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US 2021/0269718 A1Published application
Foaming additive with low ecotoxicological impact for soil conditioning in the presence of mechanised excavation
AssigneeMapei S.P.A.
InventorsMassimo Stefanoni, Marco Squinzi, Carlo Pistolesi, Enrico Dal Negro, Alessandro Boscaro
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Abstract
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.
Claims9
Method of generating a foam with a soil conditioning additive in liquid, paste or powder form, said foam being able to condition soil during mechanised excavations with a tunnel boring machine, said method comprising
- adding a salified alkyl ether sulphate surfactant having a straight or branched C7-C11 alkyl chain and a degree of ethoxylation ranging from 4 to 9 to an aqueous solution used during said mechanised excavation;
- and
- generating said foam.
Dependencies are inferred from the claim text.