength of the mortar using the regenerated fine aggregate obtained by lightly treating the crushed concrete of the present invention with a rotary drum type grinder is regenerated fine aggregate ground by a ball mill. It was confirmed that a compressive strength of 45 N / mm 2 or higher was obtained, which is higher than that of mortar using the slag.
ここに示す強度発現の良い再生細骨材は、請求項１に示すように、表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙が残らない程度に該セメント硬化物の欠陥部のみを除去すれば得られる。 As shown in claim 1, the recycled fine aggregate having good strength expression shown here is only a defective part of the cement hardened material to such an extent that unevenness and voids that become strength defects do not remain on the hardened cemented material adhering to the surface. Can be obtained by removing .
本願発明のセメント系硬化体における再生細骨材は、コンクリート廃材等の原コンクリートの塊の粗砕物を、まずスクリュー磨砕式処理装置で処理し、該処理で得られた原細骨材表面にセメント硬化物が付着した粒径１０ｍｍ以下のコンクリート破砕物を、さらに回転ドラム式磨砕機で表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙やひびが残らない程度に軽度処理することによっても得ることができる。 The recycled fine aggregate in the cement-based hardened body of the present invention is obtained by first treating a coarse crushed material of raw concrete such as concrete waste with a screw-grinding processing device, and then on the surface of the raw fine aggregate obtained by the treatment. Treat concrete crushed material with a particle size of 10 mm or less with hardened cement to a slight extent so that unevenness, voids and cracks that become strength defects do not remain on the hardened cement that has adhered to the surface with a rotary drum grinder. Can also be obtained .
これは、本願発明のセメント系硬化体に用いるのに好適な再生細骨材の製造方法であり、スクリュー磨砕式処理装置と回転ドラム式磨砕機の併用によるものである。 This is a manufacturing how suitable reproduction fine aggregate for use in cementitious cured product of the present invention is due to the combination of the screw grinding砕式processor rotary drum ShikiMigaku mill.
このような併用を行うことにより、回転ドラム式磨砕機だけの処理より、再生細骨材の吸水率の低減を図ることなく、セメント系硬化体の強度を高くでき、吸水率４〜７％の範囲でも材令２８日での圧縮強度が４５Ｎ／ｍｍ2以上となるJISモルタルが容易に得られる。 By using such a combination, the strength of the cement-based hardened body can be increased without reducing the water absorption rate of the regenerated fine aggregate, compared with the treatment using only the rotary drum grinder, and the water absorption rate is 4 to 7%. Even in the range, JIS mortar having a compressive strength of 45 N / mm 2 or more at 28 days of material age can be easily obtained.
理由は定かではないが、スクリュー磨砕式処理装置での処理による応力歪が、後の回転ドラム式磨砕機での前記欠陥部分の剥離を容易にしていると見られる。 The reason is not clear, but it seems that the stress strain caused by the treatment in the screw grinding type processing device facilitates the separation of the defective portion in the subsequent rotary drum type grinding machine.
前記スクリュー磨砕式処理装置と回転ドラム式磨砕機の併用による再生細骨材の製造方法において、前記スクリュー磨砕式処理装置は、円筒状容器の中心に片持ち支持のスクリューフィダーが配設され、該スクリューフィダーの自由端側となる上記円筒状容器の開口端に、前記スクリューフィダーとは逆方向に回転し、かつ上記円筒状容器の開口端を塞ぐ方向に弾性部材により付勢された片持ち支持のコーン状破砕体が嵌合され、前記スクリューフィダーによって破砕原料が前記コーン状破砕体に圧接されるとともに、該破砕原料の圧接により生じる押圧力によりコーン状破砕体が上記弾性部材の付勢力に抗して移動し、円筒状容器の開口端とコーン状破砕体との間に破砕物の排出口が形成される構造の装置である。 In the method for producing recycled fine aggregate using the screw grinding type processing apparatus and the rotary drum type grinding machine, the screw grinding type processing apparatus is provided with a cantilevered screw feeder at the center of a cylindrical container. A piece rotated at the opening end of the cylindrical container on the free end side of the screw feeder in a direction opposite to the screw feeder and biased by an elastic member in a direction to close the opening end of the cylindrical container A cone-shaped crushed body is supported, and the crushed material is pressed against the corn-shaped crushed body by the screw feeder, and the crushed material is attached to the elastic member by the pressing force generated by the pressure contact of the crushed material. moves against the force, Ru apparatus der structure outlet of the crushed material is formed between the open end and the cone-shaped crushing of the cylindrical container.
