METHOD OF TESTING BINDING MATERIALS FOR COLD-HARDENING MIXTURES FOR HEAT RESISTANCE Russian patent published in 2024 - IPC G01N5/04 G01N25/00 B22C1/00 

FIELD: testing technology.

SUBSTANCE: invention relates to a method of testing binding materials for cold-hardening mixtures for heat resistance. Technical result is achieved by testing method, which includes preparation of cold-hardening mixture, from which from 5 to 15 pieces of standard cylindrical samples with diameter of 50±5 mm and height of 50±5 mm are made. Then cured samples are held for 20–24 hours at room ambient temperature, after which the pre-weighed standard cylindrical sample on a metal plate is placed in a muffle furnace heated to 940±60 °C and held for 60 to 100 seconds. Standard cylindrical sample taken from the muffle furnace is cooled. Subsequent pre-weighed samples are placed one by one on a metal plate into a muffle furnace and held, increasing the time with step of 5–15 seconds. After cooling the samples, their crumbling is determined, for which each sample is placed in the central part of the mesh drum of the device for determining crumbling, which rotates for 30–120 seconds, after which each sample is removed and weighed, the value of crumbling of each standard cylindrical sample is calculated in percentage. Further, for each composition of binding materials, a graph is plotted, on which the value of crumbling of each sample in percent is plotted along the ordinate axis, and the duration of holding the samples in the muffle furnace is plotted along the abscissa axis. Plotted graph is used to determine heat resistance in seconds, which is equal to the duration of holding of standard cylindrical samples, at which the value of crumbling is 50%. After that, conclusion is made on heat resistance of binding materials.

EFFECT: obtaining quantitative evaluation of heat resistance of binding materials for cold-hardening mixtures, which enables to search and select suitable binding materials for cold-hardening mixtures.

17 cl, 7 dwg, 3 tbl, 1 ex