METHOD OF TESTING GYPSUM BINDER FOR SUITABILITY FOR PRODUCTION OF DRY PLASTER MIXTURES BASED THEREON AND TEST CONCENTRATE THEREFOR

摘要

FIELD: construction.;SUBSTANCE: group of inventions relates to construction industry and is intended for testing gypsum binder in factory, construction and scientific research laboratories for evaluation of efficiency of using said binder in formulations of plaster mixtures. Method comprises selection of normal density of gypsum dough, then adding a test concentrate into sample of gypsum dough of normal density. Determining setting time of sample with addition of test concentrate and sample surface temperature is measured during its solidification. Further, based on setting time of sample of gypsum dough and surface temperature thereof, suitability of gypsum binder for use in production of dry plaster mixture is determined. End of setting of sample of gypsum dough with test concentrate for dry plaster mixtures for machine application must not be shorter than 120 min or dry plaster mixture for manual application not shorter than 45 min, and surface temperature of sample of gypsum dough during its hardening must not exceed 40 °C. Test concentrate is a dry powder composition containing hydrated lime and tartaric acid in ratio 40:1 parts by weight.;EFFECT: higher efficiency and reliability, accelerated tests.;7 cl, 2 tbl