JP6994179B1 - How to recover coarse aggregate and wash water for coarse aggregate - Google Patents
How to recover coarse aggregate and wash water for coarse aggregate Download PDFInfo
- Publication number
- JP6994179B1 JP6994179B1 JP2021096618A JP2021096618A JP6994179B1 JP 6994179 B1 JP6994179 B1 JP 6994179B1 JP 2021096618 A JP2021096618 A JP 2021096618A JP 2021096618 A JP2021096618 A JP 2021096618A JP 6994179 B1 JP6994179 B1 JP 6994179B1
- Authority
- JP
- Japan
- Prior art keywords
- coarse aggregate
- water
- ready
- mixed
- mixed concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 150
- 239000004567 concrete Substances 0.000 claims abstract description 94
- 238000005406 washing Methods 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims description 74
- 238000003756 stirring Methods 0.000 claims description 36
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 34
- 230000003068 static effect Effects 0.000 claims description 24
- 239000001569 carbon dioxide Substances 0.000 claims description 17
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 17
- 239000004570 mortar (masonry) Substances 0.000 abstract description 22
- 239000000463 material Substances 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 21
- 239000002351 wastewater Substances 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000004576 sand Substances 0.000 description 8
- 239000008399 tap water Substances 0.000 description 7
- 235000020679 tap water Nutrition 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- -1 etc.) Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000004898 kneading Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000004815 dispersion polymer Substances 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Landscapes
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
【課題】モルタル成分の付着量が比較的少ない粗骨材を回収することができる粗骨材の回収方法を提供することを課題とする。【解決手段】生コンクリートから粗骨材を回収する粗骨材の回収方法であって、生コンクリートまたは生コンクリートから回収した粗骨材を洗浄水と混合して混合水を形成することで粗骨材を洗浄する洗浄工程と、洗浄工程後、混合水から粗骨材を回収する回収工程と、を備えており、洗浄水は、炭酸水から構成される。【選択図】なしPROBLEM TO BE SOLVED: To provide a method for recovering a coarse aggregate capable of recovering a coarse aggregate having a relatively small amount of adhered mortar component. SOLUTION: This is a method for recovering coarse aggregate from ready-mixed concrete, in which coarse aggregate recovered from ready-mixed concrete or ready-mixed concrete is mixed with washing water to form mixed water. It includes a washing step of washing the material and a recovery step of recovering the coarse aggregate from the mixed water after the washing step, and the washing water is composed of carbonated water. [Selection diagram] None
Description
本発明は、生コンクリートから粗骨材を回収する粗骨材の回収方法、および、該回収方法で用いる粗骨材用洗浄水に関する。 The present invention relates to a method for recovering coarse aggregate from ready-mixed concrete and a washing water for coarse aggregate used in the recovery method.
生コンクリートの製造や運搬、生コンクリートを用いた製品の製造等を行った際に残る生コンクリートから粗骨材を回収し、回収した粗骨材を再び生コンクリートの材料として使用する場合がある。生コンクリートから粗骨材を回収する方法としては、例えば、特許文献１には、生コンクリートと接触した設備を洗浄水で洗浄し、生コンクリートを含む洗浄水を篩に通すことで、篩上に残る粗骨材を回収する方法が提案されている。 Coarse aggregate may be recovered from the ready-mixed concrete remaining when manufacturing and transporting ready-mixed concrete, manufacturing of products using ready-mixed concrete, etc., and the recovered coarse aggregate may be used again as the material for ready-mixed concrete. As a method for recovering coarse aggregate from ready-mixed concrete, for example, in Patent Document 1, equipment in contact with ready-mixed concrete is washed with washing water, and washing water containing ready-mixed concrete is passed through a sieve to be placed on a sieve. A method of recovering the remaining coarse aggregate has been proposed.
しかしながら、上記のような方法では、生コンクリートを構成していた粗骨材以外の成分（以下では、「モルタル成分」とも記す）が、回収した粗骨材に比較的多く付着した状態となる。このような状態の粗骨材を用いて生コンクリートを製造すると、所望する性状（流動性や強度など）の生コンクリートを製造することができない。このため、モルタル成分の付着量が比較的少ない粗骨材を回収することができる粗骨材の回収方法が要求されている。 However, in the above method, components other than the coarse aggregate constituting the ready-mixed concrete (hereinafter, also referred to as “mortar component”) are in a state of being adhered to the recovered coarse aggregate in a relatively large amount. When ready-mixed concrete is manufactured using the coarse aggregate in such a state, it is not possible to manufacture ready-mixed concrete having desired properties (fluidity, strength, etc.). Therefore, there is a demand for a method for recovering coarse aggregate that can recover coarse aggregate having a relatively small amount of adhered mortar component.
そこで、本発明は、モルタル成分の付着量が比較的少ない粗骨材を回収することができる粗骨材の回収方法、および、斯かる回収方法で用いる粗骨材用洗浄水を提供することを課題とする。 Therefore, the present invention provides a method for recovering coarse aggregate capable of recovering coarse aggregate having a relatively small amount of adhered mortar component, and a washing water for coarse aggregate used in such recovery method. Make it an issue.
本発明に係る粗骨材の回収方法は、生コンクリートから粗骨材を回収する粗骨材の回収方法であって、生コンクリートまたは生コンクリートから回収した粗骨材を洗浄水と混合して混合水を形成することで粗骨材を洗浄する洗浄工程と、洗浄工程後、混合水から粗骨材を回収する回収工程と、を備えており、洗浄水は、炭酸水から構成される。 The method for recovering coarse aggregate according to the present invention is a method for recovering coarse aggregate from ready-mixed concrete, in which coarse aggregate recovered from ready-mixed concrete or ready-mixed concrete is mixed with wash water and mixed. It includes a washing step of washing the coarse aggregate by forming water and a recovery step of recovering the coarse aggregate from the mixed water after the washing step, and the washing water is composed of carbonated water.
炭酸水は、二酸化炭素濃度が０．１７ｇ／ｌ～１．７２ｇ／ｌであってもよい。 The carbonated water may have a carbon dioxide concentration of 0.17 g / l to 1.72 g / l.
洗浄工程は、生コンクリートまたは生コンクリートから分離した粗骨材を炭酸水と混合して混合水を形成する混合工程と、混合水を攪拌する攪拌洗浄工程および混合水を攪拌せずに静置する静置洗浄工程の少なくとも一方とを備えてもよい。 The cleaning steps include a mixing step of mixing ready-mixed concrete or coarse aggregate separated from ready-mixed concrete with carbonated water to form mixed water, a stirring cleaning step of stirring the mixed water, and standing the mixed water without stirring. It may include at least one of the static cleaning steps.
