JPS645531A - Mark collecting method - Google Patents

Abstract

PURPOSE:To improve workability, to collect a sharp impression within a short time and to preserve a cured body for a long period of time, by casting a cementicious quick hardening material on a mark surface to be collected to obtain the cured body. CONSTITUTION:A mark is the three-dimensional footmark impressed on the surface of soil or sand, the almost three-dimensional footmark impressed on a slide surface body by mud, the footmark in water or the footmark or tire mark in snow. A cementicious quick hardening material to be used is based on ultra-quick hardening cement and fly ash, a shaft furnace slag fine powder, a silica powder, a defoaming agent, a fluidizing agent and a thickener are added to said cement if necessary and, as a suitable example, a mixture consisting of 50-100pts.wt. of ultra-quick hardening cement, 50pts.wt. or less of fly ash, 2pts.wt. or less of the defoaming agent, 50pts.wt. or less of the fluidizing agent and 5pts.wt. or less of the thickener is designated. Then, 30-60pts.wt. of water is added to the cementicious quick hardening material and well kneaded therewith to prepare a pasty mixture which is, in turn, cast on the surface of an object to be collected and allowed to stand until cured.