JP3438463B2 - Cement-based solidification material that suppresses material separation - Google Patents
Cement-based solidification material that suppresses material separationInfo
- Publication number
- JP3438463B2 JP3438463B2 JP7025796A JP7025796A JP3438463B2 JP 3438463 B2 JP3438463 B2 JP 3438463B2 JP 7025796 A JP7025796 A JP 7025796A JP 7025796 A JP7025796 A JP 7025796A JP 3438463 B2 JP3438463 B2 JP 3438463B2
- Authority
- JP
- Japan
- Prior art keywords
- slurry
- inorganic fine
- fine powder
- cement
- separation
- 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
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
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0082—Segregation-preventing agents; Sedimentation-preventing agents
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)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【発明の詳細な説明】Detailed Description of the Invention
【０００１】[0001]
【発明の属する技術分野】本発明は、材料分離抑制型セ
メント系固化材に関する。より詳しくは、特定比表面積
を有するベースセメントに、特定ブレーン比表面積を有
し且つ非水硬性の無機質微粉末を所定の割合で含むこと
を特徴とする、スラリー化時の材料分離が抑制されたセ
メント系固化材に関するものである。TECHNICAL FIELD The present invention relates to a material-separation-inhibiting cementitious solidifying material. More specifically, the base cement having a specific surface area is characterized by containing a non-hydraulic inorganic fine powder having a specific brane specific surface area in a predetermined ratio, and the material separation during slurry formation was suppressed. The present invention relates to a cement-based solidifying material.
【０００２】[0002]
【従来の技術】深層混合処理工法の中でも、ＣＤＭ工法
や高圧噴射攪拌工法等のセメント系固化材スラリーを使
用する工法においては、スラリーの水比が大きいために
スラリー中の固化材と水の分離(ブリージング)が起こ
り、また、粗粒子が分離沈降してスラリーミキサの低部
に滞留し、そのまま固化してしまう等の問題がある。従
来、スラリーのブリージングを抑制する方法としては、
スラリーの水比を下げてスラリー中の粉体量を多くする
方法が良く行なわれている。その他にも、増粘剤を添加
する方法（例えば、特開平５−１３９８０６）、微粉化
した水硬性材料を使用する方法（例えば、特開平５−２
０８８５３）、特定粒度のセメント微粉末を添加する方
法（特開平７−１５７３４５）等が提案されている。2. Description of the Related Art Among the deep-layer mixing treatment methods, in the method using cement-based solidifying material slurry such as CDM method and high-pressure injection stirring method, the solidifying material and water in the slurry are separated due to the large water ratio of the slurry. (Breathing) occurs, and coarse particles are separated and settled, staying in the lower portion of the slurry mixer, and solidify as they are. Conventionally, as a method of suppressing the breathing of the slurry,
A method of decreasing the water ratio of the slurry to increase the amount of powder in the slurry is often used. In addition, a method of adding a thickener (for example, JP-A-5-139806) and a method of using a finely divided hydraulic material (for example, JP-A-5-252).
08853), a method of adding cement fine powder having a specific particle size (JP-A-7-157345), and the like have been proposed.
【０００３】これ等の方法ではブリージングは確かに抑
制されるが、その抑制作用の本質からスラリーの流動性
が低下し、施工機におけるスラリー輸送効率、噴射効率
が悪化するだけでなく、場合によっては、スラリーを用
いて作製した硬化体の強度も低下するという新たな問題
を伴っていた。Although breathing is surely suppressed by these methods, the fluidity of the slurry is lowered due to the nature of the suppressing effect and not only the slurry transport efficiency and the injection efficiency in the construction machine are deteriorated, but also in some cases. However, there has been a new problem that the strength of the cured product produced using the slurry is also reduced.
