Flexural behavior of concrete slabs strengthened with textile reinforced geopolymer mortar
Flexural behavior of concrete slabs strengthened with textile reinforced geopolymer mortar
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DOI：
10.1016/j.compstruct.2022.115220
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发表时间：
2022-01
影响因子：
6.3
通讯作者：
Hai Yan Zhang;Hao Yu Liu;V. Kodur;Meng Yuan Li;Yun Zhou
中科院分区：
文献类型：
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作者：
Hai Yan Zhang;Hao Yu Liu;V. Kodur;Meng Yuan Li;Yun Zhou
本文介绍了织物增强地质聚合物砂浆（TRGM）加固钢筋混凝土（RC）单向板的抗弯性能的试验和数值研究结果。对8块钢筋混凝土单向板进行了静力试验，其中5块为TRGM加固板，2块为TRPM（织物增强聚合物改性水泥砂浆）加固板，1块为未加固板。实验中的各种参数包括织物层的数量、横向织物的间距、锚固的存在和粘合剂的类型。试验数据被用来验证有限元模型来模拟TRGM加固板的弯曲响应。然后进行了一组参数研究，以评估配筋率，板厚度和加强层的数量的影响。从测试和数值研究的结果清楚地表明，使用TRGM的加强延迟的发展和进展的裂缝板，并提高了开裂后的刚度，以及抗弯承载力。此外，抗弯承载力的增加与加强层的数量，并减少横向纺织品的间距。与TRPM加固板相比，TRGM加固板具有更高的抗弯承载力和更好的裂缝控制效果。最后，提出了TRGM加固板抗弯承载力的计算模型，模型计算结果与试验和数值模拟结果吻合较好。
This paper presents results from experimental and numerical studies on the flexural behavior of reinforced concrete (RC) one-way slabs strengthened with textile reinforced geopolymer mortar (TRGM). Eight one-way RC slabs, comprising of five TRGM strengthened slabs, two TRPM (textile reinforced polymer-modified cement mortar) strengthened slabs and one un-strengthened slab, were tested under static loading. The varied parameters in the experiments included the number of textile layers, spacing of the lateral textiles, presence of anchorage, and type of binder. Data from the tests is utilized to validate finite element models developed to simulate the flexural response of TRGM strengthened slabs. Then a set of parametric studies were conducted, to evaluate the effect of reinforcement ratio, slab thickness and the number of strengthening layers. Results from the tests and numerical studies clearly show that use of TRGM for strengthening delays the development and progression of cracks in slabs and enhances the post-cracking stiffness, as well as flexural capacity. In addition, the flexural capacity increases with increased number of strengthening layers, and decreased spacing of lateral textiles. Compared with TRPM strengthened slabs, TRGM strengthened slabs possess higher flexural capacity and better crack control. Finally, a calculation model for predicting the flexural capacity of TRGM strengthened slabs is proposed and the model predictions of flexural capacity is in good agreement with the results from tests and numerical simulations.