碳化作用对再生混凝土界面显微结构的影响

发布时间：2018-04-19 15:00

本文选题：再生混凝土 + 界面过渡区　；参考：《沈阳建筑大学学报(自然科学版)》2017年04期

【摘要】：目的研究碳化作用对再生混凝土界面过渡区显微硬度及宽度的影响,从微观层面揭示碳化反应对再生混凝土的作用机理.方法通过显微硬度仪来测量碳化前后再生混凝土多重界面的显微硬度.结果强度等级相同的再生混凝土,经28 d碳化后,老骨料-新浆体界面处显微硬度值增大,界面过渡区宽度不同程度减小;老浆体-新浆体界面的显微硬度有所增大,过渡区宽度略有减小;老骨料-老浆体界面显微硬度的影响规律与老骨料-新浆体界面显微硬度的影响规律基本一致.结论碳化反应能够提高再生混凝土中水泥浆体和界面过渡区的密实程度和显微硬度;强度等级相同的再生混凝土,界面孔隙率的大小以及碳化作用对老骨料-新浆体界面的影响最大,其次是老骨料-老浆体界面,对老浆体-新浆体界面的影响最小.
[Abstract]:Aim to study the effect of carbonation on the microhardness and width of the interface transition zone of recycled concrete, and to reveal the mechanism of carbonation reaction on recycled concrete.Methods the microhardness of multiple interfaces of recycled concrete before and after carbonization was measured by microhardness tester.Results after 28 d carbonization of recycled concrete with the same strength grade, the microhardness value at the interface between old aggregate and new slurry increased, the width of interface transition zone decreased, and the microhardness of interface between old aggregate and new slurry increased.The width of transition zone decreases slightly, and the effect of microhardness on the interface between old aggregate and old slurry is basically consistent with that of old aggregate and new slurry.Conclusion Carbonization reaction can improve the compactness and microhardness of cement paste and interfacial transition zone in recycled concrete, and the recycled concrete with the same strength grade.The effect of porosity and carbonation on the interface between old aggregate and new slurry is the largest, followed by the interface between old aggregate and old slurry, and the effect on the interface between old aggregate and new slurry is the least.
【作者单位】：青岛理工大学土木工程学院;
【基金】：国家自然科学基金项目(51378270,51578297)
【分类号】：TU528

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