このようなスクリュー磨砕式処理装置としては、請求項２に関して説明したように、例えば特許文献１（特許第３２００３８７号公報）に記載されたものを用いることができる。市販のものとして、「太平洋ツインコーン」（商品名）があるので、これを用いればよい。 As such a screw grinding type processing apparatus, as described in claim 2, for example, the one described in Patent Document 1 (Japanese Patent No. 3300237) can be used. As a commercially available product, there is “Pacific Twin Corn” (trade name), which can be used.
本願の請求項３に係るセメント硬化体は、前述のことから、前記回転ドラム式磨砕機が、原料の投入口と排出口を有する中空のドラムをその駆動軸を中心に１００〜３００ｒｐｍの低速でトータル５〜１０分回転させ、該ドラムの駆動軸に対して偏心した回転軸を有するフリーローラーを該ドラム内で回転自在に支承し、該ドラム内でドラムとフリーローラーの相互作用に基づいて該ドラム内に投入された２００〜４００ｋｇ／ｈｒの原料を１〜２回磨砕するものであることを特徴とする請求項１または２記載のセメント系硬化体である。 In the cement hardened body according to claim 3 of the present application, the rotating drum type grinder has a hollow drum having a raw material inlet and an outlet at a low speed of 100 to 300 rpm around its drive shaft. A free roller having a rotation shaft that is rotated for a total of 5 to 10 minutes and is eccentric with respect to the drive shaft of the drum is rotatably supported in the drum, and the free roller in the drum is based on the interaction between the drum and the free roller. it is a cement-based cured product according to claim 1 or 2, wherein the raw material of the entered 200~400kg / hr is for once or twice triturated in the drum.
このような回転ドラム式磨砕機としては、請求項３に関して説明したように、例えば特許文献２（特開２００６−０１６２７４号公報）、特許文献３（特許第２５４８６８１号公報）に記載されたものを用いることができる。市販のものとしては、「ＫＭポリッシャー」（商品名）がある。 As such a rotating drum type grinder, as described in regard to claim 3, for example, those described in Patent Document 2 (Japanese Patent Laid-Open No. 2006-016274) and Patent Document 3 (Japanese Patent No. 2554881) are used. Can be used. A commercially available product is “KM Polisher” (trade name).
本発明のセメント系硬化体は、コンクリート廃材等の原コンクリートの塊を破砕して得られる原細骨材の表面にセメント硬化物が付着した粒径１０ｍｍ以下のコンクリート破砕物を、回転ドラム式磨砕機で軽度処理して得られる再生細骨材を用いてなるものであり、回転ドラム式磨砕機の軽度処理によって得られる再生細骨材は原細骨材部分にほとんど悪影響を与えることなく、ほぼ付着しているセメント硬化物の最外表面の欠陥部のみを除去したものであり、顕微鏡で見ると、付着しているセメント硬化物は比較的滑らかな表面を有している。 The cement-based hardened body of the present invention is a rotary drum-type polished crushed concrete having a particle size of 10 mm or less in which cement hardened material adheres to the surface of the raw fine aggregate obtained by crushing a lump of raw concrete such as concrete waste. Recycled fine aggregate obtained by mild processing with a crusher is used, and the recycled fine aggregate obtained by mild processing of a rotary drum type grinder almost does not adversely affect the original fine aggregate part, Only the defective portion on the outermost surface of the adhered cement cured product is removed. When viewed with a microscope, the adhered cement cured product has a relatively smooth surface.
このように原細骨材にまだかなりセメント硬化物が付着している吸水率が再生細骨材Ｍ〜Ｌ相当の再生細骨材でも、顕微鏡で見た場合、付着しているセメント硬化物に強度的欠陥となる凹凸や空隙やひびのない滑らかな表面を有しているものであれば、モルタルあるいはコンクリートなどのセメント系硬化体に利用することで、再生細骨材Ｈや原細骨材を用いた場合と同等またはそれ以上の強度が期待できる。 In this way, even if the recycled fine aggregate has a water absorption rate equivalent to the recycled fine aggregates ML, the cement cured product still adheres to the original fine aggregate. as long as it has a smooth surface without irregularities or voids Yahibi as a strength defects, the use in cement-based hardening material, such as mortar or concrete, reproducing fine aggregate H or raw fine aggregate It can be expected to have a strength equal to or higher than that of using.
