Diatomaceous earth as a functional additive

Improved freeze-thaw resistance, strength and durability of concrete products

Concrete needs to exhibit a high freeze-thaw resistance to ensure long service lives, particularly in the case of concrete products used in road construction. This characteristic is primarily achieved by adding a suitable air void system (using surfactants or hollow microspheres).

A research project was initiated to investigate the application potential of natural and calcined diatomaceous earth as a concrete additive. Diatomaceous earth is also referred to as diatomite, kieselgur, natural/amorphous silica, or moler earth. This porous lightweight mineral based on silicon dioxide (SiO2) is...

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Issue 2018-02 Freeze-thaw resistance of concrete products

New research findings

The freeze-thaw resistance of concrete paving blocks must be verified by the slab test (DIN EN 1338). Sometimes clients in Germany demand the CDF method (DIN CEN/TS 12390-9). Independent of the test...

Issue 2017-02 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 2009-07 A new product optimizes manufacturing of concrete products

Special additive for higher water contents

Whereas the ready-mixed concrete and precast concrete industry predominantly makes use of plasticized and free-flowing concrete, concrete products, on contrary, are precast elements which are...

Issue 2016-02 Transferability of laboratory test results

Determining freeze-thaw resistance of precast products for road pavements under real-life conditions

Since February 2005, the freeze-thaw resistance of concrete pavers had to be determined in the modified slab test in accordance with DIN EN 1338. Some clients favor the CDF method even though there...

Issue 2013-02 Current findings with respect to the XF2 freeze/thaw test method

Freeze/thaw resistance at moderate water saturation levels

Generally accepted, internationally recognized methods (CIF and CDF) exist for testing the freeze/thaw resistance of concrete at high water saturation rates irrespective of the simultaneous action of...