Waste paper ash as a hydraulic road binder: Hydration, mechanical and leaching considerations

Baloochi, Hani; Aponte, Diego; Bizinotto, Marilda Barra

doi:10.1016/j.jenvman.2022.115042

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…The concentration of K 2 O and the linked Sylvite was prominent and was expected to play a vital role, showing chemical properties largely varying from conventional coal burning fly ash and PSA. Sylvite was predicted to behave similarly to arcanite, creating an ambient environment for breaking the glass phase of PSA particles, additionally acting as a motivator during the early phases of hydration [37]. The existence of sulfates from potassium sulphates was predicted to promote the dissolution of PSA by decreasing the amount of Ca +2 and Al +3 in the mixture, forming ettringite and hence enhancing the system solidity [44].…”

Section: Physical and Chemical Properties Of Fillersmentioning

confidence: 99%

“…The recycling of waste papers process generates waste ash that may be used in paving roads due to its cementitious characteristics [32][33][34][35]. Waste paper sludge ash has recently received attention in construction applications due to its beneficial cementitious characteristics [36,37]. PSA can be strongly used as a cementitious filler instead of OPC if an activation agent is utilized with it to produce cold mixtures with superior or at least compatible properties to HMA [1,37].…”

Section: Introductionmentioning

confidence: 99%

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A Sustainable Cold Mix Asphalt Mixture Comprising Paper Sludge Ash and Cement Kiln Dust

et al. 2022

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Concerns about the environment, the cost of energy, and safety mean that low-energy cold-mix asphalt materials are very interesting as a potential replacement for present-day hot mix asphalt. The main disadvantage of cold bituminous emulsion mixtures is their poor early life strength, meaning they require a long time to achieve mature strength. This research work aims to study the protentional utilization of waste and by-product materials as a filler in cold emulsion mixtures with mechanical properties comparable to those of traditional hot mix asphalt. Accordingly, cold mix asphalt was prepared to utilize paper sludge ash (PSA) and cement kiln dust (CKD) as a substitution for conventional mineral filler with percentages ranging from 0–6% and 0–4%, respectively. Test results have shown that the incorporation of such waste materials reflected a significant improvement in the mixture’s stiffness and strength evolution. The cementitious reactivity of PSA produces bonding inside the mixtures, while CKD is used as an additive to activate the hydration process of PSA. Therefore, based on the results, it will be easier to build cold mixtures by shortening the amount of time needed to reach full curing conditions.

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Section: Physical and Chemical Properties Of Fillersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Sustainable Cold Mix Asphalt Mixture Comprising Paper Sludge Ash and Cement Kiln Dust

et al. 2022

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“…However, in most cases, WPA contains cementitious properties [ 33 , 34 ] and, to some extent, follows the same pattern as cement. After mixing WPA with water, lime makes the solution alkaline (around 12) [ 35 ].…”

Section: Introductionmentioning

confidence: 99%

“…In the previous study, the usability of WPFA as a binder was discussed [ 35 ]. In summary, WPFA was successfully used as the sole binder to stabilize the given soil.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Comparison between Waste Paper Fly Ash and Traditional Binder as Hydraulic Road Binder Exposed to Sulfate Concentrations

2022

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Sulfate attack is one of the drawbacks of cementitious materials for stabilized soils. In the current study, a durability comparison of stabilized soil with cement (Type IV) and waste paper fly ash (WPFA) was conducted. First, the treated soil’s unconfined compressive strength (UCS) was tested. Next, the treated soil was subjected to various wetting/drying cycles with various sulfate concentrations and temperatures for a year. In the meantime, samples were taken for DRX, FTIR, and TGA microstructural analyses. Additionally, samples were manufactured to track swelling over an 800 day period. The outcomes show that WPFA’s UCS remained constant. Furthermore, ettringite development can be seen in the microstructural studies, however testing on linear displacement over 800 days revealed no significant changes in swelling. Finally, SEM was used to verify the ettringite formation at 360 days in order to confirm the previous findings. All the results indicated that stabilizing soil with 5% of WPFA and 3% of cement IV is possible even in presence of high sulfate concentrations, while maintaining the durability of the structure.

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Application of solid waste materials in cold bitumen emulsion mixtures for cleaner pavement industry: a comprehensive review

Malik,

Mir,

Mohanty

2024

Environ Sci Pollut Res

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Waste paper ash as a hydraulic road binder: Hydration, mechanical and leaching considerations

Cited by 4 publications

References 30 publications

A Sustainable Cold Mix Asphalt Mixture Comprising Paper Sludge Ash and Cement Kiln Dust

A Sustainable Cold Mix Asphalt Mixture Comprising Paper Sludge Ash and Cement Kiln Dust

Long-Term Comparison between Waste Paper Fly Ash and Traditional Binder as Hydraulic Road Binder Exposed to Sulfate Concentrations

Application of solid waste materials in cold bitumen emulsion mixtures for cleaner pavement industry: a comprehensive review

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