JP2012052408A - Simple pavement material and simple pavement method - Google Patents
Simple pavement material and simple pavement method Download PDFInfo
- Publication number
- JP2012052408A JP2012052408A JP2011169604A JP2011169604A JP2012052408A JP 2012052408 A JP2012052408 A JP 2012052408A JP 2011169604 A JP2011169604 A JP 2011169604A JP 2011169604 A JP2011169604 A JP 2011169604A JP 2012052408 A JP2012052408 A JP 2012052408A
- Authority
- JP
- Japan
- Prior art keywords
- mass
- simple pavement
- slag
- less
- blast furnace
- 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.)
- Granted
Links
Images
Abstract
Description
本発明は、簡易舗装材料及び簡易舗装方法に関する。 The present invention relates to a simple pavement material and a simple pavement method.
製鋼工程で発生する製鋼スラグは、路盤材に使用された場合、未滓化のＣａＯ分を多く含んでいるために水分を吸収して膨張し崩壊するという問題がある。このため日本工業規格「道路用鉄鋼スラグ」（ＪＩＳ Ａ ５０１５）では、膨張性に対する安定化のために空気及び水と反応させる通常エージングを６ヵ月以上、あるいは温水又は蒸気を用いた促進エージングを３ヵ月以上実施することを定めており、さらに附属書２に規定する水浸膨張試験方法による水浸膨張比が１．５％以下であることを定めている。 When steelmaking slag generated in a steelmaking process is used as a roadbed material, it has a problem that it absorbs moisture and expands and collapses because it contains a large amount of unoxidized CaO. For this reason, the Japanese Industrial Standard “Steel Slag for Roads” (JIS A 5015) requires 6 months or more of normal aging to react with air and water for stabilization against expansion, or accelerated aging using hot water or steam. It is stipulated that it should be carried out for more than a month, and that the water immersion expansion ratio according to the water immersion expansion test method specified in Annex 2 is 1.5% or less.
しかしながら、前記特許文献１に開示された方法は、転圧時の締め固め時間および転圧後の固結時間が短く、且つ高い強度を得るために、転圧された舗装材の表面にセメントペーストを散布することが必要である。また、特許文献２に開示された方法も、転圧後にアスファルト乳剤を散布することを前提としたものであり、いずれもセメントやアスファルトのように高価な素材を必要とし簡易舗装方法としては材料費、製造費が高くなるという課題があった。 However, in the method disclosed in Patent Document 1, the cement paste is applied to the surface of the compacted pavement material in order to obtain a high strength in order to shorten the compaction time during compaction and the compaction time after compaction. It is necessary to spray. In addition, the method disclosed in Patent Document 2 is also based on the premise that an asphalt emulsion is sprayed after rolling, and both require expensive materials such as cement and asphalt, and as a simple pavement method, the material cost is low. There was a problem that the manufacturing cost was high.
本発明の目的は、材料費、施工費の増大を抑制でき、転圧したままで十分な強度が得られる簡易舗装材料、及び簡易舗装方法を提供することにある。 An object of the present invention is to provide a simple pavement material and a simple pavement method capable of suppressing an increase in material cost and construction cost and obtaining sufficient strength while being rolled.
本発明は、以下を要旨とするものである。
（１）水浸膨張比が１．５％を超え６．０％以下であり、かつ、粒径が４０ｍｍ以下の製鋼スラグと高炉水砕スラグを混合してなる簡易舗装材料であって、
前記高炉水砕スラグの全量に対する含有量が５質量％以上、３５質量％以下であることを特徴とする簡易舗装材料。
（２）湿式磁力選別で排出された製鋼スラグスラリーを、全量に対して３０質量％以下混合したことを特徴とする（１）に記載の簡易舗装材料。
（３）ポルトランドセメント，高炉セメント，高炉水砕微粉末のうち１種または２種以上を、全量に対して１．５％質量％以上、４．５％質量％以下混合したことを特徴とする（１）又は（２）に記載の簡易舗装材料。
The gist of the present invention is as follows.
(1) A simple pavement material formed by mixing steelmaking slag having a water immersion expansion ratio exceeding 1.5% and not more than 6.0% and having a particle diameter of 40 mm or less and blast furnace granulated slag,
Content with respect to the whole quantity of the said blast-furnace granulated slag is 5 mass% or more and 35 mass% or less, The simple pavement material characterized by the above-mentioned.
(2) The simple pavement material according to (1), wherein the steelmaking slag slurry discharged by the wet magnetic separation is mixed with 30% by mass or less based on the total amount.
(3) One or more of Portland cement, blast furnace cement, and granulated blast furnace powder are mixed in an amount of 1.5% by mass or more and 4.5% by mass or less based on the total amount. The simple pavement material according to (1) or (2).
（４）（１）乃至（３）のいずれかに記載の簡易舗装材料を敷き均し、水を散布した後、前記簡易舗装材料を転圧することを特徴とする簡易舗装方法。
（５）散布する水が海水、または、塩化カルシウムを２質量％以上、８質量％以下含有する水であることを特徴とする（４）記載の簡易舗装方法。
（６）振動式の転圧機を用いて前記簡易舗装材料を転圧することを特徴とする（４）又は（５）に記載の簡易舗装方法。
ここで、４０ｍｍ以下の製鋼スラグとは、目開き４０ｍｍの篩でふるって網目を通り抜けたものを示す。また、高炉水砕スラグとは、溶融した高炉スラグに加圧水を噴射するなどして、急激に冷却したままのガラス質の粒状スラグであり、粉砕して粉末状になった高炉水砕スラグ粉末は含まない。また、高炉水砕微粉末とは、高炉水砕スラグを乾燥し粉砕した、JIS A 6206に規定されているコンクリート用の高炉水砕微粉末を示す。
(4) A simple pavement method comprising rolling and compacting the simple pavement material after spreading and leveling the simple pavement material according to any one of (1) to (3).
