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对不同龄期(28,112,183,345,810,1 248,1 550d)的混凝土进行了不同应变速率(10~(-5),5×10~(-5),10~(-4),5×10~(-4),10~(-3),5×10~(-3),10~(-2)/s)下的单轴压缩试验,试件尺寸为Φ150 mm×300 mm,研究了龄期和加载速率对混凝土的力学性能影响。结果表明:1在同一龄期下,混凝土的峰值应力随着应变速率增长而增大;在同一应变速率下,混凝土的峰值应力随着龄期的增长而增大,800d后峰值应力趋于稳定;2在同一应变速率下,混凝土的吸能能力随着龄期的增长而增加,表现出了峰值应力与龄期之间相似的规律。
The concrete with different strain rates (10 -5, 5 × 10 -5, 10 -4, 5 × 10 ~ (- 1)) at different ages (28,112,183,345,810,1 248,1 550 d) Uniaxial compression tests were carried out under the conditions of 10 ~ (-3), 5 × 10 ~ (-3) and 10 ~ (-2) / s, and the specimen size was Φ150 mm × 300 mm. Effect of Loading Rate on Mechanical Properties of Concrete. The results show that: 1 at the same age, the peak stress of concrete increases with the increase of strain rate; at the same strain rate, the peak stress of concrete increases with age, and the peak stress tends to be stable after 800 days ; 2 At the same strain rate, the energy absorption capacity of concrete increases with age, showing a similar law between peak stress and age.