RCC – Reduced Carbon Concrete: Implementation of CO2-redudes concrete in construction sites

The objectives of the present project "RCC - Reduced Carbon Concrete" are to test the current knowledge about the temperature-dependent curing processes of performance concretes by concrete work on large components on the construction site, under summer and winter conditions, and in precast production. The results will be incorporated into construction practice and standardization work.

Short Description

Starting point / motivation

Across Europe, efforts to decarbonize the construction industry are linked to the greening of one of the most important building material: Concrete. The approach to CO2 reduction in concrete is in the area of conflict with the valid concrete standard ÖNORM B 4710-1, which represents the implementation of EN 206. Among other things, this standard requires a minimum binder content in concrete formulations as proof of performance. Alternatively, if the minimum binder content is deviated from, it is permissible to provide evidence of equivalent concrete performance. This requires appropriate concrete technology know-how. There is currently a lack of practical experience in large construction projects. This project is intended to close this gap.

Contents and goals

The object of research is the use of RCC concrete formulations with clinker- (=CO2-) reduced cement and thus a component-specific reduction of approx. 30 % CO2 equivalents. The focus on the innovation of the equivalence proof of performance concretes opens a future field.

The research project is to

  • detail the tests conducted during the preliminary project to document the technical concrete properties. The concept includes testing and evaluation of durability and stability with regard to hardened concrete properties as well as creep and shrinkage. The testing concept provides for comparative tests with specimens of standard concrete according to the descriptive approach at different ambient temperatures.
  • research the technical properties in on-site applications of concrete components (walls, slabs, columns, etc.) to determine the extent to which there are deviations between laboratory test results and those in on-site use,
  • Research applications for precast concrete components. Precast components are manufactured under controlled factory conditions (indoors) and will be researched in addition to in-situ concrete applications.

Methods

Three to four ceiling and wall elements are produced on site for the summer and winter concrete work, which differ in terms of component thickness, reinforcement, openings, etc., in order to gain broad experience. Furthermore, the influence of the curing (application of fleeces, evaporation protection, etc.) will be investigated.

Expected results

The RCC research project provides for the first time real data on the technical properties of RCC concrete in the summer and winter cases. From this, it is possible to derive additional costs for both cases due to curing, extension of construction time, larger stockpiles of formwork or working time. In this way, the current additional costs can be estimated and the construction schedule can be adjusted accordingly. The findings can also be used to identify any new research requirements.

Project Partners

Project management

  • Strabag Real Estate GmbH

Project or cooperation partners

  • bauXund forschung und beratung gmbh
  • Dr. Ronald Mischek ZT GmbH
  • forschen planen bauen DI Thomas Romm ZT
  • Materialprüfanstalt Hartl GmbH
  • STRABAG SE
  • SV Dr. Johannes Horvath
  • Wopfinger Transportbeton GmbH

Contact Address

DI Lukasz Kujawa
Donau-City-Straße 1, A 1220 Wien, Austria
Tel.: +43 1 22422-7205
Email: lukasz.kujawa@strabag.com
www.strabag-real-estate.at