【０００４】[0004]
【発明が解決しようとする課題】本発明では、単にブリ
ージングや粗粒子の分離が抑制されているだけではな
く、スラリー流動性、強度発現性にも優れたセメント系
固化材を提供することを目的とする。DISCLOSURE OF THE INVENTION It is an object of the present invention to provide a cement-based solidifying material which not only suppresses breathing and separation of coarse particles but also excels in slurry fluidity and strength development. And
【０００５】[0005]
【課題を解決するための手段】本発明では、ブレーン比
表面積値が２，０００〜５，０００cm2/ｇの範囲にある
ベースセメント１００重量部と、ブレーン比表面積値が
１２，０００〜３３，０００cm2/ｇの範囲にあり、且つ
非水硬性の無機質微粉末３〜２０重量部とを含む材料分
離抑制型セメント系固化材を開発し、上記課題を解決し
た。以下に本発明の内容を詳しく説明する。According to the present invention, 100 parts by weight of base cement having a Blaine specific surface area value of 2,000 to 5,000 cm 2 / g and a Blaine specific surface area value of 12,000 to 33, The above-mentioned problems have been solved by developing a material-separation-inhibiting cementitious solidifying material containing 3 to 20 parts by weight of non-hydraulic inorganic fine powder in the range of 000 cm 2 / g. The contents of the present invention will be described in detail below.
【０００６】本発明において用いるベースセメントとし
ては、ＪＩＳ規格に則った公知の各種ポルトランドセメ
ント、およびポルトランドセメントに高炉スラグ、フラ
イアッシュ、シリカフューム、石膏等の混和材を１種以
上混合して製造される混合セメントを挙げることが出来
る。As the base cement used in the present invention, various known Portland cements according to JIS standards, and one or more kinds of admixtures such as blast furnace slag, fly ash, silica fume and gypsum are mixed with Portland cement. Mention may be made of mixed cement.
【０００７】ベースセメントのブレーン比表面積値は、
２，０００〜５，０００cm2/ｇの範囲にあることが望ま
しい。ブレーン比表面積値が２，０００cm2/ｇ未満の場
合には、ブリージングが非常に大きくなりその抑制は困
難となり、一方、５，０００cm2/ｇより大きい場合に
は、スラリーの流動性が悪くなるからである。The Blaine specific surface area value of the base cement is
It is preferably in the range of 2,000 to 5,000 cm 2 / g. When the Blaine specific surface area value is less than 2,000 cm 2 / g, the breathing becomes very large and it is difficult to suppress it. On the other hand, when it exceeds 5,000 cm 2 / g, the fluidity of the slurry becomes poor. Because.
【０００８】一方、本発明において、添加する無機質微
粉末はベースセメントより粒子が小さいことが好まし
い。一般に、添加する無機質微粉末の粒子が小さい程、
スラリー化時のブリージング抑制効果は大きくなるが、
本発明においては、ブレーン値で示した比表面積が１
２，０００〜３３，０００cm2/ｇの範囲にある、好まし
くは、ブリージング抑制効果が顕著となる１６，０００
cm2/ｇから、その効果の発現が頭打ちとなり始める２
６，０００cm2/ｇまでの範囲にある無機質微粉末を使用
する。上記範囲より小さなブレーン比表面積値を持つ無
機質粉末では、十分なブリージング抑制効果を得るため
にはかなりの添加量を要し、結果としてスラリーの流動
性を悪化させてしまう。逆に、この範囲より大きなブレ
ーン比表面積値を持つ無機質粉末では無機質微粉末の凝
集が起こり、通常の深層混合処理工法で用いられるスラ
リーミキサでは十分に分散させることが困難であり、そ
れを解決するためには分散剤の添加が必要となり、コス
ト高になるだけでなく使用現場での作業工程が一つ増え
ることになり、好ましくない。On the other hand, in the present invention, it is preferable that the inorganic fine powder to be added has smaller particles than the base cement. Generally, the smaller the particles of the inorganic fine powder to be added,
Although the effect of suppressing breathing at the time of slurry formation becomes large,
In the present invention, the specific surface area represented by the Blaine value is 1
It is in the range of 2,000 to 33,000 cm 2 / g, preferably 16,000 at which the breathing suppressing effect becomes remarkable.
From cm 2 / g, the onset of the effect begins to plateau 2
Use an inorganic fine powder in the range of up to 6,000 cm 2 / g. With an inorganic powder having a Blaine specific surface area value smaller than the above range, a considerable amount of addition is required to obtain a sufficient breathing suppressing effect, and as a result, the fluidity of the slurry is deteriorated. On the contrary, in the inorganic powder having a Blaine specific surface area value larger than this range, aggregation of the inorganic fine powder occurs, and it is difficult to sufficiently disperse it with the slurry mixer used in the usual deep layer mixing processing method, which is solved. Therefore, it is necessary to add a dispersant, which not only increases the cost but also increases the number of work steps at the site of use, which is not preferable.
