Aggregate surface roughness has a significant effect on the interfacial transition zone of concrete. For this study, concrete specimens were prepared from five crushed natural coarse aggregates with varying surface roughnesses obtained from five different sources. The influence of polymer latex and mineral admixtures such as metakaolin, silica fume, slag, and fly ash were also studied. The effect of surface roughness on the interfacial transition zone was characterized by microhardness testing. The microhardness test results were validated via energy-dispersive X-ray spectroscopy (EDS) and scanning electron microscopy (SEM) analysis. The results showed that surface roughness has a prominent effect on microhardness of the transition zone and the effect significantly increases with the addition of cementitious materials. Polymer latex showed a slight influence on the microhardness while the effect of cementitious materials was found to be profoundly increased.

骨料表面粗糙度对混凝土的界面过渡区有重要影响。对于本研究，混凝土试样是由五种粉碎的天然粗骨料制备而成的，这些粗骨料具有从五种不同来源获得的变化的表面粗糙度。还研究了聚合物胶乳和矿物混合物（如偏高岭土，硅粉，矿渣和粉煤灰）的影响。通过显微硬度测试来表征表面粗糙度对界面过渡区的影响。显微硬度测试结果通过能量色散X射线光谱（EDS）和扫描电子显微镜（SEM）分析得到验证。结果表明，表面粗糙度对过渡区的显微硬度有显着影响，并且随着胶结材料的添加，其影响显着增加。