JPH01145357A - Low shrinkage cement composition - Google Patents
Low shrinkage cement compositionInfo
- Publication number
- JPH01145357A JPH01145357A JP30158387A JP30158387A JPH01145357A JP H01145357 A JPH01145357 A JP H01145357A JP 30158387 A JP30158387 A JP 30158387A JP 30158387 A JP30158387 A JP 30158387A JP H01145357 A JPH01145357 A JP H01145357A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- shrinkage
- reducing agent
- cement composition
- 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.)
- Pending
Links
- 239000004568 cement Substances 0.000 title claims abstract description 40
- 239000000203 mixture Substances 0.000 title claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 13
- -1 glycol ester Chemical class 0.000 claims abstract description 4
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 229910000519 Ferrosilicon Inorganic materials 0.000 abstract description 3
- 239000006227 byproduct Substances 0.000 abstract description 3
- 239000004576 sand Substances 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 2
- 238000004040 coloring Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 239000011863 silicon-based powder Substances 0.000 abstract 1
- 239000000047 product Substances 0.000 description 8
- 239000003513 alkali Substances 0.000 description 4
- 239000003365 glass fiber Substances 0.000 description 4
- 239000012779 reinforcing material Substances 0.000 description 4
- 239000004567 concrete Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007573 shrinkage measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Landscapes
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本発明は低収縮性セメント組成物、特に耐アルカリガラ
ス繊維等の補強材で補強されたセメント(GRC)の製
造に適したセメント組成物に係るものである。Detailed Description of the Invention [Industrial Application Field] The present invention provides a low shrinkage cement composition, particularly a cement composition suitable for producing cement reinforced with reinforcing materials such as alkali-resistant glass fibers (GRC). This is related.
[従来の技術]
GRCは本来高強度であるが重量が大となるセメント製
品に代り耐アルカリ性硝子繊維等の補強材をセメント中
に混入せしめることにより、セメント本来の強度より高
強度を現出せしめると共にその重量を大幅に軽くしよう
とするものであり、各種建築材料として使用されつつあ
る。[Conventional technology] GRC is a cement product that is inherently high in strength but heavy, but instead of a cement product, a reinforcing material such as alkali-resistant glass fiber is mixed into the cement, making it stronger than the original strength of cement. At the same time, it is intended to significantly reduce its weight, and it is being used as a variety of building materials.
この様なGRCに用いられるセメント組成としては、従
来セメント、砂、水、減水剤等て構成され、高強度を現
出させる為、通常のコンクリート製品に比してかなりセ
メントの使用量が多くなっている。The cement composition used for such GRC is conventionally composed of cement, sand, water, water reducing agent, etc., and in order to achieve high strength, the amount of cement used is considerably higher than that of ordinary concrete products. ing.
[発明の解決しようとする問題点]
しかしながら、セメントは水和反応の過程て収縮を起し
、又硬化体は湿潤、乾燥により寸法変化を起すことはよ
く知られており、これらの変化量は七゛メント量が多い
程大きい。[Problems to be solved by the invention] However, it is well known that cement shrinks during the hydration reaction process, and that the cured product undergoes dimensional changes due to wetting and drying, and the amount of these changes is The larger the amount of 7-ment, the bigger the effect.
この為、GRCを製造する場合、これらの寸法変化を考
慮して設計せねばならず、精密寸法が要求されたり、タ
イル打込みパネルや大型パネルの製造に対してはかなり
の制約が要求される欠点があった。For this reason, when manufacturing GRC, the design must take these dimensional changes into account, and the drawback is that precise dimensions are required, and considerable restrictions are required for manufacturing tiled panels and large panels. was there.
勿論、これら寸法変化に対処する目的で収縮低減剤を添
加することも試みられているが、何れもそれ程有効な改
・善は発現されていない。Of course, attempts have been made to add shrinkage reducing agents for the purpose of dealing with these dimensional changes, but none of these have resulted in very effective improvements.
[問題点を解決するための手段]
本発明者はこれらの実情に鑑み、セメント組成物の寸法
変化を極力低減せしめることを目的として種々研究、検
討した結果、セメント中に収縮低減剤と共にシリカ分を
添加せしめることにより前記目的を達成し得ることを見
出した。[Means for Solving the Problems] In view of these circumstances, the present inventor conducted various studies and examinations with the aim of reducing dimensional changes in cement compositions as much as possible. It has been found that the above object can be achieved by adding .
かくして本発明は、セメント中に活性シリカ粉及び収縮
低減剤を添加せしめたことを特徴とする低収縮性セメン
ト組成物を提供するにある。Thus, the present invention provides a low-shrinkage cement composition characterized in that activated silica powder and a shrinkage-reducing agent are added to the cement.
本発明において用いられる活性シリカ粉の量は、セメン
トに対し、一般に5〜40重量%程度を採用するのが適
当である。The amount of activated silica powder used in the present invention is generally about 5 to 40% by weight based on cement.
