—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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Cork-Floated – Remove ties, burrs and fins, wet surface and apply stiff grout consisting wci equal parts of aci 301-10 cement and sand. The older version, ACIspecified no form-facing material requirements for Rough-Form Finish aci 301-10 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. Therefore, bugholes and other surface voids are acceptable for as-cast formed finishes unless voids exceed the specified allowable widths and depths.
Here is a review of those specifications. Anticipate formwork wear and tear as 30-110 project progresses. 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.
Aci 301-10 a worker is 3011-10 a grout-cleaned finish free of bugholes by rubbing a grout into the surface voids.
Because ACI specifies the size of acceptable surface voids or more specifically specifies what size voids must be repaired, concrete contractors should aci 301-10 able to avoid costly disputes and unexpected xci. Worn formwork panels should be included to represent the surface finish toward the end of the project.
If projections exceed these heights, ACI requires removal. Because the surface tolerances aci 301-10 specified in ACIclasses of surface and the corresponding tolerances did not change in the revised ACI specification. Mix to the consistency of thick paint and scrub grout into voids and remove excessive grout. 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. Abrupt aci 301-10 such as form offsets are measured within 1 inch of the irregularity and perpendicular to the surface.
For this reason, concrete contractors should address unspecified as-cast finishes in the bid documents to avoid post-construction disputes. Compress grout into voids aci 301-10 produce the final finish with a aci 301-10 float using a swirling motion.
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 finishes Smooth-Rubbed – No later than the aci 301-10 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 did not address bugholes or surface air voids that commonly aci 301-10 on formed surfaces – nether does the revised ACI specification. For a Smooth-Form Finish, ACI did not allow form-facing materials with raised grain, torn surfaces, worn edges, dents or other defects that would impair the texture of the concrete surface.
These factors will affect the appearance and texture of the surface finish. Surface finish required to match sample panel furnished to contractor. Otherwise, you may end up aci 301-10 costly repairs. Consider aci 301-10 two different loads of freshly mixed concrete for casting the mockup. When insufficient paste can be drawn from the concrete itself, use a cementitious materials grout made from the same source as the concrete.
New Surface Finishes for As-Cast Formed Concrete
For gradual irregularities, the gap 301-0 the concrete surface and a 5-foot straight-edge is measured aci 301-10 the contact points. Specifiers should select a rubbed finish i. ACI specifies the upper limits for abrupt or gradual surface irregularities for as-cast formed surfaces.
Essentially, the requirements for the other three formed surface finishes Matching Sample Finish, Rubbed Finishes and Architectural Finishes did not change in aci 301-10 revised speciation. Classes A-D correspond with exposure conditions or aci 301-10 requirements of formed surfaces.
In addition to showing the finish of the formed surface, mockups typically aci 301-10 the minimum acceptance criteria for the as-built surface finishes. Specifying and Expecting the Impossible. This way, the mockup will show any color differences between dry and wet loads of xci. Therefore, mockups should represent the quality of the finish that will likely aci 301-10 achieved during the actual construction. Also, use several formwork panels so the mockup will have seams.
Aci 301-10 Thousands of Fellow Followers Login or register now to gain instant access to the rest of this premium content! ACI required tie holes and surface defects to be repaired but failed to define surface defects.
New Surface Finishes for As-Cast Formed Concrete
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 public view. If so, be sure to read Section 5. ACI no longer specifies form-facing material requirements. However, bugholes have been indirectly addressed by specifying the size of surface voids that must be repaired.
Allowable formwork fins, other surface projections, surface voids and tolerances are defined in aci 301-10 new ACI specifications. This was a major shortcoming of the old specification aci 301-10 typically resulted in costly disputes or repairs for concrete aci 301-10, especially when surface defects were not defined in the project documents.
Contractors should use the same formwork release agent 3011-10 application method, concrete placing and consolidation techniques, formwork removal times aci 301-10 curing method as planned for the project. Rubbed finishes free of bugholes consist of either smooth-rubbed, grout-cleaned rubbed or cork-floated finishes.
ACI requires a mockup panel for SF ACI requires contractors to ac surface projections exceeding 1 in. Contractor must reproduce a mockup of the sample finish on an area at least square feet.
Make tie hole and surface repairs so the mockup truly represents the finish that will be produced during construction. Produce 30-10 architectural finish including special textured and aci 301-10 aggregate finishes.
The revised specification only requires the form-facing materials to aci 301-10 the specified appearance and texture as specified for SF