JPH0524872B2 - - Google Patents
Info
- Publication number
- JPH0524872B2 JPH0524872B2 JP21503686A JP21503686A JPH0524872B2 JP H0524872 B2 JPH0524872 B2 JP H0524872B2 JP 21503686 A JP21503686 A JP 21503686A JP 21503686 A JP21503686 A JP 21503686A JP H0524872 B2 JPH0524872 B2 JP H0524872B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- powder
- weight
- water
- ptfe
- 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 - Lifetime
Links
- 239000004568 cement Substances 0.000 claims description 43
- 239000000843 powder Substances 0.000 claims description 43
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 28
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 24
- 239000011398 Portland cement Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 7
- -1 polytetrafluoroethylene Polymers 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 239000007900 aqueous suspension Substances 0.000 claims description 5
- 238000010008 shearing Methods 0.000 claims description 5
- 238000010298 pulverizing process Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 27
- 239000004567 concrete Substances 0.000 description 9
- 238000004898 kneading Methods 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 239000002689 soil Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 4
- 230000002776 aggregation Effects 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 239000000123 paper Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【発明の詳細な説明】
イ 発明の目的
産業上の利用分野
本発明は、混練時間の短縮およびコンクリート
等のセメント硬化物の強度の向上が期待できる分
散性がよいセメント系粉体組成物およびの製造法
に関するものである。Detailed Description of the Invention A. Purpose of the Invention Industrial Field of Application The present invention provides a cement powder composition with good dispersibility that can be expected to reduce kneading time and improve the strength of hardened cement products such as concrete. It concerns the manufacturing method.
従来の技術
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、シリカセメント及びそれらに
さらに製銃スラグ、製鋼スラグ等の適当な粉体を
混合して成るポルトランドセメント系組成物は、
各種コンクリート構造物のほか、軟弱地盤の改良
（土質改良）用などの大量に使用されている。BACKGROUND ART Portland cement compositions are made by mixing Portland cement, blast furnace cement, fly-ash cement, silica cement, and appropriate powders such as gun-making slag and steel-making slag.
In addition to various concrete structures, it is used in large quantities for improving soft ground (soil quality improvement).
セメントコンクリートは、骨材等をセメント粉
体に混合し、水を加えて均一に混練して製造する
が、コンクリートの性質は材料の性質および配合
によつて著しく変化する。しかし空気量がほぼ同
じであれば、ある工事条件おけるコンクリートの
強度や耐久性は水とセメントとの比率（Ｗ／Ｃ
比）によつて決まると言われており、セメントの
硬化反応を起こさせるに必要な理論所要水量にで
きるだけ近ずけるのが理想的である。 Cement concrete is manufactured by mixing aggregate, etc. with cement powder, adding water, and kneading the mixture uniformly, but the properties of concrete vary significantly depending on the properties and composition of the materials. However, if the amount of air is approximately the same, the strength and durability of concrete under certain construction conditions will be determined by the ratio of water to cement (W/C).
Ideally, it should be as close as possible to the theoretical amount of water required to cause the cement hardening reaction.
均一でよいコンクリートを作るためには配合物
が均一組成になるまで十分練り混ぜる必要がある
が、セメント粉体は乾燥状態ではセメント粒子が
互いに引き合つてフロツクを作つており、これに
水を加えただけではセメント粒子は分散せず、水
は添加された場所で局所的に吸収されたりするの
で、セメント粒子を分散させるため、およびワー
カビリテイを高めるために、理論所要量の２倍前
後もの水を加え、十分に時間をかけて混練してい
るのが実態である。 In order to make uniform and good concrete, it is necessary to thoroughly mix the mixture until it has a uniform composition, but when cement powder is dry, the cement particles attract each other to form flocs, and water is added to this. If water is added alone, the cement particles will not be dispersed, and the water will be absorbed locally at the place where it is added. Therefore, in order to disperse the cement particles and improve workability, approximately twice the theoretically required amount of water is added. In addition, the reality is that sufficient time is spent on kneading.
その結果、混練に長時間を要し、乾燥に伴う硬
化体の収縮により亀裂が発生することがあり、強
度も添加水量の多いものほど低くなる。 As a result, kneading takes a long time, cracks may occur due to shrinkage of the cured product as it dries, and the strength decreases as the amount of water added increases.
