| dc.description.abstract | There are three primary objectives in this research. The first is to evaluate the affect of reaction of Li＋, Na＋, K＋ to reactive aggregate powder. Second is to determine the combination of Li＋, Na＋, K＋ in hydration product. The third is to evaluate the suppression function by assessing the reactivity in the utilization of lithium ion as a replacement in cment hydration products combination or ASR gel.
The materials used for the experiments are Ton-River aggregate, Pyrex glass and silica. In addition, alkali composition used include NaOH, KOH, LiOH. H2O and LiNO3.
The result shows that reaction of Li＋, Na＋, K＋ affects the reactive powder. The immersion of reactive aggregate in Na＋, K＋ will give added timing which will cause the dissolution of silica content, drop of hydroxil ions and an increase in Na＋, K＋. However, when immersed in Li＋ liquid, the reduction of hydroxyl ions will increase and dissolution of silica content will be lower. The dramatic reduction due to Li＋ prove that Li＋reactivon to the reactive aggregate are more direct. Its lower dissolution prevented the swelling of the material.
Regarding the Li＋, Na＋, K＋ combination of hydrationn products, the research discover that the proportion of the hydration product are Li＋> Na＋> K＋. The implication of this is that the quantity of the admixture should be adequate to prevent the ASR from swelling while Li composition is added. The combination of LiNO3 proportion shall be greater than LiOH.H2O.
With regards to the reactivity in the utilization of Li＋ in replacing the cement hydration product combination, it is discovered that the capacity of replacement by LiNO3 is better than LiOH.H2O. In addition, the increase in Li＋ concentration and the increase in the duration of immersed time will increase the replacement. This implies that the spray or immersion approach is good for correction of structure damaged by ASR. However further evaluation requires more time.
| en_US |