JP7554020B2 - Semi-flexible paving composition - Google Patents
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Description
本発明は、曲げ強度が高い半たわみ性舗装用組成物に関する。 The present invention relates to a semi-flexible paving composition with high bending strength.
半たわみ性舗装は、開粒度アスファルト混合物の空隙に、セメントミルク（半たわみ性舗装用セメント注入材のスラリー）を充填した舗装である。そして、開粒度アスファルト混合物は、追従性、およびたわみ性が高く、また、セメントミルクの硬化体は剛性が高いため、これらから成る半たわみ性舗装は、アスファルト舗装と比べ、塑性変形抵抗性、および耐用性等に優れる。そして、セメントミルクの水粉体比を小さくすると、セメントミルクの硬化体の曲げ強度が高まり、半たわみ性舗装の塑性変形抵抗性が向上する傾向にある。 Semi-flexible pavement is a pavement in which the voids in the open-graded asphalt mixture are filled with cement milk (slurry of cement injection material for semi-flexible pavement). Open-graded asphalt mixtures have high conformability and flexibility, and the hardened cement milk has high rigidity, so semi-flexible pavement made from these has superior resistance to plastic deformation and durability compared to asphalt pavement. Furthermore, reducing the water-powder ratio of the cement milk increases the bending strength of the hardened cement milk, which tends to improve the plastic deformation resistance of the semi-flexible pavement.
従来、いくつかの半たわみ性舗装材、および半たわみ性舗装用注入材が提案されている。
特許文献１に記載の混合式半たわみ性舗装材は、１００重量部の骨材に対し、３～１５重量部のアスファルトが被着されたアスファルト被着骨材と、前記アスファルト被着骨材の容積比が６０～９０、セメントペーストの容積比が４０～１０となるように配合されたセメントペーストと、添加剤としてのセメント用ポリマーを混合してなる舗装材である。
また、特許文献２に記載の半たわみ性舗装材は、セメント、急硬材、および非再乳化型微粉末弾性ポリマーを含有してなる半たわみ性舗装材であって、急硬材が、カルシウムアルミネートと硫酸塩を含有してなり、セメントと急硬材の合計１００重量部中、１０～２５重量部であり、非再乳化型微粉末弾性ポリマーが、セメントと急硬材の合計１００重量部に対して、２～１０重量部である舗装材である。
また、特許文献３に記載の半たわみ性舗装用注入材は、セメント、炭酸カルシウム粉末、再乳化型粉末樹脂、および減水剤を含有する注入材である。
Several semi-flexible paving materials and injection materials for semi-flexible paving have been proposed in the past.
The mixed type semi-flexible paving material described in Patent Document 1 is a paving material made by mixing asphalt-coated aggregate in which 3 to 15 parts by weight of asphalt is coated per 100 parts by weight of aggregate, cement paste formulated so that the volume ratio of the asphalt-coated aggregate is 60 to 90 and the volume ratio of the cement paste is 40 to 10, and a cement polymer as an additive.
In addition, the semi-flexible paving material described in Patent Document 2 is a semi-flexible paving material containing cement, a hardening agent, and a non-reemulsifiable fine powder elastic polymer, in which the hardening agent contains calcium aluminate and sulfate and is present in an amount of 10 to 25 parts by weight per 100 parts by weight of the cement and the hardening agent combined, and the non-reemulsifiable fine powder elastic polymer is present in an amount of 2 to 10 parts by weight per 100 parts by weight of the cement and the hardening agent combined.
Moreover, the semi-flexible pavement injection material described in Patent Document 3 is an injection material containing cement, calcium carbonate powder, re-emulsifiable powdered resin, and a water-reducing agent.
