水工混凝土老化测试与耐久性评估的试验研究

发布时间：2018-03-05 13:01

本文选题：水工混凝土　切入点：耐久性评估　出处：《公路工程》2016年06期 　论文类型：期刊论文

【摘要】：以贵州某水库服役约40 a的泄洪闸底板的混凝土钻芯样为研究对象,对其老化测试和耐久性评估试验进行了研究。老化测试表明,碳化深度小于40 mm,混凝土碳化层、未碳化层、交接面的横劈强度值相差较小,横劈强度值浮动范围分别为1.91~2.82、2.70~4.94、2.48~3.75 MPa范围内浮动,在碳化深度较小时,不易碳化的混凝土碳化后,其未碳化混凝土、碳化混凝土强度变化不大。耐久性评估试验表明,对于C35现浇混凝土试件,在4、8、10 d,其强度下降分别比芯样快3.2%、4.6%、7.9%,最后C35现浇试件强度趋于平稳。经15%的H_2SO_4溶液浸泡后,混凝土芯样、C35现浇混凝土横劈强度,随着浸泡天数的增加均呈减小趋势,纯净水浸泡的芯样则呈增大趋势。C35现浇混凝土蚀强率随着时间变化不呈线性关系,芯样混凝土呈线性关系。
[Abstract]:In this paper, the concrete core samples of the bottom slab of a reservoir in Guizhou province are studied. The aging test and durability evaluation test show that the carbonation depth is less than 40 mm, the concrete carbonation layer is less than 40 mm, the concrete carbonation layer is not carbonized, and the concrete carbonation depth is less than 40 mm. The transverse splitting strength of the interface is slightly different. The floating range of transverse splitting strength is 1.91 / 2.82 / 2.70 / 4.94 / 2.48 / 3.75 MPa, respectively. The uncarbonated concrete is not carbonized when the carbonization depth is small and it is not easy to carbonize. The strength of carbonized concrete does not change much. The durability evaluation test shows that for C35 cast-in-situ concrete specimens, the strength decreases 3.2and 4.6g / 10 days faster than the core sample, respectively. Finally, the strength of C35 cast-in-situ specimens tends to be stable. After immersion in H2SO4 solution of 15%, the strength of C35 cast-in-situ concrete specimens is stable. The transverse splitting strength of cast-in-place concrete of C35 concrete core sample showed a decreasing trend with the increase of soaking days, while the core sample soaked in pure water showed an increasing trend. The corrosion strength rate of C35 cast-in-place concrete did not show a linear relationship with time change. The core concrete is linear.
【作者单位】：河北水利电力学院;
【分类号】：TV431

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