JP5464887B2 - Manufacturing method of recycled fine aggregate - Google Patents
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- JP5464887B2 JP5464887B2 JP2009089373A JP2009089373A JP5464887B2 JP 5464887 B2 JP5464887 B2 JP 5464887B2 JP 2009089373 A JP2009089373 A JP 2009089373A JP 2009089373 A JP2009089373 A JP 2009089373A JP 5464887 B2 JP5464887 B2 JP 5464887B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims description 46
- 239000010419 fine particle Substances 0.000 claims description 14
- 238000011282 treatment Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- 239000004568 cement Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 12
- 238000010298 pulverizing process Methods 0.000 description 7
- 239000000047 product Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 239000011362 coarse particle Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000010333 wet classification Methods 0.000 description 1
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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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- Disintegrating Or Milling (AREA)
- Processing Of Solid Wastes (AREA)
Description
本発明は、コンクリート塊から再生細骨材を製造するための新規な方法に関する。詳しくは、コンクリート塊より、簡便な方法で、且つ、高度に精製された再生細骨材を得ることができる製造する方法に関する。 The present invention relates to a novel method for producing recycled fine aggregates from concrete blocks. In detail, it is related with the manufacturing method which can obtain the regenerated fine aggregate highly purified from the concrete lump by a simple method.
コンクリート塊は、コンクリート建築構造物の解体現場から発生する廃材として得られ、従来は、埋め立ての材料として使用されていた。ところが、近年、埋め立て地の確保が困難となっており、コンクリート塊の処理においても、埋め立て以外の他の処理方法を検討する必要に迫られている。 The concrete block is obtained as a waste material generated from the site of demolition of a concrete building structure, and conventionally used as a material for landfill. However, in recent years, it has become difficult to secure landfills, and it is necessary to consider other processing methods than landfills in the treatment of concrete blocks.
一方、セメントに混合するための細骨材、粗骨材等の骨材は、河川や海において、採取制限が厳しくなり、供給不足の問題が深刻化しつつある。 On the other hand, aggregates such as fine aggregates and coarse aggregates to be mixed with cement are severely restricted in rivers and seas, and the problem of supply shortage is becoming serious.
これらの問題に対して、コンクリート塊より、骨材を回収して再利用しようとする試みが成されている。たとえば、コンクリート塊を骨材の大きさに破砕して使用する方法が挙げられる。しかし、このように、コンクリート塊の破砕物をそのまま使用した場合、得られる破砕物よりなる骨材は、セメント分が多く含まれるため、吸水率が高く、再生骨材ＨのＪＩＳ Ａ ５０２１の規格を満足しないものであった。 In response to these problems, attempts have been made to collect and reuse aggregates from concrete blocks. For example, the method of crushing and using a concrete lump to the size of an aggregate is mentioned. However, in this way, when the crushed concrete lump is used as it is, the aggregate made of the obtained crushed material contains a large amount of cement, so the water absorption is high, and the standard of JIS A 5021 for recycled aggregate H Was not satisfied.
上記問題に対して、セメント分を除去した骨材の製造方法が種々提案されている。例えば、コンクリート塊を加熱炉により熱処理して含有されるセメント硬化体の強度を低下せしめ、これを破砕することにより、骨材から優先的に破砕して除去し、セメント分の付着の少ない骨材を回収する方法が挙げられる（特許文献１参照）。 In order to solve the above problems, various methods for producing aggregates from which cement has been removed have been proposed. For example, by reducing the strength of the hardened cement contained by heat treating a concrete mass in a heating furnace and crushing it, it is preferentially crushed and removed from the aggregate, and the aggregate with less adhesion of cement The method of collect | recovering is mentioned (refer patent document 1).
しかしながら、上記方法は、セメント硬化体を熱劣化させるために、コンクリート塊全体を高温に加熱するための処理を必要とし、多大のエネルギーを使用するばかりでなく、高温設備を必要とし、工業的な実施において、課題が残るものであった。 However, the above-described method requires a treatment for heating the entire concrete block to a high temperature in order to thermally deteriorate the cement hardened body, and not only uses a lot of energy, but also requires a high-temperature facility, and is industrial. In the implementation, problems remained.
