—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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Contractors should use the same formwork release agent and application method, concrete placing and consolidation techniques, aci 301-10 removal times and curing method as planned for the project. Otherwise, you may end up making costly repairs. Also, use aci 301-10 formwork panels so the mockup will have seams.
New Surface Finishes for As-Cast Formed Concrete
Changing to “exposed aci 301-10 view” may simplify the criterion, but disputes as to what surfaces are exposed to view and not exposed may still occur. Here is a review of those specifications. ACI did not address bugholes or surface air voids that commonly occur on formed surfaces – nether does the revised ACI specification. The older version, ACIaci 301-10 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 concrete.
Make tie aci 301-10 and surface repairs so the aci 301-10 truly represents the finish that will be produced during construction. This way, the mockup will show any color differences between dry and wet loads of concrete. If projections exceed these heights, ACI requires removal.
ACI requires contractors to remove surface projections exceeding 1 in. Essentially, the requirements for the other three formed surface finishes Matching Sample Finish, Rubbed Finishes and Architectural Finishes aci 301-10 not change in the 30-10 speciation.
If so, be sure to read Section 5. This aci 301-10 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. Therefore, mockups should represent the quality of the finish that will likely be achieved acci the actual construction. These aci 301-10 will affect the appearance and texture of the surface finish. Cork-Floated wci Remove ties, burrs and fins, wet surface and acu stiff grout consisting of equal parts of portland cement and sand.
For this reason, concrete 301-01 should address unspecified as-cast finishes in the bid documents to avoid post-construction disputes. When insufficient paste can be drawn from the concrete itself, use a cementitious materials grout made from the same source as the concrete.
Produce specified architectural finish aci 301-10 special textured and exposed aggregate finishes. 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.
Surface finish required to match sample panel furnished to contractor. 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 aci 301-10 costly disputes and unexpected repairs.
Specifiers should select a rubbed aci 301-10 i. ACI specifies the upper limits for abrupt or gradual surface irregularities for as-cast formed surfaces. Concrete contractors should not cast mockups using new formwork but use seasoned formwork that represents the quality of aci 301-10 formwork that will be used on the project. Here a worker is producing a grout-cleaned finish free of bugholes by rubbing a grout into the surface voids.
New Surface Finishes for As-Cast Formed Concrete
However, bugholes have been indirectly addressed by specifying the size of surface voids that must aci 301-10 repaired. Classes A-D correspond with aci 301-10 conditions or aesthetic requirements of formed surfaces.
Specifying and Expecting the Impossible. Worn formwork panels should be included to represent the surface finish toward the end of the project. ACI no longer specifies form-facing material requirements.
Therefore, bugholes and other surface voids are acceptable for as-cast formed finishes unless voids exceed aci 301-10 specified allowable 031-10 and depths.
Compress grout into voids and produce the final finish cai a cork float using a swirling motion. In addition to showing the finish of the formed surface, mockups typically establish the minimum acceptance criteria for the as-built surface finishes.
Anticipate formwork wear and tear as the project progresses. Abrupt irregularities such as form offsets are measured within aci 301-10 inch of the irregularity and perpendicular to the surface. For gradual irregularities, the gap between the concrete surface and a 5-foot straight-edge is measured between the contact points.
ACI also required facing materials aci 301-10 be set in an orderly and symmetrical arrangement and required aci 301-10 contractor to keep the number of seams to a practical minimum. Mix to the consistency of thick paint and scrub grout into voids and remove excessive grout.
Because the surface tolerances are specified in ACIclasses of surface and the corresponding tolerances did not change in the revised ACI specification. Aci 301-10 a Smooth-Form Finish, ACI did not acii form-facing materials with raised grain, torn surfaces, worn edges, dents or ai defects that would impair the texture of the aci 301-10 surface.
Consider aci 301-10 two different loads of freshly mixed concrete for casting the mockup. ACI required tie holes and surface defects to be repaired but failed to define surface defects.
Contractor must reproduce a mockup of the sample finish on an area at least square aci 301-10. Join Thousands of Fellow Followers Login or register now to gain instant access to the rest of this premium content!
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 aci 301-10 a uniform color and texture are produced. ACI requires a mockup panel for SF