1.广西科技大学 土木建筑工程学院, 广西 柳州 545006
2.广西高校防灾减灾与预应力技术重点实验室,广西 柳州 545006
3.广西大学工程防灾与结构安全教育部重点实验室,广西 南宁 530004
胡强(1978—),男,高工,硕导。主要从事组合结构与结构抗震加固方面的研究。E-mail:330437811@qq.com
陈宇良(1987—),男,副教授,硕导。主要从事钢‑混凝土组合结构、海洋及近海混凝土结构等方面的研究。E‑mail:ylchen@gxust.edu.cn
收稿:2023-03-05,
修回:2023-05-15,
纸质出版:2024-06-25
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胡强,李佳成,陈宇良等.高温后珊瑚海水海砂混凝土力学性能试验研究[J].防灾减灾工程学报,2024,44(03):544-550.
HU Qiang,LI Jiacheng,CHEN Yuliang,et al.Experimental Study on Mechanical Properties of Coral Seawater Sea Sand Concrete after High Temperature[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):544-550.
胡强,李佳成,陈宇良等.高温后珊瑚海水海砂混凝土力学性能试验研究[J].防灾减灾工程学报,2024,44(03):544-550. DOI: 10.13409/j.cnki.jdpme.20230305001.
HU Qiang,LI Jiacheng,CHEN Yuliang,et al.Experimental Study on Mechanical Properties of Coral Seawater Sea Sand Concrete after High Temperature[J].Journal of Disaster Prevention and Mitigation Engineering,2024,44(03):544-550. DOI: 10.13409/j.cnki.jdpme.20230305001.
为研究高温后珊瑚海水海砂混凝土(CSSC)的力学性能,设计制作了30个CSSC试件,进行常温与高温后轴心受压和静力受压弹性模量试验。通过试验观察了试件高温后的表观变化
和轴心受压破坏形态,获取了轴心受压全过程应力—应变曲线、弹性模量及烧失率等参数,深入高温后CSSC微观结构变化机制,得到了受火温度对CSSC力学性能的影响规律,揭示了高温作用后CSSC的力学性能退化机理。结果表明:随着受火温度的增加,CSSC力学性能不断劣化。
T
=200 ℃时CSSC轴心抗压强度和弹性模量分别比常温时下降了26.52 %,6.19 %,混凝土具有较好的力学性能;
T
=400 ℃时CSSC弹性模量下降迅速,弹性模量损失率为65.48 %,但与
T
=200 ℃相比混凝土轴心抗压强度上升了6.4 %;
T
=600 ℃时CSSC轴心抗压强度下降迅速,强度损失率为66.74 %;
T
=800 ℃时CSSC破坏严重,已无法测得有效的弹性模量。
To study the mechanical properties of Coral Seawater Sea Sand Concrete (CSSC) after exposure to high temperatures
axial compression and static compression elastic modulus tests were conducted on 30 CSSC specimens at room and high temperatures. The axial compression failure patterns and apparent changes of the specimens after exposure to high temperatures were observed
and parameters such as the complete stress-strain behavior under axial compression
elastic modulus
and weight loss rate were obtained. In conjunction with an in-depth analysis of the mechanisms of microstructural changes in CSSC after exposure to high temperatures
the study explored the influence of fire temperature on CSSC's mechanical properties and revealed the degradation mechanism of these properties after high-temperature exposure. The results demonstrated a progressive decline in the mechanical properties of CSSC as the fire temperature increased. At 200 ℃
compared to specimens at room temperature
the axial compressive strength and elastic modulus of CSSC decreased by 26.52% and 6.19%
respectively
indicating good mechanical properties. At 400 ℃
the elastic modulus of CSSC decreased rapidly
with a loss of 65.48%
but its axial compressive strength increased by 6.4% compared to specimens at 200 ℃. At 600 ℃
the axial compressive strength of CSSC exhibited a rapid decline
with a strength loss rate of 66.74%. The CSSC was severely damaged at 800 ℃
making it impossible to measure its effective elastic modulus.
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