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ACCELERATOR ADDITIVE FOR EXCAVATION WITH A TBM - SODIUM SILICATE
SILICASIL - TS/AC32 is a cement accelerator. Its action significantly reduces the setting time of the cement present in the mixture to be injected, enabling cement slurries with a high W/C ratio to be prepared.
Fields of use
The accelerator function of SILICASIL - TS/AC32 activates the setting process of the cement mortar used to fill the gaps between and behind the ashlars used to line tunnels dug with a TBM.
The use of SILICASIL - TS AC 32 is recommended because:
• it increases the setting speed of mixtures to be injected even with a high W/C ratio;
• its performance remains unchanged in the presence of water in the soil through which the TBM is digging;
• according to the dosage, the setting times range from 8 to 30 seconds.
CONSOLIDANT ADDITIVE FOR ASHLARS APPLIED WITH A TBM
The TBM SYSTEM is a bicomponent system for cement-based injections formulated specifically for consolidation work in tunnels. The system is made up of two components that are added to an ordinary cement mixture of water and cement:
COMPONENT A, a retarding and fluidifying additive designed to increase the workability of cement mortars or injection slurries, up to 72 hours after preparation.
COMPONENT B, made up of a cement accelerator that speeds up considerably the setting of the cement present in the injection mixture, even when preparing slurries with a high W/C ratio.
Fields of use
The principal field of use of the TBM SYSTEM is in injections used to fill the gaps between and behind the ashlars used to line tunnels dug with a TBM.
The TBM SYSTEM produces cement mixtures that can be stored for long periods so as to avoid the risk of blocks during unscheduled stops of the TBM.
RETARDING ADDITIVE FOR SETTING OF MORTARS AND CONCRETE
RETARD 48 is a ready-to-use liquid retarding additive, based on high molecular weight synthetic polymers, which makes it possible to package mortars and concretes with a high level of workability up to 48 hours after mixing.
RETARD 48 is a product free of chlorides and complies with the UNI 934-2, UNI 480-1 e 2 standards.
Field of use
RETARD 48, due to its characteristics, is particularly suitable for packaging:
• Mortars with very high workability maintenance even up to 48 hours from mixing;• Ready-mixed concrete in hot climates;
• pumpable concrete.
The use of RETARD 48 gives the mortar the following qualities:
• Maintenance of workability in mortars up to 48 hours;
• Absence of segregation in mortars during storage;
• Reduced setting times “once the mortar has been applied in thin layers”;• Reduction of construction costs;
• Reduction of waste
ITALGEL is the trade name of a series of natural clays with the ability to absorb water and swell. The principal component of bentonite is montmorillonite.
Fields of use
ITALGEL is used for various purposes in the laying of special foundations: bentonite sludge is used for laying diaphragm walls and drilling piles. In geotechnics bentonite is used in self-setting mixtures to produce plastic diaphragms, tamping mortars and injections.
The waterproofing properties of bentonite are used in environmental engineering to seal landfills and waterproof the soil.