JP6532163B2 - Simple pavement method - Google Patents
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- JP6532163B2 JP6532163B2 JP2015173589A JP2015173589A JP6532163B2 JP 6532163 B2 JP6532163 B2 JP 6532163B2 JP 2015173589 A JP2015173589 A JP 2015173589A JP 2015173589 A JP2015173589 A JP 2015173589A JP 6532163 B2 JP6532163 B2 JP 6532163B2
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- 238000000034 method Methods 0.000 title claims description 21
- 239000000463 material Substances 0.000 claims description 104
- 239000002893 slag Substances 0.000 claims description 57
- 239000002002 slurry Substances 0.000 claims description 41
- 238000009628 steelmaking Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 239000011400 blast furnace cement Substances 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 239000011398 Portland cement Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 description 10
- 239000004568 cement Substances 0.000 description 8
- 239000010426 asphalt Substances 0.000 description 7
- 239000002245 particle Substances 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 238000007596 consolidation process Methods 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000005056 compaction Methods 0.000 description 4
- 230000035515 penetration Effects 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000003513 alkali Substances 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
- 239000011230 binding agent Substances 0.000 description 1
- JLDKGEDPBONMDR-UHFFFAOYSA-N calcium;dioxido(oxo)silane;hydrate Chemical compound O.[Ca+2].[O-][Si]([O-])=O JLDKGEDPBONMDR-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Landscapes
- Road Paving Structures (AREA)
Description
この発明は、簡易舗装方法に関し、詳しくは、アスファルト舗装をかけずに、高炉水砕スラグと製鋼スラグとの混合材を用いて簡易舗装する簡易舗装方法に関するものである。 The present invention relates to a simple paving method, and more particularly, to a simple paving method using a mixture of ground granulated blast furnace slag and steelmaking slag without applying asphalt paving.
道路の舗装として、一般には、多量のエネルギーを活用して製造されるコンクリートやアスファルトを用いたものが広く普及している。しかしながら、これらはいわゆる高級資材であり、例えば、車両通行量の少ない（強度を求めない）道路や歩道、管理道等では、ぬかるまないようにする目的などから安価で施工が簡便な簡易舗装が求められる。 As pavements for roads, generally, those using concrete or asphalt manufactured using a large amount of energy are widely used. However, these are so-called high-grade materials. For example, on roads, sidewalks, administrative roads, etc. where traffic is small (does not require strength), simple paving is inexpensive and easy to install, for the purpose of preventing muddy. Desired.
そこで、高炉水砕スラグと製鋼スラグとの混合材を敷き均し、散水転圧施工によって簡易舗装する方法が知られている（非特許文献１参照）。鉄鋼スラグである高炉水砕スラグや製鋼スラグは、酸化カルシウム、けい酸カルシウム、酸化鉄（II）、アルミナ等を主成分とする複合材料であって潜在水硬性を有し、製鋼スラグ単体でも弱い水硬性があり強度発現するが、製鋼スラグに高炉水砕スラグを配合すると、強アルカリである製鋼スラグが更に強い水硬性を有する高炉水砕スラグを刺激し、水和物が生成して強度の高い簡易舗装材になる。そして、このような簡易舗装材の水硬性を促進させるために水を散布し、転圧機で転圧して締め固めることで簡易舗装体を得ることができ、しかも、この簡易舗装体からの高アルカリ水の排出を防ぐことができる。 Therefore, a method is known in which a mixture of blast furnace granulated slag and steelmaking slag is spread and leveled, and simple paving is carried out by water spray rolling (see Non-Patent Document 1). Granulated blast-furnace slag and steelmaking slag, which are steel slags, are composite materials containing calcium oxide, calcium silicate, iron (II) oxide, alumina, etc. as their main components, have latent hydraulic properties, and are weak even with steelmaking slag alone When the blast furnace granulated slag is compounded with steelmaking slag, although it has hydraulic property and strength is developed, the steelmaking slag which is a strong alkali further stimulates the blast furnace granulated slag having strong hydraulicity, and hydrates are formed to be strong. It becomes a high simple paving material. And in order to promote the hydraulic property of such a simple pavement material, it is possible to obtain a simple pavement body by dispersing water by compaction and compacting with a roller compactor, and furthermore, high alkalinity from this simple pavement body It can prevent the discharge of water.
