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The influence of casting position and disturbance induced by reinforcement on the structural concrete strength
Structural Concrete ( IF 3.2 ) Pub Date : 2020-05-09 , DOI: 10.1002/suco.201900562
Francesco Moccia 1 , Xavier Kubski 2 , Miguel Fernández Ruiz 1 , Aurelio Muttoni 1
Affiliation  

It is well known that control specimens used to assess the concrete strength of new structures have different casting and curing conditions than those of actual structures. Notably, after pouring of the concrete and before its hardening, a number of phenomena such as concrete bleeding and plastic settlement occur, influencing the in‐situ strength with respect to that of small and homogeneous control specimens (cubes or cylinders). In addition, the development of these phenomena and their structural implications are influenced by the presence of reinforcing bars, disturbing the settlement and bleeding of fresh concrete. In this paper, these aspects, with particular emphasis on the effective structural strength, are investigated by means of a testing program performed with refined measurement techniques such as tomography and Digital Image Correlation. On that basis, consistent design rules are derived to correct the strength of control specimens in order to calculate the resistance of a structural concrete member.

中文翻译:

浇注位置和钢筋引起的扰动对结构混凝土强度的影响

众所周知,用于评估新结构混凝土强度的控制标本与实际结构具有不同的浇铸和养护条件。值得注意的是,在混凝土浇筑后和硬化之前,会发生许多现象,例如混凝土渗水和塑性沉降,相对于较小且均质的控制试样(立方体或圆柱体),会影响原位强度。此外,这些现象的发展及其结构意义还受到钢筋的存在的影响,从而干扰了新鲜混凝土的沉降和渗出。在本文中,这些方面,特别是有效结构强度方面,通过使用诸如断层扫描和数字图像相关性之类的改进的测量技术执行的测试程序来对图像进行调查。在此基础上,得出了一致的设计规则,以校正控制试样的强度,以便计算结构混凝土构件的抗力。
更新日期:2020-05-09
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