Mechanical properties of prestressed self-consolidating concrete
Mechanical properties of prestressed self-consolidating concrete
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DOI：
10.1617/s11527-012-9989-9
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发表时间：
2013-09
影响因子：
3.8
通讯作者：
Wujian Long;K. Khayat;S. Hwang
中科院分区：
文献类型：
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作者：
Wujian Long;K. Khayat;S. Hwang
由于自固结混凝土的配合比设计不同于传统混凝土，其力学性能可能与振动混凝土有所不同。进行了一项试验程序，以评估用于预制，预应力应用的SCC的力学性能。采用粘结剂含量、粘结剂种类、w/cm、增粘剂掺量、砂与总骨料体积比等参数，制备了16种坍落度为680±20 mm的SCC混合料。两种高性能混凝土混合物，代表典型的混凝土用于预制，预应力应用的控制混合物进行了研究。它们的比例分别为0.34和0.38 w/cm，坍落度为150 mm。将SCC的力学性能与规范规定进行比较，以估计抗压强度、弹性模量和抗弯强度。改进的ACI 209-90和CEB-FIP MC90规范提供了较好的抗压强度估计。AASHTO 2007模型能较好地预测SCC的弹性模量和抗弯强度。
Since the mix design of self-consolidating concrete (SCC) differs from that of conventional concrete, mechanical properties of SCC may differ from those of vibrated concrete. An experimental program was performed to evaluate mechanical properties of SCC used for precast, prestressed applications. Sixteen SCC mixtures with a fixed slump flow of 680 ± 20 mm were prepared with different mixture parameters, including binder content and binder type, w/cm, dosage of viscosity-modifying admixture, and sand-to-total aggregate volume ratio. Two high-performance concrete mixtures that represent typically concrete used for precast, prestressed applications were investigated for the control mixtures. They were proportioned with 0.34 and 0.38 w/cm and had slump values of 150 mm. Mechanical properties of SCC were compared to code provisions to estimate compressive strength, elastic modulus, and flexural strength. The modified ACI 209-90 and CEB-FIP MC90 codes are found to provide good estimate for compressive strength prediction. The AASHTO 2007 model can provide good prediction of the elastic modulus and flexural strength of SCC.