The preparation of foam concrete frequently encounters challenges such as foam collapse and stratification, which lead to a decline in material performance. Therefore, enhancing foam stability is paramount in the production of foam concrete. This study innovatively addresses this issue by investigating the use of waste fly ash particles (RFA) and modified fly ash (AMFA, BMFA, and CMFA) as foam stabilizers, and comparing their efficacy with that of traditional nano-silica stabilizers (NS), both independently and in combination. The results indicate that modified ultrafine fly ash particles (AMFA) exhibit foam stability properties (1-h settlement distance and bleeding rate) comparable to those of NS. Moreover, when combined with NS, the mixture surpasses the foam performance of NS alone. Utilizing these highly stable foams, lightweight foam concrete with a 600 kg/m³ density is produced, demonstrating exceptional mechanical properties (compressive strength of 3.42 MPa) and superior thermal insulation (thermal conductivity of 0.0914 W/m· K). The enhanced foam stability of the modified fly ash is primarily attributed to increased surface roughness, hydrogen bonding, and van der Waals forces. Developing highly stable foams holds significant potential, contributing to energy conservation, emissions reduction, and waste management.

中文翻译：

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新型高效固体颗粒稳泡剂：改性粉煤灰对泡沫性能和泡沫混凝土的影响


泡沫混凝土的制备经常遇到泡沫塌陷和分层等挑战，从而导致材料性能下降。因此，在泡沫混凝土的生产中，提高泡沫稳定性至关重要。本研究通过研究废弃飞灰颗粒 （RFA） 和改性飞灰（AMFA、BMFA 和 CMFA）作为泡沫稳定剂的使用，并将它们与传统纳米二氧化硅稳定剂 （NS） 的功效进行比较，独立和组合使用，创新地解决了这个问题。结果表明，改性超细粉煤灰颗粒 （AMFA） 表现出与 NS 相当的泡沫稳定性（1 h 沉降距离和渗出速率）。此外，当与 NS 结合使用时，该混合物的泡沫性能超过了单独的 NS。利用这些高度稳定的泡沫，可以生产出密度为 600 kg/m³ 的轻质泡沫混凝土，表现出优异的机械性能（抗压强度为 3.42 MPa）和卓越的隔热性能（导热系数为 0.0914 W/m·改性粉煤灰的泡沫稳定性增强主要归因于表面粗糙度、氢键和范德华力的增加。开发高度稳定的泡沫具有巨大的潜力，有助于节能、减排和废物管理。