JPH0625008B2 - Cement admixture and cement composition - Google Patents
Cement admixture and cement compositionInfo
- Publication number
- JPH0625008B2 JPH0625008B2 JP62081015A JP8101587A JPH0625008B2 JP H0625008 B2 JPH0625008 B2 JP H0625008B2 JP 62081015 A JP62081015 A JP 62081015A JP 8101587 A JP8101587 A JP 8101587A JP H0625008 B2 JPH0625008 B2 JP H0625008B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- strength
- amount
- setsukou
- admixture
- 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
- 239000004568 cement Substances 0.000 title claims description 34
- 239000000203 mixture Substances 0.000 title claims description 8
- 229910052602 gypsum Inorganic materials 0.000 claims description 11
- 239000010440 gypsum Substances 0.000 claims description 11
- 150000001639 boron compounds Chemical class 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 229940126062 Compound A Drugs 0.000 claims 1
- NLDMNSXOCDLTTB-UHFFFAOYSA-N Heterophylliin A Natural products O1C2COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC2C(OC(=O)C=2C=C(O)C(O)=C(O)C=2)C(O)C1OC(=O)C1=CC(O)=C(O)C(O)=C1 NLDMNSXOCDLTTB-UHFFFAOYSA-N 0.000 claims 1
- 239000004567 concrete Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 229910001653 ettringite Inorganic materials 0.000 description 6
- 238000006703 hydration reaction Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 241001061264 Astragalus Species 0.000 description 3
- 241001316290 Gypsophila Species 0.000 description 3
- 235000006533 astragalus Nutrition 0.000 description 3
- 239000003623 enhancer Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 210000004233 talus Anatomy 0.000 description 3
- 241000195620 Euglena Species 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 150000008064 anhydrides Chemical class 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- -1 For more details Substances 0.000 description 1
- BTBUEUYNUDRHOZ-UHFFFAOYSA-N Borate Chemical compound [O-]B([O-])[O-] BTBUEUYNUDRHOZ-UHFFFAOYSA-N 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- VGTPKLINSHNZRD-UHFFFAOYSA-N oxoborinic acid Chemical compound OB=O VGTPKLINSHNZRD-UHFFFAOYSA-N 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、セメント混和材及びセメント組成物に関し、
詳しくは、常圧加熱養生を行う、コンクリートパイル・
ポール・ヒユーム管・プレキヤスト等のコンクリート製
品製造全般に使用されるセメント混和材及びセメント組
成物に関する。TECHNICAL FIELD The present invention relates to a cement admixture and a cement composition,
For more details, concrete pile
The present invention relates to a cement admixture and a cement composition which are used in the overall production of concrete products such as poles, huym pipes and precasts.
従来、セッコウ類を比較的多量にモルタルやコンクリー
ト（以下、コンクリートという）に添加し、常圧加熱養
生（以下、蒸気養生という）を行つて高強度コンクリー
ト製品を造ることは公知であり、すでに汎用化された技
術である。セツコウ類の高強度発現作用は、CaOをＣ，A
l2O3をＡ，Fe2O3をＦとするとセメント中のC3AやC4AFな
どのアルミネート相とセツコウ類とが、蒸気養生中に急
速に反応し、エトリンガイトを生成することに基因する
と考えられている。そして、生成するエトリンガイトの
空隙充填能力が大きいこと、エトリンガイトが多量の結
晶水を保有することから、その分、水・セメント比（以
下Ｗ／Ｃという）が下がり、Ｗ／Ｃと強度の関係からＷ
／Ｃが下がつた分の強度増進があることは、本発明者ら
によつて確認されている（中川、渡辺；セラミツクス、
Vol１７、〔7〕、５０２〜５０７、１９８２）。即ち、
セツコウ類をセメントに添加し高強度製品を得るための
条件は(1)エトリンガイトを最大限生成させる為に、特
にセメント中のC3A量に見合つたセツコウ量が必要で、
セメントに対し１０〜１３重量％のセツコウ量が強度的
に最大値を示すことが知られている。(2)蒸気養生条件
としては、４０〜100℃がエトリンガイトの急速な生成
に必要であり、ボイラーの能力面から、通常６０℃〜８
５℃の養生条件が実際に製品工場において設定されてい
る。Conventionally, it is well known that a relatively high amount of gypsum is added to mortar or concrete (hereinafter referred to as concrete), and normal temperature heating curing (hereinafter referred to as steam curing) is performed to produce a high strength concrete product. Technology. The high-intensity expression effect of the Setsukou is due to CaO
When l 2 O 3 is A and Fe 2 O 3 is F, the aluminate phases such as C 3 A and C 4 AF in the cement and euglena react rapidly during steam curing to form ettringite. Is believed to be the cause. Since the ettringite produced has a large void filling capacity and the ettringite holds a large amount of crystal water, the water-cement ratio (hereinafter referred to as W / C) is reduced accordingly, and the relationship between W / C and strength is reduced. W
It has been confirmed by the present inventors that there is a strength increase corresponding to the decrease of / C (Nakagawa, Watanabe; Ceramics,
Vol 17, [7], 502-507, 1982). That is,
The conditions for obtaining high-strength products by adding Setsukou to the cement are (1) In order to maximize the production of ettringite, the amount of Setsukou that is commensurate with the amount of C 3 A in the cement is necessary.
