for Highway Construction Page 368 of 71 5 SECTION 509 – NONSTRUCTURAL CONCRETE
509.01 Description.
Provide nonstructural portland cement concrete . Nonstructural portland cement concrete is concrete used in curb, sidewalk , gutter, small sign post foundations, or other applications where long term s tructural durability is not critical. Submit a proposed mix design using ITD -0916 for approval. Use the concrete class as specified.
A.Classification. Provide Class 30 concrete unless otherwise specified. Use size No. 2a or 2b coarse aggregate for all c lasses of concrete. Provide concrete in accordance with Table 509.01- 1. Table 509.01 -1 – Basic Mix Design Parameters Concrete Class in 100 psi (28 day) (a) Maximum Water To Cement Ratio (b) Air Content Percent 35 and greater (c) 0.45 0 - 6 30 0.50 6.5 ± 1.5 22 0.60 0 - 6 15 0.60 0 - 6
a.Numerical part of class designation is the specified compressive strength when tested as specified in the applicable test listed in 509.02.
b.Cement plus secondary cementitious materials , if used.
c.Ensure concrete designated as: 1. Class A: the air content of 6.5 plus or minus 1.5 percent.
2.Class C: has a maximum water cement ratio of 0.38, water reducer required, and air content of 6.5 plus or minus 1.5 percent. Use SCM for concrete use when designated with an “F.” This designation shows a mix containing SCM and meeting the requirements for an “A” or “C” mix as specified when used with the above designations. Meet requirements of 714. If fly ash is used, d o not exceed 35 percent of the total cementitious material (fly ash + cement). If ground granulated blast furnace slag (GGBFS) is used, do not exceed 35 percent of the total cementitious materials. If a combination of GGBFS and fly ash is used, ensure the combination is at least 20 percent or more than 50 percent of the total cementitious materials. Use size Nos. 2a or 2b coarse aggregate in any class of concrete. Ensure the slump does not vary more than 1 inch from the average during placement. If an increase in slump is desirable for the concrete as batched, maintain the weight ratio of water to cement by either making proportional increases of cement with increases in water or by reducing the total weight of aggregates incorporated in the mixture. for Highway Construction Page 369 of 71 5 B. Acceptance. Submit certification for concrete classes required to meet 509 from qualified aggregate material supplies. For each concrete mix design regardless of the pay item in the c ontract , test the first load, then again before reaching 50 cubic yards. Test again before reaching 100 cubic yards and again within every 100 cubic yards thereafter. Test for slump, unit weight, air content, and compressive strength for acceptance. Acceptable concrete is based on compliance with parameters specified for the given concrete class. The Engineer will determine acceptable strength from the results of 28- day compressive strength tests performe d on cylinders made from samples of the concrete being placed, as specified in 509.02. The average strength from 3 companion cylinders is 1 test. If the 28 -day strength falls below the specified minimum strength, the Engineer may reject the concrete represented by the test or require a price adjustment if allowed to remain in place. Concrete subject to rejection or price adjustment is represented by the test that falls below the specified strength. Replace unacceptable concrete at no additional cost to the Department. If the concrete does not meet the intended strength or air content, and the Engineer allows the concrete to remain in place, the price will be adjusted as shown in Table 509.01- 2 and/or Table 509.01- 3. Table 509.01- 2 – Pay Factor Adjustment for Strength Percent of Specified Strength Pay Factor ≥ above 90 to < 100 0.75 < 90 Subject to rejection(a)
a.If allowed to remain in place, as determined by the Engineer, the pay factor will be 0.50. Table 509.01- 3 – Pay Factor Adjustment for Air Content Above or Below Specified Air Content Pay Factor Less than 0.25% 0.99 0.50 to 0.25% to 0.50% 0.90 Above 0.50% Subject to rejection(a)
a.If allowed to remain in place, as determined by the Engineer, the pay factor will be 0.50. Acceptable quantities will be paid at the contract unit price multiplied by the pay factor as determined above. The Department will apply the larger price adjustment if air content and strength do not meet requirements. If concrete used in the work does not meet the specifications, make corrective changes in the materials mix portions, concrete fabrication procedures, or other corrective action before continuing, at no additional cost to the Department. Obtain approval to make corrective changes if the 7- day strength test results are low or show a downward trend predicting concrete may not meet the requirements. Manufacturers providing precast concrete products must hold current certification under the NPCA plant certification program, the ACPA QCast Plant Certification Program, or the PCI Plant Certification program.