しかし、従来の半たわみ性舗装は、大型車両の駐停車等の交通荷重が著しく大きい箇所では、劣化が進行し易い。また、セメントミルクの水粉体比を小さくしても、エコセメントを用いたタイプ（表１中のＰ２）のセメントミルクでは、必ずしも、その硬化体の曲げ強度が高くないため（表２中の比較例）、該セメントミルクを用いた半たわみ性舗装材では曲げ強度が十分とは云えない。
ところで、エコセメントは、ポルトランドセメントの原料である石灰石、粘土、および、けい石等の天然原料に代えて、都市ごみ焼却灰や汚泥等の各種廃棄物を用いて製造したセメントであり、これらの廃棄物を資源化して、ごみ処理の負荷等の環境負荷を軽減するという利点があり、環境保護の観点から有益である。したがって、エコセメントを含むセメントミルクの使用量を増やすことができれば、環境負荷の軽減に大いに資すると期待できる。
However, conventional semi-flexible pavements are prone to deterioration in areas with heavy traffic loads such as parking and stopping of large vehicles. In addition, even if the water-powder ratio of cement milk is reduced, the bending strength of the hardened product is not necessarily high in the case of the type of cement milk that uses ecocement (P2 in Table 1) (Comparative Example in Table 2), so the bending strength of the semi-flexible pavement material that uses this cement milk cannot be said to be sufficient.
Ecocement is a cement made from various waste materials such as municipal waste incineration ash and sludge, instead of natural raw materials such as limestone, clay, and silica, which are the raw materials for Portland cement, and has the advantage of reducing the environmental burden, such as the burden of waste disposal, by turning these waste materials into resources, which is beneficial from the perspective of environmental protection. Therefore, if we can increase the amount of cement milk, including ecocement, it is expected to greatly contribute to reducing the environmental burden.
そこで、本発明は、エコセメントを用いても曲げ強度が高い、半たわみ性舗装用組成物を提供することを目的とする。 The present invention aims to provide a semi-flexible paving composition that has high bending strength even when using ecocement.
本発明者らは、前記目的にかなう半たわみ性舗装用組成物を検討したところ、下記の構成を有する半たわみ性舗装用組成物の硬化体は、曲げ強度が高いことを見い出し、本発明を完成させた。すなわち、本発明は、以下の通りである。
［１］半たわみ性舗装用組成物１ｍ
３
に対し３０～５０ｋｇの膨張材、エコセメントを含む半たわみ性舗装用注入材、および、水を、少なくとも含有する、半たわみ性舗装用組成物。
［２］前記半たわみ性舗装用注入材の含有量が、前記半たわみ性舗装用組成物１ｍ３に対し１５００～１９００ｋｇである、前記［１］に記載の半たわみ性舗装用組成物。
［３］前記膨張材が、石灰系膨張材およびカルシウムサルホアルミネート系膨張材から選ばれる１種以上である、前記［１］または［２］に記載の半たわみ性舗装用組成物。
［４］前記水の含有量が、前記半たわみ性舗装用組成物１ｍ３に対し３３０～４６０ｋｇである、前記［１］～［３］のいずれかに記載の半たわみ性舗装用組成物。
The present inventors have investigated semi-flexible paving compositions that meet the above-mentioned objectives, and have found that a cured product of the semi-flexible paving composition having the following composition has high bending strength, thereby completing the present invention.
[1] A semi-flexible paving composition comprising at least 30 to 50 kg of an expanding agent per 1 m3 of the semi-flexible paving composition, a semi-flexible paving injection material containing ecocement , and water.
[2] The semi-flexible paving composition according to [1], wherein the content of the semi-flexible paving injection material is 1,500 to 1,900 kg per 1 m3 of the semi-flexible paving composition.
[3] The semi-flexible paving composition according to [1] or [2] , wherein the expansive material is at least one selected from the group consisting of lime-based expansive materials and calcium sulfoaluminate-based expansive materials.
[4] The semi-flexible paving composition according to any one of [1] to [ 3 ], wherein the water content is 330 to 460 kg per 1 m3 of the semi-flexible paving composition.
