Method for retarding the setting of mortar and concrete...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 5/00 (2006.01) C04B 40/04 (2006.01) C04B 41/53 (2006.01) C09D 191/00 (2006.01)

Patent

CA 2656642

An exemplary method for set retarding the surface of a mortar or concrete material, comprising applying to the surface of a mortar or concrete, or to the inner surface of a mold for forming the mortar or concrete, a hot melt coating composition which is heated to assume a flowable or sprayable form, and allowing the hot melt coating composition to cool to ambient temperature whereby the composition forms a solidified membrane, and thereafter removing the membrane. Preferably, the hot melt coating composition contains at least one agent operative to retard the setting of the mortar or concrete, and optional finely divided particulate materials, light-reflective pigments, or mixtures thereof.

L'invention concerne un procédé exemplaire permettant de retarder la prise d'un mortier ou d'un composant du béton. Le procédé consiste à: appliquer à la surface d'un mortier ou d'un béton, ou sur la surface intérieure d'un moule destiné à former le mortier ou le béton, une composition de revêtement thermofusible chauffée de manière à présenter une forme fluidifiable ou pulvérisable; et laisser refroidir la composition de revêtement thermofusible à la température ambiante afin que la composition forme une membrane solidifiée, après quoi la membrane est retirée. De préférence, la composition de revêtement thermofusible contient au moins un agent pouvant retarder la prise du mortier ou du béton, ainsi que d'autres matières particulaires finement divisées facultatives, pigments de réflexion de la lumière, ou leurs mélanges.

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