Laserfiche WebLink
Gateway Park Center PERKINS+WILL <br /> 810495.00 <br />12/06/18 <br />031000-13 Concrete Formwork <br />provided curing and protection operations are maintained after removal of <br />formwork. <br />B.Formwork supporting weight of concrete, such as beam soffits, joists, slabs, and <br />other structural elements, may not be removed until concrete has attained at <br />least 75% of design compressive strength as proven by cylinder test. If stripping <br />occurs before 3 days, 100% strength must be achieved. <br />1.Provide reshores as required per ACI 347. <br />2.Determine potential compressive strength of in-place concrete by testing <br />field-cured specimens representative of concrete location or members. <br />C.Remove formwork progressively using methods to prevent shock loads or <br />unbalanced loads from being imposed on structure. Comply with ACI 347. <br />D.Loosen forms carefully. Do not wedge pry bars, hammers, or tools against <br />concrete surfaces. <br />E.Reshore structural members where required due to design requirements, <br />construction requirements, or construction conditions. <br />1.Reshore on same day shoring and forms are removed. <br />F.Whenever formwork is removed during the curing period, the exposed concrete <br />shall be cured per requirements of Section 033000. <br />G.All wood formwork, including that used in void spaces, pockets and other similar <br />places shall be removed. <br />H.Form tie holes shall be filled as per approved samples submitted to the Design <br />Professionals. <br />I.The Contractor shall assume responsibility for all damage due to removal of the <br />forms. <br />3.4 RE-USING FORMS <br />A.Before forms can be re-used, surfaces that will be in contact with freshly poured <br />concrete must be thoroughly cleaned, damaged areas repaired, and projecting <br />nails withdrawn. <br />1.Split, frayed, delaminated or otherwise damaged form-facing material will <br />not be acceptable. <br />2.Apply new form release agent on re-used forms. <br />B.When forms are extended for successive concrete placement, thoroughly clean <br />surfaces, remove fins and laitance, and tighten forms to close joints. Align and <br />secure joints to avoid offsets.