Latest Publications

Pore topology, volume expansion and pressure development in chemically-induced foam cements

by W Han, J Park, W Cha, JS Lee, JC Santamarina
Article Year: 2022


Foam cement is an engineered lightweight material relevant to a broad range of engineering applications. This study explores the effects of aluminum chips on cement-bentonite slurry expansion, pressure development, and the evolution of pore topology. The terminal volume expansion under free-boundary conditions or the pressure build up under volume-controlled conditions are a function of the aluminum mass ratio, bentonite mass ratio, and aluminum chip size. X-ray CT images show that finer aluminum chips create smaller pores but result in a larger volume expansion than when larger sized chips are used; on the other hand, large chip sizes result in unreacted residual aluminum. Time-lapse CT images clearly show the sequence of processes which lead to the development of foam cement: gas bubble nucleation, bubble growth, capillary-driven grain displacement enhanced by the presence of bentonite, coalescence, percolation, gas leakage and pore collapse. These results illustrate the potential to customize the mixture composition of chemically-induced gassy cement to control expansion and pressure build up, and to minimize percolating discontinuities and gas release.

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14th Middle East Geosciences Conference and Exhibition (GEO)
08:00 AM

The event "14th Middle East Geosciences Conference and Exhibition (GEO)" starts on 19 February 2023, 08:00 AM and ends on 21 February 2023, 06:00 PM. Please create separate events for each day, or modify the dates so the event only takes place in a single day


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