JPH02206756A - Method and device for measuring quantity of cement in cement mixture - Google Patents

Method and device for measuring quantity of cement in cement mixture

Info

Publication number
JPH02206756A
JPH02206756A JP2797989A JP2797989A JPH02206756A JP H02206756 A JPH02206756 A JP H02206756A JP 2797989 A JP2797989 A JP 2797989A JP 2797989 A JP2797989 A JP 2797989A JP H02206756 A JPH02206756 A JP H02206756A
Authority
JP
Japan
Prior art keywords
cement
mixture
magnetic permeability
measuring
solenoid
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.)
Granted
Application number
JP2797989A
Other languages
Japanese (ja)
Other versions
JPH07119744B2 (en
Inventor
Chiharu Ishisaki
石先 千春
Takanori Tsutaoka
蔦岡 孝則
Shunichi Ema
江間 俊一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP2797989A priority Critical patent/JPH07119744B2/en
Publication of JPH02206756A publication Critical patent/JPH02206756A/en
Publication of JPH07119744B2 publication Critical patent/JPH07119744B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)

Abstract

PURPOSE:To quickly measure the concentration by measuring magnetic permeability of cement milk containing a ferromagnetic material in a prescribed ratio, measuring magnetic permeability of a cement mixture for using the same cement milk as a cement raw material, and deriving a ratio of the magnetic permeability. CONSTITUTION:A mixture of cement and water (it is called cement milk) in which a ferromagnetic material is mixed by a prescribed quantity is allowed to flow into a pipe 101, and in this case, impedance of a solenoid 103 is mea sured. Also, with the cement milk which flows out, water and cement, a cement mixture is manufactured, and by allowing this cement mixture to flow into a pipe 102, impedance of a solenoid 104 is measured. By measuring the induct ance quantity, magnetic permeability is calculated, and concentration of cement is measured. By using the pipes 101, 102, a measuring error can be obviated in a real time, and also, since the concentration can be measured in a real time, a job site can be managed smoothly.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、セメント混合物中のセメント量を瞬時に、し
かも連続的かつ精度よく測定する方法に′ 関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for instantly, continuously and accurately measuring the amount of cement in a cement mixture.

(従来の技術) セメント混合物は、建築、土木等さまざまな分野で利用
されており、強度確認等のために混合物中のセメント量
を測定する必要が生じる。従来、セメント混合物中のセ
メント量を測定する方法として、セメント混合物を絶乾
状態にして水分量を測定した後、粉砕して塩酸に溶解さ
せ、酸化カルシウム、及びシリカ、ないしは不溶残分を
化学分析により定量し、その値からセメント量を推定す
る方法が取られてきた。
(Prior Art) Cement mixtures are used in various fields such as architecture and civil engineering, and it is necessary to measure the amount of cement in the mixture in order to confirm strength and the like. Conventionally, the method of measuring the amount of cement in a cement mixture is to measure the moisture content by keeping the cement mixture in an absolutely dry state, then crushing it, dissolving it in hydrochloric acid, and chemically analyzing the calcium oxide, silica, or insoluble residue. A method has been adopted in which the amount of cement is estimated from this value.

しかし、この方法では、試験に長時間を要する他、化学
分析室に試料を持ち込む必要があり現場施工時の施工管
理には適していない。また、骨材ないし土中に塩酸によ
り溶解する成分を含む場合は精度の面でも問題がある。
However, this method requires a long time for testing and also requires bringing the sample to a chemical analysis laboratory, making it unsuitable for construction management during on-site construction. Furthermore, if the aggregate or soil contains components that can be dissolved by hydrochloric acid, there is also a problem in terms of accuracy.

そこで本発明者らは、セメント中にあらかじめ強磁性体
混合しておき、得られたセメント混合物の透磁率を測定
し、これにもとづいてセメント量を検出する技術を開発
した。
Therefore, the present inventors have developed a technique in which a ferromagnetic material is mixed in cement in advance, the magnetic permeability of the obtained cement mixture is measured, and the amount of cement is detected based on this.

