Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evaluation of Eco-friendly Concrete Release Agents Based on Bio-Waxes
https://orcid.org/http://orcid.org/0000-0002-4182-5653
https://orcid.org/http://orcid.org/0000-0002-3572-8873
The performance of mould release agent (MRA) has direct effect on the surface properties of concrete, and this eventually affects long-term durability. Currently, the most utilized MRA are from petroleum origin. But they are not eco-friendly and causes health hazard during application. Thus, eco-friendly bio-based wax emulsions are required. They have the potential to mimic the properties of petroleum-based releasing agents and thus could apply as mould-release agent that meets market requirements which has a low health risk and low climate impact. This work examined two bio-wax based MRA (F1 and F2) and compared their performance with commercial bio-based and petroleum-based MRA. The interfacial properties between MRA and formwork (steel, sawn wood and plywood) surfaces were evaluated using contact angle and surface tension measurements. Similarly, capacity of MRA to demould the concrete from formwork (steel and plywood) was measured using controlled tensile pull-off experiments. In addition, influence of MRA on surface appearance of concrete was analysed using image analysis and visual inspection of colour uniformity.
The results indicated that for plywood and steel, F2 MRA showed higher adhesion energy compared to F1 MRA suggesting F2 could have good applicability for vertical and horizontal formwork surfaces. Furthermore, F1 MRA and F2 MRA reduced adhesion for low alkaline cement concrete at steel and plywood surfaces, whereas for regular alkaline cement concrete, they effectively reduced adhesion at plywood surface compared to steel surfaces.
Evaluation of Eco-friendly Concrete Release Agents Based on Bio-Waxes
https://orcid.org/http://orcid.org/0000-0002-4182-5653
https://orcid.org/http://orcid.org/0000-0002-3572-8873
The performance of mould release agent (MRA) has direct effect on the surface properties of concrete, and this eventually affects long-term durability. Currently, the most utilized MRA are from petroleum origin. But they are not eco-friendly and causes health hazard during application. Thus, eco-friendly bio-based wax emulsions are required. They have the potential to mimic the properties of petroleum-based releasing agents and thus could apply as mould-release agent that meets market requirements which has a low health risk and low climate impact. This work examined two bio-wax based MRA (F1 and F2) and compared their performance with commercial bio-based and petroleum-based MRA. The interfacial properties between MRA and formwork (steel, sawn wood and plywood) surfaces were evaluated using contact angle and surface tension measurements. Similarly, capacity of MRA to demould the concrete from formwork (steel and plywood) was measured using controlled tensile pull-off experiments. In addition, influence of MRA on surface appearance of concrete was analysed using image analysis and visual inspection of colour uniformity.
The results indicated that for plywood and steel, F2 MRA showed higher adhesion energy compared to F1 MRA suggesting F2 could have good applicability for vertical and horizontal formwork surfaces. Furthermore, F1 MRA and F2 MRA reduced adhesion for low alkaline cement concrete at steel and plywood surfaces, whereas for regular alkaline cement concrete, they effectively reduced adhesion at plywood surface compared to steel surfaces.
Evaluation of Eco-friendly Concrete Release Agents Based on Bio-Waxes
https://orcid.org/http://orcid.org/0000-0002-4182-5653
https://orcid.org/http://orcid.org/0000-0002-3572-8873
The performance of mould release agent (MRA) has direct effect on the surface properties of concrete, and this eventually affects long-term durability. Currently, the most utilized MRA are from petroleum origin. But they are not eco-friendly and causes health hazard during application. Thus, eco-friendly bio-based wax emulsions are required. They have the potential to mimic the properties of petroleum-based releasing agents and thus could apply as mould-release agent that meets market requirements which has a low health risk and low climate impact. This work examined two bio-wax based MRA (F1 and F2) and compared their performance with commercial bio-based and petroleum-based MRA. The interfacial properties between MRA and formwork (steel, sawn wood and plywood) surfaces were evaluated using contact angle and surface tension measurements. Similarly, capacity of MRA to demould the concrete from formwork (steel and plywood) was measured using controlled tensile pull-off experiments. In addition, influence of MRA on surface appearance of concrete was analysed using image analysis and visual inspection of colour uniformity.
The results indicated that for plywood and steel, F2 MRA showed higher adhesion energy compared to F1 MRA suggesting F2 could have good applicability for vertical and horizontal formwork surfaces. Furthermore, F1 MRA and F2 MRA reduced adhesion for low alkaline cement concrete at steel and plywood surfaces, whereas for regular alkaline cement concrete, they effectively reduced adhesion at plywood surface compared to steel surfaces.
Evaluation of Eco-friendly Concrete Release Agents Based on Bio-Waxes
RILEM Bookseries
Jędrzejewska, Agnieszka (Herausgeber:in) / Kanavaris, Fragkoulis (Herausgeber:in) / Azenha, Miguel (Herausgeber:in) / Benboudjema, Farid (Herausgeber:in) / Schlicke, Dirk (Herausgeber:in) / Chaudhari, Ojas (Autor:in) / Zirgulis, Giedrius (Autor:in) / Taha, Isra (Autor:in) / Tryggö, Dag (Autor:in)
International RILEM Conference on Synergising expertise towards sustainability and robustness of CBMs and concrete structures ; 2023 ; Milos Island, Greece
11.06.2023
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
British Library Online Contents | 2005
Evaluation of technical performance of concrete vegetable oil based release agents
| British Library Online Contents | 2000
Comparison of different waxes as processing agents for low-density polyethylene
| British Library Online Contents | 2006
Environmentally sound concrete release agents
| Online Contents | 2000