New findings and calculation methods

Creeping and shrinking of ultra-high performance concrete (UHPC)

→ 1 Shrinkage deformation of an UHPC (measured values) and of a C30/37 (prediction according to EC2). Ambient atmosphere: 65 % r. h., 20 °C; start of curing ts = 1 d; cylindrical specimens, d/h = 100/300 mm Figure: Müller
→ 1 Shrinkage deformation of an UHPC (measured values) and of a C30/37 (prediction according to EC2). Ambient atmosphere: 65 % r. h., 20 °C; start of curing ts = 1 d; cylindrical specimens, d/h = 100/300 mm
Figure: Müller
→ 2 Creep coefficient for an UHPC (measured data) and of a C30/37 (prediction according to EC2) depending on the age at loading t0 = 3 and 28 days. Ambient atmosphere: 65 % r. h., 20 °C; load level = 0.3; cylindrical specimens, d/h = 100/300 mm Figure: Müller
→ 2 Creep coefficient for an UHPC (measured data) and of a C30/37 (prediction according to EC2) depending on the age at loading t0 = 3 and 28 days. Ambient atmosphere: 65 % r. h., 20 °C; load level = 0.3; cylindrical specimens, d/h = 100/300 mm
Figure: Müller

Due to their high strength and durability, ultra-high performance concretes allow realizing particularly exposed building structures. The fact that despite its dense microstructure UHPC is subject pronounced to time- and load-dependent deformations has to be considered in static and structural design. These deformations were thoroughly investigated within the scope of a comprehensive DFG research project [1]. However, this paper can only present a summary of just a few findings obtained in the investigations carried out on two different types of ultra-high performance concrete. The...

Find out more in

BFT 02/2015

Find out more in

BFT 02/2015

Ressort:  PANEL 5 | PODIUM 5
subscription Content

Related articles:

Issue 02/2014 Causes and control

Shrinkage and cracking in high-performance concretes –

Introduction The problem of load-independent cracking in concrete members is as old as the construction method itself. Cracking is primarily caused by thermal, hygric and chemical processes as well as...

more
Issue 10/2009 Precast columns

New possibilities of concrete technology

Columns for high-rise buildings which have high demands on the architectural perception (Fig. 1) are often constructed as composite steel columns. This construction method enables the design of...

more
Issue 02/2013 Research for new markets

High-performance concretes

High-performance concrete as a challenge Ultra-high performance concretes (UHPCs) are building materials with an extremely dense matrix whose properties are very similar to those of steel. Factors...

more
Issue 02/2018 Limestone-based green cements

Predicting concrete shrink-behavior

The cement industry generates about 6% of global CO2 emissions that are primarily caused by the production of Portland cement clinker. A reduction in the clinker content of cement and concrete and its...

more
Issue 05/2024

Flexural design of ultra-high-performance fiber-reinforced concrete girders

In [1], an approach for determining the moment resistance of ultra-high-performance concrete (UHPC) girders with mixed reinforcement is presented. This approach considers the contribution of the steel...

more