on November 12th, 2016

An experimental research was conducted with the objectives to study the effects silanes (amino, vinyl, and epoxy-based) and their derivatives (silane oligomers and silane nanoparticles) on cement hydration and mechanical properties of mortars.

Silanes and silane derivatives are used as coupling agents to combine different compositions in mortars and to chemically react with calcium silicate hydrates to introduce organic component into CH structure.

The use of silanes retarded the cement hydration. However, silane derivatives were found to effectively mitigate the retardation.

Liquid-state 29Si nuclear magnetic resonance (NMR) spectroscopy indicated that silanes and silane derivatives have different hydrolysis and condensation products in the solutions of cement pastes.

Further analysis of silicon concentration in the solution indicated that the hydrolysis and condensation products of silane oligomer is opt to be in the solution, instead of adsorption onto the surface of cement hydration products, to retard the cement hydration.

Ordinary mortars with the silanes and silane derivatives showed general enhancement in flexural strength and some improvement in compressive strength after curing for 7 days and 28 days.

Due to good strength properties, negligible hydration retardation, and simple preparation method, epoxy-based silane oligomer was selected for further study in high-strength mortar.

Results indicated that the compressive strength, splitting tensile strength, and elastic modulus of the high-strength mortar were increased by 20%, 38%, and 13%, respectively, compared with the control mortar.

Read More

The latest news

EIT News

A Hero with a Lifesaving Legacy  

Meet James Mackay, the Technology Manager at the Engineering Institute of Technology (EIT), also known as a hero. His journey is nothing short of inspiring, and it's about time the... Read more
EIT News

UAE Floods: Role of Engineers in Cloud Seeding and Climate

The recent downpour in Dubai has raised the question of whether cloud seeding or extreme weather was to blame and what engineering is involved in either scenario. The recent downpour... Read more
EIT News

3D Printing: Technology, Applications, and Future Prospects 

In this insightful blog, we investigate the transformative field of additive manufacturing.   The Engineering Institute of Technology’s (EIT) senior Mechanical Engineering on-campus lecturer and the Doctor of Engineering Research Coordinator, Dr. Vishal... Read more
Engineering Institute of Technology