洗浄工程で使用する炭酸水の体積は、生コンクリートの体積に対して１００％以上であってもよい。 The volume of carbonated water used in the cleaning step may be 100% or more with respect to the volume of ready-mixed concrete.
本発明に係る粗骨材用洗浄水は、上記の粗骨材の回収方法で生コンクリートまたは生コンクリートから分離した粗骨材と混合する洗浄水であって、炭酸水から構成される。 The cleaning water for coarse aggregate according to the present invention is cleaning water mixed with ready-mixed concrete or coarse aggregate separated from ready-mixed concrete by the above-mentioned method for recovering coarse aggregate, and is composed of carbonated water.
本発明に係る粗骨材用洗浄水は、二酸化炭素濃度が０．１７ｇ／ｌ～１．７２ｇ／ｌであってもよい。 The washing water for coarse aggregate according to the present invention may have a carbon dioxide concentration of 0.17 g / l to 1.72 g / l.
以上のように、本発明によれば、モルタル成分の付着量が比較的少ない粗骨材を回収することができる。 As described above, according to the present invention, it is possible to recover the coarse aggregate having a relatively small amount of the mortar component attached.
＜第一実施形態＞
以下、本発明の第一実施形態について説明する。
<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described.
本実施形態に係る粗骨材の回収方法は、生コンクリートから粗骨材を回収するものである。生コンクリートは、流動性を有するものである。また、生コンクリートは、少なくともセメントと粗骨材と細骨材と水とが混練されて形成されるものである。なお、以下では、生コンクリートを構成する粗骨材以外の成分をモルタル成分とも記す。 The method for recovering coarse aggregate according to the present embodiment is to recover coarse aggregate from ready-mixed concrete. Ready-mixed concrete has fluidity. Further, ready-mixed concrete is formed by kneading at least cement, coarse aggregate, fine aggregate and water. In the following, components other than the coarse aggregate constituting the ready-mixed concrete are also referred to as mortar components.
セメントとしては、特に限定されず、市場で入手できる種々のセメントを用いることができる。具体的には、セメントとしては、普通ポルトランドセメント、早強ポルトランドセメント等の各種ポルトランドセメントや、高炉セメント、シリカセメント及びフライアッシュセメント等の各種混合セメントが挙げられる。また、他のセメントとしては、例えば、白色ポルトランドセメント、アルミナセメントが挙げられる。また、さらに他のセメントとしては、例えば、カルシウムアルミネート系、カルシウムサルフォアルミネート系、カルシウムフルオロアルミネート系等の超速硬セメントが挙げられる。そして、セメントとしては、上記の各セメントの一つを用いてもよく、複数を混合して用いてもよい。 The cement is not particularly limited, and various cements available on the market can be used. Specifically, examples of cement include various Portland cements such as ordinary Portland cement and early-strength Portland cement, and various mixed cements such as blast furnace cement, silica cement and fly ash cement. Examples of other cements include white Portland cement and alumina cement. Further, examples of other cements include ultrafast-hardening cements such as calcium aluminate-based, calcium sulfoluminate-based, and calcium fluoroaluminate-based cements. As the cement, one of the above cements may be used, or a plurality of cements may be mixed and used.
粗骨材は、５ｍｍの篩目を通過しないものが８５質量％以上となるサイズのものを用いることができる。具体的には、粗骨材としては、砂岩砕石、玉砂利（川砂利）、天然軽量粗骨材（パーライト、ヒル石等）、副産軽量粗骨材、人工軽量粗骨材、再生骨材等が挙げられる。セメントに対する粗骨材の使用量としては、特に限定されるものではなく、例えば、１５０質量％以上５００質量％以下であってもよく、１６０質量％以上４９０質量％以下であってもよい。 As the coarse aggregate, a material having a size of 85% by mass or more that does not pass through a 5 mm sieve can be used. Specifically, as coarse aggregate, sandstone crushed stone, ball gravel (river gravel), natural lightweight coarse aggregate (perlite, hill stone, etc.), by-product lightweight coarse aggregate, artificial lightweight coarse aggregate, recycled aggregate, etc. Can be mentioned. The amount of the coarse aggregate used for the cement is not particularly limited, and may be, for example, 150% by mass or more and 500% by mass or less, or 160% by mass or more and 490% by mass or less.
細骨材は、１０ｍｍの篩目をすべて通過し、５ｍｍの篩目を通過するものが８５質量％以上となるサイズのものを用いることができる。具体的には、細骨材としては、山砂、川砂、陸砂、及び、海砂等の天然砂や、砂岩，石灰岩等を人工的に破砕して形成された砕砂（より詳しくは、石灰砕砂等）が挙げられる。セメントに対する細骨材の使用量としては、特に限定されるものではなく、例えば、１５０質量％以上５００質量％以下であってもよく、１６０質量％以上４９０質量％以下であってもよい。 As the fine aggregate, a material having a size of 85% by mass or more that passes through all the 10 mm sieves and passes through the 5 mm sieve can be used. Specifically, as fine aggregates, natural sand such as mountain sand, river sand, land sand, and sea sand, and crushed sand formed by artificially crushing sandstone, limestone, etc. (more specifically, lime). Crushed sand, etc.). The amount of the fine aggregate used for the cement is not particularly limited, and may be, for example, 150% by mass or more and 500% by mass or less, or 160% by mass or more and 490% by mass or less.
なお、上記の粗骨材及び細骨材のサイズは、ＪＩＳ Ａ １１０２に従う骨材の篩分け試験方法によって測定されるもので、ＪＩＳ Ｚ ８８０１－１の試験用篩目を表したものである。 The sizes of the coarse aggregate and the fine aggregate are measured by the screening test method of the aggregate according to JIS A 1102, and represent the test mesh of JIS Z 8801-1.
また、生コンクリートに含まる他の材料としては、特に限定されるものではなく、例えば、繊維材（ガラス繊維、鋼繊維、ビニロン繊維、アラミド繊維、ポリプロピレン繊維、炭素繊維等）、混和材（高炉スラグ、フライアッシュ、シリカフューム、膨張材等）、混和剤（減水剤、増粘剤、消泡剤等）等が挙げられる。 The other materials contained in the ready-mixed concrete are not particularly limited, and are, for example, fiber materials (glass fiber, steel fiber, vinylon fiber, aramid fiber, polypropylene fiber, carbon fiber, etc.) and admixture (blast furnace). Examples include slag, fly ash, silica fumes, swelling materials, etc.), admixtures (water reducing agents, thickening agents, defoaming agents, etc.).
