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Long-term behavior of continuous composite slabs made with 100% fine and coarse recycled aggregate
Engineering Structures ( IF 5.5 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.engstruct.2020.110464
Huan Zhang , Yue Geng , Yu-Yin Wang , Qinghe Wang

Abstract A composite slab is an efficient modern structural member. Recycled fine and coarse aggregates are alternative green materials for the depleting natural sand and natural gravels in the composite slabs. In recent years, the nonuniform shrinkage occurring in single-side-exposed concrete has been discovered to significantly affect the long-term behaviors of composite slabs, which have been included in newly published codes. Applying recycled aggregate concrete (RAC) would further increase the effect of nonuniform shrinkage on the long-term behaviors of composite slabs. However, most studies, with RAC or not, have only focused on simply- supported composite slabs. For continuous composite slabs (CCSs), in addition to increasing deflections, a nonuniform shrinkage would induce a larger negative bending moment, which would further increase the crack width at the interior support region. Hitherto, no experiment has been conducted regarding the time-dependent crack width of CCSs and CCSs with RAC. Therefore, the aim of this study is to investigate the effects of nonuniform shrinkage and RAC on the deflections, strains, and cracks of CCSs. Hence, a 500-d experiment was conducted on three full-scale specimens. Finally, a finite element (FE) model was established and benchmarked against the test results of this study and those reported in the literature. The results indicated that (1) nonuniform shrinkage significantly increased the crack width at the negative bending moment region; (2) the use of RAC resulted in a more significant effect of the nonuniform, e.g. mid-span deflections, soffit strains, and crack widths increased by 40%, 64%, and 38%, respectively; and (3) the FE model can predict the long-term behaviors of CCSs well.

中文翻译:

由 100% 细骨料和粗骨料制成的连续复合板的长期性能

摘要 组合板是一种高效的现代结构构件。再生细骨料和粗骨料是替代的绿色材料,用于消耗复合板中的天然砂和天然砾石。近年来,已发现单面外露混凝土中发生的不均匀收缩会显着影响复合板的长期性能,这些已包含在新发布的规范中。应用再生骨料混凝土 (RAC) 将进一步增加不均匀收缩对复合板长期行为的影响。然而,大多数研究,无论是否使用 RAC,都只关注简支复合板。对于连续复合板(CCS),除了增加挠度外,不均匀的收缩会导致更大的负弯矩,这将进一步增加内部支撑区域的裂纹宽度。迄今为止,还没有关于 CCS 和带有 RAC 的 CCS 的随时间变化的裂纹宽度的实验。因此,本研究的目的是研究非均匀收缩和 RAC 对 CCS 挠度、应变和裂纹的影响。因此,对三个全尺寸标本进行了 500 天的实验。最后,建立了一个有限元 (FE) 模型,并以本研究的测试结果和文献中报告的结果为基准。结果表明:(1)不均匀收缩显着增加了负弯矩区的裂纹宽度;(2) RAC 的使用导致了更显着的不均匀效应,例如跨中挠度、拱腹应变和裂纹宽度增加了 40%、64% 和 38%,分别; (3) 有限元模型可以很好地预测 CCS 的长期行为。
更新日期:2020-06-01
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