本発明の半たわみ性舗装用組成物は、曲げ強度が高い。また、本発明の半たわみ性舗装用組成物は、エコセメントの用途を拡大できるため、環境負荷の低減に寄与できる。 The semi-flexible paving composition of the present invention has high bending strength. In addition, the semi-flexible paving composition of the present invention can expand the applications of ecocement, thereby contributing to reducing the environmental burden.
以下、本発明の半たわみ性舗装用組成物について詳細に説明する。
本発明の半たわみ性舗装用組成物は、前記の通り、膨張材および収縮低減剤から選ばれる１種以上、エコセメントを含む半たわみ性舗装用注入材、並びに、水を、少なくとも含有する、セメント用組成物である。
そして、半たわみ性舗装用注入材中のエコセメントの含有率は、半たわみ性舗装用注入材を１００質量％として、好ましくは１０～５０質量％である。エコセメントの含有率が前記範囲であれば、半たわみ性舗装用組成物の曲げ強度は高い。なお、エコセメントの含有率は、より好ましくは３０～４０質量％である。
The semi-flexible paving composition of the present invention will now be described in detail.
As described above, the semi-flexible paving composition of the present invention is a cement composition containing at least one selected from the group consisting of expansive agents and shrinkage reducing agents, a semi-flexible paving injection material containing ecocement, and water.
The content of ecocement in the semi-flexible paving injection material is preferably 10 to 50% by mass, with the semi-flexible paving injection material being 100% by mass. If the content of ecocement is within the above range, the bending strength of the semi-flexible paving composition is high. The content of ecocement is more preferably 30 to 40% by mass.
また、前記半たわみ性舗装用組成物中の、半たわみ性舗装用注入材の含有量は、半たわみ性舗装用組成物１ｍ３に対し、好ましくは、１５００～１９００ｋｇである。半たわみ性舗装用注入材の含有量が前記範囲にあれば、半たわみ性舗装用組成物の充填性と曲げ強度が高い。なお、半たわみ性舗装用注入材の含有量は、半たわみ性舗装用組成物１ｍ３に対し、より好ましくは１５５０～１８５０ｋｇ、さらに好ましくは１６５０～１８００ｋｇである。
また、前記半たわみ性舗装用注入材は、セメントと石灰石を主成分とし、市販品では、ウルトラパックＨや高強度半たわみ性舗装用セメント注入材－エコセメントタイプ（いずれも、秩父コンクリート工業社製）等がある。
The content of the semi-flexible paving grout in the semi-flexible paving composition is preferably 1500 to 1900 kg per 1 m3 of the semi-flexible paving composition. If the content of the semi-flexible paving grout is within the above range, the semi-flexible paving composition has high filling ability and bending strength. The content of the semi-flexible paving grout is more preferably 1550 to 1850 kg, and even more preferably 1650 to 1800 kg per 1 m3 of the semi-flexible paving composition.
The semi-flexible pavement injection material is mainly composed of cement and limestone, and commercially available products include Ultrapack H and High Strength Semi-Flexible Paving Cement Injection Material - Ecocement Type (both manufactured by Chichibu Concrete Industry Co., Ltd.).
