JP6823551B2 - Roadbed material and its construction method - Google Patents
Roadbed material and its construction method Download PDFInfo
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- JP6823551B2 JP6823551B2 JP2017122805A JP2017122805A JP6823551B2 JP 6823551 B2 JP6823551 B2 JP 6823551B2 JP 2017122805 A JP2017122805 A JP 2017122805A JP 2017122805 A JP2017122805 A JP 2017122805A JP 6823551 B2 JP6823551 B2 JP 6823551B2
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- 239000000463 material Substances 0.000 title claims description 90
- 238000010276 construction Methods 0.000 title claims description 23
- 239000002893 slag Substances 0.000 claims description 89
- 229910000831 Steel Inorganic materials 0.000 claims description 69
- 239000010959 steel Substances 0.000 claims description 69
- 238000006703 hydration reaction Methods 0.000 claims description 44
- 239000002683 reaction inhibitor Substances 0.000 claims description 36
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 27
- 235000000346 sugar Nutrition 0.000 claims description 25
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 18
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 claims description 18
- 150000001735 carboxylic acids Chemical class 0.000 claims description 13
- 239000002699 waste material Substances 0.000 claims description 13
- FERIUCNNQQJTOY-UHFFFAOYSA-N Butyric acid Chemical compound CCCC(O)=O FERIUCNNQQJTOY-UHFFFAOYSA-N 0.000 claims description 12
- RGHNJXZEOKUKBD-SQOUGZDYSA-N D-gluconic acid Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C(O)=O RGHNJXZEOKUKBD-SQOUGZDYSA-N 0.000 claims description 12
- XBDQKXXYIPTUBI-UHFFFAOYSA-N dimethylselenoniopropionate Natural products CCC(O)=O XBDQKXXYIPTUBI-UHFFFAOYSA-N 0.000 claims description 12
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 12
- OWEGMIWEEQEYGQ-UHFFFAOYSA-N 100676-05-9 Natural products OC1C(O)C(O)C(CO)OC1OCC1C(O)C(O)C(O)C(OC2C(OC(O)C(O)C2O)CO)O1 OWEGMIWEEQEYGQ-UHFFFAOYSA-N 0.000 claims description 8
- GUBGYTABKSRVRQ-PICCSMPSSA-N Maltose Natural products O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@@H]1O[C@@H]1[C@@H](CO)OC(O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-PICCSMPSSA-N 0.000 claims description 8
- 229920002125 Sokalan® Polymers 0.000 claims description 8
- GUBGYTABKSRVRQ-QUYVBRFLSA-N beta-maltose Chemical compound OC[C@H]1O[C@H](O[C@H]2[C@H](O)[C@@H](O)[C@H](O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@@H]1O GUBGYTABKSRVRQ-QUYVBRFLSA-N 0.000 claims description 8
- 150000007524 organic acids Chemical class 0.000 claims description 8
- 239000004584 polyacrylic acid Substances 0.000 claims description 8
- 238000004513 sizing Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 235000005985 organic acids Nutrition 0.000 claims description 7
- LUEWUZLMQUOBSB-FSKGGBMCSA-N (2s,3s,4s,5s,6r)-2-[(2r,3s,4r,5r,6s)-6-[(2r,3s,4r,5s,6s)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2r,4r,5s,6r)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol Chemical compound O[C@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@@H](O[C@@H]2[C@H](O[C@@H](OC3[C@H](O[C@@H](O)[C@@H](O)[C@H]3O)CO)[C@@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O LUEWUZLMQUOBSB-FSKGGBMCSA-N 0.000 claims description 6
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 6
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 6
- GUBGYTABKSRVRQ-XLOQQCSPSA-N Alpha-Lactose Chemical compound O[C@@H]1[C@@H](O)[C@@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@H](O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-XLOQQCSPSA-N 0.000 claims description 6
- 229920000945 Amylopectin Polymers 0.000 claims description 6
- 229920000856 Amylose Polymers 0.000 claims description 6
- RGHNJXZEOKUKBD-UHFFFAOYSA-N D-gluconic acid Natural products OCC(O)C(O)C(O)C(O)C(O)=O RGHNJXZEOKUKBD-UHFFFAOYSA-N 0.000 claims description 6
- 239000005715 Fructose Substances 0.000 claims description 6
- 229930091371 Fructose Natural products 0.000 claims description 6
- RFSUNEUAIZKAJO-ARQDHWQXSA-N Fructose Chemical compound OC[C@H]1O[C@](O)(CO)[C@@H](O)[C@@H]1O RFSUNEUAIZKAJO-ARQDHWQXSA-N 0.000 claims description 6
- 229920002581 Glucomannan Polymers 0.000 claims description 6
- 229920002527 Glycogen Polymers 0.000 claims description 6
- 208000007976 Ketosis Diseases 0.000 claims description 6
- GUBGYTABKSRVRQ-QKKXKWKRSA-N Lactose Natural products OC[C@H]1O[C@@H](O[C@H]2[C@H](O)[C@@H](O)C(O)O[C@@H]2CO)[C@H](O)[C@@H](O)[C@H]1O GUBGYTABKSRVRQ-QKKXKWKRSA-N 0.000 claims description 6
- 229920002472 Starch Polymers 0.000 claims description 6
- 235000011054 acetic acid Nutrition 0.000 claims description 6
- 150000001323 aldoses Chemical class 0.000 claims description 6
- 235000015165 citric acid Nutrition 0.000 claims description 6