(5) The simple pavement method according to (4), wherein the water to be sprayed is seawater or water containing 2% by mass or more and 8% by mass or less of calcium chloride.
(6) The simple pavement method according to (4) or (5), wherein the simple pavement material is rolled using a vibration type rolling compactor.
Here, the steelmaking slag of 40 mm or less refers to a steelmaking slag that has passed through a mesh with a sieve having an opening of 40 mm. In addition, granulated blast furnace slag is a granular granular slag that has been rapidly cooled by, for example, injecting pressurized water into the molten blast furnace slag. Not included. The granulated blast furnace granulated powder is a granulated blast furnace granulated powder for concrete as defined in JIS A 6206 obtained by drying and pulverizing blast furnace granulated slag.
本発明によれば、簡易舗装材料が、水浸膨張比１．５％を超え、６％以下で粒径が４０ｍｍ以下の製鋼スラグを含んでいるため、施工後に水を散布することで、製鋼スラグを膨張させて舗装体の空隙をなくすことができ、強固な舗装体を得ることができる。また、シリカ、アルミナを多く含む高炉水砕スラグを全重量に対して５質量％以上、３５質量％以下混合することにより、製鋼スラグから溶け出すカルシウム分と、高炉水砕スラグから溶け出すシリカ、アルミナと、保有水分とによりポゾラン反応といわれるセメントの反応と類似の反応を促進することができ、舗装体の強度をさらに向上させることができる。
また、粒径１ｍｍ以下の製鋼スラグを３０質量％以下混合させることで、カルシウムが多量に溶出し、ポゾラン反応に加えて、カルシウムと水が反応して生成する水酸化カルシウムが空気中の二酸化炭素と反応して固結化する炭酸化反応が起こり強度の発現が著しくなる。
また、結合材として、ポルトランドセメント，高炉セメント，高炉水砕微粉末のうち１種または２種以上を１．５％質量％以上、４．５％質量％以下を混合させることで、養生日数を３日に低減できる。この理由は、ポルトランドセメント，高炉セメント，高炉水砕微粉末を混合する事で、カルシウムシリケイト水和物(Ｃ−Ｓ−Ｈ)と水酸化カルシウムが生成し初期強度が発現する為である。
According to the present invention, the simple pavement material includes steelmaking slag with a water immersion expansion ratio exceeding 1.5% and 6% or less and a particle size of 40 mm or less. By expanding the slag, voids in the pavement can be eliminated, and a strong pavement can be obtained. Moreover, by mixing 5 mass% or more and 35 mass% or less of granulated blast furnace slag containing a large amount of silica and alumina, the calcium content that melts from the steelmaking slag, and the silica that melts from the blast furnace granulated slag, Alumina and the retained water can promote a reaction similar to the reaction of cement called pozzolanic reaction, and the strength of the pavement can be further improved.
Further, by mixing 30% by mass or less of steelmaking slag having a particle diameter of 1 mm or less, a large amount of calcium is eluted, and in addition to the pozzolanic reaction, calcium hydroxide produced by the reaction of calcium and water is carbon dioxide in the air. A carbonation reaction that solidifies by reaction occurs and the development of strength becomes remarkable.
In addition, as a binder, one or more of Portland cement, blast furnace cement, and granulated blast furnace powder are mixed with 1.5% by mass or more and 4.5% by mass or less, so that the number of days of curing can be increased. It can be reduced to 3 days. The reason for this is that by mixing Portland cement, blast furnace cement, and granulated blast furnace granulated powder, calcium silicate hydrate (C—S—H) and calcium hydroxide are generated and initial strength is developed.
また、本発明に係る簡易舗装方法は、上記のように調製して敷き均した簡易舗装材料に対し外添で７質量％以上、３５質量％以下に散水した後に転圧して施工するので、高い強度が得られる。
また、散水する水として海水を用いるか、または、塩化カルシウムを２質量％以上、８質量％以下含有する水を用い転圧すると、カルシウムの溶解度が水よりも１０倍程度高くなることで、製鋼スラグの中からカルシウムの溶出量が上昇し、高炉水砕スラグのシリカ、アルミナ分と反応するポゾラン反応が促進される。
In addition, the simple pavement method according to the present invention is applied to the simple pavement material prepared and spread as described above by sprinkling water to 7% by mass or more and 35% by mass or less after external spraying. Strength is obtained.
Further, when seawater is used as water to be sprinkled, or when rolling is performed using water containing 2% by mass or more and 8% by mass or less of calcium chloride, the solubility of calcium becomes about 10 times higher than that of water. The amount of calcium elution increases from the slag, and the pozzolanic reaction that reacts with the silica and alumina content of the granulated blast furnace slag is promoted.
また、振動式の転圧機を用いて転圧することで、製鋼スラグと高炉水砕の締め固めが進み、強度の発現が著しくなる。その結果、単純な転圧以上に、より強度が発現する。 Further, by rolling using a vibration type compacting machine, the steelmaking slag and blast furnace water granulation are compacted, and the development of strength becomes remarkable. As a result, more strength is developed than simple rolling.
以下、本発明を詳細に説明する。
本発明に係る簡易舗装材料は、水浸膨張比が１．５％を超え６．０％以下であり、かつ、粒径が４０ｍｍ以下の製鋼スラグと高炉水砕スラグから成る簡易舗装材料であって、全量に対する高炉水砕スラグの含有量が５質量％以上、３５質量％以下であることを特徴とする。
本発明は、簡易舗装材料であるため、日本工業規格「道路用鉄鋼スラグ」（ＪＩＳ Ａ ５０１５）で定められた水浸膨張試験方法による水浸膨張比が１．５％以下である製鋼スラグを使用せず、水浸膨張比が１．５％を超え、６．０％以下の製鋼スラグを用いる。
本発明の製鋼スラグは、水浸膨張比が大きいことから、施工後製鋼スラグが膨張し、膨張した製鋼スラグが舗装体の空隙を充填することで、強固な舗装体が得られる。
Hereinafter, the present invention will be described in detail.
