Mechanical behaviour of seawater sea-sand recycled coarse aggregate concrete columns under axial compressive loading
Mechanical behaviour of seawater sea-sand recycled coarse aggregate concrete columns under axial compressive loading
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DOI：
10.1016/j.conbuildmat.2019.117050
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发表时间：
2019-12
影响因子：
7.4
通讯作者：
Qingtian Zhang;Jianzhuang Xiao;Peng Zhang;Kaijian Zhang
中科院分区：
文献类型：
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作者：
Qingtian Zhang;Jianzhuang Xiao;Peng Zhang;Kaijian Zhang
利用当地可获得的海水和海砂生产海水海砂混凝土（SSC）在海洋和海岸工程中具有广阔的应用前景。本文研究了再生粗骨料（SSRAC）制备的SSC柱的力学性能。结果表明，当海砂中贝壳含量为2.31%时，海水海砂基混凝土柱的性能与传统的天然骨料混凝土（NAC）相似。SSRAC柱在强度和变形性方面优于RAC柱，峰值载荷能力高出约17%。基于整体试件，SSRAC组合混凝土柱是通过使用钢增强NAC或工程水泥基复合材料（ECC）壳约束SSRAC核心来实现的。与整体柱相比，NAC-SSRAC复合柱的峰值负荷能力相似，而ECC-SSRAC柱的峰值负荷能力高15%。采用无箍筋ECC网壳对SSRAC进行约束是可行的。此外，现有的箍筋约束混凝土应力-应变模型的SSRAC及其组合混凝土柱的适用性进行了评估。
The use of locally available seawater and sea-sand to produce seawater sea-sand concrete (SSC) is promising in marine and coastal projects. This paper investigates the mechanical behaviour of SSC columns that are prepared with recycled coarse aggregates (SSRAC). The results demonstrate that the seawater-sea-sand-based concrete column behaves similarly to conventional natural aggregate concrete (NAC) when the shell content in sea-sand equals 2.31%. SSRAC columns outperform RAC columns in terms of strength and deformability with a peak load capacity that is approximately 17% higher. Based on the monolithic specimens, the SSRAC composite concrete column is realized by confining the SSRAC core using steel-reinforced NAC or an engineered cementitious composite (ECC) shell. Compared with monolithic specimens, the peak load capacity of the NAC-SSRAC composite column is similar, whereas that of the ECC-SSRAC column is 15% higher. It is feasible to use the ECC shell without stirrups to confine SSRAC. Furthermore, the applicability of available stirrup-confined concrete stress-strain models on the SSRAC and its composite concrete columns is evaluated.