【０００９】無機質微粉末の化学的特性は、スラリー流
動性を左右する要因である。ブリージングおよび粗粒子
の分離を抑制する作用機構から、無機質微粉末は水に難
溶性であることが必要であるが、セメントやシリカフュ
ームのように表面が高い水和活性を有する固体では、そ
の添加によりスラリーの粘度が増加し、スラリー流動性
が低下する。従って本発明においては、無機質微粉末と
して表面水和活性の低い物質すなわち、非水硬性の物質
を用いることが特に重要である。The chemical characteristics of the inorganic fine powder are a factor that determines the fluidity of the slurry. From the mechanism of action that suppresses breathing and separation of coarse particles, it is necessary that the inorganic fine powder is sparingly soluble in water, but for solids with high hydration activity, such as cement and silica fume, the addition of it The viscosity of the slurry increases and the fluidity of the slurry decreases. Therefore, in the present invention, it is particularly important to use a substance having a low surface hydration activity as the inorganic fine powder, that is, a non-hydraulic substance.
【００１０】また、比重が大き過ぎる粒子では、スラリ
ー中で粒子に働く浮力の効果が相対的に小さくなり、ベ
ースセメント粗粒子の分離沈降を十分に抑制できないだ
けでなく、無機質微粉末自体が分離沈降する恐れがあ
る。一方、比重が小さ過ぎる場合には、浮力の効果が大
き過ぎるため、無機質微粉末粒子は上方に集まり結果と
して均一な分散がやはり阻害される。本発明では、粒子
比重が１．５〜３．０である無機質微粉末を用いること
により、好ましい結果を得ることが出来る。Further, if the specific gravity is too large, the effect of buoyancy acting on the particles in the slurry becomes relatively small, and not only the separation and sedimentation of the base cement coarse particles cannot be sufficiently suppressed, but also the inorganic fine powder itself separates. May settle. On the other hand, when the specific gravity is too small, the effect of the buoyancy is too large, and the inorganic fine powder particles gather upward, and as a result, uniform dispersion is also hindered. In the present invention, preferable results can be obtained by using an inorganic fine powder having a particle specific gravity of 1.5 to 3.0.
【００１１】本発明において無機質微粉末としては、前
記ブレーン比表面積を有する非水硬性のものであれば何
れをも使用できるが、好適な例として消石灰、炭酸カル
シウムおよび珪石粉を挙げることができる。これ等の物
質は、比較的容易にブレーン比表面積値が１２，０００
ｍ2/ｇ以上の粉体に粉砕することが可能であり、且つ水
和活性も極めて低い。更に、比重も２．１〜２．７と小
さい。従って、スラリー中で十分に分散して、効率的に
スラリーのブリージングおよび粗粒子の分離を抑制し、
且つスラリー流動性、硬化体における強度発現性も良好
である。In the present invention, as the inorganic fine powder, any non-hydraulic powder having the above-mentioned Blaine specific surface area can be used, and preferred examples thereof include slaked lime, calcium carbonate and silica stone powder. These materials have a Blaine specific surface area value of 12,000 relatively easily.
It can be pulverized into powder of m 2 / g or more and has extremely low hydration activity. Furthermore, the specific gravity is as small as 2.1 to 2.7. Therefore, it is sufficiently dispersed in the slurry to effectively suppress the breathing of the slurry and the separation of coarse particles,
In addition, the slurry fluidity and the strength development in the cured product are also good.
【００１２】無機質微粉末の含有量は、ベースセメント
１００重量部に対して３〜２０重量部、好ましくは５〜
１０重量部である。この範囲より少ない量では十分なブ
リージングおよび粗粒子分離抑制効果が得られず、逆に
これより多い場合には、スラリーの流動性が低下する
他、硬化体にした際の強度発現性の低下を招く。無機質
微粉末含有量が５〜１０重量部であれば、スラリーの流
動性、硬化体の強度発現性には全く影響を及ぼすことな
く、十分なブリージングおよび粗粒子の分離抑制効果を
得ることが出来る。The content of the fine inorganic powder is 3 to 20 parts by weight, preferably 5 to 100 parts by weight of the base cement.
