CONCRETE: TYPES OF FINISHES IN CONCRETE | DETAILED | LCETED

 

VARIOUS TYPES OF FINISHES IN CONCRETE

Various construction requirements particularly for the surface finish are decided based on the functional requirement / The aesthetical requirement in structure.

VARIOUS TYPES OF FINISHES IN CONCRETE:

Type of Finishes in concrete:

1) FORMED SURFACES

Finish F1: - Shall apply to all formed surfaces for which finish F2, F3 or any other special finish is not specified. Finish F1: - Shall include filling all form tie holes.

Finish F2: - Shall apply to all formed surfaces so shown in the drawings or specified by the Engineer. Finish F2- shall include filling all form tie  holes repair of gradual irregularities exceeding 6 mm, removal of ridges  and fins and abrupt irregularities by grinding.

Finish F3- shall apply to all formed surfaces exposed to view or where shown on the drawings or specified by the Engineer. Finish F3- shall include all measures specified for finish F2 and in addition, filling air holes with mortar and treatment of the entire surface with sack rubbed finish. It shall also include clean up of loose and adhering debris, where a sack rubbed finish is specified, the surfaces shall be prepared within two days after removal of the forms. The surfaces shall be wetted and allowed to dry slightly before mortar is applied by sack rubbing. The mortar used shall consist of one part cement to one and one-half parts by volume of fine (IS No 16 mesh) sand. Only sufficient mixing water to give the mortar a workable consistency shall be used. The mortar shall then be rubbed over the surface with a fine burlap or linen cloth so as to fill all the surface voids. The mortar in the voids shall be allowed to stiffen and solidify after which the whole surface shall be wiped clean with burlap so that the entire surface presents a uniform appearance without air holes and irregularities.

Curing of the surface shall continue for a period of ten days.

2) UNFORMED SURFACES

Finish U1

Finish U1 requires the surface in the specified slope /grade and the gradual surface irregularities not exceeding 6 mm when measured with respect to a plane surface parallel to slope with a template 300 mm long.

Screeding the surface of the concrete to the required slopes and grade as specified on drawings. Surfaces to be covered with concrete topping, terrazzo and similar surfaces shall be smooth screeded and levelled to produce even surface, irregularities not exceeding 6 mm.

Finish U2

Requirements shall be the same as for the U1 finish except for the abrupt irregularities shall be repaired slope and grade. The surface shall have a wooden finish.

Finish U3

The requirement shall be the same as for U2 finish except that the  surface shall have a steel trowel finish and the edges of the concrete shall  have the finish with edging tools.

Repair of gradual irregularities exceeding 6 mm, finishing joints  and edges of concrete with edging tools.

ALSO READ: Site Engineer: Post-concrete Inspection | LCETED 

SURFACE PREPARATION FOR CONCRETE

Site engineers must ensure the following points for surface preparation while proposing concreting against rock surface or existing concrete surface.

(A)      Rock Surface

1)  Inspection of rock surface for soundness.

2)  Cleaning of the surface to receive concrete.

(B)       Concrete Surface

1)  Surface preparation:

·       By Green Cutting

·       By Chipping

·       Cleaning of the surface

2)  Wetting of the surface prior to concreting.

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