また、本発明においては、回転ドラム式磨砕機の負担も小さく、少ないエネルギーで再生細骨材を無駄なく、経済的に効率良く製造することができ、産業廃棄物のリサイクルの目的からも効果が大きい。 Further, in the present invention, the burden of the rotating drum type grinder is small, the recycled fine aggregate can be produced economically and efficiently with less energy, and is also effective for the purpose of recycling industrial waste. large.
また、該磨砕機では軽度処理を行うので、該磨砕機から発生する副生微粉の発生量は少なくて済む。 Further, since the grinding machine performs a light treatment, the amount of by-product fines generated from the grinding machine can be reduced.
図１は、本発明で使用することができる回転ドラム式磨砕機の一例を示したものである（特許文献２参照）。 FIG. 1 shows an example of a rotary drum grinder that can be used in the present invention (see Patent Document 2).
この回転ドラム式磨砕機は、原料の投入口１５と排出口１６を有する中空のドラム１をその駆動軸５を中心に回転させ、ドラム１の駆動軸５に対して偏心した回転軸８を有するフリーローラー２をドラム１内で回転自在に支承し、ドラム１内でドラム１とフリーローラー２の相互作用に基づいてドラム１内に投入された原料を磨砕する構造となっている。 This rotary drum type grinder has a rotary shaft 8 that is eccentric with respect to the drive shaft 5 of the drum 1 by rotating a hollow drum 1 having a raw material inlet 15 and a discharge port 16 about its drive shaft 5. The free roller 2 is rotatably supported in the drum 1, and the raw material charged in the drum 1 is ground in the drum 1 based on the interaction between the drum 1 and the free roller 2.
図２は、本発明で使用することができるスクリュー磨砕式処理装置の一例を示したものであり、従来、再生粗骨材の製造に利用されている（特許文献１参照）。 FIG. 2 shows an example of a screw grinding type processing apparatus that can be used in the present invention, which has been conventionally used for the production of recycled coarse aggregate (see Patent Document 1).
このスクリュー磨砕式処理装置３１は、円筒状容器３２の中心に片持ち支持のスクリューフィダー３３が配設され、スクリューフィダー３３の自由端側となる上記円筒状容器３２の開口端に、スクリューフィダー３３とは逆方向に回転し、かつ円筒状容器３２の開口端を塞ぐ方向に弾性部材４７により付勢された片持ち支持のコーン状破砕体３４が嵌合され、スクリューフィダー３３によって破砕原料がコーン状破砕体３４に圧接されるとともに、破砕原料の圧接により生じる押圧力によりコーン状破砕体３４が上記弾性部材４７の付勢力に抗して移動し、円筒状容器３２の開口端とコーン状破砕体３４との間に破砕物の排出口３７が形成される構造となっている。 In the screw grinding type processing device 31, a cantilever-supported screw feeder 33 is disposed at the center of a cylindrical container 32, and a screw feeder is provided at the opening end of the cylindrical container 32 that is the free end side of the screw feeder 33. Rotating in a direction opposite to that of the cylindrical container 32, a cantilevered cone-shaped crushed body 34 biased by an elastic member 47 is fitted in a direction to close the open end of the cylindrical container 32, and the crushing raw material is crushed by the screw feeder 33. While being pressed against the corn crush body 34, the corn crush body 34 is moved against the urging force of the elastic member 47 due to the pressing force generated by the pressure contact of the crushing raw material, and the open end of the cylindrical container 32 and the cone shape. A crushing material discharge port 37 is formed between the crushing body 34 and the crushing body 34.
本発明で用いる再生細骨材の好ましい製造手順は、以下の通りである。 A preferable production procedure of the regenerated fine aggregate used in the present invention is as follows.
