SYMPOSIA PAPER Published: 01 January 1960

Detection of Lignosulfonate Retarder in Cement Suspensions and Pastes


The problem of detecting the presence of the lignosullonate type of retarder or plasticizer in hardened cement paste is investigated by a spectrophotometric method based on ultraviolet absorbance measurements of aqueous extracts. The interaction of hydrating portland cement and lignosulfonate salt, whether in water suspension or in hardened paste, results in the disappearance of the characteristic 280 mμ maximum of the original lignosulfonate and the appearance of two new maxima at wavelengths of 245 and 350 mμ. This change is attributed to alkaline hydrolysis, with the formation of vanillin. The experimental results are discussed in relation to the qualitative and quantitative aspects of the method in detecting lignosulfonates in portland-cement products.

Author Information

Swenson, EG
Miron and Frères Ltd., Montreal, P. Q.
Thorvaldson, T
University of Saskatchewan, Saskatoon, Sask.
Price: $25.00
Contact Sales
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Developed by Committee: C01
Pages: 159–169
DOI: 10.1520/STP39574S
ISBN-EB: 978-0-8031-5648-7
ISBN-13: 978-0-8031-5647-0