CONCRETE ON THE BASIS OF
NON-CLINKER BINDERS.
MORTARS AND DRY PACK
MIXES
L. Dvorkin and O.Dvorkin
Along with concrete on the basis of Portland cement and high-alumina cement
there are used different concrete on the basis of other non-organic and organic
binders in construction industry.
Mortars are composite heterogeneous materials which differ from concrete only
by absence of coarse aggregate and poured as a rule on the basis with thin
layer.
10.1. Silicate concrete
Unlike ordinary concrete, silicate concrete is produced on the basis of limesand binders of autoclave curing. The same classification by structural
features and purposes as for ordinary concrete is appropriate for silicate
concrete.
Extension of silicate materials started from 1880 when V.Michaelis has
suggested silicate brick. Foundational idea of silicate materials obtaining is
lime-sand composites hardening as a result of hydrosilicate synthesis at
raised temperature and pressure of vapour.
187
Fine powder lime-sand binder that has as a rule high activity (25-35% of active
СаО+MgO) can be substituted by lime-slag or fly ash binder with lower activity by
content of active calcium and magnesium oxides (10-15%). At that lime content
reduces in the mix approximately in 2-3 times.
Silicate concrete strength varies within wide range: from 5-10 MPa for lightweight
concrete to 80-100 MPa for high-strength heavyweight concrete.
Dense silicate concrete strength at anhydrous lime application can be
determined approximately by formula:
S s.
g
6
,
1
R = 05
.
4
+
,
18 (10
.1)
с
+
100 C/ W −1
Where S
is specific surface of sand, m2/kg; C/W is cement-water ratio.
g.s.
When hydrated lime is used:
С
R = 16
l
−1 14
(10.2)