また、膨張材の含有量は、半たわみ性舗装用組成物１ｍ３に対し、好ましくは１０～６０ｋｇである。膨張材の含有量が１０ｋｇ未満では、セメントミルクの膨張が小さいため、セメントミルクの膨張に対する開粒度アスファルト混合物の拘束力が小さく、また、膨張材の含有量が６０ｋｇを超えると、セメントミルクの膨張が大きすぎて、セメントミルクの膨張に対する開粒度アスファルト混合物の拘束力が過大になるため、いずれの場合も、半たわみ性舗装の曲げ強度は小さい。なお、膨張材の含有量は、半たわみ性舗装用組成物１ｍ３に対し、より好ましくは２０～５０ｋｇ、さらに好ましくは２０～４０ｋｇ、特に好ましくは３０～４０ｋｇである。
膨張材は半たわみ性舗装用注入材に対し内割で添加するのが好ましい。内割で添加すれば総粉体量が増加しないため、開粒度アスファルト混合物中への半たわみ性舗装用組成物の充填性は良好である。
前記膨張材は、石灰系膨張材およびカルシウムサルホアルミネート系膨張材が挙げられる。これらの市販品として、石灰系膨張材は太平洋エクスパン（登録商標、太平洋マテリアル社製）等があり、カルシウムサルホアルミネート系膨張材はデンカＣＳＡ（デンカ社製）等がある。
The content of the expansive agent is preferably 10 to 60 kg per 1 m3 of the semi-flexible paving composition. If the content of the expansive agent is less than 10 kg, the expansion of the cement milk is small, so the restraining force of the open-graded asphalt mixture against the expansion of the cement milk is small, and if the content of the expansive agent is more than 60 kg, the expansion of the cement milk is too large, so the restraining force of the open-graded asphalt mixture against the expansion of the cement milk becomes excessive, so in either case, the bending strength of the semi-flexible pavement is small. The content of the expansive agent is more preferably 20 to 50 kg, even more preferably 20 to 40 kg, and particularly preferably 30 to 40 kg per 1 m3 of the semi-flexible paving composition.
It is preferable to add the expansive additive to the semi-flexible paving injection material as a percentage of the total powder content, which ensures good filling of the semi-flexible paving composition into the open-graded asphalt mixture.
The expanding material may be a lime-based expanding material or a calcium sulfoaluminate-based expanding material. Commercially available products of these include Taiheiyo Expan (registered trademark, manufactured by Taiheiyo Materials Co., Ltd.) for lime-based expanding materials and Denka CSA (manufactured by Denka Co., Ltd.) for calcium sulfoaluminate-based expanding materials.
また、前記半たわみ性舗装用組成物中の収縮低減剤の含有量は、半たわみ性舗装用組成物１ｍ３に対し、好ましくは３～１５ｋｇである。収縮低減剤の含有量が前記範囲にあれば、収縮低減によるひび割れの抑制効果が高い。なお。収縮低減剤の含有量は、半たわみ性舗装用組成物１ｍ３に対し、より好ましくは、４～１２ｋｇ、さらに好ましくは、６～９ｋｇである。
前記収縮低減剤は、ポリオキシアルキレンアルキルエーテルを有効成分とし、半たわみ性舗装の乾燥収縮を低減する効果を有する。そして該化合物は、具体的には、ポリエチレングリコールポリプロピレングリコールモノメチルエーテル、ポリエチレングリコールモノメチルエーテル、ポリエチレングリコールポリプロピレングリコールモノエチルエーテル、ポリエチレングリコールモノエチルエーテル、ポリエチレングリコールポリプロピレングリコールモノプロピルエーテル、ポリエチレングリコールモノプロピルエーテル、ポリエチレングリコールポリプロピレングリコールモノブチルエーテル、ポリエチレングリコールモノブチルエーテル等から選ばれる１種以上が挙げられる。
The content of the shrinkage reducing agent in the semi-flexible paving composition is preferably 3 to 15 kg per 1 m3 of the semi-flexible paving composition. If the content of the shrinkage reducing agent is within the above range, the effect of suppressing cracks due to shrinkage reduction is high. The content of the shrinkage reducing agent is more preferably 4 to 12 kg, and even more preferably 6 to 9 kg per 1 m3 of the semi-flexible paving composition.
The shrinkage reducing agent contains polyoxyalkylene alkyl ether as an active ingredient and has the effect of reducing drying shrinkage of semi-flexible pavement. Specific examples of the compound include one or more selected from polyethylene glycol polypropylene glycol monomethyl ether, polyethylene glycol monomethyl ether, polyethylene glycol polypropylene glycol monoethyl ether, polyethylene glycol monoethyl ether, polyethylene glycol polypropylene glycol monopropyl ether, polyethylene glycol monopropyl ether, polyethylene glycol polypropylene glycol monobutyl ether, polyethylene glycol monobutyl ether, etc.
