True concrete recycling

Electrodynamic fragmentation –

Worldwide, concrete is second only to water in terms of its quantities used: each year, approx. 10 billion tonnes of concrete are required. More than 900 million tonnes of old concrete from demolition or renovation are generated per year in Europe, the United States and Japan. For political and environmental reasons, the re-use of old concrete is becoming increasingly important amidst the ever greater scarcity of landfill capacity, the extraction of natural raw materials for cement production (e.g. lime, gravel or clay), the associated high CO2 emissions and applicable legislation providing...

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Issue 04/2013 Fraunhofer Institute for Building Physics IBP

May lightning strike!

Several millions of tons of construction waste are produced every year in Germany. A considerable proportion of this is attributed to concrete – probably the most often used building material of the...

Issue 05/2024

Concrete with processed waste-incineration ash

In Germany, around 5.7 million tons of municipal incinerator bottom ash (HMVA) are discharged annually. For reasons of sustainability, it is the goal of the ASHCON project, funded by the German...

Issue 04/2013

Opportunities and limitations of concrete recycling

Concrete is the most commonly used construction material worldwide. When considering the cement quantities manufactured in Germany since 1950 for determining the produced concrete volumes and...

Issue 02/2021

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...

Issue 03/2011 Properties of fresh and hardened concrete

SCC with crushed aggregate

The fresh concrete properties of self-compacting concretes (SCC) are considerably influenced by the choice of coarse aggregate. The principal parameters are in this context the quantitative content of...