JPH08199558A - Poor subsoil improvement material - Google Patents
Poor subsoil improvement materialInfo
- Publication number
- JPH08199558A JPH08199558A JP7008877A JP887795A JPH08199558A JP H08199558 A JPH08199558 A JP H08199558A JP 7008877 A JP7008877 A JP 7008877A JP 887795 A JP887795 A JP 887795A JP H08199558 A JPH08199558 A JP H08199558A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- heat treatment
- improvement material
- water
- hardened cement
- 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
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、硬化したセメントを熱
処理して再活性化させた軟弱地盤改良材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft ground improvement material in which hardened cement is heat-treated and reactivated.
【０００２】[0002]
【従来の技術】従来、コンクリートは役割を終えると砕
かれてコンクリート塊となり、産業廃棄物として棄却さ
れてきた。近年投棄場所の確保が困難になってきたた
め、コンクリートの再生利用方法としてコンクリートを
砕いた後、ふるい分けを行って骨材を取り出し、骨材は
再びコンクリート用骨材として利用し、骨材を除いた後
の硬化したセメント、いわゆる硬化セメントは埋め戻し
用に利用する試みがなされている。しかしながら硬化セ
メントの利用方法が、埋め戻し用という程度ではコンク
リートの再生利用法として十分とは言えず、より有益な
硬化セメントの再生利用法の開発が強く望まれている。2. Description of the Related Art Conventionally, concrete has been crushed into a lump of concrete when it has finished its role and discarded as industrial waste. Since it has become difficult to secure a dumping place in recent years, after crushing concrete as a method of recycling concrete, sieving was performed to remove the aggregate, and the aggregate was reused as the aggregate for concrete and the aggregate was removed. Later hardened cement, so-called hardened cement, has been attempted to be used for backfilling. However, the method of using hardened cement is not sufficient as a method of recycling concrete for backfilling, and development of a more useful method of recycling hardened cement is strongly desired.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記したよ
うな従来の問題点を鑑みてなされたもので、その目的と
するところは、一度硬化した硬化セメントを再び活性化
させ、軟弱地盤改良材として有効利用することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to reactivate hardened cement once hardened to improve soft ground. It is to use it effectively as a material.
【０００４】[0004]
【課題を解決するための手段】本発明は、硬化したセメ
ントを４００℃乃至１３００℃の温度で熱処理してなる
軟弱地盤改良材に関する。The present invention relates to a soft ground improvement material obtained by heat treating hardened cement at a temperature of 400 ° C to 1300 ° C.
【０００５】[0005]
【作用】セメントは主としてカルシウムシリケートと呼
ばれる酸化カルシウムと二酸化珪素の化合物からなり、
他に酸化カルシウムと酸化アルミニウムおよび酸化第２
鉄が組合わさった化合物も少量含む。セメントと水を混
ぜ合わせるとこれらの化合物と水が反応し、カルシウム
シリケートの場合はカルシウムシリケート水和物を、そ
の他の化合物もそれぞれの水和物を生成して硬化する。
カルシウムシリケートの場合は、水和反応過程で酸化カ
ルシウムと水だけの化合物である水酸化カルシウムも併
せて生成する。本発明は、硬化したセメントを４００℃
乃至１３００℃の温度で、好ましくは４００℃乃至８０
０℃の温度で熱処理すると、水和物として結合していた
水が脱水されて活性化し、得られた脱水物は軟弱地盤改
良材として極めて優れていることの知見に基づいてい
る。[Function] Cement mainly consists of a compound of calcium oxide and silicon dioxide called calcium silicate,
Calcium oxide, aluminum oxide and second oxide
It also contains a small amount of compounds that combine iron. When cement and water are mixed together, these compounds react with water, and in the case of calcium silicate, calcium hydrate hydrate is formed, and other compounds also form their respective hydrates and harden.
In the case of calcium silicate, calcium oxide and calcium hydroxide, which is a compound containing only water, are also produced during the hydration reaction process. The present invention is to cure hardened cement at 400 ° C.
To 1300 ° C, preferably 400 ° C to 80
It is based on the finding that when heat-treated at a temperature of 0 ° C., water bound as a hydrate is dehydrated and activated, and the obtained dehydrated product is extremely excellent as a soft ground improvement material.
