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Award of Excellence: Industrial Category

Rehabilitation of Grain Storage Silos for Kellogg
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Querétaro, Qro., Mexico

Submitted by BASF Corporation


Kellogg Grain Storage Silos

Owner
Kellogg de Mexico
Querétaro, Qro., Mexico

Project Engineer/
Designer

Fabricio Rosales, Struct. Eng. Consultant
Querétaro, Qro., Mexico

Repair Contractor
Recubrimientos de Proteccion S.A. de C.V.
Mexico, DF

Material Supplier/
Manufacturer

BASF Mexicana
Mexico, DF

The structures are located in Querétaro City in the central region of Mexico. The project consisted of the rehabilitation of two grain storage batteries similar in dimensional parameters but different in the number of silos, date of construction, and in some of the pathologies identified.

The first battery consists of four main silos and three inter-silos, attached to a service tower that houses mechanical equipment required for the silos’ operation. This structure was built around 1970; the height of the units is 115 ft (35 m). The second battery consists of eight main silos and five inter-silos that are also attached to a service tower. This unit was built in 1980, and the dimensions of silos and height of the structure are the same as those of the older battery.

A number of repair methods were implemented to strengthen the structures, including an active post-tensioning system. Structural integrity was restored to the concrete by epoxy resin injection of cracks and concrete patching of some construction joints. Structural section restoration and strengthening of walls in all of the main silos with an improved resistance to abrasion were achieved in the interior surface of the walls by the installation of an FDA-approved epoxy lining reinforced with glass cloth. Carbon fiber-reinforced polymer (CFRP) strengthening was used in the hopper beams, and columns to provide increased resistance to shear and torsion. Other protective measures included a carbon dioxide diffusion barrier system applied on the exterior. 

The use of both state-of-the-art materials and technologies to restore and structurally strengthen the walls of the silos allowed the owner to confidently use and operate a number of units that had been unused because of their defects. The final repairs allow natural self-cleaning of the walls with considerably lower maintenance costs.

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