Expansion Joints

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Expansion Joint

 

An expansion joint must not be confused with a control joint. The difference being that a control joint is a break or a cut in either the vertical or horizontal surface to prevent tensile stress developing across that joint. Control joints are generally filled with sand, mortar, grout or silicone.

An expansion joint is a specific movement profile that bridges the gap between 2 meeting surfaces to provide a suppression joint that prevents surface compression cracking and to bridge movement gaps. Expansion joints are designed to accommodate thermal, moisture and surface, substrate or foundation movement variations such as expansion, contraction, floating and many other causes of movement. Hidden expansion profiles and surface expansion profiles are specifically engineered for the complex range of gap size, movement size, movement direction and load/use type.

Surface expansion profiles are visible and must be both correctly suited to traffic use as well as visually appealing. Then consideration must also be made to determine if the expansion joint should accommodate lateral movement, horizontal movement, vertical movement or combinations of all.

Unfortunately all too often, the wrong expansion joint is specified or used for incorrect application which can and has resulted in massive rectification costs. Two main factors determine the effectiveness of expansion joints.

  1. Expansion Joint Selection
  2. Expansion Joint Installation

Below is an example of both factors resulting in failure….

Surface inspection clearly shows expansion joint failure. Subsurface reveals incorrect installation of the expansion joint.

Expansion Joint

Expansion Joint Singapore

Expansion Joints

Below is the positive result when the correct expansion joint is selected and correct expansion joint installation procedures are followed.

Expansion Joints Singapore

Expansion Joints Singapore

Expansion Joint

It is quite obvious the importance of expansion joint selection and the methodology require for its effective installation. Expansion joints are specified by architects, engineers and/or designers or industry body specialists.

The amazing variety of simple to complex expansion joints is quite mind boggling and is unquestionably a specialised science.

Waterstop Systems

 

Concrete structures are only as watertight as the Waterstop Systems that join them. In most concrete structures and elements, a particular type of joint (construction, contraction, control, expansion or isolation) will be designed in them for a number of varied structural design reasons, and due to this joint, it may need to be water stopped as the structure is water retaining or water excluding.

Waterstop Systems are very important and are usually required for most projects. There are many types of Waterstop Systems to be considered for use, and a very specific type may need to be used for the joint that has to be water stopped.

We have a wide and varied number of Waterstop Systems available for use, for many different types of construction segments.

Contact us if assistance is required in choosing the correct type of Waterstop System for your structures joints.

 

Joint Sealants & Joint Seals

 

In structures and elements where joints have been placed in them, a Joint Sealant or Joint Seal is usually required to prevent or seal the joint against the entry of foreign matter or water into or out of the structure, and at the same time they must be able to withstand the associated movements of the joint and/or the loading pressures being applied.

The Joint Sealant or Joint Seal may also need to be able to withstand exposure to UV, be able to withstand submersion in water or salt water or even have to have resistance to fire or certain chemical or hydrocarbon solutions.

We have many different types of Joint Sealants and Joint Seals available for use, and depending upon the type of joint designed, the type of structure and the type of exposure that they could be subject to, determines the type to be used.

Contact us if assistance is required in choosing the correct type of Joint Sealant or Joint Seal for your structures joints.

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