根据岩滩工程围堰少水泥碾压混凝土芯样的微观、亚微观及部分宏观性能试验结果，对该混凝土５年龄期性能进行了讨论，认为少水泥高掺粉煤灰碾压混凝土５年龄期时水化产物正常、稳定、结构致密。水化产物中仍存在Ｃａ（ＯＨ）２，随着龄期的延长，粉煤灰还会不断水化，混凝土的强度仍在增长，孔结构不断改善。５年龄期时混凝土层面的抗剪强度比９０ｄ龄期时改善。 According to the microscopic, submicroscopic and partial macro-performance test results of rock cofferdam less cofferdam, the 5-year performance of the concrete is discussed. It is concluded that the 5-year age of low-cement and fly ash- Hydration products when normal, stable, compact structure. Hydration products still exist Ca (OH) 2, with age, fly ash will continue to hydration, the strength of concrete is still growing, the pore structure continues to improve. The shear strength of concrete in 5-year age is better than that in 90d.