Effect and mechanism of alkaline activators on the performance of non-burnt sludge bricks
LIU Baozhong
Abstract：Samples of silt free bricks were prepared by mixing cement,sand,silt and alkali activator using pressing process,and the effects of alkali activator dosage on the performance of specimens and its mechanism were investigated through the tests of unconfined compressive strength,water absorption,softening coefficient,anti-freezing performance and 29Si nuclear magnetic resonance(29Si NMR)analysis.The results showed that:when the dosage of alkali exciter increased from 0 to 0.8％,the compressive strength of no-burn bricks increased from 20.49 MPa to 29.55 MPa,the water absorption rate decreased from 13.2％to 10.4％,the softening coefficient increased from 0.77 to 0.91,and the freeze-thaw mass loss rate decreased from 5.7％to 0.7％;when the dosage was in-creased to 1.0％,the compressive strength was decreased to 26.45 MPa,the water absorption rate increased to 12.0％,the softening coefficient decreased to 0.85,and the freeze-thaw mass loss rate increased to 1.5％.
Keywords：alkali activatornon-burnt brickpropertiesmicrostructurestabilization mechanism
Publication Date：2025-04-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 65-69 )