しかしながら、セメント混合物のみの透磁率を測定する
方法では、使用する強磁性体により検量線を別々に作製
しなければならず、またソレノイドを1つ使用して測定
する場合中空のインダクタンスをその都度評価できない
ため、温度や使用条件の変化により中空のインダクタン
スも変化し誤差を生じるという問題がある。
However, in the method of measuring the magnetic permeability of only cement mixtures, calibration curves must be prepared separately depending on the ferromagnetic material used, and when measuring using a single solenoid, the inductance of the hollow space must be evaluated each time. Therefore, there is a problem in that the inductance of the hollow space changes due to changes in temperature and usage conditions, resulting in errors.

(発明が解決しようとする問題点) 本発明が解決しようとする問題は、これらの問題点を除
去し、セメント混合物中のセメント量の測定により施工
管理を容易にするため、短時間で簡便にセメント量を測
定できるようにし、かつ測定精度を上げることにある。
(Problems to be Solved by the Invention) The problems to be solved by the present invention are to eliminate these problems and to facilitate construction management by measuring the amount of cement in a cement mixture. The objective is to be able to measure the amount of cement and to improve measurement accuracy.

(問題を解決するための手段) (1)本発明のセメント混合物中のセメント量の測定方
法は、セメントに所定の比率で強磁性体を混合したセメ
ント混合物の透磁率を測定し、これにもとづいてセメン
ト混合物中のセメント量を測定する方法において、強磁
性体を所定の比率で含むセメントミルクの透磁率を測定
し、前記セメントミルクと同じ比率の強磁性体を含むセ
メントミルクをセメント原料として使用したセメント混
合物の透磁率を測定して、前記セメントミルクとの透磁
率の比を求めることによりセメント量を測定する事を特
徴としている。
(Means for solving the problem) (1) The method of measuring the amount of cement in a cement mixture of the present invention measures the magnetic permeability of a cement mixture in which a ferromagnetic material is mixed with cement at a predetermined ratio, and based on this, In the method of measuring the amount of cement in a cement mixture, the magnetic permeability of cement milk containing a predetermined ratio of ferromagnetic material is measured, and the cement milk containing the same ratio of ferromagnetic material as the cement milk is used as a cement raw material. The method is characterized in that the amount of cement is measured by measuring the magnetic permeability of the cement mixture and determining the ratio of the magnetic permeability to the cement milk.

(2)本発明のセメント混合物中のセメント量の測定装
置は、少なくとも2つ以上の、巻き数と形状が同じソレ
ノイド、及び該ソレノイドのインダクタンスを測定する
装置、及び該ソレノイド内に一定体積でセメントミルク
及びセメント混合物を収容する容器もしメはセメントミ
ルク及びセメント混合物を該ソレノイド内で流動させる
容器とを備えてなることを特徴としている。
(2) The device for measuring the amount of cement in a cement mixture of the present invention includes at least two solenoids having the same number of turns and the same shape, a device for measuring the inductance of the solenoid, and a constant volume of cement in the solenoid. The container for containing the milk and cement mixture is characterized in that it comprises a container for causing the cement milk and cement mixture to flow within the solenoid.

(作用) (1)強磁性粒子を非磁性体中に一様に分散させた混合
物の透磁率は、混合物中の強磁性体濃度に比例して変化
する。それゆえ、混合物中の強磁性体濃度をA、透磁率
をpとすれば次式が成立する。
(Function) (1) The magnetic permeability of a mixture in which ferromagnetic particles are uniformly dispersed in a non-magnetic material changes in proportion to the ferromagnetic material concentration in the mixture. Therefore, if the concentration of ferromagnetic material in the mixture is A and the magnetic permeability is p, the following equation holds true.

p=aA+p□    (1,1) ここでpoは真空中の透磁率、aは強磁性体固有の定。p=aA+p□ (1, 1) Here, po is the magnetic permeability in vacuum, and a is the constant specific to ferromagnetic materials.

