Abstract
In order to improve the mechanical properties of rock with lots of cracks, this study adopts electronic methods (X-ray diffraction and scanning electron microscopy) to determine the mineral compositions and micro structural characteristics of epoxy-repaired rock. Fractured rocks with low strength or high permeability may not be appropriate for dam foundation. The strength and durability of fractured rock are increased after chemical grouting. Test results show that, some of the cracks and voids are repaired by epoxy particles, resulted in the decreasing rock porosity. The proportion of epoxy resins is about 3.5%-5.5%, showing a discrete distribution and can not connect with each other.
Highlights
Rock contains lots of cracks, the mechanical properties of rock are influenced by these cracks and the cracks may represent the total extent of the damage (Issa and Debs, 2009; Zhou et al, 2012)
Epoxy resins are widely used in chemical grouting of rock due to their advantageous properties of adhesion, good toughness and superior mechanical properties (Rogers and Daniels, 2002; Hasanpour and Choupani, 2009)
Sample preparation: The epoxy-repaired rock should be pressed into powder for XRays Diffraction (XRD) test, the particle diameter is less than 0.001 mm
Summary
Rock contains lots of cracks, the mechanical properties of rock are influenced by these cracks and the cracks may represent the total extent of the damage (Issa and Debs, 2009; Zhou et al, 2012). The scanning electron microscope (SEM) is a powerful tool for micro structural analysis of epoxy-repaired rock. The mineral proportions and micro structural properties of epoxy-repaired rock are very important to determine the improvement of mechanical characteristics by epoxy resins.
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