まず、最大寸法が例えば３０〜５００ｍｍ程度のコンクリート塊として搬入されてきたコンクリート廃材を、４０ｍｍ径以下に粗砕し、図２のスクリュー磨砕式処理装置に投入し、磨砕したものについて、８ｍｍふるい通過分を取り出す。８ｍｍふるいに残ったコンクリート廃材は、再生粗骨材の製造に利用することができる。なお、必要に応じスクリュー磨砕式処理装置による磨砕を２回以上繰り返してもよい。 First, the concrete waste material carried in as a concrete lump having a maximum dimension of about 30 to 500 mm, for example, is roughly crushed to a diameter of 40 mm or less, put into the screw grinding type processing apparatus of FIG. Take out the passage through the sieve. The concrete waste remaining in the 8 mm sieve can be used for the production of recycled coarse aggregate. In addition, you may repeat the grinding | pulverization by a screw grinding type processing apparatus twice or more as needed.
８ｍｍふるい通過したものについて、微粉を除去し、図１の回転ドラム式磨砕機に投入する。回転ドラム式磨砕機は、軽度処理のため、ドラムを１００〜３００ｒｐｍ程度の低速で回転させる操作を、トータルで５〜１０分程度行う。必要に応じ回転ドラム式磨砕機による磨砕を２回以上繰り返してもよい。隙間は１０〜１８ｍｍとする。市販のＫＭポリッシャー（商品名）を用いる場合は、原料投入量を２００〜４００ｋｇ／ｈｒとする。 About what passed 8 mm sieve, fine powder is removed and it introduce | transduces into the rotating drum type grinder of FIG. The rotating drum type grinder performs the operation of rotating the drum at a low speed of about 100 to 300 rpm for a total of about 5 to 10 minutes for light processing. If necessary, grinding with a rotary drum grinder may be repeated two or more times. The gap is 10 to 18 mm. When a commercially available KM polisher (trade name) is used, the raw material input amount is set to 200 to 400 kg / hr.
このような回転ドラム式磨砕機による軽度処理により、コンクリート破砕物中の原細骨材自体はほとんど破砕や磨砕により損傷を受けることなく、原細骨材表面の原細骨材の表面に付着したセメント硬化物に強度的欠陥となる凹凸や空隙やひびが残らない程度に磨砕し、付着したセメント硬化物外表面における欠陥部のみを除去することができる。 By the mild treatment by the rotating drum type grinder, the original fine aggregate itself in the concrete crushed material is hardly damaged by crushing and grinding, and adheres to the surface of the raw fine aggregate on the surface of the original fine aggregate. The hardened cement can be ground to such an extent that unevenness, voids and cracks that become strength defects do not remain, and only the defective portion on the outer surface of the hardened cement can be removed.
上述のようにして得られた再生細骨材を、一般のモルタルあるいはコンクリートなどにおける細骨材と同様に配合することで、原細骨材を配合した場合とほぼ同等または同等以上の強度発現を示すセメント系硬化体を得ることができる。 By blending the regenerated fine aggregate obtained as described above in the same way as fine aggregate in general mortar or concrete, the strength expression is almost equal to or equal to or greater than that of the original fine aggregate. The cement-based cured body shown can be obtained.
本発明の効果を確認するために以下の実験を行なった。 In order to confirm the effect of the present invention, the following experiment was conducted.
〔実験概要〕
原コンクリートをジョークラッシャで４０ｍｍ以下に破砕し、５ｍｍふるい通過分から微粉を除去した再生細骨材を原料Ａとした。また、続けて４０〜５ｍｍをスクリュー磨砕法（図１のスクリュー磨砕式処理装置、太平洋エンジニアリング株式会社製、太平洋ツインコーンを使用）で処理して再生粗骨材を製造し、８ｍｍふるい通過分から微粉を除去した再生細骨材を原料Ｂとした。
[Experiment Overview]
Recycled fine aggregate obtained by crushing raw concrete to 40 mm or less with a jaw crusher and removing fine powder from the passage of 5 mm sieve was used as raw material A. Further, 40 to 5 mm is continuously processed by a screw grinding method (screw grinding type processing apparatus of FIG. 1, manufactured by Taiheiyo Engineering Co., Ltd., using Taiheiyo Twin Cone) to produce a recycled coarse aggregate. Recycled fine aggregate from which fine powder was removed was used as raw material B.