The simple pavement material according to the present invention is a simple pavement material composed of steelmaking slag having a water immersion expansion ratio exceeding 1.5% and not more than 6.0% and having a particle size of 40 mm or less and granulated blast furnace slag. The content of the granulated blast furnace slag with respect to the total amount is 5% by mass or more and 35% by mass or less.
Since the present invention is a simple pavement material, a steelmaking slag having a water immersion expansion ratio of 1.5% or less according to a water immersion expansion test method defined in Japanese Industrial Standard “Steel Slag for Roads” (JIS A 5015) is used. Not used, and steelmaking slag having a water immersion expansion ratio exceeding 1.5% and not more than 6.0% is used.
Since the steelmaking slag of the present invention has a large water immersion expansion ratio, the steelmaking slag after construction expands, and the expanded steelmaking slag fills the voids of the pavement, whereby a strong pavement is obtained.
粒径４０ｍｍ以下の製鋼スラグ７０質量％と、高炉水砕スラグを３０質量％混合し、大型のローラロードで締め固めた後の１ヶ月と３ヶ月後に地盤の強度を測定した。製鋼スラグの水浸膨張比（％）と簡易舗装のキャスポルＣＢＲ％値の関係を図１に示す。
ここで、簡易舗装のキャスポルＣＢＲ％値とは、簡易支持力測定器キャスポル（国土交通省の近畿技術事務所で開発された測定器）で測定される簡易舗装の強度である。
製鋼スラグの水浸膨張比（％）が、１．５％以下、または、６．０％を超えると、簡易舗装材のキャスポルＣＢＲ％値が急激に低下する。また、製鋼スラグの水浸膨張比（％）が、６．０％を超える場合、施工の３ヵ月後の簡易舗装材に割れが発生する。
70% by mass of steelmaking slag having a particle size of 40 mm or less and 30% by mass of granulated blast furnace slag were mixed, and the strength of the ground was measured after 1 month and 3 months after compacting with a large roller load. The relationship between the water immersion expansion ratio (%) of the steelmaking slag and the Caspol CBR% value of the simple pavement is shown in FIG.
Here, the simple pavement Caspol CBR% value is the strength of the simple pavement measured with a simple bearing capacity measuring device, Caspol (a measurement device developed at the Kinki Technical Office of the Ministry of Land, Infrastructure, Transport and Tourism).
When the water immersion expansion ratio (%) of the steelmaking slag exceeds 1.5% or exceeds 6.0%, the Caspol CBR% value of the simple pavement material decreases rapidly. Moreover, when the water immersion expansion ratio (%) of the steelmaking slag exceeds 6.0%, cracks occur in the simple pavement material after 3 months of construction.
施工中、または、施工後に、製鋼スラグ（SiO2=10〜15%，Al2O３=2%程度,CaO=42〜48%）中のカルシウムがスラグ界面に付着する水に溶け出し、付着水に溶けた大気中の炭酸ガスと反応して水酸化カルシウムや炭酸カルシウムに化学変化する。その際に１．５倍以上に体積膨張し、この作用で製鋼スラグ間の空隙が満たされ締め固めが進み、地盤の強度が増す。１．５％以下の水浸膨張比の製鋼スラグでは必要な強度が得られない理由は、この膨張による締め固め量が少ない為に強度が発現しなかったからである。
一方、６．０％以上の水浸膨張比のスラグで必要な強度が得られない理由は、カルシウム溶出による体積膨張で製鋼スラグ間の空隙以上に膨張を起こし、内部応力が増大し、割れが発生したためである。
During or after construction, calcium in steelmaking slag (SiO2 = 10-15%, Al2O3 = 2%, CaO = 42-48%) dissolved in the water adhering to the slag interface and dissolved in the adhering water It reacts with carbon dioxide in the atmosphere and chemically changes to calcium hydroxide and calcium carbonate. At that time, the volume expands by 1.5 times or more, and this action fills the gap between the steelmaking slags and the compaction proceeds, increasing the strength of the ground. The reason why the steelmaking slag having a water immersion expansion ratio of 1.5% or less cannot obtain the required strength is that the strength is not exhibited because the amount of compaction due to this expansion is small.
On the other hand, the reason why the required strength cannot be obtained with a slag having a water immersion expansion ratio of 6.0% or more is that the volume expansion caused by calcium elution causes expansion beyond the gaps between the steelmaking slags, increasing the internal stress and causing cracks. This is because it occurred.
本発明に係る簡易舗装材料は、製鋼スラグに５質量％以上、３５質量％以下の高炉水砕スラグを混合する。水浸膨張比２％の製綱スラグと高炉水砕スラグを混合し、高炉水砕スラグの質量％を変えて、大型のローラロードで締め固めた後の１ヶ月と３ヶ月後に地盤の強度を測定した。高炉水砕スラグ質量％とキャスポルＣＢＲ％値の関係を図２に示す。高炉水砕スラグの質量％が、５質量％未満又は３５質量％を超えると、簡易舗装材のキャスポルＣＢＲ％値が急激に低下することがわかった。高炉水砕スラグが５％未満では高炉水砕スラグ（SiO2=30〜35%Al３O3=10〜15%,CaO=38〜43%）から溶け出すシリカ，アルミナが少ないために、ポゾラン反応が十分に起こらず簡易舗装の強度が上昇しない。高炉水砕スラグの量が３５質量％以上になると、相対的に製鋼スラグ量が少なくなり、溶出するカルシウムが少なくなるため、ポゾラン反応が十分に起こらず簡易舗装の強度が上昇しない。 The simple pavement material which concerns on this invention mixes 5 mass% or more and 35 mass% or less of granulated blast furnace slag with steelmaking slag. Mixing steelmaking slag with a water immersion expansion ratio of 2% and granulated blast furnace slag, changing the mass percentage of the granulated blast furnace slag, and increasing the strength of the ground after one month and three months after compacting with a large roller load It was measured. FIG. 2 shows the relationship between the granulated blast furnace slag mass% and the Caspol CBR% value. It was found that when the mass% of the blast furnace granulated slag is less than 5 mass% or exceeds 35 mass%, the Caspol CBR% value of the simple pavement material is rapidly decreased. If the granulated blast furnace slag is less than 5%, the pozzolanic reaction is sufficient because there is little silica and alumina that dissolves from the granulated blast furnace slag (SiO2 = 30 to 35% Al3O3 = 10 to 15%, CaO = 38 to 43%). It does not occur and the strength of the simple pavement does not increase. When the amount of granulated blast furnace slag is 35% by mass or more, the amount of steelmaking slag is relatively reduced and the amount of calcium eluted is reduced, so that the pozzolanic reaction does not occur sufficiently and the strength of the simple pavement does not increase.
