for Highway Construction Page 646 of 71 5 SECTION 705 – GROUT AND MORTAR
705.01 Grout , Type A.
Type A grout is portland cement and water, containing an approved expansion admixture or compound. The 28- day compressive strength of grout cubes must be at least 4,000 psi when cured and tested in accordance with AASHTO T 106, except confining cover plates are to be clamped on the molds immediately after filling and left on the molds for at least 20 hours.
A.Portland Cement . Provide portland cement as specified in 701. Ensure cement used for grouting does not contain lumps or other indication of hydration or “pack set.”
B.Water. Use water that is potable, clean, and without injurious quantities of substances known to be harmf ul to portland cement , aggregate , or prestressing steel as specified in 720.01.
C.Admixtures . Use admixtures that impart the properties of low water content, good flowability , and minimum of bleed and expansion properties. The grout must expand at least 5 percent but less than 10 percent as determined by expansion of grout above the mold during cure as measured at the center of the specimen. Make a separate, unco nfined specimen for this purpose. Use formulations that do not contain chemical in quantities that may have harmful effects on the prestressing steel or cement. Do not use admixtures containing chlorides, fluorides, sulphites, and nitrat es.
D.Mixing of Type A Grout . Add water to the mixer first, followed by portland cement . Mix the grout until a uniform, thoroughly blended grout is obtained without excessive temperature increase or loss of expansive properties of the admixture. Continuously agitate the grout until it is pumped. Do not add water to the grout to increase flowability that has been decreased by delayed use of the grout. Base proportions of materials on tests made on the grout before grouting. The water content must produce a flow time of at least 11 seconds as determined by ASTM C939. Provide test reports from a commercial laboratory confirming properties of grout made with materials supplied.
705.02 Grout , Type B.
Provide class as specified.
A.Class I, Nonmetallic, Nonshrink. Obtain approval of the grout material before use and meet the following criteria:
1.Pre-blended, commercial product with a 28- day compressive strength of at least 5,800 psi.
2.Nonmetallic, nonshrink, water mixing compound containing portland cement , silica sand , or other agents (e.g., water reducers, plasticizers, fillers).
3.Does not use chlorides, fluorides, sulphites, or nitrates.
4.Meet ASTM C1107 Grade B or C and the following: for Highway Construction Page 647 of 71 5 a. When dried in air at 50 percent relative humidity for 28 days after standard 28- day moist cure, present 0.3 percent or less expansion from beginning of cure.
b.Zero percent shrinkage.
c.Submit test data report to verify compliance. Strictly observe the manufacturer’s written instructions regarding mixing, maximum water content, application, curing temperatures, and curing conditions. Sandblast grout areas.
B.Class II, Metallic, Non -shrink . Obtain approval before use and meet the requirements of Type B Class I, except the Engineer may all ow metallic aggregates. Do not use for pumping applications or where discoloration would be objectionable. Do not vibrate metallic aggregate grouts.
705.03 Grout , Type C.
Obtain approval before use. Type C grout is a 2 component, 100 percent reactive epoxy system that is volumetrically stable. Minimum required compressive strength in 24 hours is 5,800 psi. Strictly observe the manufacturer’s written instructions as to mixing and blending, aggregate gradation and dryness, and application and curing temperatures. Sandblast grout areas.
705.04 Grout , Type D.
Type D grout is 1 part portland cement and 2 parts fine concrete sand by volume containing only enough water to allow placing and packing. Provi de materials that meet 701 and 703. The Engineer may waive the gradation requirements of 703.02.B to allow a f iner-textured grout . Clean grout surfaces of loose or foreign material that would prevent a bond between the grout and the base concrete . Flush grout areas with water and dry surface before placing the mixture. Cure using water or other approved method as specified in 502.03. Remove defective grout and replace at no additional cost to the Department. for Highway Construction Page 648 of 71 5 SECTION 706 – PIPE
706.01 General Requirements for Concrete Pipe .
Provide test results for strength, absorption, and hydrostatic pressure for concrete pipe from the manufac turer. Only use manufacturers of precast concrete products that hold current certification under the NPCA Plant Certification Program, the ACPA QCast Plant Certification Program, or the PCI Plant Certification Program.
706.02 Concrete Sewer Pipe .
Meet AASHTO M 170 for the strength classes specified for round concrete pipe. Meet AASHTO M 207 for the strength classes specified for elliptical concrete pipe .
706.03 Concrete Pipe for Irrigation or Drainage .
Meet AASHTO M 170 for the strength classes specified for round concrete pipe. Meet AASHTO M 207 for the strength classes specified for elliptical concrete pipe .
706.04 Reinforced Concrete Culvert , Storm Drain, and Sewer Pipe .
Meet AASHTO M 170 for the strength classes specified for round concrete pipe. Meet AASHTO M 207 for the strength classes specified for elliptical concrete pipe. Add to AASHTO M 170 Table 4 (Wall A): Table 7 06.04- 1 – Additions to AASHTO M 170 Table 4 Internal Diameter Wall Thickness A Area Steel (a) Reinforcement Type 33 in 2⅞ in 0.38 in2/ft Elliptical 36 in 3⅛ in 0.42 in2/ft Elliptical 42 in 3¾ in 0.49 in2/ft Elliptical 48 in 4⅛ in 0.60 in2/ft Elliptical
a.Per unit length of pipe wall. Add to Table 5 (Wall A) of AASHTO M 170: Table 706.04- 2 – Additions to AASHTO M 170 Table 5 Internal Diameter Wall Thickness A Area Steel (a) Reinforcement Type 12 in 2 in 0.11 in2/ft Circular 15 in 2 in 0.21 in2/ft Circular 18 in 21/4 in 0.30 in2/ft Circular 21 in 23/8 in 0.39 in2/ft Circular 24 in 21/2 in 0.54 in2/ft Circular 27 in 25/8 in 0.50 in2/ft Elliptical
Source: Idaho Standard Specifications for Highway Construction, 2023 Edition. Pages 682–683 of 768.