Method for measuring setting time of building gypsum

Abstract

Provided in the invention is a method for measuring setting time of building gypsum. The method comprises: adding a gypsum sample into water and then carrying out stirring to obtain a uniform slurry;pouring the slurry into a test barrel of an ultrasonic tester and enabling an ultrasonic transmitting probe and a receiving probe of the ultrasonic tester to be in contact with the slurry at the two sides the test barrel respectively; turning on an ultrasonic transmitter and an ultrasonic receiver of the ultrasonic tester, detecting changing situations of the rate or energy of the ultrasonic wavewith time during the gypsum condensation process and drawing a curve; and reading initial setting time and final setting time of the gypsum based on the changing curve of the rate or energy of the ultrasonic wave with time, and setting time corresponding to a first inflection point on the changing curve of the rate or energy of the ultrasonic wave with time as the initial setting time and time corresponding to a last inflection point as final setting time. With the provided method, the setting time of the building gypsum can be measured rapidly; and the error caused by manual operation is eliminated, so that the test result becomes accurate.

Description

technical field [0001] This application relates to but is not limited to a method for determining the setting time of building plaster. Background technique [0002] At present, the method for determining the setting time of building gypsum is mainly the Vicat instrument method, referring to GB / T17669.4-1999 "Determination of Physical Properties of Building Gypsum Powder". The test steps are: [0003] 1. Weigh the water according to the standard consistency and pour the water into the mixing bowl. Weigh 200g of gypsum sample and pour it into water within 5s. Stir with a stirring rod for 30s to obtain a uniform slurry, and pour it into the ring mold. Then raise the glass bottom plate by about 10mm, shake it up and down 5 times, scrape off the overflowing slurry with a scraper, and make the slurry flush with the upper end of the ring die. Place the ring die filled with slurry together with the glass bottom plate under the steel needle of the instrument, so that the needle ...

AI Technical Summary

Problems solved by technology

[0005] At present, there are several problems with this test method: 1. The test process is cumbersome, and the operation steps are many and complicated; 2. The test results are greatly affected by manual operation factors, and the test accuracy needs to be improved

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