Materiali di Concrete Foam

foam concrete materials are used in various fields of civil engineering practice. They are most commonly used in sub-base layers of buildings or foundation structures, as a fill material in open spaces such as unused underground structures, and in insulating walls and floors.

U foam concrete materials have several advantages over traditional cement-based materials, such as low water-to-cement ratio (w/c) and high workability. They also have a lower bulk density and are more ductile, saving material inputs and improving the physical and mechanical properties of the concrete.

Fibers can increase the flexural strength of foam concrete, mainly by transferring tensile stresses through the bridging effect. In più, fibers can improve the post-cracking behavior of foam concrete.

A variety of natural fibers, such as sugar cane pulp fiber, coconut fiber, and coir fiber, can be added to foam concrete. In più, the use of these fibers can reduce drying shrinkage and water absorption.

Synthetic foaming agents are also widely used in foam concrete production. The additives are dissolved in water before being agitated through a “cigar”. They produce stable foamed concrete, which is also pump-able.

Protein-based foaming agents can be mixed with water, ma ùn sò micca adattati per mischjà cù plastificanti o agenti riducenti di l'acqua. Quandu un agenti di riduzzione d'acqua o plastificante hè mischju cù un agentu spumante basatu in proteini, a mistura hè inestabile è tende à segregate durante u mischju.

Microcracks sò osservati in l'imaghjini SEM di campioni di cimentu spuma esposti à 800 degC per via di a dissociazione di l'acqua ligata chimicamente è i prudutti di idratazione in a matrice di cimentu [18]. Quandu CF hè aghjuntu à u béton, si forma una struttura reta spaziu cù bona integrità.