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Unformatted text preview: egularities and 1 cm ( or 4 in ) for graclual irregularities.
Finish F3 -Immediately
after removal of forms from surfaces
designated for F3 finishes, all required patching, clean up and correction of major imperfections shall bc completed and the surfaces
shall be given a sack-rubbed mortar finish in the following manner:
The surfaces shall be thoroughly wetted and permitted to approach surface dryness before starting the sack rubbing.
surfaces shall be finished in areas sufficiently small to prevent complete drying of any part before the sack rubbing is completed for
that area: The mortar usecl for the sack rubbing shall consist
of one pa@ of cement to two parts, by volume, of sand passing
through IS Sieve 100, and enough water so that the consistency
27 IS . rw - 1957
of the mortar is that of thick cream.
The mortar shall be rubbed
over the area with clean burlap
or a spon_ge rubbed
filling all pits and irregularities.
mix in the 1~01~sis still plastic, a mixture Of the dry ingr~die~~ts of
in the same proportions shaJ1 he rubbed Over the area.
After the mortar ha5 stiffened adequately
to prevent smearing,
but bcforc it llas hartlcned, the exctkss mortar shall he rrrr,Ovcd by
rubbing with clean burlap.
After the final sack rubbing, a ligiir
fog spraying shall hc applied to the contctl surface, the moisture
th,us applictl being just sufficient to damp the surface without allowing water to run down the face cl tllc bvalls.
arcas shall be kept continuously
at least 72 hours after the final sack rubbing, or until completion
of the curing period for the concrctc.
as describcd under 4.16.1, abrupt irrcgularitics
shall not exceed 0.5 cm ( or
‘4 in ) for irrcgularitics
parallel to thr direction of flow, and 0.25 cm
( or 4 in ) far irregularities
in other direction.
shall not cxccctl 0.5 cm ( or i in ). Irregularities
limitc< shall hc rcducctl by grinding on a bevc~l of 1 to 20 ratio of
hcigll t to lcq$h.
d) Fiaisll FS - Finish F4 shall apply to formed surfaces where allsorptivc form lining is used.
Surfaces provided by absorptive form
lining shall not I>(, ruhbcd or trcatcd in any way except for cleaning
by wire IKllshing ant1 grinding off thin fins or small projections. 4.16.3 lJ~$~nzcrl Sur~~tces -The
C~CLWSof finish! for unformed
arc tlcsign;~trtl by the symbols Ul, U2 and U3. Interior
Sursnrfaccs shall IX, Jop~d for drainage where shown On the drawings.
faces \vhiclI \voultl IIC exposed to the weather and, which would normally
Unless the use of otllcr slopes or
be levcbl, sil;dl IX sloped for drainage.
level surfaces is spccitied, narrow surfaces, such as tops of walls and curbs,
shall bc sloped approxim;ltely
3 cm per metrc ( or $ in per ft ) of width
border surfaccbs, such as walks, roadways,
and tlecks shall be
1.5 cm p&r metre ( Or ) in per ft ). The classes...
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This document was uploaded on 10/01/2013.
- Fall '13