Journal of the Ceramic Association, Japan

[title in Japanese]

[in Japanese]

1939 Volume 47 Issue 560 Pages 395-396
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_395

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[in Japanese]

1939 Volume 47 Issue 560 Pages 396
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_396

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STUDIES ON THE THERMAL CHANGE OF THE ROSEKI ORE BY THE DIFFERENTIAL THERMAL ANALYSIS, II

Takeo Ao

1939 Volume 47 Issue 560 Pages 397-400
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_397

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The author tried to determine the mineral component and economical value of the roseki ore from its thermal change by the differential thermal analysis and found that the presence of a little quantity of the alunite (K₂O₃Al₂O₃4SO₃6H₂O) in the roseki ore reduces the economical value and quality of the roseki ore for refractory material. The results found out are as follows.
The Thermal Change of the Roseki Ore.
1. As the results of these experiments, it becomes clear that the first endothermal reactions produced in No. 1-No. 10 correspond to the dehydration and the second in No. 3, No. 4 and No. 10 to the explusion of SO₂ in the alunite.
2. Exothermal reactions taking place at temperatures from 944°C to 960°C in No. 2, No. 4, No. 6, No. 7 and No. 9 always show the presence of the kaolinite in the roseki ore.

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese]

1939 Volume 47 Issue 560 Pages 401-402
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_401

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UNTERSUCHUNGEN ÜBER DER ZEMENTFEINHEIT, IV

Kimbe Tyudyo

1939 Volume 47 Issue 560 Pages 403-409
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_403

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Wir haben bisher nicht genügend genaue und rationale Berechnungsmethoden der Ze-mentoberfläche befunden. Der Verfasser diskutierte die Ungenauigkeit der sogennanten “innere Oberfläche”, welche von Prof. Dr. H. Kühl zuerst vorgeschlagen wurde und als eine vertretende Berechnungsgleichung angesehen wird.
Um noch wahreres und sichereres Resultat zu erreichen, können wir die folgende Glei-chung zugrundlegen,
S₁=∫_x1^x2dS₁=-c₂/σc₁∫_x1^x2dR/xdxdx… (I)
worin
S₁: spezifische Oberfläche
c₂, c₁: der Zementen eigene Konstante
σ: spezifisches Gewicht
R: Verteilungsfunktion von Korndurehmesser x,
und müssen die folgenden Probleme erklären.
(1) Die statistischen Gestalten der Zementkörner und ihre Ähnlichkeit.
(2) Das Verhältniss c₂/c₁.
(3) R(x) als Funktion von x.
(4) Die obere und untere Grenze x₂, x₁ des Integrals (I).
In Bezug auf (1) und (3), berichteten wir schon in der letzten Untersuchung III und als Erfolg der Erforschung in diesem Bericht nun fanden die Werte für c₂/c₁, x₂ und x₁; nähmlich 6 für c₂/c₁, 100μ für x₂, 1μ für x₁, wenn wir als x den durch Dr. Guttmann zuerst vorgeschlagenen Durchmesser √f annehmen werden.
Nach oben angezeigten und schon erwiesenen Voraussetzungen, besteht die folgende Berechnungsgleichung der spezifischen Oberflächen,
S=6/σk∫_10^-4^{10^-2}e^-kx/xdx+1-e^{-10^-4k}/5σ×10⁵(cm²g^-1)…(II)
Schliesslich konnten wir vier Tabellen erhalten, durch welche die spezifischen Oberfläche der Zemente leicht zu finden sind.

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Erratum

1939 Volume 47 Issue 560 Pages 409
Published: 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_409

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STUDIES ON BLENDED CEMENT, III

Kozaburo Watanabe

1939 Volume 47 Issue 560 Pages 410-411
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_410

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Heat of Hydration.
Author used two double thermos bottles and determined the temperature increase by setting cement paste. The cement taken was 260g and standard consistency, test piece of φ5×10cm was adopted.
Author said from his experiment that heat of hydration of blended cement used rich silicious admixture generated more slowly than portland cement but the one used aluminous all most the same. Radiation of heat was slowly.
Resistance to Fire.
φ5×10cm test piece of 1:1:2 wet mortar was used. After 1 day in moist closet, 6 days in water and 21 in air cured, test pieces were heated in electric muffle ofen until 300°C, 500°C, 700°C, 800°C in 2 h and more 1h. kept at the temperature. Pieces were cooled until room temperature, then put to crushing test.
Mortar of blended cement was better resistant to fire than portland cement. When heated at 800°C the absolute strength of blended cement became stronger than the latter.
Aeration
Aeration of blended cement was comparatively smaller than portland cement.
Abrasion
Degree of abrasion of blended cement was all most the same of portland cement.

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STUDIES ON BLENDED CEMENT, IV

Kozaburo Watanabe

1939 Volume 47 Issue 560 Pages 412-414
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_412

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Curing method and Strength
Author tested the influence of three curing conditions on the strength of 13×13×13cm concrete cube. After moulding the concrete was kept to stand for 24h. in room and stored respectively as following
(1) outdoors in sun shine
(2) in room
(3) in water
Strength of blended cement concrete was greater influenced than the portland cement by the curing condition.
Temperature and Strength.
1:3 dry mortar and 1:1:2 wet mortar of blended cement.
“Silica cement” Super cement and normal portland cement were adopted. The test pieces after standing for 24h. in dampf closet were stored in the water of 15°C, 20°C and 30°C.
Effect of temperature of storage water was greatest on the strength of silica cement mortar and least on the normal cement.
When water temperature was high the tensile or bending strength of silica cement dry mortar was affected less and of wet mortar more than the compressive strength. When temperature was low the former of dry or wet was less influenced than the latter.

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STUDIES ON BLENDED CEMENT, V

Kosaburo Watanabe

1939 Volume 47 Issue 560 Pages 414-415
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_414

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Study on Calcination of Admixture.
Calcination temperature and its hygrometric property of admixture.
Author know, the best calcination temperature of Kamegawa Kayohakudo was 500°C. The hygrometrie degree decreased as the calcination temperature increased until 700°C but at higher it became constant.
Properties of Blended Cement that used Calcined Admixture.
The setting time of blended cement used calcined admixture, in this case Kayohakudo, was shorter than noncalcined.
Compressive strength of early age of the tensile and compressive strength of 28 days were stronger when calcined admixture used.
The best effect of calcination was given when ratio of admixture and clinker was 20:80.

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ON THE DUST COLLECTING OR SEPARATING PROBLEM, III

Efficiency of dust chamber

Jun-iti Isobe

1939 Volume 47 Issue 560 Pages 416-421
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_416

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Dust chamber efficiency generaly repressented by the weight ratio of precipitated dust and total dust flow into dust chamber. The examination performed to asuring the uncertainty of experiment, reported in second article, subjected to this efficiency finding method. On measurement of total dust and residual dust generaly apply a gas extraction method, but here under several assumptions chose a calculation method. But this calculation method has a week point that any assumption be not proper, the results become unreliable, the results checked by chemical contents of dust which related to fineness of dust. Of course fineness of precipitated dust directly may not indicate a said efficiency but it is evident that more the efficiency be rise, more the fine particle be settle, therefore if we know efficiency and fineness of precipitated dust of standard chamber, on the comparison of fineness of dust particle, we can find an efficiency of test chamber. I choose a cottrell for a standard chamber and utilize a relation, hold on fineness and chemical contents of dust, for finding of fineness of precipitated dust. These examinations, however, give no sufficient result, then I tryied a direct measurement of efficiency by using a small dust collecting apparatus and chancely I see followers;
1, Dust contents of branched flow generaly differ from dust contents of main flow.
2, On measurement of efficiency of dust chamber, if chamber treats a branched flow, measure may not repressents its said efficiency.

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Erratum

1939 Volume 47 Issue 560 Pages 421a
Published: 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_421a

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Erratum

1939 Volume 47 Issue 560 Pages 421b
Published: 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_421b

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[title in Japanese]

[in Japanese]

1939 Volume 47 Issue 560 Pages 422-425
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_422

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[title in Japanese]

1939 Volume 47 Issue 560 Pages 426-432
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_426

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[title in Japanese]

1939 Volume 47 Issue 560 Pages 433-441
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_433

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[title in Japanese]

1939 Volume 47 Issue 560 Pages 448-451
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_448

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[title in Japanese]

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1939 Volume 47 Issue 560 Pages Plate1-Plate2
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_Plate1

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[title in Japanese]

1939 Volume 47 Issue 560 Pages ap1-ap16
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_ap1

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese]

1939 Volume 47 Issue 560 Pages ap17-ap18
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_ap17

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese]

1939 Volume 47 Issue 560 Pages ap19
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_ap19

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[title in Japanese]

[in Japanese]

1939 Volume 47 Issue 560 Pages ap20-ap21
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_ap20

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[title in Japanese]

[in Japanese]

1939 Volume 47 Issue 560 Pages ap22-ap34
Published: August 01, 1939
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.47.560_ap22

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