Prospect of sodium lignosulfonate derived from hardwood black liquor as ingredient in mortar
2011
Mudiastuti. S. | Suryokusumo, S., Bogor Agricultural Univ., Kampus Darmaga, Bogor 16680 (Indonesia). Dept. of Agricultural Engineering | Syahbirin, G. | Yumairoh, Y., Bogor Agricultural Univ., Kampus Darmaga, Bogor 16680 (Indonesia). Dept. of Chemistry
Lignosulfate, derived from grasses and softwood lignins are able to increase workability of concrete mixture. Based on the availability of hardwood as raw material in pulp and paper industry in Indonesia, the black liquor from this sector will be enormous. This experiment sought to prove that sodium lignosulfonate (NaLS) derived from hardwood would give mortar mixture better physical and mechanical properties as compared to commercial sodium lignosulfonate. Lignosulfonate was prepared and mixed at 0.1, 0.2, and 0.3% by weight of the mortar. Mortar made with fine aggregate consisting of portland cement, sand, water, and eucalypt sodium-lignosulfonate gave cement setting time up to 500 minutes with a flow diameter of up to 18 cm, indicating satisfactory water dispersion. The mechanical characteristics of the mortar, in terms of flexural and compressive strength meet the ASIM designation of C109, C185, C230, and JIS R5201. Therefore, lignosulfonate derived from hardwood has the potential as a dispersant as compared to commercial NaLS derived from softwood lignin.
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