Recently, the constructions industry begins to make concrete more sustainable, side
by side, with making its high performance. This paper aims to investigate the effect
of (Metakaolin and Micro Silica) when they replace cement by (8, 12 and 16) %
and (6, 9 and 12) % respectively, recycled steel slag when replaces fine aggregate
by (10, 20 and 30) %, and recycled mosaic tiles when replaces coarse aggregate by
(33.33, 66.67 and 100) % each one another on the slump, density, absorption and
compressive strength of concrete. The experimental results showed that the
maximum reduction ratio of cement reach (17%) (8% of metakaolin and 9% Micro
Silica) while the optimum percentage of mosaic tiles and steel slag is (100%) and
(20%) respectively. The optimum percentages obtained are combining to produce
three basic green mixes: 1) 17% (8% of Metakaolin and 9% of Micro Silica) only,
(2) A mix containing 17% of (Metakaolin and of Micro Silica) plus 100% of
recycled mosaic, (3) 17% of (Metakaolin and Micro Silica), 100% of recycled
mosaic and 20% of slag. Compressive strength at (7, 28, and 60) days, modulus of
rupture at (28) days, absorption, fresh and hardened density are investigated. The
best improvement in compressive strength compared with reference concrete was
recorded (20.06, 10.855 and 9.983) % at (7, 28 and 60) days respectively for the
mix containing (17% of cementitious materials plus 100% of recycled mosaic)
while the ultimate flexure strength (24) % appeared in green mix containing (17%
of cementitious materials, 100% of recycled mosaic and 20% of slag). Generally,
an inverse relationship between density and absorption in all trail mixes which are
conducted