このような簡易舗装について、より強度を増した高品質なものとするために、更に、ポルトランドセメント、高炉セメント、高炉水砕微粉末（高炉スラグ微粉末）のうち１種又は２種以上を所定量混合した簡易舗装材が提案されている（特許文献１参照）。すなわち、高炉水砕スラグや製鋼スラグのほかに、結合材としてポルトランドセメント、高炉セメント、高炉水砕微粉末の１種又は２種以上を混合することで、カルシウムシリケイト水和物（C-S-H）や水酸化カルシウムが生成し、初期強度が発現すると共に舗装体としての強度が増して、例えば、タイヤの切り返しが行われる駐車場のような舗装にも耐え得る、より品質の優れたものとすることができる。 In order to further increase the strength and quality of such simple pavements, one or more of portland cement, blast furnace cement and blast furnace granulated powder (blast furnace slag powder) may be further added. A simple paving material mixed quantitatively has been proposed (see Patent Document 1). That is, calcium silicate hydrate (CSH) or water can be obtained by mixing one or two or more of Portland cement, blast furnace cement, and ground granulated blast furnace powder as a binder in addition to granulated blast furnace slag and steelmaking slag. Calcium oxide is generated, and the strength as the pavement is increased with the development of the initial strength, for example, to be superior in quality that can withstand the pavement such as a parking lot where the tire is turned over. it can.
ところが、特許文献１に記載された簡易舗装材のように、ポルトランドセメント等が予め混合されていると、その舗装材の準備（配合）から施工までの時間が限られてしまうという問題がある。すなわち、セメントはスラグが含有するような僅かな水分でも反応し、しかもその反応速度が速い。そのため、上記のような簡易舗装材を作り置きしておくことは難しく、このような材料（舗装材）を供給できるエリアも運搬時間を見越して製造場所の近隣に限られてしまう。また、これにより得られた舗装体が寒冷地で使用されると、冬期に表層付近に溜まった間隙水が凍結したり、融解したりして膨張と収縮とを繰り返すと、表層が剥離する凍害を受ける場合がある。 However, when portland cement etc. are mixed beforehand like the simple paving material indicated in patent documents 1, there is a problem that time from preparation (combination) of the paving material to construction will be restricted. That is, cement reacts even with a slight amount of water contained in slag, and the reaction rate is high. Therefore, it is difficult to make and store the simple pavement material as described above, and the area to which such a material (paving material) can be supplied is also limited to the vicinity of the manufacturing place in anticipation of the transportation time. In addition, when the pavement obtained in this way is used in a cold area, when the pore water accumulated near the surface layer in the winter freezes or thaws, and expansion and contraction are repeated, the surface layer peels off. May be received.
一方で、所定の粒径となるように破砕した製鋼スラグを高炉水砕スラグに混合した舗装材を敷設し、転圧機等で転圧した後、その表面にアスファルト乳剤のような瀝青材料やセメントペーストを散布する簡易舗装方法が知られている（特許文献２、３参照）。これらの方法によれば、骨材となる製鋼スラグや高炉水砕スラグのかみ合せによって荷重を支えることができると共に、その表層は固化したアスファルトやセメントペースト層によって被われて、骨材の移動を防ぐことができる。しかしながら、このような舗装方法では、転圧して締め固めた舗装材の中・下層部までアスファルト乳剤やセメントペーストが到達せず、また、製鋼スラグや高炉水砕スラグの水硬性を促進させるための水が十分浸透できずに、車両通行量が比較的ある場所の舗装には強度が不足してしまうおそれがある。 On the other hand, after paving material which is mixed with blast furnace granulated slag with steelmaking slag crushed to a predetermined particle size, it is compacted by a ball mill or the like, and bituminous material such as asphalt emulsion or cement on its surface A simple paving method of spraying paste is known (see Patent Documents 2 and 3). According to these methods, the load can be supported by engaging the steelmaking slag and the granulated blast furnace slag which form the aggregate, and the surface layer is covered with the solidified asphalt and the cement paste layer to move the aggregate. It can prevent. However, in such a paving method, the asphalt emulsion and the cement paste do not reach the middle and lower layer portions of the compacted paving material, and to promote the hydraulic properties of steelmaking slag and granulated blast furnace slag. There is a risk that the pavement at a location where there is a relatively large traffic volume may lack strength due to insufficient penetration of water.
