—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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If projections exceed these heights, ACI requires removal. This way, the mockup will show any color differences aci 301-10 dry and wet loads of concrete.
ACI requires contractors to remove surface projections exceeding 1 in. ACI required tie holes and surface defects aci 301-10 be repaired but failed to define surface defects. Because the surface tolerances are specified in ACIclasses of surface and acu corresponding tolerances did not change in the revised ACI specification.
ACI requires a aci 301-10 panel for SF Make tie hole and aci 301-10 repairs so the mockup truly represents the finish that will be produced during construction. Worn formwork panels should be included to represent the surface finish aci 301-10 the end of the project.
Surface finish required to match sample panel furnished to contractor. If so, be sure to read Section 5.
New Surface Finishes for As-Cast Formed Concrete
The older version, ACIspecified no form-facing material requirements for Rough-Form Finish but had specific requirements for a Smooth-Form Aci 301-10 that required the aci 301-10 material to produce a smooth, uniform texture on the concrete. ACI did not address bugholes or surface aci 301-10 voids that commonly occur on formed surfaces aci 301-10 nether does the revised ACI specification.
Therefore, mockups should represent the quality of the finish that will likely be achieved during the actual construction.
Specifiers should select a rubbed finish i. ACI also required facing materials to be set in an orderly and symmetrical arrangement and required the contractor to keep the number of seams to a practical minimum.
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. Rubbed aci 301-10 free of bugholes consist of either smooth-rubbed, grout-cleaned rubbed or cork-floated finishes. Produce specified architectural finish including special aci 301-10 and exposed aggregate finishes. Otherwise, you may end up making costly repairs. For this reason, concrete contractors should address unspecified as-cast finishes in the bid documents to avoid post-construction disputes.
Contractor must reproduce a mockup of the sample finish on an area at aaci square feet. Aci 301-10 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.
Consider using aci 301-10 different loads of freshly mixed concrete for aci 301-10 the acii. 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.
Therefore, bugholes and other surface aci 301-10 are acceptable for as-cast formed finishes unless voids exceed the specified allowable widths and depths.
Here is a review of those specifications. Allowable formwork fins, other surface projections, surface voids and tolerances are defined 3011-10 the new ACI specifications. However, bugholes have been indirectly addressed by specifying the size of surface voids that 30110 be repaired. In addition to showing the finish of the formed surface, mockups typically establish the minimum acceptance criteria aci 301-10 the as-built surface finishes.
New Surface Finishes for As-Cast Formed Concrete
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. Also, use several formwork panels so aci 301-10 mockup will have seams. When insufficient paste can be drawn from the concrete itself, use a cementitious aci 301-10 grout made from the same source as the concrete.
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.
Mix to the aci 301-10 of thick paint and scrub grout into voids and remove excessive grout.
ACI no longer specifies form-facing material requirements. Specifying and Expecting the Impossible. Abrupt irregularities such as form offsets are measured within 1 inch of the irregularity aci 301-10 perpendicular to the surface. Classes A-D correspond with exposure conditions or aesthetic requirements of formed surfaces. Cork-Floated – Remove ties, burrs and fins, wet surface and apply stiff grout aci 301-10 of equal parts of aci 301-10 cement and sand.
Essentially, the requirements for the other three formed surface finishes Matching Sample Finish, Rubbed Finishes and Architectural Finishes did not change in the revised speciation.
This requirement is similar to 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 acci view. This was a major shortcoming of the old specification and typically resulted in costly disputes or repairs for concrete contractors, especially when surface defects were not defined in the project documents. Here a worker is producing a grout-cleaned finish free of adi by rubbing a grout into the surface voids.
For a Smooth-Form Aci 301-10, ACI did sci allow form-facing materials with raised grain, torn surfaces, worn edges, dents or other defects that would impair the texture of the concrete surface. For gradual irregularities, aci 301-10 gap between the concrete surface aci 301-10 a 5-foot straight-edge is measured between the contact points.
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