Study of water dispersible PU/C-S-H nanostructure hybrid materials

Title: Study of water dispersible PU/C-S-H nanostructure hybrid materials
Author(s): B. Ding, W.R. Tang, D.L. Zhou, C.W. Miao
Paper category : conference
Book title: International RILEM Conference on Advances in Construction Materials Through Science and Engineering
Editor(s): Christopher Leung and K.T. WAN
ISBN: 978-2-35158-116-2
e-ISBN: 978-2-35158-117-9
Publisher: RILEM Publications SARL
Publication year: 2011
Pages: 162 - 174
Total Pages: 13
Nb references: 18
Language: English

Abstract: Waterborne polyurethane dispersions (PU) with high alkaline resistance are designed to improve the toughness of concrete based on Interactions between aqueous polyurethanes and calcium silicate hydrates(C-S-H). The polymers were characterized by Fourier transform infrared spectrometry (FTIR). The improvement in alkali resistance was demonstrated by dynamic and static light scattering (DLS and LLS) when the pH of the solution media was changed from 8 to above 13. The results demonstrate that modification by PA was an effective way in which to improve the stability of PU in a strong alkaline environment. The 29Si MAS-NMR spectra indicate that there is a significant increase in the length of the silicate chains ranging from 3.0 for pure C-S-H to 6.4 for PUA-C-S-H. It would appear that the for PUA-C-S-H nanocomposites both intercalation and grafting of the surface of the silicate sheets may occur. The influence of water dispersible PU on workability and mechanical performance of concrete were studied experimentally. The results show that fracture energy ratios of concrete with PU polymer has been greatly improved more than double with the harmless of the concrete strength.

Online publication: 2011-10-31
Publication type : full_text
Public price (Euros): 0.00