公路工程高性能混凝土碱-骨料反应试验研究

Experimental study of alkali-aggregate reaction about high-performance concrete used in highway engineering

碱-骨料反应是影响混凝土耐久性的主要因素之一。正确判定骨料的碱活性是防治碱骨料反应的重要步骤。对安阳地区配制高性能混凝土所采用的粗细骨料进行了岩相法测试,得出含有碱硅活性成分。采用快速砂浆棒法,得出砂浆棒的膨胀率大于规定值,判定其为碱硅活性集料。对该地区选择粗细骨料提供参考依据,也为进一步采取抑制碱-集料反应措施提供依据。

Alkali-aggregate reaction is one important factor of influencing concrete durability.It is a important procedure to judge alkali-reactive of aggregate_kggregate materials used in high performance concrete in anyang region are detected by petrography and the result is that it contains al- kali-silicon reactive compositions.Expansibility of mortar-bar is greater than specified value when it is tested through rapid mortar-bar method.The conclusion has reference value to select aggregate materials and provide basis for taking measures to restrain alkali-aggregate reaction further.