Effect of Side Chain Length Change of Polycarboxylate-Ether–Based High-Range Water–Reducing Admixture on Properties of Cementitious Systems Containing Fly Ash
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 4
Abstract
In this study, the effect was investigated of side chain length changes of polycarboxylate-ether–based high-range water–reducing (HRWR) admixture on fresh properties, compressive strength, and water adsorption capacity of cementitious systems. For this aim, three HRWR admixtures having same raw materials, anionic/nonionic group ratio, free nonionic group content, and main chain length but different side chain length and molecular weight were synthesized. The effect was investigated of the mentioned admixtures on the properties of mixtures containing 0%, 15%, 30%, and 45% of fly ash. According to the test results, regardless of fly ash utilization ratio, the flowability of the mixtures was positively affected with the increase of the water-reducing admixture side chain length to a certain value. However, utilization of admixtures having the longer side chain length than a certain value adversely affected the flow properties of the mixtures. It is thought that this situation is due to the reduction of the admixture efficiency (steric effect) by increasing the possibility of intertwining of polymers of admixture having higher side chain length. The admixture with of side chain molecular weight (length) showed the best performance in terms of fresh properties. The change of HRWR admixture properties had no significant effect on the strength and water adsorption capacity of the mixtures. Moreover, regardless of HRWR admixture properties, the time-dependent flowability of the mixtures was adversely affected and the water adsorption capacity was decreased with the utilization of fly ash. This effect was more pronounced with increasing replacement ratio of fly ash.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors appreciate contributions of the Scientific and Technological Research Council of Turkey (TUBITAK) and Bursa Uludag University Science and Technology Centre (BAP) under Grant Nos. 219M425, AYP(MH)-2016/16, DDP(MH)-2018/9, and DDP(MH)-2019/15. In addition, the second author would like to acknowledge the scholarship provided by TUBITAK under Grant No. 217M408 during his Ph.D. study. In addition, the authors would like to thank Polisan Construction Chemicals Company and Bursa-Beton Ready Mixed Concrete Plant authorities for their kind assistance in providing the cement, aggregate, and water-reducing admixture as well as determining the chemical composition and physical and mechanical properties of these products.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Jul 9, 2019
Accepted: Aug 4, 2020
Published online: Jan 20, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 20, 2021
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