なお、コンクリートの施工に関する方法であって、骨材を平坦に敷き均して、セメントが所定量混入された流動物（スラリー）を打設し、骨材同士の隙間を流動物で満たした上で、転圧して締め固める方法が知られているが（特許文献４参照）、例えば、ダム工事等である程度の厚みで敷き均した骨材に対して流動物を散布しても、骨材が障害物となるため中・下層部まで浸透させるのは難しい。そのため、コンクリートが完全に固化せずに、やはり強度不足になるおそれがある。 In addition, it is a method about construction of concrete, and the aggregate is spread evenly, and a fluid (slurry) mixed with a predetermined amount of cement is poured, and the gaps between the aggregates are filled with the fluid. There is known a method of compacting by compaction (see Patent Document 4), for example, even if a fluid is dispersed to aggregate that has been spread with a certain thickness such as dam construction, the aggregate Because it becomes an obstacle, it is difficult to penetrate the middle and lower layers. Therefore, the concrete may not be completely solidified, and the strength may still be insufficient.
上述したように、アスファルト舗装をかけない簡易舗装において、より強度が増して品質に優れた舗装体が得られるようにすることがひとつの新たな課題であり、そして、このような舗装体による簡易舗装の更なる普及を図ることが求められている。 As described above, in the simple paving without asphalt paving, it is one new problem to obtain a paving body with higher strength and superior quality, and the simplification by such paving body It is required to further spread the pavement.
そこで、本発明者らは、上記の課題を解決するために鋭意検討した結果、高炉水砕スラグと製鋼スラグとの混合材を敷き均した後、固化材を含んだ固化材スラリーを散布した上で、転圧することで、スラグの水硬性と固化材の接着性とを併せて発現させた強度に優れた舗装体が得られるようになり、しかも、固化材の反応に制約されずに舗装材の運搬等を行うことができることから、本発明を完成させた。 Therefore, as a result of intensive investigations to solve the above problems, the present inventors spread the mixed material of ground granulated blast furnace slag and steelmaking slag and then disperse the solidified material slurry containing the solidified material. Then, by rolling, it becomes possible to obtain a pavement excellent in strength that combines the hydraulic property of the slag and the adhesiveness of the solidifying material, and moreover, the paving material is not restricted by the reaction of the solidifying material. The present invention has been completed because it can be carried and the like.
したがって、本発明の目的は、強度に優れて品質の高い簡易舗装体を得ることができると共に、舗装材（材料）の運搬や供給等で制約を受けずに舗装体を施工することができる簡易舗装方法を提供することにある。 Therefore, the object of the present invention is to provide a simple and easy-to-use pavement having high strength and high quality, and to be able to apply the pavement without restriction due to transportation or supply of the paving material (material). It is to provide a paving method.
すなわち、本発明は、高炉水砕スラグと製鋼スラグとの混合材を厚さ５０ｍｍ以上３００ｍｍ以下で敷き均した後、高炉セメント、ポルトランドセメント、及び高炉スラグ微粉末からなる群から選ばれたいずれか１種又は２種以上の固化材を含んだ固化材スラリーを散布した上で、転圧することを特徴とする簡易舗装方法である。 That is, according to the present invention, after the mixed material of blast furnace granulated slag and steelmaking slag is spread at a thickness of 50 mm or more and 300 mm or less, any one selected from the group consisting of blast furnace cement, portland cement, and blast furnace slag fine powder. It is a simplified paving method characterized in that a solidifying material slurry containing one or more kinds of solidifying materials is sprayed and then compacted.
