Laserfiche WebLink
DIVISIOlOi 03 Section 3450 - Arrhit�tural Precast Concrete-Plant Cast <br /> C. Hot-Dip Galvanized Finish: For exterior steel items,steel in exterior walls,and items <br /> indicated for galvanizing,apply zanc caating by the hot-dip process,complying with ASTM <br /> A 123 or ASTM A 153 as applicaUle. <br /> I3. Galvauvzing Repair Paint:High-zinc-dust-content paint with dry film containixlg not less <br /> than 94 percent zinc dust by weight,and complying with DOD-P-21035A or SSPC-Paint 20. <br /> E. Welding�lectrodes:Coniply�rith AWS standaxds. <br /> R <br /> F. Accessories: Provide clips,hai�.gers,plastic shizns,and other accessories required to instal.l <br /> archit.ectural precast conerete units. <br /> 2.07 BTARING PADS <br /> A. Prrsvide bearing pads for architectural precast concrete units as fallows: <br /> 1. Elastomeric Fads: AA.SHTQ�M 251,plain,vulcanized, l0-0 percent polychloroprene <br /> (neoprene} elas#omer,inolded.to size or cut from a molcied sheet, 50 ta 7Q share A <br /> durameter,inii�:axnum tensile strength 2250 psi(15.5 MPa)per A5TMD 412. <br /> 2.08 GROiTT MATERIAL <br /> A. Nonmetallic, Nonshrink Grout: Premixed,nonmetallic,noncarrosive, nonstaining grout <br /> coz�taining selected silica sands,portland cement,shri�ilcage-campensating agenis,plasticizing <br /> end water-reduci.ng agen.ts, camplying with ASTM C 11Q7, of consistency suitable for <br /> applicaiion,and a.30-minute warking time. <br /> 2.09�C)NCRETE M[XES <br /> A. Prepare design mixes for each type af concrete required. <br /> S. Design mixes rnay be prepared by a qualified indep@ndent testing agency or by q�aalified <br /> architectural precast manufacturu�g plant personnel at architectixral precast fabricatars <br /> option. <br /> C. Limit water-soluble chlaride ions to the rnaximurn percentage by weight of cennent <br /> permitted by ACI 318(ACI 318M). <br /> D. Narma.l�Weight Conarete Pace and Back-up Mixes:Prapartion mixes by either labaratory <br /> trial.batch or field test data rnethods according ta AC7 211.1,using materials i�n be used on <br /> the Prajeet,tc�provade normal-weight concrete with th�e following properties: <br /> 1. Compressive Stre�,.gfih(28-Day):5000 psi(34.5 Mpa)minimum. <br /> 2. Maxi�nu.m Water-Cement Ratia at Point of Placemen�0,40. <br /> , E. Add air-entraining admixture at manufacturer's prescril�d rate to r.esult in normal-weight <br /> concrete at paint of placemeni having an air content camplyiilg with MNL-117 <br /> requ.irennents. <br /> P. Wat+�r Absorption: 12 to 14 percent by volume tested according ta MNti-117. <br /> G. Add air-entrai�iing admixtur.e at rnanufacturers pres�ribed rate to result in lightweight <br /> concrete at point af placem.ent havang an a'vr content cam.plying with MNL-�.17 <br /> aeqttirements. <br /> H. When included in d.eaign mixes,add other admixtu.res to concrete mixes according to <br /> rnanufacturer's directions. <br /> 0345U- 5 <br /> HENIV�FIN COUN['Y Orono Salt.Starage <br /> Murch 22,2(Hl2 Project No.:OU3]569 Contrnct Na.:U751 R.2 <br />