数である。いま、強磁性体を一定量配合したセメントと
水の混合物(以下これをセメントミルクと称す)の強磁
性体濃度をA1、セメント濃度をB1、透磁率をPlと
し、このセメントミルクが他の非磁性物で希釈され(以
下これをセメント混合物と称す)だときの強磁性体濃度
をA2、セメント濃度をB2、透磁率をμ2とする。こ
のとき(1,1)式よりpt=aAt+po’  (1
−2) p2=aA2+p□ 、  (1,3)である。また希
釈過程で強磁性粒子とセメント粒子が同一挙動を示せば
、 Bl/Al−B2/A2  (1,4)が成立する。い
ま有効透磁率11effl、1leff2を次式1式%
(15) で定義すれば、この比1leffl乍eff2は(1,
4)〜(1,6)式より X1effl/1”eff2=Al/A2°Bx/B2
(px−po)/(p2−po) (1,7)で示され
る。l’O,AlおよびB1は既知量あり、透磁率ll
l+μ2をそれぞれ測定すれば、未知量であるA2゜B
2をそれぞれ算出することが出来、前もって別に検量線
を測定により求めておく必要はない。
It is a number. Now, suppose that the ferromagnetic concentration of a mixture of cement and water containing a certain amount of ferromagnetic material (hereinafter referred to as cement milk) is A1, the cement concentration is B1, and the magnetic permeability is Pl. When diluted with a magnetic substance (hereinafter referred to as a cement mixture), the ferromagnetic substance concentration is A2, the cement concentration is B2, and the magnetic permeability is μ2. At this time, from equation (1, 1), pt=aAt+po' (1
-2) p2=aA2+p□, (1,3). Furthermore, if the ferromagnetic particles and cement particles exhibit the same behavior during the dilution process, Bl/Al-B2/A2 (1, 4) holds true. Now, the effective magnetic permeability 11effl, 1leff2 is expressed as the following formula 1 formula %
(15), this ratio 1reffl to eff2 is (1,
4) From formulas (1, 6), X1effl/1”eff2=Al/A2°Bx/B2
(px-po)/(p2-po) (1,7). l'O, Al and B1 have known quantities, magnetic permeability ll
If l+μ2 are measured, the unknown quantity A2゜B
2 can be calculated respectively, and there is no need to separately obtain a calibration curve by measurement in advance.

(2)インピーダンスz□の中空ソレノイド中に磁性体
をいれると、ソレノイドのインピーダンスは磁性体の透
磁率により変化する。いま中空ソレノイドのインピーダ
ンスをzo1インダクタンスLo、抵抗をRO,純虚数
を11周波数をωとしてZ□=R□+jωL□    
             (2,1)で与えられる。
(2) When a magnetic material is placed in a hollow solenoid with impedance z□, the impedance of the solenoid changes depending on the magnetic permeability of the magnetic material. Now, the impedance of the hollow solenoid is zo1, inductance Lo, resistance is RO, pure imaginary number is 11, frequency is ω, and Z□=R□+jωL□
It is given by (2,1).

このソレノイド中に透磁率pの磁性体をいれればソレノ
イドのインピーダンスz1はZl = 式+ ωL□(
81/S□)111” +jωLo((So−81)+
 l11’s1)/S。
If a magnetic material with magnetic permeability p is inserted into this solenoid, the impedance z1 of the solenoid will be Zl = Formula + ωL□(
81/S□)111” +jωLo((So-81)+
l11's1)/S.