10 parts by weight. If the amount is less than this range, sufficient breathing and coarse particle separation suppressing effect cannot be obtained. On the contrary, if it is more than this range, the fluidity of the slurry is reduced, and the strength developability of the cured product is reduced. Invite. When the content of the inorganic fine powder is 5 to 10 parts by weight, sufficient effects of breathing and separation of coarse particles can be obtained without affecting the fluidity of the slurry and the strength development of the cured product. .
【００１３】本発明で使用する無機質微粉末粒子は、ス
ラリー中において、ベースであるセメント粒子と主に分
子間引力により物理的に結合し、粒子群がより微細な網
目構造を形成することにより、粒子群全体の沈降、すな
わちブリージングを抑制し、なお且つ粗粒子の分離沈降
をも抑制し、スラリーを均一化させる。The inorganic fine powder particles used in the present invention are physically bonded to the cement particles as a base mainly by intermolecular attractive force in the slurry, and the particle group forms a finer network structure, It suppresses sedimentation of the entire particle group, that is, breathing, and also suppresses separation and sedimentation of coarse particles to homogenize the slurry.
【００１４】[0014]
【実施例】以下に、実施例および比較例を挙げて、本発
明の効果を説明する。
１．分離抑制型セメント系固化材の調製
分離抑制型セメント系固化材は、所定量のベースセメン
トと所定量の無機質微粉末を卓上型混合機で２分間混練
して調製した。断わりがない限り、ベースセメントはブ
レーン比表面積値３，２００cm2/ｇの 普通ポルトラン
ドセメント（以下、ＮＣと略す）を使用し、ベースセメ
ントと 無機質微粉末の重量混合比は１００：５であ
る。EXAMPLES The effects of the present invention will be described below with reference to examples and comparative examples. 1. Preparation of Separation-inhibiting Cement-Based Solidifying Material The separation-inhibiting cement-based solidifying material was prepared by kneading a predetermined amount of base cement and a predetermined amount of inorganic fine powder for 2 minutes with a desktop mixer. Unless otherwise specified, as the base cement, normal Portland cement (hereinafter abbreviated as NC) having a Blaine specific surface area value of 3,200 cm 2 / g is used, and the weight mixing ratio of the base cement and the inorganic fine powder is 100: 5.
【００１５】また、固化材スラリーの特性評価、および
固化材スラリーを用いて作製した硬化体の強度評価は次
のように行なった。
２．ブリージング率
水４００ｇと固化材４００ｇとをジューサーミキサで３
分分間混練して調製した固化材スラリー（水／固化材比
＝１）の５００mlを５００mlメスシリンダーに入れ、１
時間静置した後の固化材の沈降容積を測定した。ブリー
ジング率は次式で求めた。
ブリージング率(％)＝[ブリージング水量(ml)／スラリ
ー容積５００(ml)]×１００The characteristic evaluation of the solidifying material slurry and the strength evaluation of the hardened material prepared using the solidifying material slurry were carried out as follows. 2. Breathing rate 400 g of water and 400 g of solidifying material were mixed with a juicer mixer.
Put 500 ml of solidifying material slurry (water / solidifying material ratio = 1) prepared by kneading for minutes into a 500 ml graduated cylinder, and
The sedimentation volume of the solidified material after standing for a time was measured. The breathing rate was calculated by the following formula. Breathing rate (%) = [breathing water amount (ml) / slurry volume 500 (ml)] x 100
【００１６】３．沈降物の場所による比重差
上記３で沈降容積を測定した後、固化材沈降部分の上部
および下部からスラリーを各２０ml採取してその重量を
測定し、下部と上部の比重差を求めた。3. Specific gravity difference depending on location of sediment After measuring the sedimentation volume in the above 3, 20 ml of each slurry was sampled from the upper part and the lower part of the solidified material sedimentation part, and the weight thereof was measured to obtain the specific gravity difference between the lower part and the upper part.
【００１７】４．見掛け粘度
調製直後の固化材スラリーについて、ＶＧメーター(FAN
N INSTRUMENT CORP.製、ＡＰＩスペック１０に準拠)を
用いて測定した。4. VG meter (FAN
N INSTRUMENT CORP., API specification 10).
