Evaluation of crack width formulas for reinforced concrete slabs
Proper design of concrete structures is today important to achieve cost-effective and sustainable constructions. One of the limits which needs to be meet during design is the allowable crack width diameter. This thesis focuses on presenting published literature formulas and code provisions and then utilize them on a reinforced concrete slab experiencing axial tension The thesis presents what types of cracks that can occur in concrete and their causes Background theory regarding transport mechanisms in concrete and what impact cracking have on these mechanisms are also being evaluated. How crack develops in concrete structures and what rules apply for crack width control is also important topics which are being touched upon in this thesis. In total there are 30 crack width formulas which are being presented in this thesis. Each formula has been used to calculate crack widths for a given reinforced concrete slab. It has been conducted crack width calculations for several different setups for the reinforced concrete slabs. Where four categories for discussion have been looked further into. This has provided a basis for more discussion around what consequences certain design choices have on the crack widths. The results show that there are many aspects which needs to be taken into consideration to achieve a durable reinforced concrete structure.
Vik, Jon Haugvaldstad