本発明に係る簡易舗装方法では、先ず、高炉水砕スラグと製鋼スラグとの混合材を厚さ５０ｍｍ以上３００ｍｍ以下、好ましくは１２０ｍｍ以上１８０ｍｍ以下で敷き均すようにする。敷き均した混合材の厚さが５０ｍｍ未満であると簡易舗装としての機能が十分に発揮できず、反対に３００ｍｍより厚いと底部まで十分に転圧が行き届かないおそれがある。 In the simple paving method according to the present invention, first, a mixture of ground granulated blast furnace slag and steelmaking slag is spread at a thickness of 50 mm or more and 300 mm or less, preferably 120 mm or more and 180 mm or less. If the thickness of the spread mixture is less than 50 mm, the function as a simple paving can not be exhibited sufficiently, and if it is thicker than 300 mm, there is a possibility that the rolling pressure may not reach the bottom sufficiently.
混合材における高炉水砕スラグと製鋼スラグとの混合割合については、水硬性による強度発現をより優れたものとする観点から、好ましくは、高炉水砕スラグと製鋼スラグとを質量比で５：９５〜３５：６５となるようにするのがよく、より好ましくは１５：８５〜２５：７５となるようにするのがよい。 The mixing ratio of the blast furnace granulated slag and the steelmaking slag in the mixed material is preferably 5: 95 by mass ratio of the granulated blast furnace slag and the steelmaking slag from the viewpoint of making the strength expression by hydraulics more excellent. It is preferable to set it to -35: 65, more preferably 15:85 to 25:75.
また、高炉水砕スラグと製鋼スラグとを混合した混合材は、転圧による締固め性をより良好なものとすることや、後に散布する固化材スラリーの浸透性を確保し易くすることなどから、粒径３０〜５ｍｍの質量通過百分率が５０％以上８０％以下であると共に、粒径５〜０ｍｍの質量通過百分率が２０％以上５０％以下となるようにするのがよく、好ましくは、粒径３０〜５ｍｍの質量通過百分率が５５％以上６５％以下であると共に、粒径５〜０ｍｍの質量通過百分率が３５％以上４５％以下となるように粒度調整されたものであるのがよい。 In addition, the mixed material in which the granulated blast furnace slag and the steelmaking slag are mixed has a better compaction property by compaction, and makes it easy to ensure the permeability of the solidified material slurry to be dispersed later. The mass passage percentage of the particle diameter 30 to 5 mm is 50% or more and 80% or less, and the mass passage percentage of the particle diameter 5 to 0 mm is preferably 20% or more and 50% or less. The particle diameter is preferably adjusted so that the mass passage percentage of the diameter 30 to 5 mm is 55% or more and 65% or less and the mass passage percentage of the particle diameter 5 to 0 mm is 35% or more and 45% or less.
そして、本発明においては、混合材を敷き均した後、高炉セメント、ポルトランドセメント、及び高炉スラグ微粉末からなる群から選ばれたいずれか１種又は２種以上の固化材を含んだ固化材スラリーを散布した上で、転圧機等を用いて転圧し、舗装体を得るようにする。 In the present invention, after the mixed material is spread, a solid material slurry containing any one or two or more solidifying materials selected from the group consisting of blast furnace cement, portland cement, and ground granulated blast furnace slag. After spraying, it is compacted using a rolling mill or the like to obtain a pavement.