水としては、特に限定されず、例えば、一般的な上水道水、地下水、後述する回収水等を用いることができる。また、水は、例えば、モルタルやコンクリートを混練する際に使用する減水剤等の混和剤、ポリマーディスパージョン液、収縮低減剤、凝結調整剤等を含むものであってもよい。 The water is not particularly limited, and for example, general tap water, groundwater, recovered water described later, and the like can be used. Further, the water may contain, for example, an admixture such as a water reducing agent used when kneading mortar or concrete, a polymer dispersion liquid, a shrinkage reducing agent, a coagulation adjusting agent and the like.
本実施形態に係る粗骨材の回収方法は、生コンクリートを洗浄水（粗骨材用洗浄水）と混合して混合水を形成する洗浄工程を備える。また、本実施形態に係る粗骨材の回収方法は、混合水から粗骨材を回収する回収工程を備える。 The method for recovering coarse aggregate according to the present embodiment includes a cleaning step of mixing ready-mixed concrete with cleaning water (cleaning water for coarse aggregate) to form mixed water. Further, the method for recovering the coarse aggregate according to the present embodiment includes a recovery step for recovering the coarse aggregate from the mixed water.
洗浄工程で用いる洗浄水（粗骨材用洗浄水）は、炭酸水から構成される。該炭酸水の二酸化炭素濃度（生コンクリートとの混合時の二酸化炭素濃度）としては、特に限定されず、例えば、０．２ｇ／ｌ～１．７ｇ／ｌであることが好ましく、０．９ｇ／ｌ～１．７ｇ／ｌであることがより好ましい。二酸化炭素濃度は、下記実施例に記載の方法で測定することができる。生コンクリートと混合する炭酸水の量（体積）としては、特に限定されず、例えば、生コンクリートの体積に対して、好ましくは１００％以上、より詳しくは、１００％超である。 The washing water (washing water for coarse aggregate) used in the washing step is composed of carbonated water. The carbon dioxide concentration of the carbonated water (carbon dioxide concentration when mixed with ready-mixed concrete) is not particularly limited, and is preferably 0.2 g / l to 1.7 g / l, for example, 0.9 g / l. It is more preferably l to 1.7 g / l. The carbon dioxide concentration can be measured by the method described in the following Examples. The amount (volume) of carbonated water to be mixed with the ready-mixed concrete is not particularly limited, and is preferably 100% or more, more specifically, more than 100% with respect to the volume of the ready-mixed concrete.
炭酸水の作製方法としては、特に限定されず、例えば、上水道水に二酸化炭素を吹き込む方法、地下水に二酸化炭素を吹き込む方法、および、生コンクリートの製造工場で発生する回収水に二酸化炭素を吹き込む方法等が挙げられる。回収水としては、生コンクリートと接触する設備を洗浄した際に生じる洗浄廃水（生コンクリートを含むもの）から粗骨材および細骨材を除いたものが挙げられる。また、回収水としては、例えば、セメントから溶出した水酸化カルシウム等を含み、アルカリ性が比較的高いもの（具体的には、ｐＨ１０～１２であるもの）が挙げられる。また、回収水は、セメント等の固形分を含むスラッジ水であってもよく、スラッジ水から固形分を除去した上澄水であってもよい。炭酸水を作製する際に用いる二酸化炭素としては、例えば、市販されているもの、各種工場（例えば、セメント工場、生コンクリート工場、コンクリート製品の製造工場等）の設備（例えば、ボイラー設備等）で発生するガスに含まれるもの等が挙げられる。炭酸水の作製は、例えば、後述する混合工程の直前に行うことが好ましい。 The method for producing carbonated water is not particularly limited, and for example, a method of blowing carbon dioxide into tap water, a method of blowing carbon dioxide into groundwater, and a method of blowing carbon dioxide into recovered water generated in a ready-mixed concrete manufacturing plant. And so on. Examples of the recovered water include cleaning wastewater (including ready-mixed concrete) generated when equipment in contact with ready-mixed concrete is washed, excluding coarse aggregate and fine aggregate. Further, examples of the recovered water include those containing calcium hydroxide or the like eluted from cement and having a relatively high alkalinity (specifically, those having a pH of 10 to 12). Further, the recovered water may be sludge water containing solid content such as cement, or may be supernatant water obtained by removing solid content from sludge water. The carbon dioxide used when producing carbonated water is, for example, commercially available equipment, equipment of various factories (for example, cement factory, ready-mixed concrete factory, concrete product manufacturing factory, etc.) (for example, boiler equipment, etc.). Examples include those contained in the generated gas. The production of carbonated water is preferably performed immediately before, for example, the mixing step described later.
本実施形態では、洗浄工程は、生コンクリートを炭酸水（粗骨材用洗浄水）と混合して混合水を形成する混合工程を備える。また、洗浄工程は、混合水を攪拌する攪拌洗浄工程、および、混合水を攪拌せずに静置する静置洗浄工程の少なくとも一方を備える。 In the present embodiment, the cleaning step includes a mixing step of mixing ready-mixed concrete with carbonated water (cleaning water for coarse aggregate) to form mixed water. Further, the washing step includes at least one of a stirring washing step of stirring the mixed water and a static washing step of standing the mixed water without stirring.
混合工程は、生コンクリート自体を炭酸水と混合することで行ってもよく、生コンクリートと接触した設備を洗浄した際に生じる洗浄廃水（生コンクリートを含むもの）を炭酸水と混合することで行ってもよい。混合工程は、例えば、生コンクリートを収容した容器に炭酸水を供給し、該容器内で生コンクリート自体を炭酸水と混合することで行ってもよく、洗浄廃水（生コンクリートを含むもの）を収容した容器に炭酸水を供給し、該容器内で洗浄廃水（生コンクリートを含むもの）を炭酸水と混合することで行ってもよく、または、炭酸水を収容した容器に生コンクリートまたは洗浄廃水を供給し、斯かる容器内で生コンクリートまたは洗浄廃水を炭酸水と混合することで行ってもよい。 The mixing step may be performed by mixing the ready-mixed concrete itself with carbonated water, or by mixing the cleaning waste water (including ready-mixed concrete) generated when cleaning the equipment in contact with the ready-mixed concrete with the carbonated water. You may. The mixing step may be performed, for example, by supplying carbonated water to a container containing ready-made concrete and mixing the ready-made concrete itself with carbonated water in the container, and accommodating cleaning waste water (including ready-made concrete). You may do this by supplying carbonated water to the container and mixing the cleaning waste water (including fresh concrete) with the carbonated water in the container, or you can put the fresh concrete or cleaning waste water in the container containing the carbonated water. It may be supplied by mixing ready-mixed concrete or cleaning waste water with carbonated water in such a container.
