Spacing Of Expansion Joints In Concrete Retaining Walls

The friction of the concrete is the key factor that limits the movement.

Spacing of expansion joints in concrete retaining walls.

Joints in poured walls by kim basham and bruce suprenant effective methods for controlling unsightly wall cracking f i g u r e 1. In concrete walls the movement joints should normally be placed at a maximum spacing of 7 5m. These are vertical or horizontal joints that are used between two successive pours of concrete keys are used to increase the shear resistance at the joint. 0 51 mm since water repellent coatings can effectively resist water penetration for cracks of this size.

The hight shear force is applied at the horizontal construction joints located at the lower level. Joint spacing varies with amount and grade of shrink age and temperature reinforcement. Use projecting strips to reduce wall thickness by at least one fourth ref. Expansion joints should normally be provided at a spacing of not more than 30m between successive expansion joints or between the end of the structure and the next expansion joint.

Joint spacing that is greater than 15 feet require the use of load transfer devices dowels or diamond plates. Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness. An engineered method is presented in tek 10 3 control joints for concrete masonry walls alternative engineered method which is based on limiting crack width to 0 02 in. In reinforced walls and 6m in unreinforced walls.

Joint spacing in feet contraction joints may be tooled into the concrete surface at the time of placement. There is a special check to be done at the construction joints when larger retaining walls or structures having very high lateral loads are designed. Author spacing lewerenz 1907 75 ft 23 m for walls. Table 1 2 expansion joint spacings.

Joint spacing in meters. Precast concrete cantilever wall expansion joints shall be in accordance with the standard specifications section 6 11 3 3. Joints in concrete walls. 2 wall height spacing 8 feet or less 3 times wall height.

Change in wall height or thickness see figure 1 figure 2 change of loading see figure 3 abutments of walls and columns see figure 4 junctions of dissimiliar materials see figure 5 movement joints in concrete floor slabs see figure 6. The engineered method is generally used only when unusual. Consideration for the location of movement joints should be given at. Aci 224r 92 one to three times the height of the wall in solid walls.

Hunter 1953 80 ft 25 m for walls and insulated roofs 30 to 40 ft 9 to 12 m for.