次いで小型のジョークラッシャ、ボールミル、または磨砕機（図２の回転ドラム式磨砕機、関西マテック株式会社製、ＫＭポリッシャ）を用いて、原料Ａおよび原料Ｂから１２種類の再生細骨材を試製した。試製した再生細骨材の物性を表１に示す。 Next, 12 kinds of recycled fine aggregates were trial manufactured from the raw material A and the raw material B using a small jaw crusher, ball mill, or grinding machine (rotary drum type grinding machine of FIG. 2, manufactured by Kansai Matec Co., Ltd., KM Polisher). . Table 1 shows the physical properties of the trial recycled fine aggregate.
試験モルタルは、普通セメント１、細骨材３、水０．５０の割合で混練し、フローおよび圧縮強度の測定方法は、JIS R 5021に準じた。また、実験には比較用として普通細骨材（原細骨材）を加えた。 The test mortar was kneaded at a ratio of ordinary cement 1, fine aggregate 3 and water 0.50, and the flow and compressive strength measurement methods were in accordance with JIS R 5021. In the experiment, ordinary fine aggregate (original fine aggregate) was added for comparison.
〔実験結果〕
(1) 再生細骨材を用いたモルタルのフロー
原料Ａから試製した再生細骨材モルタルのフローを表１および図３に示す。原料Ａのモルタルフローは１５８ｍｍであり、原骨材より４７ｍｍ小さかった。ボールミルおよび磨砕機で試製すると、その処理回数が増える度にフローが増大し、原骨材のフロー値に近づいたのに対し、ジョークラッシャで試製した場合にはフローの増大はわずかであった。
〔Experimental result〕
(1) Mortar Flow Using Recycled Fine Aggregate The flow of the regenerated fine aggregate mortar made from the raw material A is shown in Table 1 and FIG. The mortar flow of the raw material A was 158 mm, 47 mm smaller than the raw aggregate. When trial production was performed with a ball mill and a grinder, the flow increased as the number of treatments increased, and the flow value approached that of the raw aggregate, whereas when trial production was performed with a jaw crusher, the increase in flow was slight.
一方、原料Ｂのフローは、表１に示したとおり２０２ｍｍで原骨材と同等であり、ボールミルおよび磨砕機で処理してもフローの変化は小さかった。 On the other hand, the flow of the raw material B was 202 mm as shown in Table 1, which was the same as that of the raw aggregate, and the change in the flow was small even when treated with a ball mill and a grinder.
再生細骨材の実積率とモルタルフローの関係を図４に示す。図４より、原料Ａから試製した再生細骨材のように実積率が概ね６８％以下の場合は実積率とフローは直線関係で表せるのに対し、原料Ｂから試製した再生細骨材のように実積率が７０％以上では、フローの変化は小さかった。 FIG. 4 shows the relationship between the actual volume ratio of recycled fine aggregate and the mortar flow. As shown in FIG. 4, when the actual volume ratio is approximately 68% or less as in the regenerated fine aggregate produced from the raw material A, the actual volume ratio and the flow can be expressed in a linear relationship, whereas the regenerated fine aggregate produced from the raw material B as a trial. As shown, the change in the flow was small when the actual volume ratio was 70% or more.
(2) 再生細骨材の吸水率とモルタルの圧縮強度
再生細骨材の吸水率とモルタルの圧縮強度は表１に示したとおりである。吸水率は原骨材を除きほぼ４〜７％の範囲にある。ジョークラッシャやボールミルでは、処理回数を増やすと吸水率は低下するが、磨砕機では必ずしも低下しない。
(2) Water absorption of regenerated fine aggregate and compressive strength of mortar Table 1 shows the water absorption of regenerated fine aggregate and compressive strength of mortar. The water absorption is in the range of approximately 4-7% except for the raw aggregate. In the jaw crusher and the ball mill, the water absorption decreases when the number of treatments is increased, but in the grinder, it does not necessarily decrease.
原料Ａから試製した再生細骨材の吸水率とそれを用いたモルタルの圧縮強度の関係を図５に示す。ジョークラッシャでは処理回数を増やして骨材の吸水率を低減しても、圧縮強度の改善効果は認められなかった。 FIG. 5 shows the relationship between the water absorption rate of the regenerated fine aggregate produced from the raw material A and the compressive strength of the mortar using the recycled fine aggregate. In the jaw crusher, even if the number of treatments was increased and the water absorption rate of the aggregate was reduced, the compression strength was not improved.
