JP2819381B2 - Cement-based solidifying material and method for producing the same - Google Patents
Cement-based solidifying material and method for producing the sameInfo
- Publication number
- JP2819381B2 JP2819381B2 JP5339915A JP33991593A JP2819381B2 JP 2819381 B2 JP2819381 B2 JP 2819381B2 JP 5339915 A JP5339915 A JP 5339915A JP 33991593 A JP33991593 A JP 33991593A JP 2819381 B2 JP2819381 B2 JP 2819381B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- weight
- free lime
- cement clinker
- portland 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.)
- Expired - Fee Related
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軟弱土壌を固化処理す
るセメント系固化材およびその製造方法に関するもので
ある。さらに、詳しくは生石灰（ＣａＯ）を原料として
使用しないセメント系固化材およびその製造方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement solidifying material for solidifying soft soil and a method for producing the same. More particularly, the present invention relates to a cement-based solidified material that does not use quick lime (CaO) as a raw material and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、ポゾラン反応性の高い加水ハロイ
サイトやアロフェンなどの粘土鉱物を多く含む軟弱土壌
様固化材としては、セメントに生石灰原料を適量混合し
た固化材が使用されている。しかし、生石灰は土壌の水
分と反応して容積が２倍近く膨張するため、セメントと
生石灰の混合が不十分な場合は施工後に部分的な膨張亀
裂を発生し問題となっていた。また、生石灰は危険物
（第３種乙種）であるため、その保管には注意が必要で
あり、さらに、セメントとの混合のための大規模な設備
と余分な工程を必要とするため生石灰を使用しないセメ
ント系固化材の開発が早急な課題となっていた。2. Description of the Related Art Conventionally, as a soft soil-like solidifying material containing a large amount of clay minerals such as hydrohaloysite and allophane, which have a high pozzolanic reactivity, a solidifying material obtained by mixing a suitable amount of quicklime material with cement has been used. However, since quicklime reacts with soil moisture and expands its volume almost twice, if the mixing of cement and quicklime is insufficient, partial expansion cracks occur after construction, which has been a problem. In addition, quicklime is a dangerous substance (Class 3 Otsukin), so care must be taken in its storage. In addition, it requires large-scale equipment and an extra process for mixing with cement, so that quicklime is used. The development of an unused cement-based solidification material was an urgent issue.
【０００３】[0003]
【発明が解決しようとする課題】そこで、本発明は生石
灰を原料として使用しないセメント系固化材およびその
製造方法を提供することを課題とするものである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a cement-based solidified material that does not use quicklime as a raw material and a method for producing the same.
【０００４】[0004]
【課題を解決するための手段】第１の発明にかゝる固化
材は、固化材を構成する主材として２〜１０重量％の遊
離石灰を含有するポルトランドセメントクリンカー粉砕
物を使用したことを特徴とするものである。According to a first aspect of the present invention, a solidified material comprises a ground Portland cement clinker containing 2 to 10% by weight of free lime as a main material constituting the solidified material. It is a feature.
【０００５】また、その固化材を製造する第２の発明
は、遊離石灰を２〜１０重量％含有するポルトランドセ
メントクリンカーにＳＯ３として４〜２０重量％となる
ように石膏を添加して混合粉砕又は後工程で添加すると
いう方法である。[0005] The second invention for producing the solidifying material is mixed and ground Portland cement clinker containing free lime 2-10% by weight by adding the gypsum so that 4 to 20% by weight as SO 3 Alternatively, it is a method of adding in a later step.
【０００６】第１の発明において、固化材を構成するポ
ルトランドセメントクリンカー粉砕物に遊離石灰を含有
させる理由は、遊離石灰（ＣａＯ）が生石灰と同様に水
和反応により軟弱土壌の脱水作用を有するからであり、
また、水和反応によって生じたＣａ（ＯＨ）２が土壌中
の粘土鉱物の構成成分であるＳｉＯ２やＡｌ２Ｏ３と反
応してカルシウムシリケートおよびカルシウムアルミネ
ート水和物を生成して土壌粒子を固結させ強度を増進さ
せる作用があるからである。さらに、ポルトランドセメ
ントクリンカー粉砕物に遊離石灰を含有させることによ
り、後工程で生石灰を混合させる場合より均一な固化処
理機能を発現できるからである。In the first invention, the reason why free lime is contained in the ground Portland cement clinker constituting the solidifying material is that free lime (CaO) has a dehydrating effect on soft soil by a hydration reaction similarly to quick lime. And
In addition, Ca (OH) 2 generated by the hydration reaction reacts with SiO 2 and Al 2 O 3 which are constituents of the clay mineral in the soil to form calcium silicate and calcium aluminate hydrate, thereby forming soil particles. This is because they have the effect of consolidating and increasing the strength. Furthermore, by adding free lime to the Portland cement clinker pulverized material, a more uniform solidification treatment function can be exhibited than when quick lime is mixed in a later step.
