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C. Reinforcing Support Devices: <br /> 1. Manufacturer support devices of metal(wire bar),concrete,or recycled plastic devices conforming to CRSI <br /> Manual of Standard Practice. <br /> 2. Precast concrete bar supports shall have minimum compressive strength of 3500 psi. <br /> 3. Do not use wood,clay brick,and other devices that can expand due to moisture gain. <br /> 4. For concrete surfaces exposed to view where legs of wire bar supports contact forms,use CRSI Class 1 <br /> plastic-protected steel wire or CRSI Class 2 stainless steel bar supports. <br /> 5. When precast concrete bar supports are used over aggregate base,or over waterproof membranes and <br /> vapor retarders, properly embed tie wires to prevent penetration of substrate. <br /> 6. Properly size foot of bar supports or similar devices to prevent settlement on base material or prevent <br /> puncture on vapor barrier. <br /> 7. When supporting multiple layers of reinforcement,provide the proper size and spacing of bar supports or <br /> similar devices to prevent deformation of plastic and to retain rebar within position tolerances. <br /> D. Plate Dowels-Construction Joints: <br /> 1. Plate dowels shall consist of smooth steel plate bars,ASTM A36 steel. Plate dowels shall be one of the <br /> following: <br /> a. Speed Plate System by Sika,size 1/4"x 4"x 6"dowels. <br /> b. Diamond Dowel System,by PNA Construction Technologies,size 1/4"x 4.5"dowels. <br /> c. EZdowel(including Worm Board)by McTech,Inc.,size 6 x 1/4"x 3 1/2"x 1/4"dowels. <br /> 3.4 CONCRETE MATERIALS <br /> A. Cement:ASTM C150,Type I or II. Use only one brand throughout project. <br /> B. Fly Ash:ASTM C 618,Class C or F. Use only one type and source throughout project. <br /> C. Slag:ASTM C989,Grade 100 or 120.Use only one type and source throughout project. <br /> D. Aggregates: <br /> a. No coal or lignite in concrete that will not be covered by building materials or soil. <br /> b. Fine aggregate grading requirements as defined in section 6.1 of ASTM C 33 shall be strictly <br /> met without deviation unless approved by SER. <br /> 2. If manufactured sand is used, blend with minimum 25%natural sand unless otherwise approved by SER. <br /> 3. Coarse Aggregate Size: <br /> a. Nominal maximum coarse aggregate size shall be 1 inch for slabs—5 1/2 inch thick. <br /> b. The nominal maximum size of an aggregate is the smallest sieve size through which the major <br /> portion of the aggregate must pass,with a minimal amount retained on the maximum sieve size. <br /> Maximum <br /> 4%shall be retained on the nominal maximum size sieve. <br /> 4. Adjust proportions of combined coarse, intermediate, and fine aggregates to provide the following <br /> particle size distribution characteristics,unless otherwise approved: <br /> a. Coarseness Factor of 60 to 75%. <br /> 1) The Coarseness Factor(CF)is the percent of combined aggregate retained on the#8 sieve that <br /> is also retained on the 3/8"sieve. <br /> (a) The Coarseness Factor is calculated as follows:CF=Aggregate retained on 3/8"sieve <br /> /Aggregate retained on#8 sieve. <br /> 2) Adjusted Workability Factor <br /> (a) The Workability Factor(WF)is the percent of combined aggregate that passes the#8 <br /> sieve.(b) The Adjusted Workability Factor(Adj-WF)is calculated as follows: <br /> (1) Adj-WF=WF+[(Cementitious Material-564 <br /> lbs)/37.61(c) The range of accepted Adj-WF for a given CF is <br /> as follows: <br /> 2-26-18 <br /> 033000-3 <br />