炭酸水を供給する容器（生コンクリートまたは洗浄廃水を収容した容器）としては、特に限定されず、例えば、アジテータ車のドラム型容器、生コンクリートを混練するミキサ、これらから排出された生コンクリートまたは洗浄廃水を収容する容器、および、生コンクリートまたは洗浄廃水を流通させる配管等が挙げられる。また、炭酸水を供給する他の容器としては、洗浄廃水から粗骨材を除去したものを収容する集水槽等が挙げられる。 The container for supplying carbonated water (concrete or a container containing cleaning wastewater) is not particularly limited, and for example, a drum-shaped container for an agitator car, a mixer for kneading ready-mixed concrete, and ready-mixed concrete or cleaning discharged from these. Examples include a container for accommodating waste water and a pipe for circulating ready-mixed concrete or cleaning waste water. Further, as another container for supplying carbonated water, a water collecting tank or the like for accommodating a container obtained by removing coarse aggregate from washing wastewater can be mentioned.
攪拌洗浄工程は、例えば、混合水を収容する容器（以下では、「混合水容器」とも記す）を回転させること、または、該混合水容器内の混合水中で攪拌翼を回転させること等で行うことができる。例えば、混合水容器がアジテータ車のドラム型容器である場合、該ドラム型容器を回転させることで混合水を攪拌することができる。なお、ドラム型容器の回転とは、ドラム型容器を、一方向へ１回転以上させることであってもよく、３６０°未満の所定角度だけ一方向へ回転させることであってもよい。また、ドラム型容器の回転は、一方向への回転と逆方向への回転を交互に行うことであってもよい。 The stirring and washing step is performed, for example, by rotating a container (hereinafter, also referred to as “mixed water container”) containing mixed water, or rotating a stirring blade in the mixed water in the mixed water container. be able to. For example, when the mixed water container is a drum type container of an agitator truck, the mixed water can be agitated by rotating the drum type container. The rotation of the drum-type container may mean rotating the drum-type container one or more times in one direction, or may rotate the drum-type container in one direction by a predetermined angle of less than 360 °. Further, the rotation of the drum type container may be performed by alternately rotating in one direction and rotating in the opposite direction.
攪拌洗浄工程は、炭酸水の量が上記の範囲で行うことが好ましい。また、攪拌洗浄工程を行う時間としては、特に限定されず、例えば、３秒以上であってもよく、５秒以上であってもよい。攪拌洗浄工程は、混合工程と並行して行ってもよく、混合工程後に行ってもよい。また、攪拌洗浄工程は、粗骨材へのモルタル成分の付着状況を確認することで終了するか継続するかを判断することが好ましい。付着状況の確認は、後述する実施例に記載の除去率を確認することで行うことができる。例えば、除去率が９９％以上となったことを確認してから攪拌洗浄工程を終了することが好ましい。 The stirring and washing step is preferably performed in the above range of the amount of carbonated water. The time for performing the stirring and washing step is not particularly limited, and may be, for example, 3 seconds or longer, or 5 seconds or longer. The stirring and washing step may be performed in parallel with the mixing step or may be performed after the mixing step. Further, it is preferable to determine whether the stirring and washing step is to be completed or continued by confirming the state of adhesion of the mortar component to the coarse aggregate. The adhesion status can be confirmed by confirming the removal rate described in Examples described later. For example, it is preferable to end the stirring and washing step after confirming that the removal rate is 99% or more.
静置洗浄工程は、混合水を、所定時間、攪拌せずに静置することで行うことができる。また、静置洗浄工程は、炭酸水量が上記の範囲で行うことが好ましい。静置洗浄工程を行う時間としては、特に限定されず、例えば、１０秒以上であってもよく、１５秒以上であってもよい。静置洗浄工程は、混合工程と並行して行ってもよく、混合工程後に行ってもよい。静置洗浄工程は、粗骨材へのモルタル成分の付着状況を確認することで終了するか継続するかを判断することが好ましい。付着状況の確認は、後述する実施例に記載の除去率を確認することで行うことができる。例えば、除去率が９９％以上となったことを確認してから静置洗浄工程を終了することが好ましい。 The static cleaning step can be performed by allowing the mixed water to stand for a predetermined time without stirring. Further, it is preferable that the static washing step is performed in the above range of the amount of carbonated water. The time for performing the static cleaning step is not particularly limited, and may be, for example, 10 seconds or longer, or 15 seconds or longer. The static cleaning step may be performed in parallel with the mixing step, or may be performed after the mixing step. It is preferable to determine whether the static cleaning step is terminated or continued by confirming the state of adhesion of the mortar component to the coarse aggregate. The adhesion status can be confirmed by confirming the removal rate described in Examples described later. For example, it is preferable to end the static cleaning step after confirming that the removal rate is 99% or more.
洗浄工程では、攪拌洗浄工程および静置洗浄工程のどちらか一方を１回のみ行ってもよく、攪拌洗浄工程および静置洗浄工程を交互に１回以上行ってもよい。攪拌洗浄工程と静置洗浄工程とを交互に行う場合としては、例えば、最初に攪拌洗浄工程を行った後、静置洗浄工程を行う場合、最初に静置洗浄工程を行った後、攪拌洗浄工程を行う場合等が挙げられる。 In the cleaning step, either one of the stirring cleaning step and the static cleaning step may be performed only once, or the stirring cleaning step and the static cleaning step may be alternately performed once or more. When the stirring cleaning step and the static cleaning step are alternately performed, for example, when the stirring cleaning step is first performed and then the static cleaning step is performed, the static cleaning step is first performed and then the stirring cleaning is performed. Examples include the case where a process is performed.
本実施形態に係る粗骨材の回収方法は、混合水容器内から、混合水を排出する排出工程を備えてもよい。排出工程は、洗浄工程後に行ってもよく、洗浄工程と並行して行ってもよい。排出工程を洗浄工程と並行して行う場合としては、混合工程後に攪拌洗浄工程または静置洗浄工程を行いつつ排出工程を行う場合、または、混合工程と攪拌洗浄工程または静置洗浄工程とを行いつつ排出工程を行う場合が挙げられる。また、排出工程を洗浄工程と並行して行う場合、洗浄工程は、炭酸水の量を上記の範囲に維持しつつ行うことが好ましい。 The method for recovering the coarse aggregate according to the present embodiment may include a discharge step of discharging the mixed water from the mixed water container. The discharge step may be performed after the cleaning step or may be performed in parallel with the cleaning step. When the discharge step is performed in parallel with the cleaning step, the discharge step is performed while performing the stirring cleaning step or the static cleaning step after the mixing step, or the mixing step and the stirring cleaning step or the static cleaning step are performed. There is a case where the discharge process is performed while doing so. When the discharge step is performed in parallel with the cleaning step, it is preferable that the cleaning step is performed while maintaining the amount of carbonated water within the above range.
