Item 410 Concrete Structures文档格式.docx

1、Appropriate mix designs for class of concrete for each type of structure or unit;Appropriate mortar and grout mix designs;Product name, description, technical information and supplier of any acrylic-polymer latex admixture;Type, supplier and certified test results for expansion joint materials;Type

2、of waterstop and confirmation that the product conforms to TxDoT DMS-6160;Type and manufacturer of proposed evaporation retardant and confirmation that it meets the requirements of test results for TxDoT DMS-4650;Type and manufacturer of proposed chemical admixtures and confirmation that it meets th

3、e requirements of test results for TxDoT DMS-4640;Type and manufacturer of proposed curing admixtures and confirmation that it meets the requirements of test results for TxDoT DMS-4640;Type and manufacturer of proposed epoxy and/or adhesives and confirmation that it meets the requirements of test re

4、sults for TxDoT DMS-6100;Reinforcing steel shall conform to Standard Specification Item No. 406S, “Reinforcing Steel”.Contractors formwork plan for placing and consolidating concrete around wall penetrations and at locations designated as having congested reinforcing steel.410S.3 MaterialsA. Concret

5、e Concrete shall conform to Item No. 403S, Concrete for Structures.The class of concrete for each type of structure or unit shall be as indicated on the drawings or by pertinent governing specifications.B. Grout or MortarWhen required or shown on the drawings, mortar and grout consisting of 1 part h

6、ydraulic cement and 2 parts sand with sufficient water to provide the desired consistency shall be provided. Mortar shall be provided with a consistency that can be handled easily and spread by a trowel. Grout shall be provided with a consistency that will flow into and completely fill all voids.C.

7、LatexWhen required an acrylic-polymer latex admixture （acrylic resin emulsion in accordance with TxDoT DMS-4640, “Chemical Admixtures for Concrete”） suitable for producing polymer-modified concrete or mortar shall be provided. The latex shall not be allowed to freeze.The following information shall

8、be submitted for latex:Name and information of company contact personnel,Product name and polymer description, andThe latex shall meet the following requirements.Table 1: LATEX ADDITIVE REQUIREMENTSPropertyValueTotal Solids, minimum, percent47PH9.0 to 11.0Brookfield viscosity （# 1 spindle 10 rpm）, m

9、Pas, maximum60Butadiene Content, percent30 to 40Freeze-thaw stability, 2 cycles. maximum0.1Specification targets and production tolerances shall also be provided for the following properties.1. viscosity （including test method and temperature reference）,2. percent solids,3. pH,4. specific gravity, a

10、nd5. styrene/butadiene ratio.D. Reinforcing SteelE. Expansion Joint MaterialThe expansion joint material shall conform to the requirements of TxDoT DMS-6310, “Joint Materials and Fillers”.1. Preformed Fiber SheetsUnless otherwise indicated on the drawings preformed bituminous fiber material shall be

11、 provided. The preformed fiber material shall conform to the dimensions indicated on the drawings. Preformed fiber sheets shall meet the requirements of ASTM D-1751, “Preformed Expansion Joint Filler for Concrete Paving and Structural Construction （Nonextruding and Resilient Bituminous Types）. The r

12、equirements related to bitumen content, density and water absorption shall not apply to nonbituminous materials. 2. Joint Sealing MaterialUnless otherwise indicated on the drawings a Class 4, 5 or 7 low-modulus silicone sealant shall be provided that conforms to the requirements of TxDoT DMS-6310, “

13、Joint Sealants and Fillers”.3. Timber BoardsTimber boards shall be made from redwood or cypress and must be free from sapwood, knots, clustered birds eye, checks and splits. When oven dried at 230oF （110oC） to a constant weight （mass）, the density of the board shall be between 20 and 35 lbs. Per cub

14、ic foot （between 320 and 560 kgs per cubic meter）4. Asphalt BoardAsphalt Board shall conform to the dimensions indicated on the drawings and shall meet the description, general requirements and distortion testing of ASTM D-994, “Preformed Expansion Joint Filler for Concrete （bituminous Type）”. 5. Re

