Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Novel low-cost shrinkage-compensating admixture for ordinary Portland cement
Highlights The low-cost SCA is composed of an Al-rich waste and gypsum. The Al-rich waste is a reactive source of aluminum hydroxide. The SCA act as a precursor of ettringite. The formation and growth of ettringite is the key to the expansive behavior of cement.
Abstract This work proposes a low-cost and eco-friendly shrinkage-compensating admixture (SCA) composed of an Al-rich waste and calcium sulfate for cement-based binders. The hydration process and microstructural changes of cement pastes with the proposed SCA were investigated by means of isothermal conduction calorimetry, X-ray diffraction, differential thermal and thermogravimetry analysis, elastic modulus and compressive strength tests for several hydration times. Length changes were also followed for 7 days. The main results revealed that the cement pastes with the proposed SCA expand between the first and third day of hydration enough to mitigate the shrinkage of cement pastes. SEM micrographs and X-ray patterns suggest that the expansion is managed through the nucleation and growth of needle-like crystals of ettringite.
Novel low-cost shrinkage-compensating admixture for ordinary Portland cement
Highlights The low-cost SCA is composed of an Al-rich waste and gypsum. The Al-rich waste is a reactive source of aluminum hydroxide. The SCA act as a precursor of ettringite. The formation and growth of ettringite is the key to the expansive behavior of cement.
Abstract This work proposes a low-cost and eco-friendly shrinkage-compensating admixture (SCA) composed of an Al-rich waste and calcium sulfate for cement-based binders. The hydration process and microstructural changes of cement pastes with the proposed SCA were investigated by means of isothermal conduction calorimetry, X-ray diffraction, differential thermal and thermogravimetry analysis, elastic modulus and compressive strength tests for several hydration times. Length changes were also followed for 7 days. The main results revealed that the cement pastes with the proposed SCA expand between the first and third day of hydration enough to mitigate the shrinkage of cement pastes. SEM micrographs and X-ray patterns suggest that the expansion is managed through the nucleation and growth of needle-like crystals of ettringite.
Novel low-cost shrinkage-compensating admixture for ordinary Portland cement
Tramontin Souza, Marcelo (Autor:in) / Onghero, Lucas (Autor:in) / Nunes Correa, Bruna (Autor:in) / Selhorst, Maria Angélica (Autor:in) / Miranda Dias, Ariely (Autor:in) / Longuini Repette, Wellington (Autor:in) / Raupp Pereira, Fabiano (Autor:in) / Novaes de Oliveira, Antonio Pedro (Autor:in)
16.09.2019
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
| Europäisches Patentamt | 2024
Drying shrinkage of ordinary portland cement pastes
| Tema Archiv | 1989
High performance shrinkage-compensating pc grout admixture
| British Library Conference Proceedings | 1996
| British Library Conference Proceedings | 1999