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Open Access Mechanical property variation under dynamic uniaxial compression and micro-mechanism of lamprophyre in saturated state

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In order to understand the softening characteristics and micro-mechanism of lamprophyre in water,the uniaxial compression experiments,water absorption test,X-ray diffraction and scanning electron microscope analysis were conducted,which reveals the mechanical characteristics,water-absorption capability,mineral composition and microstructures of lamprophyre at different saturated states (0,15 and 30 d).The results show that comparing with lamprophyre specimen without soaking in water,the uniaxial compressive strength of that soaking in water for 15 days and 30 days decrease from 121.56 MPa to 80.85 MPa and 70.34 MPa respectively.The feature of stress-strain curve varies at different saturated states.During the water-absorptional progress of lamprophyre,the variation of water-absorption followed as the exponent distribution.Meanwhile,the micro structure of mineral aggregation and its relative content change obviously.The particles of mineral aggregates in lamprophyre involve in the reaction with water and the connection between particles will be destroyed.Thus,the water will react with the mineral particles.Due to the numerous micro-pores and the stress raisers,the mineral aggregates that play the role of skeleton will peel off.subsequently the inner construction of lamprophyre will be destroyed and its mechanical properties of it will be changed.In a word,the microstructure mineral collection is damaged,which actually lead to the change of lamprophyre’s mechanical properties.It is also the key reason of lamprophyre’s softening.There is a closed relationship between softening phenomenon and hydration reaction.
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Keywords: lamprophyre; mechanical property; micro-mechanism; water-rock reaction

Document Type: Research Article

Publication date: February 15, 2015

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