沥青混合料降温特性及有效碾压时间的研究

为了分析沥青混合料降温特性及其影响因素,通过室内测试密级配沥青混合料AC-13和大空隙沥青混合料OGFC-13的降温曲线,分析在不同试件厚度、深度、环境温度和空隙率下的降温特性,并计算有效碾压时间。结果表明:沥青混合料降温速率随着试件厚度、深度与环境温度的增加而逐渐降低,有效碾压时间也随之增长;密级配沥青混合料的降温速率、有效碾压时间与空隙率的关系不大,而大空隙沥青混合料的降温速率与有效碾压时间则与空隙率密切相关;建立了以厚度、气温、空隙率作为变量的沥青混合料有效碾压时间的预估模型。

Study on Cooling Performance and Effective Rolling Time of Asphalt Mixture

To analyze asphalt mixture’s cooling performance and the effect factors, the cooling curves of the dense-graded asphalt mixture AC-13 the large-void asphalt mixture OGFC-13 were studied by indoor tests, thus the cooling performance thereof under different specimen parameters, i.e. thickness, depth, ambient temperature and porosity, was analyzed, with the effective rolling time calculated. The results show that asphalt mixture has the cooling performance decreased with the increment of specimen’s thickness, depth and ambient temperature, and the effective rolling time grows as well; dense-graded asphalt mixture has the cooling rate and the effective rolling time hardly relating to porosity, while large-void asphalt mixture closely relating to porosity. Finally, the prediction model for effective rolling time of asphalt mixture, which takes thickness, air temperature and porosity as variables, was established.