In this study, the main emphasis is placed on the development and characterization of alkali-activated binders completely produced by the use of mixed construction and demolition waste (CDW)-based masonry units as aluminosilicate precursors. Combined usage of precursors was aimed to better simulate the real-life cases since in the incident of construction and demolition, these wastes are anticipated to be generated collectively. As different masonry units, red clay brick (RCB), hollow brick (HB) and roof tile (RT) were used in binary combinations by 75–25%, 50-50% and 25–75% of the total weight of the binder. Mixtures were produced with different curing temperature/periods and molarities of NaOH solution as the alkaline activator. Characterization was made by the compressive strength measurements supported by microstructural investigations which included the analyses of X-ray diffraction (XRD) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX). Results clearly showed that completely CDW-based masonry units can be effectively used collectively in producing alkali-activated binders having up to 80 MPa compressive strength provided that the mixture design parameters are optimized. Among different precursors utilized, HB seems to contribute more to the compressive strength. Irrespective of their composition, main reaction products of alkali-activated binders from CDW-based masonry units are sodium aluminosilicate hydrate (N-A-S-H) gels containing different zeolitic polytypes with structure ranging from amorphous to polycrystalline.

在这项研究中，主要重点是通过混合使用基于建筑和拆除废物（CDW）的砖石单元作为铝硅酸盐前体完全生产的碱活化粘合剂的开发和表征。合并使用前体的目的是为了更好地模拟现实生活中的情况，因为在拆建事件中，这些废物预计将集体产生。作为不同的砌体单元，红粘土砖（RCB），空心砖（HB）和屋顶瓦片（RT）以二元组合的形式使用，占粘结剂总重量的75–25％，50-50％和25–75％ 。制备具有不同固化温度/时间和摩尔浓度的NaOH溶液作为碱性活化剂的混合物。通过抗压强度测量进行表征，该抗压强度测量得到微观结构研究的支持，其中包括对X射线衍射（XRD）和具有能量色散X射线光谱法（SEM / EDX）的扫描电子显微镜的分析。结果清楚地表明，只要优化了混合物设计参数，完全基于CDW的砌体单元就可以有效地共同用于生产抗压强度高达80 MPa的碱活化粘结剂。在使用的不同前体中，HB似乎对压缩强度的贡献更大。无论其组成如何，基于CDW的砌体单元的碱活化粘合剂的主要反应产物都是铝硅酸钠水合物（NASH）凝胶，其中包含不同的沸石多型体，其结构范围从无定形到多晶。