Other

Taisei Corporation

Yasuro Ito and Taisei Corporation

Yoshiro Higuchi

Yasuro Ito

Yasuhiro Yamamoto

Masanori Tsuji

Hideharu Kaga

Mitsutaka Hayakawa

Kenji Kuroha

Yukikazu Tsuji

Takeshi Shiki

Yutaka Mochida

Takashi Nakamura

Hiroshi Tada

Tadayuki Sumita

Yasunori Matsuoka

Eiichi Tazawa

Seiji Kaneko

Koichi Tomikawa

Sampei Kemmochi

Norio Marushima

Seiichi Aida

Method of preparing mortar or concrete

A method and apparatus of measuring water percentages of a fine aggregate comprising the steps of prewetting the fine aggregate, containing the prewetted fine aggregate in an air-tightly closed container, applying a centrifugal force to said container over a predetermined period to remove a portion of a quantity of water deposited on the fine aggregate, and measuring the water content remaining in or on the fine aggregate after being subjected to the centrifugal force, and thus determining a percentage of water adhered to the fine aggregate and a percentage of water of the fine aggregate in which interstice thereof is saturated with water while a surface thereof is dry.

The quantity of water on the surface of sand particles is reduced by applying an impact force, e.g. centrifugal force created by a rotating disc. The sand particles thus treated are especially suitable for preparing a green concrete compound or a cement mortar by mixing them with water, gravel and cement.

Apparatus for adjusting the quantity of liquid deposited on fine

A quantity of water deposited on sand particles is adjusted to a predetermined value by utilizing a method and apparatus disclosed having a hopper through which the sand particles to be treated are supplied. A velocity energy is imparted to the particles to project them in a predetermined direction, thereby causing the particles to collide against rotating drums. As a result of the collision, a portion of a quantity of water initially deposited on the particles is removed therefrom and transferred to the drums, which is thereafter separated from the drums by a centrifugal force created by rotation of the drums. A plurality of notches or slits may be formed to axially extend along the periphery of the drums so that the deposited water moving along the periphery will tend into contact with be separated therefrom when it comes to one of the notches or slits. An air jet stream passing through the respective slits to the outside will function to facilitate the water removal from the periphery of the drums. Alternatively or in combination therewith, nozzle means may be provided for scraping or absorbing the deposited water from the drums.

Method and apparatus for adjusting the quantity of water deposited on a

One of ingredients of green concrete are supplied to a rotary disc through a central tube by a pump or low pressure air and the other ingredient is supplied to the rotary disc from a hopper by a screw conveyor. These ingredients are mixed together on a rotary disc and then projected by centrifugal force.

Method and apparatus for applying mortar or concrete

In the preparation of a cement paste about 30 to 76% of the total water is added to the cement to form a funicular state, capillary state or slurry state, and the resulting mixture is kneaded so as to reduce the coagulated lumps of cement. Then the remaining quantity of water is added and the composition or mixture is kneaded again. Sand and/or gravel may be incorporated after the firstly kneaded mixture. The resulting cement paste, mortar or green concrete exhibits a small percentage of bleeding water and products prepared therefrom have a high compression strength.

Method of preparing kneaded compositions

Method and apparatus for adjusting the quantity of liquid deposited on

A green concrete mortar is prepared by the steps of preparing a first composition in which water is uniformly deposited about the particles of sand, preparing a second composition consisting of a powder of cement, mixing together the first and second compositions, thus forming stable shells about the particles of the sand, the shells having substantially a constant ratio of water to cement, and adding water to the shelled sand and then kneading the resulting mixture. The green concrete mortar can be poured into a moulding frame prepacked with a coarse aggregate i.e. gravel. After incorporating gravel into the mortar, the resulting green concrete can be moulded or blasted. The green concrete can be readily conveyed to a working station for constructing tunnels, buildings or the like.

Method of preparing green compositions containing a hydraulic substance

A slurry shaped freshly mixed fluid compound such as paste or mortar and coarse or fine aggregate are conveyed under pressure through discrete conduits and then mixed together substantially immediately before blasting. The mixture is blasted through a nozzle against a body to be covered with concrete.

Method of blasting concrete

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Tokyo, Japan

Yoshiro Higuchi