§ 15.01.1070. Materials.

A.

Portland cement. Portland cement shall conform to the requirements of ASTM Specification C150, unless otherwise specified type II cement shall be used.

B.

Water. Water shall be clean and free from damaging amounts of oil, salt, acid, alkali, organic matter or other deleterious substances.

C.

Air-entraining admixtures. Air-entraining admixtures shall conform to ASTM designation C150 and C260, except that the relative durability factor in the freezing and thawing test shall be no less than ninety-five. Admixtures containing chloride ions shall not be used in prestressed concrete or in concrete containing aluminum or galvanized embedment.

D.

Use of calcium chloride. Calcium chloride may not be used unless written approval by the city engineer or public works director. No more than two percent of calcium chloride can be used, and no calcium chloride shall be used in reinforced slab structure.

E.

Fly ash or other pozzolans. Fly ash or other pozzolans may be used only upon approval by the city engineer. They shall conform to ASTM C618. In no case shall more than fifteen percent of the Portland cement be replaced by an equal weight of pozzolan.

F.

Curing compound. Curing compound shall meet the requirements for ASTM C309. The compound shall be applied in accordance with the manufacturers recommendations; and applied as soon as possible after final finishing. Transparent curing compounds shall meet the following requirements: the compound shall be a liquid that is free from suspended matter at the time of application. It shall be sufficiently low in viscosity to result in an even, uniform coating when applied by spraying. The compound shall be sufficiently transparent and free from permanent color to result in no pronounced change in color from that of the natural concrete at the conclusion of the curing period. The compound shall, however, contain a dye of color strength sufficient to render the film distinctly visible on the concrete for a period of at least four hours after application, and shall meet the requirements of ASTM C309 1-0 Class B. Red pigment shall be used that can be readily seen by the inspector.

G.

Preformed expansion joint filler. Preformed expansion joint filler shall conform to the requirements of ASTM D-1752 or ASTM D-994.

H.

Aggregates. Aggregates shall conform to tentative specifications for concrete aggregates, ASTM C-33. The aggregates shall be free from substances which are chemically active relative to hydrated cement.

1.

Coarse aggregate. A coarse aggregate shall consist of hard durable particles of a mixture of crushed and natural aggregate, and shall be subject to the following limitations:

a.

Deleterious substances shall not exceed:

		% by Wgt.
1.	Soft fragments	3.0
2.	Coal lumps	1.0
3.	Clay lumps	0.5
4.	Material passing #100 sieve	1.5
5.	Organic material	0.1
6.	Total for any or all of sieve	3.0

 

b.

Loss on abrasion by Los Angeles Abrasion Test not more than forty percent by weight.

c.

Loss on exposure to five cycles of sodium sulfate soundness test, not more than eight percent by weight.

The maximum size of aggregate to be used shall not exceed one and one-half inches in terms of the size definition contained in ASTM Standards, except that the maximum size shall not exceed: a) one-fifth the narrowest dimension between sides of forms, nor b) one-third the depth of the slabs, nor c) three-fourths the minimum clear spacing between individual reinforcing bars or wires, bundles of bars, or pre-stressing tendons or ducts. Coarse aggregate shall be well graded to produce as dense a mixture as practical.

2.

Fine aggregate.

a.

Fine aggregate shall consist of clean, hard, durable, particles of natural sands, subject to the following limitations:

		% by Wgt.
1.	Soft fragments	3.0
2.	Coal	1.0
3.	Material passing #200 sieve	3.0
4.	Micaceous or flaky particles	3.0
5.	Total for any or all of above	5.0

 

b.

Organic or colormetric test using sodium hydroxide shall result in a color not darker than Number 2 in the accepted range.

c.

Loss on exposure to five cycles of the sodium sulfate soundness test shall not exceed eight percent by weight.

Fine aggregate shall be well graded and meet ASTM C-33.

I.

Metal reinforcement and embedded item. Metal reinforcement shall conform to the requirements of ACI 318-77 Section 3.5 and shall be of the sizes and grade specified in the plans. Reinforcing steel shall be clean and free from rust, scale, paint, grease or other foreign matter which might impair the bond.

1.

Fabrication. Reinforcement bars shall be cut and bent in compliance with ACI standard code (ACI 318 later edition) Section 7.1. Bars shall not be bent, heated or straightened in a manner that will injure the material. Reinforcement with kinks, cracks, or improper bends will be rejected.

2.

Placement. Reinforcement shall be stable and secure by wiring or other approved means which will prevent any displacement during the placing of concrete. Tack welding or welding of crossing bars shall not be allowed. The engineer or inspector must approve the site and reinforcement prior to the placing of concrete. Reinforcement shall be placed so as to meet the requirements of ACI standard code (ACI 318 latest edition), Section 7.7.

The developer/contractor shall use concrete or steel chairs for holding the steel away from the subgrade, and spreader or other type of bars for securing the steel in place. The spreader bars shall not be less than three-eighths-inch in diameter. Reinforcement shall be clean; any rust, oil, mortar, dirt, etc., shall be removed before placing of concrete

3.

Epoxy coated reinforcing steel. Ensure that epoxy coating applicator has concrete reinforcing steel, institute (CRSI) fusion bonded epoxy coating applicator plant certification. Only those bars required by the approved plans shall be coated. Bent bars shall be coated after bending. Epoxy coated bars that are to be cut in the field shall be either sawed or sheared but shall not be flame cut. The sawed or sheared end and all other damaged coating shall be repaired using a specified patching or repair material approved by the manufacture for epoxy coating repair. Epoxy coated bars shall be handled and stored in a manner to prevent damage to bars or coating. All systems for handling coated bars shall have padded contact areas wherever possible. All bundling bands shall be padded and all bundles shall be lifted with. strong back, multiple supports or a platform bridge so as to prevent bar to bar abrasion due to sagging in the bar bundle. The bars or bundles shall not be dropped or dragged.

J.

Storage of materials.

1.

Storage of cement and aggregates. Cement and aggregates shall be stored in such a manner as to prevent deterioration or intrusion of foreign matter.

2.

Deteriorated or contaminated material. Any material that has Deteriorated or has been contaminated shall not be used for concrete.

3.

Storage of steel reinforcement. Steel reinforcement stored at the site of the work shall be stored above the ground surface on platforms, skids or other supports and shall be protected from dirt, mechanical injury and corrosion.

(Ord. No. 2007-07-31, §§ 12.2—12.2.10.3, 7-10-2007)