A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Microstructure, geotechnical and mechanical characteristics of quicklime-lateritic gravels mixtures used in road construction
Highlights ► Highlight the effects of quicklime on microstructural, geotechnical and mechanical characteristics of lateritic gravels. ► The CSH formed provided the pozzolanic reaction between a part of kaolinite and hydrated quicklime. ► Appreciable improvement of mechanical properties was obtained with CSH formation for quicklime amount ⩽3wt.%. ► The obtained mixes are convenient for base course in road construction.
Abstract Microstructure of quicklime-lateritic gravels mixes, containing up to 8wt.% quicklime, was investigated by using X-ray diffraction, infrared spectrometry, differential thermal analysis, scanning electron microscopy and energy dispersive spectrometry. Geotechnical and mechanical properties of the mixtures were also measured. Quicklime additions resulted of reduction of clayey fraction, plasticity index, methylene blue value and maximum dry density and the increasing of optimum moisture content. The results showed also that quicklime admixtures resulted in the formation of calcium silicate hydrate type I (C–S–H (I)), portlandite and calcite. This CSH (I) was formed through the pozzolanic reaction between a part of the kaolinite and hydrated lime in the basic medium. Moreover, C–S–H (I) marked crystallization with curing time and observed for the quicklime amounts (⩽3wt.%), contributed to the improvement of mechanical properties. These lime modified lateritic gravels are convenient for base course in road geotechnical applications.
Microstructure, geotechnical and mechanical characteristics of quicklime-lateritic gravels mixtures used in road construction
Highlights ► Highlight the effects of quicklime on microstructural, geotechnical and mechanical characteristics of lateritic gravels. ► The CSH formed provided the pozzolanic reaction between a part of kaolinite and hydrated quicklime. ► Appreciable improvement of mechanical properties was obtained with CSH formation for quicklime amount ⩽3wt.%. ► The obtained mixes are convenient for base course in road construction.
Abstract Microstructure of quicklime-lateritic gravels mixes, containing up to 8wt.% quicklime, was investigated by using X-ray diffraction, infrared spectrometry, differential thermal analysis, scanning electron microscopy and energy dispersive spectrometry. Geotechnical and mechanical properties of the mixtures were also measured. Quicklime additions resulted of reduction of clayey fraction, plasticity index, methylene blue value and maximum dry density and the increasing of optimum moisture content. The results showed also that quicklime admixtures resulted in the formation of calcium silicate hydrate type I (C–S–H (I)), portlandite and calcite. This CSH (I) was formed through the pozzolanic reaction between a part of the kaolinite and hydrated lime in the basic medium. Moreover, C–S–H (I) marked crystallization with curing time and observed for the quicklime amounts (⩽3wt.%), contributed to the improvement of mechanical properties. These lime modified lateritic gravels are convenient for base course in road geotechnical applications.
Microstructure, geotechnical and mechanical characteristics of quicklime-lateritic gravels mixtures used in road construction
Millogo, Younoussa (author) / Morel, Jean-Claude (author) / Traoré, Karfa (author) / Ouedraogo, Raguilnaba (author)
Construction and Building Materials ; 26 ; 663-669
2011-06-18
7 pages
Article (Journal)
Electronic Resource
English
| British Library Online Contents | 2012
Cement-lateritic gravels mixtures: Microstructure and strength characteristics
| Online Contents | 2008