Retaining Wall Expansion Joint In Concrete Block Wall

An information series from the national authority on concrete masonry technology ncma tek 10 2c 1 control joints for concrete masonry walls empirical method introduction concrete masonry is a popular construction material because its inherent attributes satisfy the diverse needs of both exterior and interior walls.

Retaining wall expansion joint in concrete block wall.

This temperature variation causes expansion and contraction in the structure. The main board construction for retaining walls. They may be vertical and horizontal. For cantilevered and gravity walls vertical expansion joint spacing shall be a maximum of 60 feet on centers.

The provision of movement joints depend on the lengths of walls. Expansion joints or isolation separate the sections of the walls so they can move independently and avoid pressure to move together. The simplest vertical constru c t i o n joint is formed using a bulkhead b o a r d. Construction joints in retaining walls.

Precast concrete cantilever wall expansion joints shall be in accordance with the standard specifications section 6 11 3 3. Vertical expansion joints are incorporated into the wall to account for expansion due to temperature changes. Expansion joints should be located at intervals up to 90 feet. Greased steel dowels are often cast horizontally into the wall to tie adjacent sections together.

While these attributes are the primary basis for concrete masonry s. Expansion joints are provided to allow th. S t r uction joint restricts wall move ments and should be as strong as the wall without joints. Expansion joints are provided in every large structure which is subjected to high variation in temperature during its lifetime.

Or possibly where joining new to existing retaining walls also require weep holes at the base of the wall to prevent water pressure building up behind the wall. Details of this butt type con s t r uction joint are shown in figure 4. As a rule of thumb it is normal to consider movement joints at approximately 6 m centres in straight lengths of autoclaved aerated concrete block walls. The inclusion of full panel height openings and or the inclusion of bed joint reinforcement can assist in lowering the risk of un planned cracking.

These joints may be filled with flexible joint fillers.