The results demonstrate that the incorporation of sludge proceeding from tunnel boring into lime mortars with different aggregates is suitable for application in construction.
This study demonstrates how the properties of previously characterized sludge mixed with lime, water, additives, and silica sand increase the compressive strength in 44%, compared to mortars with only limestone elements. Moreover, in the mortars with limestone injection, it was noted that for a curing of 28 days, strength decreases proportionally with shorter curing times.
On the other hand, the mortars with silica sand were the only ones that had flexural strength resistances above 4 MPa, unless the curing time was less than 28 days. The mortars made with limestone and sludge had low flexural strength resistance, and it was concluded that they are more suitable for applications requiring tensile strength such as tunnels or roads.