From the results given in Fig. 4, the water absorption of the
specimens with crumb rubber was greater than that of the control
mix. The amount of water absorption gradually increased with the
increase in the percentage of crumb rubber in concrete. At 28 day,
the amount of water absorption of the mix with 0% crumb rubber
was 0.79%. It was 0.85% for the mixes with 10% crumb rubber and
maximum water absorption of 0.95% was observed for the mix
with 20% crumb rubber. At 84 day, the water absorption of control
mix was observed as minimum (1.06%), while the maximum
amount of water absorption (1.67%) was observed for the mix with
20% crumb rubber.