Role of Lignosulfonates as Superplasticizers


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Title: Role of Lignosulfonates as Superplasticizers

Author(s): M. R. Rixom and J. Waddicor

Publication: Special Publication

Volume: 68


Appears on pages(s): 359-380

Keywords: admixtures; air entrainment; compressive strength; drying shrinkage; heat of hydration; lignin and derivatives; lignosulfonate; mechanical properties; mix proportioning; physical properties; plasticizers; water-reducing agents; workability.

Date: 1/1/1981

The paper describes the assessment and application of the Tattersall two point workability test and a multipoint heat of hydration apparatus in a research project to develop a super-plasticizer based on lignosulphonates. The significance of vari-ables such as ionic type, molecular weight, and degree of sulpho-nation is presented. The application of these variables to produce a suitable lignosulphonate has resulted in a superplasti-cizer which is compared with melamine and naphthalene based pro-ducts. The paper concludes that a superplasticizer based on the new lignosulphonate material is suitable for the production of flowing concrete in terms of dosage requirement, workability extension, price, and compressive strength development.