なお、図２で、１ヶ月後より３ヶ月後の強度が高いのは、高炉水砕スラグ中のアルミナやシリカなどは、時間の経過と伴に、スラグ表面の付着水にゆっくりと溶け出してくるので、ポゾラン反応もゆっくりと進み、さらに強度のあるカルシウム，アルミナやシリカの水和物が出来、時間をかけて固まることで、割れを生じることなく強度が発現するからである。 In FIG. 2, the strength after 3 months is higher than after 1 month because the alumina and silica in the granulated blast furnace slag are slowly dissolved in the water adhering to the slag surface as time passes. This is because the pozzolanic reaction proceeds slowly, and stronger calcium, alumina, and silica hydrates can be formed and solidify over time, so that strength develops without causing cracks.
本発明に係る簡易舗装材料は、製鋼スラグに、高炉水砕スラグ粉末ではなく、未粉砕の高炉水砕スラグを５質量％以上、３５質量％以下混合してなることを特徴とする。粉砕した高炉水砕スラグ粉末と未粉砕の高炉水砕スラグを比較する実験を行った。粒径４０ｍｍ以下であり、水浸膨張比が１．７％の製鋼スラグに未粉砕の高炉水砕スラグを１５質量％混合した場合のキャスポルＣＢＲ％値と膨張率の時系列的変化を図３に示す。次に、粒径４０ｍｍ以下であり、水浸膨張比が１．７％の製鋼スラグに高炉水砕スラグ粉末を５質量％混合した場合のキャスポルＣＢＲ％値と膨張率の時系列的変化を図４に示す。 A simple pavement material according to the present invention is characterized in that steel slag is mixed with 5 to 35% by mass of unground blast furnace granulated slag instead of blast furnace granulated slag powder. An experiment was conducted to compare crushed blast furnace granulated slag powder with unground blast furnace granulated slag. Fig. 3 shows time-series changes in Caspol CBR% value and expansion rate when 15% by mass of unground blast furnace granulated slag is mixed with steelmaking slag having a particle size of 40 mm or less and a water immersion expansion ratio of 1.7%. Shown in Next, the time-series changes of the Caspol CBR% value and the expansion coefficient when 5 mass% of granulated blast furnace slag powder is mixed with steelmaking slag having a particle size of 40 mm or less and a water immersion expansion ratio of 1.7% are shown in FIG. 4 shows.
図３で、本願発明に係る簡易舗装材料で、未粉砕の高炉水砕スラグを用いた施工の場合は、施工体の膨張は、時間の経過に従い除々に進行する。これに対し、高炉水砕スラグ粉末を混合した図４の場合は、施工体の固化が急速に進行し、キャスポルＣＢＲ％値の上昇が早く、施工後３ヵ月後に割れが発生した。このことより、簡易舗装材料としては、製鋼スラグに、未粉砕の高炉水砕スラグを配合して用いることが好ましい。従来技術のように、高炉水砕スラグ粉末やセメントを混合すると、早期に固化してしまい、水浸膨張比が１．５％を超える製鋼スラグは、固化した後に膨張を起こすので、図４に示すように、内部応力が高まり膨れると共に、亀裂が入る。そこで、本発明のように、未粉砕で固化の速度の遅い高炉水砕スラグをそのまま入れ、膨張で締め固めを進めた後で、固化を徐々に促進する形態をとることができる。 In FIG. 3, in the case of construction using the unground blast furnace granulated slag with the simple pavement material according to the present invention, the expansion of the construction body gradually proceeds as time passes. On the other hand, in the case of FIG. 4 in which blast furnace granulated slag powder was mixed, the solidification of the construction progressed rapidly, the Caspol CBR% value increased rapidly, and cracking occurred 3 months after construction. From this, it is preferable to mix and use unmilled blast furnace granulated slag as steelmaking slag as a simple pavement material. As in the prior art, when blast furnace granulated slag powder or cement is mixed, the steelmaking slag with a water immersion expansion ratio exceeding 1.5% is solidified at an early stage. As shown, the internal stress increases and swells and cracks occur. Therefore, as in the present invention, it is possible to take a form in which solidification is gradually accelerated after pulverized granulated blast furnace slag, which has not been crushed and has a slow solidification rate, is put in as it is and compaction is advanced by expansion.
