Understanding Ionic Dependence on the Water Absorption by Superabsorbent Polymer in Early Age Concrete

Author(s): Moon Juhyuk, Kang Sung-Hoon and Hong Sung-Gul
Paper category: Proceedings
Book title: Proceedings of International Conferences (ICACMS) Advances in Construction Materials and systems Vol 2
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN: 978-2-35158-194-0
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 42-47
Total Pages: 6
Language : English

Abstract: The effects of ion composition and concentration of cement-based solutions on the absorption and retention capacities of superabsorbent polymer (SAP) are investigated. The ion concentration history and SAP absorbency tests verify that the reduction of long-term swelling occurs from an irreversible ion exchange between Ca2+ and the anionic groups of SAP; thus, the Ca2+ concentration in a solution is a decisive factor for swelling reduction or
retention. Furthermore, this reduction is also highly dependent on the concentrations of the other ions in the solution. The retention capacity is improved as the total ion concentration (TIC), which is influenced by these concentrations, increases because a higher TIC indicates a weaker osmotic pressure, which reduces the maximum absorbency along with the effect of
the trapped Ca2+ in SAP. With the help of herein determined ionic factors for the prepared pore solutions, the complicated absorption and retention behaviors of SAP in concrete can be understood.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00