This study investigates ground brick waste powder as a primary precursor to develop eco-friendly geopolymer foam concrete (BGFCs) using a chemical foaming method. The effect of alkali content on the reaction kinetics of brick powder is studied and correlated with the properties of BGFCs. The reaction rates and the formation of crystalline phases of BGFCs were identified by Fourier Transform Infrared Spectroscopy and X-Ray Diffraction test method, respectively. It is found that increasing the alkali content (Na₂O) in the mix has significantly enhanced the reaction kinetics of brick powder with the rapid formation of geopolymer gel in the matrix. This has resulted in the enhancement of mechanical properties and rapid setting in BGFCs. For instance, the increase in Na₂O concentration from 1:40 to 1:12 has increased the compressive strength of BGFC by 245%. The corresponding initial setting times were reduced from 315 min to 140 min. The rapid setting of geopolymer mixture has resulted in a fine, regular, and homogenous distribution of air voids in the BGFCs. Finally, carbon emission calculations were conducted to assess the environmental impacts of developed BGFCs and compared with Ordinary Portland cement (OPC) foamed concrete. It is found that the developed BGFCs could significantly reduce the carbon emission up to 60% compared to their OPC counterparts.

本研究将磨碎的废砖粉作为使用化学发泡方法开发生态友好型地质聚合物泡沫混凝土 (BGFC) 的主要前体。研究了碱含量对砖粉反应动力学的影响，并将其与 BGFCs 的性能相关联。BGFCs的反应速率和晶相的形成分别通过傅里叶变换红外光谱和X射线衍射测试方法进行鉴定。结果表明，增加混合物中的碱含量 (Na ₂ O) 可显着增强砖粉的反应动力学，并在基质中快速形成地质聚合物凝胶。这导致了 BGFC 的机械性能和快速凝固的增强。例如，Na ₂的增加O 浓度从 1:40 到 1:12 使 BGFC 的抗压强度提高了 245%。相应的初始凝固时间从 315 分钟减少到 140 分钟。地质聚合物混合物的快速凝固导致了 BGFC 中气孔的精细、规则和均匀分布。最后，进行碳排放计算以评估开发的 BGFC 的环境影响，并与普通波特兰水泥 (OPC) 泡沫混凝土进行比较。研究发现，与 OPC 同类产品相比，开发的 BGFC 可以显着减少高达 60% 的碳排放。