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Study on Mechanical Properties and Pore Structure Characteristics of Alkali Activation Sludge-cement Composites by Lei Guo; Wenhao Zhao; Lixia Guo; Zekun Wang is a Engineering article available to read on EtoBox.

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In this paper, the activity of alkali-activation sludge was studied under the condition of considering the particle size of sludge, and the utilization of sludge resources was realized. The sludge of 0-0.045 mm and 0.045-0.075 mm particle size obtained by manual treatment was used as the research object. CaO and CaO+NaOH were selected as alkaline activator for the laboratory testing, and the mechanical properties, microscopic phase and pore structure characteristics of sludge-cement composites were studied through SEM NMR and other technical means. The results show that: (1) The finer the mud particle size, the better the performance of mortar specimens after partial replacement of cement. (2) The effect of single doping CaO in activating the hydration reaction of sludge mortar is obvious at 0-7d of age, but the activation effect was not good at 7-28d of age. The compound doping CaO + NaOH slows down the hydration reaction of C 3 S and C 2 S in cement at 0-7d of age, but the activation effect is obvious at 7-28d of age. (3) Compared with single doping CaO, compound doping CaO+NaOH has a better activation effect on sludge activity of two particle sizes. The sludge mortar specimens w

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Author

Lei Guo; Wenhao Zhao; Lixia Guo; Zekun Wang

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Engineering (Physical Sciences)