Monolithic concrete wall expansion joint system

A concrete wall structure expansion joint system in a wall, the system comprising:

• a first concrete wall component defining an upper surface;
• a second concrete wall component defining an upper surface;
• and
• a joint for mitigating against crack formation in the first and second concrete wall components, the joint comprising a rigid plate disposed between the first and second concrete wall components.

A method for forming a concrete wall structure expansion joint in a wall, the method comprising:

• building first and second concrete wall forms for first and second concrete wall components, respectively;
• building a joint between the first and second wall forms, the building the joint step comprising the step of:
• disposing a rigid plate between the first and second concrete wall forms, the rigid plate defining an upper edge;
• pouring concrete into the first and second concrete forms to form the first and second concrete wall components;
• forming an upper groove between the upper surfaces of the first and second concrete wall components and above the upper edge of the rigid plate;
• curing the concrete to form the wall;
• removing the first and second concrete wall forms.