【００１８】５．一軸圧縮強さ
含水比１３．０％、湿潤密度２.１８７ｇ/cm3の砂質土
および含水比５６．９ ％、湿潤密度１．６３６ｇ/cm3
の粘性土に、固化材スラリーを４００kg/ｍ3の割合で添
加・混練し、材齢７日後の一軸圧縮強さを「ＪＩＳＡ１
２ １６土の 一軸圧縮試験方法」に準拠して測定し
た。5. Uniaxial compressive strength 13.0% water content, 2.187 g / cm 3 wet density of sandy soil and 56.9% water content, 1.636 g / cm 3 wet density
The solidified material slurry was added and kneaded at a rate of 400 kg / m 3 to the cohesive soil of No. 1, and the uniaxial compressive strength after 7 days of age was measured according to "JIS A1.
216 Soil uniaxial compression test method ".
【００１９】実施例１〜７および比較例１〜４
表１には、無機質微粉末としてブレーン比表面積の互い
に異なる重質炭酸カルシウムを使用した場合の結果、お
よび無機質微粉末を添加しなかった場合の結果(比較例
４）を示す。Examples 1 to 7 and Comparative Examples 1 to 4 Table 1 shows the results when heavy calcium carbonates having different Blaine specific surface areas were used as the inorganic fine powder, and the case where the inorganic fine powder was not added. The results (Comparative Example 4) are shown.
【００２０】ブレーン比表面積値の最も小さい比較例３
の場合を除いて、ブリージング率、比重差共に無機質微
粉末無添加の場合より小さな値になっており、無機質微
粉末の添加により、ブリージングおよび粗粒子の分離が
抑制され、スラリーの均一性が改善されることを示して
いる。この効果は、ブレーン比表面積値と共に大きくな
り、１２，０００cm2/ｇにおいて無機質微粉末無添加の
場合との差が明確になる。１６，０００cm2/ｇ以上にな
ると効果は更に顕著となるが、２６，０００cm2/ｇ以上
では徐々に頭打ちとなる。Comparative Example 3 having the smallest Blaine specific surface area
Except in the case of, both the breathing rate and the difference in specific gravity are smaller than those without the addition of the inorganic fine powder, and the addition of the inorganic fine powder suppresses the breathing and the separation of coarse particles, improving the uniformity of the slurry. Is shown to be done. This effect increases with the Blaine specific surface area value, and at 12,000 cm 2 / g, the difference from the case where no inorganic fine powder is added becomes clear. At 16,000 cm 2 / g or more, the effect becomes more remarkable, but at 26,000 cm 2 / g or more, it gradually reaches the ceiling.
【００２１】[0021]
【表１】 [Table 1]
【００２２】実施例８〜１０および比較例５，６
表２には、比重の異なる無機質微粉末を使用した場合の
結果を示す。比重が３．０以下である重質炭酸カルシウ
ム、消石灰および珪石粉を用いた実施例８〜１０では、
ブリージング率および沈降部分の上部・下部間の比重差
が共に小さく、スラリーの均一性は高い。一方、比重が
３．０より非常に大である酸化亜鉛では、ブリージング
は抑制されるものの、沈降部分の上部・下部間の比重差
が大きく、粗粒子分離抑制効果が十分でない。Examples 8 to 10 and Comparative Examples 5 and 6 Table 2 shows the results when inorganic fine powders having different specific gravities were used. In Examples 8 to 10 using heavy calcium carbonate having a specific gravity of 3.0 or less, slaked lime and silica powder,
Both the breathing rate and the difference in specific gravity between the upper and lower parts of the sedimentation part are small, and the uniformity of the slurry is high. On the other hand, with zinc oxide having a specific gravity much higher than 3.0, although breathing is suppressed, the difference in specific gravity between the upper part and the lower part of the sedimentation part is large, and the effect of suppressing coarse particle separation is not sufficient.
【００２３】[0023]
【表２】 [Table 2]
【００２４】また、水和活性の高いセメントのような無
機質微粉末は、ブリージング率および沈降部分の上部・
下部間の比重差共に小さい、すなわち、均一性の高いス
ラリーを与えるが、スラリーの見掛け粘度が増加し、ス
ラリー流動性が低下する。これに対し、水和活性の低
い、重質炭酸カルシウム、消石灰および珪石粉では、ス
ラリー流動性への影響はほとんど認められない。In addition, an inorganic fine powder having a high hydration activity, such as cement, has a breathing rate and an upper portion of the sedimentation portion.