15、bonded Neoprene Filler SheetRebonded neoprene filler shall consist of ground closed cell neoprene particles, rebonded and molded into sheets of uniform thickness of the dimensions indicated on the drawings. These sheets shall meet the requirements of ASTM D-1752, Type I.The manufacturer shall furnis

16、h the Engineer or designated representative with certified test results as to the compliance with the above requirements.F. Waterstop Unless otherwise indicated on the drawings, rubber waterstops or Polyvinyl Chloride （PVC） waterstops that conform to TxDoT DMS-6160, “Waterstops, Nylon Reinforced Neo

17、prene Sheet, and Elastomeric Pads” shall be provided.G. Evaporation RetardantsEvaporation retardants shall conform to the requirements of TxDoT DMS-4650, “Hydraulic Cement Concrete Curing Materials and Evaporation Retardants”. The evaporation retardant must be a commercially available monomolecular

18、film compound. The evaporation retardant shall have no adverse effect on the cement hydration process or the concrete and shall reduce surface moisture evaporation from the concrete when performing concrete operations in direct sun, wind, high temperatures, or low relative humidity. The producer of

19、the evaporation retardant shall certify that it meets these specified requirements.H. Curing Materials 1. Liquid Membrane Forming compounds Liquid Membrane Forming compounds shall conform to the requirements of TxDoT DMS-4650, “Hydraulic Cement Concrete Curing Materials and Evaporation Retardants”.

20、The compound shall be applied to damp concrete as a fine mist through atomizing nozzles at a wet film thickness of 8 to 9 mils （200 to 230 m）. The liquid membrane-forming compound must not react deleteriously with concrete or its components. It must produce a firm, continuous, uniform moisture-imper

21、meable film that is free of pinholes, cracks, or other film defects. It must also exhibit satisfactory adhesion.The consistency must be such that the compound can be applied satisfactorily by conventional or airless spray at atmospheric and material temperatures above 40oF （5oC） without thinning. Wh

22、en applied at the manufacturers recommended thickness, not less than 8 mils （200 m） wet, to vertical surfaces of damp concrete, the compound must not run off or appreciably sag. The liquid membrane-forming compound must not disintegrate, check, peel, or crack during the required curing period. It mu

23、st not peel or pick up under traffic, and must disappear from the surface of the cured concrete by gradual disintegration.2. Cotton Mats Cotton mats shall consist of a filling material of cotton “bat” or “bats” at least 12 oz. Per square yard （400 grams per square meter） completely covered with unsi

24、zed cloth at least 6 oz. Per square yard （200 grams per square meter） stitched longitudinally with continuous parallel rows of stitching spaced at less than 4 in. （100 mm）, or tuft both longitudinally and transversely at intervals less than 3 in. （75 mm）. The cotton mats shall be free from tears and

25、 in good general condition. A flap at least 6 in. （150 mm） wide with two （2） thicknesses of the covering that extends along one side of the mat shall be provided.3. Polyethylene SheetingThe polyethylene sheeting shall be at least 4 mils thick （0.1 mm） and free from visible defects. Clear or opaque w

26、hite sheeting shall be provided when the ambient temperature during curing exceeds 60oF （15oC） or when applicable to control temperature during mass pours.4. Burlap-Polyethylene Mats The burlap-polyethylene mats shall be made from burlap impregnated on 1 side with a film of opaque white-pigmented po

27、lyethylene, free from visible defects. The laminated mats shall have at least 1 layer of an impervious material such as polyethylene, vinyl plastic, or other acceptable material （either as a solid sheet or impregnated into another fabric） and shall be free of visible defects.I. Chemical AdmixturesCh

28、emical admixtures including water reducing, placticizers and air entrainment shall conform to TxDoT DMS-4640, “Chemical Admixtures for Concrete” Calcium chloride shall not be used. Admixtures shall be included in the prequalified concrete admixtures list maintained by TxDots Construction Division.J.

29、 City of Austin Survey Monuments The Public Works Department may furnish permanent survey monuments to be cast in concrete as indicated on the drawings or as directed by the Engineer or designated representative.K. Epoxy Unless indicated otherwise on the drawings, epoxy materials shall conform to TxDoT DMS-6100, “E