中国科技论文

针对提升大粒径透水性沥青混合料（large stone porous asphalt mixtures,LSPM）空隙率在工程检测中的准确性与可靠性的实际需求，结合山东省工程施工特点，对现场取芯及室内成型的LSPM-25试件进行界面加工处理，采用真空密封法和体积法检测其空隙率变化，并分析切割方式对检测结果的影响。研究表明：当采用真空密封法时，试件界面修整对空隙率结果影响较小，能准确反映芯样内部空隙分布；而采用体积法时，空隙率受试件切割规则性影响较大，切割越规则，结果越接近真空密封法检测结果。因此，为满足大粒径透水层（LSPM-25）空隙率工程检测需求，推荐2种适用于大粒径透水层（LSPM-25）芯样空隙率检测的切割方式：1）当仅铺筑大粒径透水层（LSPM-25）时，排除封层碎石嵌入的影响，仅需切除试件底部0.5 cm;2）当上层结构铺筑完成后取芯检测时，将芯样上、下两端各切除1.0 cm，并确保试件呈规则的圆柱体，以减小体积法与真空密封法检测结果的差异，确保数据稳定、准确。

To address the practical need for improving the accuracy and reliability of void content measurement of large stone porous asphalt mixtures(LSPM) in engineering testing, and considering the engineering construction characteristics of Shandong province, the interface processing was performed on the LSPM-25 specimens obtained from field coring and laboratory compaction. The vacuum sealing method and the volumetric method were used to measure the changes in void content and to analyze the influence of different cutting methods on the measurement results. The results indicate that when the vacuum sealing method is adopted, specimen interface trimming has little effect on the void content results, accurately reflecting the internal void distribution of the core samples. In contrast, when using the volumetric method, the void content results are significantly affected by the regularity of specimen cutting. The more regular the cutting, the closer the results are to those obtained by the vacuum sealing method. Therefore, to meet the engineering testing requirements for the void content of the LSPM-25 large stone permeable layer, two cutting methods suitable for void content measurement of LSPM-25 core samples are recommended: 1) When only the LSPM-25 large stone permeable layer is paved, to eliminate the influence of embedded seal aggregate, only 0. 5 cm of the bottom of the specimen needs to be cut off. 2) When coring for testing after the completion of the upper layer structure, cut off 1. 0 cm from both the top and bottom ends of the core sample to ensure a regular cylindrical shape, so as to reduce the difference between the volumetric method and the vacuum sealing method, and to ensure the stability and accuracy of the test data.