さらに、製鋼スラグの粒鉄回収の湿式磁力選鉱で発生するスラリー状の製鋼スラグをフィルターで含水率が20質量％以下に脱水した製鋼スラグスラリーを加えて施工すると、簡易舗装の強度が向上する。これは、製鋼スラグスラリーの粒径は０．１ｍｍ以下と非常に小さく、含まれるカルシウムが、４０ｍｍ以下の製鋼スラグより多く溶出し易いため、ポゾラン反応に加えて、カルシウムと水が反応して生成する水酸化カルシウムが空気中の二酸化炭素と反応して固結化する炭酸化反応が起こりやすくなるためと考える。したがって、湿式磁力選鉱を保有しかつ製鋼スラグのスラリーが発生する場合は、さらなる強度発現の為に、素材として活用することが望ましい。
ただし、製鋼スラグスラリーを３０質量％以上加えると、微粉部が極端に多くなり、骨材が相対的に少なくなる為に、強度が発現しない傾向がある。
Furthermore, when the steel-making slag slurry dehydrated to a moisture content of 20% by mass or less is added to the slurry-like steelmaking slag generated by wet magnetic separation for recovering granular iron from the steelmaking slag, the strength of the simple pavement is improved. This is because the steelmaking slag slurry has a very small particle size of 0.1 mm or less, and the calcium contained is more likely to elute than steelmaking slag of 40 mm or less, so in addition to the pozzolanic reaction, calcium and water react to form. This is considered to be because a carbonation reaction in which calcium hydroxide reacts with carbon dioxide in the air and solidifies easily occurs. Therefore, when the wet magnetic separation is possessed and the steelmaking slag slurry is generated, it is desirable to utilize it as a raw material for further strength development.
However, when the steelmaking slag slurry is added in an amount of 30% by mass or more, the fine powder portion is extremely increased and the aggregate is relatively decreased, so that there is a tendency that strength is not exhibited.
さらに、結合材として、ポルトランドセメント，高炉セメント，高炉水砕微粉末のうち１種または２種以上を、全量に対して１．５％重量％以上４．５％重量％以下を加えて施工すると、施工後の養生日数を短くすることができる。これは、これは散水し転圧して施工された後、カルシウムシリケイト水和物(Ｃ−Ｓ−Ｈ)と水酸化カルシウムが生成し初期強度が発現することで、養生時間が短縮可能となる。
ただし、４．５質量％超を加えると、早期に固化することで製鋼スラグ自体の膨張を強く拘束してしまう為、内部応力が高まり、数か月で割れることが懸念される。
Furthermore, when one or two or more of Portland cement, blast furnace cement, and granulated blast furnace powder are added as a binder, 1.5% by weight or more and 4.5% by weight or less are added to the total amount. The curing days after construction can be shortened. This can be done by sprinkling water and rolling and then forming calcium silicate hydrate (C—S—H) and calcium hydroxide to develop initial strength, thereby shortening the curing time.
However, if adding more than 4.5 mass%, the solidification of the steelmaking slag itself is strongly restrained by solidifying at an early stage, so that the internal stress increases and there is a concern that it will crack in several months.
ここで簡易舗装の施工方法を説明する。まず、本発明に係る簡易舗装材料を地盤の上に敷きならす。敷きならす厚みは５０ｍｍから３００ｍｍ厚みであることが好ましい。ここで、敷き均す材料の厚さ（高さ）を５０ｍｍ以上とすることが好ましい理由は、その厚さ（高さ）が５０ｍｍ以下では、固まった後の強度が不足する為である。また３００ｍｍ以下としている理由は、大型のローラロードあるいは小型のプレートでの転圧では、下部まで圧力が行き渡らない為に締め固めが出来ずに、車重の圧力で下部の材料が動き、上部に割れを生じてしまう恐れがあるためである。 Here, a simple pavement construction method will be described. First, the simple pavement material according to the present invention is spread on the ground. The thickness to be spread is preferably 50 mm to 300 mm. Here, the reason why the thickness (height) of the material to be leveled is preferably 50 mm or more is that when the thickness (height) is 50 mm or less, the strength after hardening is insufficient. The reason why it is 300 mm or less is that when rolling with a large roller load or a small plate, the pressure does not reach the bottom, so compaction is not possible, and the material at the bottom moves due to the pressure of the vehicle weight. This is because there is a risk of cracking.
そして、敷きならした簡易舗装材料に水を散布した後、大型のローラロードあるいは小型のプレートで転圧することで、一ヶ月で強固な地盤となり、歩道や乗用車が走行できる程度の作業道路として活用できる道路になる。
ここで、散水量は外添で７質量％以上、３５質量％以下とすることが好ましい。簡易舗装材料に対し外添で７質量％以上としたうえで転圧する理由は、スラグ粒子の表面に水を付着させる必要があるからである。一方、３５質量％を越える量の散水を行った場合は、転圧時に流動化し平面な成形が出来なくなるとともに、転圧し成形が終わった場所に振動が伝播して流動化するために、締め上げが緩んでしまい、強度が発現しなくなる恐れがあるためである。
And after spraying water on the simple pavement material that has been laid, it can be used as a work road that can run on sidewalks and passenger cars by forming a strong ground in one month by rolling with a large roller load or small plate. Become a road.
Here, the amount of water spraying is preferably 7% by mass or more and 35% by mass or less by external addition. The reason why the simple pavement material is rolled after being externally added to 7% by mass or more is that it is necessary to attach water to the surface of the slag particles. On the other hand, when watering of an amount exceeding 35% by mass is performed, fluidization occurs during rolling and flat molding becomes impossible, and vibration is propagated to the place where rolling and molding are finished, and fluidization occurs. This is because there is a possibility that the strength will be loosened and the strength will not be exhibited.
また、散水する水に海水を用いることができる。海水に対するカルシウムの溶解度が水よりも高いことから、製鋼スラグ中のカルシウムの溶出量が上昇するために、高炉水砕スラグのシリカ，アルミナ分と反応してポゾラン反応が促進される。また、海水の代わりに塩化カルシウムを２質量％以上、８質量％以下含有する水でも同じ効果が得られる。
また、振動式の転圧機を用いて転圧することで、製鋼スラグと高炉水砕の締め固めが進む結果、単純な転圧以上により高い強度が発現する。
Moreover, seawater can be used for the water to spray. Since the solubility of calcium in seawater is higher than that of water, the elution amount of calcium in the steelmaking slag is increased, so that the pozzolanic reaction is promoted by reacting with the silica and alumina components of the granulated blast furnace slag. Moreover, the same effect is acquired also with the water which contains calcium chloride 2 mass% or more and 8 mass% or less instead of seawater.