従って、本発明の目的は、簡易な設備で、且つ、低エネルギーで、セメント分の付着量が少ない骨材を再生する方法を提供することにある。 Accordingly, an object of the present invention is to provide a method for regenerating an aggregate with simple equipment, low energy, and a small amount of cement.
本発明は、上記目的を達成すべく検討を重ねた結果、コンクリート塊より骨材を回収しようとした場合、コンクリート塊を骨材ごと、細骨材程度の大きさ、すなわち４．７５ｍｍの篩を全通するまで破砕し、さらに、得られる粗破砕体を、ボールミルに供給して湿式処理を行うことにより、骨材を過度に粉砕することなくセメント分の付着量が著しく低減され、吸水率が少なく、前記ＪＩＳ規格を満足した細骨材を得ることができることを見出し、本発明を完成するに至った。 In the present invention, as a result of repeated studies to achieve the above object, when attempting to recover aggregate from a concrete block, the concrete block is aggregated with the aggregate, and the size of the fine aggregate, that is, a 4.75 mm sieve. By crushing until it is completely passed, and supplying the resulting coarsely crushed material to a ball mill for wet treatment, the amount of cement attached is remarkably reduced without excessively crushing the aggregate, and the water absorption rate is increased. The inventors have found that it is possible to obtain a fine aggregate satisfying the JIS standard, and the present invention has been completed.
即ち、本発明は、コンクリート塊を目開き４．７５ｍｍ篩を全通する大きさに乾式破砕した後、得られる粗破砕物をボールミルで湿式破砕処理し、次いで、上記湿式破砕処理により得られる湿式破砕物に含有される微粉を除去することを特徴とする再生細骨材の製造方法である。 That is, in the present invention, a concrete lump is subjected to dry crushing to a size that passes through a 4.75 mm sieve, and the resulting coarsely crushed material is wet-crushed with a ball mill, and then the wet crushing obtained by the wet crushing process. It is a manufacturing method of the regenerated fine aggregate characterized by removing fine powder contained in crushed material.
また、本発明においては、上記再生細骨材の製造方法において、前記コンクリート塊より粗破砕物を得るための乾式破砕を多段で行い、且つ、各段の破砕によって得られる破砕物、即ち、中間破砕物又は粗破砕物より、その粒度分布における細粒側の粒子（以下、細粒側粒子ともいう）の一部を除去する工程を含むことが、吸水率の小さい再生細骨材を効率的に得るために好ましい。 Further, in the present invention, in the method for producing recycled fine aggregate, dry crushing for obtaining coarsely crushed material from the concrete lump is performed in multiple stages, and crushed material obtained by crushing at each stage, that is, intermediate Efficient use of recycled fine aggregate with a low water absorption rate includes the step of removing a part of fine particles (hereinafter also referred to as fine particles) in the particle size distribution from the crushed material or coarsely crushed material. It is preferable to obtain.
本発明の方法によれば、汎用の破砕処理の組み合わせによる簡便な方法で、且つ、高温での加熱処理を特に必要とすることなく、コンクリート塊より、セメント分を高度に除去された再生細骨材を工業的に得ることが可能である。因みに、本発明によれば、吸水率が３％以下の再生細骨材が得ることができる。 According to the method of the present invention, a regenerated fine bone in which a cement content is highly removed from a concrete lump by a simple method using a combination of general-purpose crushing treatments and without particularly requiring heat treatment at high temperatures. The material can be obtained industrially. Incidentally, according to the present invention, a regenerated fine aggregate having a water absorption rate of 3% or less can be obtained.
