Preparation method of standard gypsum and application of standard gypsum in detection admixture

• Main Authors: ZHU GUOLIANG, HE XINZHOU, XU LIBIN, SHI WENFENG, NIE XIAOPENG, CHEN YISU, CHEN SHANGWEI, LI ZEGANG, LIAO CHANG, ZHOU LING, CUI CHEN, GAO WENYI, LUO TONG
• Format: Patent
• Language: Chinese; English
• Published: 22.10.2021
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; CONCRETE; INORGANIC CHEMISTRY; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIME, MAGNESIA; MEASURING; METALLURGY; PHYSICS; REFRACTORIES; SLAG; TESTING; TREATMENT OF NATURAL STONE

The invention belongs to the technical field of gypsum modification, and particularly relates to a preparation method of standard gypsum and application of the standard gypsum in a detection admixture. A modifier is prepared from ethylenediamine tetraacetic acid and silicic anhydride, and surface modification treatment is carried out on natural gypsum, so that the content of semi-aqueous phase gypsum (HH) is greater than or equal to 75%, the content of diaqueous phase gypsum (DH) is less than 3%, and the content of soluble anhydrous phase gypsum (AIII) is less than 3%. And the prepared gypsum can be used as reference gypsum, and the performance of the gypsum admixture can be tested and evaluated. 本发明属于石膏改性技术领域，具体涉及一种基准石膏的制备方法及其在检测外加剂中的应用；采用乙二胺四乙酸和硅酸酐制成一种改性剂，对天然石膏进行表面改性处理，使其物相构成为：半水相石膏(HH)含量≥75％，二水相石膏(DH)含量＜3％，可溶性无水相石膏(AⅢ)含量＜3％。且制备得到的石膏可作为基准石膏，对石膏外加剂的性能进行测试评价。