硫酸盐环境下预应力混凝土梁性能劣化研究

发布时间：2018-10-14 20:44

【摘要】：为研究预应力混凝土梁受硫酸盐腐蚀后的性能劣化,制作了10根预应力混凝土试验梁分别浸泡在质量分数w=3%,5%,10%的Na2SO4溶液中,并进行腐蚀后静力受弯试验.研究表明,混凝土抗压强度和动弹性模量随腐蚀时间均表现出前期提高而后期下降的趋势,当腐蚀期为3a时,混凝土抗压强度和动弹性模量的降低分别达23.8%和15.1%;与未腐蚀试件对比,试验梁经短期或长期浸泡腐蚀后,其开裂荷载均有所提高;经溶液腐蚀60d和2a的试件承载力与未腐蚀试件相比没有明显的变化,而腐蚀3a后的试件承载力降低达12.1%;受硫酸盐腐蚀后试验梁刚度及延性均有所下降,延性的降低与溶液的质量分数和浸泡腐蚀时间呈线性关系.
[Abstract]:In order to study the deterioration of the performance of prestressed concrete beams after being corroded by sulphate, 10 prestressed concrete test beams were made and immersed in 10% Na2SO4 solution with a mass fraction of w ~ (3 ~ (3) and 10% respectively, and the static bending tests were carried out after corrosion. The results show that the compressive strength and dynamic elastic modulus of concrete increase in the early stage and decrease in the later stage with the corrosion time, when the corrosion period is 3 years, The compressive strength and dynamic elastic modulus of concrete decreased by 23.8% and 15.1respectively, and the cracking load of test beams increased after short-term or long-term immersion corrosion compared with non-corroded specimens. The bearing capacity of the specimens corroded by solution for 60 days and 2 years had no obvious change compared with the non-corroded specimens, but the bearing capacity of the specimens after 3 years of corrosion decreased to 12.1.The stiffness and ductility of the test beams decreased after sulphate corrosion. The decrease of ductility is linearly related to the solution mass fraction and immersion corrosion time.
【作者单位】：扬州大学建筑科学与工程学院;
【基金】：国家自然科学基金资助项目(50978224,51278445,51308490) 江苏省自然科学基金资助项目(BK20130450) 住房和城乡建设部科学技术计划项目资助(2013-K4-17) 江苏省高校自然科学基金资助项目(13KJB560015) 扬州市科技计划项目资助(2012149) 教育部博士点基金(博导类)资助项目(20123227110006)
【分类号】：TU378.2

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