Environmental Sustainability by Bulk Utilization of Fly Ash and GBFS as Road Subbase Materials

Bakare, M. D.; Pai, R. R.; Patel, Sankita J.; Shahu, J. T.

doi:10.1061/(asce)hz.2153-5515.0000450

Cited by 41 publications

(12 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2017 C and D waste generation by material in USA (source: US EPA, 2019a). Bakare et al (2019) that about 196 million tons of FA has been produced yearly since 2017 with almost 70% rate of utilization.…”

Section: Fly Ashmentioning

confidence: 99%

“…To tackle this, various researchers have in the last two decades studied means of incorporating sustainable materials in road construction to support conservation. Some of these methods include the reuse of selected waste materials such as construction and demolition wastes (Stehlik et al, 2015;Zhang et al, 2019), glass waste (Kadhim et al, 2019), Waste tire rubber (Bonicelli et al, 2017), fly ash and granulated blast furnace slag (GBFS) (Bakare et al, 2019), colliery spoils (Suescum-Morales et al, 2019), polyethylene terephthalate (PET) (Sojobi et al, 2016), mine tailings, shingles (Haas et al, 2019), aluminium dross (L opez-Alonso et al, 2019), and bio oils (Kousis et al, 2020) to list a few, in the construction and rehabilitation of roadways. These materials have been evaluated separately or alongside other waste materials as a full or partial replacement for certain traditional construction materials.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Bamigboye

Bassey

Olukanni

et al. 2021

Journal of Cleaner Production

View full text Add to dashboard Cite

The rate at which the construction industry explores and consumes non-renewable natural aggregates and other industrial products such as bitumen, lime, and cement during construction and rehabilitation of road pavements has over time proven to be environmentally degrading and non-sustainable. This, alongside the issues of high solid waste generation and inadequate disposal, has led to series of studies by various researchers to find methods to integrate these solid wastes as alternative materials in road construction and maintenance. This paper provides a simple yet detailed review of recent relevant studies conducted to understand the alarming rate of generation and the effects of reusing these waste materials in both flexible and rigid pavements. The review further outlines the advantages and disadvantages of the selected waste materials and compare the results with that of conventional materials in accordance with relevant standards while highlighting the performance, and life cycle environmental and economic sustainability implications. The study shows that the adoption of these materials offers efficiency in waste disposal while reducing the demand for natural aggregates and consequently, significantly reducing life cycle impacts and costs. The challenges limiting the effective practical implementation of these waste recycling techniques in the construction industry were discussed and possible solutions were suggested to encourage and ensure its utilization in road construction.

show abstract

Section: Fly Ashmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Bamigboye

Bassey

Olukanni

et al. 2021

Journal of Cleaner Production

View full text Add to dashboard Cite

show abstract

“…Moreover, the materials with a low elastic modulus are known to produce an elasticplastic deformation to accommodate the expansive components of other materials [30- Moreover, the materials with a low elastic modulus are known to produce an elasticplastic deformation to accommodate the expansive components of other materials [30][31][32][33]. The 28-day elastic modulus of the cement-fly-ash binder with high content of fly ash was found to be less than 1 GPa [34,35], while the 28-day elastic modulus of the cement binder was more than 20 GPa [36]. Compared with the cement binder alone, the cement binder with a large amount of fly ash exhibited characteristics of low elastic modulus, low brittleness and high creep compliance at early stages [37][38][39][40].…”

Section: Inhibition Mechanism Of Fly Ash On Expansionmentioning

confidence: 99%

Studies on the Volumetric Stability and Mechanical Properties of Cement-Fly-Ash-Stabilized Steel Slag

2021

View full text Add to dashboard Cite

The stability of steel-slag road materials remains a critical issue in their utilization as an aggregate base course. In this pursuit, the present study was envisaged to investigate the effects of fly ash on the mechanical properties and expansion behavior of cement-fly-ash-stabilized steel slag. Strength tests and expansion tests of the cement-fly-ash-stabilized steel slag with varying additions of fly ash were carried out. The results indicate that the cement-fly-ash-stabilized steel slag exhibited good mechanical properties. The expansion rate and the number of bulges of the stabilized material reduced with an increase in the addition. When the addition of fly ash was 30–60%, the stabilized material was not damaged due to expansion. Furthermore, the results of X-CT, XRD and SEM-EDS show that fly ash reacted with the expansive component of the steel slag. In addition, the macro structure of the stabilized material was found to be changed by an increase in the concentration of the fly ash, in order to improve the volumetric stability. Our study shows that the cement-fly-ash-stabilized steel slag exhibits good mechanical properties and volumetric stability with reasonable additions of fly ash.

show abstract

“…Sustainable embankment materials are desired globally by geotechnical experts from durability, cost-efectiveness, and optimization perspectives for civil engineering infrastructures [1][2][3][4][5][6][7][8][9][10]. Urbanization around the world is going on fast-track [11] due to which the problematic soils sites are also in demand for soils improvement (stabilization).…”

Section: Introductionmentioning

confidence: 99%

Micro to Nanolevel Stabilization of Expansive Clay Using Agro-Wastes

Munawar

Khan

Rehman

et al. 2023

Advances in Civil Engineering

View full text Add to dashboard Cite

The circular economy encourages the production and consumption of sustainable embankment geomaterials and their blends utilizing recycled waste materials in roads, railway tracks, airfields, and underground structures. Geomaterials comprising high-plastic soft expansive clay pose excessive settlement during cyclic traffic/railway/airfield loading resulting in uneven geometry of overlying layers. This paper demonstrates multiobjective optimized improvement of expansive clay (C) geotechnical characteristics by cost-effective agro-wastes additives at microlevel (by 3% to 12% rice husk ash, i.e., RHA), nanolevel (by 0.6% to 1.5% rice husk derived green nano-SiO2, i.e., NS), and synergistic micro to nanolevel (NS-RHA). The swell potential, resilient modulus (MR), initial elastic modulus (Es), unconfined compressive strength (UCT), and California bearing ratio (CBR) of C and its blends were determined. The chemical characterization of C and its blends were conducted through Fourier transform infrared spectroscopy (FTIR) and optical microscopic tests. The outcome of this study depicted that the cost ratio for the optimized composite, i.e., (1.2% NS-9% RHA)/(9% RHA) is 1.22 whereas stiffness ratio MR (NS-RHA)/MR(RHA) and Es (NS-RHA)/Es(RHA) and strength ratio UCT(NS-RHA)/UCT(RHA) and CBR(NS-RHA)/CBR(RHA) were found to be 2.0, 1.64, 2.17, and 2.82, respectively. FTIR revealed the chemical compatibility between C, RHA, & NS from durability perspective. Cost-stiffness results of this study can be applied by geotechnical experts to economize the green stabilization of C by use of agro-waste for sustainable development.

show abstract

Environmental Sustainability by Bulk Utilization of Fly Ash and GBFS as Road Subbase Materials

Cited by 41 publications

References 15 publications

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Studies on the Volumetric Stability and Mechanical Properties of Cement-Fly-Ash-Stabilized Steel Slag

Micro to Nanolevel Stabilization of Expansive Clay Using Agro-Wastes

Contact Info

Product

Resources

About