【０００７】また、本発明において、固化材を構成する
ポルトランドセメントクリンカー粉砕物の遊離石灰を含
有する量を２〜１０重量％と限定した理由は、２重量％
より少ないと遊離石灰の脱水および強度増進が十分でな
くなるからであり、１０重量％より多いとポルトランド
セメントクリンカー自体が生焼けとなり十分な強度を発
現できなくなるからである。In the present invention, the reason why the amount of free lime contained in the pulverized Portland cement clinker constituting the solidified material is limited to 2 to 10% by weight is 2% by weight.
If the amount is less than the above, the dehydration of free lime and the increase in the strength become insufficient, and if the amount is more than 10% by weight, the Portland cement clinker itself becomes burnt and cannot exhibit sufficient strength.
【０００８】遊離石灰を２〜１０重量％含有するポルト
ランドセメントクリンカーは、クリンカー焼成工程にお
ける焼成温度を普通のポルトランドセメント焼成時より
も低くするか、焼成時間を短くすることによって得られ
る。したがって、従来方法と比較して、焼成エネルギー
の節減効果が期待できる。しかし、温度を低くしすぎた
り、焼成時間を短くしすぎると、遊離石灰が多くなると
ともにポルトランドセメントクリンカーの鉱物化が不十
分な生焼けの状態となるため、セメント自体の強度発現
が得られなくなる。このため遊離石灰が１０重量％以下
となるように焼成条件を制御することが重要である。[0008] Portland cement clinker containing 2 to 10% by weight of free lime can be obtained by lowering the firing temperature in the clinker firing step as compared with ordinary Portland cement firing or by shortening the firing time. Therefore, an effect of reducing firing energy can be expected as compared with the conventional method. However, if the temperature is too low or the firing time is too short, the amount of free lime increases and the Portland cement clinker becomes insufficiently mineralized, so that the cement itself cannot exhibit strength. Therefore, it is important to control the firing conditions so that the amount of free lime is 10% by weight or less.
【０００９】普通のセメント製造時の焼成キルンの運転
開始から安定運転にいたるまでに、焼成不足の場合、遊
離石灰の多いポルトランドセメントクリンカーが生産さ
れるが、このポルトランドセメントクリンカーは含有さ
れる遊離石灰が２〜１０重量％の範囲に入るので、本発
明によるセメント系固化材のセメントクリンカーとして
使用することができる。したがって、従来、焼成不足の
ため、普通のセメントのクリンカーとして用いることが
できずに処分に困っていた遊離石灰の多い不良ポルトラ
ンドクリンカーの有効活用が可能である。[0009] From the start of operation of the calcining kiln during normal cement production to the stable operation, if the calcining is insufficient, Portland cement clinker with a large amount of free lime is produced, and the Portland cement clinker contains free lime. Can be used as a cement clinker for the cement-based solidification material according to the present invention. Therefore, the poor Portland clinker containing a large amount of free lime, which has been difficult to dispose because it cannot be used as a normal cement clinker due to insufficient firing, can be effectively used.
【００１０】石膏はＳＯ３として４〜２０重量％となる
ように添加するのが実用上好ましい。また、混合粉砕時
でなく後工程で添加しても良い。It is practically preferable to add gypsum so that the amount of SO 3 becomes 4 to 20% by weight. Further, it may be added not in the mixing and pulverization but in a subsequent step.
【００１１】[0011]
【実施例】調合原料の諸率が表１のようになるように石
灰石と粘土を主原料として調合を行い、ボールミルを使
って粉砕混合した。EXAMPLES Mixing was carried out using limestone and clay as main raw materials so that the various ratios of the mixing raw materials were as shown in Table 1, and the mixture was pulverized and mixed using a ball mill.
【００１２】[0012]
【表１】 [Table 1]
【００１３】上記各調合原料を一軸プレスにて成形後、
電気炉にて温度を変化させて焼成した結果、遊離石灰の
含有量が表２のようになったポルトランドセメントクリ
ンカーを得た。これらのポルトランドセメントクリンカ
ー８７重量％に対して無水石膏を１３重量％添加して、
４５００ｃｍ２／ｇを目標として粉砕を行いセメント系
固化材を製造した。After forming each of the above prepared raw materials by a uniaxial press,
As a result of firing by changing the temperature in an electric furnace, a Portland cement clinker having a free lime content as shown in Table 2 was obtained. 13% by weight of anhydrous gypsum was added to 87% by weight of these Portland cement clinkers,
Crushing was performed with a target of 4500 cm 2 / g to produce a cement-based solidified material.
【００１４】すなわち、石灰石と粘土を主原料として
Ｈ．Ｍ．が２．１４，Ｓ．Ｍ．が２．７０，Ｉ．Ｍ．が
１．６０，ＳＯ３が０．５％となるようにセメントクリ
ンカー原料を調合して焼成し、遊離石灰量１．３〜１
０．８重量％のセメントクリンカーを製造し、このセメ
ントクリンカー８７重量％に対して無水石膏を１３重量
％添加して４５００ｃｍ２／ｇを目標として粉砕を行い
セメント系固化材を得た。That is, limestone and clay are used as main raw materials. M. Is 2.14, S.D. M. Is 2.70; M. There 1.60, SO 3 is fired to prepare a cement clinker raw material to 0.5% of free lime amount 1.3 to
0.8% by weight of cement clinker was manufactured, and anhydrous gypsum was added to 87% by weight of the cement clinker and pulverized to a target of 4500 cm 2 / g to obtain a cement-based solidified material.
