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Fluids
Published in Daniel H. Nichols, Physics for Technology, 2019
Capillary action is the action of fluids rising up through narrow tubes and is the reason why some paper towels are so absorbent. Capillary action arises from the adhesion between the fluid and the wall of the tube. Fluid will rise upward against the force of gravity until a balance is struck between adhesion, cohesion, and gravity (Figure 8.6).
Resilient modulus–moisture content relationships for pavement engineering applications
Published in International Journal of Pavement Engineering, 2018
The procedure proposed by Khoury and Zaman (2004) used in this study consists of the following steps: (a) placing a rubber membrane around the specimen after compaction, (b) placing a circular plastic sheet on each end of the specimen, (c) placing two platens on the top of the plastic sheet, (d) sealing off the membrane from the platens with masking tape, (e) placing the specimen in an oven at 41 °C (105°F) for 24 h, (f) removing the specimen from the oven and placing it at room temperature for 30 min, (g) removing the membrane and then weighing the specimen, (h) wiping the membrane with a paper towel to remove any moisture on the membrane, (i) then replacing the membrane around the specimen and sealing off the membrane from the platens with masking tape, (j) placing the specimen (turned upside down) back in the oven, (k) repeating steps (a) through (j) until a target weight is achieved (i.e. target moisture content). After the MR testing each specimen was divided into 25 pieces to determine the moisture content radially and vertically, as proposed by Khoury and Zaman (2004). Findings from this study revealed that the average drying rate was 6 grams of moisture per day and the moisture distribution throughout the radius and depth was within 0.5%. As a result, the moisture content of the bulk specimens was used in establishing the MR–moisture content (MRMC) relationships for specimens.