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制备了掺加20%粉煤灰的高强混凝土(HSC)、复合掺加40%粉煤灰、10%矿渣和5%硅灰的大掺量矿物掺合料混凝土(HVMAC)和综合运用引气剂、高效减水剂、大掺量矿物掺合料、混杂纤维和膨胀剂技术的高耐久性混凝土(HDC),采用快冻法测定了混凝土在水和5%MgSO4(质量分数)溶液中的抗冻性。在冻融过程中对试件采用三分点加载方式,设定弯拉应力为破坏应力的35%。分析结果表明:与水中冻融条件相比,MgSO4溶液分别使HSC和HDC在应力作用下的抗冻性提高了46倍和70%以上,其抗冻融循环次数分别达到了425次以上和900次以上,但却使HVMAC在应力作用下的抗冻性降低了67%,抗冻融循环次数仅为75次。
High-strength concrete (HSC) mixed with 20% fly ash, high-volume mineral admixture concrete (HVMAC) mixed with 40% fly ash, 10% slag and 5% (HDC) with high content of mineral admixture, mixed fiber and expansive agent, the fast concrete method was used to determine the content of concrete in water and 5% MgSO4 (mass fraction) solution Frost resistance. In the process of freezing and thawing, the test specimen is loaded with one-third points, and the bending stress is set to 35% of the stress of destruction. The results showed that compared with the freezing and thawing conditions in water, MgSO4 solution increased the frost resistance of HSC and HDC by 46 times and 70% respectively under the action of stress, and reached 425 times and 900 cycles respectively However, HVMAC reduced the frost resistance under stress by 67% and anti-freeze-thaw cycles only 75 times.