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.

Spacing of expansion joints in concrete retaining walls.

Joints in concrete walls. For cantilevered and gravity walls vertical expansion joint spacing shall be a maximum of 60 feet on centers. Joint spacing varies with amount and grade of shrink age and temperature reinforcement. 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.

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. In reinforced walls and 6m in unreinforced walls. Recommended spacing of vertical contraction joints modified from ref.

Joint spacing in meters. The engineered method is generally used only when unusual. Use projecting strips to reduce wall thickness by at least one fourth ref. The friction of the concrete is the key factor that limits the movement.

Joints are commonly spaced at distances equal to 24 to 30 times the slab thickness. Joint spacing that is greater than 15 feet require the use of load transfer devices dowels or diamond plates. Cast concrete retaining walls may be constructed with any or all of the following joints. In concrete walls the movement joints should normally be placed at a maximum spacing of 7 5m.

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. 2 wall height spacing 8 feet or less 3 times wall height. 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.

Consideration for the location of movement joints should be given at. The hight shear force is applied at the horizontal construction joints located at the lower level. 0 51 mm since water repellent coatings can effectively resist water penetration for cracks of this size. 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.

Precast concrete cantilever wall expansion joints shall be in accordance with the standard specifications section 6 11 3 3.