また、破砕を多段で行ない、且つ、得られる破砕物より細粒側の一部を除去することにより、セメントの成分が該細粒側の破砕物に濃縮されて除去されることにより、得られる破砕物中に残存するセメント分の割合を低減することができ、続く乾式破砕処理、更には、最終的に得られる粗破砕物のボールミルによる湿式破砕処理における処理効率が向上することができる。それ故、コンクリート塊を破砕して得られる破砕物からセメント分が短時間で除去でき、吸水率が低い高純度の再生細骨材を得ることができる。 Moreover, it is obtained by carrying out crushing in multiple stages and removing a part on the fine particle side from the obtained crushed material so that the components of the cement are concentrated and removed to the crushed material on the fine particle side. The proportion of the cement remaining in the crushed material can be reduced, and the processing efficiency in the subsequent dry crushing treatment, and further in the wet crushing treatment of the finally obtained coarse crushed material with a ball mill can be improved. Therefore, the cement content can be removed from the crushed material obtained by crushing the concrete block in a short time, and a high purity recycled fine aggregate with low water absorption can be obtained.
また、本発明の再生細骨材の製造方法は、全工程にわたって加熱処理を行うことなく実施することができるため、工業的な実施において極めて有利な方法であるといえる。 Moreover, since the manufacturing method of the reproduction | regeneration fine aggregate of this invention can be implemented without performing heat processing over all the processes, it can be said that it is a very advantageous method in industrial implementation.
本発明の再生細骨材の製造方法において、原料となるコンクリート塊は、任意の形状を成した塊状のコンクリートが特に制限なく使用される。また、上記コンクリート塊における骨材の含有割合も、特に制限されるものではないが、８０重量％程度のものが一般的である。 In the method for producing a recycled fine aggregate according to the present invention, a concrete block as a raw material is a block concrete having an arbitrary shape without particular limitation. Further, the content ratio of the aggregate in the concrete block is not particularly limited, but is generally about 80% by weight.
また、コンクリート塊の破砕を効率よく実施するため、コンクリート塊が鉄筋等の構造材や樹脂シート等の付着物を含む場合は、これを予め取り除いておくことが必要である。 Further, in order to efficiently crush the concrete lump, when the concrete lump includes a structural material such as a reinforcing bar or a deposit such as a resin sheet, it is necessary to remove this in advance.
本発明において、前記コンクリート塊は、細骨材の大きさにまで各種の破砕方法によって破砕される。破砕物から微粒分を除去すれば粒度では細骨材のＪＩＳ規格を満足するものとなるが、再生骨材Ｈの吸水率の規格である３．５％以下とはならない。このときの吸水率は、一般的には、５−９％である。 In the present invention, the concrete block is crushed by various crushing methods to the size of fine aggregate. If fine particles are removed from the crushed material, the particle size satisfies the JIS standard for fine aggregates, but does not fall below 3.5%, which is the standard for the water absorption rate of recycled aggregate H. The water absorption at this time is generally 5-9%.
本発明において、乾式破砕は、前記大きさまで破砕が可能な破砕装置であれば、公知の破砕装置が特に制限なく使用される。たとえば、ジョークラッシャー、コーンクラッシャー、ロールクラッシャー、ロッドミル、ボールミル等の破砕装置が挙げられる。 In the present invention, as long as the dry crushing is a crushing apparatus capable of crushing to the above-mentioned size, a known crushing apparatus is used without particular limitation. For example, crushing apparatuses such as a jaw crusher, a cone crusher, a roll crusher, a rod mill, and a ball mill can be used.
本発明において、前記コンクリート塊を細骨材の粒度にまで一度に破砕してもよいが、かかる破砕を多段で行ない、且つ、得られる破砕物より細粒側の一部を除去することが好ましい。 In the present invention, the concrete mass may be crushed at once to the fine aggregate particle size, but it is preferable to perform such crushing in multiple stages and to remove a part on the fine particle side from the obtained crushed material. .