ここで、敷き均された混合材に対して固化材スラリーを散布すると、固化材スラリーは重力により混合材の表層から底部に向かって浸透しようとするが、混合材が障害物となるため、固化材スラリーは混合材を避けるようにして隙間をぬって分岐を繰り返す。このとき、分岐ごとに固化材スラリー内部のせん断抵抗が大きくなり、やがて固化材スラリーの粘性が分岐を拘束することになる。つまり、敷き均された混合材に対して固化材スラリーを散布すると、ある程度の厚みの表層部分までは固化材スラリーが浸透して、敷き均された混合材の隙間に固化材が入り込めるが、混合材の底の方まで固化材スラリーを完全に浸透させるのは難しい。そのため、底の部分の混合材の隙間に固化材は入り込めないが、本発明では、先の特許文献２や特許文献３とは異なり、混合材を転圧する前に固化材スラリーを散布することから、スラリー中の水分は比較的浸透して混合材の水硬性が発現し易くなる。 Here, when the solidified material slurry is sprayed to the spread mixed material, the solidified material slurry tries to penetrate from the surface layer to the bottom of the mixed material by gravity, but the mixed material becomes an obstacle, so the solidified material is solidified. The material slurry is repeatedly branched with gaps in a manner to avoid the mixed material. At this time, the shear resistance inside the solidifying material slurry increases with each branch, and eventually the viscosity of the solidifying material slurry constrains the branch. In other words, when the solidified material slurry is dispersed to the spread mixed material, the solidified material slurry penetrates to the surface layer part of a certain thickness, and the solidified material can enter into the gaps of the spread mixed material, It is difficult to completely infiltrate the solidified slurry to the bottom of the material. Therefore, although the solidified material can not enter into the gap of the mixed material in the bottom part, in the present invention, unlike the above-mentioned Patent Document 2 and Patent Document 3, scattering the solidified material slurry before rolling the mixed material Thus, the water in the slurry penetrates relatively and the hydraulic properties of the mixed material are easily developed.
本発明における固化材スラリーについては、敷き均された混合材への浸透性をより良好なものとする観点から、好ましくは、固化材スラリーは固化材と水とを質量比３０：７０〜１０：９０で混合したものであるのがよい。また、固化材スラリーを形成する固化材については、高炉セメント、ポルトランドセメント、又は高炉スラグ微粉末のいずれか１種又は２種以上を混ぜて使用でき、これらは公知のものを用いることができる。なかでも、好ましくは、固化材の比表面積が３０００ｃｍ２／ｇ以上５０００ｃｍ２／ｇ以下のものであると、混合材の表面での固化材スラリーの滞留をできるだけ抑えて、固化材スラリーの浸透性を確保し易くすることができる。 The solidifying material slurry in the present invention preferably has a solidifying material and water mass ratio of 30: 70 to 10: from the viewpoint of making the permeability to the spread mixed material better. It should be mixed at 90. In addition, as the solidifying material forming the solidifying material slurry, any one kind or two or more kinds of blast furnace cement, portland cement, or ground granulated blast furnace slag can be mixed and used, and known materials can be used. Among them, preferably, the specific surface area of the solidifying material is of less 3000 cm 2 / g or more 5000 cm 2 / g, is suppressed as much as possible the retention of the solidifying material slurry on the surface of the mixed material, the permeability of the solidified material slurry Can be made easy.
敷き均された混合材に対して散布する固化材スラリーの散布量に関しては、得られる舗装体の強度をより優れたものとするために、好ましくは、固化材スラリーにおける固化材が、混合材に対して内割りで０．２質量％以上２．０質量％以下となるようにするのがよい。また、本発明においては、固化材スラリーの散布に先駆けて、敷き均した混合材に対して水を散布し、固化材スラリーが到達できないような底の部分の混合材に水を供給するようにしてもよい。その際の散水量としては、好ましくは、敷き均した混合材に対して外添で１．５質量％以上５．０質量％以下であるのがよい。 With regard to the amount of the solidified material slurry to be applied to the spread mixture, in order to make the strength of the obtained paving body better, preferably, the solidified material in the solidified material slurry is added to the mixed material On the other hand, it is preferable to set the content to be 0.2% by mass or more and 2.0% by mass or less. Further, in the present invention, prior to the application of the solidifying material slurry, water is applied to the spread mixed material so that the water is supplied to the mixed material in the bottom part where the solidifying material slurry can not reach. May be The amount of water spray at that time is preferably 1.5% by mass or more and 5.0% by mass or less by external addition to the spread mixing material.
