Final answer:
Ties in concrete wall formwork are essential to hold the forms in place, maintaining their shape and integrity and preventing structural issues as the concrete cures.
Step-by-step explanation:
In concrete wall formwork, ties are important because they maintain the stability and integrity of the formwork as the concrete is being poured and while it cures. These ties hold the forms in place, preventing them from bulging or separating under the weight and pressure of the wet concrete. As concrete is a mixture of lime mortar, sand, small pebbles, and water that can be poured into molds of any shape, the role of ties becomes crucial to ensure that the resulting walls or structures adhere to the desired dimensions and specifications.
Without adequate ties, the formwork may fail, leading to structural deficiencies and possible safety hazards upon removal of the forms. Furthermore, the use of ties in concrete formwork allows for the creation of various shapes and sizes, making concrete incredibly versatile and cost-effective, as described in its usage from ancient Roman times to modern-day construction.