It is known that the amount of Gypsophila from 10 to 13% by weight with respect to the cement shows the maximum strength. (2) As steam curing conditions, 40 to 100 ° C is necessary for the rapid production of ettringite, which is usually 60 to 8 ° C from the viewpoint of boiler capacity.
The curing condition of 5 ° C is actually set in the product factory.
しかしながら、セツコウ類を、セメントに対し５重量％
を越えて添加した場合、SiO2をＳとすると、セメントの
主水硬性鉱物であるC3S（アリツト）の水和開始時間が
極端に遅延され、添加量が多くなるほど遅延傾向は倍加
される。そのため、セツコウ類の効果とC3Sの水和によ
る強度発現効果を最大限に発揮させる為には、充分な養
生時間が必要となる。本発明者らの実験では、コンクリ
ートの凝結終了後通気から蒸気を止めるまで７〜８時間
は必要である。However, 5% by weight of cement was added to the cement.
If SiO 2 is added in excess of S, the hydration start time of C 3 S (Arit), which is the main hydraulic mineral of cement, will be extremely delayed if the content of SiO 2 is S, and the delay tendency will be doubled as the amount of addition increases. . Therefore, sufficient curing time is required to maximize the effects of the astragalus and the strength development effect by hydration of C 3 S. According to the experiments conducted by the present inventors, it takes 7 to 8 hours from ventilation to stopping steam after the completion of setting of concrete.
ところが、パイルやポールは別として、ヒユーム管やプ
レキヤスト製品等は、型枠の回転率や経済効率をあげる
目的で、脱型に必要な強度を得る為に必要最小限の蒸気
養生（例えば通気から止めるまで４時間程度）しかしな
いため、セツコウ類の添加効果（エトリンガイトは通気
後１〜３時間で生成は完結）が主にセメント中のC3Sの
水和不充分によつて充分発揮されない結果となるばかり
か、無添加のコンクリートより、養生直後の脱型時の強
度は、小さくなるのが普通である。これらの問題点を解
決するために、通常セメントの凝結硬化促進剤が使用さ
れ、例えば亜硝酸塩を併用することが知られている。
（特公昭６１−５６１７６号公報）。しかしながら、こ
の場合コンクリート温度、前置き養生温度、昇温時間及
び最高保持温度等によつては、短時間強度を促進するあ
まり、結果としてC3Sの水和量を押える為、得られるべ
き絶対強度の低下を招く場合があつた。However, apart from piles and poles, humor tubes, precast products, etc. have the minimum necessary steam curing (for example, from ventilation to obtain the strength required for demolding in order to improve the mold rotation rate and economic efficiency. However, the effect of addition of gypsophilus (Ettringite is completed within 1 to 3 hours after aeration) is not fully exerted due to insufficient hydration of C 3 S in cement. In addition, the strength at the time of demolding immediately after curing is usually smaller than that of unadded concrete. In order to solve these problems, a setting hardening accelerator for cement is usually used, and it is known to use nitrite together.
