Foam concrete is increasingly applied in construction due to its lightweight, good thermal insulation and fire resistance, and environmental sustainability, while its low strength limits its further popularization and applications. To enhance the stability and performance of foam concrete, amphiphilic nano silica (ANS) was employed in this study to modify the sodium dodecyl sulphate (SDS) based foaming agent. Then, the designed foam was utilized to fabricate foam concrete, of which the micro/macro performance was analysed in detail. The results showed that ANS-modified foam exhibited superior stability with a thicker foam wall thickness, contributing to the enhancement of foam stability within the cement matrix. The foam concrete with ANS exhibited higher strength compared to the control groups. The analysis of pore structures revealed that the ANS modification led to a more rounded and homogeneous pore configuration, characterized by an increased proportion of small and medium-sized pores and a decreased average pore size. The increase in pore roundness was accompanied by a reduction in the number of sharp edges of the pores and therefore a reduction in the stress concentration factor, while the moderately sized pore also was more conducive to increasing strength due to its lower stress concentration. As a result, the strength of the concrete is significantly increased. These findings demonstrate the potential of ANS as an effective foam stabilizer for foam concrete production, leading to enhanced foam stability and improved mechanical properties of concrete.

中文翻译：

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通过纳米二氧化硅工程实现超稳定泡沫，用于改善泡沫混凝土


泡沫混凝土因其轻质、良好的隔热防火性和环境可持续性而在建筑中得到越来越多的应用，但其强度较低限制了其进一步推广和应用。为了提高泡沫混凝土的稳定性和性能，本研究采用两亲性纳米二氧化硅（ANS）对十二烷基硫酸钠（SDS）基发泡剂进行改性。然后，利用设计的泡沫制备泡沫混凝土，并对其微观/宏观性能进行详细分析。结果表明，ANS 改性泡沫具有较厚的泡沫壁厚，表现出优异的稳定性，有助于提高水泥基体内的泡沫稳定性。与对照组相比，添加 ANS 的泡沫混凝土表现出更高的强度。孔隙结构分析表明，ANS 改性导致孔隙结构更加圆润和均匀，其特点是中小型孔隙比例增加，平均孔径减小。孔隙圆度的增加伴随着孔隙锐边数量的减少，因此应力集中系数降低，而中等尺寸的孔隙由于其较低的应力集中也更有利于增加强度。结果，混凝土的强度显着增加。这些发现证明了 ANS 作为泡沫混凝土生产的有效泡沫稳定剂的潜力，从而提高泡沫稳定性并改善混凝土的机械性能。