Details

Autor(en) / Beteiligte

• Sun, Keke
• Ali, Hafiz Asad
• Cai, Yamei
• Xuan, Dongxing
• Poon, Chi Sun

Titel

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

Ist Teil von

• Materials and structures, 2024-05, Vol.57 (4), Article 88

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A new era has dawned in the manufacturing of cement-free binders with appropriate mechanical strengths and durability to combat CO 2 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.