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%.
Steps to reproduce
After collecting POFA from palm oil mill, POFA treated by oven dried at 100±5°C for 24 hours and reduce the size into ultrafine size using Los Angles abrasion machine. With 26 stainless steel which has 12 mm in diameter and 250 mm in length were used to reduce size of 4 kg POFA at 30,000 cycles to get the ultrafine size. To ensure the average size of the particles, particle size analyzer was used to check POFA size. For samples making, all the samples are made based on ASTM C1260. Dimension of the samples are 25 mm width, 25 mm height, and 280 mm length. After mixing the materials (cement, POFA, coarse aggregate and water), specimens left for 24 hours before demolded. After 24 hours, first reading were taken. After wards, the specimens fully immersed in container which contain water for 24 hours at 80±2°C for 28 days. Measurements were taken for 1st, 3rd, 7th, 14th, 21st, and 28th day.