荷载作用下高强混凝土的抗冻性

混凝土的损伤是一个多因素复合作用的结果。本文研究了引气（ＡＰＣ）和非引气（ＮＰＣ）高强混凝土在三分点加荷受弯和冻融循环同时作用下的损伤过程、机理。通过０％、１０％、２５％、５０％４个荷载比例作用下混凝土的抗冻性比较，分析了荷载和引气对混凝土抗冻性的影响。结果表明，荷载和冻融循环双因素作用下，荷载比例较大时，混凝土试件的破坏主要是荷载在冻融引起的微裂缝处产生应力集中，使微裂缝迅速扩展造成混凝土破坏。

Frost Resistance of High Strength Concrete on Preloading Flexural Stress

Concrete damage is the result of the action of many factors. This paper presents the effect of external flexural load on the frost resistance of high strength concrete with and without air entrained. The preloading flexural stress range from 0 to 50 percent of the modulus of rupture of specimens. It is shown that the damage of concrete specimens with high level preloading stress is primarily caused by stress concentration where the microcracking is initialed by freezing thawing cycles. Freezing thawing cycles is the main reason for the damage of concrete specimens with low level preloading.