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<p>Burkina Faso has a large quantity of little-used tuff, and yet the country is faced with a crucial need for mineral binders to stabilize laterites whose geotechnical properties do not meet standards for use as a base course. The aim of this project is to develop a binder based on dolomitic tuff-lime mixtures that can be used to improve the usability properties of natural laterites. After a tuff physico-chemical and mineralogical characterization, its pozzolanic activity was assessed. Some pastes formulated in tuff/lime mass ratios (0.5, 1, 2) underwent mineralogical characterization after a treatment period time up to 180 days. The tuff studied is mainly composed of kaolinite, albite, montmorillonite, muscovite, goethite and quartz. As far as the tuff chemical composition is concerned, it is a pozzolan type N according to ASTM C 618 standard. Frattini and lime saturation tests showed that the tuff has a pozzolanic activity capable of binding more than 80 wt% lime after 28 days, with a pozzolanic index of 77%. The pastes mineralogical analysis showed the hydrates formation such as the calcium silicates hydrates (C-S-H), the monocarboaluminate (C<sub>4</sub>A<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="42247_2025_1107_Article_IEq1.gif" Format="GIF" Height="24" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\:\stackrel{-}{\text{C}}\)</EquationSource> </InlineEquation>H<sub>11</sub>) and the magnesium silicate hydrates (M-S-H). These hydrates resulting from the pozzolanic reaction between the tuff and dolomitic lime improve their mechanical properties. The hydrate content and the properties of the binders depend on the tuff/lime ratio (0.5, 1, 2), where higher ratios promote a more complete reaction, and on the curing time, with longer durations enhancing the formation of hydrated phases and improving mechanical properties. Taking into account the obtained results, the above tuff could be used as partial substitute of Portland cement in construction field.</p>

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Viability of dolomitic tuff-lime mixtures from Burkina Faso to produce an alternative binder material for the construction field

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Abdel Aziz Tinto,
  • Lohami Valentin Landry Gnoumou,
  • Issiaka Sanou,
  • Seick Omar Soré,
  • Adamah Messan,
  • Gilles Escadeillas,
  • Younoussa Millogo

摘要

Burkina Faso has a large quantity of little-used tuff, and yet the country is faced with a crucial need for mineral binders to stabilize laterites whose geotechnical properties do not meet standards for use as a base course. The aim of this project is to develop a binder based on dolomitic tuff-lime mixtures that can be used to improve the usability properties of natural laterites. After a tuff physico-chemical and mineralogical characterization, its pozzolanic activity was assessed. Some pastes formulated in tuff/lime mass ratios (0.5, 1, 2) underwent mineralogical characterization after a treatment period time up to 180 days. The tuff studied is mainly composed of kaolinite, albite, montmorillonite, muscovite, goethite and quartz. As far as the tuff chemical composition is concerned, it is a pozzolan type N according to ASTM C 618 standard. Frattini and lime saturation tests showed that the tuff has a pozzolanic activity capable of binding more than 80 wt% lime after 28 days, with a pozzolanic index of 77%. The pastes mineralogical analysis showed the hydrates formation such as the calcium silicates hydrates (C-S-H), the monocarboaluminate (C4A \(\:\stackrel{-}{\text{C}}\) H11) and the magnesium silicate hydrates (M-S-H). These hydrates resulting from the pozzolanic reaction between the tuff and dolomitic lime improve their mechanical properties. The hydrate content and the properties of the binders depend on the tuff/lime ratio (0.5, 1, 2), where higher ratios promote a more complete reaction, and on the curing time, with longer durations enhancing the formation of hydrated phases and improving mechanical properties. Taking into account the obtained results, the above tuff could be used as partial substitute of Portland cement in construction field.