JPS6310110B2 - - Google Patents
Info
- Publication number
- JPS6310110B2 JPS6310110B2 JP4108083A JP4108083A JPS6310110B2 JP S6310110 B2 JPS6310110 B2 JP S6310110B2 JP 4108083 A JP4108083 A JP 4108083A JP 4108083 A JP4108083 A JP 4108083A JP S6310110 B2 JPS6310110 B2 JP S6310110B2
- Authority
- JP
- Japan
- Prior art keywords
- inorganic
- slag
- weight ratio
- cured product
- amount
- 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
Links
- 239000002893 slag Substances 0.000 claims description 17
- 239000011230 binding agent Substances 0.000 claims description 12
- 239000011256 inorganic filler Substances 0.000 claims description 12
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 239000010440 gypsum Substances 0.000 claims description 8
- 229910052602 gypsum Inorganic materials 0.000 claims description 8
- 239000011398 Portland cement Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 235000013312 flour Nutrition 0.000 claims 1
- 239000010881 fly ash Substances 0.000 claims 1
- 229910001653 ettringite Inorganic materials 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004438 BET method Methods 0.000 description 1
- 241000975357 Salangichthys microdon Species 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Description
〔技術分野〕
この発明は、ポルトランドセメント−スラグ系
の無機バインダーを用いた無機硬化体の製法に関
する。
〔背景技術〕
ポルトランドセメントにスラグを配合し、さら
に必要に応じ少量の石こうを配合した無機バイン
ダーを主成分とする混練物を養生硬化させて得た
無機硬化体は、ポルトランドセメントのみを無機
バインダーとする硬化体よりも高強度である。こ
れは、硬化体中において、ポルトランドセメント
やスラグの水和物粒子間の間隙にエトリンガイト
結晶が生成し、これらが互いにあるいは前記水和
物粒子とからみ合うことによる。
しかしながら、エトリンガイトは、加熱により
脱水しやすいため寸法収縮が大きく、反面、再水
和による吸水膨張も大きいという欠点をもつ。
したがつて、ポルトランドセメント−スラグ系
の無機硬化体では、その解決が望まれていた。
〔発明の目的〕
この発明は、上記事情に鑑み、ポルトランドセ
メント−スラグ系無機硬化体の寸法安定性を改善
することを第１の目的とし、併せて強度の一層の
向上を図ることを第２の目的とする。
〔発明の開示〕
発明者らは、上記の目的を達成するために、混
練物のポルトランドセメント／スラグ重量比率と
混水比を選ぶとともに、比表面積がある一定以上
で反応性の微細な無機フイラーとある一定量の石
こうを混練物に添加することとすればよいことを
見出し、鋭意検討を重ねた結果、この発明を完成
するに至つた。
したがつて、この発明は、ポルトランドセメン
トとスラグを必須成分とするとともに全体中のス
ラグの重量比率が50％以上の無機バインダーを主
成分とし、混合水量が無機バインダーに対する重
量比率で15〜30％となつている混練物を養成硬化
させて無機硬化体を得るにあたり、混練物中に、
重量比率が２％未満の石こうと比表面積が10000
cm2／ｇ以上で反応性の無機フイラーを添加してお
くことを特徴とする無機硬化体の製法をその要旨
とする。以下にこれを詳しく述べる。
無機バインダーとしてはポルトランドセメント
とスラグが必須成分として用いられる。これらは
高炉セメントの形で配合されてもよい。他に、少
量の石こう等が配合されることもある。無機バイ
ンダー全体中のスラグの重量比率は50％以上とす
る。スラグ量が増すにつれてゲル状の硬化物が減
り、寸法収縮が小さくなる。スラグ量が50％未満
になると、混練物中の混合水のPHが高くなり（PH
13以上となる）、エトリンガイト（TSH）が生成
しにくくなる。
石こうは、２重量％未満添加されることにより
スラグの反応を促進させるとともに、スラグと反
応もして、得られる硬化体の曲げ強度および寸法
変化率を向上させる働きを有している。しかし、
その添加量が、０重量％でも２重量％を越えても
寸法変化率が悪くなる。とくに、２重量％を越え
るとエトリンガイトの生成が起こりすぎて寸法変
化率を悪化させる。曲げ強度は、石こうが少し添
加されるだけでも向上するが、添加量を増やして
もそれ以上向上することはない。
これに、比表面積（ブレーン値）が、10000
cm2／ｇ以上、好ましくは20000cm2／ｇ以上の極微
細無機フイラーが配合される。この無機フイラー
は反応性すなわちポゾラン反応を起こし得るポゾ
ラン物質であることが必要である。材料として
は、フライアツシユ、シリカフラワー、シラス、
白土などが挙げられる。比表面積がこれほどに大
きくない、普通一般に用いられている無機フイラ
ーが併せて用いられてもよく、有機フイラーが用
いられてもよい。反応性を持たないものが併用さ
れてもよい。比表面積10000cm2／ｇ以上の無機フ
イラーは混練物中の固型分の重量基準で３〜30％
とすることが好ましい。３％未満では効果が少な
く、30％を超えると他の物性の低下を招くおそれ
があるからである。
比表面積10000cm2／ｇ以上の無機フイラーは、
非常に微細であるため、ポルトランドセメントや
スラグの硬化物粒子とエトリンガイト結晶とが相
互にからみ合つている間に生じた隙間に入り込む
ことができる。そして、その隙間を全部もしくは
部分的に埋める。これによつて、エトリンガイト
の脱水、再水和に併い生じる無機硬化体の寸法変
化を防ぐことができるのである。この無機フイラ
ーは、反応性を持つため、無機バインダーと結合
することができ、強度の向上に寄与することがで
きる。特に吸水時強度を高めることができる。
必要に応じ、その他の添加材が配合され、混合
水が加えられて、混練される。混合水量は、無機
バインダーに対し重量基準で15〜30％とする。15
％未満では、マトリツクスの硬化に必要な水分が
得られない。他方、30％を超えると、硬化体中に
水分蒸発跡の空隙が生じ、寸法収縮が大きく起き
るようになる。
この混練物を所望の形に成形し、養生硬化させ
ると、無機硬化体が得られる。
つぎに、実施例を比較例と併せて述べる。
第１表の配合物に、無機バインダーに対し25重
