Mapei Spa

Holcim Technology Ltd

Marco Squinzi

Giorgio Ferrari

Alberto Brocchi

Massimo Stefanoni

Carlo Pistolesi

Enrico Dal Negro

Cristiano Maltese

Vincenzo Russo

Matteo Magistri

Tiziano Cerulli

Paolo Clemente

Alessandro Boscaro

Potito D'Arcangelo

Emanuele Banfi

Francesco Surico

Paolo Antonio Zambianchi

Vittorio Franceschi

Francesco Carbone

Daniele Peila

Lino Badesso

Mariele Gamba

Giuseppe Alampi

Elisa Portigliatti

Federico Morchio

Anna Bravo

Michele Nicodemi

The present invention relates to the use of foaming additives in liquid, paste or powder form, to condition soil excavated with a tunnel boring machine. Said additives can be classified as readily biodegradable and are characterised by a lower ecotoxicological impact than commercial products.

Foaming additive with low ecotoxicological impact for soil conditioning in the presence of mechanised excavation

The object of the present invention is a novel admixture comprising a hardening accelerator for hydraulic compositions based on Portland cement and other supplementary cementitious materials.

Accelerating admixture for hydraulic compositions

Disclosed is a liquid foaming additive for use in mechanised excavation by a tunnel boring machine, containing 5-40% by weight of one or more surfactants, 0.01-5% by weight of one or more biopolymers, and 55-94.99% by weight of water.

Foaming additive for soil conditioning in the presence of mechanised excavation for tunnel construction

The present invention relates to a method for producing aggregates from concrete residues which are not used for construction purposes or, more generally, from cement mixtures which are unused for any reason and returned to the production facility in the truck mixer. The present invention also relates to the material obtained by said process and its use as an aggregate for concrete production or other applications.

Method for producing aggregates from returned concrete

The present invention describes a hardening accelerating admixture for hydraulic binders, the accelerator being based on transition metal silicate hydrates having the general formula: aMeObMO cAlOSiOdHO 1) where&#x2014;Me represents a transition metal whose molar coefficient a is in a range between 0.001 and 2, preferably between 0.01 and 1; &#x2014;M represents an alkaline earth metal whose molar coefficient b is in a range between 0 and 2, preferably between 0.3 and 1.6; &#x2014;The molar coefficient c for AlOis in a range between 0 and 2, preferably between 0.1 and 1; &#x2014;HO represents the hydration water of the silicate hydrate whose molar coefficient d can vary within a wide range between 0.5 and 20; x and y can both be equal to 1 or different, depending on the valence of the transition metal, given that the valence of the oxygen atom in the metal oxide is equal to 2.

Accelerating admixture for cementitious compositions

A method for producing aggregates from fresh cement compositions, included concrete and residual concrete is disclosed, comprising the addition of a) flash setting accelerators and b) super-absorbent polymers to fresh unset cement compositions and blending this mixture until granular materials are formed.

Method for producing aggregates from cement compositions

A method for reducing hexavalent chromium in cement comprising the addition, to said cement, of antimony(III) compounds as reducing agents.

Additives and methods for reducing hexavalent chromium in cement

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Milan, Italy

Marco Squinzi