(2,2) で与えられる。ここで、Soはソレノイドの断面積、S
lは磁性体の断面積であり、プは透磁率pの実数部、μ
″′は虚数部を示し次式が成立する。
It is given by (2,2). Here, So is the cross-sectional area of the solenoid, S
l is the cross-sectional area of the magnetic material, p is the real part of the magnetic permeability p, μ
″′ represents the imaginary part, and the following equation holds true.

p:μ′−j戸”              (2,
3)さらに磁性体を入れたときのソレノイドのインピー
ダンスz1は、インダクタンスをLl、抵抗をR1とし
て、 Zl =R1+jωL1            (2
,4)であり、ゆえに、 R1= RO+ ωL□(81/8o)11”    
     (2,5)Ll = Lo((So −81
) +1”81)/So         (2,6)
となり、透磁率の実数部、虚数部はそれぞれp’ = 
(SQ/5IXLl/LQ−1) + 1      
  (2,7)11”=(So/5IXR1−Rol)
/ωLO(2,8)となる。これより、中空、及び磁性
体を入れたときのソレノイドのインダクタンス、及び抵
抗を測定すれば、ソレノイドに入れた磁性体の透磁率が
求められる。このとき、強磁性体として高周波まC磁気
損失の無いものを用いれば、測定周波数では1.IIが
Oで、プのみとなり p = (S□/5IXL1/L□−1)+ 1   
      (2,9)となる。また測定に用いる複数
のソレノイドの巻き数と形状が同じであればLo、So
、Sl、RO2R1は同じと考えられ、これらの値は既
知量であるからインダクタンス量のみ測定すれば透磁率
を(2,9)式により算出できる。
p: μ′−j door” (2,
3) The impedance z1 of the solenoid when a magnetic material is further inserted is as follows, where the inductance is Ll and the resistance is R1, Zl = R1 + jωL1 (2
, 4), therefore, R1=RO+ωL□(81/8o)11”
(2,5) Ll = Lo((So −81
) +1”81)/So (2,6)
The real and imaginary parts of magnetic permeability are p' =
(SQ/5IXLl/LQ-1) + 1
(2,7)11”=(So/5IXR1-Rol)
/ωLO(2,8). From this, by measuring the inductance and resistance of the solenoid when it is hollow and when a magnetic material is inserted, the magnetic permeability of the magnetic material inserted into the solenoid can be determined. At this time, if a ferromagnetic material with no high frequency or C magnetic loss is used, the measurement frequency is 1. When II is O, there is only p, and p = (S□/5IXL1/L□-1)+1
(2,9). Also, if the number of turns and shape of multiple solenoids used for measurement are the same, Lo and So
, Sl, and RO2R1 are considered to be the same, and since these values are known quantities, magnetic permeability can be calculated by equation (2, 9) by measuring only the inductance amount.

(実施例) 以下、本発明の実施例を図を用いながら詳細に説明する
(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

第1図は本発明のセメント量測定装置の一例図であり、
2つのソレノイド、データセレクタ、インピーダンスア
ナライザ、コンピュータおよびプリンタで構成されてい
る。また第2図は本発明によらないセメント量測定装置
の一例図であり1つのソレノイド、データセレクタ、イ
ンピーダンスアナライザ、コンピュータおよびプリンタ
で構成されている。第1図、第2図中で101と102
はパイプ、103と104はソレノイド、105はセン
サボックス、111はデータセレクタ、121はインピ
ーダンスアナライザ、131はコンピュータ、141は
プリンタを示す。
FIG. 1 is an example diagram of the cement amount measuring device of the present invention,
It consists of two solenoids, a data selector, an impedance analyzer, a computer and a printer. Further, FIG. 2 is a diagram showing an example of a cement amount measuring device not according to the present invention, which is composed of one solenoid, a data selector, an impedance analyzer, a computer, and a printer. 101 and 102 in Figures 1 and 2
1 is a pipe, 103 and 104 are solenoids, 105 is a sensor box, 111 is a data selector, 121 is an impedance analyzer, 131 is a computer, and 141 is a printer.

