High-strength and ultra-high performance concretes

Improvement of the rheological behavior

At present, high-strength and ultra-high performance concretes gain more and more in importance across the world. They are characterized by an optimized packing of the particles as well as by extremely low water/cement ratios of < 0.25. The addition of polycarboxylate superplasticizers to concretes with such low water content at best results in very sticky, creeping concretes and often the PCEs even fail completely.

It will be shown in the lecture that a combination of common PCE superplasticizers and simple, non-ionic molecules achieves concretes with very good flow characteristics at...

Related articles:

Issue 2020-02 Robustness of reinforced concrete columns

Enhanced design rules on compression members using high-strength and ultra-high performance concretes

The robust design of supporting structures is the basis for every structural design. Damages caused by unplanned loads must be limited to a reasonable extent in order to prevent abrupt failure or...

more
Issue 2015-02 New findings and calculation methods

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

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...

more
Issue 2015-02 Optimizing sedimentation resistance

Robustness of SCC on par with vibrated concrete

The use of self-compacting concrete (SCC) has not yet become as widespread in Europe as originally hoped despite its numerous concrete technology benefits in terms of workability and product quality....

more
Issue 2021-02

Estimation of fresh concrete behavior on the basis of the concrete composition

Normally, the fresh concrete properties are specified in the planning stage of building structures – generally, these are just the exposure classes and strength classes. Then the consistency class...

more
Issue 2011-04 Study on polypropylene fiber reinforced mortars and concretes

Rheological properties of fresh polypropylene fiber reinforced mortar and concrete

The first step of the experimental activity was to identify the rheological behavior of PFRFM and PFRFC, which was completed using experimental flow curves and applying adequate models and equations....

more