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...

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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...

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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...

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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...

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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...

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