810Concrete Repair

Concrete Repair

810.1Concrete Patching Material

810.1.1 General

1 Ensure aggregate extension in accordance with the manufacturer’s recommendations; use aggregate in accordance with T able 810.1.1-1, Extension Aggregate Gradation Requirements.

Table 810.1.1-1 Extension Aggregate Gradation Requirements Sieve Size Percent Passing ⅜ in [9.50 mm] 100 No. 8 [2.36 mm] 0

810.1.2 Horizontal Repair Material

1 Provide and use a concrete repair product preapproved by the Materials Program or equivalent nonchloride, nonvapor barrier, high-alumina cementitious mortar in accordance with ASTM C-928-99a and Table 810.1.2-1, Horizontal Repair Material.

Table 810.1.2-1 Horizontal Repair Material Property Test Value Neat Material Compressive Strength ASTM C 109 5000 psi [35 MPa] in 24 hours 8000 psi [55 MPa] in 28 days Final Set - 25 minutes, min. Freeze/Thaw Resistance ASTM C 666 96% min. @ 300 cycles Drying Shrinkage ASTM C 596 0.13% max. @ 4 days With Maximum Aggregate Extension Compressive Strength ASTM C 39 4000 psi [28 MPa] in 24 hours 7000 psi [48 MPa] in 28 days Bond Strength ASTM C 882 Modified 2000 psi [14 MPa] in 24 hours

810.1.3 Vertical/Overhead Repair Material

1 Provide and use a concrete repair product preapproved by the Materials Program or equivalent nonchloride, nonvapor barrier, high-alumina cementitious mortar designed for vertical and overhead applications in accordance with ASTM C-928-99a and Table 810.1.3-1, Vertical/Overhead Repair Material.

Concrete Repair SECTION 810

Table 810.1.3-1 Vertical/Overhead Repair Material Property Test Value Neat Material Compressive Strength ASTM C 109 300 psi [28 MPa] in 24 hours 6000 psi [55MPa] in 28 days Final Set - 25 minutes, min Freeze/Thaw Resistance ASTM C 666 99% min. @ 300 cycles Drying Shrinkage ASTM C 596 0.13% max. @4 Days Bond Strength ASTM C 882 Modified 1500 psi [10 MPa] in 24 hours

810.2Bond-Breaking Compound

1 For bond breaking, provide and use liquid, membrane-forming, bond-breaking compound in accordance with AASHTO M 148 (ASTM C 309), type 2, class A or B, or other approved release agent. Obtain the engineer’s approval before use.

810.3Caulking Filler

1 For caulking filler, provide and use a standard commercial silicone sealer designed for concrete surfaces and containing at least 50 percent silicone.

810.4Foam Core Board

1 For filling joints, provide and use foam core board at least ⅜ in [10 mm] thick, with ½ in [12 mm] high × 1 in [25 mm] long tabs on top, and consisting of closed-cell foam faced on each side with poster board or plastic (referred to by office suppliers as “foam core”) or a dense closed- cell foam insulation faced with plastic or foil. If necessary, provide a thicker foam core board for transverse cracks or larger transverse joints.

810.5Dowel Bar Retrofit Concrete

1 Provide and use a concrete product pre-approved by the Materials Program or equivalent in accordance with Table 810.5-1, Dowel Bar Retrofit Concrete Material.

Concrete Repair SECTION 810

Table 810.5-1 Dowel Bar Retrofit Concrete Material Property Test Value Neat Material Compressive Strength ASTM C 109 3000 psi [21MPa] in 6 h 500 psi [34 MPa] in 24 h Shrinkage in 4 Days ASTM C 596 0.13 percent, max. Final Set 25 minutes, min. With Maximum Aggregate Extension Flexural Strength Calif. Test 551 500 psi [3.5 MPa] in 24 h Bond to Dry PCCP Calif. Test 551 400 psi [2.5 MPa] in 24 h Bond to Saturated Surface Dry PCCP Calif. Test 551 300 psi [2.1 MPa] in 24 h

2 Provide and use coarse aggregate extension in accordance with Subsection 803.2.2, Course Aggregate, and T able 810.5-2, Dowel Bar Retrofit Concrete Gradation Requirements.

Table 810.5-2 Dowel Bar Retrofit Concrete Gradation requirements Sieve Size Percent Passing ⅜ in [9.50 mm] 100 No. 8 [2.36 mm] 0

3 Ensure a coarse aggregate extension no greater than eight parts coarse aggregate to ten parts dry patching material by weight [mass]. Provide dry patching material consisting of the manufacturer’s cementitious material and fine aggregate. If the fine aggregate is not included as part of the manufacturer’s product, blend it with the cementitious material at a proportion recommended by the manufacturer and approved by the engineer. Use fine aggregate in accordance with Subsection 803.2.1, Fine Aggregate.

810.6Epoxy Resin

1 For repairing concrete with epoxy resin, provide and use materials in accordance with the following:

ASTM C 881, type IV, grade 1 Viscosity < 300 cps at 73 °F

ASTM C 881, type V, grade 2 Ensure gel time does not exceed installation time at placement temperature.

Concrete Repair SECTION 810

ASTM C 881, type IV, grade 3