Sustainable Use of Recycled-Glass Powder in Soil Stabilization: Fid-Bau Portal

Sustainable Use of Recycled-Glass Powder in Soil Stabilization

Arrieta Baldovino, Jair de Jesús / dos Santos Izzo, Ronaldo Luis / da Silva, Érico Rafael / Lundgren Rose, Juliana

This study investigates the performance of sustainable use of recycled-glass powder (GP) in soil improvement. The porosity/cement ratio ( $η / C_{iv}$ ) and curing time are employed to study the evolution of unconfined compressive strength ( $q_{u}$ ) and durability against wet–dry cycles (measuring of loss of mass) of a sedimentary silty soil of Guabirotuba formation, stabilized with GP and cement, in Southern Brazil. Three dry unit weights of molding ( $γ_{d}$ ), three cement contents ( $C$ ) between 3% and 9%, and curing times of 7, 28, and 90 days are used to study the influence of GP content (i.e., 5%, 15%, and 30% by weight) and $η / C_{iv}$ index on $q_{u}$ and accumulated loss of mass (ALM) of the compacted blends. The long-term strength improvement and durability are observed and well-fitted to a power function depending on the $η / C_{iv}$ ratio. When $γ_{d}$ , GP, and $C$ are increased and the initial porosity ( $η$ ) is reduced, $q_{u}$ strength and durability increase for all GP contents. The $η / C_{iv}$ ratio can also establish the empirical ratios between $q_{u}$ -ALM dependent on the GP contents used during compaction of the specimens. Finally, equations for dosing and estimating $q_{u}$ and ALM are obtained and set to 96.5% with a 6% error. Thus, all strengths and ALM percentages show the same normalized (i.e., divided) potential trend as the functions of GP, $C$ , and $γ_{d}$ , compatible for the value of $η / C_{iv}^{0.20} = 37.5 %$ by volume, and it may be possible to extend it to other compacted blends proposed in the recent literature, such as soil-lime and soil-cement-roof tile waste.