Title:
【発明の名称】スメクタイト粘土含有凝集物を含むコンクリートに対するEO/PO超可塑剤の添加を最適化させるための添加剤及び方法
Document Type and Number:
Japanese Patent JP2002506415
Kind Code:
A
Abstract:
In the preparation of aqueous cement compositions containing a plasticizer, such as an EO/PO polymer-containing plasticizer, or EO/PO comb polymer-containing plasticizer, and further containing clay, such as a smectite clay, which expands when in contact with water, the step of providing an agent operative to modify the clay whereby the plasticizer absorbing capability of the clay is reduced. In exemplary methods of the invention, the plasticizer is an EO/PO (e.g., oxyalkylene) plasticizer and preferably an EO/PO comb polymer, and the clay-activity-modifying agent may comprise an inorganic cation, an organic cation, a polar organic molecule capable of being absorbed by the clay, a clay dispersant (such as a polyphosphate), or a mixture thereof. For clay-activity-modifying agents which comprise a cation or a polar organic molecule, the agent is preferably added to the clay before water is introduced to the clay. For clay dispersant agents and some organic cations such as quaternary amines (which have a strong affinity for cationic exchange with the clay), the agent may be added before, during, or after water is introduced to the clay.
Inventors:
The Jardine, Leslie A
Hideo Oyada
Fouliard, Kevin Jay
Oh, Chee Chi
Jachi Moitsutsu, Huerek
Chiyun, Byung-wa
The Eknabo Borian, Ala A
Hill, Criston El
Hideo Oyada
Fouliard, Kevin Jay
Oh, Chee Chi
Jachi Moitsutsu, Huerek
Chiyun, Byung-wa
The Eknabo Borian, Ala A
Hill, Criston El
Application Number:
JP50489899A
Publication Date:
February 26, 2002
Filing Date:
June 19, 1998
Export Citation:
Assignee:
Doublet Earl Grace and Company Connecticut
International Classes:
C04B14/10; C04B24/24; C04B24/42; C04B28/02; C04B103/30; (IPC1-7): C04B28/02; C04B14/10
Domestic Patent References:
| JPH07215746A | 1995-08-15 | |||
| JPH08165157A | 1996-06-25 |
Attorney, Agent or Firm:
Heiyoshi Odashima (1 person outside)