Abstract
The effect of rice husk ash and natural zeolite on preventing expansion due to alkali-aggregate reaction was investigated according to mortar-bar method (JIS A 1146). The changes in length of mortar bars containing rice husk ash or natural zeolite were measured at different ages up to 2. years and compared with those containing various mineral admixtures such as silica fume, fly ash and blast furnace slag. The results confirmed that the expansion caused by reactive aggregates can be controlled by adding 10 % rice husk ash or 15 % natural zeolite by weight of the total cementing material. The observed differences in the expansion behaviors among mortars with various mineral admixtures were also determined and discussed.
