Creep of Prestressed Self-Consolidating Concrete
Creep of Prestressed Self-Consolidating Concrete
复制标题
预应力自密实混凝土的徐变
DOI：
10.14359/51683256
复制
发表时间：
2011-09
影响因子：
1.7
通讯作者：
Khayat Kamal Henri
中科院分区：
文献类型：
--
作者：
Long Wu-Jian;Khayat Kamal Henri
本文将讨论在结构构件设计中，由徐变引起的与时间相关的变形如何导致预应力损失以及拱度变化。进行了一个试验项目以评估预应力自密实（混凝土，此处“self-conso”可能是“self-consolidating concrete”的缩写）的徐变。
This paper will discuss how time-dependent deformations caused by creep lead to the loss of prestressing force and changes in camber in the design of structural members. An experimental program was performed to evaluate the creep of prestressed self-consolidating concrete (SCC). A total of 16 SCC mixtures with a slump flow of 680 ± 20 mm (26.7 ± 0.8 in.) were prepared with various parameters, including the binder content and binder type, water-cementitious material ratio (w/cm), dosage of viscosity modifying admixture, and sand-to-total aggregate ratio (S/A). Two high-performance concrete (HPC) mixtures with 0.34 and 0.38 w/cm and a slump consistency of 150 mm (5.9 in.) were investigated for the control mixtures. The findings indicated that the evaluated SCC developed up to 20% higher creep than HPC of similar w/cm. The creep values of SCC were compared to the prediction models proposed by AASHTO 2004 and 2007, CEBFIP MC90, GL 2000, and ACI 209R-92. The CEB-FIP MC90 and modified AASHTO 2007 models are found to provide an adequate prediction of creep for prestressed SCC.