また、前記半たわみ性舗装用組成物中の水の含有量は、半たわみ性舗装用組成物１ｍ３に対し、好ましくは、３３０～４６０ｋｇである。水の含有量が前記範囲にあれば、半たわみ性舗装用組成物の充填性と曲げ強度が高い。なお、水の含有量は、半たわみ性舗装用組成物１ｍ３に対し、より好ましくは、３４０～４１０ｋｇ、さらに好ましくは、３６０～３８０ｋｇである。 The water content in the semi-flexible paving composition is preferably 330 to 460 kg per 1 m3 of the semi-flexible paving composition. If the water content is within the above range, the semi-flexible paving composition has high filling ability and bending strength. The water content is more preferably 340 to 410 kg, and even more preferably 360 to 380 kg per 1 m3 of the semi-flexible paving composition.
以下、本発明を実施例により説明するが、本発明はこれらの実施例に限定されない。
１．セメントミルクの調製とセメントミルクのフロー（流動性）の測定
表１に示す半たわみ性舗装用組成物の各成分を用いて、表２に示す配合に従い、各材料をハンドミキサで練混ぜて、セメントミルクを調製した。
次に、ＪＳＣＥ－Ｆ５２１「プレパックドコンクリートの注入モルタルの流動性試験方法」（Ｐロート法）に準拠して、前記セメントミルクのフローを測定した。表２に示すように、すべての配合のセメントミルクのフローが、目標流下時間である２０～３０秒を満たす。
The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
1. Preparation of cement milk and measurement of flow (fluidity) of cement milk Using each component of the semi-flexible paving composition shown in Table 1, according to the formulation shown in Table 2, each material was mixed with a hand mixer to prepare cement milk.
Next, the flow of the cement milk was measured in accordance with JSCE-F521 "Test method for fluidity of injection mortar for prepacked concrete" (P funnel method). As shown in Table 2, the flow of the cement milk for all the blends met the target flow time of 20 to 30 seconds.
２．セメントミルクの膨張量の測定
縦１０ｃｍ、横１０ｃｍ、長さ４０ｃｍの鋼製型枠の内側にポリエステルフィルムを設置し、フィルムの両端を厚さ１ｍｍ程度のポリスチレンボードと木板で挟み込むとともに、摩擦を軽減させるため、型枠の底面にテフロン（登録商標）シートを設置した。次に、前記型枠に測温機能付き埋め込み型ひずみ計(KM-100BT、東京測器研究所製)を、結束線を用いて固定した後、前記セメントミルクを流し込み、２０℃で封緘養生して、セメントミルクの膨張量を測定した。その結果を表２に示す。
2. Measurement of the amount of expansion of cement milk A polyester film was placed inside a steel formwork measuring 10 cm in length, 10 cm in width, and 40 cm in length, and both ends of the film were sandwiched between a polystyrene board and a wooden board with a thickness of about 1 mm, and a Teflon (registered trademark) sheet was placed on the bottom of the formwork to reduce friction. Next, an embedded type strain gauge with temperature measurement function (KM-100BT, manufactured by Tokyo Measuring Instruments Laboratory) was fixed to the formwork using a cable tie, and the cement milk was poured in and sealed and cured at 20°C, and the amount of expansion of the cement milk was measured. The results are shown in Table 2.