Moreover, as a result of compaction of steelmaking slag and blast furnace granulation by rolling using a vibratory compactor, high strength is manifested by more than simple rolling.
最後に、養生について説明する。混合物への散水、転圧後、１週間から１ヶ月養生することで、ＣＢＲは７０％以上となり、乗用車程度の重量物は、轍が出来ずに問題なく走行できる。 Finally, the curing will be explained. After spraying the mixture, rolling and curing for 1 week to 1 month, the CBR becomes 70% or more, and heavy objects of the size of passenger cars can run without problems without wrinkles.
次に本発明の実施例について説明するが、本発明は、これに限られるものではない。 Next, examples of the present invention will be described, but the present invention is not limited thereto.
（実施例1乃至実施例６）
水浸膨張比が１．５％を超え、６．０％以下で目開き４０ｍｍの篩でふるった粒径４０ｍｍ以下の製鋼スラグに、高炉水砕スラグを５質量％以上、３５質量％以下混合してなる簡易舗装材料について簡易舗装試験を行い、施工の１ヶ月後にキャスポルＣＢＲ％値を測定した。結果を表１の実施例1乃至実施例６に示す。
キャスポルＣＢＲ％値は、７２〜９８を示し良好な簡易舗装であった。これに対し、比較例１は目開き５０ｍｍの篩でふるった製鋼スラグを用いた例であり、製鋼スラグの粒径が大きく、キャスポルＣＢＲ％値は小さく簡易舗装の強度が小さかった。比較例１は、高炉水砕スラグの量が少なく、比較例２乃至比較例１３は、製鋼スラグの水浸膨張比が不適切な場合であり、いずれもキャスポルＣＢＲ％値は小さく簡易舗装の強度が小さかった。尚、使用した製鋼スラグの成分は、ＣａＯ＝４６％，ＳｉＯ２＝１１％，Ｔ−Ｆｅ＝１７％，ＭｇＯ＝７％，ＡＬ２Ｏ３＝２％であった。また、高炉水砕スラグの成分は、ＣａＯ＝４２％，ＳｉＯ２＝３４％，Ｔ−Ｆｅ＝０．４％，ＭｇＯ＝７％，ＡＬ２Ｏ３＝１３％であった。
(Example 1 to Example 6)
Blast furnace granulated slag is mixed in an amount of more than 35% and less than 35% in steelmaking slag with a water immersion expansion ratio of over 1.5% and a particle size of 40 mm or less sieved with a sieve with a mesh opening of 40% or less. A simple pavement test was conducted on the simple pavement material, and the Caspol CBR% value was measured one month after the construction. The results are shown in Examples 1 to 6 in Table 1.
The Caspol CBR% value was 72 to 98 and was a good simple pavement. On the other hand, Comparative Example 1 is an example using steelmaking slag sieved with a sieve having an opening of 50 mm. The particle size of the steelmaking slag was large, the Caspol CBR% value was small, and the strength of the simple pavement was small. Comparative Example 1 is a case where the amount of granulated blast furnace slag is small, and Comparative Examples 2 to 13 are cases in which the water immersion expansion ratio of the steelmaking slag is inappropriate. In all cases, the Caspol CBR% value is small and the strength of the simple pavement. Was small. The steelmaking slag components used were CaO = 46%, SiO2 = 11%, T-Fe = 17%, MgO = 7%, AL2O3 = 2%. The components of the granulated blast furnace slag were CaO = 42%, SiO2 = 34%, T-Fe = 0.4%, MgO = 7%, AL2O3 = 13%.
（実施例７乃至実施例８）
請求項２に係る発明の効果を確認するため、湿式磁力選別で排出された製鋼スラグスラリーを混合する試験を行った。結果を表２に示す。実施例７及び実施例８では、キャスポルＣＢＲ％が大幅に向上した。製鋼スラグスラリーの平均粒径は０．０３ｍｍで、含水率は約３０％のものを用いた。また、化学成分は、ＣａＯ＝３９％，ＳｉＯ２＝８％，Ｔ−Ｆｅ＝１２％，ＭｇＯ＝４％，ＡＬ２Ｏ３＝４％であった。
(Example 7 to Example 8)
In order to confirm the effect of the invention according to claim 2, a test for mixing the steelmaking slag slurry discharged by the wet magnetic sorting was performed. The results are shown in Table 2. In Example 7 and Example 8, Caspol CBR% was significantly improved. The steelmaking slag slurry had an average particle size of 0.03 mm and a water content of about 30%. The chemical components were CaO = 39%, SiO2 = 8%, T-Fe = 12%, MgO = 4%, AL2O3 = 4%.
