冻融和碳化共同作用下硅灰自密实混凝土耐久性试验研究

Experimental study on durability of silica fume self-compacting concrete under joint action of freeze-thawing and carbonization

为了研究冻融和碳化共同作用下硅灰自密实混凝土的耐久性,对不同强度等级的自密实混凝土和普通混凝土分别进行冻融试验、碳化试验和冻融碳化复合试验。试验结果表明:硅灰自密实混凝土的抗冻性能高于相同强度等级的普通混凝土,虽然前者的抗碳化性能略低于后者,但经过冻融作用后前者表现出更好的抗碳化性能;强度等级越高,硅灰自密实混凝土的抗冻性能和抗碳化性能越好。

In order to study the durability of silica fume self-compacting concrete under the joint action of freezing and carbonization,the freeze-thaw test,carbonization test and freeze-thaw carbonization test of the self-compacting concrete with different strength grades were carried out,and the general concrete was set up as a comparative study.The test results show that the frost resistance of silica fume self-compacting concrete is higher than that of the ordinary concrete with the same strength grade.Although the anti-carbonization property of the former is slightly lower than that of the latter,the former shows better anti-carbonization performance after freeze-thaw.The carbonation resistance performance of silica fume self-compacting concrete after freezing thawing is obviously higher than that of ordinary concrete.The higher the strength grade,the frost resistance performance and the carbonation resistance performance of silica fume self-compacting concrete are higher.