Effect of air pollution-controlled residue of a sewage sludge incinerator on the drying shrinkage and the pore structure of alkali-activated materials

Ban, Jiaxing; Sun, Keke; Lü, Jianxin; Ali, Hafiz Asad; Yao, Jun; Sunahara, Geoffrey I.; Poon, Chi-Sun

doi:10.1016/j.wasman.2023.03.003

Cited by 8 publications

(1 citation statement)

References 38 publications

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“…In fact, the evaporation of internal free water in the mixture under environmental conditions caused drying shrinkage that was dominated by macroporous and mesoporous structures in the mixture. Free water from the macropores first evaporated due to the low capillary pressure (tension) inside pores, which corresponded to a significant and rapid initial drying shrinkage lasting up to 10 days [71,72]. These characteristics were matched with test results in Figure 8b.…”

Section: Drying Shrinkage and Mass Changesupporting

confidence: 73%

Synthesis and Evaluation of Geopolymer Mixtures Containing Chronologically Aged Basic Oxygen Furnace Slags

Tukaziban,

Shon,

Zhang

et al. 2023

Sustainability

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Applying industrial by-products as a substitution for conventional construction materials (natural resources) is a superior solution for the environment in terms of waste management and reduction in greenhouse emissions and for the construction industry in terms of cost and expenditure. Applying basic oxygen furnace slag (BOFS), one of the metallurgical industry by-products, as a construction material can be a high-potential and promising idea. However, the utilization of BOFS in construction applications is considerably limited because of its inherent characteristics leading to volumetric expansion behavior caused by the chemical reaction between free lime (f-CaO) and water. This study used geopolymer technology to stabilize the expansive behavior of chronologically aged BOFS aggregates. The compressive strength, expansion behavior, and drying shrinkage characteristics of a normal ordinary Portland cement (OPC) mixture and a geopolymer mixture containing siliceous river sand and chronologically aged BOFS aggregates were investigated. The test results showed that the compressive strength of geopolymer mixtures containing chronologically aged BOFS aggregate achieved 64.02 MPa, and the expansion behavior of geopolymer mixtures was improved compared with normal OPC mixtures containing the same BOFS aggregates, reaching 0.02% and 0.44%, respectively. However, due to the air-curing method, geopolymer mixtures had higher drying shrinkage values than normal OPC mixtures. Therefore, further studies should be conducted to investigate how to control the drying shrinkage of geopolymer mixtures containing chronologically aged BOFS aggregate.

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Section: Drying Shrinkage and Mass Changesupporting

confidence: 73%