（実施例９乃至実施例１５）
請求項５に係る発明の効果を確認するため、施工時に散布する水の種類を変更する実験を行った。実施結果を表３に示す。実施例９乃至実施例１１は塩化カルシウムを水に含有させた場合、実施例１２及び実施例１３は海水を散布した場合である。いずれもキャスポルＣＢＲ％値は良好であった。実施例１４及び実施例１５は、塩化カルシウムの含有量が請求項５の要件を外れると、キャスポルＣＢＲ％値は若干、低下した。
(Example 9 to Example 15)
In order to confirm the effect of the invention according to
（実施例１６乃至実施例２４）
請求項３に係る発明の効果を確認するため、結合材として、ポルトランドセメント，高炉セメント，高炉水砕微粉末のうち１種または２種以上を加えて試験施工した結果を表４に示す。養生期間の短縮効果を確認するために、散水し転圧して施工した３日後にキャスポルＣＢＲ％を測定した。結合材を加えると表４に示すように６０％以上の強度発現が得られ、施工後３日目に乗用車を通行させても、轍跡もつかなかった。
一方、実施例２０の場合で、結合材を加えない場合は、散水し転圧して施工した３日後のキャスポルＣＢＲ％は、５５％にとどまった。
又、結合材を４．５％質量％を超えた場合は、施工後３日目のＣＢＲ％は、６０％を超えたが、数か月で、試験施工した場所に割れが発生してしまった。
従って、結合材は、１．５質量％以上、４．５質量％以下であることが好ましい。
(Examples 16 to 24)
In order to confirm the effect of the invention according to claim 3, Table 4 shows the results of test construction by adding one or more of Portland cement, blast furnace cement, and granulated blast furnace powder as binders. In order to confirm the shortening effect of the curing period, Caspol CBR% was measured 3 days after watering, rolling and construction. When the binder was added, a strength expression of 60% or more was obtained as shown in Table 4, and even if the passenger car was passed on the third day after the construction, no trace was left.
On the other hand, in the case of Example 20, when no binder was added, the Caspol CBR% after 3 days of sprinkling and rolling was only 55%.
In addition, when the binder content exceeds 4.5% by mass, the CBR% on the third day after the construction exceeded 60%, but cracks occurred at the test site in several months. It was.
Therefore, the binder is preferably 1.5% by mass or more and 4.5% by mass or less.
林道、駐車場その他の簡易舗装において、簡易舗装材料を提供し、簡易舗装方法に利用することができる。 In forest roads, parking lots and other simple pavements, simple pavement materials can be provided and used for simple pavement methods.
Claims (6)
前記高炉水砕スラグの全量に対する含有量が５質量％以上、３５質量％以下であることを特徴とする簡易舗装材料。 A simple pavement material obtained by mixing steelmaking slag having a water immersion expansion ratio exceeding 1.5% and not more than 6.0% and having a particle diameter of 40 mm or less and blast furnace granulated slag,
Content with respect to the whole quantity of the said blast-furnace granulated slag is 5 mass% or more and 35 mass% or less, The simple pavement material characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011169604A JP5765125B2 (en) | 2010-08-03 | 2011-08-02 | Simple paving material and simple paving method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010174824 | 2010-08-03 | ||
| JP2010174824 | 2010-08-03 | ||
| JP2011169604A JP5765125B2 (en) | 2010-08-03 | 2011-08-02 | Simple paving material and simple paving method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2012052408A true JP2012052408A (en) | 2012-03-15 |
| JP5765125B2 JP5765125B2 (en) | 2015-08-19 |
Family
ID=45906016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2011169604A Active JP5765125B2 (en) | 2010-08-03 | 2011-08-02 | Simple paving material and simple paving method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5765125B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452513A (en) * | 2013-09-18 | 2015-03-25 | 大地亮环保服务有限公司 | Application of washable blast furnace slag in manufacturing farmland sidewalk pavement and farmland sidewalk pavement |
| JP2016000919A (en) * | 2014-06-11 | 2016-01-07 | 新日鐵住金株式会社 | Simple pavement body |
| JP2016000918A (en) * | 2014-06-11 | 2016-01-07 | 新日鐵住金株式会社 | Simple pavement material |
| JP2017048625A (en) * | 2015-09-03 | 2017-03-09 | 新日鐵住金株式会社 | Simple paving method |
| JP2017061815A (en) * | 2015-09-25 | 2017-03-30 | 新日鐵住金株式会社 | Simple pavement body manufacturing method |
| JP2017137624A (en) * | 2016-02-01 | 2017-08-10 | 新日鐵住金株式会社 | Browning method for slag-based civil engineering material, and construction method for low-cost pavement road |
| JP2018150788A (en) * | 2017-03-09 | 2018-09-27 | Ｊｆｅスチール株式会社 | Aggregate for asphalt and asphalt pavement |
| JP2020041318A (en) * | 2018-09-10 | 2020-03-19 | 日本製鉄株式会社 | Climate adaptive paving method |
| KR20230055107A (en) * | 2021-10-18 | 2023-04-25 | 한국철도기술연구원 | Method for constructing embankment structure of railway concrete track |
| JP7415231B2 (en) | 2021-08-20 | 2024-01-17 | Ｊｆｅスチール株式会社 | Ground covering material and its manufacturing method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7028038B2 (en) * | 2018-04-16 | 2022-03-02 | 日本製鉄株式会社 | How to repair a simple pavement |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63247467A (en) * | 1987-03-31 | 1988-10-14 | 川崎製鉄株式会社 | Floor surface paving construction method of warehouse or yard |
| JPH01207501A (en) * | 1988-02-16 | 1989-08-21 | Kobe Steel Ltd | Simplified pavement material and simplified pavement construction |
| JPH02248507A (en) * | 1989-03-22 | 1990-10-04 | Sumitomo Metal Ind Ltd | Rolled concrete paving material and paving method thereof |
| JPH02266005A (en) * | 1989-04-06 | 1990-10-30 | Nippon Steel Corp | Hydraulic surface paving method |
| JPH04349153A (en) * | 1991-05-24 | 1992-12-03 | Godo Seitetsu Kk | Hydraulic composite subbase course material |
| JPH09273105A (en) * | 1996-04-08 | 1997-10-21 | Nippon Cement Co Ltd | Cast-in-place water permeable concrete pavement and its execution method |
| JP2005256387A (en) * | 2004-03-11 | 2005-09-22 | Ybk Kogyo:Kk | Natural pavement, paving material and paving method for natural pavement |
| JP2007120184A (en) * | 2005-10-28 | 2007-05-17 | Jfe Steel Kk | Slag for low-cost pavement, low-cost pavement body, slag for civil engineering, and civil engineering working body |
-
2011
