Therefore, the problem to be solved by the present invention is to provide
highly general purpose ultra high strength fiber-reinforced mortar or
concrete that shows a higher fluidity (workability) at the fresh state, a
higher bending strength with a less content of metal fiber by enhancing
both the absolute value of the compressive strength of mortar -matrix
excluding metal fiber and the ratio of the bending strength relative to
the compressive strength simultaneously at the hardened state, and
acceptability of fine aggregate being used in ordinary ready-mixed
concrete. An ultra high strength fiber-reinforced cement composition is
characterized in that it contains cement, silica fume, coal gasification
fly ash, gypsum and metal fiber and that the mass ratio of silica fume :
coal gasification fly ash is 95 through 50 portions: 5 through 50
portions. Ultra high strength fiber-reinforced mortar or concrete
contains such a cement composition and fine aggregate. An ultra high
strength cement additives is characterized in that it contains silica
fume, coal gasification fly ash and gypsum as principal ingredients and
the mass ratio of silica fume: coal gasification fly ash is 95 through 50
portions: 5 through 50 portions.