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Zurich, Switzerland

Holcim is a Swiss-based global building materials and aggregates company. Founded in 1912, the company expanded into France and then throughout Europe and Middle East during the 1920s. They expanded in the Americas during the 1950s and went public in 1958. The company continued to expand in Latin America and added Asian divisions during the 1970s and 1980s. A series of mergers and buyouts made Holcim one of the two largest cement manufacturers worldwide by 2014, roughly tied with rival Lafarge. In April 2014, the two companies agreed to a US$60 billion "merger of equals". The deal will face regulatory scrutiny and likely will take more than one year to complete.As of 2014, Holcim does business in more than 70 different countries and employs 71,000 people. The company is the market leader in cement production in Australia, Azerbaijan, India, Slovakia, Switzerland, and Latin America. Wikipedia.

Leemann A.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Merz C.,Holcim
Cement and Concrete Research | Year: 2013

There is little knowledge about the relation between AAR-induced damage observed in structures and the expansion potential obtained with accelerated tests. In this study, aggregates used in structures damaged by AAR were tested with the microbar test (MBT/AFNOR XP 18-594) and the concrete performance test (CPT/AFNOR P18-454). After the tests, the samples were examined using optical and scanning electron microscopy. Based on the results, the significance of the microbar test has to be examined very critically. The agreement of measured expansion, reacted rock types and the composition of the reaction products between the on-site concrete and the reproduced concrete subjected to the CPT clearly indicates that the reaction mechanisms in the structure and in the concrete performance test are comparable. As such, the concrete performance test seems to be an appropriate tool to test the potential reactivity of specific concrete mixtures. © 2013 Elsevier Ltd.

Carsana M.,Polytechnic of Milan | Frassoni M.,Holcim | Bertolini L.,Polytechnic of Milan
Cement and Concrete Composites | Year: 2014

Finely ground glass has pozzolanic properties that make attractive its recycling as supplementary cementitious material. This paper compares the behaviour of waste glass powders of different fineness with that of natural pozzolana, coal fly ash and silica fume. Chemical analysis, compressive strength measurements and durability tests were carried out to investigate the effect of ground glass on strength and durability performances of mortars. Blended both with Portland cement and lime, ground glass improved strength, resistance to chloride penetration and resistance to sulphate attack of mortars more than natural pozzolana and similarly to fly ash. Mortars with ground glass immersed in water for seven years did not show any sign of degradation and increased their compressive strength. The ranking of ground glass with respect to the other mineral additions was not affected by fineness. © 2013 Elsevier Ltd. All rights reserved.

Holcim | Date: 2014-04-08

In a process for the production of cement clinker, in which raw meal is preheated in a preheater (

Holcim | Date: 2013-01-03

In a device for taking samples from a material flow of fine-grained and dry material, in particular in the cement industry, comprising an upwardly open sample chamber (

In a device for the solar-thermal gasification of carbon-containing charging material, comprising a solar reactor (

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