Seruga Andrzej, Szydłowski Rafał Stanisław, Ślaga Łukasz
Department of Civil Engineering, Cracow University of Technology, Warszawska 24 Street, 31155 Cracow, Poland.
Materials (Basel). 2024 Sep 3;17(17):4361. doi: 10.3390/ma17174361.
This paper deals with the issue of the bond of concrete with the new artificial aggregate Certyd to prestressing steel strands. The solution of the problem is of great importance in the development of the use of lightweight aggregate concrete for prestressed concrete elements. Experimental research on the bond stress-slip relationship of concrete to 15.7 mm non-pretensioned steel strand was carried out. The results of bond stress-slip tests for various embedment lengths (40, 80, 120, 240, 330 and 460 mm) for test specimens made of the same lightweight aggregate concrete mixture, in which the transfer of prestressing force took place at different levels of concrete maturity (after 3, 7 and 28 days of concrete maturing), are presented. Based on the obtained results, an analytical model of the bond stress-slip relationship of lightweight aggregate Certyd concrete to 15.7 mm non-pretensioned steel strand was proposed. The tests presented demonstrated that the lightweight aggregate (Certyd) concrete is suitable for the production of pretensioned concrete elements.
本文探讨了新型人造集料Certyd混凝土与预应力钢绞线之间的粘结问题。该问题的解决对于轻质集料混凝土在预应力混凝土构件中的应用发展具有重要意义。开展了混凝土与15.7毫米非预应力钢绞线粘结应力-滑移关系的试验研究。给出了由相同轻质集料混凝土混合料制成的试件在不同埋置长度（40、80、120、240、330和460毫米）下的粘结应力-滑移试验结果，其中预应力传递发生在不同混凝土龄期（混凝土养护3、7和28天后）。基于所得结果，提出了轻质集料Certyd混凝土与15.7毫米非预应力钢绞线粘结应力-滑移关系的解析模型。所展示的试验表明，轻质集料（Certyd）混凝土适用于生产先张法预应力混凝土构件。