Although the difference in specific gravity between the lower parts is small, that is, a slurry having high uniformity is provided, but the apparent viscosity of the slurry increases and the fluidity of the slurry decreases. On the other hand, in the case of heavy calcium carbonate, slaked lime and silica stone powder, which have low hydration activity, almost no influence on the slurry fluidity is observed.
【００２５】実施例１０〜１５および比較例４，７，８
表３には、無機質微粉末として実施例４で用いたブレー
ン比表面積値が１８，０００cm2/ｇの重質炭酸カルシウ
ムを使用し、ベースセメントとの混合割合を変えた場合
の結果を示す。重質炭酸カルシウムの含有量の増加に伴
い、ブリージングおよび粗粒子の分離に対する抑制効果
は高くなるが、スラリー粘度は徐々に高くなり、硬化体
の強度発現性は徐々に低下する。流動性、強度発現性に
大きな影響がなく、十分な分離抑制効果が発現する無機
質微粉末の含有量は３〜２０重量部であり、特に、５〜
１０重量部の含有量におけるブリージングおよび粗粒子
の分離抑制効果は大きく、且つスラリー流動性、硬化体
の強度発現性も良好である。Examples 10 to 15 and Comparative Examples 4, 7 and 8 In Table 3, the ground calcium carbonate having the Blaine specific surface area value of 18,000 cm 2 / g used in Example 4 was used as the inorganic fine powder. The results when the mixing ratio with the base cement is changed are shown. As the content of heavy calcium carbonate increases, the suppressing effect on breathing and separation of coarse particles increases, but the slurry viscosity gradually increases, and the strength development of the cured product gradually decreases. The content of the inorganic fine powder that exerts a sufficient separation suppressing effect without significantly affecting the fluidity and strength development is 3 to 20 parts by weight, and particularly 5 to
When the content is 10 parts by weight, the effect of suppressing breathing and the separation of coarse particles is large, and the slurry fluidity and the strength development of the cured product are good.
【００２６】[0026]
【表３】 [Table 3]
【００２７】実施例１６〜１８および比較例９〜１１
表４には、無機質微粉末を実施例４で用いたブレーン比
表面積値が１８，０００cm2/ｇの炭酸カルシウムに固定
し、ベースセメントの種類を変えた場合の結果を示す。
ベースセメントのブレーン比表面積値が２，０００〜
５，０００cm2/ｇの範囲内であれば、低水和活性すなわ
ち非水硬性の無機質微粉末を混合することで、スラリー
化時のブリージングが十分に抑制され、且つ流動性も良
好である。一方、ブレーン比表面積値が２，０００cm2/
ｇ未満のベースセメント（比較例９）では、非水硬性の
無機質微粉末を混合してもブリージング率は非常に高い
ままであり、５，０００cm2/ｇより大きい場合（比較例
１０，１１）には、スラリー流動性が本質的に低く、実
用上問題がある。Examples 16 to 18 and Comparative Examples 9 to 11 Table 4 shows that the inorganic fine powder was fixed to the calcium carbonate having the Blaine specific surface area value of 18,000 cm 2 / g used in Example 4 to prepare a base cement. The results when the type is changed are shown.
Blaine specific surface area of base cement is 2,000-
When it is in the range of 5,000 cm 2 / g, breathing during slurry formation is sufficiently suppressed and the fluidity is good by mixing the inorganic fine powder having low hydration activity, that is, non-hydraulicity. On the other hand, the Blaine specific surface area value is 2,000 cm 2 /
With the base cement of less than g (Comparative Example 9), the breathing rate remains very high even when non-hydraulic inorganic fine powder is mixed, and when it is greater than 5,000 cm 2 / g (Comparative Examples 10 and 11). Has inherently low slurry fluidity, which is a practical problem.
