In Fig. 3, it reveals that the elongation is decreased as latex is increased since the long-range order of rubber molecules is increased. This means that adding latex into mortar improves the bond in mortar. In comparison with the ages of mortar, the elongation at 28 days is greater than that at 14 days around 0.0005-0.001 %.
In Fig. 4 and 5, the compressive and bending strengths of mortar increases as ages of mortar increases. However both strengths decreases as latex increases since the increase of latex affects the thicker layer of film covering the aggregates and results in softening surface around the aggregates which is the cause of reducing of the strengths. Another reason is the increase of latex into the mortar means the water-cement ratio is also increased which normally makes the lower strengths in mortar [31].