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Experimental and mesoscopic investigation on the dynamic properties of coral aggregate concrete in compression

Science China(Technological Sciences) 2021年第6期64卷 1153-1166页

作者： WU Zhang Yu ZHANG JinHua YU HongFa FANG Qin CHEN Li YUE ChengJun department of Civil and Airport Engineering Civil Aviation CollegeNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Engineering Southeast UniversityNanjing 210096China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education(ERCSPEIME) Southeast UniversityNanjing 211189China department of Civil Engineering Army Engineering University of PLANanjing 210007China

To investigate the dynamic responses and comprehending the damage mechanism of coral aggregate concrete(CAC) in compression, both the experimental and numerical investigations were implemented in the present work. Firstly, the dynamic mechanical properties of CAC at different strain rates were tested through the Split-Hopkinson pressure bar(SHPB) ***, the effects of concrete strength grade and strain rate on CAC were discussed and analyzed. Subsequently, we developed the three-dimensional(3d) random mesoscale model considering the randomness of aggregate shape, size and distribution at meso-level, which was validated and employed in the numerical simulation of CAC in compression. The results indicate that the splitting failure passing through the coral aggregate is CAC’S primary failure mode. It has been found that the failure pattern, deformation process, and dynamic increasing factor of CAC are associated with both the strain rate and concrete strength grade. Furthermore, by comparing the experimental and mesoscopic results, it has been proven to be reliable to employ the developed 3d mesoscale modelling method to simulate CAC’s dynamic performances, which has enormous potential in future research of CAC under intense dynamic loadings.

关键词： coral aggregate concrete 3d mesoscopic modelling SHPB strain rate dIF

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Three-dimensional mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size on the Splitting-Tensile Properties of Coral Aggregate Concrete

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Engineering 2022年第10期17卷 110-122页

作者： Zhangyu Wu Jinhua Zhang Hongfa Yu Qin Fang Haiyan Ma Li Chen department of Civil and Airport Engineering Civil Aviation CollegeNanjing University of Aeronautics and AstronauticsNanjing 210016China School of Civil Engineering Southeast UniversityNanjing 210096China Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education(ERCSPEIME) Southeast UniversityNanjing 211189China Army Engineering University of PLA Nanjing 210007China

The use of coral aggregate concrete(CAC)as a novel construction material has attracted significant attention for the construction of reef engineering *** investigate the static splitting-tensile behaviors of CAC under the influence of two factors,namely specimen geometry and bearing strip size,a three-dimensional(3d)mesoscale modeling approach with consideration for aggregate randomness in shape and distribution was adopted in this *** established 12 different specimen models with two specimen shapes(i.e.,a cube with an edge length of 150 mm and a cylinder with dimensions ofφ150 mm×300 mm)and six strip widths(i.e.,6,9,12,15,18,and 20 mm)for *** effects of specimen geometry and strip width on the splitting-tensile properties of CAC,such as failure processes,final failure patterns,and splitting-tensile strength(fst),are analyzed and discussed *** results indicate the high reliability of the developed mesoscale modeling approach and reveal the optimal computational parameters for simulating and predicting the splitting-tensile properties of *** fstvalues of CAC are associated with both the specimen geometry and width of the bearing *** fstvalues of the cube model are slightly higher than those of the cylinder model for the same bearing strip size,representing geometry effects that can be explained by differences in fracture ***,the fstvalue of CAC gradually increases with the relative width of the bearing strip ranging from 0.04 to *** on the elastic solution theory,the variation area of CAC fstvalues with the relative width of the bearing strip was determined preliminarily,which has great significance for studying the tensile performance of CAC.

关键词： Coral aggregate concrete 3d mesoscopic modelling Splitting-tensile test Tensile strength Specimen geometry Bearing strip

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