Project Details
Projekt
Research into the load bearing behaviour of light construction concrete slabs made by using Cross-Channel-Technology
Applicant
Professor Dr.-Ing. Wolfram Jäger
Subject Area
Structural Engineering, Building Informatics and Construction Operation
Term
from 2014 to 2019
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 257052528
The CC-technology is an approach to producing structural geometric shaped plates made of wood, which in construction product are known as Tubular chipboard or Hollow Core Chipboard. The name of CC technology comes from cross-channel technology and describes the geometric inner cross channels at regular intervals in the plate. This systematic cavities lead to significant weight reduction when compared to solid plates having the same thickness. Because of especial geometry, the production is done by assembling the halves of plate. The intersecting contact surface is formed by regularly repeating half-channels, therefore , the two halves can be jointed to each other by projection of one connector, called the "humps" on one half into a matching groove on the next half. The Idea of transmission this technology to producing concrete panels has enormous potential for example this method can be implemented for production of light walls, ceiling and facade elements made of concrete. The aim of this research is the methodical study on the load carrying capacity of CC plates of fine concrete (cement and sand, no gravel) as normal construction product such as ceilings and wall panels. Also classification of the CC plate can be introduced, for example similar to the terms which are introduced by Ortlepp for textile-reinforced concrete, in which L stands for "hole dimension" k_eff is factor from the ratio of hole area, of the symmetry of section (A_L) and gross area (A_b). The main focus is turned to use of fine concrete (e.g. Pagel TF-10 TUDALIT) for the production facade panels of about 8 cm thickness (in case of ceiling and wall panels thickness of about 20 cm normal reinforced concrete is to be used). Since the basic behavior of CC plates is not known yet, the processes should be described with an appropriate bearing and failure model. Currently sufficient information for the basic structural behavior does not exist; therefore numerical simulation itself is not enough to represent the complexity of effects in the composite materials. In addition to theoretical studies, an extensive experimental test program is planned to calibrate the calculation models by investigating the behavior of small-scale specimens under static load. In experimental part of research different CC plates, with and without reinforcement with varying in shape (e.g. with and without openings) and thicknesses should be tested. The final analytical model could be approved after independent full-scale tests on CC plates under combination of loads.
DFG Programme
Priority Programmes
