First, the product introduction:
Gypsum water retention rate measuring instrument is a professional testing instrument. It is used to test the water retention rate of plastering plaster according to the national building materials industry standard "Stucco Plaster" (JC/T517-2004). It can also be used for cement and mortar. Water retention rate test.
Second, technical parameters:
♦ Buchner funnel, inner diameter 150mm, depth 65mml, aperture 2mm, number of holes 169.
♦ Shockproof vacuum gauge 0 to 0.1MPa
♦ Vacuum pump negative pressure up to 0.1MPa
♦T-type scraper, made of hard wear-resistant material with a thickness of 1mm.
♦ Pumping filter bottle 5000ml.
♦ Power supply voltage: 220V 50Hz.
♦ Dimensions: 700 × 400 × 600mm
♦ Power: 200W
♦ Net weight: 30Kg
Third, the experimental steps:
A. Cut a medium-speed qualitative filter paper according to the inner diameter of the cloth funnel, spread it on the bottom of the funnel, and filter the filter paper and filter paper with water. Place the cloth funnel on the suction filter bottle, turn on the vacuum pump, filter for one minute, remove the cloth funnel, and wipe the water from the remaining supplier of Shanghai Rongjida Experimental Instrument Co., Ltd. with the filter paper (G1). ), accurate to 0.1 grams.
B. Gypsum slurry with standard diffusion water consumption is placed in the weighing cloth funnel, and the T-shaped scraper is vertically rotated and scraped in the funnel to keep the slurry thickness within the range of (10±0.5) mm. The residual gypsum slurry on the inner wall of the cloth funnel is wiped and weighed (G2) to the nearest 0.1 gram. The time interval from the completion of the agitation to the completion of the weighing should not exceed 5 minutes.
C. Place the weighed cloth funnel on the suction filter bottle and start the vacuum pump. The negative pressure was adjusted to (53.33±0.67) kpa within 30 seconds. After suction filtration for 20 minutes, the funnel was taken out, and the residual water of the lower mouth was wiped clean with a filter paper, and weighed (G3) with an accuracy of 0.1 g.
If the difference between the water retention rate measured twice and its average value is not more than 3%, the average value is taken as the water retention rate of the test, otherwise the test should be repeated.
Fourth, the product structure:
Gypsum mortar water retention rate measuring instrument is mainly composed of rotary vane vacuum pump, shockproof vacuum gauge, suction filter bottle, Buchner funnel, etc. The control system is convenient, flexible and easy to operate. The layout of the whole machine is reasonable and the level is clear. It is suitable for quality inspection departments at all levels. And the use of the user.