- 235000019253 formic acid Nutrition 0.000 claims description 6
- 229940046240 glucomannan Drugs 0.000 claims description 6
- 239000000174 gluconic acid Substances 0.000 claims description 6
- 235000012208 gluconic acid Nutrition 0.000 claims description 6
- 229940096919 glycogen Drugs 0.000 claims description 6
- 150000002337 glycosamines Chemical class 0.000 claims description 6
- 150000002584 ketoses Chemical class 0.000 claims description 6
- 150000002596 lactones Chemical class 0.000 claims description 6
- 239000008101 lactose Substances 0.000 claims description 6
- 229920001542 oligosaccharide Polymers 0.000 claims description 6
- 150000002482 oligosaccharides Chemical class 0.000 claims description 6
- 235000006408 oxalic acid Nutrition 0.000 claims description 6
- 229920001277 pectin Polymers 0.000 claims description 6
- 239000001814 pectin Substances 0.000 claims description 6
- 229960000292 pectin Drugs 0.000 claims description 6
- 235000010987 pectin Nutrition 0.000 claims description 6
- 235000019260 propionic acid Nutrition 0.000 claims description 6
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 claims description 6
- 239000008107 starch Substances 0.000 claims description 6
- 235000019698 starch Nutrition 0.000 claims description 6
- 150000005846 sugar alcohols Chemical class 0.000 claims description 6
- 241000207199 Citrus Species 0.000 claims description 5
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 5
- 235000020971 citrus fruits Nutrition 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 5
- 150000008266 deoxy sugars Chemical class 0.000 claims description 5
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- 239000011449 brick Substances 0.000 claims description 2
- 150000001720 carbohydrates Chemical class 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims 1
- 239000001630 malic acid Substances 0.000 claims 1
- 235000011090 malic acid Nutrition 0.000 claims 1
- 229940095064 tartrate Drugs 0.000 claims 1
- 238000000034 method Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 6
- 229930006000 Sucrose Natural products 0.000 description 6
- 239000011384 asphalt concrete Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 229960002160 maltose Drugs 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000005720 sucrose Substances 0.000 description 6
- 239000011398 Portland cement Substances 0.000 description 5
- 150000008163 sugars Chemical class 0.000 description 5
- 229960002737 fructose Drugs 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229960000583 acetic acid Drugs 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 229940013688 formic acid Drugs 0.000 description 3
- 229940095574 propionic acid Drugs 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- -1 malrose Polymers 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 150000001253 acrylic acids Chemical class 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 150000002016 disaccharides Chemical class 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002772 monosaccharides Chemical class 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Landscapes
- Road Paving Structures (AREA)
- Road Repair (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
本発明は、鉄鋼スラグからなる路盤材であって、路盤の硬化強度を低く抑えることができる路盤材とその施工方法に関するものである。 The present invention relates to a roadbed material made of steel slag, which can suppress the hardening strength of the roadbed to a low level, and a construction method thereof.
一般に道路の舗装は、供用開始から一定期間が経過すると、交通輪荷重などの影響により表層のアスファルトコンクリート層に轍・陥没・ひび割れ等が発生し、舗装性能に不具合が生じる。その場合に行われる補修は、舗装の不具合の程度に応じて、アスファルトコンクリート層のみを補修する場合と、下層の路床・路盤を含めた全面的な改修工事（補修工事）を実施する場合がある。 In general, when a certain period of time has passed from the start of service, road pavement causes ruts, depressions, cracks, etc. in the surface asphalt concrete layer due to the influence of traffic wheel load, etc., resulting in problems in pavement performance. In that case, depending on the degree of pavement defect, there are cases where only the asphalt concrete layer is repaired and cases where the entire repair work (repair work) including the lower roadbed and roadbed is carried out. is there.
アスファルトコンクリート層のみを補修する場合には、路面切削機により補修すべきアスファルトコンクリート部を削り取り、新しいアスファルトコンクリートを舗設する。一方、路盤を含めた補修を行う場合には、既設路盤を掘削・撤去し、路床を成形した後に新たな路盤材料を用いて路盤を再構築し、その上に表層のアスファルトコンクリート層を再度舗設する。 When repairing only the asphalt concrete layer, the asphalt concrete part to be repaired is scraped off by a road surface cutting machine and new asphalt concrete is laid. On the other hand, when repairing including the roadbed, the existing roadbed is excavated and removed, the roadbed is formed, the roadbed is reconstructed using a new roadbed material, and the surface asphalt concrete layer is re-applied on it. Pave.