３．供試体の作製と曲げ強度の測定
縦３０ｃｍ、横３０ｃｍ、高さ５ｃｍの型枠内において、設計空隙率が２５％のアスファルト母材を、タンパを用いて締固めた後、該アスファルト母材中に前記セメントミルクを、テーブルバイブレータを用いて浸透させた。次に、材齢１日で脱型した後、２０℃で材齢７日まで湿空養生して硬化体を得た。さらに、該硬化体から、縦１５０ｍｍ、横１００ｍｍ、厚さ５０ｍｍの大きさの供試体を切り出して、供試体を作製した。
次に、東京都の土木材料仕様書に準拠して、前記供試体の曲げ強度を測定した。その結果を表２に示す。
3. Preparation of specimens and measurement of bending strength In a formwork measuring 30 cm in length, 30 cm in width, and 5 cm in height, an asphalt base material with a design void ratio of 25% was compacted using a tamper, and the cement milk was then infiltrated into the asphalt base material using a table vibrator. Next, after demolding at 1 day of age, the material was cured in moist air at 20°C for 7 days to obtain a hardened body. Furthermore, a test specimen measuring 150 mm in length, 100 mm in width, and 50 mm in thickness was cut out from the hardened body to prepare the test specimen.
Next, the bending strength of the test specimens was measured in accordance with the civil engineering material specifications of the Tokyo Metropolitan Government. The results are shown in Table 2.
５．曲げ強度の測定結果について
表２に示すように、エコセメントを含む半たわみ性舗装用注入材を含有する半たわみ性舗装用組成物の曲げ強度は、膨張材および／または収縮低減剤を含有する組成物（実施例１～４２）の方が、膨張材および収縮低減剤を含有しない組成物（比較例）よりも、最大で２倍程度高く、エコセメントを含まない半たわみ性舗装用注入材を含有する半たわみ性舗装用組成物（参考例）の曲げ強度と同程度以上である。
5. Flexural Strength Measurement Results As shown in Table 2, the flexural strength of the semi-flexible paving composition containing the semi-flexible paving injection material containing ecocement is up to about two times higher for the compositions containing the expansive agent and/or shrinkage reducing agent (Examples 1 to 42) than for the composition not containing the expansive agent and shrinkage reducing agent (Comparative Example), and is equal to or greater than the flexural strength of the semi-flexible paving composition containing the semi-flexible paving injection material not containing ecocement (Reference Example).
Claims (4)
4. A semi-flexible paving composition according to claim 1 , wherein the water content is 330 to 460 kg per cubic meter of the semi-flexible paving composition.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002265252A (en) | 2001-03-09 | 2002-09-18 | Taiheiyo Cement Corp | Expansive concrete |
| JP2012233331A (en) | 2011-04-28 | 2012-11-29 | Utsunomiya Univ | Binder for pavement material, pavement material, and application method of the pavement material |
| JP2017124950A (en) | 2016-01-13 | 2017-07-20 | 太平洋マテリアル株式会社 | Concrete and production method of concrete |
| JP2017186238A (en) | 2016-03-31 | 2017-10-12 | 三菱マテリアル株式会社 | Quick-setting mortar composition |
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| JPH10230515A (en) * | 1997-02-21 | 1998-09-02 | Mitsubishi Materials Corp | Grout material manufacturing method |
| JP3341812B2 (en) * | 1997-03-27 | 2002-11-05 | 三菱マテリアル株式会社 | One-powder type polymer cement composition for semi-flexible pavement |
| JPH11228195A (en) * | 1998-02-05 | 1999-08-24 | Taiheiyo Cement Corp | Low shrinkage cement composition |
| JPH11292579A (en) * | 1998-04-06 | 1999-10-26 | Chichibu Concrete Kogyo Kk | Injection material |
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| JP2002265252A (en) | 2001-03-09 | 2002-09-18 | Taiheiyo Cement Corp | Expansive concrete |
| JP2012233331A (en) | 2011-04-28 | 2012-11-29 | Utsunomiya Univ | Binder for pavement material, pavement material, and application method of the pavement material |
| JP2017124950A (en) | 2016-01-13 | 2017-07-20 | 太平洋マテリアル株式会社 | Concrete and production method of concrete |
| JP2017186238A (en) | 2016-03-31 | 2017-10-12 | 三菱マテリアル株式会社 | Quick-setting mortar composition |
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