At the Krasnoyarsk hydroelectric plant, during construction of the concrete dam, double grouting of several test-construction outlines of contrac~on-shrinkage joints was carried out [i]. To evaluate the quality of the groutLug, controlholes were drilled* (Fig. 1), cores were removed from the zone of intersection with the joints, and hydraulic tests were performed. A total of 212 m of holes was drilled. During the drilling process it was found that the actual number of intersections with joints (44) amounts to 6890 of the design number (6190 in the construction outlines). This was due to the presence, in certain zones, of heavily shattered cores which made it difficult to establish the point of intersection of the hole with the joint, or to locate the toothing on the opposite side of the joint (with respect to the design).The nature of the core rupture depends on the relation between the strengths of the cement stone filling the joint and of the adjoining concrete, and the bond along the contact surfaces of these materials. In the test outlines, 12 cores were monolithic, 26 failed along the joint, and the remaining cores were shattered. As a rule, all three types of core are ex~acted from any given outline, since the conditions governing the formation and hardening of cement stone over the area of even a single outline are dissimilar.From the results of the core inspections, three characteristic types of concrete surfaces in the joints may be established (Table 1).
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