Alkali-O2 oxidized lignin: A bio-based concrete plasticizer

A. Kalliola (Corresponding Author), Tapio Vehmas, T. Liitiä, T. Tamminen

    Research output: Contribution to journalArticleScientificpeer-review

    26 Citations (Scopus)

    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 languageEnglish
    Pages (from-to)150-157
    JournalIndustrial Crops and Products
    Volume74
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Keywords

    • cement
    • concrete
    • soda lignin
    • oxidation
    • oxygen
    • plasticizera

    Fingerprint

    Dive into the research topics of 'Alkali-O2 oxidized lignin: A bio-based concrete plasticizer'. Together they form a unique fingerprint.

    Cite this