摘要
本研究深入探讨了复杂环境下干湿循环对固废基混凝土力学性能及微观结构的影响,通过设置不同的干湿循环次数,系统地分析了硫酸盐侵蚀对固废基混凝土的破坏机理,重点考察了干湿循环过程中AFt的形成及其对混凝土力学性能以及微观结构的影响。实验结果显示,初期由于AFt的生成将相对动弹性模量从100%提高到了112%,抗压强度从43N/mm^(2)升高到了56N/mm^(2)。随着循环次数的增加,体积膨胀物质的过量导致内部裂缝的形成和扩展,从而加速了混凝土的劣化过程,显著降低了其力学性能,降低到了34N/mm^(2)。研究结果拓展了对固废基混凝土在复杂环境中性能变化的认识,为提高固废基混凝土的环境适应性和延长其服务寿命提供了理论和实验依据。
This study deeply explored the effects of dry-wet cycles on the mechanical properties and microstructure of solid waste-based concrete under complex environments.By setting different numbers of dry-wet cycles,the damage mechanism of sulfate erosion on solid waste-based concrete was systematically analyzed,focusing on the formation of AFt during the dry-wet cycle and its effects on the mechanical properties and microstructure of concrete.The experimental results show that the initial generation of AFt increases the relative dynamic elastic modulus from 100%to 112%,and the compressive strength from 43 N/mm^(2)to 56 N/mm^(2),which is beneficial to improving the mechanical function and relative dynamic elastic modulus of concrete.As the number of cycles increases,the excess volume expansion substances lead to the formation and expansion of internal cracks,which accelerates the deterioration process of concrete and significantly reduces its mechanical properties to 34 N/mm^(2).The research results expand the understanding of the performance changes of solid waste-based concrete in complex environments,and provide theoretical and experimental basis for improving the environmental adaptability of solid waste-based concrete and extending its service life.
作者
胡明星
鲁广庆
HU Mingxing;LU Guangqing(CITIC Construction Co.,Ltd.,Beijing 100020)
出处
《中国建材科技》
2025年第4期61-64,共4页
China Building Materials Science & Technology
关键词
固废基混凝土
硫酸盐侵蚀
干湿循环
力学性能
微观结构
solid waste-based concrete
sulfate attack
wet-dry cycles
mechanical properties
microstructure