使用量が前記範囲に満たない場合には、収縮低減剤と相
俟って有効にセメント硬化体の寸法変化を低減し難く、
逆に前記範囲を超える場合には硬化が不十分となり、又
収縮の抑制効果が期待し得なくなる虞れがあるので何れ
も好ましくない、そしてこれら範囲のうちセメントに対
して5〜20重量%を採用する場合には高強度孔寸法変
化の最も少ないセメント硬化体を得ることが出来るので
特に好ましい。If the amount used is less than the above range, it will be difficult to effectively reduce the dimensional change of the hardened cement together with the shrinkage reducing agent.
On the other hand, if it exceeds the above range, curing will be insufficient and the effect of suppressing shrinkage may not be expected, so it is not preferable. When this method is adopted, it is particularly preferable because it is possible to obtain a cement hardened body with high strength and minimal change in pore size.
かかる活性シリカ粉としては、種々用い得るが、無定形
のシリカ、とりわけメタルシリコンやフェロシリコンの
製造時に副産物として得られる無定形のシリカ微粉末が
好適である。Various types of activated silica powder can be used, but amorphous silica, particularly amorphous fine silica powder obtained as a by-product during the production of metal silicon or ferrosilicon, is suitable.
他方、本発明に用いられる収縮低減剤の量は、セメント
に対し、一般に0.5〜6重量%程度を採用するのが適
当である。使用量が前記範囲に満たない場合には有効に
セメント硬化体の寸法変・化を低減し難く、逆に前記範
囲を超える場合には硬化が不十分となり、又収縮の抑制
効果が期待し得なくなる虞れがあるので何れも好ましく
ない、そしてこれら範囲のうちセメントに対して1〜4
重量%を採用する場合には高強度孔寸法変化の最も少な
いセメント硬化体を得ることが出来るので特に好ましい
。On the other hand, the amount of the shrinkage reducing agent used in the present invention is generally about 0.5 to 6% by weight based on the cement. If the amount used is less than the above range, it will be difficult to effectively reduce the dimensional changes and changes in the hardened cement product.On the other hand, if it exceeds the above range, curing will be insufficient and an effect of suppressing shrinkage may not be expected. None of these are preferable because there is a risk that the cement will disappear.
It is particularly preferable to use % by weight because it is possible to obtain a hardened cement with high strength and minimal change in pore size.
かかる収縮低減剤としては種々のものを用い得るが、と
りわけ低級アルコールアルキレンオキシド系、グリコー
ルエステル系等の収縮低減剤は効果的である。Various types of shrinkage reducing agents can be used, but shrinkage reducing agents such as lower alcohol alkylene oxide type and glycol ester type are particularly effective.
本発明によるセメント組成物は特にGRC用に好適であ
るが、これに限らず通常のコンクリート製品用或は、モ
ルタル組成物等低収縮性の要求されるコンクリート製品
に適宜用いることが出来る。The cement composition according to the present invention is particularly suitable for GRC, but is not limited thereto, and can be appropriately used for ordinary concrete products or concrete products requiring low shrinkage such as mortar compositions.
又、本発明によるセメント組成物は前述の組成のみなら
ず、例えば適宜な骨材や砂、着色材等本発明の目的を実
質的に阻害しない限り適宜な添加物を添加することが可
能である。In addition, the cement composition according to the present invention may contain not only the above-mentioned composition, but also suitable additives, such as suitable aggregates, sand, and colorants, as long as they do not substantially impede the purpose of the present invention. .
又、 GR(:用に用いられる場合、その補強材として
例えば耐アルカリ性ガラス繊維、スチール繊維、カーボ
ン繊維、アラミド繊維、ビニロン繊維等をチョップトス
トランド状、ロービング状、マット状等の適宜な形態で
用い得ることが出来、その使用量も特に制限されるもの
でない。In addition, when used for GR (:), as reinforcing materials, for example, alkali-resistant glass fibers, steel fibers, carbon fibers, aramid fibers, vinylon fibers, etc. are used in an appropriate form such as chopped strands, rovings, mats, etc. The amount used is not particularly limited.
更に本発明に用いられるセメントとしてはこれも特に限
定はなく、普通ポルトランドセメントをはじめとし各種
のセメントを適宜採用することが出来る。Further, the cement used in the present invention is not particularly limited, and various cements including ordinary Portland cement can be appropriately employed.
[実施例]
表1に示した如き組成調合し、耐アルカリ性ガラス繊維
のチョップトストランドを補強材として混入し、通常の
ダイレクトスプレー法にて作成した200 mix 2
0G mmX 10m■の試料につき湿乾収縮率を測定
した結果を表1に示すと共に、乾燥収縮の結果を第1図
に示した。[Example] 200 mix 2 was prepared by mixing the composition as shown in Table 1, mixing chopped strands of alkali-resistant glass fiber as a reinforcing material, and using a normal direct spray method.
Table 1 shows the results of wet-dry shrinkage measurements for samples of 0 G mm x 10 m, and FIG. 1 shows the dry shrinkage results.
