In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Effect of Modifications of Lignosulfonate on Adsorption on Cement and Fresh Concrete Properties
Author(s): K. Reknes and J. Gustafsson
Publication: Special Publication
Appears on pages(s): 127-142
Keywords: adsorption; concrete (fresh); rheology
Abstract:Lignosulfonate has a long history as plasticizers in concrete. This paper reports an investigation of the effect of ultrafiltration of lignosulphonate on rheological properties of concrete with two different modified lignosulfonates. It is shown how the modification also changes the adsorption of the lignosulfonate on the cement and the effect this has on the properties of the fresh concrete. The workability of the concrete is different for the lignosulfonates tested, however, true differences in workability are only observed by the applied rheological approach. The rheological measurements reveal differences in terms of plastic viscosity. Modifications of the lignosulfonate change the performance of the lignosulfonate as a plasticizing admixture. Increased molecular weight and purity of the lignosulfonate increase the plasticizing effect and also improve the ability of the lignosulfonate to reduce the viscosity of the concrete. The viscosity reduction is for a high molecular weight lignosulfonate efficient even at very low dosages. Increasing the molecular weight and purity of the lignosulfonate also reduce the concrete set retardation. High molecular weight lignosulfonate is because of the viscosity and yield value reduction an effective material for formulation of a plasticizing admixture.
Click here to become an online Journal subscriber