…The method of burning similar natural rocks spread throughout Europe, producing natural cement, but the composition of natural cement varied widely, making it unreliable. In 1824, J. Aspdin of England invented a method of mixing clay and limestone and burning it, giving birth to modern cement whose composition could be adjusted. It is said that this cement was named Portland cement because the color of the hardened cement was very similar to that of stone mined from the Isle of Portland in the UK. … [Cement Industry]...In addition, after World War II, many new entrants from other industries entered the market, resulting in a high ratio of manufacturers with multiple businesses, and the high market share of the top manufacturers (Mitsubishi Mining Cement (now Mitsubishi Materials), Onoda Cement (now Chichibu Onoda), Nippon Cement, and Sumitomo Cement (now Sumitomo Osaka Cement)). In 1824, British bricklayer Joseph Aspdin discovered that by mixing limestone and clay, baking it, crushing it, adding water, and kneading it, a material similar to hard rock was created. He named this Portland cement. ... *Some of the terminology explanations that mention "Aspdin, J." are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…同様な天然岩石を焼成する方法はヨーロッパ各国に広まり,天然セメントが製造されたが,天然セメントは成分変動が大きいため信頼性に欠けた。1824年にイギリスのアスプディンJ.Aspdinにより粘土と石灰石を混合して焼成する方法が発明され,成分調製が可能な近代的セメントが誕生した。このセメントの硬化したものがイギリスのポートランド島から産出される石材の色とよく似ていたためポルトランドセメントportland cementと命名されたといわれる。… 【セメント工業】より…また,第2次大戦後,他産業からの新規参入が多かったため,兼業メーカーの比率が高いこと,上位メーカー(三菱鉱業セメント(現,三菱マテリアル),小野田セメント(現,秩父小野田),日本セメント,住友セメント(現,住友大阪セメント))の市場占有率が高いことも特徴的である。 1824年,イギリスの煉瓦工アスプディンJoseph Aspdinは石灰石と粘土をまぜあわせたものを焼き,これを粉砕して水を加えて練ると,硬い岩石に近いものができ上がることを見いだした。これを彼はポルトランドセメントと名づけた。… ※「Aspdin,J.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
...The lute's revival in Germany coincided wi...
This is an alphabet that was created in India arou...
This is the common name for Byodo-ji Temple, a Shi...
…the rate of change in velocity over time is expr...
The maximum distance from the center of the galaxy...
…After returning to Japan, he wrote many dissonan...
… [Takahiro Matsui]. … From [Gecko (Gecko)] ...In...
The outer layer of the cell wall of some bacteria....
The smallest of the five Great Lakes in North Amer...
One of the main materials that make up the core of...
A general term for Muslims living in the Philippin...
An asexual reproductive organ that develops on the...
…During this time, the capital was moved from Auc...
… A trolley pole is used on low-speed trains and ...
1866‐1907 A revolutionary Chinese businessman. His...