METHOD OF TESTING GYPSUM BINDER FOR SUITABILITY FOR PRODUCTION OF DRY FLOOR MIXTURES BASED THEREON AND TEST CONCENTRATE THEREFOR Russian patent published in 2016 - IPC G01N33/38 C04B11/00 

FIELD: construction.

SUBSTANCE: group of inventions relates to construction industry and is intended for testing of gypsum binder for evaluation of efficiency of using said binder in formulations of dry construction mixtures, specifically floor mixtures. Method comprises selection of normal density of gypsum dough, then reducing amount of water by 2-2.5 times and preparing a sample of gypsum dough with addition of test concentrate. Determining flow diameter of sample of gypsum dough, setting duration thereof and measuring surface temperature of sample during solidification thereof. Further, from part of sample of gypsum dough, obtaining at least six samples and determining ultimate compression strength. Then based on flow diameter of sample of gypsum dough, setting duration thereof, surface temperature and ultimate compression strength, determining suitability of gypsum binder for use in production of dry floor mixtures. Flow diameter of must be at least 20 cm, end of setting should be not later than 120 min, surface temperature must be equal to or higher than 40 °C, and ultimate compression strength of samples must be at least 15 MPa. Test concentrate is a dry powder composition containing plasticiser, and setting retarder, ratio of which is 3:1 weight parts.

EFFECT: higher efficiency and reliability, accelerated tests.

8 cl, 2 tbl