本実施形態では、回収工程は、洗浄工程の後（具体的には、排出工程の後）に行う。回収工程を行う方法としては、特に限定されず、例えば、洗浄工程後の混合水を篩に通し、篩上に残る粗骨材を回収する方法等が挙げられる。混合水を通す篩としては、特に限定されず、例えば、コンベア等の搬送機に付いた篩や、搬送機とは別体の篩等が挙げられる。篩目としては、粗骨材の大きさによって適宜選択することができる。 In the present embodiment, the recovery step is performed after the cleaning step (specifically, after the discharging step). The method of performing the recovery step is not particularly limited, and examples thereof include a method of passing the mixed water after the washing step through a sieve and recovering the coarse aggregate remaining on the sieve. The sieve through which the mixed water is passed is not particularly limited, and examples thereof include a sieve attached to a conveyor such as a conveyor and a sieve separate from the conveyor. The sieve mesh can be appropriately selected depending on the size of the coarse aggregate.
＜第二実施形態＞
第二実施形態に係る粗骨材の回収方法は、第一実施形態と比較して、生コンクリートから分離した粗骨材を洗浄工程で用いる点が主に異なる。そこで、以下では、第一実施形態と異なる点について説明し、共通する点については、説明を繰り返さない。
<Second embodiment>
The method for recovering the coarse aggregate according to the second embodiment is mainly different from the first embodiment in that the coarse aggregate separated from the ready-mixed concrete is used in the cleaning step. Therefore, in the following, the points different from the first embodiment will be described, and the common points will not be repeated.
第二実施形態に係る粗骨材の回収方法は、生コンクリートから粗骨材を回収する第一回収工程を備える。該第一回収工程は、洗浄工程の前に行う。 The method for recovering coarse aggregate according to the second embodiment includes a first recovery step for recovering coarse aggregate from ready-mixed concrete. The first recovery step is performed before the cleaning step.
第一回収工程を行う方法としては、特に限定されず、例えば、生コンクリートと接触する設備を洗浄した際に生じる洗浄廃水（生コンクリートを含むもの）を篩に通し、篩上に残る粗骨材を回収する方法等が挙げられる。生コンクリートを接触する設備としては、特に限定されず、例えば、アジテータ車のドラム型容器や生コンクリートを製造するミキサ等が挙げられる。また、洗浄廃水を通す篩としては、特に限定されず、例えば、コンベア等の搬送機に付いた篩や、搬送機とは別体の篩等が挙げられる。篩目としては、粗骨材の大きさによって適宜選択することができる。 The method for performing the first recovery step is not particularly limited, and for example, the cleaning wastewater (including ready-mixed concrete) generated when the equipment in contact with the ready-mixed concrete is washed is passed through a sieve, and the coarse aggregate remaining on the sieve is passed. A method of collecting the concrete and the like can be mentioned. The equipment that comes into contact with the ready-mixed concrete is not particularly limited, and examples thereof include a drum-type container for an agitator truck and a mixer for manufacturing the ready-mixed concrete. The sieve through which the washing wastewater is passed is not particularly limited, and examples thereof include a sieve attached to a conveyor such as a conveyor and a sieve separate from the conveyor. The sieve mesh can be appropriately selected depending on the size of the coarse aggregate.
第一実施形態の混合工程では、生コンクリートまたは洗浄廃水（生コンクリートを含むもの）を炭酸水と混合して混合水を形成しているが、第二実施形態では、混合工程は、第一回収工程で回収した粗骨材（以下では、「回収粗骨材」とも記す）を炭酸水と混合することで混合水を形成する。 In the mixing step of the first embodiment, ready-mixed concrete or cleaning wastewater (including ready-mixed concrete) is mixed with carbonated water to form mixed water, but in the second embodiment, the mixing step is the first recovery. Mixed water is formed by mixing the coarse aggregate recovered in the step (hereinafter, also referred to as “recovered coarse aggregate”) with carbonated water.
また、第一実施形態の攪拌洗浄工程は、生コンクリートまたは洗浄廃水（生コンクリートを含むもの）を含む混合水を攪拌することで行うが、第二実施形態では、攪拌洗浄工程は、回収粗骨材を含む混合水を攪拌することで行う。 Further, the stirring and cleaning step of the first embodiment is performed by stirring mixed water containing ready-mixed concrete or cleaning waste water (including ready-mixed concrete), but in the second embodiment, the stirring and cleaning step is a recovered rough bone. This is done by stirring the mixed water containing the material.
また、第一実施形態の静置洗浄工程は、生コンクリートまたは洗浄廃水（生コンクリートを含むもの）を含む混合水を攪拌せずに静置することで行うが、第二実施形態では、静置洗浄工程は、回収粗骨材を含む混合水を攪拌せずに静置することで行う。 Further, the static cleaning step of the first embodiment is performed by allowing the mixed water containing ready-mixed concrete or cleaning wastewater (including ready-mixed concrete) to stand without stirring, but in the second embodiment, it is allowed to stand still. The washing step is performed by allowing the mixed water containing the recovered coarse aggregate to stand without stirring.
また、第一実施形態の排出工程は、生コンクリートまたは洗浄廃水（生コンクリートを含むもの）を含む混合水を混合水容器から排出することで行うが、第二実施形態では、排出工程は、回収粗骨材を含む混合水を混合水容器から排出することで行う。 Further, the discharge step of the first embodiment is performed by discharging mixed water containing ready-mixed concrete or cleaning wastewater (including ready-mixed concrete) from the mixed water container, but in the second embodiment, the discharge step is recovery. This is done by discharging the mixed water containing the coarse aggregate from the mixed water container.
また、第一実施形態の回収工程は、生コンクリートまたは洗浄廃水（生コンクリートを含むもの）を含む混合水から粗骨材を回収することで行うが、第二実施形態では、回収工程（第二回収工程）は、回収粗骨材を含む混合水から回収粗骨材を回収する。 Further, the recovery step of the first embodiment is performed by recovering the coarse aggregate from the mixed water containing ready-mixed concrete or cleaning wastewater (including ready-mixed concrete), but in the second embodiment, the recovery step (second). In the recovery step), the recovered coarse aggregate is recovered from the mixed water containing the recovered coarse aggregate.