尚ソレノイドi03およびソレノイド104の中空のイ
ンピーダンスは供に等しく 、 1.975刈0−’(
H)であった。
The hollow impedances of solenoid i03 and solenoid 104 are both equal, and 1.975 moi 0-'(
H).

(実施例1) 第1図のパイプ101に、セメント濃度300(kg/
m3)に調整したセメントミルクを流入しこのときのソ
レノイド103のインピーダンスを測定した。また流出
したセメントミルクを水でセメント濃度100〜300
(kg/m3)に希釈してセメント混合物を作製し、こ
のセメント混合物をパイプ102に流入してソレノイド
104のインピーダンスを測定した。このときのセメン
ト混合物中の実際のセメント濃度C(kg/m3)、ソ
レノイド103のインピーダンスLl(H)、ソレノイ
ド104のインピーダンスL2(H)、セメントミルク
の透磁率p1と有効透磁率11eff1、セメント混合
物の透磁率112と有効透磁率μeff2、測定より求
めたセメント混合物中のセメント濃度Ccal(kg/
m3)および誤差Er(%)を第−表に示す。
(Example 1) A cement concentration of 300 (kg/kg) was added to the pipe 101 in FIG.
The impedance of the solenoid 103 at this time was measured. Also, mix the spilled cement milk with water to give a cement concentration of 100 to 300.
(kg/m3) to prepare a cement mixture, this cement mixture was flowed into the pipe 102, and the impedance of the solenoid 104 was measured. Actual cement concentration C (kg/m3) in the cement mixture at this time, impedance Ll (H) of solenoid 103, impedance L2 (H) of solenoid 104, magnetic permeability p1 and effective magnetic permeability 11eff1 of cement milk, cement mixture The magnetic permeability 112 and the effective magnetic permeability μeff2, the cement concentration Ccal (kg/kg/
m3) and error Er (%) are shown in Table 1.

(比較例1) 第2図のパイプ102に、セメント濃度300(kg/
m3)にに調整したセメントミルクを流入しこのときの
ソレノイド104のインピーダンスを測定した。次にこ
のセメントミルクを水でセメント濃度100〜300(
kg/m”)に希釈してセメント混合物を作製し、この
セメント混合物をパイプ102に流入してソレノイド1
04のインピーダンスを測定した。このときのセメント
混合物中の実際のセメント濃度C(kg/m3)、ソレ
ノイド104のインピーダンスL2(H)、セメント混
合物の透磁率p2と有効透磁率11eff2、測定より
求めたセメント混合物中のセメント(発明の効果) 実施例では、第−表から判るように、同じセメントミル
クを流入してもLlの値は変化している。
(Comparative Example 1) A cement concentration of 300 (kg/kg) was added to the pipe 102 in FIG.
Cement milk adjusted to m3) was flowed into the tank, and the impedance of the solenoid 104 at this time was measured. Next, add this cement milk to water to give a cement concentration of 100 to 300 (
kg/m”) to prepare a cement mixture, and this cement mixture flows into the pipe 102 and the solenoid 1
The impedance of 04 was measured. At this time, the actual cement concentration C (kg/m3) in the cement mixture, the impedance L2 (H) of the solenoid 104, the magnetic permeability p2 and effective magnetic permeability 11eff2 of the cement mixture, the cement in the cement mixture determined by measurement (invention (Effect) In the example, as can be seen from Table 1, the value of Ll changes even if the same cement milk is injected.

