Influence of Humidity on the Nanostructure of the Cement Paste

Movement Inside the Concrete

 Despite being the most popular building material worldwide, concrete is still not fully understood with respect to its physico-chemical and mechanical characteristics. Such an understanding becomes all the more important as both key safety parameters (such as tensile strength and resistance to earthquakes and strong winds) and the requirements in terms of durability and low environmental impact are continuously gaining in significance. Repair costs alone are so high that they are of relevance to the entire economy.

In the case of concrete, the length range of interest to researchers reaches from several kilometers to less than a nanometer in the microstructure. Concrete structures are often exposed to extreme environmental conditions. The microstructure of the cement paste (i.e. the binder contained in the concrete) determines almost all properties of the material. This cement paste forms a nanoporous system that is mainly composed of calcium silicate hydrates [1, 2] with nanopores with a radius of approx. 2 nm that are also contained in ultra-high performance concrete [3]. In standard concretes,...

Related articles:

Issue 02/2017 New findings and forecast models

Freeze-thaw attack and damage

The freeze-thaw damage pattern of concrete is primarily linked to the water contained in the pore system, which is also referred to as the saturation level. If a certain critical saturation level is...

Issue 02/2015 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....

Issue 10/2011 Repairing subsurface infrastructure

Mortar ombran MHP tested

Designing the high-tech mortar ombran MHP, MC-Bauchemie GmbH has a product, which is able to solve even difficult problems with innovative features when it comes to repairing of subsurface...

Issue 02/2018 CO2 absorption of concrete

Re-evaluation of life cycle assessments for concrete pro­ducts?

Carbonation is the physical and chemical reaction between CO2 and hardened cement paste in the presence of pore water, and in this process carbon from the atmosphere is sequestered. The authors of an...

Issue 06/2014 Fabrino

Surface protection with strong water repellency

With the market launch of Sicorol Pearl, Fabrino based in the German city of Memmingen provides a new surface protection for concrete. The name gives it away: Sicorol Pearl is characterized by its...