【００２８】[0028]
【表４】 [Table 4]
【００２９】[0029]
【発明の効果】本発明によれば、従来のベースセメント
に非水硬性の無機質微粉末を添加すると云う簡便且つ安
価な方法で、スラリー流動性、硬化体の強度発現性を損
なうことなく、効率的にスラリー化時のブリージングお
よび粗粒子の分離が抑制された固化材を得ることが出来
る。従って、ＣＤＭ工法や高圧噴射攪拌工法等のセメン
ト系固化材スラリーを使用する工法において、この固化
材の利用価値は大である。According to the present invention, a simple and inexpensive method of adding a non-hydraulic inorganic fine powder to a conventional base cement can be used without sacrificing the slurry fluidity and the strength development of the hardened product, and improving the efficiency. It is possible to obtain a solidified material in which breathing and separation of coarse particles during slurry formation are suppressed. Therefore, the utility value of the solidifying material is great in the construction method using the cement-based solidifying material slurry such as the CDM method and the high-pressure injection stirring method.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０９Ｋ 17/06 Ｃ０９Ｋ 17/06 Ｐ 17/10 17/10 Ｐ // Ｃ０９Ｋ 103:00 103:00 (56)参考文献 特開 平８−34645（ＪＰ，Ａ) 特開 平２−311346（ＪＰ，Ａ) 特開 平５−208853（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 28/02 C04B 14/06 C04B 14/28 C04B 14/36 C04B 20/00 C09K 17/06 C09K 17/10 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI C09K 17/06 C09K 17/06 P 17/10 17/10 P // C09K 103: 00 103: 00 (56) References Japanese Unexamined Patent Publication No. 8-34645 (JP, A) Japanese Unexamined Patent Publication No. 2-311346 (JP, A) Japanese Unexamined Patent Publication No. 5-208853 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) C04B 28 / 02 C04B 14/06 C04B 14/28 C04B 14/36 C04B 20/00 C09K 17/06 C09K 17/10
Claims (3)
０ｃｍ２／ｇの範囲にあるベースセメント１００重量部
と、ブレーン比表面積が１２，０００〜３３，０００ｃ
ｍ２／ｇの範囲にあり、且つ非水硬性の無機質微粉末３
〜２０重量部とを含む事を特徴とする、ＣＤＭ工法また
は高圧噴射攪拌工法用の材料分離抑制型固化材。1. A Blaine specific surface area of 2,000 to 5,000.
100 parts by weight of base cement in the range of 0 cm 2 / g and a Blaine specific surface area of 12,000 to 33,000 c
Non-hydraulic inorganic fine powder in the range of m 2 / g 3
~ 20 parts by weight , and the CDM method or
Is a solidification material that suppresses material separation for the high-pressure injection stirring method .
であることを特徴とする請求項１に記載のＣＤＭ工法ま
たは高圧噴射攪拌工法用の材料分離抑制型固化材。2. The particle specific gravity of the inorganic fine powder is 1.5 to 3.0.
The CDM method according to claim 1, characterized in that
Or a solidification material that suppresses material separation for high-pressure injection stirring method .
及び珪石粉から選ばれた１種以上であることを特徴とす
る請求項１または請求項２に記載のＣＤＭ工法または高
圧噴射攪拌工法用の材料分離抑制型固化材。3. The CDM method according to claim 1 or 2, wherein the inorganic fine powder is one or more selected from slaked lime, calcium carbonate and silica stone powder.
Material separation suppression type solidifying material for pressure injection stirring method .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7025796A JP3438463B2 (en) | 1996-03-26 | 1996-03-26 | Cement-based solidification material that suppresses material separation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7025796A JP3438463B2 (en) | 1996-03-26 | 1996-03-26 | Cement-based solidification material that suppresses material separation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09255392A JPH09255392A (en) | 1997-09-30 |
| JP3438463B2 true JP3438463B2 (en) | 2003-08-18 |
Family
ID=13426325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7025796A Expired - Lifetime JP3438463B2 (en) | 1996-03-26 | 1996-03-26 | Cement-based solidification material that suppresses material separation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3438463B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2813881B1 (en) * | 2000-09-13 | 2003-04-25 | Cie Du Sol | A METHOD FOR LIMITING THE RELEASE OF ORGANIC MATERIALS INTO THE ENVIRONMENT DURING THE FOUNDATION, AND CONCRETE LIKELY TO BE USED IN SAID METHOD |
| CN108911566B (en) * | 2018-07-05 | 2020-10-30 | 中建西部建设湖南有限公司 | Easy-to-disperse segregation concrete adjusting modifier capable of being used in construction site |
-
1996
- 1996-03-26 JP JP7025796A patent/JP3438463B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09255392A (en) | 1997-09-30 |
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