(Japanese Patent Publication No. 61-56176). However, in this case, depending on the concrete temperature, pre-curing temperature, heating time, maximum holding temperature, etc., the strength for a short time is promoted too much, and as a result, the hydration amount of C 3 S is suppressed, so the absolute strength to be obtained should be May cause a decrease in
本発明者らは、単に上記問題点を解決するだけでなく、
もつと大きな視野に立つて、(1)C3Sの水和反応を過度に
遅延しない範囲で、短時間の養生でも優れた強度発現効
果を得る。(2)養生時間が充分でセツコウ類１０〜１３
重量％添加の最高強度が得られる条件においても、さら
に大きな強度を得ることができること。(3)従来と同一
強度効果を得るのにセツコウ類の添加量を少なくするこ
と。という研究目的を持ち、鋭意検討した結果セツコウ
類に適量のホウ素化合物を配合したものを混和材として
コンクリートに添加することにより目的が達成されると
いう知見を得、本発明を完成するに到つた。The present inventors not only solve the above problems,
Therefore, (1) within a range that does not excessively delay the hydration reaction of C 3 S, an excellent strength-producing effect can be obtained even by curing for a short time. (2) Curing time is enough, and euglena 10-13
Even under the condition that the maximum strength of addition by weight% is obtained, even greater strength can be obtained. (3) To obtain the same strength effect as the conventional one, reduce the amount of Gypsophila added. As a result of earnest studies, the inventors have obtained the finding that the purpose can be achieved by adding an appropriate amount of a boron compound to gypsophilus as an admixture to concrete, and completed the present invention.
即ち、本発明は、セッコウ類15重量部以下と、ホウ素化
合物0.005〜0.1重量部とを混合してなるセメント混和材
であり、セメントと該セメント混和材とを含有してなる
セメント組成物である。That is, the present invention is a cement admixture consisting of 15 parts by weight or less of gypsum and 0.005 to 0.1 parts by weight of a boron compound, which is a cement composition containing cement and the cement admixture. .
以下、詳しく本発明を説明する。Hereinafter, the present invention will be described in detail.
本発明のセツコウ類とは硬セツコウ（II型無水セツコ
ウ）、２水セツコウ（以下２水という）、半水セツコウ
（以下半水という）、可溶性無水セツコウ（III型無水
セツコウ）（以下可溶性無水という）を示す。そのうち
最も強度的効果の高いのは、硬セツコウであり、弗酸発
生副生セツコウ（以下弗酸セツコウという）や他の２
水、半水、可溶性無水を、工業的には３５０℃以上で焼
成して得られるものである。セツコウ類の粒度等は特に
限定されるものではなく、通常入手できるものであれば
充分使用可能である。The Setsukou of the present invention means hard Setsukou (II type anhydrous Setsukou), 2 water Setsukou (hereinafter referred to as 2 water), hemihydrate Setsukou (hereinafter referred to as semiwater), soluble anhydrous Setsukou (III type anhydrous Setsukou) (hereinafter referred to as soluble anhydrous). ) Is shown. The most effective of these is hard gypsum, which is a byproduct of hydrofluoric acid generation (hereinafter referred to as hydrous gypsum) and other 2
It is industrially obtained by baking water, semi-water and soluble anhydrous at 350 ° C. or higher. There is no particular limitation on the particle size and the like of the Astragalus, and any commonly available one can be used.
これらセツコウ類の添加量は、セメントに対し多くとも
無水物換算で１５重量％が好ましく、１〜１０重量％が
さらに好ましい。１５重量％を越えても強度発現効果は
大きくならないか、又は、逆に低下する傾向を示すため
好ましくない。The addition amount of these gypsums is preferably at most 15% by weight, and more preferably 1 to 10% by weight in terms of an anhydride with respect to the cement. Even if it exceeds 15% by weight, the strength-producing effect does not become large, or on the contrary, it tends to decrease, which is not preferable.