即ち、かかる破砕物の篩下側粒子には、セメント分が高濃度で存在しており、これを各段の乾式破砕後に除去することにより、ボールミル処理工程に供給される粗破砕物中のセメント分の割合が著しく低減され、かかる処理において、セメント分を除去するための負荷が軽減され、より一層効率的に吸水率の低い再生細骨材を得ることができる。
上記細粒側粒子の除去の程度は、過度に行うと再生細骨材の歩留まりが低下し、少な過ぎると上記セメント硬化体の除去効果が乏しくなるため、これらを勘案して、適宜決定することが望ましい。かかる除去の程度を例示すれば、各段における破砕粒子の５〜１５重量％の割合となるよう細粒側微粒子を除去することが好ましい。
That is, in the particles under the sieve of the crushed material, a high concentration of cement is present, and the cement in the coarsely crushed material supplied to the ball mill treatment process is removed by dry crushing at each stage. The ratio of the minute is remarkably reduced, and in such treatment, the load for removing the cement is reduced, and a regenerated fine aggregate having a low water absorption rate can be obtained more efficiently.
The degree of removal of the fine-grain side particles is excessively reduced, and the yield of recycled fine aggregate is lowered.If the amount is too small, the effect of removing the hardened cement body is poor. Is desirable. To illustrate the degree of such removal, it is preferable to remove the fine-grain-side fine particles so that the ratio is 5 to 15% by weight of the crushed particles in each stage.
上記細粒側微粒子を篩分けする篩目の大きさは、粒子径が小さいほどセメント分が濃縮する傾向があるため、出来るだけ小さいほうが好ましいが、セメント分の濃縮の程度と工業的に適用しやすいことなどを考慮すると１〜２．５ｍｍが好ましい。 The size of the sieve for sieving the fine particles on the fine grain side is preferably as small as possible because the cement content tends to concentrate as the particle size is smaller. Considering that it is easy, 1 to 2.5 mm is preferable.
尚、本発明において、前記除去された細粒側粒子は、必要に応じて粒度調整し、路盤材として使用することも可能である。 In the present invention, the removed fine grain side particles can be used as roadbed materials by adjusting the grain size as necessary.
本発明において、コンクリート塊を乾式破砕により、前述した細骨材程度の大きさに破砕して得られた粗破砕物は、ボールミルで湿式処理し、次いで、処理により得られる破砕物に含有される、目開き０．１５ｍｍ篩を通過する微粉の割合が１０重量％以下となるように、破砕物より微粉を除去することにより、再生細骨材とされる。 In the present invention, the coarsely crushed material obtained by crushing a concrete lump by dry crushing to the size of the above-mentioned fine aggregate is wet-treated with a ball mill and then contained in the crushed material obtained by the treatment. The fine fine powder is removed from the crushed material so that the proportion of fine powder passing through a sieve having an aperture of 0.15 mm is 10% by weight or less.
即ち、上記粗破砕物を処理することによって、粗破砕物に付着しているセメント分が優先的に破砕され、微粉となって骨材より効果的に除去される。 That is, by treating the coarsely crushed material, the cement component adhering to the coarsely crushed material is preferentially crushed and becomes fine powder and effectively removed from the aggregate.
前記ボールミル処理は、乾式処理も可能ではあるが、処理の効率がよいことと、骨材の角部が削られることで、実積率の高い良質な細骨材を得やすい傾向があるので湿式処理が好ましい。使用するメディアとしてのボールは、一般にボールミルに使用されている公知の材質のボールが特に制限なく使用される。代表的な材質を例示すれば、鉄、ステンレスの金属、アルミナ、ジルコニア等のセラミックスが挙げられる。また、上記ボールの粒径（直径）は重要で大きすぎると吸水率が小さくなる前に骨材が小さくなってしまい、目的を達成することが出来ない。逆に小さすぎると処理効率が大幅に低下してしまう。このことを考慮すると、１０〜３０ｍｍ直径のボールを選ぶことが好ましい。 The ball mill treatment can be dry treatment, but it is easy to obtain high-quality fine aggregate with a high actual volume ratio because the processing efficiency is good and the corners of the aggregate are scraped. Treatment is preferred. As a ball used as a medium to be used, a ball of a known material generally used in a ball mill is used without particular limitation. Examples of typical materials include iron, stainless steel, ceramics such as alumina and zirconia. Further, the particle diameter (diameter) of the ball is important, and if it is too large, the aggregate becomes small before the water absorption rate becomes small, and the object cannot be achieved. On the other hand, if it is too small, the processing efficiency is greatly reduced. Considering this, it is preferable to select a ball having a diameter of 10 to 30 mm.