以上のように、上記の各本実施形態に係る粗骨材の回収方法および粗骨材用洗浄水によれば、モルタル成分の付着量が比較的少ない粗骨材を回収することができる。 As described above, according to the method for recovering coarse aggregate and the washing water for coarse aggregate according to each of the above-described embodiments, it is possible to recover coarse aggregate having a relatively small amount of mortar component attached.
即ち、生コンクリートまたは生コンクリートから回収した粗骨材を洗浄水と混合して混合水を形成することで粗骨材を洗浄する洗浄工程と、洗浄工程後、混合水から粗骨材を回収する回収工程と、を備えており、洗浄水は、炭酸水から構成されることで、モルタル成分の付着量が比較的少ない粗骨材を回収することができる。 That is, a cleaning step of cleaning the coarse aggregate by mixing the coarse aggregate recovered from the ready-mixed concrete or the ready-mixed concrete with the washing water to form a mixed water, and a cleaning step of cleaning the coarse aggregate, and recovering the coarse aggregate from the mixed water after the washing step. It is provided with a recovery step, and since the washing water is composed of carbonated water, it is possible to recover coarse aggregate having a relatively small amount of mortar component attached.
また、炭酸水の二酸化炭素濃度が上記の範囲であることで、モルタル成分の付着量がより少ない粗骨材を回収することができる。 Further, when the carbon dioxide concentration of the carbonated water is within the above range, it is possible to recover the coarse aggregate having a smaller amount of the mortar component attached.
また、洗浄工程は、生コンクリートまたは生コンクリートから分離した粗骨材を炭酸水と混合して混合水を形成する混合工程と、混合水を攪拌する攪拌洗浄工程および混合水を攪拌せずに静置する静置洗浄工程の少なくとも一方とを備えることで、モルタル成分の付着量が比較的少ない粗骨材を回収することができる。 In addition, the cleaning step includes a mixing step of mixing ready-mixed concrete or coarse aggregate separated from ready-mixed concrete with carbonated water to form mixed water, a stirring washing step of stirring the mixed water, and static without stirring the mixed water. By providing at least one of the static cleaning steps to be placed, it is possible to recover the coarse aggregate having a relatively small amount of the mortar component attached.
また、洗浄工程で使用する炭酸水の体積が上記の範囲であることで、モルタル成分の付着量がより少ない粗骨材を回収することができる。 Further, when the volume of the carbonated water used in the washing step is within the above range, it is possible to recover the coarse aggregate having a smaller amount of the mortar component attached.
なお、本発明に係る粗骨材の回収方法および粗骨材用洗浄水は、上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変更が可能である。また、上記した複数の実施形態の構成や方法等を任意に採用して組み合わせてもよく（１つの実施形態に係る構成や方法等を他の実施形態に係る構成や方法等に適用してもよく）、さらに、他の各種の変更例に係る構成や方法等を任意に選択して、上記した実施形態に係る構成や方法等に採用してもよいことは勿論である。 The method for recovering the coarse aggregate and the washing water for the coarse aggregate according to the present invention are not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention. Further, the configurations and methods of the plurality of embodiments described above may be arbitrarily adopted and combined (the configuration and method of one embodiment may be applied to the configurations and methods of another embodiment). Of course, it is also possible to arbitrarily select a configuration or method according to various other modified examples and adopt the configuration or method according to the above-described embodiment.
以下、本発明の実施例について説明するが、本発明は、下記の実施例に限定されるものではない。 Hereinafter, examples of the present invention will be described, but the present invention is not limited to the following examples.
＜モルタル材料＞
・セメントＣ：普通ポルトランドセメント（住友大阪セメント社製）
・粗骨材Ｇ：茨城県岩瀬町産砕石５～２０ｍｍ
・細骨材Ｓ：静岡県掛川市産山砂５ｍｍ以下
・練り混ぜ水Ｗ：水道水
＜洗浄水＞
・水道水（ＣＯ２濃度：０．０３ｇ／ｌ以下、ｐＨ７．１、水温２０℃）
・上澄水（ＣＯ２濃度：０．０３ｇ／ｌ以下、ｐＨ１３．１、水温２０℃）
・炭酸水１（水道水に炭酸ガスを吹き込んだもの、ＣＯ２濃度：１．７２ｇ／ｌ）
・炭酸水２（炭酸水１を水道水で希釈したもの、ＣＯ２濃度：０．３４ｇ／ｌ）
・炭酸水３（炭酸水１を水道水で希釈したもの、ＣＯ２濃度：０．１７ｇ／ｌ）
・炭酸水４（上澄水に炭酸ガスを吹き込んだもの、ＣＯ２濃度：１．７２ｇ／ｌ）
・炭酸水５（炭酸水４を上澄水で希釈したもの、ＣＯ２濃度：０．３４ｇ／ｌ）
・炭酸水６（炭酸水４を上澄水で希釈したもの、ＣＯ２濃度：０．１７ｇ／ｌ）
<Mortar material>
・ Cement C: Ordinary Portland cement (manufactured by Sumitomo Osaka Cement Co., Ltd.)
・ Coarse aggregate G: 5 to 20 mm of crushed stone from Iwase Town, Ibaraki Prefecture
・ Fine aggregate S: Mountain sand from Kakegawa City, Shizuoka Prefecture 5 mm or less ・ Mixing water W: Tap water <washing water>
-Tap water (CO 2 concentration: 0.03 g / l or less, pH 7.1, water temperature 20 ° C)
-Clear water (CO 2 concentration: 0.03 g / l or less, pH 13.1, water temperature 20 ° C)
・ Carbonated water 1 (Tap water with carbon dioxide gas blown, CO 2 concentration: 1.72 g / l)
-Carbonated water 2 (carbonated water 1 diluted with tap water, CO 2 concentration: 0.34 g / l)
-Carbonated water 3 (carbonated water 1 diluted with tap water, CO 2 concentration: 0.17 g / l)
・ Carbonated water 4 (carbon dioxide gas blown into the supernatant water, CO 2 concentration: 1.72 g / l)
-Carbonated water 5 (carbonated water 4 diluted with supernatant water, CO 2 concentration: 0.34 g / l)
-Carbonated water 6 (carbonated water 4 diluted with supernatant water, CO 2 concentration: 0.17 g / l)
＜生コンクリートの作製＞
下記表１の配合で、生コンクリートを作製した。
<Making ready-mixed concrete>
Ready-mixed concrete was prepared with the formulation shown in Table 1 below.
