Experimentelle Untersuchungen zu Rückbau und Wiederverwendung von Spannbetonhohldielen.

Investigations on deconstruction and reuse of prestressed hollow core slabs Prestressed hollow core slabs as precast elements show potential for efficient reuse in terms of circularity. Within this article, the results of a research project evaluating suitability for deconstruction and reusability of prestressed hollow core slabs are shown. For this purpose, comparative experimental studies were conducted on deconstructed slabs, having been subjected to defined loads, as well as not previously loaded slabs. By erecting a sample ceiling, the prestressed hollow core slabs were loaded for 69 d. The main challenge in deconstructing the ceiling appeared to be loosening the conventionally grouted longitudinal joints between the elements without damage. Alternatively considered design variants of the joints indicate the suitability to easily improve deconstruction. In 4‐point flexural tests deconstructed as well as non‐preloaded prestressed hollow core slabs displayed a uniform pattern of failure. However, the failure of deconstructed, previously loaded hollow core slabs occurred under lower loads and with less deflection. The fact that all elements exceeded the manufacturer's specifications for bending load‐bearing capacity nevertheless supports the assumption of a high reuse potential of prestressed hollow core slabs. [ABSTRACT FROM AUTHOR]