鉄鋼スラグ路盤材は、主原材料となる鉄鋼スラグ（主に高炉系スラグ）を構成する種々の鉱物の化学成分が、土木・建築工事におけるセメントコンクリート施工に用いられるポルトランドセメントの化学成分と似たものとなっている。このため、鉄鋼スラグを道路用路盤材として使用した場合には、施工後の路盤中でポルトランドセメントの水和反応と同様の現象が起こり、舗設直後から路盤材の硬化現象が始まる。その結果、最終的（数年後）には、一般のセメントコンクリートの硬化強度よりは低いものの、圧縮強さで約２０〜５０ｋｇｆ／ｃｍ２程度まで硬化し、路盤全体が盤状に硬化したような状態となる。 Steel slag roadbed materials have chemical components of various minerals that make up steel slag (mainly blast furnace slag), which is the main raw material, similar to the chemical components of Portland cement used for cement concrete construction in civil engineering and construction work. It has become. Therefore, when steel slag is used as a roadbed material for roads, a phenomenon similar to the hydration reaction of Portland cement occurs in the roadbed after construction, and the hardening phenomenon of the roadbed material starts immediately after pavement. As a result, in the end (several years later), although it was lower than the hardening strength of general cement concrete, it was hardened to about 20 to 50 kgf / cm 2 in compressive strength, and the entire roadbed seemed to be hardened like a board. It becomes a state.
鉄鋼スラグ路盤材を使用したことにより盤状に硬化した路盤を補修する場合、路盤を掘削して回収した鉄鋼スラグ路盤材を建設廃材として市中の中間処理場（一般中間処理施設）に搬入し、路盤材として再利用するために解砕（破砕）・整粒し、必要に応じて新たな材料を混合するなどの処理がなされる。 When repairing a roadbed that has hardened into a disc shape due to the use of steel slag roadbed material, the steel slag roadbed material collected by excavating the roadbed is carried into an intermediate treatment plant (general intermediate treatment facility) in the city as construction waste. , It is crushed (crushed) and sized so that it can be reused as a roadbed material, and if necessary, new materials are mixed.
しかし、鉄鋼スラグ路盤材は硬化強度が高いため、中間処理場の破砕機を傷める（例えば、ジョークラッシャーなどの破砕刃の摩耗が早い或いは破砕刃を破損させる）ことが多いことから、受入れを拒否される場合が多い。
このため、鉄鋼スラグ路盤材の硬化強度を低く抑え、路盤から回収した鉄鋼スラグ路盤材（廃材）を解砕されやすい状態で中間処理場に搬入することが、鉄鋼スラグ路盤材の利用を促進するための解決手段の一つになると考えられるが、従来では有効な方法がなかった。
However, since steel slag roadbed materials have high hardening strength, they often damage the crusher at the intermediate treatment plant (for example, the crushing blades such as jaw crushers wear quickly or damage the crushing blades), so acceptance is refused. Often done.
Therefore, keeping the hardening strength of the steel slag roadbed material low and bringing the steel slag roadbed material (waste material) recovered from the roadbed into the intermediate treatment plant in a state where it is easily crushed promotes the use of the steel slag roadbed material. It is considered to be one of the solutions for this, but there has been no effective method in the past.
したがって本発明の目的は、以上のような従来技術の課題を解決し、鉄鋼スラグからなる路盤材であって、路盤の硬化強度を低く抑えることができる路盤材及びその製造方法を提供することにある。また、本発明の他の目的は、既設路盤から回収された既設の鉄鋼スラグ路盤材を再利用する場合において、路盤の硬化強度を低く抑えることができる路盤材の施工方法を提供することにある。 Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a roadbed material made of steel slag, which can suppress the hardening strength of the roadbed to a low level, and a method for manufacturing the roadbed material. is there. Another object of the present invention is to provide a method for constructing a roadbed material capable of suppressing the hardening strength of the roadbed to a low level when the existing steel slag roadbed material recovered from the existing roadbed is reused. ..
本発明者らは、鉄鋼スラグ路盤材で構成される路盤の硬化強度を低く抑えることができる方策について検討を重ねた結果、鉄鋼スラグ路盤材に特定の水和反応抑制剤を添加することにより、路盤強度の発現を効果的に抑制でき、最終硬化強度を低く抑えることができることを見出した。 As a result of repeated studies on measures that can suppress the hardening strength of the roadbed composed of the steel slag roadbed material to a low level, the present inventors have added a specific hydration reaction inhibitor to the steel slag roadbed material. It has been found that the development of roadbed strength can be effectively suppressed and the final curing strength can be suppressed low.
本発明はこのような知見に基づきなされたもので、以下を要旨とするものである。
［1］一部又は全部が鉄鋼スラグからなる路盤材であって、糖類、カルボン酸、カルボン酸以外の有機酸の中から選ばれる１種以上からなる水和反応抑制剤を含むことを特徴とする路盤材。
［2］上記［1］の路盤材において、水和反応抑制剤が、アルドース、ケトース、マルトース、ラクトース、蔗糖、砂糖、オリゴ糖、デオキシ糖、ウロン糖、アミノ糖、糖アルコール、ラクトン、でんぷん、アミロース、アミロペクチン、マルロース、グリコーゲン、ペクチン、グルコマンナン、フルクトース、ギ酸、酢酸、プロピオン酸、酪酸、しゅう酸、グルコン酸、クエン酸、酒石酸、りんご酸、オキシカルボン酸、ポリアクリル酸の中から選ばれる１種以上であることを特徴する路盤材。
The present invention has been made based on such findings, and the gist of the present invention is as follows.
