Damage of rubber concrete under impact loads

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (17) : 73-80.

HAO Yunhong1，2,FAN Lei1, HAN Yan1, LI Hui1, TIAN Xule1, HAO Qingli1,2

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Abstract

Aiming at damage problems of rubber concrete under impact loads, an automatic impact ball pressure instrument was used to study dynamic impact damage behavior of rubber concrete.Morphology and mechanism features of impact damage were analyzed with a laser scanning confocal microscopy (LSCM) and a scanning electron microscope (SEM).Results showed that impact resistance ability of rubber concrete under impact loads is stronger than that of normal concrete, and its impact resistance ability is enhanced with decrease in rubber particle diameter; with continuous increase in impact loads, indentation growth rate of rubber concrete is smaller than that of normal concrete, while its ultimate load value is larger than that of normal concrete; with decrease in rubber particle diameter, its indentation growth rate tends to decrease, while its ultimate load value increases, and its anti-plastic deformation ability and its specimen surface’s dynamic performance are enhanced; under impact loads, coronal pits are formed on its surface, different degrees of material accumulation appear at indentation edges, 80-mesh rubber is distributed more uniformly in concrete, and damage zones are more continuous and there are no obvious micro-cracks; the results provide a basis for studying damage of rubber concrete under impact loads.

Key words

impact load / damage mechanism / sphere impact / rubberized concrete / indentation morphology

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HAO Yunhong1，2,FAN Lei1, HAN Yan1, LI Hui1, TIAN Xule1, HAO Qingli1,2. Damage of rubber concrete under impact loads[J]. Journal of Vibration and Shock, 2019, 38(17): 73-80

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