また軟弱地盤の改良には、分散性が良好でない
ため、乾燥セメントが用いられることは少なく、
予め水とよく混合して分散をよくしたスラリーが
用いられることが多い。 In addition, dry cement is rarely used to improve soft ground because it does not have good dispersibility.
A slurry that has been thoroughly mixed with water to improve dispersion is often used.
高含水比の軟弱地盤の改良に、乾燥粉末を用い
れば、土の含水比低減による改良効果も期待でき
るのに、高含水比土に、予め水を加えたスラリー
を用いるのは合理的、経済的でない。 If dry powder is used to improve soft ground with a high moisture content, it can be expected to have an improvement effect by reducing the moisture content of the soil, but it is rational and economical to use a slurry that has been added with water to the soil with a high moisture content. Not on target.
発明が解決しようとする問題点
本発明は、セメント系粉体組成物を分散性がよ
いものとすることにより、上記のような問題点を
解決することを目的とする。Problems to be Solved by the Invention The present invention aims to solve the above-mentioned problems by providing a cement powder composition with good dispersibility.
ロ 発明の構成
問題点を解決するための手段
本発明に係る分散性がよいセメント系粉体組成
物は、ポルトランドセメントを主成分とする粉体
100重量部当りフイブリル化されたポリテトラフ
ルオロエチレン0.01〜1.0重量部を含有している
ことを特徴とする。B Means for solving the structural problems of the invention The cement-based powder composition with good dispersibility according to the present invention is a powder mainly composed of Portland cement.
It is characterized by containing 0.01 to 1.0 parts by weight of fibrillated polytetrafluoroethylene per 100 parts by weight.
ポリテトラフルオロエチレン（以下PTFEと言
う）は化学的に不活性で、揆水性であり、摩擦係
数が低く、非粘着性が高いなど特異な性質を有し
ている。またPTFEは適当な温度条件（50℃以上
320℃以下）ではフイブリル（繊維）化し易く、
その直径は数十Å程度と非常に微細なものであ
る。従つてPTFEを粉体中に分散しフイブリル化
すれば、ごく少量のPTFEで本発明の分散性がよ
いセメント系粉体組成物が得られる。 Polytetrafluoroethylene (hereinafter referred to as PTFE) has unique properties such as being chemically inert, water-repellent, having a low coefficient of friction, and being highly non-adhesive. In addition, PTFE can be used under appropriate temperature conditions (50°C or higher).
(below 320℃), it tends to become fibrillated,
Its diameter is extremely small, on the order of several tens of angstroms. Therefore, by dispersing PTFE in powder and fibrillating it, the cement-based powder composition of the present invention with good dispersibility can be obtained with a very small amount of PTFE.
ポルトランドセメントを主成分とする粉体100
重量部当りのフイブリル化されたPTFE含有量が
0.01重量部以下では効果が少なく、また1.0重量
部以上含有させることはコストの面で実用的でな
い。 Powder 100 whose main component is Portland cement
Fibrillated PTFE content per part by weight
If it is less than 0.01 part by weight, the effect is small, and if it is contained more than 1.0 part by weight, it is not practical in terms of cost.
かかる分散性がよいセメント系粉体組成物の効
果的な製造法は、50℃以上320℃以下の温度を保
持している状態のポルトランドセメントを主成分
とする粉体100重量部に対し、PTFE0.01〜1.0重
量部を粉末又は水性懸濁液の形態で添加し、剪断
力を加えるように混和することである。 An effective method for producing such a cement-based powder composition with good dispersibility is to add PTFE0 to 100 parts by weight of powder whose main component is Portland cement, which is maintained at a temperature of 50°C or higher and 320°C or lower. Add .01 to 1.0 parts by weight in the form of a powder or aqueous suspension and mix under shear.
ポルトランドセメント製造工程では、焼成を終
つたクリンカーは空気で急冷され、石膏等の添加
材を加えた後、仕上ミルで粉砕され粒度調整され
て最終製品となるが、クリンカーの残熱および仕
上ミル内での粉砕熱により仕上げミルを出た最終
製品は夏期120℃程度、冬期でも約100℃の残熱を
有する。 In the Portland cement manufacturing process, the clinker after firing is rapidly cooled with air, and after adding additives such as gypsum, it is crushed in a finishing mill to adjust the particle size and become the final product. The final product leaving the finishing mill has a residual heat of around 120°C in summer and around 100°C in winter due to the heat of crushing.
