Test Methods

The water penetration test method is summarized in Fig. 9. The quantity of water deposition on the surface of the specimen and the air pressure difference across it was controlled according to the prescribed parameters as provided in Table 6 for tests on vertical joints, and Table 7 for those on horizontal joints. Testing undertaken at 4.0 L/(min-m2) was consistent with the requirements of the Japanese Institute of Standards A 1414-1[22] [13] whereas those completed at 3.4 L/(min-m2) replicated conditions specified in the ASTM E331-00[23]. Testing at the other two spray rates (i. e., 1.6 and 6 L/(min-m2)) permitted subjecting the crack opening to a broader range of water deposition rates perhaps consis­tent with that found on the exterior of tall buildings.

The rate of water deposition (L/(min-m2)), pressure differential (Pa), and rate of water leakage (L/min) was recorded automatically by the data acquisi­tion system. The behavior of water leakage was verified by visual observation, as depicted in Fig. 9. Figure 9 provides a horizontal sectional view of the verti­cal joint test specimen at the crack location. Transparent acrylic plates were used to form the panel face, and the face and sides of the joint, thus permitting observation of water entry at the crack location. The eye icon in Fig. 9 indicates the position of the observer in relation to that of the crack location in the vertical joint.

The back of the specimen was sealed with an adhesive tape (Fig. 9) permit-

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FIG. 9—Horizontal sectional view of the vertical joint test specimen at crack location; the eye icon indicates the position of the observer in relation to that of the crack location.

ting control of pressure differences across the joint. The joint strain to the prescribed displacement was adjusted with a clamp. Tests were carried out over a period of ten minutes for each test parameter.

Results from Laboratory Tests on Sealed Vertical Joints