509.02 Materials.
Provide materials as specified in: for Highway Construction Page 370 of 71 5 Portland Cement ........................................................................................................................... 701 Aggregate ..................................................................................................................................... 703 Air Entraining Admixtures ........................................................................................................ 709.03 Set Ret arding Admixtures ........................................................................................................ 709.04 Water Reducing Admixtures .................................................................................................... 709.05 Lithium Nitrate Admixtures ....................................................................................................... 709.06 Secondary Cementitious Materials ............................................................................................... 714 Water ....................................................................................................................................... 720.01 The Engineer will accept nonstructural concrete from qualified concrete suppliers by certification . If it is deter mined that concrete aggregate is determi ned to be reactive for ASR according to 703.02, test the concrete mix for effectiveness of mitigation measures with either lithium admixtures or SCM using CRD- C 662 (Table 509.02- 1) or ASTM C 1293 (Table 509.02- 2). All results must be provided with the mix design submittal . Table 509.02 -1 - Characterizing Effectiveness of Mitigation in Concrete (CRD -C 662 ) Expansion at 28 days (%) Characterization Min Max 0 0.09 Acceptable 0.10 0.14 Uncertaina 0.15 N/A Not effectivea a: Retest using higher dose of mitigation Table 50 9.02-2 - Characterizing Effectiveness of Mitigation in Concrete (ASTM C 1293 ) Expansion at 2 years (%) Characterization Min Max 0 0.039 Acceptable 0.040 N/A Not effective Obtain approval of admixtures before use. All test results must be submitted with the mix design . Class 22 and Class 15 concrete will not require ASR mitigation measures.
509.03 Construction Requirements.
Ensure proportioning, equipment, handling, measuring, batching, mixing, delivery, forming, placing, finishing, and curing of concrete are as specified in 502.03, except as modified by this section . for Highway Construction Page 371 of 715 A. Proportioning. Submit a concrete mix design on an ITD -0916 and include com pressive strength data from the Contractor’s laboratory or an approved independent laboratory. Uniquely identify each submitted mix design. Submit the proportion of the ingredients for each mix design for Engineer review.
B.Discharge. If a set stabilizer meeting ASTM C494 is used, the Contractor may extend discharge time to 3 hours, but not exceed 500 total revolutions.
C.Temperature. Provide concrete with a temperature of at least 50°F and not more than 90°F at the time of placement .
509.04 Method of Measurement.
The Engineer will measure acceptably completed concrete work by the cubic yard or by the square yard using the dimensions specified or as directed. The volume occupied by the reinforcing steel , anchors, conduits, weep holes, H piling, or chamfers will not be deducted. The volume of concrete displaced by culverts or pi les, other than H piling, will be deducted.
509.05 Basis of Payment .
The Department will pay for acceptable quantities at the contract unit prices as follows: Pay Item Pay Unit Nonstructur al Concrete Class ____ ....................................................... CY or SY for Highway Construction Page 372 of 71 5 SECTION 510 – CONCRETE OVERLAY
510.01 Description.
Provide and place a latex -modified concrete or a silica concrete overlay .
510.02 Materials.
Provide materials as specified in: Aggregate ..................................................................................................................................... 703 Portland Cement ........................................................................................................................... 701 Water for Concrete .................................................................................................................. 720.01 Air-Entraining Admixtures ........................................................................................................ 709.03 Water -Reducing Admixtures .................................................................................................... 709.05 Silica Fume ................................................................................................................................... 714 Fly Ash .......................................................................................................................................... 714 Fibrillated Fibers ...................................................................................................................... 720.09
A.Certification . Provide certification of the silica fume or latex modifier, taken during production or transfer, stating the test results made on the material samples meet this specification. Submit certification and test reports, indicating typical values, before use of the material.
B.Sampling and Testing. The Engineer will sample the material proposed. The Engineer will test concrete as specified in 502.02.
C.Acceptance. The Engineer will reject portland cement , latex modifier, or silica that does not meet this specification. The Engineer will report the rejection to the Contractor promptly. In cases of dissatisfaction with the test results, the Engineer will allow the Contractor additional sampling and retesting. The Engineer’s acceptanc e of the concrete overlay will be based on compliance with parameters specified. The Engineer will determine acceptance of strength from the results of 28- day compressive strength tests, performed in compliance with 502.02, on cylinders made from samples of the concrete being plac ed. The average strength from 3 companion cylinders is 1 test. If the 28 -day strength falls below the specified minimum strength, the Engineer may reject the concrete represented by the test or require a price adjustment if allowed to remain in p lace. The Engineer will base acceptance on an evaluation of the necessary durability requirements of the concrete overlay . The Engineer may accept concrete that does not meet the specified minimum strength, at a reduced price if the strength is not more than 10 percent below the specified minimum strength. The Engineer will reject concrete represented by tests falling more than 10 percent below the specified minimum strength. Remove rejected concrete at no additional cost to the Department. The Engineer will adjust the price for the concrete overlay that does not meet the specified strength, but is allowed to remain in place as presented in Tabl e 510.02 -1.
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 404–407 of 768.