Waste andesite dust (WAD) occurs during sawing and other stone dressing processes of andesite stone. The disposal of WAD may cause storage and environmental pollution problems. The use of WAD in geopolymer production may be a solution to these problems. The mechanical and microstructural properties of geopolymer mortars synthesized from WAD were investigated in this work. To investigate these properties, the geopolymer mortars were manufactured using WAD with different molarity variations of NaOH as alkali-activator. The produced fresh WAD-based geopolymer mortars were cured at 100 °C in three different periods (12, 24, and 48 h). The results revealed that the ultrasonic pulse velocity (U_pv), flexural strength (f_fs), compressive strength (f_cs) of WAD-based geopolymer mortars increased as increasing NaOH molarity until reaching an optimum concentration (12 M for this work). Curing periods also significantly affected the mechanical and microstructural properties of WAD-based geopolymer mortars. The results showed that the higher f_fs and f_cs values can be obtained with a longer curing periods. Moreover, considering overall performance analysis, geopolymer synthesis with WAD promises a solution for sustainable mortar production and waste elimination.

在安山石的锯切和其他修整过程中会产生废物安山岩粉尘（WAD）。WAD的处置可能会导致存储和环境污染问题。在地质聚合物生产中使用WAD可以解决这些问题。在这项工作中，研究了由WAD合成的地聚合物砂浆的力学和微观结构性能。为了研究这些性能，使用具有不同摩尔浓度的NaOH作为碱活化剂的WAD制造了地聚合物砂浆。将生产的新鲜基于WAD的地质聚合物砂浆在三个不同的时间段（12、24和48小时）中在100°C下固化。结果表明，超声脉冲速度（U _pv），弯曲强度（f _fs），抗压强度（fWAD基地质聚合物砂浆的_cs）随着NaOH摩尔浓度的增加而增加，直到达到最佳浓度（此工作为12 M）。固化时间也显着影响基于WAD的地质聚合物砂浆的机械和微观结构性能。结果表明，在更长的固化时间内可以获得更高的f _fs和f _cs值。此外，考虑到整体性能分析，采用WAD的地聚合物合成有望成为可持续砂浆生产和消除废物的解决方案。