摘要
文章设计无应力,0.2fc、0.4fc、0.6fc、0、0.2ft、0.4ft、0.6ft七种应力状态,试验探讨了水工混凝土抗冻性及抗碳化性能受不同应力条件的影响,并进一步揭示冻融、碳化与应力的耦合作用机理,结合试验数据提出应力修正系数ψ,从而优化抗冻性能预测方法。研究表明:不同应力条件均会显著影响水工混凝土抗冻和抗碳化性,其中压应力有利于抑制碳化作用,而拉应力会加速碳化,随着碳化时间的延长其碳化速度不断减小,碳化深度逐渐增大;水工混凝土在拉应力条件下的抗冻性能较差,为改善抗冻性可以施加适当的压应力,其中0.4fc压应力条件下的抗冻性最优。
Seven stress states of non-stress,0.2fc,0.4fc,0.6fc,0,0.2ft,0.4ft and 0.6ft are designed in this paper.The effects of different stress conditions on freeze resistance and carbonation resistance of hydraulic concrete are discussed,and the coupling mechanism of freeze thaw,carbonation and stress is further revealed.The stress correction coefficient ψ is proposed based on test data.The method of frost resistance prediction is optimized.The results show that different stress conditions can significantly affect the frost resistance and carbonization resistance of hydraulic concrete,compressive stress can inhibit carbonization,while tensile stress can accelerate carbonization,with the extension of carbonization time,the carbonization speed decreases and the carbonization depth increases.The freeze-resistance of hydraulic concrete under tensile stress is poor,in order to improve the freeze-resistance,appropriate compressive stress can be applied,and the freeze-resistance under 0.4fc is the best.
作者
李彦锋
Li Yanfeng(Panjin Urban Water Conservancy Service Center,Panjin 124000,China)
出处
《黑龙江水利科技》
2023年第10期1-4,共4页
Heilongjiang Hydraulic Science and Technology
关键词
应力条件
抗冻性
抗碳化性
水工混凝土
stress condition
freezing resistance
resistance to carbonizing
hydraulic concrete