又、比較例として表1に示した組成を夫々実施例と同様
にして得た試料の測定結果も併せて表1及び第1図に示
した。Table 1 and FIG. 1 also show the measurement results of samples obtained as comparative examples having the compositions shown in Table 1 in the same manner as in the Examples.
尚、用いた活性シリカ粉は何れもフェロシリコン製造時
に副生じた平均粒径o、ts、tのものであり、又収縮
低減剤は低級アルコールアルキレンオキシド系である日
本セメント社製商品名テトラガートを用いた。The activated silica powders used were those with average particle diameters o, ts, and t, which were generated as a by-product during the production of ferrosilicon, and the shrinkage reducing agent was a lower alcohol alkylene oxide based product called Tetragat manufactured by Nippon Cement Co., Ltd. Using.
表1Table 1
第1図は本発明の一例による低収縮性セメント組成物が
有する乾燥収縮性及び比較例が有するそれを示す図であ
る。FIG. 1 is a diagram showing the drying shrinkage of a low-shrinkage cement composition according to an example of the present invention and that of a comparative example.
Claims (1)
しめたことを特徴とする低収縮性セメント組成物。 2、活性シリカ粉の添加量は、セメントに対し5〜40
重量%である請求の範囲(1)のセメント組成物。 3、活性シリカ粉は無定形シリカ微粉末である請求の範
囲(1)又は(2)のセメント組成物。 4、収縮低減剤の添加量は、セメントに対し0.5〜6
重量%である請求の範囲(1)のセメント組成物。 5、収縮低減剤は低級アルコールアルキレンオキシド系
収縮低減剤、グリコールエステル系収縮低減剤である請
求の範囲(1)又は(4)のセメント組成物。[Claims] 1. A low-shrinkage cement composition characterized in that activated silica powder and a shrinkage reducing agent are added to cement. 2. The amount of activated silica powder added is 5 to 40% of cement.
% by weight of the cement composition of claim (1). 3. The cement composition according to claim 1 or 2, wherein the activated silica powder is amorphous silica fine powder. 4. The amount of shrinkage reducing agent added is 0.5 to 6 to cement.
% by weight of the cement composition of claim (1). 5. The cement composition according to claim 1 or 4, wherein the shrinkage reducing agent is a lower alcohol alkylene oxide shrinkage reducing agent or a glycol ester shrinkage reducing agent.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30158387A JPH01145357A (en) | 1987-12-01 | 1987-12-01 | Low shrinkage cement composition |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30158387A JPH01145357A (en) | 1987-12-01 | 1987-12-01 | Low shrinkage cement composition |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01145357A true JPH01145357A (en) | 1989-06-07 |
Family
ID=17898694
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP30158387A Pending JPH01145357A (en) | 1987-12-01 | 1987-12-01 | Low shrinkage cement composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01145357A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5556460A (en) * | 1995-09-18 | 1996-09-17 | W.R. Grace & Co.-Conn. | Drying shrinkage cement admixture |
US5603760A (en) * | 1995-09-18 | 1997-02-18 | W. R. Grace & Co.-Conn. | Cement admixture capable of inhibiting drying shrinkage and method of using same |
US5604273A (en) * | 1995-09-18 | 1997-02-18 | W. R. Grace & Co.-Conn. | Drying shrinkage cement admixture |
US5622558A (en) * | 1995-09-18 | 1997-04-22 | W.R. Grace & Co.-Conn | Drying shrinkage cement admixture |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637259A (en) * | 1979-08-30 | 1981-04-10 | Sanyo Chemical Ind Ltd | Cement contraction reducing agent |
JPS6042260A (en) * | 1983-08-10 | 1985-03-06 | 山陽国策パルプ株式会社 | Admixing agent for mortar |
-
1987
- 1987-12-01 JP JP30158387A patent/JPH01145357A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637259A (en) * | 1979-08-30 | 1981-04-10 | Sanyo Chemical Ind Ltd | Cement contraction reducing agent |
JPS6042260A (en) * | 1983-08-10 | 1985-03-06 | 山陽国策パルプ株式会社 | Admixing agent for mortar |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5556460A (en) * | 1995-09-18 | 1996-09-17 | W.R. Grace & Co.-Conn. | Drying shrinkage cement admixture |
US5603760A (en) * | 1995-09-18 | 1997-02-18 | W. R. Grace & Co.-Conn. | Cement admixture capable of inhibiting drying shrinkage and method of using same |
US5604273A (en) * | 1995-09-18 | 1997-02-18 | W. R. Grace & Co.-Conn. | Drying shrinkage cement admixture |
US5622558A (en) * | 1995-09-18 | 1997-04-22 | W.R. Grace & Co.-Conn | Drying shrinkage cement admixture |
JPH09110488A (en) * | 1995-09-18 | 1997-04-28 | Wr Grace & Co Connecticut | Improved dry-shrinking cement mixture |
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