TY - JOUR
T1 - Effect of addition time of a superplasticizer on cement adsorption and on concrete workability
AU - Hsu, Kung Chung
AU - Chiu, Jih Jen
AU - Chen, Sheng Da
AU - Tseng, Yuan Cheng
N1 - Funding Information:
The authors gratefully acknowledge the financial support of the National Science Council of The Republic of China, under Contract No. NSC-86-2211-E-003-001.
PY - 1999/12/1
Y1 - 1999/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0343081675&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0343081675&partnerID=8YFLogxK
U2 - 10.1016/S0958-9465(99)00030-X
DO - 10.1016/S0958-9465(99)00030-X
M3 - Article
AN - SCOPUS:0343081675
SN - 0958-9465
VL - 21
SP - 425
EP - 430
JO - Cement and Concrete Composites
JF - Cement and Concrete Composites
IS - 5-6
ER -