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在未加载与加载条件下,采用快冻法研究了快速碳化28 d后的普通混凝土(Ordinary Portland Cement Con-crete,OPC)、大掺量矿物掺合料混凝土(Concrete with High Content Mineral Admixture,HCMC)以及同时掺加混杂纤维、膨胀剂、引气剂和大量矿物掺合料的绿色高耐久性混凝土(Green High Durable Concrete,GHDC)在水和10%NaCl溶液中的抗冻性。结果表明,碳化作用降低了OPC和HCMC在NaCl溶液中的抗冻性,但能够改善GHDC在NaCl溶液中的抗冻性。在NaCl溶液的化学腐蚀及其与弯曲荷载的耦合作用下,碳化OPC与碳化HCMC很快发生冻融破坏,其破坏特征并非表面剥落,而是内部微裂纹的扩展。GHDC即使发生了严重的碳化作用,在NaCl溶液、弯曲荷载与冻融循环及其耦合作用下仍然具有非常高的耐久性能。
Under the condition of no loading and loading, the fast compaction method was used to study the effects of Ordinary Portland Cement Con-crete (OPC), Concrete with High Content Mineral Admixture (HCMC ) As well as the frost resistance of Green High Durable Concrete (GHDC) mixed in water and 10% NaCl solution simultaneously with the incorporation of miscellaneous fibers, expanders, air entraining agents and large amounts of mineral admixtures. The results showed that carbonation reduced the frost resistance of OPC and HCMC in NaCl solution, but could improve the frost resistance of GHDC in NaCl solution. Under the chemical corrosion of NaCl solution and its coupling with bending load, the carbonized OPC and carbonized HCMC quickly freeze-thaw damage, the destruction of which is not the surface flaking, but the expansion of the internal microcracks. Even with severe carbonation, GHDC still has very high durability under NaCl solution, bending load and freeze-thaw cycles and their coupling.