Legal evaluation of damage

Varying strength values measured at the ready-mixed concrete plant and on the construction site, particularly for F5/F6 concretes – which party is liable?

Concrete supply agreements entered into with large construction contractors usually include the following (or similarly worded) sentence:

“The contractually agreed compressive strength class is verified for the test specimens produced on the construction site.” This is what the parties had also effectively agreed upon in the present case.

Very soft concretes pose the risk of segregation in the event of excessive compaction, which is why such concretes may only be subjected to gentle vibration or rodding.

According to good laboratory practice, cubes must be produced on a vibrating table, which...

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Issue 02/2014 Legal evaluation

Varying strength values measured at the ready-ixed concrete plant and on the construction site, particularly for F5/F6 ­concrete - which party is liable?

The agreement that the ready-mixed concrete plant entered into with the shell construction contractor pertains to the supply of appropriately specified concrete. Contractual performance is governed by...

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Issue 04/2010 Quality inspection

Improve quality and productivity through automation of concrete testing laboratories

For control purposes concrete is normally required to be tested under uniaxial compression, indirect tension and flexure. In view of the importance of concrete cube, cylinder and core testing within...

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Issue 09/2020

Compressive strength classes and performance classes of ultra-high-performance concrete (Part 1)

1 Introduction The spectrum of normal weight concretes covered by DIN EN 206 [1] and DIN EN 1992-1-1 [2, 3] ends at compressive strength class C100/115 in Germany at present. The characteristics...

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Issue 03/2011 Compression testing machines

Tests for high-strength and high-performance concrete

Mortar and concretes with a compressive strength of up to 800 N/mm² are currently under development. Typical fields of application of high-strength concrete and high-performance concrete are: »...

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Issue 07/2022

Compacting concrete – The state of the art of laboratory vibrating table technology

1 Theoretical principles of concrete compaction The fresh concrete to be produced is composed of cement, aggregate of different particle sizes, mostly between 0.25 to 32 mm, and mixing water. Today,...

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