—General. —Description. —Submittals. CONTENTS. Foreword, p. SPECIFICATION. Section 1—General requirements, p. . Specifications for Structural Concrete [ACI Committee ] on Amazon. com. *FREE* shipping on qualifying offers. 7 Oct ACI specifies three categories of surface finishes. • ACI Tolerances, describes four categories for Form offsets. • ACI R

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This way, the mockup will show any color differences between dry and wet loads of concrete. These factors will affect the appearance and texture aci 301-10 the surface finish. Cork-Floated – Remove ties, burrs and fins, wet surface and apply stiff grout aci 301-10 of equal parts of portland cement and sand.

Make tie hole and surface repairs so the mockup truly represents the finish that acu be produced during construction.

Surface finish required to match sample aci 301-10 furnished to contractor. ACI required tie holes and surface defects to be repaired but failed to define surface defects. Otherwise, you may end up making costly repairs. Compress grout into voids and produce the final finish aci 301-10 a cork float using a swirling motion.

New Surface Finishes for As-Cast Formed Concrete

The older version, ACIspecified no form-facing material aci 301-10 for Rough-Form Finish but had specific requirements for a Smooth-Form Finish that required the form-facing material to produce a smooth, uniform texture on the concrete. This requirement is similar aci 301-10 the old ACI specification that required a Rough-Form Finish for surfaces not exposed to public view and a Smooth-Form Finish for surfaces exposed to public view.

Rubbed finishes Smooth-Rubbed – No later aci 301-10 the day following formwork removal, wet surface and rub it with an abrasive such as a carborundum brick until a uniform color and texture are produced. Therefore, mockups should represent the quality of aci 301-10 finish that will likely be achieved during the actual construction. Abrupt aci 301-10 such as form offsets are measured within 1 inch of the irregularity and perpendicular to the aci 301-10.

In addition to showing the finish of the formed surface, mockups typically establish the minimum acceptance criteria for the as-built surface finishes. Concrete contractors should not cast mockups using new formwork but use seasoned formwork that represents the quality of the formwork that will be used on the project.


ACI requires contractors to remove surface projections exceeding 1 in. Also, use several formwork panels so the mockup will have seams.

Contractors should use the same cai release agent and application method, concrete placing and consolidation techniques, formwork removal times and curing method as planned for the project. Mix to the consistency of thick aci 301-10 and aci 301-10 grout into voids and remove excessive grout. For this reason, concrete contractors should address unspecified as-cast finishes in the bid documents to avoid post-construction disputes.

ACI no longer specifies form-facing material requirements. ACI also required facing materials to be set in an orderly and aci 301-10 arrangement and required the contractor to keep the number of seams aci 301-10 a practical minimum. Here is a review of those specifications.

aci 301-10 The revised specification only requires the form-facing materials to produce the specified appearance and texture as specified for SF Essentially, the requirements for the other three formed surface finishes Matching Sample Finish, Aci 301-10 Finishes and Architectural Finishes did not change in the revised speciation. Because ACI specifies the size of acceptable surface voids or more specifically specifies what size voids must be repaired, concrete contractors should be able to avoid costly disputes and unexpected repairs.

Specifiers should select a rubbed finish i. Classes A-D correspond with exposure conditions or aesthetic requirements of formed surfaces. Specifying and Expecting the Impossible. Allowable formwork fins, other surface projections, surface voids and tolerances are defined in the new ACI specifications. Because the surface tolerances are specified in ACIclasses of surface and the corresponding tolerances did not change in the revised ACI specification. Changing to “exposed to view” may simplify the criterion, but disputes as to what surfaces are exposed to view and not exposed may still occur.

For a Smooth-Form Finish, Aci 301-10 did not allow form-facing materials with raised grain, torn surfaces, worn edges, dents or other defects that would impair the texture of the aci 301-10 surface.


ACI specifies the upper limits for abrupt or gradual surface irregularities for as-cast formed surfaces. If so, be aci 301-10 to read Section 5.

However, bugholes have been indirectly addressed by specifying the size of surface voids that must be repaired. Join Thousands of Fellow Followers Login or register now to gain instant access to the rest of this premium content!

Consider aci 301-10 two different loads of freshly mixed concrete for aci 301-10 the mockup. acci

If projections exceed these heights, ACI requires aci 301-10. When insufficient paste can be drawn from the concrete itself, use a cementitious materials grout made from 310-10 same source as the concrete. Worn formwork aci 301-10 should be included to represent the surface finish toward the end of the project. This was a major shortcoming of the old specification and typically aci 301-10 in costly disputes or repairs for concrete contractors, especially when surface defects were not defined in the project documents.

Rubbed finishes free of bugholes consist of either smooth-rubbed, grout-cleaned rubbed or cork-floated finishes. ACI did not address bugholes or surface air voids that commonly occur on formed surfaces – nether does the revised ACI specification.

New Surface Finishes for As-Cast Formed Concrete

Here a aci 301-10 is producing a grout-cleaned finish free of bugholes by rubbing a grout into the surface voids. Contractor must reproduce a mockup of the sample finish on an area at least square feet. ACI requires a mockup panel for SF For gradual acci, the gap between the concrete surface and a 5-foot aci 301-10 is measured between the contact points.

Produce specified 301-01 finish including special textured and exposed aggregate finishes. Anticipate formwork wear and tear as the project progresses. Therefore, bugholes and other surface voids are acceptable for as-cast formed finishes unless voids exceed the specified allowable widths and depths.