机场道面新型混凝土抗裂性试验

An Experimental Study on the Crack-proof Property of New-type Airfield Pavement Concrete

针对传统的普通道面混凝土施工后经常出现裂缝的现象,分析了裂缝产生的原因,提出在普通道面混凝土中掺加粉煤灰、聚丙烯纤维的新型道面混凝土,采用平板法进行了抗裂性能对比试验。结果表明:在普通道面混凝土中单掺粉煤灰或聚丙烯纤维,都能提高混凝土的抗裂性,而粉煤灰和聚丙烯纤维双掺的新型道面混凝土更能有效防止裂缝的发生,显著延长道面使用寿命。

In view of the phenomenon that the common pavement concrete is prone to crack upon its construction, analyses are made of the causes for such cracking, a new type of pavement concrete is developed by mixing the common concrete with fly ash and polypropylene fiber, and a test with plate specimen is adopted to fulfill the comparative test of crack - proof properties. The results of the test suggest that the common concrete, if mixed in proportion with either fly ash or polypropylene fiber, can improve its crack - proof property but the new - type concrete, mixed in proportion with both fly ash and polypropylene fiber at the same time, can more effectively prevent itself from cracking, thereby greatly prolonging the service life of the pavement.