【０００６】硬化したセメントを熱処理して脱水させる
と、カルシウムシリケート水和物や水酸化カルシウムか
ら水を除いた物質が残り、この活性化された脱水物はこ
れに再び水を加えると、ただちに水と反応して元の水和
物に戻り硬化する作用がある。[0006] When the hardened cement is heat-treated and dehydrated, calcium hydrate hydrate or a substance obtained by removing water from calcium hydroxide remains, and the activated dehydrated product is immediately added with water when water is added again. It reacts with and returns to the original hydrate and hardens.
【０００７】本発明において熱処理温度が１３００℃を
越える高温になると、結合していた水が脱水された後化
合物の組替えが起こって元のセメントに戻る。当然のこ
とながら加熱温度が高くなるほどエネルギー消費量が多
くなるし、加熱設備も大がかりになるが、セメントその
ものは大規模工場設備で多量に製造されているので、高
いコストをかけて硬化セメントを元のセメントに戻すの
は、硬化セメントの再生利用方法として適当でない。ま
た熱処理温度が低すぎると、脱水が十分でなく軟弱地盤
改良材としての効果が不十分になる。熱処理時間は、硬
化したセメントの結合水が脱水できる時間であれば特に
制限されず、温度が高いほど短時間でよいが、普通には
３分乃至１２０分間、好ましくは５分乃至６０分間であ
る。また熱処理は空気などの酸素含有ガス雰囲気下で行
うのが好適である。In the present invention, when the heat treatment temperature exceeds 1300 ° C., the bound water is dehydrated and then the compound is recombined to return to the original cement. As a matter of course, the higher the heating temperature, the more energy consumption and the larger the heating equipment, but since the cement itself is produced in large quantities in large-scale factory equipment, it costs a lot of cost to recover the hardened cement. It is not suitable to re-use the hardened cement as a method of recycling the hardened cement. On the other hand, if the heat treatment temperature is too low, dehydration is insufficient and the effect as a soft ground improving material becomes insufficient. The heat treatment time is not particularly limited as long as the bound water of the hardened cement can be dehydrated, and the higher the temperature, the shorter the time, but usually 3 minutes to 120 minutes, preferably 5 minutes to 60 minutes. . The heat treatment is preferably performed in an oxygen-containing gas atmosphere such as air.
【０００８】本発明において、硬化したセメントとして
は、産業廃棄物として排出される使用済のコンクリー
ト、モルタル、未使用で放置されて硬化したセメントな
どを挙げることができ、コンクリートやモルタル塊は粗
粉砕して粗骨材、細骨材などを分離あるいは分離せずに
使用しても差し支えない。また硬化したセメントは、特
にその種類に制限はなく、セメントは普通ポルトランド
セメント、早強ポルトランドセメント、超早強ポルトラ
ンドセメント、中庸熱ポルトランドセメント、低熱ポル
トランドセメント、ビーライト系ポルトランドセメン
ト、高炉セメント、フライアッシュセメント、多成分混
合セメントなどいずれであってもよい。In the present invention, examples of the hardened cement include used concrete discharged as industrial waste, mortar, cement left unused and hardened, and concrete and mortar lumps are roughly crushed. Then, coarse aggregate, fine aggregate, etc. may be separated or used without separation. In addition, the hardened cement is not particularly limited in its type, and the cement is ordinary Portland cement, fast early Portland cement, super early early Portland cement, moderate heat Portland cement, low heat Portland cement, belite portland cement, blast furnace cement, fly. It may be ash cement, multi-component mixed cement, or the like.
【０００９】[0009]
【実施例】以下実施例により、本発明を具体的に説明す
る。 実施例１〜３、比較例１ 表１に示す性状の有機質粘性土に、硬化した普通ポルト
ランドセメントを表２に示す製造条件で空気雰囲気下に
加熱して製造した軟弱地盤改良材を１０重量％（以下％
は重量％を意味する）添加し、材令２８日の一軸圧縮強
度を測定した。軟弱地盤改良材は、硬化した普通ポルト
ランドセメントを表２に示す製造条件で空気雰囲気下に
加熱して製造した。軟弱地盤改良材による固化試験結果
を同じく表２に示す。The present invention will be specifically described with reference to the following examples. Examples 1 to 3 and Comparative Example 1 10% by weight of a soft ground improvement material produced by heating hardened ordinary Portland cement to an organic cohesive soil having the properties shown in Table 1 under an air atmosphere under the production conditions shown in Table 2. (Less than%
Was added), and the uniaxial compressive strength was measured for 28 days. The soft ground improvement material was produced by heating hardened ordinary Portland cement under an air atmosphere under the production conditions shown in Table 2. Table 2 also shows the solidification test results using the soft ground improvement material.
