  We prove a ballistic strong law of large numbers and an invariance principle
for random walks in strong mixing environments, under condition $(T)$ of
Sznitman (cf. \cite{Sz01}). This weakens by first time the Kalikow ballistic
assumption in mixing and proves finite moments of arbitrary order for the
approximate regeneration time of \cite{CZ02}. The main technical tool in the
proof is the introduction of renormalization schemes, which had only been
considered for i.i.d. environments.