[1] A roadbed material partially or wholly made of steel slag, which is characterized by containing a hydration reaction inhibitor composed of one or more selected from sugars, carboxylic acids, and organic acids other than carboxylic acids. Roadbed material to be used.
[2] In the roadbed material of the above [1], the hydration reaction inhibitor is aldose, ketose, maltose, lactose, citrus sugar, sugar, oligosaccharide, deoxy sugar, urone sugar, amino sugar, sugar alcohol, lactone, starch, Selected from amylose, amylopectin, malrose, glycogen, pectin, glucomannan, fructose, formic acid, acetic acid, propionic acid, butyric acid, oxalic acid, gluconic acid, citric acid, tartaric acid, apple acid, oxycarboxylic acid and polyacrylic acid. Roadbed material characterized by being one or more types.
［3］鉄鋼スラグからなる路盤材の製造方法であって、鉄鋼スラグに糖類、カルボン酸、カルボン酸以外の有機酸の中から選ばれる１種以上からなる水和反応抑制剤を添加・混合することを特徴とする路盤材の製造方法。
［4］上記［3］の製造方法において、水和反応抑制剤が、アルドース、ケトース、マルトース、ラクトース、蔗糖、砂糖、オリゴ糖、デオキシ糖、ウロン糖、アミノ糖、糖アルコール、ラクトン、でんぷん、アミロース、アミロペクチン、マルロース、グリコーゲン、ペクチン、グルコマンナン、フルクトース、ギ酸、酢酸、プロピオン酸、酪酸、しゅう酸、グルコン酸、クエン酸、酒石酸、りんご酸、オキシカルボン酸、ポリアクリル酸の中から選ばれる１種以上であることを特徴する路盤材の製造方法。
[3] A method for producing a roadbed material made of steel slag, in which a hydration reaction inhibitor consisting of one or more selected from sugars, carboxylic acids, and organic acids other than carboxylic acids is added and mixed with the steel slag. A method for manufacturing a roadbed material, which is characterized in that.
[4] In the production method of the above [3], the hydration reaction inhibitor is aldose, ketose, maltose, lactose, citrus sugar, sugar, oligosaccharide, deoxy sugar, urone sugar, amino sugar, sugar alcohol, lactone, starch, Selected from amylose, amylopectin, malrose, glycogen, pectin, glucomannan, fructose, formic acid, acetic acid, propionic acid, butyric acid, oxalic acid, gluconic acid, citric acid, tartaric acid, apple acid, oxycarboxylic acid and polyacrylic acid. A method for manufacturing a roadbed material, which is characterized by having one or more types.
［5］既設路盤を掘削して既設の鉄鋼スラグ路盤材を回収し、該鉄鋼スラグ路盤材を解砕・整粒した後、路盤材として再利用する際に、前記解砕・整粒した鉄鋼スラグ路盤材に、糖類、カルボン酸、カルボン酸以外の有機酸の中から選ばれる１種以上からなる水和反応抑制剤を添加・混合することを特徴とする路盤材の施工方法。
［6］上記［5］の施工方法において、既設路盤を掘削して回収した既設の鉄鋼スラグ路盤材を、当該現場にて解砕・整粒した後、水和反応抑制剤を添加・混合し、この鉄鋼スラグ路盤材を当該現場又は他の現場にて再利用することを特徴とする路盤材の施工方法。
[5] When the existing roadbed is excavated to recover the existing steel slag roadbed material, the steel slag roadbed material is crushed and sized, and then reused as the roadbed material, the crushed and sized steel A method for constructing a roadbed material, which comprises adding and mixing a hydration reaction inhibitor composed of one or more selected from sugars, carboxylic acids, and organic acids other than carboxylic acids to the slag roadbed material.
[6] In the construction method of [5] above, the existing steel slag roadbed material recovered by excavating the existing roadbed is crushed and sized at the site, and then a hydration reaction inhibitor is added and mixed. , A method of constructing a roadbed material, which comprises reusing this steel slag roadbed material at the site or another site.
