	US 11,697,768 B2
	Foaming additive with low ecotoxicological impact for soil conditioning in the presence of mechanised excavation
Massimo Stefanoni, Milan (IT); Marco Squinzi, Milan (IT); Carlo Pistolesi, Milan (IT); Enrico Dal Negro, Milan (IT); and Alessandro Boscaro, Milan (IT)
Assigned to MAPEI SPA, Milan (IT)
Appl. No. 17/262,389
Filed by MAPEI SPA, Milan (IT)
PCT Filed Jul. 23, 2019, PCT No. PCT/IB2019/056273 § 371(c)(1), (2) Date Jan. 22, 2021, PCT Pub. No. WO2020/021445, PCT Pub. Date Jan. 30, 2020.
Claims priority of application No. 102018000007438 (IT), filed on Jul. 23, 2018.
Prior Publication US 2021/0269718 A1, Sep. 2, 2021
Int. Cl. C09K 17/16 (2006.01); C09K 17/32 (2006.01); E21D 9/00 (2006.01); E21D 9/10 (2006.01)

CPC C09K 17/16 (2013.01) [C09K 17/32 (2013.01); E21D 9/001 (2013.01); E21D 9/10 (2013.01)]

5 Claims

1. A method of generating a foam starting from 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 soil conditioning additive comprising a salified alkyl ether sulphate surfactant having a straight or branched C7-C11 alkyl chain and a degree of ethoxylation ranging from 7 to 9, from 5 to 50% by weight of the surfactant of an acyl glutamate and from 10 to 50% by weight of the surfactant of alkyl polyglucosides

said method comprising

adding said salified alkyl ether sulphate surfactant to an aqueous solution used during said mechanised excavations; and

generating said foam.