The assessment of the aggregate suitability for concrete pavements applies mainly to coarse aggregate. However, even fine aggregate can significantly affect the long-term durability of concrete when it is susceptible to alkali-silica reaction (ASR). The sustainable use of available fine aggregates for the production of concrete, while reducing the effects of ASR, requires special preventive measures. The paper proposed different procedures to determine the chemical composition of aggregate and the related ASR risk. The study covers various properties of natural fine aggregates from glacial deposits. The experiments included determination of chemical composition by prompt gamma activation analysis (PGAA), quantitative mineralogical characterisation on thin sections using digital image procedure (DIP) and expansion measurements in mortar bar test (MBT). The strong correlation of sand origin and its susceptibility to ASR was observed. Content of micro- and cryptocrystalline quartz in siliceous sand was found to have a crucial effect on its performance in AMBT.

Highlights

• The different testing procedures to determine the chemical composition of aggregate and the related ASR risk are proposed.

• The ASR expansion of a various origin sands was studied.

• The origin of the siliceous sand has a significant effect on its alkali-silica reactivity.

• The max. content of reactive quartz regarding ASR is determined.

混凝土路面骨料适用性的评估主要适用于粗骨料。然而，当它对碱硅反应 (ASR) 敏感时，即使是细骨料也会显着影响混凝土的长期耐久性。可持续地使用可用的细骨料生产混凝土，同时减少 ASR 的影响，需要特殊的预防措施。该论文提出了不同的程序来确定骨料的化学成分和相关的 ASR 风险。该研究涵盖了来自冰川沉积物的天然细骨料的各种特性。实验包括通过快速伽马活化分析 (PGAA) 确定化学成分，使用数字图像程序 (DIP) 和砂浆棒测试 (MBT) 中的膨胀测量对薄片进行定量矿物学表征。观察到砂源与其对 ASR 的敏感性之间存在很强的相关性。发现硅砂中微晶和隐晶石英的含量对其在 AMBT 中的性能有至关重要的影响。

强调

• 提出了确定骨料化学成分和相关 ASR 风险的不同测试程序。

• 研究了各种原砂的 ASR 膨胀。

• 硅质砂的产地对其碱硅反应性有显着影响。

• 最大。测定与 ASR 相关的活性石英含量。