＜静置洗浄効果の確認＞
（１）上記の生コンクリート２５０ｍｌの質量Ｇ０と、生コンクリートに用いる粗骨材の質量（表乾状態の質量）Ｇ１とを測定した。
（２）１０００ｍｌのプラスティック製の容器に、上記の洗浄水を５００ｍｌ入れた後、生コンクリート２５０ｍｌを容器へ投入し、生コンクリートと洗浄水との混合水を形成して静置した（静置洗浄工程）。静置した時間（洗浄時間）は、下記表２に示す。
（３）その後、混合水を５ｍｍ目の篩に通し、篩の上に残った粗骨材を回収し（回収工程）、回収した粗骨材の質量Ｇ２を測定した。
（４）そして、生コンクリート２５０ｍｌの質量Ｇ０と、生コンクリートの作製に用いた粗骨材の質量Ｇ１と、回収した粗骨材の質量Ｇ２と、下記式（１）とから、生コンクリートを構成する全てのモルタル成分に対する篩を通過したモルタル成分の質量割合（即ち、粗骨材から分離したモルタル成分の割合）を算出し、除去率（％）とした。つまり、粗骨材から除去されて篩を通過したモルタル成分が、多い場合は除去率が高くなり、少ない場合は除去率が低くなる。換言すれば、除去率が高いことは、粗骨材へのモルタル成分の付着量が少ないことを示す。炭酸水の二酸化炭素濃度、上記質量Ｇ０～Ｇ２、および、除去率は、下記表２に示す。なお、炭酸水の二酸化炭素濃度は、島津製作所社製ＴＯＣ計を用い、無機炭素量からＣＯ２量に換算することで求めた。
除去率（％）＝［１－｛（Ｇ２－Ｇ１）／（Ｇ０－Ｇ１）｝］×１００・・・（１）
<Confirmation of static cleaning effect>
(1) The mass G 0 of the above-mentioned 250 ml of ready-mixed concrete and the mass G 1 of the coarse aggregate used for the ready-mixed concrete (mass in a dry state) were measured.
(2) After putting 500 ml of the above-mentioned washing water in a 1000 ml plastic container, 250 ml of ready-mixed concrete was put into the container to form a mixed water of ready-mixed concrete and washing water and allowed to stand (stationary washing). Process). The standing time (washing time) is shown in Table 2 below.
(3) After that, the mixed water was passed through a 5 mm mesh sieve, and the coarse aggregate remaining on the sieve was recovered ( recovery step), and the mass G2 of the recovered coarse aggregate was measured.
(4) Then, from the mass G 0 of 250 ml of ready-mixed concrete, the mass G 1 of the coarse aggregate used for producing the ready-mixed concrete, the mass G 2 of the recovered coarse aggregate, and the following formula (1), raw concrete is used. The mass ratio of the mortar component passed through the sieve to all the mortar components constituting the concrete (that is, the ratio of the mortar component separated from the coarse aggregate) was calculated and used as the removal rate (%). That is, when the amount of the mortar component removed from the coarse aggregate and passed through the sieve is large, the removal rate is high, and when the amount is small, the removal rate is low. In other words, a high removal rate indicates that the amount of the mortar component attached to the coarse aggregate is small. The carbon dioxide concentration of carbonated water, the masses G0 to G2, and the removal rate are shown in Table 2 below. The carbon dioxide concentration of carbonated water was determined by converting the amount of inorganic carbon into the amount of CO 2 using a TOC meter manufactured by Shimadzu Corporation.
Removal rate (%) = [ 1 -{(G2 - G1) /(G0 - G1) } ] × 100 ... (1)
＜攪拌洗浄効果の確認＞
（１）上記の静置洗浄工程と同じ条件で、洗浄水を入れた容器に生コンクリートを投入した。
（２）そして、容器を密閉した状態で、１秒間に３０ｃｍの距離を１往復する速度で容器を往復移動させることで、容器内の混合水を攪拌した（攪拌洗浄工程）。往復運動させた時間（洗浄時間）は、下記表２に示す。
（３）その後、上記の静置洗浄工程と同じ条件で、回収工程を行った。
（４）生コンクリート２５０ｍｌの質量Ｇ０、生コンクリートの作製に用いた粗骨材の質量Ｇ１、および、回収した粗骨材の質量Ｇ２を、上記の静置洗浄工程と同一条件で測定し、上記式（１）から、除去率（％）を算出した。炭酸水の二酸化炭素濃度、上記質量Ｇ０～Ｇ２、および、除去率は、下記表２に示す。
<Confirmation of stirring and cleaning effect>
(1) Under the same conditions as the above-mentioned static washing step, ready-mixed concrete was put into a container containing washing water.
(2) Then, with the container sealed, the mixed water in the container was stirred by reciprocating the container at a speed of reciprocating at a distance of 30 cm per second (stirring and washing step). The time for reciprocating motion (washing time) is shown in Table 2 below.
(3) After that, a recovery step was performed under the same conditions as the above-mentioned static washing step.
(4) The mass G 0 of 250 ml of ready-mixed concrete, the mass G 1 of the coarse aggregate used for producing the ready-mixed concrete, and the mass G 2 of the recovered coarse aggregate were measured under the same conditions as the above-mentioned static cleaning step. Then, the removal rate (%) was calculated from the above formula (1). The carbon dioxide concentration of carbonated water, the masses G0 to G2, and the removal rate are shown in Table 2 below.
＜まとめ＞
上記の表２を見ると、静置洗浄では、各実施例の方が各比較例よりも除去率が高いことが認められる。また、攪拌洗浄では、各実施例と各比較例の洗浄時間が同一のものを比較すると、各実施例の方が除去率が高いことが認められる。つまり、本発明のように、粗骨材の回収において、生コンクリート（具体的には、粗骨材）を炭酸水と混合して洗浄することで、粗骨材からモルタル成分を効果的に除去することができるため、モルタル成分の付着量が比較的少ない粗骨材を回収することができる。
<Summary>
Looking at Table 2 above, it can be seen that in the static washing, the removal rate of each example is higher than that of each comparative example. Further, in the stirring cleaning, when the cleaning times of each example and each comparative example are compared, it is recognized that the removal rate of each example is higher. That is, as in the present invention, in the recovery of coarse aggregate, ready-mixed concrete (specifically, coarse aggregate) is mixed with carbonated water and washed to effectively remove the mortar component from the coarse aggregate. Therefore, it is possible to recover the coarse aggregate having a relatively small amount of the mortar component attached.
Claims (6)
生コンクリートまたは生コンクリートから回収した粗骨材を洗浄水と混合して混合水を形成することで粗骨材を洗浄する洗浄工程と、
洗浄工程後、混合水から粗骨材を回収する回収工程と、
を備えており、
洗浄水は、炭酸水から構成される、
粗骨材の回収方法。 It is a method of recovering coarse aggregate from ready-mixed concrete.
A cleaning process in which coarse aggregate is washed by mixing ready-mixed concrete or coarse aggregate recovered from ready-mixed concrete with washing water to form mixed water.
