Bi Modulus Columns

Techniques Bi Modulus Columns

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Bi-modulus columns, a combination of two Menard techniques

The bi-modulus column technique, developed in the early 2000s, consists in topping Controlled Modulus Columns with a compacted granular material. In 2009, Menard drew up a specification and had it approved by independent technical third party. To date, Menard has successfully carried out numerous projects using the method.

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Implementation

Controlled Modulus Columns are first installed with concrete stopping at least 1 metre above the bi-modulus interface level in order to ensure continuity. Following an initial curing period, there is a window of several hours during which the granular top is installed. It is formed by a stone column interpenetrated into the Controlled Modulus Columns head with a height of at least 50 cm over the top of the Controlled Modulus Columns.

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APPLICATIONS

Bi-modulus columns are particularly effective in cases of deep cut-off, to avoid unwanted moments in slabs on backfill or in a seismic zone. All these elements have generated exponential growth in the use of the technique since it was developed.

FAQ

How can one ensure continuity of the bi-modulus column at the interface?
Two main types of tests – loading and stripping – are carried out during the project to ensure, through visual inspection, the quality and quantity of the interface.

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