Does it make sense to think about ­extending the design lifetime of ­deteriorating concrete structures?

This question might be best answered by means of an example of two reinforced concrete pre-heater towers, one is located in Europe and the other one in Asia. These cases may at first seem to be special however similarities to plants wordwide can be found and may be of interest for many cement producers. This article will share the experience of Scherr + Klimke AG gained through the inspections of main production buildings of several cement plants from the structural point of view such as crusher and mill buildings, pre-heater towers, silos, kiln supports, cooler buildings, packing plants etc.

1 Presentation of the subject

In general reinforced concrete production buildings should have a design lifetime of 50 years. This means with regular maintenance the construction should sustain its structural integrity throughout this period without showing severe deterioration. However, in cement plants with heavy duty operation and frequent times changing of equipment loading during the years, the buildings suffer greatly and often show serious damages by the end of their design lifetime. This can be observed in many plants built in the 1960s and -70s (Fig. 1 and Fig. 2). The owner often sees...

Related articles:

Issue 2014-10 SCHERR+KLIMKE AG

Cracks in silo walls

1 Introduction In general silos are structurally delicate structures. They consist of shell elements and can carry membrane tension or compression forces very well. However any bending moments or...


Geda industrial lifts at the Märker ­cement works in Harburg

The lift travels almost 70 m up the preheater tower and the multi-chamber silo of the cement works. However, the Märker employees can only enjoy the beautiful view over the Danube-Ries ­region for a...

Issue 2021-5 WO 2021/006155 A1

Sludge processing method and cement manufacturing system

(22) 01.07.2020 (43) 14.01.2021 (57) This cement manufacturing system comprises: a suspension pre-heater for pre-heating a cement raw material; a calcining furnace for calcining the pre-heated cement...

Issue 2015-9 US 2015/0183686 A1

Method and system for producing cement clinker from raw ­cement mixture

(22) 02.07.2013 (43) 02.07.2015 (57) The invention relates to a method and a system for producing cement clinker from raw cement mixture, wherein one part of the raw cement mixture is preheated in a...

Issue 2020-5-6 WO 2020/044288 A1

A method and apparatus for reduction of HCI emission from cement plants using cement raw meal as absorber

(22) 29.08.2019 (43) 05.03.2020 (57) The invention relates to a method for reduction of HC1 emission from a cement plant based on a treatment of a preheater (1) and/or bypass gas stream, characterized...