Ran Chen

Abstract: In order to develop a new mortar admixture and effectively apply black liquor, effect of grafted sulfonated black liquor on wet‐ready mortar property was investigated. The results showed that when the molar ratio of sodium sulfite/formaldehyde/acetone was 0.5:2:1, the polycondensation reaction time was 2.5 h at 95°C, the sulfonation degree of the product was 2.93 mmol·g−1 and the average molecular weight (Mw) was 13,200. When the dosage of modified product was 1.5 wt% in the mortar, the consistency loss of the mortar was 33.7% after 4h, the water retention was 90.1%, the setting time was 16.2h, and the bond strength of hardened mortar was 0.41MPa at 14d and 0.69MPa at 28d (the initial consistency was 90mm ± 5mm). This study has certain reference value for the development of wet‐ready mortar admixture, also has great significance in the environmental protection and application of renewable resource. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1395–1399, 2016