The Blaine Air Permeability Apparatus determines the fineness of Portland cement in terms of specific surface area expressed as the total surface area in square centimeters per gram of mortar or cement. The Blaine works by drawing a definite quantity of air through of bed of cement exhibiting a definitive porosity value. The number and size of the pores in a prepared bed of definite porosity is a function of the size of the particles and determines the rate of airflow through the bed. This procedure is outlined in ASTM C204, Method A and AASHTO T153.
The 洪堡 Blaine Air Permeability Apparatus consists of: calibrated U-tube manometer, 磨砂玻璃接头, stainless steel test cell and plunger, rubber aspirator bulb and perforated disc. 包括8盎司(226.8g) bottle of red manometer fluid, 滤纸, wood block for holding test cell during filling and a funnel. Mounted on finished wood panel with rubber-footed base.
To perform this test, NIST Portland 水泥 #114R is required by the ASTM standard for calibration. See 配件 H-3817 and H-3817.20.
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