Effect of addition time of a superplasticizer on cement adsorption and on concrete workability

Kung Chung Hsu, Jih Jen Chiu, Sheng Da Chen, Yuan Cheng Tseng

Research output: Contribution to journalArticlepeer-review

64 Citations (Scopus)


The effect of addition time of a naphthalene-based superplasticizer (SNF) on the adsorption behavior on type I Portland cement slurries and on the concrete workability was studied. Test results indicate that the adsorption behavior of SNF on cement particles follows a Langmuir isothermal adsorption model. As the addition time increases, the saturated adsorption amount of SNF decreases sharply at the beginning and then more slowly. In comparison, the concrete workability decreases slightly in the early phase and then falls off abruptly. Most importantly, the transition points in both cases appear to be the same, at about 10-15 min. This strongly suggests that a close relationship exists between the SNF adsorption behavior on cement particles and the workability of concrete. In addition, the optimum addition time of SNF to concrete should be in this period, which corresponds to the beginning of the dormant period of the cement hydration process.

Original languageEnglish
Pages (from-to)425-430
Number of pages6
JournalCement and Concrete Composites
Issue number5-6
Publication statusPublished - 1999 Dec 1

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science


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