含再生骨料的海水海砂混凝土冲击性能实验研究

IF 8.6 2区 工程技术 Q1 ENERGY & FUELS
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引用次数: 0

摘要

在远离大陆的岛屿上,获取生产混凝土的原材料往往更具挑战性。为了实现岛礁工程的可持续发展,利用废弃的海运混凝土和岛屿建设过程中产生的珊瑚废料作为再生骨料具有相当重要的意义。因此,为岛礁工程制备再生珊瑚骨料混凝土(RCAC)具有重要意义。本研究制备了 RCAC 和天然骨料混凝土(NAC),两者的设计抗压强度均为 C60。首先,确定了再生粗骨料的基本物理特性,如表观密度、吸水率和压碎指数。随后,对含有不同比例再生珊瑚粗骨料(RCCA)的 RCAC 的准静态力学性能进行了比较分析。此外,还使用 Ф100mm Split Hopkinson Pressure Bar(SHPB)装置检测了不同 RCAC 试样在不同应变速率下的冲击压缩力学性能。此外,还使用扫描电子显微镜(SEM)和干燥收缩仪分析了 RCAC 的微观结构和长期干燥收缩性能。研究结果表明,粗骨料替代率为 100%的 RCAC 试样的 28 天抗压强度最高可达 62.4 兆帕。粗集料掺量为 50%和 100%的 RCAC 试样的准静态抗压强度分别比 NAC 试样低 11.5%和 14.2%。在冲击荷载下,RCAC 试样的动态抗压强度随应变速率的增加而增加,峰值应力与应变速率呈近似线性关系。RCAC 试样的能量耗散一般分为三个阶段,试样的反射能量和吸收能量随应变速率线性增加。在相同应变速率下,RCAC 试样的传递能量高于 NAC 试样。微观结构分析表明,再生珊瑚骨料的形态特征是表面多孔且粗糙。再生珊瑚骨料与水泥砂浆之间的界面过渡区相对致密。掺入再生粗骨料会显著影响混凝土的干燥收缩性能,RCCA 含量越高,干燥收缩率越大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Experimental study on impact performance of seawater sea-sand concrete with recycled aggregates

Experimental study on impact performance of seawater sea-sand concrete with recycled aggregates

On islands distant from the mainland, obtaining raw materials for concrete production is often more challenging. To achieve sustainable development in island reef engineering, using discarded marine concrete and coral waste generated during island construction as recycled aggregates are of considerable significance. The preparation of Recycled Coral Aggregate Concrete (RCAC) for island reef engineering thus holds substantial importance. In this study, RCAC and Natural Aggregate Concrete (NAC), both designed with a compressive strength of C60, were prepared. Initially, the fundamental physical properties of the recycled coarse aggregate, such as apparent density, water absorption, and crushing index, were determined. Subsequently, a comparative analysis of the quasi-static mechanical properties of RCAC with varying proportions of recycled coral coarse aggregate (RCCA) was conducted. Furthermore, the impact compression mechanical properties of different RCAC specimens under various strain rates were examined using the Ф100mm Split Hopkinson Pressure Bar (SHPB) apparatus. The microstructure and long-term drying shrinkage performance of RCAC were also analyzed using Scanning Electron Microscopy (SEM) and a drying shrinkage apparatus. The finding indicated that the 28-day compressive strength of RCAC specimens with 100% coarse aggregate replacement reached a maximum of 62.4 MPa. The quasi-static compressive strength of RCAC specimens with 50% and 100% RCCA replacement was only 11.5% and 14.2% lower than that of NAC, respectively. Under impact loading, the dynamic compressive strength of RCAC specimens increased with the strain rate, with peak stress exhibiting an approximately linear relationship with the strain rate. The energy dissipation of RCAC specimens generally occurred in three stages, with the reflected and absorbed energies of the specimens increasing linearly with strain rate. At the same strain rate, the transmitted energy of RCAC specimens was higher than that of NAC specimens. Microstructural analysis revealed that the morphology of recycled coral aggregate is characterized by its porous and rough surface. The interfacial transition zone between the recycled coral aggregate and the cement mortar was relatively dense. Incorporating recycled coarse aggregate significantly affected the drying shrinkage properties of the concrete, with higher contents of RCCA leading to greater drying shrinkage rates.

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来源期刊
Sustainable Materials and Technologies
Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment
CiteScore
13.40
自引率
4.20%
发文量
158
审稿时长
45 days
期刊介绍: Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.
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