Effect of aggregate characteristics on properties of cemented sand and gravel

IF 1.9 4区材料科学 Q3 Materials Science

Science and Engineering of Composite Materials Pub Date : 2023-01-01 DOI:10.1515/secm-2022-0220

Lixia Guo, Zhengqi Wu, L. Zhong, Y. Luo

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引用次数: 0

Abstract

Abstract To improve the stability of cemented sand and gravel (CSG) dam construction materials, artificial aggregates can be selected to replace missing natural aggregates, and aggregate grading optimization can be carried out to meet the needs of engineering applications. This article uses finite-element analysis software to explore the influence of aggregate characteristics on the performance and destruction characteristics of CSG materials through numerical simulation. The results show that (1) with the increase of circular natural sand gravel aggregates, the peak stress and elastic modulus of the sample increase, while the strength also increases. (2) Compared to circular aggregates, polygonal aggregates have more edges and corners, which exacerbate the deformation disharmony between mortar and aggregates; the phenomenon of stress concentration is more obvious, so under the same loading step, the degree of damage of polygonal aggregates is greater than that of circular aggregates. (3) After the freeze–thaw cycle test, the deterioration of parameters in the CSG resulted in more severe damage and strength loss of the crushed stone aggregate than the circular aggregate sample. This conclusion can provide a reference for the design of CSG mix ratio in engineering sites.

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集料特性对胶结砂砾石性能的影响

摘要为了提高胶结砂砾(CSG)筑坝材料的稳定性，可以选择人工骨料替代缺失的天然骨料，并对骨料级配进行优化，以满足工程应用的需要。本文利用有限元分析软件，通过数值模拟，探讨集料特性对CSG材料性能和破坏特性的影响。结果表明:(1)随着圆形天然砂砾骨料的增加，试样的峰值应力和弹性模量增大，强度也随之增大。(2)与圆形骨料相比，多边形骨料棱角较多，加剧了砂浆与骨料之间的变形不协调;应力集中现象更为明显，因此在相同加载步骤下，多边形集料的破坏程度大于圆形集料。(3)冻融循环试验后，CSG内参数劣化导致碎石骨料的破坏和强度损失比圆形骨料试样更为严重。该结论可为工程现场煤矸石配合比设计提供参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science and Engineering of Composite Materials 工程技术-材料科学：复合

CiteScore

3.10

自引率

5.30%

发文量

审稿时长

4 months

期刊介绍： Science and Engineering of Composite Materials is a quarterly publication which provides a forum for discussion of all aspects related to the structure and performance under simulated and actual service conditions of composites. The publication covers a variety of subjects, such as macro and micro and nano structure of materials, their mechanics and nanomechanics, the interphase, physical and chemical aging, fatigue, environmental interactions, and process modeling. The interdisciplinary character of the subject as well as the possible development and use of composites for novel and specific applications receives special attention.