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【表２】 [Table 2]
【００１２】実施例４〜６、比較例２ 表３に示す性状の有機質土混じり砂質土に、実施例１〜
３と同様に硬化した普通ポルトランドセメントを表４に
示す製造条件で空気雰囲気下に加熱して製造した軟弱地
盤改良材を１０％添加し、材令２８日の一軸圧縮強度を
測定した。軟弱地盤改良材による固化試験結果を同じく
表４に示す。Examples 4 to 6 and Comparative Example 2 Examples 1 to 6 were applied to sandy soil mixed with organic soil having the properties shown in Table 3.
The uniaxial compressive strength of 28 days of age was measured by adding 10% of the soft ground improvement material produced by heating the ordinary Portland cement hardened in the same manner as in No. 3 under the production conditions shown in Table 4 under the air atmosphere. The results of the solidification test with the soft ground improvement material are also shown in Table 4.
【００１３】[0013]
【表３】 [Table 3]
【００１４】[0014]
【表４】 [Table 4]
【００１５】上記試験結果より、本発明の軟弱地盤改良
材混入後の軟弱地盤の一軸圧縮強度は、０．５ｋｇｆ／
ｃｍ2 以上であり、軟弱地盤改良材として十分な性能を
有している。From the above test results, the uniaxial compressive strength of the soft ground after mixing the soft ground improving material of the present invention is 0.5 kgf /
It is at least cm 2 , and has sufficient performance as a soft ground improvement material.
【００１６】[0016]
【発明の効果】本発明による軟弱地盤改良材は元のセメ
ントに比べて大きく性状が異なり、建造物の築造のよう
な通常のセメントの用い方はできないが、軟弱地盤に添
加すれば地盤を固化する性能を発揮するので、軟弱地盤
改良材としては十分に利用することができる。また、本
発明の軟弱地盤改良材は、ネバリケの強い粘性土があた
かも砂に変わったようにサラサラした土に変化する現象
いわゆる団粒化作用を示すので土との混合作業が容易で
ある。さらに、他の軟弱地盤改良材である生石灰のよう
に多量の発熱をすることがないので、取扱いに危険がな
く、混合作業において作業環境を悪化させることがな
い。その上、コンクリートは硬化セメントと骨材の混合
物なので、使用済コンクリートをそのまま加熱すると骨
材の混じったものになるが、骨材が混入しても軟弱地盤
改良材として使用するのになんら支障はないので、使用
済コンクリートからも本発明による軟弱地盤改良材を容
易に得ることができる。EFFECTS OF THE INVENTION The soft ground improvement material according to the present invention has greatly different properties from the original cement and cannot be used as usual cement for building a building, but when added to soft ground, the ground solidifies. Therefore, it can be sufficiently used as a soft ground improvement material. Further, the soft ground improving material of the present invention exhibits a phenomenon of so-called agglomeration, in which cohesive soil with strong dryness changes into dry soil as if it changed into sand, so that mixing work with soil is easy. Furthermore, since it does not generate a large amount of heat unlike quick lime which is another soft ground improvement material, there is no danger of handling and the working environment during mixing work is not deteriorated. In addition, concrete is a mixture of hardened cement and aggregate, so if used concrete is heated as it is, it will become a mixture of aggregate, but even if aggregate is mixed in, there will be no obstacle to use it as a soft ground improvement material. Therefore, the soft ground improvement material according to the present invention can be easily obtained from used concrete.
Claims (1)
０℃の温度で熱処理してなる軟弱地盤改良材。1. The cured cement is heated to 400 ° C. to 130 ° C.
Soft ground improvement material obtained by heat treatment at a temperature of 0 ° C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00887795A JP3526096B2 (en) | 1995-01-24 | 1995-01-24 | Soft ground improvement material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00887795A JP3526096B2 (en) | 1995-01-24 | 1995-01-24 | Soft ground improvement material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08199558A true JPH08199558A (en) | 1996-08-06 |
| JP3526096B2 JP3526096B2 (en) | 2004-05-10 |
Family
ID=11704916
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00887795A Expired - Lifetime JP3526096B2 (en) | 1995-01-24 | 1995-01-24 | Soft ground improvement material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3526096B2 (en) |
-
1995
- 1995-01-24 JP JP00887795A patent/JP3526096B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3526096B2 (en) | 2004-05-10 |
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