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Tire rubber �articles (NaOH-treated and untreated) were in�estigated as �ossible crack stabilizer and toughness enhancer when added to cement �aste through in situ crack �ro�agation measurements using two different ty�es of cement, ty�e I/II and an Interground �oly�ro�ylene Fiber �ement (IF�). �rack deflection and crack bridging were obser�ed in s�ecimens with untreated rubber in cement ty�e I/II. �rack ti� mechanisms associated with crack �inning and crack arrest were �resent in ty�e I/II cement and IF� with treated rubber �articles. �rack ti� mechanisms in IF� with treated rubber lead to the increase in �MOD at the ultimate load le�el. �rack wake mechanisms in IF� with untreated or treated rubber lead to strain hardening and strain softening beha�ior. �rack wake bridging mechanisms were re�laced by multi�le cracking mechanisms in the IF� s�ecimens with treated rubber. The IF� s�ecimens with untreated rubber inclusions �ro�ided the best results with res�ect to toughness enhancement.

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