Journal of the Ceramic Association, Japan

[title in Japanese]

[in Japanese]

1932 Volume 40 Issue 476 Pages 489-499
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.489

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Der Verfasser untersuchte die Hydratation vom franzoesischen Tonerdeschmelzzement “Ciment fondu” auf chemisch-mikroskopischem Weg, und kam zu dem Schluesse:-
1) Bei der Hydratation vom Ciment fondu wird erst das Kalkhydrat, durch Zersetzung des Kalksilikates enthalten im Zement gebildet, welches mit Monocalciumaluminat in der Loesung bindet, und das Dicaleiumhydroaluminat der Zusammensetzung 2CaO⋅Al₂O₃⋅7.5 H₂O bildet nach folgender Gleichung:-
CaO⋅Al₂O₃+Ca(OH)₂+6.5H₂O=2CaO⋅Al₂O₃7.5H₂O
Diese Reaktion verlaeuft sehr energisch, wenn genug Kalkhydrat in der Loesung vorhanden ist. Da aber der Gehalt an Kieselsaeure im Ciment fondu klein ist, und nicht viel Kalkhydrat bei der Hydratation gebildet, findet die obengenannten Reaktion, wegen der kleiner Kalkkonzentration, verhaeltmaessig langsam statt, und hoehrt auch bald auf.
2) Wenn alles Kalkhydrat in der Loesung verbraucht wird, dann faengt der Haupthydrat ationsvorgang; Das Monocalciumaluminat gibt ein (I/2 Molekuel) Tonerdehydrat ab, aendert sich in Dicalciumhydroaluminat:-
2(CaO⋅Al₂O₃)+10.5H₂O=2CaO⋅Al₂O₃⋅7.5H₂O+Al₂O₃⋅3H₂O
Das Erhaerten des Tonerdeschmelzzementes ist hauptsaechlich zu diesem Hydratationsvorgang zuruckzufuehren.
3) Das Dicalciumhydroaluminat, welches in ganz kleiner Menge in der Loesung bleibt, gibt eine anderes Molekuel Tonerdehydrat ab, und aendert sich in das Tricalciumaluminat:-
3(2CaO⋅Al₂O₃)+H₂O→2(3CaO⋅Al₂O₃)+Al₂O₃⋅3H₂O
und das Tricalciumaluminat so gebildet, bleibt in der Loesung, zerlegt mit der Zeit in das Kalkhydrat und Tonerdehydrat:-
3CaO⋅Al₂O₃→3Ca(OH)₂+Al₂O₃⋅3H₂O
Diese letzte zwei Reaktionen finden in ganz minimaler Menge statt, weil die Loeslichkeit des Dicalciumhydroaluminates im Wasser nicht gross ist, und sie sind dem ordentlichen Erhaerten des Tonerdeschmelzzementes praktisch einflusslos.

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1932 Volume 40 Issue 476 Pages 500-506
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.500

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6 portland cements with silica modulus (S. M.) 2.5, iron modulus (I. M.) 1.8 and hydraulic modulus (H. M.) ranging from 1.9 to 2.4, 14 of the cements with H. M. 2.4, S. M. and I. M. ranging from 1.1 to 2.5 and from 0.4 to 4.0 resp., and 2 high-lime portland cements containing chromic oxide have been prepared. They were examined for the content of free lime and the small-piece compressive strength with the results as follows:
(1) Some free lime was detected in the cements with H. M. 2.3 or higher even when they were fired at cone 18 for 20 minutes.
(2) The strength of 1:3 mortars increased with an increase of H. M.
(3) In those cements with H. M. 2.4, the influences of S. M. and I. M. upon the amount of free lime were remarkable, and those raw mixtures showing the minimum contents of free lime for a given firing temperature decreased their I. M. with an increase of S. M.
(4) The replacing of some alumina or ferric oxide by chromic oxide seemed rather to retard the combination of lime.
(5) In the cements with H. M. 2.4, the relation between the strength and the chemical composition varied with the age of the test pieces and the method of curing. A cement with a medium S. M. and a low I. M. showed an high 4 week strength when cured in water, while a cement with a low S. M. and a low I. M. had a very high 4 week strength on combined curing.
(6) An introduction of chromic oxide replacing some part of alumina seems to improve the strength on both water and combined curings.

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1932 Volume 40 Issue 476 Pages 507-511
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.507

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1932 Volume 40 Issue 476 Pages 511-513
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.511

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1932 Volume 40 Issue 476 Pages 514-515
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.514

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[in Japanese]

1932 Volume 40 Issue 476 Pages 515-516
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.515

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1932 Volume 40 Issue 476 Pages 516-521
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.516

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1932 Volume 40 Issue 476 Pages 522-542
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.522

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1932 Volume 40 Issue 476 Pages 543-545
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.543

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1932 Volume 40 Issue 476 Pages 545-553
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.545

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1932 Volume 40 Issue 476 Pages 556
Published: August 01, 1932
Released on J-STAGE: April 30, 2010

DOIhttps://doi.org/10.2109/jcersj1892.40.556

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