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<p>Sub-Saharan countries face significant challenges in road infrastructure development due to limited financial resources and insufficient maintenance of existing networks. The construction of high-quality, durable road structures remains financially burdensome for these countries. This study investigates the potential improvement of the geotechnical and mechanical properties of a lateritic clay (ALB) from Burkina Faso through the addition of dolomitic lime and metakaolin, aiming to develop cost-effective materials for road construction. The ALB lateritic clay was modified by incorporating 2, 4 and 5 wt% dolomitic lime, both individually and in combination with 2 and 3 wt% metakaolin. The composites were evaluated for their microstructural, mineralogical, geotechnical and mechanical properties. The results indicated that the addition of dolomitic lime and metakaolin promoted the formation of new mineral phases, including calcite, portlandite, Calcium Silicate Hydrate (CSH) and Magnesium Silicate Hydrate (MSH). Among the formulations, the mixture labelled <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({\text{M}}_{53}\)</EquationSource> </InlineEquation>, combining dolomitic lime and metakaolin exhibited a more homogeneous microstructure. Furthermore, the incorporation of dolomitic lime and metakaolin increased the maximum dry density and reduced the optimum water content of the composites. While the addition of dolomitic lime alone resulted in a decrease in the Californian Bearing Ratio (CBR) index; the lime-metakaolin mixture significantly improved this mechanical property. The mechanical strength of the composites increased with curing time, with the <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({\text{M}}_{53}\)</EquationSource> </InlineEquation> formulation demonstrating the best performance, attributed to the enhanced pozzolanic reaction facilitated by the amorphous silica present in metakaolin. The compressive strength (CS) of the M53 composite reaches 3.3 MPa and 4.5 MPa after 7 and 28 days of curing, respectively. This composite had a CBR bearing capacity of 92%. Based on these findings, the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\({\text{M}}_{53}\)</EquationSource> </InlineEquation> composite is recommended as a suitable and promising material for use as a base course in road construction projects in Burkina Faso.</p>

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Improving the geotechnical and mechanical characteristics of a lateritic clay in sustainable road construction: Optimised incorporation of dolomitic lime and metakaolin

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Souleymane Sanou,
  • Lohami Valentin Landry Gnoumou,
  • Halidou Bamogo,
  • Issiaka Sanou,
  • Abdel Aziz Tinto,
  • Jean-Emmanuel Aubert,
  • Younoussa Millogo

摘要

Sub-Saharan countries face significant challenges in road infrastructure development due to limited financial resources and insufficient maintenance of existing networks. The construction of high-quality, durable road structures remains financially burdensome for these countries. This study investigates the potential improvement of the geotechnical and mechanical properties of a lateritic clay (ALB) from Burkina Faso through the addition of dolomitic lime and metakaolin, aiming to develop cost-effective materials for road construction. The ALB lateritic clay was modified by incorporating 2, 4 and 5 wt% dolomitic lime, both individually and in combination with 2 and 3 wt% metakaolin. The composites were evaluated for their microstructural, mineralogical, geotechnical and mechanical properties. The results indicated that the addition of dolomitic lime and metakaolin promoted the formation of new mineral phases, including calcite, portlandite, Calcium Silicate Hydrate (CSH) and Magnesium Silicate Hydrate (MSH). Among the formulations, the mixture labelled \({\text{M}}_{53}\) , combining dolomitic lime and metakaolin exhibited a more homogeneous microstructure. Furthermore, the incorporation of dolomitic lime and metakaolin increased the maximum dry density and reduced the optimum water content of the composites. While the addition of dolomitic lime alone resulted in a decrease in the Californian Bearing Ratio (CBR) index; the lime-metakaolin mixture significantly improved this mechanical property. The mechanical strength of the composites increased with curing time, with the \({\text{M}}_{53}\) formulation demonstrating the best performance, attributed to the enhanced pozzolanic reaction facilitated by the amorphous silica present in metakaolin. The compressive strength (CS) of the M53 composite reaches 3.3 MPa and 4.5 MPa after 7 and 28 days of curing, respectively. This composite had a CBR bearing capacity of 92%. Based on these findings, the \({\text{M}}_{53}\) composite is recommended as a suitable and promising material for use as a base course in road construction projects in Burkina Faso.