Abstract
Commercial wheat straw soda lignin was used to develop an
alkali-O2oxidation method to produce a ready-to-use
solution for concrete plasticizing (cement dispersing).
Lignin characterization was done directly from the
solution. Depending on conditions, oxidation primarily
induced either condensation or degradation of lignin.
Thus, both the negative charge and the molar mass of the
lignin were controlled by the oxidation parameters, and
especially by pH. The oxidized lignins were evaluated for
their plasticizing performance in cement pastes, mortar,
and concrete. Also, their effect on cement hydration was
followed and several other properties of fresh andmatured
concrete were tested. A commercial lignosulfonate and
petroleum-based superplasticizers were used as reference
products.The results indicated that alkali-O2oxidation at
moderately high lignin dry solids is a promising methodto
produce a novel bio-based concrete plasticizer. The
oxidized lignins were superior to the lignosulfonate and
showed good performance in comparison to the
superplasticizers.
Original language | English |
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Pages (from-to) | 150-157 |
Journal | Industrial Crops and Products |
Volume | 74 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | A1 Journal article-refereed |
Keywords
- cement
- concrete
- soda lignin
- oxidation
- oxygen
- plasticizera