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Effect of recycled glass fines on mechanical and durability properties of concrete foam in comparison with traditional cementitious fines

机译：再生玻璃尺寸对混凝土泡沫机械和耐久性特性的影响与传统水泥粉

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This paper shows the potential benefits of using recycled glass fines as a sustainable and low-cost alternative compared to fly ash, silica fume and fine sand in concrete foam. One of the main concerns of using recycled glass in concrete is durability and particularly alkali-silica reaction (ASR). SEM-EDS analysis of the mortar with glass showed the formation of ASR gel with a higher silicon to calcium ratio around the glass particles which justified the large ASR expansion. On the other hand, microtomography analysis showed that the porous structure of concrete foam can accommodate the expansion of ASR gel inside the pores with considerably less expansion and no cracking. The majority of the pores filled with ASR gel are at the outer edge of the sample which was in contact with the alkaline solution. The smaller pores are more likely to be filled with ASR gel compared to the larger pores. Replacement of 10 wt% of Portland cement with milled glass resulted in higher strength compared to the other cementitious materials because of better compaction within the binder and pore strengthening effect due to rearrangement of pore sizes, as well as reduction of the unit weight. Recycled glass slightly decreased water absorption but substantially reduced the drying shrinkage of concrete foam.
机译：本文显示了与混凝土泡沫混凝土泡沫的粉煤灰，二氧化硅烟雾和细砂相比，使用再循环玻璃料作为可持续和低成本替代品的潜在益处。使用混凝土中使用再循环玻璃的主要问题之一是耐久性，特别是碱性二氧化硅反应（ASR）。用玻璃的砂浆的SEM EDS分析显示，在玻璃颗粒周围的钙比中形成ASR凝胶的形成，这些玻璃颗粒呈大学膨胀。另一方面，微微映射分析表明，混凝土泡沫的多孔结构可以容纳孔内ASR凝胶的膨胀，相当较少的膨胀，没有开裂。填充有ASR凝胶的大部分孔位于样品的外边缘，其与碱性溶液接触。与较大的孔相比，较小的孔更有可能填充ASR凝胶。更换10wt％的波特兰水泥用研磨玻璃，与其他水泥材料相比，强度更高，因为由于孔径重排，并且孔径重排，并且单位重量减少，因此在粘合剂和孔加固效果中更好地压实。再生玻璃略微降低吸水性，但大大降低了混凝土泡沫的干燥收缩。

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