そこで工業的製造に当つては経済性を考慮し、
PTFEのフイブリルが生じ易い温度まで加熱する
エネルギーコストおよび加熱装置を省略する目的
で、製造工程の仕上げミルにおける粉砕および粒
度調整を径た後、50℃以上320℃以下の温度を保
持している状態のポルトランドセメントを主成分
とする粉体100重量部に対し、PTFE0.01〜1.0重
量部を粉末又は水性懸濁液の形態で添加し、剪断
力を加えるように混和すれば分散性がよいセメン
ト系粉体組成物を合理的且つ経済的に製造するこ
とができる。 Therefore, when manufacturing industrially, we consider economic efficiency.
In order to avoid the energy cost and heating equipment required to heat the product to a temperature where PTFE fibrils are likely to occur, the temperature is maintained at a temperature of 50°C or more and 320°C or less after pulverization and particle size adjustment in the finishing mill of the manufacturing process. If you add 0.01 to 1.0 parts by weight of PTFE in the form of powder or aqueous suspension to 100 parts by weight of powder whose main component is Portland cement, and mix it while applying shearing force, you can create cement with good dispersibility. The powder composition can be produced rationally and economically.
剪断力を加えるように混和するとは、ポルトラ
ンドセメントを主成分とする粉体とPTFEの粉末
又は水性懸濁液とを混合すると同時に剪断力を加
えることを言い、実験室の場合にはヘラを使つて
粉体を物にこすりつけるとか、乳鉢と乳棒を用い
てすりつぶすような操作を行えばよく、工業的に
はパドルミキサー、ボールミル、スクリユーコン
ベアーなどの剪断力を与える機器を使用すればよ
い。 Mixing while applying a shearing force means adding a shearing force at the same time as mixing the powder mainly composed of Portland cement and the powder or aqueous suspension of PTFE. In the laboratory, it is done using a spatula. Operations such as rubbing the powder against an object using a grinder or grinding it using a mortar and pestle are sufficient.For industrial use, equipment that applies shearing force such as a paddle mixer, ball mill, or screw conveyor may be used.
作 用
本発明の分散性がよいセメント系粉体組成物に
おいては、揆水性のPTFEの微細なフイブリル
（繊維）が粉体中に縦横に存在して粉体を包み込
んだ状態になつている。Function In the cement-based powder composition of the present invention with good dispersibility, fine fibrils (fibers) of water-repellent PTFE exist in the powder vertically and horizontally, enveloping the powder.
このような組成物に水を添加すると、水は添加
された場所で局所的にセメントに吸収・分散され
ることなく、まずPTFEの微細なフイブリルを伝
わつて粉体の全域に拡散し、これからフイブリル
に包み込まれている粉体中に分散して行くものと
考えられる。 When water is added to such a composition, the water is not locally absorbed and dispersed into the cement at the place where it is added, but first spreads through the fine fibrils of PTFE and spreads throughout the powder, and then the fibrils. It is thought that the particles are dispersed in the powder that is wrapped in the powder.
あるいは、粉体中に多数分散したPTFEのフイ
ブリルが、セメントの粒子と粒子が引き合つてブ
ロツクを作るのを妨げて、このような現象を生じ
るさせるものとも考えられる。 Alternatively, it is also possible that a large number of PTFE fibrils dispersed in the powder prevent cement particles from attracting each other to form blocks, causing this phenomenon.
以下実施例に基づいて本発明を説明する。 The present invention will be explained below based on Examples.
実施例 １
ポルトランドセメント100重量部に、樹脂固形
分を30重量％含有するPTFEエマルジヨン液を、
固形分として0.05重量部、0.1重量部、0.2重量部、
0.5重量部および1.0重量部含有するよう乳鉢中で
加え、混合した。Example 1 A PTFE emulsion liquid containing 30% by weight of resin solids was added to 100 parts by weight of Portland cement.
0.05 parts by weight, 0.1 parts by weight, 0.2 parts by weight as solid content,
They were added in a mortar to contain 0.5 parts by weight and 1.0 parts by weight and mixed.
