Concrete Performance Using Low-Degradation Aggregates

摘要: The durability of Portland cement concrete (PCC) has long been identified as a concern by transportation communities around the United States. In this study, long-term performance two batches incorporating either low-degradation (LD) or normal (NM) aggregates subjected to freezing and thawing conditions was experimentally studied. test method (ASTM C666) followed condition all samples. Dynamic modulus fracture energy for both groups samples after different numbers freeze-thaw cycles were measured through nondestructive modal cohesive tests, respectively. Due higher air content in LD concrete, surface scaling less severe under frost action. Test results showed that aggregate degradation an important effect on resistance rate decrease with number is than NM concrete. Compared dynamic elasticity, more sensitive parameter evaluating caused Thus, can be better evaluated test. Additional research needed identify appropriate threshold when properties become concern. Until time, it recommended WSDOT maintain their current restrictions using