Building in Existing Structures – Potentials through the Use of WPE-DK UHPC

Building in existing structures encompasses all construction measures on existing buildings or infrastructures – from renovation and modernization to conversions, extensions, and maintenance. The aim is to preserve the existing building fabric, adapt it to new requirements, and at the same time conserve resources. This approach is becoming increasingly important, especially in urban areas – both from an ecological and an economic perspective.

 

"Building in existing structures" includes all types of construction work on already existing buildings or structures. These measures include:

• Renovation (repairing damage or defects)

• Modernization (upgrading to current technical or energy standards)

• Conversion (changing the use or layout of spaces)

• Extension (e.g., annexes, additional floors)

• Maintenance (ongoing upkeep to preserve condition)

• Heritage-appropriate renewal (in historic or listed buildings)

Objectives of Building in Existing Structures

• Preservation and reuse of existing building fabric

• Conservation of resources compared to demolition and new construction

• Reduction of CO₂ emissions through reuse of materials

• Adaptation to new standards, e.g., accessibility, energy efficiency, fire protection

• Urban densification and upgrading of neighborhoods

Challenges

• Unpredictable condition of existing structures

• Limitations due to heritage protection laws

• Technical complexity when integrating new systems into old structures

• Cost and time risks due to unexpected findings during construction

Building in existing structures is especially relevant in today’s construction practice, as it contributes to sustainability, supports urban densification, and preserves cultural heritage.

Advantages of WPE-DK UHPC in Existing Structures

1. High strength with minimal cross-sections
   Ideal for strengthening or retrofitting where space is limited (e.g., ceilings, columns, bridge decks).
   Enables slender additions without major intervention in the existing structure.

2. Durability and corrosion resistance
   WPE-DK UHPC is extremely resistant to frost, de-icing salts, chemical attacks, and carbonation – especially beneficial in the renovation of water- or salt-exposed elements (e.g., underground garages, bridges).

3. Bonding with existing concrete
   Excellent adhesion to old concrete allows for efficient reinforcement techniques (e.g., overlays, concrete jacketing).

4. High load-bearing capacity
   Retrofitting of load-bearing elements (e.g., columns, beams) with significantly less material compared to conventional or reinforced concrete.

5. Fast construction methods
   Prefabricated WPE-DK UHPC elements can be quickly installed – e.g., for facade replacements, balcony slabs, or bridge girders.

6. Architectural freedom
   Especially in architecturally valuable buildings, WPE-DK UHPC allows for very precise, detailed, and high-quality additions or reconstructions.

 

Typical Applications in Existing Structures

• Strengthening of ceilings, beams, and columns

• Rehabilitation of bridges and traffic surfaces

• Additions and vertical extensions

• Façade or balcony reinforcement

• Fire or explosion protection measures

• Heritage-compatible structural upgrades (with minimally invasive methods)

   

WPE-DK UHPC is a highly capable material for building in existing structures. It offers a sustainable, durable, and often economically viable solution – particularly for technically or architecturally demanding renovation projects.

 

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ber@wpe-dk.dk