A solid concrete structure may probably fail if gaps are not properly bridged and protected. When the concrete structure serves as a containment vessel of fluids, leakage must be prevented or reduced depending upon the usage and purpose. Therefore, crack width control forms an important aspect in many reinforced concrete structures.
Plain Concrete
In case of plain具体的，聚集锁定有助于桥接。当混凝土注入纤维时，会发生进一步的桥接作用，从而叠加在骨架桥接效果上。在纤维增强的混凝土（FRC）中，这种联合的桥接作用在改善裂缝中携带的应力方面有利。测试其有效性非常重要。
破解桥接测试
One can easily perform the test on a Tinius Olsen 50K-T tension compression testing machine (Figure 1) utilizing a four point bend test grip called QS4531 grip. The test is performed on a reinforced concrete sample 200 x 300mm to EN1062-72004 Annex C.
Figure 1.Compression testing
如图2所示，一旦制备了测试样品并将其放置在弯曲测试设备中，就将施加恒定力弯曲测试样品，直到在混凝土表面的暴露侧面形成裂缝。裂缝将发生在混凝土的两侧，位于水密材料的边界附近。该裂纹的宽度分别为0.4、0.75和1.5mm。
Figure 2.弯曲测试设备的图
When the crack is fixed on the substrate and no perforation occurs in the watertight covering after a period of 24h, it is assumed that the test has been successfully passed.
Conclusion
The Tinius Olsen 50K-T tension compression testing machine is designed to test a range of reinforced concrete structures as well as materials like metals, plastics, rubber, etc., in compression, tension, shear or flexure.
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