本発明によって得られた舗装体は、簡易舗装ながらも優れた強度を発現できることから、特にその用途について制限はないが、例えば、林道や仮設道路といった比較的車両通行量の少ない道路や歩道、市町村道のような管理道をはじめ、タイヤの切り返しが行われる駐車場のような、いわゆる品質の高い簡易舗装として使用することができる。しかも、本発明で得られた舗装体は、表層の透水係数が低下して雨水等の侵入を低減させることができることから、例えば、寒冷地で施工された場合でも、舗装体に浸透した水分の凍結、融解による膨張・収縮の繰り返しで生じる表層の剥離（いわゆる凍害）を防ぐことができる。 The pavement obtained by the present invention is not particularly limited in its use because it can exhibit excellent strength while simple paving, but for example, roads, sidewalks, municipalities, etc. where vehicle traffic is relatively small, such as forest roads and temporary roads. It can be used as a so-called high-quality simple pavement such as a road management road and a parking lot where tires are switched. Moreover, since the pavement obtained in the present invention has a reduced permeability coefficient of the surface layer and can reduce the infiltration of rain water etc., for example, even when the construction is carried out in a cold area, It is possible to prevent exfoliation of the surface layer (so-called freezing damage) caused by repeated expansion and contraction due to freezing and thawing.
また、本発明は、既存の舗装体の補修方法としても用いることが出来る。例えば、高炉水砕スラグや製鋼スラグ等を混合した簡易舗装材料を用いたような舗装体は、設計交通量以上の車両通行負荷により、表面がはく離し、平坦性を損なうケースが見られる。このように損傷した舗装体において、表層を適度に解砕し、新たに高炉水砕スラグと製鋼スラグとの混合材を厚さ５０ｍｍ以上３００ｍｍ以下で再度敷き均した上で、固化材スラリーを散布して転圧することにより、補修することができる。補修された舗装体は、固化体スラリーの散布により補修前よりも優れた強度を有し、品質の高い簡易舗装として使用することが可能である。 In addition, the present invention can also be used as a method of repairing an existing pavement. For example, in the case of a paving body using a simple paving material mixed with ground granulated blast furnace slag, steelmaking slag, etc., there are cases where the surface is peeled off and the flatness is impaired due to the vehicle traffic load exceeding the design traffic volume. In the pavement body damaged in this way, the surface layer is appropriately crushed and newly mixed with blast furnace granulated slag and steelmaking slag again spread with a thickness of 50 mm or more and 300 mm or less, and then the solidified material slurry is dispersed. It can be repaired by rolling. The repaired pavement has a strength higher than that before the repair due to the dispersion of the solidified slurry, and can be used as a high quality simplified pavement.
本発明によれば、アスファルト舗装をかけない簡易舗装において、強度に優れた品質の高い簡易舗装体を得ることができる。しかも、固化材の反応に制約されずに舗装材の運搬や供給等が行えることから、このような簡易舗装の更なる普及を図ることができる。 ADVANTAGE OF THE INVENTION According to this invention, in the simple pavement which does not put an asphalt pavement, the high quality simple pavement body which was excellent in intensity | strength can be obtained. And since conveyance, supply, etc. of a pavement material can be carried out without being restricted by reaction of a solidification material, such simple pavement can be further spread.
以下、本発明の簡易舗装方法について、図面等を用いながら具体的に説明する。
先ず、本発明においては、図１に示したように、ダンプトラック等を用いて高炉水砕スラグと製鋼スラグとの混合材を施工現場に搬入して、ショベルカー等で地盤の上に撒き出し、所定の厚さとなるように敷き均す。次いで、高炉セメント、ポルトランドセメント、及び高炉スラグ微粉末からなる群から選ばれたいずれか１種又は２種以上の固化材を含んだ固化材スラリーを敷き均した混合材に散布する。
Hereinafter, the simple paving method of the present invention will be specifically described using drawings and the like.
