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Concrete retarder (VZ) EN 934.-2, T8

For use on long transport routes, at high temperatures and for large concreting sections.

Concrete retardants increase the processing time of the concrete. A retarder should be added to the concrete if long transport routes have to be bridged.
The concrete admixture is also often used when processing bulky concrete parts. Massive components include concrete parts with a minimum dimension that is equal to or greater than 0.80 m.

In addition, a concrete retarder optimizes working time at high outside temperatures. Temperature peaks and temperature stresses are reduced during the hardening process.

Concrete retarders slow down hydration of the concrete. In this chemical reaction, hardening of the concrete is actively prolonged by adding a concrete retarder. The areas of application for concrete retarders are diverse. We would be happy to help you select the right product.

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    Concrete retarder (VZ) EN 934-2, T8




    ALPHALITH® Concrete Retarder 1 VZ is a liquid, concentrated retarder based on selected inorganic active ingredients. ALPHALITH® Concrete Retarder 1 VZ provides a good reproducability of retardation under given conditions.


    • retardation of set and hardening
    • retardation of up to about 24 hours
    • good reproducability of retardation times with a given mix
    • increased final strength
    • reduced temperature peaks of heat of hydration
    • reduced tendency towards cracking

    Field of Application:

    • ready-mix-concrete bridging over long transport ways from the batching plant to building site
    • pumped concrete
    • avoiding workability loss in long distance pumping
    • jointless production of large-size structural parts
    • avoidance of cracking in large-size concrete parts by reduction of heat of hydration

    We are happy to advise you

    We will be happy to help you select a suitable concrete retarder for your concrete block products. We analyze your precise requirement profile together with you. Our own quality management system guarantees consistent quality. All products and services of Rhein-Chemotechnik GmbH are measured and evaluated in accordance with the specifications of a DIN EN ISO 9001 certified quality management system.

    We are happy to advice you

    We are happy to advise you

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      Concrete admixtures for a wide range of applications

      We stock concrete admixtures for the concrete block industry, the precast concrete industry, as well as for ready-mixed and construction site concrete.
      Please contact us. We will be happy to advise you.

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      With our team of 40 employees, we develop and sell high-quality concrete admixtures and surface protection products. With fixed project partners, we accompany you from the first enquiry to the use of our products on your site.


      Rhein-Chemotechnik GmbH
      Gewerbepark Siebenmorgen 8
      53547 Breitscheid

      Phone. +49 (0)2638 | 9317-0

      Business hours
      Mon - Thu 08.00 a.m. - 17.00 p.m
      Fri 08.00 a.m. - 16.00 p.m.