After the washing process, the recovery process of recovering the coarse aggregate from the mixed water,
Equipped with
The wash water is composed of carbonated water,
How to collect coarse aggregate.
請求項１に記載の粗骨材の回収方法。 Carbonated water has a carbon dioxide concentration of 0.17 g / l to 1.72 g / l.
The method for recovering coarse aggregate according to claim 1.
請求項１または２に記載の粗骨材の回収方法。 The cleaning steps include a mixing step of mixing ready-mixed concrete or coarse aggregate separated from ready-mixed concrete with carbonated water to form mixed water, a stirring cleaning step of stirring the mixed water, and standing the mixed water without stirring. With at least one of the static cleaning steps,
The method for recovering coarse aggregate according to claim 1 or 2.
請求項１～３の何れか一項に記載の粗骨材の回収方法。 The volume of carbonated water used in the cleaning process is 100% or more of the volume of ready-mixed concrete.
The method for recovering coarse aggregate according to any one of claims 1 to 3.
炭酸水から構成される、
粗骨材用洗浄水。 Washing water to be mixed with ready-mixed concrete or coarse aggregate separated from ready-mixed concrete by the method for recovering coarse aggregate according to any one of claims 1 to 4.
Consists of carbonated water,
Washing water for coarse aggregate.
請求項５に記載の粗骨材用洗浄水。 The carbon dioxide concentration is 0.17 g / l to 1.72 g / l.
The washing water for coarse aggregate according to claim 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021096618A JP6994179B1 (en) | 2021-06-09 | 2021-06-09 | How to recover coarse aggregate and wash water for coarse aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021096618A JP6994179B1 (en) | 2021-06-09 | 2021-06-09 | How to recover coarse aggregate and wash water for coarse aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP6994179B1 true JP6994179B1 (en) | 2022-01-14 |
| JP2022188518A JP2022188518A (en) | 2022-12-21 |
Family
ID=80447971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2021096618A Active JP6994179B1 (en) | 2021-06-09 | 2021-06-09 | How to recover coarse aggregate and wash water for coarse aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP6994179B1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001139353A (en) | 1999-11-11 | 2001-05-22 | Taiheiyo Cement Corp | Cement production process involving treatment of ready- mixed concrete sludge through addition of the same concrete sludge to cement raw material |
| KR100714771B1 (en) | 2005-08-26 | 2007-05-07 | 주식회사 그린환경 | A lime element clearing method of revival aggregate make use of liquefaction carbonic acid gas and that equipment and produced revival aggregate |
| JP2007190538A (en) | 2006-01-17 | 2007-08-02 | Takayuki Nomura | Treatment method of ready-mixed concrete using carbon dioxide |
| JP2012000547A (en) | 2010-06-15 | 2012-01-05 | Nippon Telegr & Teleph Corp <Ntt> | Method of treating concrete |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3221908B2 (en) * | 1992-02-28 | 2001-10-22 | 住友大阪セメント株式会社 | Method for producing recycled aggregate and recycled aggregate |
| JPH09168775A (en) * | 1995-12-19 | 1997-06-30 | Yasuo Arai | Method for treating concrete waste material to reutilize the same as resources |
| JPH11319765A (en) * | 1998-05-18 | 1999-11-24 | Kumagai Gumi Co Ltd | Treatment of concrete waste |
-
2021
- 2021-06-09 JP JP2021096618A patent/JP6994179B1/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001139353A (en) | 1999-11-11 | 2001-05-22 | Taiheiyo Cement Corp | Cement production process involving treatment of ready- mixed concrete sludge through addition of the same concrete sludge to cement raw material |
| KR100714771B1 (en) | 2005-08-26 | 2007-05-07 | 주식회사 그린환경 | A lime element clearing method of revival aggregate make use of liquefaction carbonic acid gas and that equipment and produced revival aggregate |
| JP2007190538A (en) | 2006-01-17 | 2007-08-02 | Takayuki Nomura | Treatment method of ready-mixed concrete using carbon dioxide |
| JP2012000547A (en) | 2010-06-15 | 2012-01-05 | Nippon Telegr & Teleph Corp <Ntt> | Method of treating concrete |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022188518A (en) | 2022-12-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2978724B1 (en) | Retrieving aggregates and powdery mineral material from demolition waste | |
| CN102786243B (en) | Modified recycled aggregate and recycled aggregate high-performance concrete | |
| CN104190690B (en) | A kind of method and application that utilizes ammonia-soda process alkaline residue to prepare dechlorination alkaline residue mixture | |
| CN109095865A (en) | A kind of recycled high performance concrete material and preparation method thereof | |
| CN105948545A (en) | Production technology of ecological concrete | |
| Ooi et al. | Treated effluent in concrete technology | |
| CN110922124A (en) | Concrete produced by using waste muddy water | |
| JP6994179B1 (en) | How to recover coarse aggregate and wash water for coarse aggregate | |
| JP6220326B2 (en) | Production method of ready-mixed concrete | |
| CN110698122B (en) | Ecological light filler and preparation method thereof | |
| CN109231898B (en) | Cement mixture and preparation process thereof | |
| JP2006306679A (en) | Method for producing cement-based composition, and cement-based composition | |
| KR101640160B1 (en) | Method for preparing a hardening composition for deep mixing method and hardening composition for deep mixing method | |
| CN109704669A (en) | A kind of method of discarded concrete regeneration | |
| CN113121194B (en) | System and method for preparing building 3D printing material by using urban waste and industrial solid waste | |
| JP6292257B2 (en) | Hydrated solidified product using desulfurized slag | |
| JP2008180076A (en) | Construction method of mortar concrete | |
| JP2011132039A (en) | Fluidizing agent for anti-washout underwater hydraulic composition | |
| JP2022187190A (en) | Washing method of agitator car and washing water for agitator car | |
| CN112225485A (en) | Nucleating agent, copper tailing autoclaved aerated concrete product, preparation method and application | |
| JP2004105783A (en) | Solidification material and solidification method for soil | |
| JPH1158358A (en) | Manufacture of cured material using sludge water | |
| JP4374144B2 (en) | How to reuse hardened cement | |
| NARASAIAH | STRENGTH AND DURABILITY OF CONCRETE BY USING SILICAFUME AND GGBS | |
| Purohit et al. | A pragmatic review paper on the use of recycled aggregates in concrete |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20210623 |
|
| A871 | Explanation of circumstances concerning accelerated examination |
Free format text: JAPANESE INTERMEDIATE CODE: A871 Effective date: 20210628 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20210820 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20211112 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20211125 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 6994179 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |