摘要:
This invention is based on the discovery by the inventors that, if a preliminary hydration hardening process and a full-scale hydration hardening process are provided after the molding process, and a process for burning a hardened body of cement at a high temperature is provided between the preliminary and full-scale hardening processes, it is possible to obtain a molded product of cement having a higher mechanical strength than any such product according to any known method including no such burning process.According to this invention, there is provided a method of manufacturing a product of cement having high mechanical strength, which method comprises the steps in sequence of adding water, and if required, glass fibers or other reinforcing material, into a mixture of cement and an aggregate, and kneading the whole completely; molding the kneaded mixture into a desired shape; hardening the molded body preliminarily by hydration; burning the preliminarily hardened body at a high temperature; and hardening the burned body on a full scale by hydration.
摘要:
A novel method for producing a high-strength inorganic cement article is provided. The method comprises kneading under high shearing force a cement mixture containing as essential components hydraulic cement, a hydrophilic organic binder and water, molding the kneaded mixture into an article having a water-to-solid weight ratio of not more than about 0.2, preliminarily hydrating the molded article, firing the preliminarily hydrated article at about 300.degree. to about 1000.degree. C., and then rehydrating the fired article. The resulting cement article has bending strength of not lower than about 200 kgf/sq.cm without fibrous reinforcing materials and has that of not lower than about 350 kgf/sq.cm when reinforced with heat-resistant fiber materials. The cement article can be advantageously glazed in the above mentioned method by applying a glazing agent to a desired surface of the preliminarily hydrated article and then firing the article.
摘要:
The present invention provides a plate brick having a low amount of generation of smoke and a gas with a pungent odor during use, and exhibiting high durability. A plate brick of the present invention is obtained by: adding an organic binder to a refractory raw material mixture containing 0.5 to 20 mass % of aluminum and/or aluminum alloy; kneading the mixture with the organic binder; forming the kneaded mixture into a shaped body; and subjecting the shaped body to a heat treatment at a temperature of 400 to 1000° C., wherein the plate brick is obtained without being impregnated with a carbon-containing liquid material comprising tar or pitch, after the heat treatment. The plate brick has a compressive strength of 180 MPa or more, and a weight-increasing rate of 1% or less as measured in a hydration test using an autoclave.
摘要:
The grid interconnection device connected to the bank where alternating-current power is transmitted and to the power supply device provided to a customer includes: a detector detecting start of the alternating-current power transmission based on a state of the alternating-current power; a receiver receiving a grid interconnection start instruction for starting grid interconnection between the bank and the power supply device; and a grid interconnection controller controlling the bank and the power supply device to be interconnected or separated, in which the grid interconnection controller starts grid interconnection between the bank and the power supply device upon receipt of the grid interconnection start instruction in a state where the start of the alternating-current power transmission is detected.
摘要:
A clip includes a female member, a male member, and a connecting piece. The female member is formed in a cylindrical shape with two open ends, and has an outer flange at an upper cylinder end. A flexible engaging piece is formed in a side section defined by slits formed in the side section, and is provided with an engaging surface facing the outer flange. The male member is formed of a leg shaft and a head provided at an upper end of the leg shaft for a pushing operation. The connecting piece connects the head of the male member with the outer flange of the female member, so that a lower end of the leg shaft of the male member is positioned directly above the upper cylinder end of the female member.
摘要:
A clip includes a female member, a male member, and a connecting piece. The female member is formed in a cylindrical shape with two open ends, and has an outer flange at an upper cylinder end. A flexible engaging piece is formed in a side section defined by slits formed in the side section, and is provided with an engaging surface facing the outer flange. The male member is formed of a leg shaft and a head provided at an upper end of the leg shaft for a pushing operation. The connecting piece connects the head of the male member with the outer flange of the female member, so that a lower end of the leg shaft of the male member is positioned directly above the upper cylinder end of the female member.
摘要:
Disclosed is a dental-caries detecting solution prepared by dissolving a dye capable of staining a carious region of a tooth to provide enhanced visibility of the carious region, in a water-miscible organic solvent, which is capable of distinctively staining only a first decalcified layer, or an outer layer of a softened dentine, to be removed, absolutely without staining a second layer, or an inner layer of the softened dentine, which should not be removed. In the dental-caries detecting solution, the water-miscible organic solvent contains a compound having a carbon number of 11 or more and including one or more hydroxyl groups. The water-miscible organic solvent is adjusted such that the dental-caries detecting solution has a viscosity of 300 to 1500 Cp.
摘要:
A disc-shaped optical record carrier includes a first area having a spiral track extending in a first direction from an inner side on the disc, and a second area having a spiral track extending in a second direction opposite to the first direction, from an outer side on the disc located on the same plane as the first area on the disc, wherein one of the first and second areas is assigned a recordable area and the other is assigned a read only area.
摘要:
An trim material for the interior of an automobile obtained by successive injection molding. The trim comprises a surface layer and a base layer. The surface layer is formed from a composition comprising: (A) a partially cross-linked thermoplastic elastomer comprising a polypropylene resin and an &agr;-olefin copolymer rubber, and (B) a polybutylene-1 resin. The base layer is formed of a polypropylene resin or a blend of polypropylene resin and an organic filler. The interior trim material is lightweight, is easily recycled, and generates no hazardous gas when incinerated.