First, in the present invention, as shown in FIG. 1, a mixed material of blast furnace granulated slag and steelmaking slag is carried into a construction site using a dump truck or the like, and is extracted on the ground by a shovel car or the like. , To obtain a predetermined thickness. Next, a solidified material slurry containing any one or two or more types of solidified material selected from the group consisting of blast furnace cement, portland cement, and ground granulated blast furnace slag is dispersed over the spread mixture.
このとき、固化材スラリーの散布に先駆けて、敷き均した混合材に対して水を散布するようにしてもよく、散水する水として海水を用いるようにしてもよい。そして、固化材スラリーを散布した後には、大型のローラロードや小型のプレート等の転圧機を用いて転圧し、１週間から２週間程度養生することで、強固な舗装体を得ることができる。 At this time, prior to the application of the solidifying material slurry, water may be applied to the spread mixing material, and seawater may be used as the water to be sprayed. Then, after the solidified material slurry is sprayed, a compact pavement can be obtained by rolling and compacting using a large-sized roller load or a compactor such as a small plate, and curing for about one week to two weeks.
得られた舗装体に関して、図２には、横軸を強度、縦軸を表面からの深さとしたときの、特許文献４に係る従来技術と本発明とを比較した様子が模式的に示されている。上述した特許文献４のように、敷き均された砕石に対してセメント等を含んだスラリーを散布しても、表面からある程度の深さまではスラリーが浸透するものの、底の方まで完全に浸透させることはできない。つまり、表層部分は砕石とセメントにより強度発現するが、底部ではセメントが行き届かずに砕石だけになる。これに対して、本発明では、底の方まで固化材が届かなくても、水の浸透により水硬性を有した鉄鋼スラグ（高炉水砕スラグと製鋼スラグとの混合材）が強度を発現し、また、表層部分では更に固化材を含めた強度を有するようになる。このように、本発明の簡易舗装方法によれば、表層から底の方に至るまで強固な舗装体を得ることができる。 With regard to the obtained pavement, FIG. 2 schematically shows a comparison between the prior art according to Patent Document 4 and the present invention when the horizontal axis represents strength and the vertical axis represents depth from the surface. ing. As in Patent Document 4 described above, even if a slurry containing cement or the like is sprayed to spread crushed stone, the slurry penetrates to some extent from the surface, but penetrates completely to the bottom side. It is not possible. In other words, the surface part is developed by crushed stone and cement, but at the bottom the cement does not reach and only crushed stone. On the other hand, in the present invention, even if the solidifying material does not reach the bottom, the steel slag (a mixture of ground granulated blast furnace slag and steelmaking slag) having hydraulic properties by the penetration of water develops strength. Also, in the surface layer portion, the strength further includes the solidifying material. As described above, according to the simple paving method of the present invention, a strong paving body can be obtained from the surface layer to the bottom.
本発明に係る簡易舗装方法について、表１に示した配合に基づき、次のような実験を行った。先ず、高炉水砕スラグと製鋼スラグとを質量比で２０：８０となるように混合した混合材を内径φ１００ｍｍ×高さ２００ｍｍのプラモールド缶に入れた。このとき、プラモールド缶には１３０ｍｍの高さで混合材を入れた。また、混合材は９質量％（外数）の水分を含んでおり、その内訳は、高炉水砕スラグと製鋼スラグとが保有した自然含水量が４質量％であり、別途散水した水分量が５質量％である。なお、表１における試験Ｎｏ．１〜４の各材料は、上段が配合割合（質量%）を表し、下段が１ｍ３あたりの配合量（kg/m3）を表す。また、ここで使用した高炉セメントは４０００ｃｍ２／ｇの比表面積を有するものであり、更に、高炉水砕スラグと製鋼スラグの混合材は、粒径３０〜５ｍｍの質量通過百分率が６４％であり、粒径５〜０ｍｍの質量通過百分率が３６％である。 The following experiment was performed based on the composition shown in Table 1 about the simple paving method concerning the present invention. First, a mixed material obtained by mixing granulated blast furnace slag and steelmaking slag so as to have a mass ratio of 20:80 was placed in a plastic mold can with an inner diameter of 100 mm and a height of 200 mm. At this time, the mixed material was added to the plastic mold can at a height of 130 mm. In addition, the mixed material contains 9% by mass (outside) of water, and the breakdown is that the natural water content held by ground granulated blast furnace slag and steelmaking slag is 4% by mass, and the amount of water separately sprinkled is It is 5% by mass. In addition, the test No. in Table 1 is. In each material of 1 to 4, the upper part represents the blending ratio (% by mass), and the lower part represents the blending amount per 1 m 3 (kg / m 3 ). In addition, the blast furnace cement used here has a specific surface area of 4000 cm 2 / g, and further, the mixed material of ground granulated blast furnace slag and steelmaking slag has a mass passing percentage with a particle diameter of 30 to 5 mm of 64%. The mass passage percentage of the particle size 5 to 0 mm is 36%.
