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DIVISION 3 - CONCRETE

SECTION 03500 - CONCRETE FINISHING AND CURING

PART 1 - GENERAL

1.01 DESCRIPTION

This Section covers providing concrete finishing and curing acceptable to CompanyRepresentative.

1.02 REFERENCE CODES AND STANDARDS: Comply with applicable SAUDI ARAMCOStandards, and Codes and Standards as specified herein.

PART 2 - PRODUCTS

2.01 MATERIALS

A. Water: Per Specification Section-03300, Cast In Place Concrete, Paragraph

2.01, C. Water.

B. Sand: Clean and moist, confirming to requirements of SAUDI ARAMCOStandards SAES-Q-001 and 09-AMSS-088.

C. Fabric: Burlap or similar moisture retaining fabric.

D. Curing Paper: ASTM C171, nonstaining waterproof paper.

E. Tape: Pressure sensitive and waterproof.

F. Sealing-Dustproofing Compound: Hempel Hempadur Concrete Sealer #0599(transparent color) or approved equal.

PART 3 - EXECUTION

3.01 PROTECTION

Maintain concrete with minimum moisture loss and at a relatively constant temperaturefor the period necessary for hydration of the cement and hardening of the concrete.Protect finished concrete from damage by mechanical disturbances, improper curingprocedures and by rain or running water.

3.02 FINISHING CONCRETE

A. Formed Surfaces:

1. Ordinary Finish:

a. General: All formed surfaces shall have an ordinary finish unlessspecified or noted otherwise.

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CONSTRUCTION SPECIFICATIONS

SABG GIRLS ELEMENTARY SCHOOL AND

BOYS INTERMEDIATE SCHOOL

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b. Finish: Immediately following removal of forms, remove fins andirregular projections from all surfaces. Thoroughly clean andsaturate with water all form tie cavities, honeycombs, brokenedges and other defects. After saturating for not less than threehours, carefully point and trowel defects with a mortar of cement

and fine aggregate mixed in proportions used in the concrete beingfinished. Do not use mortar more than one hour old.

2. Smooth Finish:

a. General: Give all formed surfaces which will be exposed to view,except the underside of elevated slabs, a smooth finish in additionto the ordinary finish. Commence smooth finish operationimmediately after pointing mortar has thoroughly set.

b. Initial Operation: Commence operation by saturating surface withwater for not less than three hours. After saturating, rub surface

with a medium coarse carborundum stone and a small amount ofmortar composed of cement and fine aggregate. Mix mortarmaterials in proportions used in the concrete being finished.Continue rubbing until all form marks, projections and irregularitieshave been removed, all voids filled, and a uniform surfaceobtained. Leave paste produced by this rubbing in place at thistime.

c. Final Operation: After all concrete has been placed above surfacebeing finished, rub surface with a fine carborundum stone andwater until a smooth texture and uniform color is obtained. Afterfinal stone rubbing, rub surface vigorously with clean burlap toremove loose powder leaving the surface clean and free of allobjectionable marks.

3. Related Unformed Surfaces: Strike flush and float tops of walls,buttresses, horizontal offsets, and similar unformed surfaces to obtain atexture consistent with that of the adjacent finish, continue final finishingoperation across the tops of related unformed surfaces.

B. Floor Finishes:

1. General: Floor and slab finishing (including control joints and expansionjoints) shall comply with ACI-302-1R. Do not begin finishing operationsuntil concrete has been placed, consolidated, struck-off and leveled.

Commence work after surface water has disappeared and concrete hasset sufficiently to bear the weight of workmen and equipment. Allowsurface water to evaporate naturally. Do not dust surface with dry cementor sand.

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2. Finishes:

a. Floated Finish: Float surface with a power-driven float machine toproduce a finish true to elevations and slopes with a uniform

granular texture. Use hand wood floats in areas inaccessible topower-driven floats. Level surface to within 3 mm in 3 meters in alldirections.

b. Scratched Finish: After floating surface as specified in "FloatedFinish", lightly scratch surface with a stiff brush.

c. Steel Troweled (Smooth) Finish: After floating surface as specifiedin "Floated Finish", trowel first with power-driven trowels and finallywith steel hand trowels. Perform power trowelling operation in amanner to produce a finish smooth and completely free of defects.

After power trowelling, hand steel trowel surface to remove alldefects leaving surface dense and uniform in texture and

appearance. Continue hand trowelling until a ringing sound isproduced as the trowel is moved over the surface.

d. Broomed Finish: After floating surface as specified in "FloatedFinish", trowel once and draw a flexible bristle broom across thesurface to produce a non-slip texture. Broom in a directiontransverse to that of traffic or at a right angle to the slope of thesurface.

3. Selection of Finishes:

a. Floated Finish: Use for surfaces scheduled to receive roofing,

waterproofing membranes and recessed slabs for quarry orceramic tile.

b. Scratched Finish: Use for surfaces scheduled to receive bondedcementitious applications except those scheduled to receive heavyduty concrete toppings.

c. Troweled (Smooth) Finish: Use for exposed interior walkingsurfaces and surfaces scheduled to receive resilient floorcoverings or any other floor finishes.

d. Broomed Finish: Use for exposed exterior walking surfaces.

3.03 CURING

A. Curing and protection of fresh concrete shall start immediately after final finishingoperation. Curing methods and materials shall be in accordance with ACI-308and SAUDI ARAMCO Engineering Standard, SAES-Q-001. Hot weather curingshall comply with ACI-305 R. Concrete shall be protected from premature drying,

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temperature extremes and mechanical injury, for a period of at least 7 days toallow proper hydration of the Portland Cement and hardening of the concrete.

1. Moisture loss from formed surfaces shall be minimized by keeping theforms wet until they can be safely removed. Concrete shall be kept moistfor a minimum of 7 days or until 70% of the specified strength has been

achieved, whichever is longer.

2. All materials and facilities for curing concrete shall be on Site and readyfor use prior to concrete is placed.

B. Approved methods of curing include ponding or continuous mist spraying withsweet water or raw water (that meets specifications), or continuously wet mats.

3.04 SEALING AND DUSTPROOFING

On all exposed concrete floor surfaces, apply a uniform coat of liquid sealing/dustproofing compound in accordance with manufacturer's recommendations. Thisapplication is not intended to serve the purpose of a curing compound. Use the same

product manufacturer for sealing/dustproofing as was used for curing. Apply over cleandry surfaces. Commence application immediately after removing curing fabrics orpapers or liquid curing compound has thoroughly dried. Hempel Hempadur concretesealer #0599, two coats, transparent color, or approved equal.

END OF SECTION

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