Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Technologies  > Silica-based self-healing microcapsules fo...

Monday, 16 September 2019
pdf
Raw materials & technologies, Technologies

Silica-based self-healing microcapsules for self-repair in concrete

Wednesday, 9 December 2015

Reseachers fabricated new self-healing material for concrete repair through microencapsulation of silica sol via interfacial polymerisation of poly(urea-urethane).

New self-healing material for concrete repair has been fabricated through microencapsulation of silica sol. Source: Rainer Sturm/pixelio.de

New self-healing material for concrete repair has been fabricated through microencapsulation of silica sol. Source: Rainer Sturm/pixelio.de

Smooth, uniform, and spherical capsules of 60–120 µm sizes were synthesised and optimised by studying the emulsification and polymerisation steps of its synthesis.

Industrial scale-up is highly possible

A hydrophile-lyophile balance (HLB) value of 3.0–5.0 and a rotational speed of 500 rpm were necessary to produce a stable emulsion system of silica sol in surfactants. The polymerisation speed of 900 rpm and the methylene diisocyanate (MDI) monomer content of 15 wt % were both significant in getting the right size and smoothness of the microcapsules. With this method and cheap healing agents, industrial scale-up is highly possible. The viscoelastic properties of the microcapsules were examined, and further characterizations were carried out through scanning electron microscopy, energy dispersive X-ray spectroscopy, and Fourier transform infrared spectroscopy. After healing the microcracks in concrete, the results showed that the significant increase of compressive and bending strengths manifested the self-healing ability of the microcapsules in concrete.

The study is published in: Journal of Applied Polymer Science.

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register