ボールミルを用いた場合、骨材の吸水率はジョークラッシャと同様の傾向を示し、同程度であるが、圧縮強度が約３Ｎ／ｍｍ2大きかった。ボールミルでも処理回数を増やして骨材の吸水率を低減しても、圧縮強度の改善効果は見られなかった。 When the ball mill was used, the water absorption rate of the aggregate showed the same tendency as that of the jaw crusher, which was similar, but the compressive strength was about 3 N / mm 2 larger. Even in the ball mill, even if the number of treatments was increased and the water absorption rate of the aggregate was reduced, the effect of improving the compressive strength was not seen.
一方、磨砕機を用いた場合は、処理回数を２回にする（トータル７分）と、圧縮強度の改善効果が顕著であり、吸水率が５％程度あるにもかかわらず、モルタル強度を比較すると、ジョークラッシャより８Ｎ／ｍｍ2、ボールミルより５Ｎ／ｍｍ2大きく、原骨材と同等であった。 On the other hand, when the grinder is used, if the number of treatments is set to 2 (total 7 minutes), the effect of improving the compressive strength is remarkable, and the mortar strength is compared even though the water absorption is about 5%. Then, 8N / mm 2 than jaw crusher, 5N / mm 2 larger than a ball mill, was comparable to the original bone material.
また、原料Ｂから試製した再生細骨材の吸水率とモルタル強度の関係を図６に示す。図６より、ボールミルで処理した骨材の吸水率は低下し、原料Ｂより強度が４Ｎ／ｍｍ2改善した。一方、磨砕機で製造した場合は、処理回数１回でも強度が著しく改善され、処理回数２回では原料Ｂより１２Ｎ／ｍｍ2、原骨材より５Ｎ／ｍｍ2大きい結果となった。 Moreover, the relationship between the water absorption rate and the mortar strength of the regenerated fine aggregate produced from the raw material B is shown in FIG. From FIG. 6, the water absorption of the aggregate treated with the ball mill decreased, and the strength was improved by 4 N / mm 2 from that of the raw material B. On the other hand, when it was manufactured by a grinder, the strength was remarkably improved even after one treatment, and the result was 12 N / mm 2 greater than that of the raw material B and 5 N / mm 2 greater than that of the raw aggregate.
以上のことから、強度的観点に限ってみれば、必ずしも従来のように高品質の再生細骨材の製造を目指す必要はなく、特定の製造条件で製造すれば、吸水率が４〜７％程度の中品質のものでも、高品質のものと遜色ないものが得られることが分かった。 From the above, from the viewpoint of strength, it is not always necessary to aim for the production of high-quality recycled fine aggregate as in the past, and if manufactured under specific production conditions, the water absorption is 4-7%. It was found that even medium-quality products can be obtained that are comparable to high-quality products.
(3) まとめ
上記の実験において、モルタルの流動性および圧縮強度を比較した結果、以下のことが明らかとなった。
(3) Summary As a result of comparing the fluidity and compressive strength of the mortar in the above experiment, the following became clear.
(a) モルタルの流動性は、再生細骨材の実積率が６８％以下の場合は実積率とフローが直線関係で表せるのに対し、実積率が７０％以上では、フローの変化は小さかった。 (a) The flow rate of mortar can be expressed in a linear relationship between the actual volume ratio and the flow when the actual volume ratio of recycled fine aggregate is 68% or less, while the flow rate changes when the actual volume ratio is 70% or more. Was small.
(b) 骨材の吸水率が同程度であっても、骨材の製造方法によって、モルタル強度は異なり、吸水率が低い方が強度が高くなることは一概には言えない。磨砕機を用いれば、吸水率が５％程度の再生細骨材でも、原骨材（普通細骨材）と同等またはそれ以上の圧縮強度を得られた。 (b) Even if the water absorption rate of the aggregate is about the same, the mortar strength differs depending on the method of manufacturing the aggregate, and it cannot be generally said that the lower the water absorption rate, the higher the strength. Using a grinder, even a recycled fine aggregate having a water absorption rate of about 5% could obtain a compressive strength equal to or higher than that of the original aggregate (ordinary fine aggregate).