(即ちμm、l’effも変化している)これは測定時
の温度変化やセメントミルク中の強磁性体の不均一性等
が原因と考えられる。しかしセメント混合物を流入して
L2を測定しているときも同様の温度変化や強磁性体の
不均一性等が生じるため、これらの変化を相殺すること
が可能となり、従って測定誤差も6.0%以下になって
いる。比較例では一本のソレノイドのみ使用しているた
め、セメントミルクのインピーダンスL1を初期値、即
ちセメント濃度300(kg/m3)時のL2の値1.
989 X 1O−4(H)として各セメント混合物の
セメント濃度を算出している。しかしこの場合、測定時
の温度変化やセメントミルク中の強磁性体の不均一等の
要因を相殺できず、その誤差は最高22%にも達する。
(That is, μm and l'eff are also changing.) This is thought to be caused by temperature changes during measurement, non-uniformity of the ferromagnetic material in cement milk, etc. However, similar temperature changes and non-uniformity of the ferromagnetic material occur when measuring L2 with cement mixture flowing in, so it is possible to cancel out these changes, and therefore the measurement error is also 6.0. % or less. In the comparative example, only one solenoid is used, so the impedance L1 of the cement milk is set to the initial value, that is, the value of L2 when the cement concentration is 300 (kg/m3), 1.
The cement concentration of each cement mixture is calculated as 989 x 1O-4 (H). However, in this case, factors such as temperature changes during measurement and non-uniformity of ferromagnetic material in cement milk cannot be canceled out, and the error reaches a maximum of 22%.

この様に本発明の測定方法及び装置を用いれば、リアル
タイムで測定誤差を解消することができ、特にセメント
ミルクのインピーダンスを常に測定できることがら、セ
メントミルクの濃度を変化させた場合やセメントミルク
中の強磁性体の種類や濃度を変化させた場合も個別に検
量線などを作製する事なくセメント濃度を測定すること
ができる。さらにセメント濃度をリアルタイムで測定で
きることから現場施工管理を円滑にかつ迅速にならしめ
るものである。
As described above, by using the measuring method and device of the present invention, measurement errors can be eliminated in real time, and in particular, since the impedance of cement milk can be constantly measured, the impedance of cement milk can be constantly measured. Even when changing the type or concentration of ferromagnetic material, the cement concentration can be measured without creating a separate calibration curve. Furthermore, since cement concentration can be measured in real time, on-site construction management can be done smoothly and quickly.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の測定装置の一実施例を示す図、第2図
は従来測定装置を示す図である。図中101と102は
パイプ、103と104はソレノイド、105はセンサ
ボックス、111はデータセレクタ、121はインピー
ダンスアナライザ、131はコンピュータ、141はプ
リンタを示す。
FIG. 1 is a diagram showing an embodiment of the measuring device of the present invention, and FIG. 2 is a diagram showing a conventional measuring device. In the figure, 101 and 102 are pipes, 103 and 104 are solenoids, 105 is a sensor box, 111 is a data selector, 121 is an impedance analyzer, 131 is a computer, and 141 is a printer.

Claims (2)

【特許請求の範囲】[Claims] (1)セメントに所定の比率で強磁性体が混合されたセ
メント混合物の透磁率を測定し、これにもとづいてセメ
ント混合物中のセメント量を測定するセメント混合物中
セメント量の測定方法において、強磁性体を所定の比率
で含むセメントミルクの透磁率を測定し、前記セメント
ミルクと同じ比率の強磁性体を含むセメントミルクをセ
メント原料として用いたセメント混合物の透磁率を測定
して前記セメントミルクとの透磁率の比を求めることに
よりセメント量を測定する事を特徴とするセメント混合
物中のセメント量の測定方法。
(1) In a method for measuring the amount of cement in a cement mixture, which measures the magnetic permeability of a cement mixture in which a ferromagnetic material is mixed with cement at a predetermined ratio, and measures the amount of cement in the cement mixture based on this, ferromagnetic The magnetic permeability of cement milk containing ferromagnetic material in a predetermined ratio is measured, and the magnetic permeability of a cement mixture using cement milk containing ferromagnetic material in the same ratio as the cement milk as a cement raw material is measured to determine the relationship between the cement milk and the cement milk. A method for measuring the amount of cement in a cement mixture, characterized by measuring the amount of cement by determining the ratio of magnetic permeability.
(2)少なくとも2つ以上の、巻き数と形状が同じソレ
ノイド、及び該ソレノイドのインダクタンスを測定する
装置、及び該ソレノイド内にセメントミルク及びセメン
ト混合物を収容する容器もしくはセメントミルク及びセ
メント混合物を該ソレノイド内で流動可能な容器とを備
えてなることを特徴とするセメント混合物中のセメント
量の測定装置。
(2) At least two or more solenoids with the same number of turns and the same shape, a device for measuring the inductance of the solenoid, and a container for storing cement milk and a cement mixture in the solenoid, or a container for storing cement milk and a cement mixture in the solenoid. A device for measuring the amount of cement in a cement mixture, comprising a container in which the cement can flow.
JP2797989A 1989-02-06 1989-02-06 Method and device for measuring the amount of cement in a cement mixture Expired - Lifetime JPH07119744B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2797989A JPH07119744B2 (en) 1989-02-06 1989-02-06 Method and device for measuring the amount of cement in a cement mixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2797989A JPH07119744B2 (en) 1989-02-06 1989-02-06 Method and device for measuring the amount of cement in a cement mixture

