Mitsubishi Materials Corporation

Hideo Tawara

Kiyoshi Kamitani

Kenji Tokunaga

Hiroshi Obata

Yoshihiko Murata

Keiji Saitou

Kozo Murata

Daisuke Kimoto

Yutaka Yamada

This rapid-hardening mortar composition includes: a rapid-hardening admixture; cement; and a fine aggregate, wherein the cement is contained in an amount of 100 parts by mass to 2,000 parts by mass with respect to 100 parts by mass of the rapid-hardening admixture, the rapid-hardening admixture is a composition that contains: calcium aluminate; inorganic sulfate in an amount of 50 parts by mass to 200 parts by mass with respect to 100 parts by mass of the calcium aluminate; and a setting modifier in an amount of 0.1 parts by mass to 10 parts by mass with respect to 100 parts by mass of the calcium aluminate, and an average particle diameter of the calcium aluminate is in a range of 8 &#x3bc;m to 100 &#x3bc;m, and an average particle diameter of the setting modifier is in a range of 5 &#x3bc;m or less.

Rapid-hardening mortar composition

The present invention provides a rapid-hardening admixture for accelerating hardening of a cement composition and a method for producing the same. The rapid-hardening admixture includes calcium aluminate, inorganic sulfate, and a setting modifier, in which the calcium aluminate has an average particle diameter in a range of 8 &#x3bc;m to 100 &#x3bc;m, and the setting modifier has an average particle diameter of 5 &#x3bc;m or less.

Rapid-hardening admixture and method for producing same

This rapid-hardening cement composition includes: a rapid-hardening admixture; and cement in an amount of 100 parts by mass to 2,000 parts by mass with respect to 100 parts by mass of the rapid-hardening admixture, wherein the rapid-hardening admixture is a composition that contains: calcium aluminate; inorganic sulfate in an amount of 50 parts by mass to 200 parts by mass with respect to 100 parts by mass of the calcium aluminate; and a setting modifier in an amount of 0.1 parts by mass to 10 parts by mass with respect to 100 parts by mass of the calcium aluminate, and an average particle diameter of the calcium aluminate is in a range of 8 &#x3bc;m to 100 &#x3bc;m, and an average particle diameter of the setting modifier is in a range of 5 &#x3bc;m or less.

Rapid-hardening cement composition

The NO -cleaning paving structure of the present invention comprises a concrete base layer , a paving layer and a surface layer as illustrated in FIG. . The surface layer comprises 100 parts by weight of cement, 5-50 parts by weight of titanium oxide powder and 100-700 parts by weight of aggregate, by which the surface layer on the paving layer can be provided with an NO -cleaning action and an excellent durability. In addition, pozzolan materials, particularly a blast furnace slag, or adsorbing materials can be added to the surface layer. The paving layer comprises an asphalt paving or a concrete paving , both of which may include the used paving layers. It is preferable that the asphalt paving is porous and the surface thereof has an unevenness. Additionally, it is preferable that the thickness of the surface layer is 1-300 mm for the concrete paving and 2-15 mm for the asphalt paving. Among cement, injection cement for half-flexible paving is preferable.

NOx removing pavement structure

An NO.sub.x -cleaning paving block comprising a surface layer which contains titanium dioxide and which is layered on a concrete-made base layer.

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Tokyo, Japan

Hideo Tawara