１…ドラム、２…フリーローラー、３，９…端壁、４，７…軸受、５…駆動軸、６…プーリ、８…回転軸、１０…リング状板、１１…投入シュート、１２…カバー、１３…排出シュート、１４ａ，１４ｂ…層、１５…投入口、１６…排出口、１７…側壁、１８…排出通路、
２１…スクリュー磨砕式処理装置、３１…傾斜した基台、３２…円筒状容器、３３…スクリューフィダー、３４…コーン状破砕体、３６…原料投入口、３７…破砕物排出口、３８…回転軸、３９…扇形破砕刃、４０…角状破砕刃、４１…軸受、４２…モーター、４３…摺動台、４４…軸受、４５…回転軸、４６…モーター、４７…弾性部材、４８…ハンドル
DESCRIPTION OF SYMBOLS 1 ... Drum, 2 ... Free roller, 3, 9 ... End wall, 4, 7 ... Bearing, 5 ... Drive shaft, 6 ... Pulley, 8 ... Rotating shaft, 10 ... Ring-shaped plate, 11 ... Thing chute, 12 ... Cover , 13 ... discharge chute, 14a, 14b ... layer, 15 ... inlet, 16 ... outlet, 17 ... side wall, 18 ... outlet passage,
DESCRIPTION OF SYMBOLS 21 ... Screw grinding type processing apparatus, 31 ... Inclined base, 32 ... Cylindrical container, 33 ... Screw feeder, 34 ... Cone-shaped crush body, 36 ... Raw material inlet, 37 ... Crushed material discharge port, 38 ... Rotation Shaft 39: Fan-shaped crushing blade 40: Square crushing blade 41 ... Bearing 42 ... Motor 43 ... Slide base 44 ... Bearing 45 ... Rotating shaft 46 ... Motor 47 ... Elastic member 48 ... Handle
Claims (3)
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| JP2007209197A JP5302520B2 (en) | 2007-08-10 | 2007-08-10 | Cement-based cured body and method for producing recycled fine aggregate used in the cured body |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2007209197A JP5302520B2 (en) | 2007-08-10 | 2007-08-10 | Cement-based cured body and method for producing recycled fine aggregate used in the cured body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2009040655A JP2009040655A (en) | 2009-02-26 |
| JP5302520B2 true JP5302520B2 (en) | 2013-10-02 |
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| JP2010001189A (en) * | 2008-06-20 | 2010-01-07 | Eg Modern Works Kk | Cement secondary product |
| JP5283574B2 (en) * | 2009-06-09 | 2013-09-04 | 株式会社竹中工務店 | Dismantling concrete fine grain processing method and processing equipment |
| JP2010285302A (en) * | 2009-06-09 | 2010-12-24 | Tokyo Institute Of Technology | Hydraulic cement composition |
| JP5597467B2 (en) * | 2010-07-23 | 2014-10-01 | 東京電力株式会社 | Manufacturing method of recycled concrete |
| CN109047282A (en) * | 2018-07-27 | 2018-12-21 | 淮北卓颂建筑工程有限公司 | A kind of concrete recycle device |
| CN111013798B (en) * | 2019-12-31 | 2021-06-08 | 安徽傲宇数控科技有限公司 | Material-mixing grinding tank with adjustable discharging |
| CN114029318B (en) * | 2022-01-06 | 2022-03-11 | 济南万华水泥有限责任公司 | Waste recovery device is used in cement component production |
| CN116371543B (en) * | 2023-02-23 | 2023-12-15 | 阳新娲石水泥有限公司 | Portland cement production and processing equipment and method |
| JP7407491B1 (en) | 2023-03-20 | 2024-01-04 | 和泉生コンクリート株式会社 | Method for producing recycled fine aggregate for concrete and method for producing ready-mixed concrete |
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| JPH0952743A (en) * | 1995-08-11 | 1997-02-25 | Nippon Cement Co Ltd | Regenerated aggregate concrete composition |
| JP3200387B2 (en) * | 1997-02-19 | 2001-08-20 | 太平洋セメント株式会社 | Method for producing recycled aggregate for concrete |
| JP4017168B2 (en) * | 2004-07-05 | 2007-12-05 | 関西マテック株式会社 | Manufacturing method of recycled cement and concrete sand |
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