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）获取的数据展示了未磨细与超细POFA的表面结构。未磨细POFA的表面孔隙相较于超细POFA更为发达，而超细POFA表面几乎无孔隙。膨胀曲线显示，砂浆棒的膨胀由碱硅反应（alkali-silica reaction, ASR）诱发。当砂浆棒膨胀率超过0.2%时，被判定为高反应性；膨胀率低于0.1%时，则判定为非反应性。对于未磨细POFA，当其替代掺量为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%的替代掺量，即可将砂浆棒膨胀率降至0.1%以下。