Effect of temperature on resilient modulus and shear strength of unbound granular materials containing fine RAP
Effect of temperature on resilient modulus and shear strength of unbound granular materials containing fine RAP
复制标题
DOI：
10.1016/j.conbuildmat.2016.08.137
复制
发表时间：
2016-10
影响因子：
7.4
通讯作者：
Y. Miao;Yucheng Huang;Qunqun Zhang;Linbing Wang
中科院分区：
文献类型：
--
作者：
Y. Miao;Yucheng Huang;Qunqun Zhang;Linbing Wang
本文的目的是研究温度对未粘结颗粒材料（UGMs）与再生沥青路面（RAP）和原始集料混合作为路面基层的力学性能的影响。为此，在40°C、22°C、5°C和−10°C的不同温度下，对含RAP的间隙级配、连续级配和粗级配ugm （RAP- ugm）以及纯原生聚集体的ugm （va - ugm）进行了一系列实验室试验，包括重复载荷三轴试验（RLT）和快剪试验。此外，还对一组冻融循环的试样进行了试验，以评估其对冻融循环的敏感性。结果表明，温度对RAP-UGMs和VA-UGMs的Mr和抗剪强度均有显著影响。与va - ugm相比，rap - ugm在非冻结温度下具有相当的Mr。而RAP的加入明显降低了ugm的抗剪强度。RAP-UGMs和VA-UGMs在- 10°C时Mr的增长都非常显著，而RAP-UGMs的增长明显低于VA-UGMs。此外，RAP-UGMs比VA-UGMs更不容易受到F-T周期的影响。RAP的加入提高了ugm的抗F-T能力。
The objective of this paper is to investigate the effect of temperature on mechanical properties of unbound granular materials (UGMs) blended with reclaimed asphalt pavement (RAP) and virgin aggregates as the base course of pavement. To this end, a series of laboratory tests including the repeated load triaxial test (RLT) and the quick shear test was performed on gap graded, continuous graded and coarse graded UGMs containing RAP (RAP-UGMs) as well as UGMs of neat virgin aggregates (VA-UGMs) at varying temperatures, 40 °C, 22 °C, 5 °C, and −10 °C. In addition, one set of specimens subjected to a freeze-thaw (F-T) cycle was tested to evaluate the susceptibility to that. It is found that temperature has significant effects on Mr and shear strength of both RAP-UGMs and VA-UGMs. Compared to VA-UGMs, RAP-UGMs exhibit fairly comparable Mr at non-freezing temperatures. However, the addition of RAP apparently lowers the shear strength of UGMs. For both RAP-UGMs and VA-UGMs, Mr has very significant growth at −10 °C compared to non-freezing temperatures while the growth for RAP-UGMs is apparently lower than that for VA-UGMs. Moreover, RAP-UGMs are less susceptible to the F-T cycle than VA-UGMs. And the addition of RAP improves the F-T resistance of UGMs.