| 摘要: |
| 采用偏高岭土（MK）对NaOH预处理橡胶混凝土进行改性并对其进行力学性能试验，同时结合扫描电镜（SEM）、压汞仪（MIP）和热重分析仪（TG-DTG），探究了MK对橡胶混凝土孔隙结构特征和水化产物含量的影响.结果表明：掺加MK能够提高改性橡胶混凝土水化产物的生成量，改善骨料与胶凝材料界面过渡区的质量，细化橡胶混凝土的孔隙结构，减少其内部孔隙率，进而提高橡胶混凝土的力学性能；改性橡胶混凝土的力学性能随着MK掺量的增加先上升后下降，当MK掺量为15%时，改性橡胶混凝土力学性能的提升最为显著. |
| 关键词: 偏高岭土 NaOH预处理 橡胶混凝土 力学性能 界面过渡区 孔隙结构 |
| DOI：10.3969/j.issn.1007-9629.2024.07.003 |
| 分类号:TU528.37 |
| 基金项目:国家自然科学基金资助项目（51968053，52268071）；内蒙古自治区杰出青年科学基金资助项目（2023JQ03）；内蒙古大学高层次人才科研启动基金项目（10000-22311201/008） |
|
| Effect of Metakaolin on Mechanical Properties of NaOH Pretreated Rubber Concrete |
|
JIANG Xiaodong1, ZHANG Hong1, LI Chuang1, REN Yongfeng1, XU Jun2
|
|
1.Transportation Institute ， Inner Mongolia University ， Hohhot 010070 ， China;2.Inner Mongolia Road and Bridge Group Co.， Ltd.， Hohhot 010010 ， China
|
| Abstract: |
| The modified rubber concrete’s mechanical properties were evaluated after adding metakaolin to NaOH pretreated rubber concrete. The impacts of metakaolin on pore structure characteristics and hydration product content of the material were analyzed using scanning electron microscopy（SEM）， mercury porosimeter（MIP） and thermal gravimetric analyzer（TG-DTG）. The results show that incorporating metakaolin in modified rubber concrete can enhance the quantity of hydration products， improve the interfacie transition zone quality amidst the aggregate and cementitious material， refine the pore structure， and reduce internal porosity， resulting in improved mechanical properties. The mechanical properties of the modified rubber concrete exhibit an initial increase and then a decrease with rising metakaolin content， with the most significant improvement observed at a content of 15%. |
| Key words: metakaolin NaOH pretreatment rubber concrete mechanical property interface transition zone pore structure |