［7］上記［5］の施工方法において、既設路盤を掘削して回収した既設の鉄鋼スラグ路盤材を、建設廃材として搬入された中間処理場にて解砕・整粒した後、水和反応抑制剤を添加・混合することを特徴とする路盤材の施工方法。
［8］上記［5］〜［7］のいずれかの施工方法において、水和反応抑制剤が、アルドース、ケトース、マルトース、ラクトース、蔗糖、砂糖、オリゴ糖、デオキシ糖、ウロン糖、アミノ糖、糖アルコール、ラクトン、でんぷん、アミロース、アミロペクチン、マルロース、グリコーゲン、ペクチン、グルコマンナン、フルクトース、ギ酸、酢酸、プロピオン酸、酪酸、しゅう酸、グルコン酸、クエン酸、酒石酸、りんご酸、オキシカルボン酸、ポリアクリル酸の中から選ばれる１種以上であることを特徴する路盤材の施工方法。
[7] In the construction method of [5] above, the existing steel slag roadbed material collected by excavating the existing roadbed is crushed and sized at the intermediate treatment plant brought in as construction waste, and then hydrated. A roadbed material construction method characterized by adding and mixing an inhibitor.
[8] In any of the above [5] to [7], the hydration reaction inhibitor is aldose, ketose, maltose, lactose, citrus sugar, sugar, oligosaccharide, deoxy sugar, uron sugar, amino sugar, Sugar alcohol, lactone, starch, amylose, amylopectin, mallose, glycogen, pectin, glucomannan, fructose, formic acid, acetic acid, propionic acid, butyric acid, oxalic acid, gluconic acid, citric acid, maltose, apple acid, oxycarboxylic acid, poly A method of constructing a roadbed material, which is characterized by being one or more selected from acrylic acids.
本発明の路盤材は、鉄鋼スラグ路盤材でありながら、施工してから長期間経過した後も路盤の硬化強度を低く抑えることができる。このため、路盤補修時に回収した鉄鋼スラグ路盤材（廃材）を再利用する際に、解砕・整粒などの作業が容易になり、この作業を中間処分場で行うような場合に、受入れの拒否を免れることができる。これにより施工後長期間経過した後に回収された鉄鋼スラグ路盤材を産業廃棄物として処分することなく、リサイクルすることが容易になり、鉄鋼スラグ路盤材の施工コストを大幅に削減することができる。 Although the roadbed material of the present invention is a steel slag roadbed material, the hardening strength of the roadbed can be kept low even after a long period of time has passed since the construction. For this reason, when reusing the steel slag roadbed material (waste material) collected during roadbed repair, work such as crushing and sizing becomes easy, and when this work is performed at an intermediate disposal site, it is accepted. You can avoid refusal. As a result, the steel slag roadbed material collected after a long period of time has passed can be easily recycled without being disposed of as industrial waste, and the construction cost of the steel slag roadbed material can be significantly reduced.
鉄鋼スラグ路盤材は、主原材料となる鉄鋼スラグを構成する種々の鉱物の化学成分が、土木・建築工事におけるセメントコンクリート施工に用いられるポルトランドセメントの化学成分と似たものとなっている。このため、鉄鋼スラグを道路用路盤材として使用した場合には、施工後の路盤中でポルトランドセメントの水和反応と同様の現象が起こり、舗設直後から路盤材の硬化現象が始まる。その結果、最終的（数年後）には、路盤全体が盤状に硬化したような状態となる。 In steel slag roadbed materials, the chemical components of various minerals that make up steel slag, which is the main raw material, are similar to the chemical components of Portland cement used for cement concrete construction in civil engineering and construction work. Therefore, when steel slag is used as a roadbed material for roads, a phenomenon similar to the hydration reaction of Portland cement occurs in the roadbed after construction, and the hardening phenomenon of the roadbed material starts immediately after pavement. As a result, in the end (several years later), the entire roadbed becomes like a board.
本発明の路盤材は、一部又は全部が鉄鋼スラグからなる路盤材であって、糖類、カルボン酸、カルボン酸以外の有機酸の中から選ばれる１種以上からなる水和反応抑制剤を含むものであり、これにより長期に亘る鉄鋼スラグの水和反応が抑制されることで路盤強度の発現（路盤硬化）が抑制される。
路盤材となる鉄鋼スラグは、鉄鋼製造プロセスで発生するスラグであり、高炉スラグ（高炉徐冷スラグなど）、溶銑予備処理スラグ（脱燐スラグ、脱珪スラグなど）、転炉脱炭スラグ、溶融還元スラグなどが挙げられ、これらの１種以上を用いることができる。また、一部が鉄鋼スラグである路盤材の場合、路盤材の残部として、コンクリート廃材、廃路盤材、レンガ廃材、鉄鋼スラグ以外のスラグ（例えば、ごみ溶融スラグなど）、砕石などの１種以上を含むことができる。
The roadbed material of the present invention is a roadbed material partially or wholly made of steel slag, and contains a hydration reaction inhibitor composed of one or more selected from sugars, carboxylic acids, and organic acids other than carboxylic acids. This suppresses the hydration reaction of steel slag over a long period of time, thereby suppressing the development of roadbed strength (roadbed hardening).
Steel slag used as roadbed material is slag generated in the steel manufacturing process, such as blast furnace slag (blast furnace slow cooling slag, etc.), hot metal pretreatment slag (dephosphorization slag, desiliconization slag, etc.), converter decarburization slag, and melting. Examples thereof include reduced slag, and one or more of these can be used. In the case of roadbed material whose part is steel slag, one or more types of roadbed material such as concrete waste material, waste roadbed material, brick waste material, slag other than steel slag (for example, waste molten slag), crushed stone, etc. Can be included.
