文献类型：期刊文献

英文题名：Strength characteristics of cement-reinforced recycled aggregate modified with nano-MgO as road bases

作者：Wang, Wei[1,2];Wang, Yuxiang[1];Lv, Beifeng[1];Li, Cuihong[1];Kong, Hanjun[1]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Natl Univ Singapore, Dept Civil & Environm Engn, Singapore 117576, Singapore

年份：2022

卷号：17

外文期刊名：CASE STUDIES IN CONSTRUCTION MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000864438000004)、、EI(收录号：20223712708688)、Scopus(收录号：2-s2.0-85137274959)、WOS

基金：Acknowledgments This research was funded by the National Natural Science Foundation of China (Grant no.: 52179107) .

语种：英文

外文关键词：Recycled aggregate; Strength characteristics; Mechanical test; Enhancement mechanism

外文摘要：In order to study the influence of nano-MgO on the strength characteristics of cement-reinforced waste road recycled aggregate (CRA), the California bearing ratio (CBR) test, unconfined compressive strength (UCS) test, scanning electron microscope (SEM) test, X-ray energy dispersive spectroscopy (EDS) test and X-ray diffraction (XRD) test were carried out. In the test of using nano-MgO modified cement-reinforced waste road recycled aggregates (MCRA), the cement content was fixed at 4 %, considering the two ages of 7 d and 28 d and the four types of nano-MgO content. The mechanical test results show that the addition of nano-MgO has a certain effect of improving mechanical properties; The CBR values of MCRA specimens with nano-MgO all meet the requirements of extremely heavy and extremely heavy traffic levels of expressways and firstclass highways; The unconfined compressive strength of 0.4 %MCRA can meet the heavy traffic grade requirements of expressways and first-class highways; 0.4 % is the optimum dosage of nano-MgO; The bivariate quadratic polynomial mathematical models of CBR value and unconfined compressive strength of MCRA specimens with nano-MgO content and age were established by curve fitting, and the fitting effect was ideal. Finally, the microscopic test was used to further analyze the internal mechanism of nano-MgO enhancing the strength of CRA.