Electric current rectification, though not perfect, was attained by using a
junction (pn or nn(+)) between cement pastes with different extents n- or
p-type character. The n-type character was enhanced by using steel fibers a
s an admixture. The p-type character was enhanced by using carbon fibers as
an admixture. (C) 2001 Elsevier Science Ltd. All rights reserved.