又、ホウ素化合物（以下ホウ化物という）とは、無水ホ
ウ酸、ホウ酸やメタホウ酸及びそれらのNa，Ｋ，Li，M
g、Zn塩等を示す。これらは、一般的にセメントの凝結遅
延剤（以下遅延剤という）としてよく知られ、又は、実
際に遅延剤の一成分として用いられているものである。Further, the boron compound (hereinafter referred to as boride) means boric anhydride, boric acid or metaboric acid and their Na, K, Li, M.
g, Zn salt, etc. are shown. These are generally well known as set retarders for cement (hereinafter referred to as retarders), or are actually used as one component of retarders.
本発明者らはこの遅延剤をセツコウ類と適量併用するこ
とにより、凝結遅延性が殺され、むしろ促進剤、強度増
進剤的作用を示し、強度的に顕著な効果を示すことを見
いだしたものである。The present inventors have found that when this retarder is used in an appropriate amount in combination with Gypsophila, the retardation of coagulation is killed, and rather, it acts as an accelerator and a strength enhancer, and exhibits a remarkable effect in terms of strength. Is.
ホウ化物の粒度等は特に限定されるものではなく、通常
入手できるものであれば充分使用可能である。ホウ化物
は、セメントに対し０．００５〜０．１重量％となるよ
うセツコウ類と配合されることが好ましく、０．０１〜
０．０８重量％がより好ましく、０．０２〜０．０６が
最も好ましい。０．００５重量％未満では、添加効果は
なく、０．１重量％を越えると、セツコウ類と併用であ
つても凝結遅延性が極端に大きくなり、充分な養生時間
をとつても強度的効果は小さくなる。The particle size and the like of the boride are not particularly limited, and any commonly available boride can be used. The boride is preferably blended with gypsum in an amount of 0.005 to 0.1% by weight with respect to the cement, and 0.01 to
0.08% by weight is more preferable, and 0.02 to 0.06 is most preferable. If it is less than 0.005% by weight, there is no addition effect, and if it exceeds 0.1% by weight, the setting retarding property becomes extremely large even when it is used in combination with gypsum, and the strength effect is obtained even with sufficient curing time. Becomes smaller.
又、セツコウ類の中で半水や可溶性無水は添加量が多く
なると、偽凝結を示すようになり易いが、ホウ化物との
併用で、偽凝結も押えられる傾向が示される。In addition, when the amount of semi-water or soluble anhydrous is large in the Astragalus, it tends to show pseudo-condensation, but when used in combination with boride, the pseudo-condensation tends to be suppressed.
本発明の混和材が使用されるセメントとしては、普通・
早強・超早強等の各種ポルトランドセメント、高炉セメ
ント・フライアツシユセメント等の各種混合セメント等
が挙げられる。As the cement in which the admixture of the present invention is used,
Various portland cements such as early strength and super early strength, various mixed cements such as blast furnace cement and fly ash cement are listed.
又、本発明の混和材の使用方法は、使用する目的によつ
てある配合率のものを添加量の加減で使用しても良い
し、さらに適正配合やそれに伴う経済性を考えコンクリ
ート混練時、別々に添加しても良いものである。Further, the method of using the admixture of the present invention, may be used by adjusting the addition amount of the compounding ratio depending on the purpose of use, in addition concrete mixing when considering the proper mixing and economics accompanying it, It may be added separately.
以下、本発明の効果を実施例にて説明する。 Hereinafter, the effects of the present invention will be described with reference to examples.
実施例１ 表−１のコンクリート配合を用い、セツコウ類とホウ化
物の種類と添加量をかえてコンクリートを混練し、１０
×２０cmのテストピースを成型して、前置きを２０℃
で４時間行つた後３時間で７５℃まで上げ、そのまま４
時間保持し、その後蒸気を止め翌日（２４時間後）まで
放冷した。Example 1 Using the concrete composition shown in Table-1, the concrete was kneaded by changing the types and addition amounts of the gypsum and boride, and
Mold a test piece of × 20 cm and place it at 20 ℃
After 4 hours, raise to 75 ℃ in 3 hours and
After holding for a while, the steam was stopped and the mixture was allowed to cool until the next day (after 24 hours).
