摘 要
随着全球对可持续发展的重视，绿色混凝土作为环境友好型建筑材料得到广泛应用，但其早期收缩问题严重影响结构性能与耐久性。本研究旨在系统探究绿色混凝土早期收缩的发展规律，并提出有效的抑制措施。通过设计不同配合比的绿色混凝土试件，采用非接触式收缩测定仪监测其早期收缩变化，结合热力学分析与微观结构表征手段，揭示收缩演化机制。研究结果表明，矿物掺合料和水胶比对早期收缩具有显著影响，适当掺加粉煤灰和矿渣可有效降低收缩值；同时，优化养护条件与添加膨胀剂能够改善混凝土内部结构，抑制收缩裂缝的产生。本研究创新性地提出了基于多因素耦合作用下的早期收缩预测模型，并验证了新型复合抑制措施的有效性。研究成果为绿色混凝土在实际工程中的应用提供了理论依据和技术支持，对其推广与发展具有重要意义。
关键词：绿色混凝土；早期收缩；矿物掺合料；收缩抑制措施；预测模型
ABSTRACT
With the increasing global emphasis on sustainable development, green concrete, as an environmentally friendly building material, has been widely applied; however, its early-age shrinkage significantly compromises structural performance and durability. This study aims to systematically investigate the development patterns of early-age shrinkage in green concrete and propose effective mitigation measures. By designing green concrete specimens with different mix proportions and employing a non-contact shrinkage measurement device to monitor early-age shrinkage changes, combined with thermodynamic analysis and microstructural characterization, the mechanisms underlying shrinkage evolution are elucidated. The results indicate that mineral admixtures and water-to-binder ratio have a significant influence on early-age shrinkage—appropriately incorporating fly ash and slag can effectively reduce shrinkage values. Furthermore, optimizing curing conditions and adding expansion agents can improve the internal structure of concrete and inhibit the formation of shrinkage cracks. This study innovatively proposes an early-age shrinkage prediction model based on multi-factor coupling effects and verifies the effectiveness of novel composite mitigation strategies. The findings provide a theoretical basis and technical support for the practical application of green concrete, contributing significantly to its promotion and further development.
Keywords: Green Concrete; Early Shrinkage; Mineral Admixtures; Shrinkage Control Measures; Prediction Model
目 录
摘 要 I
ABSTRACT II
第1章 绪论 2
1.1 研究的背景与意义 2
1.2 研究现状 2
1.3 本文研究方法与技术路线 2
第2章 绿色混凝土早期收缩类型与机理分析 4
2.1 绿色混凝土组成材料对早期收缩的影响 4
2.2 干燥收缩与自收缩的形成机制比较 4
2.3 温度变化对绿色混凝土早期收缩的作用 5
2.4 绿色混凝土早期收缩的多因素耦合效应 5
第3章 绿色混凝土早期收缩测试与评估方法 7
3.1 常用早期收缩试验方法及其适用性分析 7
3.2 收缩变形监测设备与数据采集系统 7
3.3 收缩性能评价指标体系构建 8
3.4 不同配合比条件下收缩行为对比实验 8
第4章 绿色混凝土早期收缩抑制措施研究 10
4.1 掺合料对早期收缩的调控作用 10
4.2 纤维增强对收缩裂缝的抑制效果 10
4.3 养护制度优化对收缩控制的影响 11
4.4 多元复合抑制措施协同作用分析 11
结论 12
参考文献 13
致 谢 14
