Effect of wetting–drying cycles on compressive strength and microstructure of recycled asphalt pavement – Fly ash geopolymer

Hoy, Menglim; Rachan, Runglawan; Horpibulsuk, Suksun; Arulrajah, Arul; Mirzababaei, Mehdi

doi:10.1016/j.conbuildmat.2017.03.243

Cited by 164 publications

(31 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the contrary, 9% and 12% cement-stabilized specimens exhibited an increasing trend, denoting cement adequacy to react with soil particles in water's presence. The increasing trend of UCS for 9% and 12% under WD cycles (i.e., durability) was similar to the durability results obtained by Hoy et al [105] for recycled asphalt pavement flay ash (RAP-FA) composition. The inclination of UCS under wetting-drying cycles for 12% cement was larger than that for 6% cement, but the drastic increase of UCS for treated soil with 12% cement continued until two cycles; afterward, the slope decreased, as seen in Figure 12.…”

Section: Effect Of Cement Content On Soil Stiffnesssupporting

confidence: 88%

Strength and Durability of Cement-Treated Lateritic Soil

et al. 2021

View full text Add to dashboard Cite

The transportation infrastructure, including low-volume roads in some regions, needs to be constructed on weak ground, implying the necessity of soil stabilization. Untreated and cement-treated lateritic soil for low-volume road suitability were studied based on Malaysian standards. A series of unconfined compressive strength (UCS) tests was performed for four cement doses (3%, 6%, 9%, 12%) for different curing times. According to Malaysian standards, the study suggested 6% cement and 7 days curing time as the optimum cement dosage and curing time, respectively, based on their 0.8 MPa UCS values. The durability test indicated that the specimens treated with 3% cement collapsed directly upon soaking in water. Although the UCS of 6% cement-treated specimens decreased against wetting–drying (WD) cycles, the minimum threshold based on Malaysian standards was still maintained against 15 WD cycles. On the contrary, the durability of specimens treated with 9% and 12% cement represented a UCS increase against WD cycles. FESEM results indicated the formation of calcium aluminate hydrate (CAH), calcium silicate hydrate (CSH), and calcium aluminosilicate hydrate (CASH) as well as shrinking of pore size when untreated soil was mixed with cement. The formation of gels (CAH, CSH, CASH) and decreasing pore size could be clarified by EDX results in which the increase in cement content increased calcium.

show abstract

Section: Effect Of Cement Content On Soil Stiffnesssupporting

confidence: 88%

Strength and Durability of Cement-Treated Lateritic Soil

et al. 2021

View full text Add to dashboard Cite

show abstract

“… Energy feeds, cost and emissions from transferal waste resources such as blast furnace slag and fly ash to partially replace cement binders in concrete or asphalt-concrete pavements are argued here as key aspects. Some researchers (Silva et al, 2015;Hoy et al, 2017) suggest that recycling and reuse of materials may result in some strength loss due to aging, such that extracted recycled materials required to be stabilised by industrial wastes (Hasan et al, 2015). It is argued here that any future developed LCA frameworks should acknowledge positive mapping of transferred waste reuse credits, and require explicit recognition that recycling waste outputs divert away from landfilling sites.…”

Section: Summary and Gaps From The Reviewed Lca Frameworkmentioning

confidence: 99%

Critical review and methodological issues in integrated life-cycle analysis on road networks

Hasan

Whyte

Jassmi

2019

Journal of Cleaner Production

View full text Add to dashboard Cite

Life-cycle management of road network projects traditionally emphasise material production and construction stages, with less attention given to usage stage and functionality improvement. Increasingly there is a need to address: inconsistencies in cost attribute selection; adjusting for uncertainties and costs; clarifying system boundaries; data sources; functional units and regional or temporal applicability of life-cycle frameworks. The current study focuses on a critical literature review of life-cycle cost analysis (LCCA) and life-cycle assessment (LCA) research published in the last decade (post 2008) towards identification of research gaps. Accurately analysing all life-cycle stages, feedback loops, future cash and resource flows, and interlinking performance with overall sustainability can aid the decision-making process towards sustainable alternatives for constructing new, or rehabilitating existing roads. This review finds that the use of recycled materials, base/sub-base stabilisers and asphalt binder replacement has the potential of energy saving (≥ 34% or 3.1 TJ), mitigating landfill disposal issues, and greenhouse gas load reduction (≥ 34.5% CDE). Lack of real world LCCA-LCA application and stakeholder prejudice against recycled material usage are addressable by better stakeholder (decision-makers and road users) engagement via a social component. The proposed enhancements identified in this study can increase LCA/LCCA attraction to policy-makers, planners and users and ultimately ensure a more sustainable asset.

show abstract

“…To date, several attempts have been made to substitute virgin materials with recycled materials such as construction and demolition materials including recycled glass (RG) [ 6 , 7 ], crushed concrete (CC) [ 8 , 9 ], crushed brick (CB) [ 10 , 11 ], crushed waste rock [ 12 , 13 ], recycled plastics [ 14 , 15 ], reclaimed asphalt pavement [ 16 , 17 ], biosolids [ 18 ], coffee [ 19 ], crumb rubber [ 20 , 21 ], light-weight foamed glass [ 22 ], and different types of slags [ 23 , 24 , 25 ]. Lately, significant volumes of these materials have been well-utilized as new construction materials in different applications, such as typical civil, pipe bedding, rural road, and fill applications.…”

Section: Introductionmentioning

confidence: 99%

Permanent Deformation and Rutting Resistance of Demolition Waste Triple Blends in Unbound Pavement Applications

et al. 2021

Self Cite

View full text Add to dashboard Cite

Virgin quarried materials are becoming increasingly scarce in our environment, and these materials are no longer a viable or economical solution for the construction industry. The construction industry is constantly seeking new markets for recycled waste in civil engineering applications. This research’s primary focus is the optimization of the usage of recycled materials such as recycled glass (RG), crushed brick (CB), and crushed concrete (CC), in pavement base/sub-base applications. Various percentages of RG, up to 40%, were blended with two types of CC in this research. The CC and CB, which were used as triple blends in this research, were utilized for the upper (100% CC) and lower sub-bases (up to 50% CB). This study sought to establish the maximum amount of RG that could be incorporated in the triple blends with CB and CC whilst maintaining an acceptable performance. Thus, a comprehensive series of fundamental and advanced geotechnical laboratory tests, including repeated load triaxial (RLT) and wheel-tracker (WT) tests, were performed to assess the engineering properties and permanent deformation characteristics of these triple blends. The particle-size distribution curve and California Bearing Ratio (CBR) values of all the blends met the minimum requirements. Results of RLT tests confirmed that all the nominated blends were found to provide the resilient modulus value required to be used as pavement materials. The WT results on the triple blend with 15% RG showed that the specimen performed exceptionally well during the test and comfortably met the requirements to be used in pavement applications. Based on the engineering properties and permanent deformation results, up to 15% RG can be suggested for incorporation as an accompanying material in unbound roadwork applications. Subject to the outcomes of future field testing, there might be potential to increase the percentage of RG added in the blends up to 30%.

show abstract

Effect of wetting–drying cycles on compressive strength and microstructure of recycled asphalt pavement – Fly ash geopolymer

Cited by 164 publications

References 62 publications

Strength and Durability of Cement-Treated Lateritic Soil

Strength and Durability of Cement-Treated Lateritic Soil

Critical review and methodological issues in integrated life-cycle analysis on road networks

Permanent Deformation and Rutting Resistance of Demolition Waste Triple Blends in Unbound Pavement Applications

Contact Info

Product

Resources

About