Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Potential use of activated Algerian natural pozzolan powder as a cement replacement material
The purpose of this experimental work is to develop a suitable approach for an alkali-activated binder material to replace cement CEM-II/42.5 by 80% of natural pozzolan. The chemical activity of silica and alumina found in Algeria's natural pozzolan is improved using heat treatment and chemical curing, together with several alkali activators, including a 6-mole NaOH and a 6-mole KOH along with CaCl2, Na2SO4 and Na2SiO3. The chemical and morphological processes are monitored using X-ray diffraction, TGA and DTA, as well as particle size distribution analyses. Laboratory tests show that thermal pretreatment positively affects the compressive strength; moreover, the use of 6% Na2SiO3 and 6% Na2SO4 results in increased short-term and long-term compressive strength, respectively. Optimal compressive strength values are reached under chemical activation and thermal pretreatment processes. These combined processes also affect Young's modulus values and the relative deformations caused by ultimate stresses. This experimental work highlights the potential of natural pozzolan in producing an economical and environmentally-friendly sustainable material that can be substituted for Portland cements and used in multiple engineering applications.
Potential use of activated Algerian natural pozzolan powder as a cement replacement material
The purpose of this experimental work is to develop a suitable approach for an alkali-activated binder material to replace cement CEM-II/42.5 by 80% of natural pozzolan. The chemical activity of silica and alumina found in Algeria's natural pozzolan is improved using heat treatment and chemical curing, together with several alkali activators, including a 6-mole NaOH and a 6-mole KOH along with CaCl2, Na2SO4 and Na2SiO3. The chemical and morphological processes are monitored using X-ray diffraction, TGA and DTA, as well as particle size distribution analyses. Laboratory tests show that thermal pretreatment positively affects the compressive strength; moreover, the use of 6% Na2SiO3 and 6% Na2SO4 results in increased short-term and long-term compressive strength, respectively. Optimal compressive strength values are reached under chemical activation and thermal pretreatment processes. These combined processes also affect Young's modulus values and the relative deformations caused by ultimate stresses. This experimental work highlights the potential of natural pozzolan in producing an economical and environmentally-friendly sustainable material that can be substituted for Portland cements and used in multiple engineering applications.
Potential use of activated Algerian natural pozzolan powder as a cement replacement material
Nourredine, Goufi (Autor:in) / Kerdal, Djamel Elddine (Autor:in) / Nouria, Kaid (Autor:in) / Rachida, Idir (Autor:in)
European Journal of Environmental and Civil Engineering ; 25 ; 967-987
01.04.2021
21 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
| NTIS | 1979
Alkali-Activated Natural Pozzolan Concrete as New Construction Material
| Online Contents | 2013
Alkali-Activated Natural Pozzolan Concrete as New Construction Material
| British Library Online Contents | 2013