Structural Performance of Self-Consolidating Concrete Used in Confined Concrete Columns
Structural Performance of Self-Consolidating Concrete Used in Confined Concrete Columns
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DOI：
10.14359/14560
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发表时间：
2005-07
影响因子：
1.8
通讯作者：
P. Paultre;K. Khayat;D. Cusson;S. Tremblay
中科院分区：
文献类型：
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作者：
P. Paultre;K. Khayat;D. Cusson;S. Tremblay
减少钢筋混凝土高度拥挤部分振动对密集劳动力需求的一种方法是使用自密实混凝土（SCC）。SCC可以迅速扩散到适当的位置并填充模板，而无需任何机械固结，并且材料成分分离的风险最小。本文报道了一项研究，比较了高约束混凝土柱的结构性能的情况下，普通混凝土（NC）和SCC。混凝土的抗压强度（40至80 MPa），约束的配置，和屈服强度（400和800 MPa）的影响也进行了评估。在本实验研究中，共测试了16个柱：11个在钢筋截面中使用NC或SCC铸造; 5个伴随的柱在没有钢筋的情况下铸造。三个未加固的柱进行单轴压缩试验，以确定整体混凝土抗压强度的大型列，而其他两个芯，以确定分布的就地抗压强度和弹性模量沿着列的高度。钢筋柱的试验结果表明，SCC产生更大的延性，虽然它开发的极限抗压强度略低于NC。该研究还证实，在良好约束的混凝土柱中，只要保持较小的柱间距，柱屈服强度的增加可以产生高度的约束。非钢筋混凝土柱的取芯表明，在SCC的情况下，在柱高上的就地性能分布比NC更均匀，这也被认为是普遍足够的。与普通强度的关系，无论混凝土类型的列与高屈服强度的关系提供了显着更好的限制比类似的列。作者的结论是，约束是更有效的普通强度混凝土比高强度混凝土。
One way to reduce the intensive labor demand for vibration of highly congested sections of reinforced concrete is to use self-consolidating concrete (SCC). SCC can spread rapidly into place and fill the formwork without any mechanical consolidation and with minimum risk of separation of the material constituents. This article reports on a study that compared the structural performance of highly confined concrete columns case with normal concrete (NC) and with SCC. The effects of concrete compressive strength (40 to 80 MPa), confining stirrup configuration, and stirrup yield strength (400 and 800 MPa) were also evaluated. A total of 16 columns were tested in this experimental investigation: 11 were cast either with NC or SCC in reinforced sections; five accompanying columns were cast without reinforcement. Three of the unreinforced columns were tested in uniaxial compression to determine the overall concrete compressive strength of the large-scale columns, while two others were cored to determine the distribution of the in-place compressive strength and modulus of elasticity along the column height. The test results on reinforced columns showed that SCC yielded greater ductility, although it developed slightly lower ultimate compressive strength than NC. The study also confirmed that an increase in the stirrup yield strength can generate a high degree of confinement in well-confined concrete columns provided that stirrup spacing is kept small. The coring of unreinforced concrete columns demonstrated that the distribution of in-place properties over the column height is more homogeneous in the case of SCC than NC, which was also found to be generally adequate. Columns made with high-yield-strength ties provided significantly better confinement than similar columns made with normal-strength ties, regardless of concrete type. The authors conclude that confinement was more effective in normal strength concrete than in high-strength concrete.