【００１５】[0015]
【表２】 [Table 2]
【００１６】セメント系固化材の固化特性を評価するた
めの試料土壌としては、表３に示すような日本統一分類
で火山灰質粘性土（ＶＨ２）に分類される含水比の異な
る２種類の試料土壌Ａ（含水比８６％）とＢ（含水比１
３３％）を使用した。As the sample soil for evaluating the solidification characteristics of the cement-based solidification material, two types of samples having different water content ratios classified as volcanic ash cohesive soil (VH 2 ) according to the Japan Unified Classification as shown in Table 3 Soil A (water content 86%) and B (water content 1
33%) was used.
【００１７】[0017]
【表３】 [Table 3]
【００１８】試料土壌に対して、表２に示したポルトラ
ンドセメントクリンカーから得られたセメント系固化材
をＡに対しては７重量％、Ｂに対しては１０重量％添加
して混練り後、３日間湿空養生後、４日間水中にて養住
して固化処理された試験体を得た。得られた試験体の路
床土支持力比（ＣＢＲ）をＪＩＳＡ１２１１に規格化さ
れている試験方法により評価した結果を表４に示した。To the sample soil, a cement-based solidifying material obtained from Portland cement clinker shown in Table 2 was added by 7% by weight to A and 10% by weight to B, and kneaded. After curing for 3 days under moist air, the specimens were nourished in water for 4 days and solidified. Table 4 shows the results of evaluating the subgrade soil bearing capacity ratio (CBR) of the obtained test specimens by a test method standardized in JIS A1211.
【００１９】[0019]
【表４】 [Table 4]
【００２０】表４に示す試験結果から、遊離石灰を２〜
１０重量％含有するポルトランドセメントクリンカーに
無水石膏を添加して粉砕して製造したセメント系固化材
によって固化処理した試験体のＣＢＲ値は、路床として
の改良目標値として比較的多用されている２０％を越え
ており、固化処理特性に優れていることが分かった。From the test results shown in Table 4, the free lime was 2 to 2
The CBR value of a specimen solidified with a cement-based solidifying material manufactured by adding anhydrous gypsum to Portland cement clinker containing 10% by weight and being pulverized is relatively widely used as an improvement target value for a roadbed. %, Which indicates that the solidification properties are excellent.
【００２１】[0021]
【発明の効果】本発明にかゝる固化材は、固化材を構成
するポルトランドセメントクリンカー粉砕物が遊離石灰
を含有するため、生石灰を混合添加する場合と比較して
特性のバラッキがなくなり、均一な固化処理機能が得ら
れる。また、その製造法として従来法のような生石灰の
混合工程が不要となるため、製造費用の低減が可能とな
る。更に従来の固化材の製造方法と比較して、焼成エネ
ルギーの節減ができる。As described above, the solidified material according to the present invention is characterized in that the crushed Portland cement clinker constituting the solidified material contains free lime. A solidification function can be obtained. In addition, since a mixing process of quick lime as in the conventional method is not required as the manufacturing method, the manufacturing cost can be reduced. Further, the firing energy can be reduced as compared with the conventional method for manufacturing a solidified material.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C09K 17/10 C04B 7/04 C04B 11/30──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) C09K 17/10 C04B 7/04 C04B 11/30
Claims (2)
材において、固化材を構成するポルトランドセメントク
リンカー粉砕物が２〜１０重量％の遊離石灰を含有する
ことを特徴とするセメント系固化材。1. A cement-based solidification material for solidifying soft soil, wherein the ground Portland cement clinker constituting the solidification material contains 2 to 10% by weight of free lime.
トランドセメントクリンカーにＳＯ３として４〜２０重
量％となるように石膏を添加して混合粉砕又は後工程で
添加することを特徴とするセメント系固化材の製造方
法。2. A cement which is characterized by adding in a subsequent mixing and grinding or by addition of gypsum so that 4 to 20% by weight as SO 3 free lime Portland cement clinker containing 2-10 wt% process A method for producing a solidified material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5339915A JP2819381B2 (en) | 1993-11-26 | 1993-11-26 | Cement-based solidifying material and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5339915A JP2819381B2 (en) | 1993-11-26 | 1993-11-26 | Cement-based solidifying material and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07149550A JPH07149550A (en) | 1995-06-13 |
| JP2819381B2 true JP2819381B2 (en) | 1998-10-30 |
Family
ID=18331976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5339915A Expired - Fee Related JP2819381B2 (en) | 1993-11-26 | 1993-11-26 | Cement-based solidifying material and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2819381B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5747407B2 (en) * | 2010-09-28 | 2015-07-15 | 国立大学法人東京工業大学 | High activity cement clinker, high activity cement and early strength cement composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4086158A (en) * | 1976-09-24 | 1978-04-25 | Gulf Research & Development Company | Process for upgrading solids-containing liquid hydrocarbon oils |
-
1993
- 1993-11-26 JP JP5339915A patent/JP2819381B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07149550A (en) | 1995-06-13 |
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