混合物を電気乾燥幾中で100℃に加熱した後乳
棒で撹拌し、PTFEをフイブリル化してポルトラ
ンドセメント中に分散した。 The mixture was heated to 100° C. in an electric dryer and then stirred with a pestle to fibrillate the PTFE and disperse it in Portland cement.
これらのサンプル及び比較のためPTFEを加え
ないポルトランドセメントをそれぞれビーカーに
入れ、上方から水を滴下したところ、ポルトラン
ドセメントのみの場合は水滴は滴下場所付近のみ
に滞留しセメント粉体の局所的な団粒化が認めら
れたが、実施例のサンプルの場合はセメント粉体
の局所的な団粒化が認められず、水滴はあたかも
砂に水が吸われるように拡散した。またPTFEフ
イブリル含有量の多い方が拡散速度は早かつた。 When these samples and Portland cement without PTFE were placed in a beaker for comparison and water was dropped from above, it was found that in the case of only Portland cement, the water droplets stayed only near the dropping location, causing local agglomerations of cement powder. Although granulation was observed, in the case of the sample of Example, no local agglomeration of the cement powder was observed, and the water droplets spread as if water were being absorbed by sand. Furthermore, the diffusion rate was faster when the PTFE fibril content was higher.
内径101.6mm、高さ147.5mmの筒の底に厚さ５mm
の円板に13個の小孔を開けた有孔板を取り付け、
有孔板の上にフイルター紙を敷いて、ポルトラン
ドセメント100重量部にフイブリル化された
PTFEを固形分として0.05重量部又は0.1重量部含
有するサンプルと、フイブリル化PTFEを含有し
ないサンプルをそれぞれ同量（高さ63.5mmまで）
入れ、表面にフイルター紙を敷いて、その上に水
道水を高さ84mmのレベルで一定になるように注水
してセメント中に水を浸透させ、注水開始から有
孔板の小孔から水が滴下するまでの時間を測定し
た。フイブリル化PTFEを含有しないサンプルで
は15秒であつたのに対し、フイブリル化PTFEを
固形分として0.05重量部含有するサンプルでは
101秒、0.1重量部含有するサンプルでは68秒であ
つた。 5mm thick at the bottom of the tube with an inner diameter of 101.6mm and a height of 147.5mm.
Attach a perforated plate with 13 small holes to the circular plate.
Filter paper was spread on a perforated plate and fibrillated with 100 parts by weight of Portland cement.
Same amount of sample containing 0.05 part by weight or 0.1 part by weight of PTFE as solid content and sample not containing fibrillated PTFE (up to 63.5 mm in height)
Place filter paper on the surface, pour tap water on top of it at a constant level of 84 mm to infiltrate the cement, and from the start of water pouring water flows out from the small holes in the perforated plate. The time taken to drip was measured. It was 15 seconds for the sample without fibrillated PTFE, whereas it was 15 seconds for the sample containing 0.05 parts by weight of fibrillated PTFE as a solid content.
101 seconds, and 68 seconds for the sample containing 0.1 part by weight.
実施例 ２
冷却を経たセメントクリンカーの粉砕をする仕
上げミルで適量の石膏を加え、微粉砕してポルト
ランドセメントを得た。製品の粒度は88μ標準網
ふるい残分1.1％、ブレーン装置による比表面積
3300cm2／ｇで程度あり、製品温度は100〜120℃で
あつた。Example 2 A suitable amount of gypsum was added to the cooled cement clinker in a finishing mill for pulverization, and the mixture was finely pulverized to obtain Portland cement. Product particle size is 88μ standard mesh sieve residue 1.1%, specific surface area measured by Blaine device
It was approximately 3300 cm 2 /g, and the product temperature was 100 to 120°C.
仕上げミルを出た100〜120℃のポルトランドセ
メントを容積式連続供給機で5T／Ｈの割合で２
軸反転式パドルミキサー（回転数15rpm）に供給
した。 Portland cement at 100-120°C from the finishing mill is fed at a rate of 5T/H by a positive displacement continuous feeder.
It was supplied to a rotating shaft paddle mixer (rotation speed 15 rpm).
