Attach 2 - C05 Stove Prairie Concrete Specs FP 24 Section 601.pdf

Section 601

Section 601. — MINOR CONCRETE

Description

601.01 This work consists of constructing minor concrete.

Material

601.02 Conform to the following Section and Subsections:

Coarse aggregate for concrete 703.02 Color coating 725.15 Concrete curing material and additives 711 Fine aggregate for concrete 703.01 Hydraulic cement 701.01 Penetrating stain for concrete 719.05 Pozzolans 701.03 Reinforcing steel 709.01 Sealants, fillers, and seals 712.01 Water for cementitious materials 725.01(a)

Construction Requirements

601.03 Composition (Concrete Mix Design). Conform to Table 601-1. Before batching concrete, submit the proposed concrete proportions for approval on Form FHWA 1606, Minor Portland Cement Concrete Mix Design or other approved form. As a minimum, submit the following at least 30 days before production:

(a) Concrete. Include the following in each mix design submittal:

(1) Type and sources of material;

(2) Material certification for material;

(3) Saturated surface dry mass of the fine and coarse aggregate per cubic yard of concrete;

(4) Gradation of fine and coarse aggregate;

(5) Mass of mixing water per cubic yard of concrete;

(6) Mass of cement per cubic yard of concrete. Fly ash, ground iron blast-furnace slag, or silica fume (micro-silica) may be substituted for cement according to Table 552-2;

(7) Entrained air content of plastic concrete in percent by volume; and

(8) Maximum slump of plastic concrete in inches.

(b) Integral colored admixture. If integral color admixture is used, prepare five 2- by 2-foot test panels. Construct the test panels using the proposed mix design. Determine coloring agent batch amounts by weight. Use variable quantities of coloring agent as approved. Provide additional mixing time according to the manufacturer’s recommendations. Cure the test panels similar to the structure.

Transport the panels to an approved location. Provide at least 2 weeks outside exposure. The CO will select the acceptable test panel. Use the same rate of integral color admixture for the item of work.

Table 601-1 Composition of Minor Concrete

Property Specification

Water to cementitious material ratio 0.49 maximum

Air content 4% minimum Size of coarse aggregate AASHTO M 43 with 100% passing the 1½-in sieve

28-day compressive strength 4000 psi minimum

601.04 General. Excavate and backfill according to Section 209.

Design and construct forms that are free of bulge and warp and allow for removal without injuring the concrete. Design the forms for a lateral pressure equal to that exerted by a fluid weighing 150 pounds per cubic foot.

Use wood, metal, or other suitable material for forms. Keep forms clean and coat with a form release agent or form oil before placing concrete.

Place and fasten reinforcing steel according to Subsection 554.08.

601.05 Placing Concrete. Conform to Subsection 552.07. Moisten the forms and foundation immediately before placing concrete. Discharge concrete within the time limit shown in Table 552-5.

Place concrete to avoid segregation of material. Consolidate with vibrators according to Subsection 552.08(c). Do not use aluminum pipe for transporting or placing concrete. Do not exceed 30 minutes between deliveries of batches for a single pour on a structure.

Do not apply water to plastic concrete surfaces during finishing operations.

601.06 Curing and Finishing of Concrete. Cure concrete at least 7 days. Cure according to Subsection 552.13. Finish exposed concrete surfaces according to Subsection 552.14 as applicable.

Do not place backfill against concrete until 80 percent of the design strength is attained. Construction loads less than 4000 pounds may be placed on the concrete when 80 percent of the design strength is attained.

Remove and replace cracking, spalling, or scaling concrete to the nearest joint.

601.07 Acceptance. See Table 601-2 for sampling, testing, and acceptance requirements.

Material for minor concrete including concrete, reinforcing steel, and structural steel for minor structures will be evaluated under Subsections 106.02 and 106.03.

The concrete mixture’s density, air content, slump, temperature, and compressive strength will be evaluated under Subsections 106.02 and 106.04.

Construction of minor concrete will be evaluated under Subsections 106.02 and 106.04.

Excavation and backfill will be evaluated under Section 209.

Measurement

601.08 Measure the Section 601 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable:

When concrete is measured by the cubic yard, measure in the structure.

Payment

601.09 The accepted quantities will be paid at the contract price per unit of measurement for the Section 601 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

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