Cracking- resistance and flexural property of rubberized concrete

The cracking- r esistance and flexural propert y of the r ubberized concr ete wer e investigated based on thetests of paste, morta r and concrete specimens. The cr acking- resistance was eva luated based on the cracking time ofa ring specimen, which was prepared by incor porating waste tir e rubber particles in the cement paste, and threediffer ent water-cement rat ios ( 0. 3, 0. 4, 0. 5) and five different r ubber volume fractions( 10%, 15%, 20%, 30%,50%) were used. T he r esult s show that the addition of rubber par ticles dela ys the cracking time and improves thecr acking- r esistance of the specimens and the delayed t ime increases with the incr ease of t he water2 cement r atio andthe volume fraction of rubber particles. T he flexural propert ies wer e evaluated based on the bending tests of bothmort ar and concrete, four rubber volume fr actions ( 8%, 16%, 21. 4%, 32%) were used for mor tar and threerubber fractions ( 10%, 12. 5%, 15%) for concrete. The results show t hat the r ubberized mor tar and concr et e specimen exhibited ductile fa ilure and underwent signif icant deformation befor e fr actur e. The ultimate deformat ions ofboth mortar and concrete specimen increase substant ially compar ed to the contr ol specimens.