The construction sector is one of the world’s largest industry segments. New technologies and construction trends are creating new solutions like additive manufacturing (3D Printing). For these continually changing needs and demands construction chemicals play an important role. Our Lohtragon® metal salts have proven suitability for these purposes.
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Admixtures for Cement
From the very broad-ranging field of construction chemical additives, Lohtragon® offers more
From the very broad-ranging field of construction chemical additives, Lohtragon® offers a group of metal salts that are used as hardening retarders and accelerators in cement and plaster-based systems. Typically, Portland cement containing binders, such as lime/cement plasters, require a hardening accelerator, to treat surfaces as quickly as possible after their application.
Selected Lohtragon® metal salts have been gathered in a Lohtragon® product selector for admixtures with various Lohtragon® accelerators and retarders allowing flexibility of the concrete setting time within a wide range.
Cements contain hexavalent Chromium (Chromate) compounds which are critical for health and safety reasons (e.g. toxic, carcinogenic). Impurities of chromium components in cements derive from natural impurities and during raw material processing. The formed hexavalent chromium (chromium (VI) compounds) need to be converted into less critical trivalent Chromium (Chrome(III) compounds) by adding the Lohtragon® Chromate reducing agents.
Case study:
Lohtragon® V01 is the answer: Highly efficient due to maximized Ferrous content and in liquid form (stabilized solution). It is easy to apply as dosage of liquid ingredients during cement production widely used. Dr. Paul Lohmann® holds the patent on this specific chromium reducing product.
The hardening time of non-retarded gypsum is just a few minutes, making careful processing almost impossible. Therefore, gypsum-based systems generally require retarders. For this purpose, the Lohtragon® range offers a selection of fine-grained products compatible with gypsum and adjusting the hardening time to the required level.
Calcium Sulfate Hemihydrate – settable gypsum – exits in crystal forms of alpha- and beta-hemihydrate. These gypsum types show different physical properties. Therefore, a selective production is required. Adding a crystal morphology modifier to the calcination process of the dihydrate gypsum improves this selectivity.
Case study:
The Lohtragon® B45 has proven track record in modifying the crystal habit forming the structure of alpha-hemihydrate gypsum which is very hard and used for molding plaster and special requirements.
Applicable to : Admixtures for Cement, Retarders for gypsum
The information given in the document corresponds to our current knowledge. We warrant in the frame of our General Terms and Conditions of Sale that our products are manufactured in accordance with the specifications. However, we disclaim any liability with regard to the suitability of our products for a particular purpose or application or their compatibility with other substances. Tests have to be performed by the customer who also bears the risk in this respect. Nothing herein shall be construed as a recommendation to use our products in conflict with third parties' rights.