- 2011-08-02 JP JP2011169604A patent/JP5765125B2/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63247467A (en) * | 1987-03-31 | 1988-10-14 | 川崎製鉄株式会社 | Floor surface paving construction method of warehouse or yard |
| JPH01207501A (en) * | 1988-02-16 | 1989-08-21 | Kobe Steel Ltd | Simplified pavement material and simplified pavement construction |
| JPH02248507A (en) * | 1989-03-22 | 1990-10-04 | Sumitomo Metal Ind Ltd | Rolled concrete paving material and paving method thereof |
| JPH02266005A (en) * | 1989-04-06 | 1990-10-30 | Nippon Steel Corp | Hydraulic surface paving method |
| JPH04349153A (en) * | 1991-05-24 | 1992-12-03 | Godo Seitetsu Kk | Hydraulic composite subbase course material |
| JPH09273105A (en) * | 1996-04-08 | 1997-10-21 | Nippon Cement Co Ltd | Cast-in-place water permeable concrete pavement and its execution method |
| JP2005256387A (en) * | 2004-03-11 | 2005-09-22 | Ybk Kogyo:Kk | Natural pavement, paving material and paving method for natural pavement |
| JP2007120184A (en) * | 2005-10-28 | 2007-05-17 | Jfe Steel Kk | Slag for low-cost pavement, low-cost pavement body, slag for civil engineering, and civil engineering working body |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452513A (en) * | 2013-09-18 | 2015-03-25 | 大地亮环保服务有限公司 | Application of washable blast furnace slag in manufacturing farmland sidewalk pavement and farmland sidewalk pavement |
| JP2016000919A (en) * | 2014-06-11 | 2016-01-07 | 新日鐵住金株式会社 | Simple pavement body |
| JP2016000918A (en) * | 2014-06-11 | 2016-01-07 | 新日鐵住金株式会社 | Simple pavement material |
| JP2017048625A (en) * | 2015-09-03 | 2017-03-09 | 新日鐵住金株式会社 | Simple paving method |
| JP2017061815A (en) * | 2015-09-25 | 2017-03-30 | 新日鐵住金株式会社 | Simple pavement body manufacturing method |
| JP2017137624A (en) * | 2016-02-01 | 2017-08-10 | 新日鐵住金株式会社 | Browning method for slag-based civil engineering material, and construction method for low-cost pavement road |
| JP2018150788A (en) * | 2017-03-09 | 2018-09-27 | Ｊｆｅスチール株式会社 | Aggregate for asphalt and asphalt pavement |
| JP2020041318A (en) * | 2018-09-10 | 2020-03-19 | 日本製鉄株式会社 | Climate adaptive paving method |
| JP7147394B2 (en) | 2018-09-10 | 2022-10-05 | 日本製鉄株式会社 | Climate-adaptive pavement method |
| JP7415231B2 (en) | 2021-08-20 | 2024-01-17 | Ｊｆｅスチール株式会社 | Ground covering material and its manufacturing method |
| KR20230055107A (en) * | 2021-10-18 | 2023-04-25 | 한국철도기술연구원 | Method for constructing embankment structure of railway concrete track |
| KR102630276B1 (en) | 2021-10-18 | 2024-01-29 | 한국철도기술연구원 | Method for constructing embankment structure of railway concrete track |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5765125B2 (en) | 2015-08-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5765125B2 (en) | Simple paving material and simple paving method | |
| US6869473B2 (en) | Cementicious materials including stainless steel slag and geopolymer | |
| JP4696851B2 (en) | Simple paving slag and simple paving body, civil engineering slag and civil engineering construction body | |
| KR101795570B1 (en) | Urgently Repair Material of Road Using Silicon Manganese Slag and Repairing Method Using the Same | |
| JP5975603B2 (en) | High-strength porous concrete composition and high-strength porous concrete cured body | |
| JP2015175175A (en) | Civil engineering material and manufacturing method thereof | |
| JPH0813413A (en) | Improvement method for poor subgrade soil | |
| JP5812623B2 (en) | High-strength porous concrete composition and high-strength porous concrete cured body | |
| JP6938934B2 (en) | Ground improvement method using steelmaking slag and ground construction method using steelmaking slag | |
| US6793851B1 (en) | Process for manufacturing infrastructures based on vitrified blast-furnace slag and additive used | |
| JP4850777B2 (en) | Method for producing steelmaking slag solidified body, and steelmaking slag solidified body | |
| JP5668634B2 (en) | Expanded controlled steel slag hydrated solid artificial stone and method for producing the same | |
| JP2006222104A (en) | Electromagnetic wave absorbing composition | |
| JP2002146709A (en) | Water permeable base material utilizing reclaimed aggregate | |
| JP5668640B2 (en) | Steel slag roadbed material and method of manufacturing steel slag roadbed material | |
| JP2578692B2 (en) | Permeable roadbed material and permeated roadbed construction method | |
| CN113668309A (en) | Road construction method | |
| JP3072423B2 (en) | Manufacturing method of high-strength artificial aggregate | |
| KR100789877B1 (en) | Manufacturing methods of recyclable inorganic composities with sandy loam for light weight pavement and manufacturing method of pavement using the same | |
| JP5857995B2 (en) | Manufacturing method of artificial stone | |
| JP2001114549A (en) | Water-permeable solid material and method for producing the same | |
| JP3826899B2 (en) | High gap roadbed material and semi-rigid roadbed method | |
| JP7028038B2 (en) | How to repair a simple pavement | |
| JPH0393657A (en) | Hydraulic paving material | |
| JP2010133090A (en) | Soil paving material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20130812 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20140312 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20140415 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20140609 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20141209 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20150130 |
|
| 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: 20150519 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20150601 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 5765125 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |