合石膏和循环精细粉末多源固体废物地质聚合物的协同机制和稳定性评估
1School of Civil Engineering, Central South University, Changsha 410075, China.
Polymers
|June 28, 2023
概括
将石膏和回收精细粉末地质聚合物结合起来,可以创建稳定的材料. 这种协同作用通过控制结石形成和毛细血管应力来增强体积,水和机械稳定性.
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.
- 废物管理 废物管理
背景情况:
- 来自固体废物的地质聚合物提供了高价值.
- 石地质聚合物有扩张的风险;回收精细粉末地质聚合物表现出收缩.
- 结合这些材料可以利用协同效应来提高稳定性.
研究的目的:
- 为了研究将石膏,回收精细粉末和渣结合在地质聚合物制剂中的协同效应.
- 分析这些复合地质聚合物的增强稳定性背后的微机制.
- 评估开发的地质聚合物的体积,水和机械稳定性.
主要方法:
- 复合地质聚合物的制备,使用不同比例的,回收精细粉末和渣.
- 测试体积稳定性,水稳定性和机械性能 (软化系数).
- 微观分析以了解稳定性协同机制,包括结石 (AFt) 形成和毛细血管应力控制.
主要成果:
- 协同效应有效地控制了ETtringite (AFt) 生产和毛细血管应力,显著改善了体积稳定性.
- 改善的孔隙结构和减少硫酸二水合物 (CaSO4·2H2O) 的负面影响提高了水的稳定性.
- 一种含有45%重量回收细粉末的地质聚合物 (P15R45) 的软化系数比P35R25高26.2%,表明机械稳定性提高.
结论:
- 石膏,回收精细粉末和渣的组合创造了一个协同效应,增强了地质聚合物的稳定性.
- 这种协同作用可以减轻膨胀裂纹和体积收缩问题,从而产生更好的体积,水和机械稳定性.
- 开发的复合地质聚合物代表了将固体废物价值化为稳定的建筑材料的有希望的方法.
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