VCAAC级配检验方法在施工中的应用

Application of aggregate gradation test method of VCA_(AC) in highway construction

通过沥青混合料SAC13试验段的铺筑,介绍了VCAAC(沥青混凝土粗集料体积分数)矿料级配检验方法在施工过程中的具体应用,提出应用VCAAC矿料级配检验方法的技巧。试验段施工过程中先用VCAAC方法对室内设计级配的目标配合比和生产配合比进行检验,使之形成符合设计要求的紧密骨架密实结构,且保证其沥青混合料的路用性能良好,进而进行试验段的铺筑及铺筑后的检测,最后根据检测结果将现场不符合要求的矿料级配利用VCAAC方法调整到符合要求的矿料级配。研究结果表明:利用VCAAC方法对现场孔隙率较大的矿料级配进行调整后,其现场孔隙率等各项指标均满足要求;VCAAC方法应用简便、灵活,能为实际工程中矿料级配调整到合适级配提供理论依据。

Through the construction of test section for SAC13, this paper introduces the application of VCAAC method. The skill for the application of VCAAC method is also put forward. During the construction of test section, the test for target mixture rate and manufacture mixture rate is conducted by use of the VCAAC method so that the gradation is satisfied with the requirement of skeleton dense structure and the performance of asphalt mixture is good. Then, the test section is constructed and the test is done. Finally, the VCAAC method is used to adjust the aggregate gradation in order to satisfy the requirement according to the test results. The results indicate the VCAAC method is used to adjust the aggregate gradation of which the void content at spot is larger and the gradation adjusted is approved well by the test section. The research indicates the method of VCAAC is convenient, flexible. In addition, this method also provides the theoretical reference for the gradation adjustment in actual project. 20 tabs, 11 refs.