同時にPTFE30重量％の水性懸濁液を定量ポン
プで16.7Kg（PTFE固形分５Kg）／Ｈの割合で供
給し、分散混合したところ、PTFEが直ちにフイ
ブリル化し、ポルトランドセメントに均一に分散
され、実施例１の乳鉢で処理したものと同一性状
の粉体組成物を連続して得ることができた。 At the same time, an aqueous suspension of PTFE 30% by weight was supplied using a metering pump at a ratio of 16.7 kg (PTFE solid content 5 kg)/H and dispersed and mixed. As a result, PTFE immediately fibrillated and was uniformly dispersed in Portland cement. A powder composition having the same properties as that processed in mortar No. 1 could be continuously obtained.
この粉体組成物の水拡散性を調べるため、実施
例１と同様な方法で通常のポルトランドセメント
との比較試験を行つた。 In order to examine the water diffusibility of this powder composition, a comparative test with ordinary Portland cement was conducted in the same manner as in Example 1.
まず、それぞれを少量、別々の容器に入れ、水
滴をこれに加えたところ、通常のポルトランドセ
メントでは団粒化が認められたが、実施例２のセ
メント系粉体組成物は団粒化せず、水滴はあたか
も砂に水が吸われるように浸み渡つた。 First, when a small amount of each was placed in separate containers and water droplets were added, agglomeration was observed with ordinary Portland cement, but no agglomeration was observed with the cement powder composition of Example 2. , the water droplets permeated the sand as if it were being absorbed by water.
ハ 発明の効果
セメントのこのような水拡散性に優れた特性は
工学上多くの用途で有効である。C. Effects of the invention Cement's excellent water-diffusivity properties are useful in many engineering applications.
例えば土質安定処理において乾燥セメントを用
いる場合、セメントの水拡散性が良いとセメント
の水和反応が均一に進行するので、処理土の強度
の均一性および向上がはかられる。また均一な混
練を行うための混合時間の短縮が可能になる。セ
メントコンクリート、セメントモルタル、セメン
トグラウトなどにおいても同様の効果がある。 For example, when dry cement is used in soil stabilization treatment, if the cement has good water diffusivity, the hydration reaction of the cement will proceed uniformly, so the strength of the treated soil will be uniform and improved. Furthermore, the mixing time for uniform kneading can be shortened. Similar effects can be found in cement concrete, cement mortar, cement grout, etc.
またセメント粉体が非粘着性の高いPTFEフイ
ブリルに包み込まれているので、セメント使用時
にサイロ、輸送機、包装容器、人体、衣服等へ付
着が少なく、また粉塵の発生が少なくなり、衛生
面からも安全性が高くなるという利点がある。 In addition, since the cement powder is wrapped in highly non-adhesive PTFE fibrils, there is less adhesion to silos, transportation machines, packaging containers, the human body, clothing, etc. when cement is used, and less dust is generated, which improves hygiene. It also has the advantage of increased safety.
またセメントの包装は従来からクラフト紙包装
袋が使用されており、吸湿および風化防止の点で
満足すべきものではないが、ポリエチレン製包装
袋への充填は、ヒートシール面への粉体の付着に
よりシール強度が低くなり困難であるため実用化
されていなかつた。しかし本発明による粉体組成
物は、付着性が小さいのでヒートシール面への粉
体の付着が抑えられ、容易にポリエチレン製包装
袋に充填しシールすることができ、吸湿、風化防
止が完全となり貯蔵性が著しく向上するなどのメ
リツトが期待できる。 In addition, kraft paper packaging bags have traditionally been used for cement packaging, and although they are not satisfactory in terms of moisture absorption and weathering prevention, filling into polyethylene packaging bags is difficult due to the adhesion of powder to the heat-sealed surface. It has not been put into practical use because the sealing strength is low and it is difficult. However, since the powder composition according to the present invention has low adhesion, adhesion of the powder to the heat-sealed surface is suppressed, and it can be easily filled and sealed into polyethylene packaging bags, and is completely prevented from absorbing moisture and weathering. Benefits such as significantly improved storage performance can be expected.
またPTFEフイブリルセメントは揆水性なの
で、それに包み込まれているセメント粉体の吸湿
性を低下する。 Furthermore, since PTFE fibrillar cement is water-repellent, it reduces the hygroscopicity of the cement powder encapsulated in it.
