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Microstructure of high-strength foam concrete

机译：高强度泡沫混凝土的微观结构

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摘要

Foam concretes are divided into two groups: on the one hand the physically foamed concrete is mixed in fast rotating pug mill mixers by using foaming agents. This concrete cures under atmospheric conditions. On the other hand the autoclaved aerated concrete is chemically foamed by adding aluminium powder. Afterwards it is cured in a saturated steam atmosphere. New alternatives for the application of foam concretes arise from the combination of chemical foaming and air curing in manufacturing processes. These foam concretes are new and innovative building materials with interesting properties: low mass density and high strength. Responsible for these properties are the macro-, meso- and microporosity. Macropores are created by adding aluminium powder in different volumes arid with different particle size distributions. However, the microstructure of the cement matrix is affected by meso- and micropores. In addition, the matrix of the hardened cement paste can be optimized by the specific use of chemical additives for concrete. The influence of aluminium powder and chemical additives on the properties of the microstructure of the hardened cement matrices were investigated by using petrographic microscopy as well as scanning electron microscopy.
机译：泡沫混凝土分为两类：一方面，使用发泡剂将物理发泡的混凝土在快速旋转的哈巴搅拌机中进行混合。这种混凝土在大气条件下固化。另一方面，高压灭菌的加气混凝土通过添加铝粉进行化学发泡。之后，将其在饱和蒸汽气氛中固化。在制造过程中，化学发泡和空气固化相结合，产生了泡沫混凝土应用的新选择。这些泡沫混凝土是新型的创新建筑材料，具有令人感兴趣的特性：低质量密度和高强度。负责这些性质的是大孔，中孔和微孔。大孔是通过添加不同体积和不同粒度分布的铝粉而产生的。但是，水泥基质的微结构受中孔和微孔的影响。此外，硬化水泥浆的基质可以通过混凝土中化学添加剂的特殊使用来优化。通过石化显微镜和扫描电子显微镜研究了铝粉和化学添加剂对硬化水泥基体微观结构性能的影响。

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