量％となる割合で水を添加し、充分混合して、16
cm×４cm×４cmの型に充填し、80℃×72時間養生
し、無機硬化体を得た。ブレーン値はミル粉砕後
BET法で求めた。
[Technical Field] The present invention relates to a method for producing an inorganic hardened body using a Portland cement-slag-based inorganic binder. [Background technology] An inorganic hardened product obtained by curing and curing a kneaded material whose main component is an inorganic binder in which slag is blended with Portland cement and a small amount of gypsum is blended as necessary. It has higher strength than the cured product. This is because ettringite crystals are generated in the gaps between the hydrate particles of Portland cement or slag in the hardened body, and these crystals become entangled with each other or with the hydrate particles. However, ettringite has the disadvantage that it is easily dehydrated by heating, resulting in large dimensional shrinkage, and on the other hand, it also undergoes large water absorption expansion due to rehydration. Therefore, a solution to this problem has been desired with a portland cement-slag based inorganic hardened body. [Object of the invention] In view of the above circumstances, the first object of the present invention is to improve the dimensional stability of a portland cement-slag-based inorganic hardened body, and the second object is to further improve the strength. The purpose of [Disclosure of the Invention] In order to achieve the above object, the inventors selected the Portland cement/slag weight ratio and water mixing ratio of the kneaded product, and also created a reactive fine inorganic filler with a specific surface area above a certain level. They discovered that it was sufficient to add a certain amount of gypsum to the kneaded material, and after extensive research, they completed this invention. Therefore, this invention has Portland cement and slag as essential components, and an inorganic binder in which the weight ratio of slag in the whole is 50% or more, and the amount of mixed water is 15 to 30% in weight ratio to the inorganic binder. When curing and curing the kneaded product to obtain an inorganic cured product, in the kneaded product,
Gypsum with a weight ratio of less than 2% and a specific surface area of 10,000
The gist of this invention is a method for producing an inorganic cured product, which is characterized by adding a reactive inorganic filler in an amount of cm 2 /g or more. This will be explained in detail below. Portland cement and slag are used as essential inorganic binders. These may be formulated in the form of blast furnace cement. In addition, a small amount of gypsum or the like may be added. The weight ratio of slag in the entire inorganic binder shall be 50% or more. As the amount of slag increases, the gel-like cured product decreases and dimensional shrinkage decreases. When the amount of slag is less than 50%, the pH of the mixed water in the kneaded material becomes high (PH
13 or higher), it becomes difficult to generate ettringite (TSH). When added in an amount of less than 2% by weight, gypsum has the function of accelerating the reaction of the slag and also reacting with the slag to improve the bending strength and dimensional change rate of the resulting cured product. but,