以上の本発明の効果を列挙すれば、
分散性がよいので、混練時にセメントに対す
る水の使用量を減らすことができ、混練時間を
短縮できる。 To enumerate the effects of the present invention as described above, since the dispersibility is good, the amount of water used for cement during kneading can be reduced, and the kneading time can be shortened.
水の使用量を減らすことができれば、同一セ
メントの使用量に対するコンクリート強度が増
加する。別の観点からは、同一のコンクリート
強度を出すに必要なセメント量を減らすことが
できる。 If the amount of water used can be reduced, the strength of concrete will increase for the same amount of cement used. From another point of view, the amount of cement required to produce the same concrete strength can be reduced.
サイロ、輸送機、包装容器、人体、衣服等へ
付着が少なく、また粉塵の発生が少ない。 There is less adhesion to silos, transportation machines, packaging containers, the human body, clothing, etc., and less dust is generated.
ポリエチレン製包装袋への充填が可能にな
る。 It becomes possible to fill polyethylene packaging bags.
セメント粉体の吸湿性が低下するので保存性
がよい。 It has good storage stability because the hygroscopicity of cement powder is reduced.
高含水比軟弱地盤の改良等に、スラリーとせ
ずに含水比低減効果もある粉末セメントとして
の使用が可能になる。 It can be used as a powdered cement, which also has the effect of reducing the water content, without making it into a slurry, for improving soft ground with a high water content.
Claims (1)
100重量部当りフイブリル化されたポリテトラフ
ルオロエチレン0.01〜1.0重量部を含有している
ことを特徴とする分散性がよいセメント系粉体組
成物。 ２ 製造工程の仕上げミルにおける粉砕および粒
度調整を経た後、50℃以上320℃以下の温度を保
持している状態のポルトランドセメントを主成分
とする粉体100重量部に対し、ポリテトラフルオ
ロエチレン0.01〜1.0重量部を粉末又は水性懸濁
液の形態で添加し、剪断力を加えるように混和す
ることを特徴とする分散性のよいセメント系粉体
組成物の製造法。[Claims] 1. Powder whose main component is Portland cement
A cement powder composition with good dispersibility, characterized in that it contains 0.01 to 1.0 parts by weight of fibrillated polytetrafluoroethylene per 100 parts by weight. 2 After pulverization and particle size adjustment in the finishing mill of the manufacturing process, 0.01 part of polytetrafluoroethylene is added to 100 parts by weight of powder whose main component is Portland cement, which is maintained at a temperature of 50°C or higher and 320°C or lower. A method for producing a cementitious powder composition with good dispersibility, characterized by adding ~1.0 part by weight in the form of a powder or aqueous suspension and mixing while applying a shearing force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21503686A JPS6374946A (en) | 1986-09-13 | 1986-09-13 | High dispersibility cementitious powdery composition and manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21503686A JPS6374946A (en) | 1986-09-13 | 1986-09-13 | High dispersibility cementitious powdery composition and manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6374946A JPS6374946A (en) | 1988-04-05 |
| JPH0524872B2 true JPH0524872B2 (en) | 1993-04-09 |
Family
ID=16665691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21503686A Granted JPS6374946A (en) | 1986-09-13 | 1986-09-13 | High dispersibility cementitious powdery composition and manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6374946A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102920568A (en) * | 2012-10-30 | 2013-02-13 | 浙江工业大学 | Bending joint of finger rehabilitation device based on double pneumatic flexible actuators |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5275655A (en) * | 1992-11-17 | 1994-01-04 | Cer-Con, Inc. | Cementitious composition with nonadherent surface |
| JPH0834649A (en) * | 1994-03-03 | 1996-02-06 | Atom Energ Corp Of South Africa Ltd | Composite material and its preparation |
| JP4117956B2 (en) | 1998-12-24 | 2008-07-16 | 麻生ラファージュセメント株式会社 | Dust-proof cement composition with improved strength |
| JP4412832B2 (en) * | 2000-08-23 | 2010-02-10 | 麻生ラファージュセメント株式会社 | Dust-proof treatment method for dust-generating powder |
-
1986
- 1986-09-13 JP JP21503686A patent/JPS6374946A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102920568A (en) * | 2012-10-30 | 2013-02-13 | 浙江工业大学 | Bending joint of finger rehabilitation device based on double pneumatic flexible actuators |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6374946A (en) | 1988-04-05 |
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