4
obtained by mixing the respective reagents and the pre-
treated R5 tailing. The proportions used are presented in
Table 4.
Geomechanical Tests
The results of the simple resistance test of geopolymer spec-
imens are shown in Figure 2 and Table 4. The results indi-
cate that the compressive strength of geopolymer samples
varies from 2 MPa to 8 MPa. The Greater resistance was
achieved in the samples with a ratio SiO2/Al2O3 of 3.12
and a SiO2/NaOH ratio of 1.90, while the lowest resistance
was observed in the samples with a SiO2/Al2O3 of 2.90 and
a SiO2/NaOH ratio of 0.47 [45].
According to the Peruvian technical standard [46],
type 1 and type 2 bricks must meet the minimum com-
pression resistance of 4.9 and 6.0 MPa. While the value of
2.0 MPa is the minimum required for blocks used in non-
load-bearing wall construction.
Acid Base Accounting (ABA) Analysis
The results of the ABA test are summarized in Table 5.
According to the Net Neutralization Potential (NNP) clas-
sification criteria [47] and the Neutralization Potential/
Acidity Potential (NP/AP) classification criteria [48], only
the R5 tailings sample and the pretreated tailings sample
(RR5) are potential generators. mine acid drain (DAM).
Leaching Tests
For leaching tests, only geopolymerized samples that pre-
sented a simple resistance test factor greater than or equal to
4.0 were taken into account. The results of the leaching tests
are presented in Figure 3 and Table 6. The electrical con-
ductivity in the leaching tests varies between 13.91–16.11
mS/cm2 indicating that ions are present in the solution.
The pH of the resulting solution is in the basic range
for all geopolymerized samples. The concentrations of
leached elements are still below the maximum permissible
limits for water according to Peruvian legislation [49]. The
elements that leach in the greatest quantity are cadmium
and chromium with 69% and 93% respectively.
Table 4. Results of geomechanical tests of geopolymerized
tailings samples
Figure 2. Variation of simple comprehension tests of geopolymerized samples
obtained by mixing the respective reagents and the pre-
treated R5 tailing. The proportions used are presented in
Table 4.
Geomechanical Tests
The results of the simple resistance test of geopolymer spec-
imens are shown in Figure 2 and Table 4. The results indi-
cate that the compressive strength of geopolymer samples
varies from 2 MPa to 8 MPa. The Greater resistance was
achieved in the samples with a ratio SiO2/Al2O3 of 3.12
and a SiO2/NaOH ratio of 1.90, while the lowest resistance
was observed in the samples with a SiO2/Al2O3 of 2.90 and
a SiO2/NaOH ratio of 0.47 [45].
According to the Peruvian technical standard [46],
type 1 and type 2 bricks must meet the minimum com-
pression resistance of 4.9 and 6.0 MPa. While the value of
2.0 MPa is the minimum required for blocks used in non-
load-bearing wall construction.
Acid Base Accounting (ABA) Analysis
The results of the ABA test are summarized in Table 5.
According to the Net Neutralization Potential (NNP) clas-
sification criteria [47] and the Neutralization Potential/
Acidity Potential (NP/AP) classification criteria [48], only
the R5 tailings sample and the pretreated tailings sample
(RR5) are potential generators. mine acid drain (DAM).
Leaching Tests
For leaching tests, only geopolymerized samples that pre-
sented a simple resistance test factor greater than or equal to
4.0 were taken into account. The results of the leaching tests
are presented in Figure 3 and Table 6. The electrical con-
ductivity in the leaching tests varies between 13.91–16.11
mS/cm2 indicating that ions are present in the solution.
The pH of the resulting solution is in the basic range
for all geopolymerized samples. The concentrations of
leached elements are still below the maximum permissible
limits for water according to Peruvian legislation [49]. The
elements that leach in the greatest quantity are cadmium
and chromium with 69% and 93% respectively.
Table 4. Results of geomechanical tests of geopolymerized
tailings samples
Figure 2. Variation of simple comprehension tests of geopolymerized samples