次いで、表１に示した配合量となるように固化材として高炉セメントを用意して、これを試験Ｎｏ．１〜４のように水で希釈してそれぞれ固化材スラリーとし、上記プラモールド缶に入れられた混合材の表面に対して万遍なく流し込んだ。また、この実験で用いたプラモールド缶の底には、φ４ｍｍ程度の水抜き孔が円周方向に沿って合計６つ設けられており、プラモールド缶の底に達して余った水分は外部に流出されるようにした。 Then, blast furnace cement was prepared as a solidification material so that it might become the compounding quantity shown in Table 1, and this was tested No. The mixture was diluted with water as in 1 to 4 to form a solidifying material slurry, and the slurry was poured uniformly onto the surface of the mixed material placed in the plastic mold can. In addition, in the bottom of the plastic mold can used in this experiment, a total of six water removal holes with a diameter of about 4 mm are provided along the circumferential direction, and the remaining moisture reaching the bottom of the plastic mold can be provided outside It was made to be drained.
プラモールド缶内の混合材に対して上記で固化材スラリーを散布した後に、混合材の表面に内径φ１０ｍｍの円盤状の鋼板（PL-9）を載せ、この鋼板の上から突き棒で混合材を突き固めて、プラモールド缶内の混合材が高さ１００ｍｍになるように転圧した。そして、温度２０℃の室内に１週間放置して養生した後、プラモールド缶を半割り（縦割り）状態にして脱枠して、試験Ｎｏ．１〜４に係る試験体を得た。 After spraying the solidified material slurry onto the mixed material in the plastic mold can, a disc-shaped steel plate (PL-9) with an inner diameter of 10 mm is placed on the surface of the mixed material, and the mixed material is put on the steel plate from the top of the steel plate. Was compacted so that the mixed material in the plastic mold can had a height of 100 mm. Then, after leaving in a room at a temperature of 20 ° C. for 1 week and curing, the plastic mold can was half-divided (vertically split) and removed from the frame. Test specimens according to 1 to 4 were obtained.
得られた試験体について、その固結状態を調べたところ、表面部分から固結していることが確認された。また、固結が弱い底部を手で解すことにより、固化材スラリーが浸透して固結強度が大きい部分だけを残して固化材スラリーに含まれた高炉セメントの浸透深さを評価し、固化材スラリーにおける高炉セメントの比率との関係を調べたところ、図３に示したとおりであった。すなわち、固化材スラリー中の固化材比率を３０質量量％以下にすることで、表面から５０ｍｍ以内に存在する骨材の間隙に固化材スラリーが充填され、舗装体としての機能をより高めることが可能であると言える。 About the obtained test body, when the consolidation state was investigated, it was confirmed that it was consolidated from the surface part. In addition, by manually loosening the bottom of weak consolidation, the penetration depth of blast furnace cement contained in the consolidation slurry is evaluated, leaving only the part where the consolidation slurry penetrates and the consolidation strength is large, and the consolidation material When the relationship with the ratio of blast furnace cement in the slurry was examined, it was as shown in FIG. That is, by setting the solidifying material ratio in the solidifying material slurry to 30 mass% or less, the solidifying material slurry is filled in gaps of aggregate existing within 50 mm from the surface to further enhance the function as a pavement body It can be said that it is possible.
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