KGN

Introduction to Void
Post-Tensioning

Waffle post-tensioning is a reinforced concrete slab system
featuring a grid-like pattern of ribs, designed to optimize strength
and efficiency. Post-tensioning cables embedded within the slab
enhance load-bearing capacity, minimize cracking, and allow for
longer spans with fewer support columns. This method reduces
material usage while maintaining structural integrity, making it
ideal for commercial buildings, parking structures, and large
residential projects.

Key Characteristics of Waffle Post-
Tensioning:

Enhanced Structural Efficiency:

Combines strength with material savings, improving overall construction performance.

Reduced Slab Thickness:

Minimizes concrete usage while maintaining durability and load-bearing capacity.

Longer Spans & Fewer Columns:

Increases open space for flexible design and architectural creativity.

Design & Engineering of
Void Post-Tensioning

Waffle post-tensioning follows a structured process to maximize strength and efficiency. Formwork
creates a ribbed pattern, tendons are placed, and concrete is poured and cured. After tensioning the
tendons, the formwork is removed, leaving a durable, lightweight slab with enhanced load capacity
and minimal cracking.

Placement of Waffle Formwork to Create Ribbed Slab Patterns

Laying of Post-Tensioning Tendons Along the Ribs

Pouring and Curing of Concrete to Achieve Required Strength

Applying Tension to Tendons Using Hydraulic Jacks

Removing Formwork to Reveal a Strong and Lightweight Waffle Slab

Design & Engineering of
Void Post-Tensioning

Placement of Waffle Formwork to Create Ribbed Slab Patterns

Laying of Post-Tensioning Tendons Along the Ribs

Pouring and Curing of Concrete to Achieve Required Strength

Applying Tension to Tendons Using Hydraulic Jacks

Removing Formwork to Reveal a Strong and Lightweight Waffle Slab

Advantages of Void
Post-Tensioning

Waffle post-tensioning enhances load-bearing capacity,
reduces material usage, and minimizes cracks. Its
lightweight design allows for longer spans with fewer
columns, making it a cost-effective and durable solution
for commercial buildings, parking structures, and
industrial projects. This method also improves
construction efficiency by reducing the need for
extensive formwork and materials.

Applications of
Void Post-Tensioning

Research Laboratories &
Data Centers

Hospitals &
Healthcare Facilities

Airports &
Transportation Hubs

Shopping Malls &
Retail Centers