1-5-Exhibit D Technical Specifications CGC 26-3407.pdf

EXHIBIT D

TECHNICAL SPECIFICATIONS

Commercial Grade Concrete (CGC)

The 2021 Oregon Standard SpecificaƟons for ConstrucƟon, Technical SpecificaƟons as modified by the City of Bend Special Provisions, hereinaŌer referred to as “Standard SpecificaƟons,” are a part of this Price Agreement. General CondiƟons of the Standard SpecificaƟons does not apply to this Price Agreement(s).

2021 Oregon Standard Specifications for Construction (OSS)

Available from the ODOT website:

https://www.oregon.gov/odot/Business/Specs/2021_STANDARD_SPECIFICATIONS.pdf

Section 00440 - Commercial Grade Concrete

Comply with Section 00440 of the Standard Specifications modified as follows:

00440.00 Scope - DELETE

00440.10 Materials – Furnish materials meeting the following requirements:

Admixtures 02040 Aggregates 02690 Bonding Agents 02070 Cement 02010 Curing Materials 02050 Modifiers 02030 Grout 02080 Water 02020 Fiber 02045

00440.11 Proportions – Furnish, in writing to the Engineer, the proportions by weight of the following Materials before using any CGC:

Air entraining admixtures Cement Each size of aggregate Fly ash Other admixtures Water Fiber

00440.12 Properties of Commercial Grade Concrete –DELETE and REPLACE with the following mix designs:

a. Curb

i. 6.1 sack concrete mix (574 lb. cement) 4,000 psi min

ii. 0.45 w/c (±1%)

iii. 6.0% (±1.5%) Air entrainment

iv. F-100 Fiber (.5 bag per yard)

v. 3” max slump

vi. Slag 0-30% (optional)

vii. AEA 90 (optional)

viii. Water reducer (optional)

ix. Superplasticizer may be used (Like VMA 358)

b. Flat work

i. 6.1 sack concrete mix (574 lb. cement) 4,000 psi min

ii. 0.45 (±1%) water to cement ratio

iii. 6.0% (±1.5%) Air entrainment

iv. F-100 Fiber (.5 bag per yard)

v. 6” max slump

vi. Slag 0-30% (optional)

vii. AEA 90 (optional)

viii. Water reducer(optional)

ix. Superplasticizer may be used (Like VMA 358) (optional)

Any material for substitutions is on an approved equal basis.

00440.13 Field-Mixed Concrete - CGC mixed Work items listed in 00440.14(a) may be field-mixed conventionally, or by volumetric/mobile mixers conforming to ASTM C685. When approved, concrete sidewalks, concrete driveways, and other flat concrete surfaces may be field-mixed using volumetric/mobile mixers conforming to ASTM C685.

00440.14 Acceptance Sampling and Testing:

(a) General - Acceptance sampling and testing will be based on samples obtained at the site of placement from the discharge of the delivery vehicle. All sampling and testing shall be performed by a QCT.

Work Item Section Bollards Electrical Conduit Backfill Fence Post Footings Hydrant Thrust Blocks Irrigation System Thrust Blocks Mailbox Support Footings Outlet Protection Blocks Perforated Steel Square Tube Sign Support Footings

(b) Delivery Tickets - Send a delivery ticket with each load of CGC recording the source, Day, time of batch, size of load, and quantity of individual constituents in the load. Delivery tickets are not required for field-mixed concrete except when volumetric/mobile mixers are used.

(c) Plastic CGC - Acceptance of plastic CGC will be based on tests performed by the QCT according to the MFTP and 00440.12.

(d) Hardened CGC - Acceptance of the hardened CGC will be according to 00440.12. Cast one set of cylinders per 20 cubic yards, with a maximum of one set per Day.

00440.15 Quality Control - Provide quality control according to Section 00165.

00440.30 Quality Control Personnel - Provide technicians having CSTT and QCT technical certifications.

00440.40 Construction, General:

(a) Mixing - Mix CGC to the extent that ensures a uniform distribution of materials throughout the mixture.

(b) DELETE

(c) DELETE

(d) DELETE and REPLACE with the following:

Concrete is to be placed when the air temperature in the work zone is at least 35F. All concrete placed below 35F shall be approved under the following prescribed cold weather concrete plan:

- Concrete may be placed when the ambient air temperature is 25F and rising, and the projected day time temperature high will be above 35F for 2 days (unless otherwise approved by the City Engineer);

- Concrete shall not be poured below 25F;

- Concrete may not be poured on frozen ground;

- If subgrade is frozen, all frozen material must be removed and new compacted base must be placed before concrete is poured;

- Concrete subgrade must be inspected by the City prior to placing concrete;

- At a minimum, ambient temperatures from 30F to 40F hot water will be used to maintain concrete temperatures not less than 55F at placement;

- At a minimum, ambient temperatures from 25F to 30F hot water will be used to maintain concrete temperatures not less than 55F at placement and 1% non- Chloride accelerator;

- Provide batch tickets to City Engineering Inspector;

- The City may require the use of a Hi/low thermometer to record the temperature of the placed concrete for 7 days. Concrete must be maintained at 40F during this time;

- If concrete temperature falls below 40F the City may choose to have the concrete removed and replaced at the contractors/permittee expense, and;

- Prevent concrete from freezing for 7 calendar days after concrete is placed;

- At a minimum cover all concrete at night if the seven day forecast shows a potential for freezing. It is up to the contractor to determine the best practice for protecting the concrete.

Alternate cold weather concrete plans may be submitted for review but approval is at the City’s discretion.

(e) DELETE

00440.41 General Surface Finish - DELETE

00440.42 Replacement or Price Reduction - Remove concrete represented by cylinders that fail to meet the minimum strength requirement and replace at no additional cost to the Agency. If the Engineer determines that the low-strength concrete is suitable for the purpose intended, the Contractor may accept a price reduction established by the Engineer instead of removal and replacement.

00440.80 Measurement - No measurement of quantities will be made for CGC. Quantities will be established by accepted delivery tickets provided as noted above.

00440.90 Payment – The accepted quantities of CGC will be paid for at the contract unit price for CGC. The price per cubic yard shall be full compensation for furnishing CGC to the project site.

Adjustments to the per cubic yard price will be made for additions to the mix ordered by the City for which pricing is included in the Contract. No separate or additional payment will be made for admixtures not ordered by the City and for which pricing is not included in the Contract.