在结构应用的低碳水泥系统中轻量化SCC开发
Galal Fares1, Ahmed K El-Sayed1, Abdulrahman M Alhozaimy1
1Center of Excellence for Concrete Research and Testing, Department of Civil Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia.
Materials (Basel, Switzerland)
|June 28, 2023
概括
这项研究引入了一种新的混合序列,用于轻型自压缩混凝土 (SCC),使用积分. 这种方法提高了强度,并精确地控制了结构应用的特性.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 混凝土技术 混凝土技术
背景情况:
- 制造的轻质聚合物增加了混凝土成本,并使水与水泥比率的计算复杂化.
- 轻质聚合物的吸水减弱了聚合物矩阵的结合,损害了混凝土的强度.
- 加入轻质聚合物的传统方法导致不准确的水含量和性能降低.
研究的目的:
- 开发一种具有成本效益和高强度的轻量级自压缩混凝土 (SCC),使用渣聚合物 (SR).
- 为了克服与混凝土制备过程中轻质聚合物的水吸收相关的挑战.
- 优化四级混凝土系统,为具有增强性能的低碳足迹混凝土.
主要方法:
- 使用岩 (SR) 作为轻质聚合物,调整混合序列以最大限度地减少水的吸收.
- 首先准备了一种经过调整的风质的水泥糊,然后再添加SR聚合物.
- 优化了四级水泥系统,包括二氧化烟雾,飞和石灰尘.
- 评估新鲜性质 (倾斜流量,T50,J环,V道) 和硬化性质 (压力强度,曲负荷,破裂模量).
主要成果:
- 调整后的混合序列消除了对预浸泡聚合物的需求,改善了聚合物-矩阵键和总体强度.
- 优化的混合物在28天内实现了40MPa的目标压力强度,实际结果平均为42.7MPa.
- 新鲜性质处于可接受的范围内:沉流量 (790-800毫米),T50 (3.78-5.67秒),J环流量 (750-780毫米),V道 (9.17秒) 和密度 (1770-1800公斤/米3).
- 硬化性能包括超过2000N的屈曲负荷和6.2MPa的破裂模量.
结论:
- 改变混合序列对于在结构应用中使用高质量的轻质SCC中使用积体至关重要.
- 与传统的轻质混凝土实践相比,提出的方法显著提高了新鲜和硬化性能的精确控制.
- 开发的轻量级SCC为结构性使用提供了可行的,低碳足迹的替代方案.
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