—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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Produce specified architectural aci 301-10 including aaci textured and exposed aggregate finishes. Therefore, mockups should represent the quality of the finish that will likely be achieved during the actual construction. Contractor must reproduce a mockup of the sample finish on an area at least square feet.
When insufficient paste can be drawn from the concrete itself, use a cementitious materials grout made aci 301-10 the same source as the concrete. Surface finish required to match sample panel furnished to contractor.
New Surface Finishes for As-Cast Formed Concrete
Compress grout into voids and produce the final finish with a cork float using a swirling aci 301-10. This way, the mockup will show any color differences between dry and wet loads of concrete. For this reason, concrete contractors should address unspecified as-cast finishes in the bid documents to avoid post-construction disputes.
Specifying aci 301-10 Expecting the Impossible.
Anticipate formwork wear and tear as the project progresses. This was a major aci 301-10 of the old specification and typically resulted in costly disputes or repairs for concrete contractors, especially when surface acj were not defined in the project documents. Cork-Floated – Remove ties, burrs and fins, wet surface aci 301-10 apply stiff grout consisting of equal parts of portland cement and sand.
Because the surface tolerances are specified in ACIclasses of surface and the corresponding tolerances aci 301-10 not change in the revised ACI specification. ACI requires contractors to remove surface projections exceeding 1 in. The revised specification only requires the form-facing materials to produce aci 301-10 specified appearance and texture as aci 301-10 for SF Here is a review of those specifications.
In addition to showing the finish of the formed surface, mockups typically establish the minimum acceptance criteria for the as-built surface finishes. ACI required tie holes and surface defects to be repaired but failed to define surface defects. Worn formwork panels should be included to represent the surface finish 031-10 the end of the project. For a Smooth-Form Finish, ACI did not allow form-facing materials with raised grain, torn surfaces, worn edges, dents or other defects aci 301-10 would impair the texture aci 301-10 the concrete surface.
Rubbed finishes Smooth-Rubbed – No later than 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.
ACI aci 301-10 required facing materials to be set in an orderly and symmetrical arrangement and required the contractor to keep aci 301-10 number of seams to a practical minimum.
New Surface Finishes for As-Cast Formed Concrete
If projections exceed these heights, ACI requires removal. Otherwise, you may end up making costly repairs.
Essentially, the requirements for the other three formed surface aci 301-10 Matching Sample Finish, Rubbed Finishes and Architectural Finishes did not 301-0 in 031-10 revised speciation.
Abrupt irregularities such as form offsets are measured within 1 inch of the irregularity and perpendicular to the surface. Allowable formwork fins, other surface projections, surface voids and tolerances are defined in the new ACI specifications.
The older version, ACIspecified no form-facing material requirements 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 aci 301-10.
ACI specifies the upper limits for abrupt or gradual surface irregularities for as-cast formed surfaces. ACI aci 301-10 longer specifies form-facing material requirements. Also, use several formwork panels so the mockup will have seams. These factors will affect the appearance and texture of the surface aci 301-10. Rubbed finishes free of bugholes cai of either smooth-rubbed, grout-cleaned aci 301-10 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. For gradual irregularities, the gap between the concrete surface and a aci 301-10 straight-edge is measured between the contact points.
This requirement is similar to the old ACI specification that required a Rough-Form Finish for surfaces not exposed to public aci 301-10 and a Smooth-Form Finish for surfaces exposed to public view. ACI requires a mockup panel for SF However, bugholes have been indirectly addressed by specifying the size of surface aci 301-10 that must be repaired.
Therefore, bugholes and other surface voids are acceptable for as-cast formed finishes unless voids exceed the aci 301-10 allowable widths and aci 301-10. 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. Classes A-D correspond aci 301-10 acl conditions or aesthetic requirements of formed surfaces.
Changing to “exposed to aci 301-10 may simplify the criterion, but disputes as to what surfaces are exposed to view and not exposed may still occur. Contractors should use the same formwork release agent and application method, concrete placing and consolidation techniques, formwork removal times and curing method as planned for the project.
If so, be sure to read Section 5. Aci 301-10 to the consistency of thick paint and scrub grout into voids and remove excessive grout. Specifiers should select a rubbed finish i. Aci 301-10 Thousands of Fellow Followers Login aci 301-10 register now to gain instant access to the rest of this premium content!
Acii 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. Consider using two different loads of freshly mixed concrete for casting the mockup. Make tie hole and surface repairs aci 301-10 the mockup truly represents the finish that will be produced during construction.
Here a worker is producing a grout-cleaned finish free of bugholes by rubbing a grout into the surface voids.