Crack Sensor Installation Clause Samples

Crack Sensor Installation. Each column had one coaxial cable crack sensor embedded on its back side (tension face). Normally, the sensor’s connector would extend out of the base of the column. In this case, to protect the connector from the blast, the cable was bent at the base of the column and embedded in the top of the footing as well. To do this, a ½” by ½” groove was cut along the back of the column and in the footing that extended all the way to the edge of the footing. The sensor was then placed in the groove and grouted using ▇▇▇▇▇▇ ▇▇▇▇▇▇ CW100 Precision Grout that was mixed to a dry-pack consistency. Following the first blast, a large portion of the grout was separated from the column groove due partly to the tension reflected wave generated at the back side of the column under explosion. The main reason was that since the grout was mixed to a dry-pack consistency, it did not have a sufficiently high water content to create a good bond to the base concrete. To solve this problem, all subsequent grout repairs were done by first brushing Sikatop Plus Component A bonding agent into the groove before packing the grout. This significantly improved the bond between the grout and the concrete. Finally, to protect the sensors’ connectors from the blast pressure and debris, steel plates were fabricated and attached to the footing as shown in Figure 4.4.