养护湿度对橡胶水泥砂浆动态压缩破坏特征及能量耗散的影响

doi:10.11896/cldb.19060039

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Abstract To explore the effect of curing humidity on dynamic compressive failure characteristics and energy dissipation of rubber cement mortar, the split Hopkinson pressure bar (SHPB) tests of rubber cement mortar under 95% and 50% relative humidity curing were carried out. The results show that the specific energy absorption value of the specimens is a linear positive correlation with the incident energy and strain rate. Although increasing the rubber content will reduce the specific energy absorption value, it will significantly increase the average fragment size/decrease the fractal dimension. Reducing curing humidity will significantly reduce the specific energy absorption value and decrease the average fragment size/increase the fractal dimension, but with the increase of strain rate, the difference of the average fragment size and fractal dimension under dry and wet curing gradually decreases. When the specific energy absorption value is 1.0, the fragment size/fractal dimension of the specimens in each group has the smallest difference, mainly distributed in 10—25 mm/(1.85—2.20). When the incident energy is 600—800 J, the fragment size and fractal dimension distribution of the specimens are relatively concentrated. By discussing and analyzing the mechanism of the energy dissipation of rubber particles in the sample of the SHPB test, it was proved that rubber cement mortar has good impact cracking resis-tance. Through the discussion and analysis of the different energies accompanied by the experiment, it was explained that at the same incident energy level, due to the addition of rubber particles and the reduction of curing humidity, the reflected energy ratio increases, the transmitted energy ratio and the failure energy ratio decreases.

Key words： curing humidity rubber cement mortar split Hopkinson pressure bar (SHPB) specific energy absorption value compressive fai-lure wave impedance

Published: 14 July 2020

CLC number:

TB332

Fund:This work was financially supported by the National Natural Science Foundation of China (51728201).

About author:: Rongzhou Yang, a doctoral candidate, Anhui University of Science and Technology, is mainly engaged in the study of mechanical properties, energy and explosion shock of materials.
Ying Xu, professor, doctor, doctoral supervisor, has been engaged in teaching and scientific research in civil engineering materials, geotechnical engineering blasting, mine construction engineering, and other directions for a long time. He has successively presided over 20 key projects of the National Natural Science Foundation, surface projects, and provincial and ministerial projects. More than 150 papers have been published, of which 40 have been included by SCI and EI, and 5 academic monographs and teaching materials have been published, such as “Theory and Application of blasting in Underground Engineering” and “Theo-ry and practice of explosive grouting in the weak zone”. It has won 1 firstprize, 2 second prize and 10 third prize at the provincial and ministerial level. It has won the honorary titles of outstanding talents of the Ministry of Education in the new century, blasting experts with outstanding contributions in the whole country, academic and technological leaders of Anhui Province, and Anhui Outstanding Youth Scientific and technological Innovation Award. The academic part-time jobs are the vice president of China blasting Industry Association, the vice-chairman of Engineering blasting Committee of China Mechanical Society, the member of the blasting equipment and Technology expert Committee of China Coal expert Committee, and the vice-chairman of China Engineering blasting expert Committee.

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Cite this article:

YANG Rongzhou,XU Ying,CHEN Peiyuan. Effect of Curing Humidity on Dynamic Compressive Failure Characteristics and Energy Dissipation of Rubber Cement Mortar[J]. Materials Reports, 2020, 34(14): 14070-14078.

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http://www.mater-rep.com/EN/10.11896/cldb.19060039 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14070

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