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Effect of Internal Curing with Superabsorbent Polymers on Bond Behavior of High-Strength Concrete
Advances in Materials Science and Engineering ( IF 2.098 ) Pub Date : 2020-12-31 , DOI: 10.1155/2020/6651452
Xiao Lei 1 , Rui Wang 1 , Hanwan Jiang 2 , Faxiang Xie 1 , Yanni Bao 3
Affiliation  

High-strength concrete (HSC) is widely used in engineering due to its high strength and durability. However, because of its low water-to-cement ratio, external curing water hardly enters the dense internal structure of HSC so that high self-desiccation shrinkage often takes place. As a result, superabsorbent polymers (SAP) are added as an internal curing material to effectively reduce the shrinkage of high-performance concrete. Meanwhile, the bond performance between reinforcing steel and SAP HSC concrete remains unknown. In this paper, the bond performance of HSC mixed with SAP is studied by pull-out tests, and the results were obtained as follows: (1) the bond strength of HSC mixed with SAP increased first and then decreased with the increase of SAP content; (2) the slip at ultimate bond strength of HSC with SAP decreased with the increase of compressive strength; (3) a prediction model of the stress-slip relationship between steel rebars and HSC was established.

中文翻译:

高吸收性聚合物内部固化对高强度混凝土粘结性能的影响

高强度混凝土(HSC)由于其高强度和耐用性而在工程中广泛使用。然而,由于其低的水灰比,外部固化水几乎不进入HSC的致密内部结构,因此经常发生高的自干燥收缩。结果,添加了超吸收性聚合物(SAP)作为内部固化材料,以有效减少高性能混凝土的收缩。同时,钢筋与SAP HSC混凝土之间的粘结性能仍然未知。本文通过拉拔试验研究了HSC与SAP的结合性能,得出以下结论:(1)HSC与SAP的结合强度随SAP含量的增加先升高后降低。 ; (2)随着抗压强度的增加,HSC与SAP的极限粘结强度的滑移减小。(3)建立了钢筋与HSC之间应力-滑动关系的预测模型。
更新日期:2020-12-31
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