Whether the amount added is 0% by weight or exceeds 2% by weight, the dimensional change rate will be poor. In particular, if it exceeds 2% by weight, too much ettringite will be formed, which will worsen the dimensional change rate. The bending strength can be improved by adding a small amount of gypsum, but increasing the amount does not improve it any further. In addition, the specific surface area (Brane value) is 10000
Ultrafine inorganic filler of cm 2 /g or more, preferably 20000 cm 2 /g or more is blended. The inorganic filler needs to be a reactive, ie pozzolanic material capable of undergoing a pozzolanic reaction. Ingredients include fly atsushi, silica flower, whitebait,
Examples include white clay. A commonly used inorganic filler whose specific surface area is not so large may also be used, or an organic filler may be used. Non-reactive substances may be used in combination. The inorganic filler with a specific surface area of 10,000 cm 2 /g or more is 3 to 30% based on the weight of the solid content in the kneaded material.
It is preferable that This is because if it is less than 3%, the effect is small, and if it exceeds 30%, other physical properties may deteriorate. Inorganic fillers with a specific surface area of 10,000 cm 2 /g or more are
Because it is very fine, it can fit into the gaps created when the hardened particles of Portland cement or slag and ettringite crystals are entangled with each other. Then, fill the gap in whole or in part. This makes it possible to prevent dimensional changes in the inorganic hardened body that occur due to dehydration and rehydration of ettringite. Since this inorganic filler has reactivity, it can be combined with an inorganic binder and can contribute to improving strength. In particular, the strength can be increased when water is absorbed. If necessary, other additives are blended, mixing water is added, and the mixture is kneaded. The amount of mixed water is 15 to 30% by weight based on the inorganic binder. 15
If it is less than %, the moisture necessary for curing the matrix cannot be obtained. On the other hand, if it exceeds 30%, voids remain in the cured product due to water evaporation, resulting in large dimensional shrinkage. When this kneaded material is molded into a desired shape and cured, an inorganic cured product is obtained. Next, examples will be described together with comparative examples. Water was added to the formulation shown in Table 1 at a ratio of 25% by weight based on the inorganic binder, and the mixture was thoroughly mixed.
The mixture was filled into a cm x 4 cm x 4 cm mold and cured at 80°C for 72 hours to obtain an inorganic cured product. Blaine value is after mill grinding
Obtained using the BET method.
【表】【table】
【表】
上記養生後、各硬化体を40℃×24時間、引続き
60℃×24時間乾燥したときの寸法収縮率を求め
た。併せて、上記養生後60℃×24時間乾燥し、比
重を求め、24時間吸水させて強度を測つた。測定
はオートグラフを用いて行つた。結果は第２表に
あらわした。第２表にみるように、実施例はいず
れも、比較例に比し、寸法収縮率が小さく、しか
も強度が大きかつた。[Table] After the above curing, each cured product was heated at 40°C for 24 hours.
The dimensional shrinkage rate was determined when drying at 60°C for 24 hours. In addition, after the above-mentioned curing, it was dried at 60°C for 24 hours, the specific gravity was determined, and the strength was measured after absorbing water for 24 hours. Measurements were performed using an autograph. The results are shown in Table 2. As shown in Table 2, all of the Examples had smaller dimensional shrinkage rates and greater strength than the Comparative Examples.
この発明は、上述のごとき特別の無機バインダ
ー重量比率と混水比を持つ混練物に、２重量％未
満の石こう、および、比表面積が10000cm2／ｇ以
上で反応性の極微細無機フイラーを添加している
ため、得られた無機硬化体は、極めて高強度であ
り、しかも寸法変化が少ない。
This invention adds less than 2% by weight of gypsum and a reactive ultrafine inorganic filler with a specific surface area of 10,000 cm 2 /g or more to a kneaded material having a special inorganic binder weight ratio and water mixing ratio as described above. Therefore, the obtained inorganic cured product has extremely high strength and has little dimensional change.
Claims (1)
するとともに全体中のスラグの重量比率が50％以
上の無機バインダーを主成分とし、混合水量が無
機バインダーに対する重量比率で15〜30％となつ
ている混練物を養生硬化させて無機硬化体を得る
にあたり、混練物中に、重量比率が２％未満の石
こうと比表面積が10000cm2／ｇ以上で反応性の無
機フイラーを添加しておくことを特徴とする無機
硬化体の製法。 ２ 反応性無機フイラーがフライアツシユ、シリ
カフラワー、シラスおよび白土の中から選ばれた
少なくと１種である特許請求の範囲第１項記載の
無機硬化体の製法。 ３ 比表面積が10000cm2／ｇ以上で反応性の無機
フイラーの添加量が固型分の重量基準で３〜30％
となるように設定されている特許請求の範囲第１
項または第２項記載の無機硬化体の製法。[Scope of Claims] 1 The main component is an inorganic binder in which portland cement and slag are essential components, and the weight ratio of slag in the whole is 50% or more, and the amount of mixed water is 15 to 30% in weight ratio to the inorganic binder. When curing and curing the kneaded material to obtain an inorganic hardened material, gypsum with a weight ratio of less than 2% and a reactive inorganic filler with a specific surface area of 10,000 cm 2 /g or more are added to the kneaded material. A method for producing an inorganic cured product characterized by the following. 2. The method for producing an inorganic cured body according to claim 1, wherein the reactive inorganic filler is at least one selected from fly ash, silica flour, shirasu, and white clay. 3 Specific surface area is 10000 cm 2 /g or more and the amount of reactive inorganic filler added is 3 to 30% based on the weight of solid content
The first claim set to be
A method for producing an inorganic cured product according to item 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58041080A JPS59169958A (en) | 1983-03-12 | 1983-03-12 | Manufacture of inorganic hardened body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58041080A JPS59169958A (en) | 1983-03-12 | 1983-03-12 | Manufacture of inorganic hardened body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59169958A JPS59169958A (en) | 1984-09-26 |
| JPS6310110B2 true JPS6310110B2 (en) | 1988-03-03 |
Family
ID=12598479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58041080A Granted JPS59169958A (en) | 1983-03-12 | 1983-03-12 | Manufacture of inorganic hardened body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59169958A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61281057A (en) * | 1985-06-06 | 1986-12-11 | 日鐵セメント株式会社 | Composition for high strength high endurance mortar concrete |
| JPS6296355A (en) * | 1985-10-21 | 1987-05-02 | 電気化学工業株式会社 | Heat-resistant cement composition |
| JPH0492846A (en) * | 1990-08-09 | 1992-03-25 | Ohbayashi Corp | Concrete composition |
| ATE178293T1 (en) * | 1992-05-25 | 1999-04-15 | Hoop Terneuzen B V De | CEMENT COMPOSITION AND METHOD FOR PRODUCING THE SAME |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223128A (en) * | 1975-08-18 | 1977-02-21 | Shinetsu Chemical Co | Method of manufacturing molded cement products |
| JPS553325A (en) * | 1978-06-20 | 1980-01-11 | Tokuyama Soda Kk | Mortar composition |
| JPS557553A (en) * | 1978-06-30 | 1980-01-19 | Matsushita Electric Works Ltd | Glass fiber reinforced cement hardened article |
-
1983
- 1983-03-12 JP JP58041080A patent/JPS59169958A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223128A (en) * | 1975-08-18 | 1977-02-21 | Shinetsu Chemical Co | Method of manufacturing molded cement products |
| JPS553325A (en) * | 1978-06-20 | 1980-01-11 | Tokuyama Soda Kk | Mortar composition |
| JPS557553A (en) * | 1978-06-30 | 1980-01-19 | Matsushita Electric Works Ltd | Glass fiber reinforced cement hardened article |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59169958A (en) | 1984-09-26 |
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