圧縮強度の測定は通気後４時間で養生槽から一部取り出
し短時間強度を測定し他は、翌日の脱型強度を測定し
た。The compressive strength was measured by taking out a part of it from the curing tank 4 hours after aeration and measuring the strength for a short time, and the demolding strength on the next day.
使用材料 セメント：電気化学工業（株）製、普通ポルトラ ンドセメント 砂 ：新潟県姫川産川砂 砕 石 ： 〃 砕石 減水剤 ：花王（株）「マイテイ１５０」（商 品名） セツコウ類：硬セツコウ、弗酸セツコウ、粉末度 ４，０００cm2/g ２ 水 、市販工業用 半 水 、２水を１５０℃で３ 時間加熱して得たもの、 可溶性無水、２水を２００℃で３ 時間加熱して得たもの ホウ化物：市販１級試薬 セツコウ類やホウ化物で結晶水を有するものは、全て無
水物換算でセメントに対し外割重量％とした。 Materials used: Cement: Denki Kagaku Kogyo Co., Ltd., ordinary portland cement Sand: Niigata Prefecture Himekawa-produced river sand Crushed stone: 〃 Crushed stone water reducing agent: Kao Corporation “Mighty 150” (trade name) Acid Setsukou, fineness 4,000 cm 2 / g 2 water, commercial industrial semi-water, obtained by heating 2 water at 150 ° C. for 3 hours, soluble anhydrous, 2 water obtained by heating at 200 ° C. for 3 hours Boride: Commercially available first-grade reagents All the gypsum and boride having water of crystallization were used as an anhydride, and the content was calculated as an outer percentage by weight based on the cement.
又、セツコウ類は砂と置き変えて添加した。In addition, Setsukou was added in place of sand.
結果を表−２に示す。The results are shown in Table-2.
表−２中において実験No１〜９，２１は、比較例であ
る。 In Table 2, Experiment Nos. 1 to 9 and 21 are comparative examples.
表−２中より、ホウ化物は、セツコウ類と蒸気養生と併
用することにより、むしろ強度促進剤及び強度増進剤と
して働き顕著な効果が示されることがわかる。ホウ化物
が適量で、セツコウ類が５％以下であれば短時間強度並
びに翌日脱型強度が増大し、硬セツコウ５重量％、ホウ
酸Na０．０３〜0.05重量％では、硬セツコウ単独１０重
量％添加に匹敵する翌日脱型強度が得られた。又、５重
量％を越えると、ホウ化物が適正量でも、短時間強度は
遅れ気味となるが、翌日脱型強度は増大し、目的に応じ
経済的なコンクリート配合の設計が可能となることが示
された。From Table 2, it can be seen that the boride rather acts as a strength enhancer and a strength enhancer and exhibits a remarkable effect when it is used in combination with gypsum and steam curing. If the amount of boride is appropriate and the amount of Setsukou is 5% or less, short-time strength and next-day demolding strength are increased. Hard Setsukou 5 wt%, Na borate 0.03 to 0.05 wt%, hard Setsukou alone 10 wt% The next day demolding strength comparable to the addition was obtained. If it exceeds 5% by weight, the short-term strength tends to be delayed even if the boride is in an appropriate amount, but the next-day demolding strength is increased, which makes it possible to design an economical concrete mix according to the purpose. Was shown.
セツコウ類にホウ化物を配合した本発明のセメント混和
材をコンクリートに添加し蒸気養生をすることによりセ
ツコウ類単独添加より、大きな強度が得られ、単位セメ
ント量、単位減水剤量、単位混和材量などを少くできる
などの経済設計が出来ると同時に、適正なセツコウ類と
ホウ化物の量を選定することにより、短時間強度も改善
でき、型枠の回転率向上など合理的な生産管理が可能と
なつた。By adding the cement admixture of the present invention, which is a boride compound to Setsukou, to concrete and performing steam curing, greater strength can be obtained than by adding Setsukou alone, unit cement amount, unit water reducing agent amount, unit admixture amount It is possible to economically design such as reducing the number of such things, and at the same time, by selecting the proper amount of gypsum and boride, the strength for a short time can be improved, and rational production management such as improvement of mold rotation rate is possible. Natsuta.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 22:08） Ｚ 2102−4Ｇ (56)参考文献 特開 昭61−63558（ＪＰ，Ａ) 特公 昭57−22907（ＪＰ，Ｂ２)─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C04B 22:08) Z 2102-4G (56) Reference JP-A-61-63558 (JP, A) Japanese Examined Japanese Patent Sho 57-22907 (JP, B2)
Claims (2)
0.005〜0.1重量部とを混合してなるセメント混和材。1. A gypsum of 15 parts by weight or less and a boron compound
A cement admixture made by mixing with 0.005 to 0.1 part by weight.