水和反応抑制剤として用いられる糖類は、単糖類、二糖類、多糖類などを問わず適用でき、例えば、アルドース、ケトース、マルトース、ラクトース、蔗糖（スクロース）、砂糖、オリゴ糖、デオキシ糖、ウロン糖、アミノ糖、糖アルコール、ラクトン、でんぷん、アミロース、アミロペクチン、マルロース、グリコーゲン、ペクチン、グルコマンナン、フルクトースなどが挙げられる。
水和反応抑制剤として用いられる有機酸（カルボン酸）としては、ギ酸、酢酸、プロピオン酸、酪酸、しゅう酸、グルコン酸、クエン酸、酒石酸、りんご酸、オキシカルボン酸、ポリアクリル酸などが挙げられる。
The saccharide used as a hydration reaction inhibitor can be applied to any monosaccharide, disaccharide, polysaccharide, etc., for example, aldose, ketose, maltose, lactose, sucrose, sugar, oligosaccharide, deoxysaccharide, urone. Examples thereof include sugar, amino sugar, sugar alcohol, lactone, starch, amylose, amylopectin, maltose, glycogen, pectin, glucomannan and fructose.
Examples of the organic acid (carboxylic acid) used as a hydration reaction inhibitor include formic acid, acetic acid, propionic acid, butyric acid, oxalic acid, gluconic acid, citric acid, tartaric acid, apple acid, oxycarboxylic acid, and polyacrylic acid. Be done.
以上のような糖類、有機酸の中から選ばれる１種を単独で又は２種以上を混合して使用することができる。なお、施工コストを考えると水和反応抑制剤は安価であることが重要であり、このため、上記のなかでも工業用の蔗糖や砂糖が特に好ましい。
本発明の路盤材は、水和反応抑制剤がスラグ粒子の表面に付着し、或いはスラグ粒子の内部に浸透した状態で含まれるのが好ましいが、スラグ粒子から分離した状態で含まれる水和反応抑制剤（粉末）であっても、その多くは路盤材が施工された状態ではスラグ粒子と接触することになるので、所望の水和反応の抑制効果が得られることになる。
One kind selected from the above-mentioned sugars and organic acids can be used alone or in combination of two or more kinds. Considering the construction cost, it is important that the hydration reaction inhibitor is inexpensive, and therefore, among the above, industrial sucrose and sugar are particularly preferable.
The roadbed material of the present invention is preferably contained in a state where the hydration reaction inhibitor is attached to the surface of the slag particles or permeates the inside of the slag particles, but the hydration reaction contained in a state of being separated from the slag particles. Most of the inhibitors (powder) come into contact with the slag particles in the state where the roadbed material is applied, so that the desired effect of suppressing the hydration reaction can be obtained.
本発明の路盤材（鉄鋼スラグ路盤材）は、鉄鋼スラグに上記水和反応抑制剤を添加・混合することにより製造することができる。鉄鋼スラグ路盤材にはスラグの種類や粒度に応じてＭＳ、ＣＳ、ＲＭ、ＲＣ、ＨＭＳなどの呼び名があり、一般に工場において鉄鋼スラグを加工することで製造されるが、この製造工程で水和反応抑制剤を添加・混合する。この場合、粉末又は液状の水和反応抑制剤を鉄鋼スラグに添加（散布）・混合するが、粉末の水和反応抑制剤を添加（散布）する場合には、必要に応じて鉄鋼スラグに水分を添加することが好ましい。これにより、水和反応抑制剤が鉄鋼スラグと混ざり合いやすくなり、より高い水和抑制効果が期待できる。水和反応抑制剤を添加（散布）後はバックホーやブレンダー、スタビライザーなどを用い鉄鋼スラグと水和反応抑制剤を混合する。 The roadbed material (steel slag roadbed material) of the present invention can be produced by adding and mixing the above-mentioned hydration reaction inhibitor to steel slag. Steel slag roadbed materials have names such as MS, CS, RM, RC, and HMS depending on the type and particle size of the slag. Generally, they are manufactured by processing steel slag in a factory, but hydration is performed in this manufacturing process. Add and mix the reaction inhibitor. In this case, a powdered or liquid hydration reaction inhibitor is added (sprayed) and mixed with the steel slag, but when a powdered hydration reaction inhibitor is added (sprayed), water is added to the steel slag as necessary. Is preferably added. As a result, the hydration reaction inhibitor is easily mixed with the steel slag, and a higher hydration inhibitory effect can be expected. After adding (spraying) the hydration reaction inhibitor, the steel slag and the hydration reaction inhibitor are mixed using a backhoe, blender, stabilizer, or the like.
