Potentials of steel slag and copper mine tailings as construction materials

2014 ◽  
Vol 18 (sup6) ◽  
pp. S6-250-S6-254 ◽  
Author(s):  
E. A. Oluwasola ◽  
M. R. Hainin ◽  
M. M. A. Aziz ◽  
H. Yaacob ◽  
M. N. M. Warid
2016 ◽  
Vol 78 (7-3) ◽  
Author(s):  
Mohd Rosli Hainin ◽  
Ebenezer Akin Oluwasola ◽  
Md. Maniruzzaman A. Aziz ◽  
Suleiman Arafat Yeroc

Water damage is a vital factor affecting the durability of gap-graded asphalt. There is an urgent need for a pragmatic and reasonable test to evaluate this parameter. Previous research has proposed that tensile strength ratio is a promising test for this application. Therefore, the aim of this paper is to evaluate the effect of moisture damage on gap-graded asphalt mixture incorporating electric arc furnace (EAF) steel slag and copper mine tailings (CMT). Four material mixtures of eight mix designs were investigated. Each mix was conditioned in water for 24-hour and 48-hour before testing. The study adopted retained strength index (RSI), durability index (DI) and tensile strength ratio (TSR) to describe the durability of gap-graded asphalt incorporating EAF steel slag and copper mine tailings. The results reveal that all the mixes fulfill the prescribed criteria. Also, there is a strong correlation between the retained strength index and the durability index with a strong coefficient of determination, R2 of 0.9543. The results of the study further showed that gap-graded asphalt mixture incorporating EAF steel slag and copper mine tailings did not seem to pose any problem.


2021 ◽  
Vol 3 (8) ◽  
Author(s):  
Paul M. Antonelli ◽  
Matthew G. Coghill ◽  
Wendy C. Gardner ◽  
Lauchlan H. Fraser

AbstractPhytostabilization is the use of plants and soil amendments to physically stabilize and remediate contaminated mine wastes and to control wind and water erosion in semiarid environments. The aim of this study was to evaluate two native bunchgrass species’ (Pseudoroegneria spicata and Festuca campestris) biomass accumulation and metals uptake response to locally available soil amendments (compost, wood ash and wood chips) to determine their suitability for phytostabilization at an alkaline copper mine tailings site in British Columbia, Canada. In the greenhouse, bunchgrasses important as forage for livestock and wildlife were grown in tailings with various ash–compost–wood chip combinations and evaluated using a randomized complete block design with 13 treatments and 10 replicates. Plants were harvested after 90 d, and tissues were analyzed for root and shoot biomass. Tissue samples (n = 3) from three treatment subsets (ash, compost, blend) were selected for elemental analysis. Biomass increased with increasing compost applications, and the response was greatest for P. spicata. Shoot molybdenum exceeded the maximum tolerable level for cattle and was significantly higher when grasses were grown on the ash treatment (183–202 mg kg−1) compared to the others (19.7–58.3 mg kg−1). Translocation and root bioconcentration factors were highest on the ash treatment (2.53–12.5 and 1.75–7.96, respectively) compared to the other treatments (0.41–3.43 and 1.47–4.79, respectively) and indicate that both species are ‘accumulators.’ The findings suggest that these bunchgrasses were not ideal candidates for phytostabilization due to high shoot tissue molybdenum accumulation, but provide important considerations for mine restoration in semiarid grassland systems.


Fibers ◽  
2017 ◽  
Vol 5 (4) ◽  
pp. 47 ◽  
Author(s):  
Lin Yu ◽  
Zhen Zhang ◽  
Xiao Huang ◽  
Binquan Jiao ◽  
Dongwei Li

Author(s):  
L.B. Zhou ◽  
R. van de Graaff ◽  
H.W. Dai ◽  
Y.J. Wu ◽  
L.N. Wall

2019 ◽  
Vol 365 ◽  
pp. 905-911 ◽  
Author(s):  
Rodrigo Ortiz-Soto ◽  
Daniela Leal ◽  
Claudia Gutierrez ◽  
Alvaro Aracena ◽  
Adrian Rojo ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document