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首页> 外文期刊>ACI Structural Journal >Service-Load Behavior of Precast/Prestressed Concrete Beams with Recycled Concrete Aggregates
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Service-Load Behavior of Precast/Prestressed Concrete Beams with Recycled Concrete Aggregates

机译：再生混凝土骨料预制/预应力混凝土梁的服役性能

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摘要

This paper describes an experimental investigation on the use of recycled concrete aggregates (RCAs) as replacement for coarse natural aggregates (NAs) in precast/prestressed concrete structures. Specifically, sustained service load tests were conducted on 18 pretensioned beams with two different levels of RCA (50% and 100% by aggregate volume), two sources of high-quality RCA (from both rejected precast members and a construction demolition recycling yard), two different concrete mixture designs, concrete ages of 7 days and 28 days at superimposed service loading, and two different levels of prestressing (to result in beams that are uncracked or cracked under the superimposed load). The loss of prestress over time and midspan deflections of the beam specimens were monitored. Creep and shrinkage strains of accompanying concrete cylinders were also measured. The results showed that the effect of RCA on the service-load behavior of the beams was modest, even at full (100%) aggregate replacement. Additionally, the ability of current code approaches to estimate the measured immediate and sustained load deflections of the beams was not affected by the use of RCA.
机译：本文描述了使用再生混凝土骨料（RCA）替代预制/预应力混凝土结构中的天然粗骨料（NA）的实验研究。具体而言，我们在18种预应力梁上进行了持续服务载荷测试，这些梁具有两种不同水平的RCA（总体积的50％和100％），两种高质量的RCA（来自被拒绝的预制构件和建筑拆除回收场），两种不同的混凝土混合料设计，即在加重荷载作用下的混凝土龄期分别为7天和28天，以及两种不同水平的预应力（以使梁在加重荷载下不破裂或开裂）。监测梁样本随时间的预应力损失和中跨挠度。还测量了伴随的混凝土圆柱体的蠕变和收缩应变。结果表明，即使完全（100％）骨料置换，RCA对梁的服役性能的影响也很小。此外，使用RCA不会影响当前代码方法估计梁的即时和持续载荷挠度的能力。

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