Publications (2)

Publication Number Publication Date
JPH02206756A true JPH02206756A (en) 1990-08-16
JPH07119744B2 JPH07119744B2 (en) 1995-12-20

Family

ID=12235976

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2797989A Expired - Lifetime JPH07119744B2 (en) 1989-02-06 1989-02-06 Method and device for measuring the amount of cement in a cement mixture

Country Status (1)

Country Link
JP (1) JPH07119744B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK202200523A1 (en) * 2022-06-02 2023-09-20 Smidth As F L Online and inline color control of processed material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK202200523A1 (en) * 2022-06-02 2023-09-20 Smidth As F L Online and inline color control of processed material
WO2023233347A1 (en) * 2022-06-02 2023-12-07 Flsmidth A/S Online and inline color control of processed material

Also Published As

Publication number Publication date
JPH07119744B2 (en) 1995-12-20

Similar Documents

Publication Publication Date Title
Heyen et al. Effect of moisture condition on concrete core strengths
CN104198732B (en) A kind of neutrophil gelatinase-associated lipocalin reagent box for detecting content
Tiwari et al. Rapid and nondestructive determination of seed oil by pulsed nuclear magnetic resonance technique
Schlichtkrull Insulin crystals
Ihamouten et al. On variants of the frequency power law for the electromagnetic characterization of hydraulic concrete
CN101470109A (en) Method for improving accuracy of blood sample leukocyte classifying result
Amziane et al. Measurement of workability of fresh concrete using a mixing truck
Climent et al. Analysis of acid-soluble chloride in cement, mortar, and concrete by potentiometric titration without filtration steps
Paredes et al. Precision statements for the surface resistivity of water cured concrete cylinders in the laboratory
CN112485438A (en) Specific protein reaction detection method and device
JPH02206756A (en) Method and device for measuring quantity of cement in cement mixture
He et al. Use of dielectric constant for determination of water-to-cement ratio (W/C) in plastic concrete: part 1. Volumetric water content modeling
Gulrez et al. Effect of aggregate type and size on surface resistivity testing
JPH02167464A (en) Method for measuring cement quantity in cement mixture
JPH02206755A (en) Measuring instrument for quantity of cement in cement mixture
Kuntze The Chemistry and technology of gypsum: a symposium
CN107656008A (en) The assay method of calcium oxide content in a kind of calcium stearate
Biever et al. Practical Measurement of Pore Solution Resistivity in Fresh Mixtures.
CN109613237A (en) A kind of cystatin C detection kit
US2781488A (en) Method and apparatus for measuring fluid saturation of core samples
JPH0387411A (en) Reclamation method for slurry in ground improvement works
CN112683347B (en) Fluid component flow measuring device and method
JPH0342569A (en) Method for measuring water and moisture sticking to particulate matter
JPS62106368A (en) Method for measuring unit water content of concrete
JPH02173559A (en) Ferromagnetic material for measuring cement quantity