水和反応抑制剤の添加量に特別な制限はなく、使用する水和反応抑制剤の種類や鉄鋼スラグの種類などに応じて最適な添加量とすればよいが、一般的にはスラグ量の０．５質量％以上の添加量（有効成分量）することが好ましい。一方、添加量が多くなるとコストが高くなり、また、強度が著しく低下する可能性もあるので、一般にはスラグ量の２質量％程度を上限として添加するのが適当である。なお、蔗糖や砂糖の場合には１質量％未満でも十分な効果が期待できる。 There is no particular limitation on the amount of hydration reaction inhibitor added, and the optimum amount may be added according to the type of hydration reaction inhibitor used, the type of steel slag, etc., but in general, the amount of slag It is preferable to add 0.5% by mass or more (active ingredient amount). On the other hand, if the amount of slag added is large, the cost will increase and the strength may be significantly reduced. Therefore, it is generally appropriate to add the slag amount up to about 2% by mass. In the case of sucrose or sugar, a sufficient effect can be expected even if it is less than 1% by mass.
また、本発明の路盤材の施工方法では、経年劣化した路盤の補修工事などにおいて、既設路盤を掘削して既設の鉄鋼スラグ路盤材を回収し、この鉄鋼スラグ路盤材を解砕・整粒した後、路盤材として再利用する際に、前記解砕・整粒した鉄鋼スラグ路盤材に上記水和反応抑制剤を添加・混合する。
回収した鉄鋼スラグ路盤材の解砕・整粒は、路盤材として再利用する際に路盤として耐え得る支持力を保持するために必要であり、例えば、解砕はブレーカー等で行い、整粒はクラッシャー等で粉砕して行う。
Further, in the construction method of the roadbed material of the present invention, in the repair work of the roadbed that has deteriorated over time, the existing roadbed is excavated to recover the existing steel slag roadbed material, and the steel slag roadbed material is crushed and sized. Later, when the roadbed material is reused, the hydration reaction inhibitor is added and mixed with the crushed and sized steel slag roadbed material.
Crushing and sizing of the recovered steel slag roadbed material is necessary to maintain the bearing capacity that can withstand the roadbed when reused as the roadbed material. For example, crushing is performed with a breaker or the like, and sizing is performed. Crush with a crusher or the like.
この場合、回収した鉄鋼スラグ路盤材の解砕・整粒と水和反応抑制剤の添加・混合は、現場で行ってもよいし、中間処理場で行ってもよい。
前者の場合には、既設路盤を掘削して回収した既設の鉄鋼スラグ路盤材を、当該現場にて解砕・整粒した後、水和反応抑制剤を添加・混合し、この鉄鋼スラグ路盤材を当該現場又は他の現場にて再利用する。回収した鉄鋼スラグ路盤材を現場で解砕・整粒するには、例えば、ブレーカーで解砕した後に、バケットタイプのクラッシャーなどで粉砕して整粒する。
また、後者の場合には、既設路盤を掘削して回収した既設の鉄鋼スラグ路盤材を建設廃材として中間処理場に搬入し、この中間処理場にて鉄鋼スラグ路盤材を解砕・整粒した後、水和反応抑制剤を添加・混合する。
In this case, the recovered steel slag roadbed material may be crushed / sized and the hydration reaction inhibitor may be added / mixed at the site or at an intermediate treatment plant.
In the former case, the existing steel slag roadbed material collected by excavating the existing roadbed is crushed and sized at the site, and then a hydration reaction inhibitor is added and mixed, and this steel slag roadbed material is added. Will be reused at the site or another site. In order to crush and sizing the recovered steel slag roadbed material on site, for example, after crushing with a breaker, crushing with a bucket type crusher or the like and sizing.
In the latter case, the existing steel slag roadbed material collected by excavating the existing roadbed was carried into the intermediate treatment plant as construction waste, and the steel slag roadbed material was crushed and sized at this intermediate treatment plant. After that, a hydration reaction inhibitor is added and mixed.
路盤を舗設する工事において、本発明の路盤材を用いることにより或いは本発明の施工方法を用いることにより、施工後の路盤中でポルトランドセメントの水和反応と同様の路盤材の硬化現象が始まっても、最終的な硬化強度を低く抑えることができる。このため、路盤補修時に回収した鉄鋼スラグ路盤材（廃材）を再利用する際に、解砕・整粒などの作業が容易になり、この作業を中間処分場でも容易に行うことができる。 By using the roadbed material of the present invention or by using the construction method of the present invention in the construction of paving the roadbed, a hardening phenomenon of the roadbed material similar to the hydration reaction of Portland cement begins in the roadbed after the construction. However, the final curing strength can be kept low. Therefore, when the steel slag roadbed material (waste material) collected at the time of roadbed repair is reused, the work such as crushing and sizing becomes easy, and this work can be easily performed even at the intermediate disposal site.
