Sulfuric acid resistance behaviour of alkali-activated slag and waste glass powder blended precursors

Sun, Keke; Ali, Hafiz Asad; Xuan, Dongxing; Poon, Chi Sun

doi:10.1016/j.cemconcomp.2023.105319

Cited by 9 publications

(2 citation statements)

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“…This reason can be attributed to the larger size gypsum crystals that seemed to help form a compact core-shell structure on the surface of the AAMs. This thick nodular gypsum layer on the surface might reduce the deterioration and diffusion of ions, and this nding was consistent with our previous study on the sulfuric acid attack of AAMs [43]. Overall, the improvement effect of ISSA on the sewage erosion of the AAMs resulted from the heavy metals as antimicrobial agents, and the low calcium content.…”

Section: Inhibition Mechanism Of Issasupporting

confidence: 91%

“…Overall, one important consequence related to the formation of gypsum may be the volume expansion which may ultimately lead to the deterioration of the AAMs in non-submerged areas. But the reasons for the superior performance of the GP/GGBSrich AAMs (between the white lines) were attributed to the acid buffering capacity of the aluminum phase and the formation of a pore-lling aluminum gel that exhibited better cohesion to the degraded layer, as discussed in previous [41][42][43].…”

Section: Corrosion Mechanism Of Sewagementioning

confidence: 87%

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Recycling of incinerated sewage sludge ash and waste glass powder in alkali-activated slag/glass powders for sewer rehabilitation

Sun,

Ali,

Cai

et al. 2024

Preprint

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A new era has dawned in the manufacturing of cement-free binders with appropriate mechanical strengths and durability to combat CO2 emissions. However, the assessment of their performance in extreme conditions is ongoing. Here, we attempted to use incinerated sewage sludge ash (ISSA), a waste product of sewage sludge incineration that contains limited amounts of heavy metals, along with waste glass powder (GP) and ground granulated blast furnace slag (GGBS), as precursors to produce cement-free binders through alkali-activation. The alkali-activated materials (AAMs) were then subjected to an intensified sewage corrosion test for 6 months. The aim was to utilize the heavy metals in the ISSA as biocides to resist the biogenic acid attack on the AAMs. The experimental results indicated that superior performance was achieved by using a ternary binder prepared with ISSA, GP, and GGBS under biogenic acid simulation. Such enhanced durability can be attributed to the low Ca content in the resulting alkali-activated gels, which also reduced the grain size of gypsum formed and prevented expansion deterioration. Furthermore, the slow release of heavy metals from the AAMs prepared with the ISSA, evidenced by the leaching test results, was able to inhibit microbial growth.

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Section: Inhibition Mechanism Of Issasupporting

confidence: 91%

Section: Corrosion Mechanism Of Sewagementioning

confidence: 87%