Data on ability of unground and ultrafine palm oil fuel ash in reducing mortar bar expansion due to alkali-silica reaction.

Data from SEM shows the surface structure of the unground and ultrafine POFA. Unground POFA surface structure is more porous compared to ultrafine POFA, where almost no porous found on the ultrafine POFA surface structure. Expansion graph shows that expansion of mortar bar due to the alkali-silica reaction (ASR). Mortar bar expansion which is more than 0.2% considered as highly reactive and below 0.1% considered as non-reactive. For unground POFA, as 40%-50% POFA replacement has the ability to reduce the mortar bar expansion below 0.1%. Compare to ultrafine POFA, mortar bar expansion can be reduced below 0.1% by replacement minimum 20%.扫描电子显微镜（Scanning Electron Microscope, SEM）观测得到的图像，展示了未磨细与超细型棕榈油燃料灰（Palm Oil Fuel Ash, POFA）的表面微观结构。相较于超细POFA，未磨细POFA的表面孔隙更为发达；而超细POFA的表面几乎无可见孔隙。膨胀测试曲线显示，砂浆棒的体积膨胀由碱硅反应（Alkali-Silica Reaction, ASR）引发。行业通用判定标准为：砂浆棒膨胀率超过0.2%时被视为高反应活性，低于0.1%时则被视为无反应活性。对于未磨细POFA，当其取代胶凝材料的掺量为40%~50%时，可将砂浆棒膨胀率降至0.1%以下。相较于未磨细POFA，超细POFA仅需最低20%的取代掺量，即可将砂浆棒膨胀率控制在0.1%以内。