Re: торопитесь со своим "неверно",

Автор сообщения: gorm
Дата и время сообщения: 24 June 2004 at 23:53:52:

В ответ на сообщение: Re: торопитесь со своим "неверно",

Начет в Европе - не уверен. Но вот он запатентовал свое - значит не европейское:

"Smeaton, an English engineer, reported in 1756 the presence of
clay in the hydraulic-lime limestones, but this observation passed
unnoticed. A distinguished practitioner, the designer of important
works, he enjoyed a great reputation as an engineer, but had no
authority as a chemist.

Several years later, the Swedish savant, Bergmann, having
analyzed the hydraulic-lime limestones of Lena, found in them
several percent of manganese and attributed the hydraulic
properties of the lime to the presence of this body. This opinion,
because of the authority of the illustrious reputation of its author,
was accepted without discussion."

"The first precise and exact observation upon the hydraulic-limes is
due to Collet-Descotils, Mining Engineer, Professor of Chemistry
at the Ecole des Mines. In 1813 he gave in a note a few lines long
inserted in the Annales des Mines, the analysis of the limestones
and the lime of Senonches and called attention on this occasion to
the fact that the silica of the lime was soluble in acids, whereas that
of the limestones was not, which demonstrates that during the
calcinations there had been a combination of the silica with the
lime. He attributed the hydraulic properties of the lime to the
compounds thus produced (Le Chatelier 1905:40-41)."

"It is some years later, in 1818, that Vicat gave his first memoir
upon the hydraulic limes. We know that to this engineer belongs
by far the largest share in the development of our theoretical and
experimental information on mortars. Seconded by the intelligent
protection of M. Becquey, Director General of the Ponts et
Chaussees et des Mines, he devoted himself exclusively to the
study of this important question and succeeded in establishing the
general constitution of limes and hydraulic cements, in defining the
most favorable conditions for their manufacture and their use; so
that he is justly considered as the creator of this industry which
was not long expanding from France over all of Europe
(LeChatelier 1905:41)."

Вопрос терминологии - называют Concrete

То что между каменных блоков вроде бы никто не называет бетоном.

heating - простое нагревание, а не обжиг. Обжиг = calcine.
Технология обжига это разложение СаСО3 требующее градусов 1200С или 800С с недожегом. Эта технология там не применялась.

А это что такое:

"While experimenting with lime, he found that a limestone containing clay produced a mortar, when calcined, slaked and mixed with sand, capable of hardening under water. This discovery enabled him to lead the reconstruction of the Edystone Lighthouse in the mid 1700's. He later published his experiments within A Narrative of the Building of the Edystone Lighthouse in 1791. LeChatelier outlines the circumstances involving acceptance of this finding, which claims that clay acts as the material substance conferring hydraulic properties to mortar."

Paul J.Krumnacher. Mater Thesis.
Lime and Cement Technology: Transition from
Traditional to Standardized Treatment Methods

В естественных гидравлических цементах, как и в обычном портландцементе важнейшую роль играют не карбонаты, а аллюмосиликаты. В его матрице содержится до 20% глины. При смешивании с песком и водой в нужной пропорции происходит отвердевание. См. дипломную работу. Кстати, на Руси открыли цемент тоже рано. Обнаружено, что при строительстве к извести примешивали мельченую обожженую глину (цемянку), что придавало затвердевшему раствору большую устойчивость.

Нет, ну Вы в своем репертуаре. Что некоторые бетонные конструкции в Египте есть - это же признано.

Конечно есть, Ассуанская ГЭС, например.

1719. радиоуглерод и пирамиды - d-te 16:07 24.06.04 (188)
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