# Post-Tensioned Hollow-Core Concrete Slabs with Unbonded Tendons for Truck Scale Platforms: Design Assumptions and Tests

## TL;DR

Researchers designed and tested lightweight concrete slabs for truck scales using hollow cores and unbonded tendons to handle heavy loads.

## Contribution

The study introduces a novel design for truck scale platforms using post-tensioned hollow-core slabs with unbonded tendons and PVC pipes for weight reduction.

## Key findings

- The hollow-core slabs with unbonded tendons successfully supported 60-ton loads.
- Cyclic load testing showed the slabs could endure 1,000,000 cycles without significant degradation.
- Design details and test results suggest potential for further optimization of the slabs.

## Abstract

At Cracow University of Technology, attempts were made to develop national truck scale platforms with a capacity of 60 tons, made from prestressed concrete. For this work, we designed slabs partially prestressed with unbonded tendons featuring a cross-section of 1.00 × 0.28 m and a span of 5.94 m. To reduce the weight of the slabs, four channels made from commonly used ø110 × 2.2 mm PVC pipes were used. In this way, we created post-tensioned hollow-core slabs. Due to the unpredictable behavior of slabs operating in a cracked state under a repetitive load, two slabs were subjected to cyclic loads amounting to 1,000,000 cycles with different load values. This paper presents the basic design principles and design details of the slabs, as well as the methodology and results of the research conducted. Lastly, we provide appropriate conclusions directed at further optimizing the slabs.