・比較例
鉄鋼スラグ路盤材を施工すると水和反応を起こし、一軸圧縮強度が著しく大きくなる傾向があり、この強度は期間が長くなるほど大きくなる。鉄鋼スラグ路盤材（水硬性粒度調整鉄鋼スラグ）について、ＪＩＳ Ａ５０１５付属書Ｃの一軸圧縮強度試験に準拠した強度試験を実施した。その結果を表１に示す。これによれば、鉄鋼スラグ路盤材の一軸圧縮強度は養生期間が長くなるほど大きくなり、ＪＩＳの基準では１４日で１．２Ｎ／ｍｍ２であるが、３ヵ月程度養生するとその３倍以上となる。
-Comparative example When steel slag roadbed material is constructed, a hydration reaction occurs and the uniaxial compressive strength tends to increase remarkably, and this strength increases as the period becomes longer. A strength test was carried out on a steel slag roadbed material (hydraulic particle size adjusted steel slag) in accordance with the uniaxial compressive strength test of JIS A5015 Annex C. The results are shown in Table 1. According to this, the uniaxial compressive strength of steel slag roadbed material increases as the curing period becomes longer, and it is 1.2 N / mm 2 in 14 days according to JIS standards, but it becomes more than 3 times that after curing for about 3 months. ..
・実施例１（発明例１〜３）
比較例と同じ鉄鋼スラグ路盤材に対して、水和反応抑制剤として所定量のショ糖を添加して養生し、比較例と同様の強度試験を実施した。本実施例では、ショ糖を所定量添加した後に最適含水比となるように水分を調整し、均一に混ざるように袋に入れて混合した。その結果を表２に示す。これによれば、水和反応抑制剤（ショ糖）を添加することで、どの養生期間においても一軸圧縮強度が低く抑えられている。このように強度発現が抑えられることにより、再利用の際の解砕・整粒の負荷も少なくなり、より一層の鉄鋼スラグ路盤材の使用が見込めることになる。
Example 1 (Invention Examples 1 to 3)
A predetermined amount of sucrose was added as a hydration reaction inhibitor to the same steel slag roadbed material as in the comparative example and cured, and the same strength test as in the comparative example was carried out. In this example, after adding a predetermined amount of sucrose, the water content was adjusted so as to have an optimum water content ratio, and the mixture was placed in a bag and mixed so as to be uniformly mixed. The results are shown in Table 2. According to this, by adding a hydration reaction inhibitor (sucrose), the uniaxial compressive strength is suppressed to a low level during any curing period. By suppressing the development of strength in this way, the load of crushing and sizing at the time of reuse is reduced, and further use of steel slag roadbed material can be expected.
・実施例２（発明例４〜６）
比較例と同じ鉄鋼スラグ路盤材に対して、水和反応抑制剤として所定量のクエン酸を添加して養生し、比較例と同様の強度試験を実施した。本実施例では、クエン酸を所定量添加した後に最適含水比となるように水分を調整し、均一に混ざるように袋に入れて混合した。その結果を表３に示す。これによれば、水和反応抑制剤（クエン酸）を添加することで、どの養生期間においても一軸圧縮強度が低く抑えられている。
Example 2 (Invention Examples 4 to 6)
The same steel slag roadbed material as in Comparative Example was cured by adding a predetermined amount of citric acid as a hydration reaction inhibitor, and the same strength test as in Comparative Example was carried out. In this example, after adding a predetermined amount of citric acid, the water content was adjusted so as to have an optimum water content ratio, and the mixture was placed in a bag and mixed so as to be uniformly mixed. The results are shown in Table 3. According to this, by adding a hydration reaction inhibitor (citric acid), the uniaxial compressive strength is suppressed to a low level during any curing period.
・実施例３（発明例７〜９）
比較例と同じ鉄鋼スラグ路盤材に対して、水和反応抑制剤として所定量のポリアクリル酸を添加して養生し、比較例と同様の強度試験を実施した。本実施例では、ポリアクリル酸を所定量添加した後に最適含水比となるように水分を調整し、均一に混ざるように袋に入れて混合した。その結果を表４に示す。これによれば、水和反応抑制剤（ポリアクリル酸）を添加することで、どの養生期間においても一軸圧縮強度が低く抑えられている。
Example 3 (Invention Examples 7 to 9)
The same steel slag roadbed material as in Comparative Example was cured by adding a predetermined amount of polyacrylic acid as a hydration reaction inhibitor, and the same strength test as in Comparative Example was carried out. In this example, after adding a predetermined amount of polyacrylic acid, the water content was adjusted so as to have an optimum water content ratio, and the mixture was placed in a bag and mixed so as to be uniformly mixed. The results are shown in Table 4. According to this, by adding a hydration reaction inhibitor (polyacrylic acid), the uniaxial compressive strength is suppressed to a low level during any curing period.
Claims (4)
前記解砕・整粒した鉄鋼スラグ路盤材に、糖類、カルボン酸、カルボン酸以外の有機酸の中から選ばれる１種以上からなる水和反応抑制剤を添加・混合することを特徴とする路盤材の施工方法。 When excavating an existing roadbed to recover the existing steel slag roadbed material, crushing and sizing the steel slag roadbed material at the site , and then reusing it as the roadbed material at the site.
A roadbed characterized by adding and mixing a hydration reaction inhibitor composed of one or more selected from organic acids other than saccharides, carboxylic acids, and carboxylic acids to the crushed and sized steel slag roadbed material. Material construction method.
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