ント混和材とを含有してなるセメント組成物。2. A cement composition comprising cement and the cement admixture according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62081015A JPH0625008B2 (en) | 1987-04-03 | 1987-04-03 | Cement admixture and cement composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62081015A JPH0625008B2 (en) | 1987-04-03 | 1987-04-03 | Cement admixture and cement composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63248757A JPS63248757A (en) | 1988-10-17 |
| JPH0625008B2 true JPH0625008B2 (en) | 1994-04-06 |
Family
ID=13734672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62081015A Expired - Fee Related JPH0625008B2 (en) | 1987-04-03 | 1987-04-03 | Cement admixture and cement composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0625008B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120247469A (en) * | 2025-04-03 | 2025-07-04 | 广西南宁劳吉斯环保科技有限公司 | A cement-based building material with no alkali reversion |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5932416B2 (en) * | 1973-01-23 | 1984-08-08 | 博 穀田 | Heat-hardening hydraulic bonding material and its molding method |
| JPS5722907A (en) * | 1980-07-15 | 1982-02-06 | Nissan Motor Co Ltd | Ventilation structure of automobile |
| JPS6163558A (en) * | 1984-09-03 | 1986-04-01 | 大阪セメント株式会社 | Manufacture of centrifugally molded steel composite concretemember using high strength admixing material |
-
1987
- 1987-04-03 JP JP62081015A patent/JPH0625008B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63248757A (en) | 1988-10-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2788834B2 (en) | Hydraulic cement hardening accelerating admixture incorporating glycol | |
| JP2014148434A (en) | Hydraulic composition | |
| CN105658599A (en) | Binder comprising calcium sulfoaluminate cement and a magnesium compound | |
| JP3547268B2 (en) | Cement admixture and cement composition | |
| JP7542130B2 (en) | Cement admixture, cement composition, and method for producing concrete product | |
| JP4612134B2 (en) | Early strength cement admixture and concrete and concrete product containing the same | |
| JPH066499B2 (en) | Quick setting agent for cement | |
| US11845695B2 (en) | Accelerator for mineral binder compositions | |
| JP2000344561A (en) | Cement admixture and cement composition | |
| CN110698088A (en) | A kind of retarded Portland cement and preparation method thereof | |
| JPH059049A (en) | Cement admixture and cement composition | |
| JP3483117B2 (en) | Quick setting material, spray material, and quick setting spray concrete | |
| JPH1190918A (en) | Method of manufacturing concrete products | |
| JP2968868B2 (en) | Cement admixture and cement composition | |
| JPH0625008B2 (en) | Cement admixture and cement composition | |
| JP2020180024A (en) | A cement composition for high-temperature curing and a method for producing a cured product of a cement composition using the same, which suppresses sulfate deterioration. | |
| JPH0649602B2 (en) | Cement admixture for heat curing | |
| JPH0643265B2 (en) | Quick-setting cement composition | |
| JP2501638B2 (en) | Centrifugal molding single mouth reducing agent and method for producing centrifugal molding using the same | |
| JP3729317B2 (en) | Quick hardening cement concrete and quick setting cement concrete | |
| JP4484311B2 (en) | Cement admixture and cement composition | |
| JP7701168B2 (en) | Cement concrete admixture, cement composition, and hardened product | |
| JP3378965B2 (en) | Method for improving strength of hardened cement | |
| JPH0625009B2 (en) | Cement admixture and cement composition | |
| JP2006062888A (en) | Quick-hardening admixture and quick-hardening cement composition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |