JP4452780B2 - Ground and roadbed improvement material by mixing rock sludge, waste molten slag and stabilizer. - Google Patents
Ground and roadbed improvement material by mixing rock sludge, waste molten slag and stabilizer. Download PDFInfo
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- JP4452780B2 JP4452780B2 JP2008165259A JP2008165259A JP4452780B2 JP 4452780 B2 JP4452780 B2 JP 4452780B2 JP 2008165259 A JP2008165259 A JP 2008165259A JP 2008165259 A JP2008165259 A JP 2008165259A JP 4452780 B2 JP4452780 B2 JP 4452780B2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Description
本発明は、都市ゴミの溶融施設から排出される溶融物を粉砕したゴミ溶融スラグと粉砕した岩ズリを利用した地盤および路盤改良材に関する。 TECHNICAL FIELD The present invention relates to a ground and roadbed improvement material using crushed molten slag obtained by pulverizing a melt discharged from a municipal waste melting facility and crushed rock sludge.
従来、都市ゴミの溶融施設から排出される溶融物を微粉砕したゴミ溶融スラグと消石灰の混合による路盤改良材が知られている（特許文献１を参照）。
この公知技術では、都市ゴミの溶融施設から排出される溶融物を急冷凝固した後、微粉砕した粒径４２５〜１０μｍの範囲のゴミ溶融スラグ５０重量％と土材料５０重量％とからなる混合土に消石灰５〜１５重量％添加した路盤改良材である。
その他に都市ごみの焼却灰の再利用に着目し、地下水位が高く緩い砂質土地盤の液状化防止用の地盤改良材が知られている（特許文献２を参照）。
この公知技術では、前記地盤改良材は、都市ごみの焼却灰を溶融して得られたスラグと、硬焼生石灰と、セメントと、透水性材料と、石膏を適宜配合した組成からなるものである。
一般に、対象となる土に対して、生石灰、消石灰、セメントなどの安定材を添加して改良を行っている。安定材を添加して処理した土、すなわち安定処理土の効果は、通常、水の存在の元に、安定材がそれ自身及び土粒子との間で化学反応して水和物を生成し、これが未反応の土粒子・安定材の間隙を埋めることによってなされる。
In this known technique, a melt discharged from a municipal waste melting facility is rapidly cooled and solidified, and then mixed ground consisting of 50% by weight of waste molten slag having a particle size of 425 to 10 μm and 50% by weight of soil material. It is a roadbed improvement material which added 5 to 15% by weight of slaked lime.
In addition, paying attention to the reuse of incineration ash from municipal waste, ground improvement materials for preventing liquefaction of loose sandy ground with high groundwater level are known (see Patent Document 2).
In this known technique, the ground improvement material is composed of a composition in which slag obtained by melting incineration ash of municipal waste, hard calcined lime, cement, water-permeable material, and gypsum are appropriately blended. .
In general, the target soil is improved by adding a stabilizer such as quicklime, slaked lime, or cement. The effect of the soil treated with the addition of the stabilizer, i.e., the stabilized soil, is usually the result of the chemical reaction between the stabilizer itself and the soil particles in the presence of water to form a hydrate, This is done by filling the gap between unreacted soil particles and stabilizer.
本発明は、都市ゴミの溶融施設から排出される溶融物を粒径２５０μｍ以下に微粉砕したゴミ溶融スラグと粒径２５０μｍ以下に微粉砕した岩ズリ（採石場で発生する廃石）の混合土の重量に対して消石灰またはセメントの混合による、実用上十分な圧縮強度を得る地盤及び路盤改良材を提供することを目的とする。
The present invention is a mixed soil of waste molten slag obtained by finely pulverizing a melt discharged from a municipal waste melting facility to a particle size of 250 μm or less and rock sludge (wastestone generated at a quarry) pulverized to a particle size of 250 μm or less. An object of the present invention is to provide a ground and roadbed improvement material that obtains a practically sufficient compressive strength by mixing slaked lime or cement with respect to the weight of the base.
本発明のゴミ溶融スラグは、都市ゴミの溶融施設から排出される溶融物を急冷凝固した後、微粉砕した粒径２５０μｍ以下のゴミ溶融スラグ２５重量％以上と微粉砕した粒径２５０μｍ以下の岩ズリとからなる混合土の重量に対して消石灰５〜１５重量％またはセメント２〜１０重量％を添加したものである。
The molten slag of the present invention is a rock having a particle size of 250 μm or less and a finely pulverized rock having a particle size of 250 μm or less and a finely pulverized particle molten slag of 25 μm or less after the melt discharged from the municipal waste melting facility is rapidly solidified. 5 to 15% by weight of slaked lime or 2 to 10% by weight of cement is added with respect to the weight of the mixed soil consisting of sludge.
一般住宅地の地盤に要求される地耐力は３０〜５０ｋN/m2であるから、本発明の微粉砕した岩ズリ７５重量％とゴミ溶融スラグ２５重量％の配合のみで８０ｋN/m2の強度が得られる。このことから、一般住宅用の建設に際して、地耐力のない地盤に十分地盤改良材として活用できる。 Since bearing capacity required of the residential areas of the ground is 30~50kN / m 2, the strength of 80 kN / m 2 only in the formulation of milled rock shear 75 wt% and waste slag 25% by weight of the present invention Is obtained. For this reason, it can be used as a ground improvement material enough for ground with no earth resistance in the construction of ordinary houses.
本発明の微粉砕したゴミ溶融スラグと岩ズリと安定材の混合による地盤および路盤改良材は、微粉砕したゴミ溶融スラグと岩ズリの混合土が微粉砕による比表面積の増加と、これに伴う潜在水硬性が発揮され、強度が増大する。
微粉砕したゴミ溶融スラグと岩ズリ、さらに安定材として消石灰およびセメントを添加した混合土は、スラグの潜在水硬性と消石灰およびセメントによる硬化が複合的に発揮され、とりわけ微粉砕粒径２５０μｍでは、上層路盤、下層路盤さらに路床の改良に、十分活用できる。
特に経済性の観点から、消石灰を添加したケースについて要求される下層路盤の強度(700kN/m2)を検討すると消石灰の添加率５重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間１０日以上であれば十分下層路盤材として適用できる。
さらに消石灰の添加率５重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間１５日以上であれば十分上層路盤材として適用できる。
The ground and roadbed improvement material by mixing pulverized refuse molten slag, rock sludge and stabilizer according to the present invention is accompanied by an increase in specific surface area due to fine pulverization of the mixed soil of finely divided trash molten slag and rock sludge. The latent hydraulic property is exhibited and the strength is increased.
The mixed soil with finely pulverized waste molten slag and rock slurries, and further added with slaked lime and cement as stabilizers, exhibits combined slag latent hydraulic properties and hardening with slaked lime and cement. It can be fully used to improve upper and lower roadbeds and lower roadbeds.
In particular, from the economical point of view, the strength of the lower roadbed (700kN / m 2 ) required for the case where slaked lime is added is examined. The addition rate of slaked lime is 5% by weight or more, and slag is 25% by weight or more by the combination of slag and rock sludge. In addition, if the curing period is 10 days or more, it can be applied as a lower layer roadbed material.
Furthermore, if the addition rate of slaked lime is 5% by weight or more, and the slag is mixed with rock sludge and the slag is 25% by weight or more, and the curing period is 15 days or more, it can be sufficiently applied as an upper roadbed material.
一方セメントを添加したケースについて、下層路盤の強度(980kN/m2)を検討すると、セメントの添加率２重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間１０日以上であれば十分下層路盤材として適用できる。
さらに上層路盤の強度(2900kN/m2)を検討すると、セメントの添加率５重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間７日程度で上層路盤材として適用できる。
On the other hand, in the case where cement was added, the strength of the lower roadbed (980 kN / m 2 ) was examined. The cement addition rate was 2% by weight or more, and the slag and rock sludge blending was 25% by weight or more, and the curing period was 10 days or more. If it is sufficient, it can be applied as a lower layer roadbed material.
Furthermore, when the strength of the upper roadbed (2900kN / m 2 ) is studied, it can be applied as an upper roadbed material with a cement addition rate of 5% by weight or more, a slag and rock sludge composition of 25% by weight or more, and a curing period of about 7 days. .
本発明の微粉砕したゴミ溶融スラグと岩ズリと安定材の混合による地盤および路盤改良材について、以下に説明する。
一般家庭や事業所から排出される可燃性ゴミは、各自治体の焼却施設により焼却処分されているが、近年ダイオキシン等の除去のため、高温還元雰囲気１８００℃の高温で焼却する溶融炉、例えばシャフト炉式ガス化溶融炉で多様なゴミを溶融するようになっている。
このような都市ゴミの溶融施設から排出される溶融物は、年間数万トンも排出され、
その再資源化が望まれている。
本発明は、この溶融施設から排出されるゴミ溶融スラグを微粉砕することによって生じる潜在水硬性に着目し、これに砕石場で発生する微粉砕した岩ズリを混合し、さらに安定材を添加して地盤および路盤改良材を生成して安定処理を行い、改質を図るものである。
The ground and roadbed improvement material by mixing finely pulverized waste molten slag, rock sludge and stabilizer according to the present invention will be described below.
Combustible waste discharged from ordinary households and business establishments is incinerated by local government incineration facilities. Recently, in order to remove dioxins, etc., a melting furnace, for example, a shaft, is incinerated at a high temperature of 1800 ° C in a high temperature reducing atmosphere. Various types of garbage are melted in a furnace-type gasification melting furnace.
Tens of thousands of tons of molten material discharged from such municipal waste melting facilities are discharged annually,
The recycling is desired.
The present invention pays attention to the latent hydraulic property generated by finely pulverizing the waste molten slag discharged from this melting facility, and this is mixed with finely pulverized rock sludge generated in a quarry, and further added with a stabilizer. Thus, the ground and the roadbed improvement material are generated and subjected to a stabilization process for reforming.
ゴミ溶融スラグ
使用したスラグは秋田市総合環境センターの溶融施設からの排出されたゴミ溶融スラグであり、物理的性質および化学成分を表１、表２に示す。またスラグ単体による溶出量試験と含有量試験の結果は、いずれも土壌環境基準を満たしている。
Waste melting slag The used slag is the waste melting slag discharged from the melting facility of Akita City Environmental Center. Tables 1 and 2 show the physical properties and chemical composition. In addition, the results of the dissolution test and content test using slag alone satisfy the soil environmental standards.
岩ズリ
使用した岩ズリは秋田県男鹿市寒風山の採石場で採取したものでその物理的性質および化学成分を表３、表４に示す。
Rock sludge The rock slurries used were collected at a quarry in Mt. Kanfu, Oga City, Akita Prefecture, and their physical properties and chemical composition are shown in Tables 3 and 4.
社団法人日本道路協会、舗装施工便覧によると、下層路盤は各路盤材を所定の仕上がり厚さが得られるように均一に敷きならし、所定の締固め度が得られるまで締め固め、かつ所定の形状に平坦に仕上げるものである。
下層路盤の築造工法には、粒状路盤工法、セメント安定処理工法及び石灰安定処理工法があり、セメント安定処理の一軸圧縮強さの基準が９８０ｋＮ／ｍ２（０．９８ＭＰａ）、石灰安定処理の一軸圧縮強さの基準が７００ｋＮ／ｍ２（０．７０ＭＰａ）である。
なお、養生期間はセメント安定処理では７日、石灰安定処理で１０日である。
According to the Japan Road Association, the pavement construction manual, the lower roadbed is laid out uniformly so that each roadbed material has a predetermined finish thickness, and is compacted until a predetermined degree of compaction is obtained. The shape is finished flat.
For the construction method of the lower roadbed, there are a granular roadbed method, a cement stabilization method and a lime stabilization method, the standard of uniaxial compressive strength of cement stabilization is 980 kN / m 2 (0.98 MPa), and the axis of lime stabilization The standard of compressive strength is 700 kN / m 2 (0.70 MPa).
The curing period is 7 days for cement stabilization treatment and 10 days for lime stabilization treatment.
溶融施設から直接排出されるゴミ溶融スラグと岩ズリにより供試体(直径５ｃｍ、高さ１０ｃｍ)を作成し、実施した試験はすべて一軸圧縮試験であって、以下の４種類の実験条件に基づいて行った。なお、供試体は３層に分け、各層２５回ずつ突固めたものである。また、ゴミ溶融スラグおよび岩ズリはすべて微粉砕し、粒径２５０μｍとした。
１）岩ズリとゴミ溶融スラグの混合土による一軸圧縮試験。
岩ズリとスラグの混合割合をそれぞれ乾燥重量比で２５、５０、７５重量％とした無添加の一軸圧縮試験を行う。
２）岩ズリとゴミ溶融スラグの混合土に消石灰を添加し、所定の養生期間後の一軸圧縮試験。
岩ズリとスラグの混合割合をそれぞれ乾燥重量比で、２５、５０、７５重量％とした。また消石灰の添加率はそれぞれ５、１０、１５重量％とし、これらの添加した混合土に対してそれぞれ養生期間を３、７、１０、２８、９０日とした。
３) 岩ズリとゴミ溶融スラグの混合土にセメントを添加し、所定の養生期間後の一軸圧縮試験。
岩ズリとスラグの混合割合をそれぞれ乾燥重量比で２５、５０、７５重量％とした。またセメントの添加率はそれぞれ２、５、１０重量％とし、これらの添加した混合土に対してそれぞれ養生期間を１、３、７、２８、９０日とした。
The specimens (diameter 5cm, height 10cm) were made from waste molten slag and rock sludge discharged directly from the melting facility, and all the tests conducted were uniaxial compression tests, based on the following four types of experimental conditions. went. The specimen was divided into three layers and each layer was rammed 25 times. Moreover, all the dust melting slag and rock sludge were finely pulverized to a particle size of 250 μm.
1) Uniaxial compression test using mixed soil of rock sludge and waste molten slag.
An additive-free uniaxial compression test in which the mixing ratio of rock sludge and slag is 25, 50, and 75% by weight in dry weight ratio, respectively, is performed.
2) A uniaxial compression test after a predetermined curing period in which slaked lime is added to the mixed soil of rock sludge and waste molten slag.
The mixing ratio of rock sludge and slag was 25, 50, and 75% by weight in terms of dry weight. The addition rate of slaked lime was 5, 10, and 15% by weight, respectively, and the curing period was 3, 7, 10, 28, and 90 days, respectively, for the added mixed soil.
3) Cement is added to the mixed soil of rock sludge and waste molten slag, and a uniaxial compression test after a predetermined curing period.
The mixing ratio of rock sludge and slag was 25, 50, and 75% by weight, respectively. Moreover, the addition rate of cement was set to 2, 5, and 10% by weight, respectively, and the curing period was set to 1, 3, 7, 28, and 90 days, respectively, for the added mixed soil.
図１〜２は、一例として岩ズリとスラグの混合割合５０重量％の混合土であって、これらに安定材として消石灰５〜１５重量％およびセメント２〜１０重量％をそれぞれ添加し、養生２８日のケースについて、一軸圧縮試験おける応力と軸ひずみの関係を示したものである。またこれらの図には同じ混合割合での無処理の混合土についても併示している。 FIGS. 1 and 2 show, as an example, a mixed soil having a mixing ratio of rock sludge and slag of 50% by weight, to which 5 to 15% by weight of slaked lime and 2 to 10% by weight of cement are added, respectively. The relationship between stress and axial strain in the uniaxial compression test is shown for the day case. These figures also show untreated mixed soil at the same mixing ratio.
図１から分かるように、消石灰の添加率が多いほど強度発現が大きく、消石灰５重量％と１５重量％の添加率で強度を比較すると、消石灰１５重量％添加率の方が４倍程度も増加することが認められる。また図２で示されるように、セメント添加のケースでは図１と同様な傾向が認められる。さらに、安定材として添加した消石灰とセメ
ントについて、同じ添加率１０重量％で強度比較を行うとセメントを混合した混合土では消石灰の混合土と比べて２．４倍程度の強度差がみられる。しかしながら、かならずしも強度のみに注目して混合材料の良否を判断すべきではなく現場の環境や要求される設計強度に対応すべきものと考えられる。
As can be seen from FIG. 1, the greater the slaked lime addition rate, the greater the strength development. When comparing the strength with the addition rate of 5% by weight and 15% by weight of slaked lime, the addition rate of 15% by weight of slaked lime increases about 4 times Is allowed to do. Further, as shown in FIG. 2, the same tendency as in FIG. 1 is observed in the case of cement addition. Furthermore, when comparing the strength of slaked lime and cement added as stabilizers at the same addition rate of 10% by weight, the mixed soil mixed with cement shows a strength difference of about 2.4 times compared to the mixed soil of slaked lime. . However, it is considered that the quality of the mixed material should not be judged by paying attention only to the strength, but should correspond to the on-site environment and the required design strength.
図３〜６は、岩ズリとゴミ溶融スラグを３種類の混合割合で混合した材料に消石灰およびセメントを添加し、２８日および９０日の長期養生期間毎に示したものである。これらの試験結果から分かるように、スラグの含有割合が大きいほど、また消石灰およびセメントの添加率が増加に伴って強度が増大する傾向が認められる。これは、安定材の他に微粉砕することによってスラグ自体の潜在水硬性が大きく関与しているものと考えられる。 3 to 6 show slaked lime and cement added to a material obtained by mixing rock sludge and waste molten slag at three kinds of mixing ratios, and are shown for each 28-day and 90-day long-term curing period. As can be seen from these test results, there is a tendency that the strength increases as the content ratio of slag increases and the addition ratio of slaked lime and cement increases. It is considered that this is because the latent hydraulic properties of the slag itself are greatly involved by pulverizing in addition to the stabilizer.
図３の消石灰および図５のセメント添加率１０重量％を基準にして、長期養生期間毎に強度を比較すると、養生期間２８日では顕著な強度の相違が認められるが、養生期間９０日程度(図４、６)になると、さほど大きな強度差は見られないようである。
したがって、長期的な環境問題を考慮すると混合材料に添加する安定材として、消石灰は環境に対する負荷が最も少ないものと考えられる。
When the strength is compared for each long-term curing period based on the slaked lime in FIG. 3 and the cement addition rate of 10% by weight in FIG. 5, a remarkable difference in strength is recognized in the curing period of 28 days, but the curing period is about 90 days ( In FIGS. 4 and 6), it seems that no significant difference in intensity is observed.
Therefore, considering long-term environmental problems, slaked lime is considered to have the least environmental impact as a stabilizer added to the mixed material.
図７〜１２は、岩ズリとゴミ溶融スラグを３種類の混合割合で混合した材料に所定の消石灰およびセメントを添加し、強度と養生期間の関係を示したものである。図７〜９において３種類の混合土にそれぞれ消石灰５、１０、１５重量％を添加した一軸圧縮強度quと養生期間の関係を示したものであって、これらの図から分かるようにいずれも養生期間の増加に伴って強度はほぼ比例的に増大する傾向を示す。また、これらの傾向はスラグの配合が多いほど強度が大きくなることが認められる。これは、微粉砕することによってスラグ自体の潜在水硬性が大きく関与しているものと考えられる。
図１０〜１２は３種類の混合土にそれぞれセメント２、５、１０重量％を添加した一軸圧縮強度quと養生期間の関係を示したものである。前述した消石灰の添加における強度と養生日数の関係と同様な傾向を示す。
FIGS. 7 to 12 show the relationship between strength and curing period by adding predetermined slaked lime and cement to a material obtained by mixing rock sludge and waste molten slag at three mixing ratios. 7 to 9 show the relationship between the uniaxial compressive strength qu obtained by adding slaked lime 5, 10, and 15% by weight to three types of mixed soil, respectively, and the curing period. As can be seen from these figures, both are cured. As the period increases, the intensity tends to increase almost proportionally. Moreover, it is recognized that these tendencies increase as the slag content increases. It is considered that this is because the latent hydraulic properties of the slag itself are greatly involved by pulverizing.
10 to 12 show the relationship between the uniaxial compressive strength qu obtained by adding cement of 2, 5 and 10% by weight to three kinds of mixed soils and the curing period, respectively. It shows the same tendency as the relationship between the strength and the number of days of curing in the addition of slaked lime described above.
図１３〜１４は、岩ズリ２５重量％とゴミ溶融スラグ７５重量％の混合割合で混合した材料に所定の消石灰およびセメントを添加し、長期養生期間における強度の推移を示したものである。これらの図から分かるように、これらの強度は上記の配合割合で長期養生を実施することによって安定材の種類にかかわらず、強度差は小さい。したがって、長期的な環境問題を考慮すると環境に対して負荷が小さい消石灰を添加して地盤の改良を行うべきものと考えられる。 FIGS. 13 to 14 show the transition of strength during a long-term curing period when predetermined slaked lime and cement are added to a material mixed at a mixing ratio of 25% by weight of rock sludge and 75% by weight of waste molten slag. As can be seen from these figures, the strength difference between these strengths is small regardless of the type of the stabilizer by carrying out long-term curing at the above-mentioned blending ratio. Therefore, considering long-term environmental problems, it is considered that the ground should be improved by adding slaked lime that has a low impact on the environment.
上記の結果から経済性を考慮して地盤および路盤材料としてこれらの混合土が適用
できるかどうか検証してみる。
まず、一般住宅地の地盤の地耐力について検討してみると、地盤の要求される強度は３０〜５０ｋN/m2であるから、微粉砕した岩ズリ７５重量％とゴミ溶融スラグ２５重量％の配合のみで十分地盤の強度(80ｋN/m2)が確保できる（図７の岩ズリ75重量％とゴミ溶融スラグ２５重量％の配合で消石灰０重量％を参照）。
次に、消石灰を添加したケースについて、要求される下層路盤の強度(700kN/m2)を検討すると、消石灰の添加率５重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間１０日以上であれば、十分下層路盤材料として適用できる。さらに上層路盤の強度(980kN/m2)を検討すると、消石灰の添加率５重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間１５日程度で上層路盤材料として適用できる。
Based on the above results, we will examine whether these mixed soils can be applied as ground and roadbed materials in consideration of economic efficiency.
First, considering the ground strength of the ground in general residential areas, the required strength of the ground is 30-50 kN / m 2 , so 75% finely ground rock sludge and 25% waste molten slag A sufficient ground strength (80 kN / m 2 ) can be ensured by blending alone (refer to 0 wt% slaked lime with 75 wt% rock sludge and 25 wt% waste molten slag in FIG. 7).
Next, for the case where slaked lime is added, the required strength (700 kN / m 2 ) of the lower layer subbase is examined. The addition rate of slaked lime is 5% by weight or more, and the slag and rock sludge is mixed, and the slag is 25% by weight or more. If it is a curing period of 10 days or more, it can be applied as a lower layer roadbed material. Furthermore, when the strength of the upper roadbed (980 kN / m 2 ) is examined, it can be applied as an upper roadbed material in an addition rate of slaked lime of 5% by weight or more, a slag and rock sludge composition of 25% by weight or more, and a curing period of about 15 days. .
一方、セメントを添加したケースについて、要求される下層路盤の強度(980kN/m2)を検討すると、セメントの添加率２重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間１０日以上であれば、十分下層路盤材料として適用できる。さらに上層路盤の強度(2900kN/m2)を検討すると、セメントの添加率５重量％以上およびスラグと岩ズリの配合でスラグ２５重量％以上、かつ養生期間7日程度で上層路盤材料として適用できる。 On the other hand, considering the required strength of the subbase (980kN / m 2 ) for the case where cement was added, the addition rate of cement was 2% by weight or more, and the slag was mixed with slag and rock sludge, and the slag was 25% by weight or more. If the period is 10 days or more, it can be applied as a lower layer roadbed material. When the strength of the upper roadbed (2900kN / m 2 ) is examined, it can be applied as an upper roadbed material with a cement addition rate of 5% by weight or more, a slag and rock sludge composition of 25% by weight or more, and a curing period of about 7 days. .
表５、６に環境評価として微粉砕前のスラグ単体と、微粉砕した混合材料(消石灰およびセメント添加)の含有量試験および溶出量試験の結果を示す。スラグ含有の重金属など特定有害物質については土壌環境基準が適用されており、含有量試験(環告19号、1M塩酸抽出)は直接摂食のリスク判定、溶出量試験(環告46号、純水への溶出)は土壌や水系汚染を評価対象とするが、鉛とカドミウムおよび六価クロムについて環境基準に合格できることが確認された。 Tables 5 and 6 show the results of content tests and dissolution tests of the slag alone before pulverization and the pulverized mixed material (added with slaked lime and cement) as environmental evaluations. Soil environmental standards are applied to specific hazardous substances such as heavy metals containing slag, and content tests (announcement No. 19, 1M hydrochloric acid extraction) are directly risk assessment of food intake, elution amount test (announcement No. 46, pure net Elution into water) was evaluated for soil and water pollution, but it was confirmed that it can pass environmental standards for lead, cadmium and hexavalent chromium.
下層路盤や路床の実際の改良施工では、施工前にあらかじめ微粉砕したゴミ溶融スラグに消石灰を混合し、これを土と混合・攪拌した後、通常の施工と同様に転圧（締固め）して行うことができる。 In the actual improvement construction of the lower roadbed and roadbed, slaked lime is mixed with the crushed dust molten slag before construction, and this is mixed and stirred with the soil, and then rolled (compacted) in the same way as normal construction. Can be done.
一般住宅用の建設に際して、地耐力のない地盤にあらかじめ微粉砕したゴミ溶融スラグに消石灰５重量％程度添加し、これを土と２５重量％〜７５重量％の割合で表層から２ｍまでを混合・攪拌すれば、十分な地盤強度が得られることが予測される。 When constructing a general house, add about 5% by weight of slaked lime to the molten slag that has been finely pulverized in advance to the ground without earth resistance, and mix this with the soil at a rate of 25% to 75% by weight from the surface to 2m. It is predicted that sufficient ground strength can be obtained by stirring.
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