また、湿式破砕に使用する媒体は、水が一般的であり、その量は、粗破砕物１００重量部に対して、４０〜８０重量部が適当である。 The medium used for wet crushing is generally water, and the amount is suitably 40 to 80 parts by weight with respect to 100 parts by weight of the coarsely crushed material.
本発明において、湿式粉砕の時間は、得られる湿式破砕物におけるセメント分の付着量の量をチェックして、適宜決定すればよいが、０．５時間以上、好ましくは、１時間以上であれば十分である。また、湿式粉砕は、余り長時間行うと、効果が頭打ちとなるばかりでなく、得られる細骨材の歩留まりが低下するため、２時間以内とすることが好ましい。 In the present invention, the wet pulverization time may be appropriately determined by checking the amount of the cement content in the obtained wet crushed material, but is 0.5 hours or longer, preferably 1 hour or longer. It is enough. In addition, if the wet pulverization is performed for an excessively long time, not only will the effect reach a peak, but the yield of the fine aggregate obtained will be reduced, so that it is preferably within 2 hours.
本発明において、湿式粉砕して得られた湿式破砕物は、セメント硬化体に起因する成分を主とする微粉を除去することにより、目的とする細骨材を得ることができる。上記、微粉の除去の程度は、乾燥後に、目開き０．１５ｍｍ篩を通過する微粉の割合が１０重量％以下となるように行う。また、上記微粉の除去は、湿式粉砕物がスラリーの状態で得られることより、湿式分級装置、たとえば、液体サイクロン、スパイラル分級機等を使用して行うことが好ましい。この後除去された微粉は、ろ過によって分離され、ろ液は循環使用される。 In the present invention, the wet crushed material obtained by wet pulverization can obtain the desired fine aggregate by removing fine powders mainly composed of the components resulting from the hardened cement. The degree of fine powder removal is performed so that the proportion of fine powder passing through a sieve having a mesh size of 0.15 mm is 10% by weight or less after drying. The fine powder is preferably removed using a wet classifier such as a liquid cyclone or a spiral classifier because the wet pulverized product is obtained in a slurry state. The fine powder removed after this is separated by filtration, and the filtrate is recycled.
以下、本発明の方法を、代表的な態様を示す図１に従って説明する。 Hereinafter, the method of the present invention will be described with reference to FIG.
前記コンクリート塊１を目開き４．７５ｍｍ篩を全通する大きさに乾式破砕して粗破砕物を得る操作を、２台の乾式粉砕装置２−１及び２−２を使用した多段で行い、各段の破砕よって得られる破砕物（中間破砕物５’、粗破砕物５）より、その粒度分布における細粒側の粒子の一部７’、７を除去する。
The operation of obtaining a coarsely crushed material by dry crushing the concrete lump 1 to a size that passes through a 4.75 mm sieve is performed in multiple stages using two dry crushers 2-1 and 2-2, From the crushed material (intermediate crushed material 5 ′, coarse crushed material 5) obtained by crushing at each stage, the fine
上記乾式破砕によって得られる粗破砕物５は、ボールミル３で湿式破砕処理し、次いで、上記湿式破砕処理により得られる湿式破砕物に含有される微粉８を、湿式分級装置４によって除去することにより、高度に精製された再生細骨材６が得られる。 The coarsely crushed product 5 obtained by the dry crushing is wet crushed by the ball mill 3, and then the fine powder 8 contained in the wet crushed product obtained by the wet crushing treatment is removed by the wet classifier 4, A highly refined recycled fine aggregate 6 is obtained.
以下、本発明を更に具体的に説明するために実施例を示すが、本発明は、これらの実施例に限定されるものではない。 EXAMPLES Hereinafter, examples will be shown to describe the present invention more specifically, but the present invention is not limited to these examples.
尚、実施例において、吸水率の測定はＪＩＳＡ１１０９、粗粒率の測定はＪＩＳＡ１１０２に記載の方法にて行った。 In Examples, the water absorption was measured by the method described in JIS A1109, and the coarse particle ratio was measured by the method described in JIS A1102.
実施例１
鉄筋等を除去されたコンクリート塊をジョークラッシャー、ロールクラッシャーを使用して、目開き４．７５ｍｍ篩を全通し、且つ、２ｍｍ篩上５％になるよう破砕して粗破砕物を得た。
Example 1
Using a jaw crusher and a roll crusher, the concrete block from which the reinforcing bars and the like were removed was crushed so as to pass through a 4.75 mm sieve and 5% on a 2 mm sieve to obtain a coarsely crushed product.
上記粗破砕物５００ｇを２０ｍｍの径のアルミナボール１ｋｇの入った内容積５リットルのポットミルに水３５０ｇと共に入れ、表１の時間粉砕した。粉砕後１０５ミクロン以下の微粉を除去した後、吸水率を測定し、さらに粗粒率も測定した。 500 g of the coarsely crushed material was put in a pot mill having an internal volume of 5 liters containing 1 kg of alumina balls having a diameter of 20 mm together with 350 g of water, and pulverized for the time shown in Table 1. After the pulverization, fine particles of 105 microns or less were removed, the water absorption was measured, and the coarse particle ratio was also measured.
その結果、粉砕時間を長くするほど吸水率が小さくなってくることがわかる。粉砕時間を長くしても、出来た細骨材の粒度はほぼ変わらないことがわかった。 As a result, it can be seen that the water absorption decreases as the pulverization time increases. It was found that even if the pulverization time was increased, the particle size of the fine aggregate was almost unchanged.
実施例２
鉄筋等を除去された、実施例１とは別のコンクリート塊を、図１に記載の方法に従い再生細骨材を製造した。先ず、一段目の破砕として、ジョークラッシャーを使用し、１．３８ｍｍの篩下割合が所定の割合になるまで破砕し、上記篩下を細粒側の粒子として除去した。篩上の中間破砕物を、実施例１と同様な粗破砕物が得られるように第二段目の乾式破砕を行い、細粒側の粒子５重量％を除去した。
Example 2
A recycled fine aggregate was produced from a concrete mass different from Example 1 from which the reinforcing bars and the like were removed, according to the method shown in FIG. First, as a first stage crush, a jaw crusher was used, and the crushing ratio of 1.38 mm was crushed until a predetermined ratio, and the crushing was removed as fine particles. The intermediate crushed material on the sieve was subjected to second-stage dry crushing so that the same coarsely crushed material as in Example 1 was obtained, and 5% by weight of fine particles were removed.
その後、得られた粗破砕物を湿式粉砕、及び、微粉除去を行い、同様の測定を行った。 Then, the obtained coarsely crushed material was wet crushed and fine powder was removed, and the same measurement was performed.
その結果、５％、１０％の篩下除去の場合は、総合的な歩留まりは変わらずに、ボールミル粉砕時間を短縮でき、効率的に本発明を実施し得ることがわかった。 As a result, it was found that in the case of 5% and 10% under-sieving removal, the overall yield was not changed, and the ball mill pulverization time could be shortened and the present invention could be implemented efficiently.
１ コンクリート塊
２ 乾式粉砕装置
３ ボールミル
４ 湿式分級装置
５ 破砕物（中間破砕物５’、粗破砕物５）
６ 再生細骨材
７、７’ 粒度分布における細粒側の粒子の一部
８ 微粉
DESCRIPTION OF SYMBOLS 1 Concrete lump 2 Dry crushing device 3 Ball mill 4 Wet classification device 5 Crushed material (intermediate crushed material 5 ', rough crushed material 5)
6 Recycled
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