42 GROOVE AND GRIND CONCRETE
42-1 General
42-1.01 General
Section 42 -1 includes general specifications for grooving and grinding concrete roadway surfaces . Section 36 -1.01D(2) does not apply.
42-1.02 Materials
Not U sed
42-1.03 Construction
Do not store grooving or grinding residue within the highway.
42-1.04 Payment
Not Used
42-2 Grooving
42-2.01 General
42-2.01A Summary
Section 42 -2 includes specifications for grooving concrete roadway surfaces.
42-2.01B Defin itions
Reserved
42-2.01C Submittals
Reserved
42-2.01D Quality Assurance
42-2.01D(1) General
Reserved
42-2.01D(2) Department Acceptance
The Department accepts grooved areas if at least 95 percent of any 2 by 100 foot longitudinal pavement area is grooved except where prevented by irregularities in the pavement surface.
42-2.02 Materials
Not Used
42-2.03 Construction
At the start of each work shift, grooving machines must be equipped with a full complement of functioning grooving blades. Grooving blades must be 0.095 ± 0.005 inch wide and spaced on 3/4 -inch centers. Set blades and cut to depth at the locations shown in the following table: Location Groove depth (inches) Pavement 1/8–1/4 Bridge decks 1/8–3/16 Inductive loop detectors 1/16–1/8 Begin and end grooving at lines perpendicular to the roadway centerline. Center grooving within the lane width. For new pavement or bridge decks, groove the full lane width. If a single blade on a grooving machine fails to cut an acceptable groove, you may continue to groove for the remainder of the work shift. Do not regroove because of a single failed blade. If more than a single blade fails, perform either of the following:
1.Discontinue work within 50 feet of the failure. Cutting omitted grooves is not required. SECTION 42 GROOVE AND GRIND CONCRETE
2.Continue grooving until the end of the work shift. You must cut omitted grooves by other means.
42-2.04 Payment
Not Used
42-3 Grinding
42-3.01 General
42-3.01A Summary
Section 42 -3 includes specifications for grinding concrete roadway surfaces .
42-3.01B Definitions
Reserved
42-3.01C Submittals
Reserved
42-3.01D Quality Assurance
42-3.01D(1) General
Reserved
42-3.01D(2) Quality Control
Test for pavement smoothness under sections 36 and 40 except:
1.At the mi dpoint of a joint or crack, test smoothness with a straightedge.
2.Straightedge and inertial profiler requirements do not apply to areas abnormally depressed from subsidence or other localized causes. End smoothness testing 15 feet before and resume 15 fe et after these areas. After grinding, the existing pavement must comply with specifications for smoothness in section 40 except:
1.At the midpoint of a joint or crack, both sides must have uniform texture.
2.Cross -slope must be uniform and have positive drainage across the traveled way and shoulder.
42-3.01D(3) Department Acceptance
The Department accepts pavement for smoothness under section 40 -1.01D and texture as described under section 40 -1.03H(3) . For Department acceptance, the following ground areas must comply with the specifications for smoothness and concrete cover over reinforcing steel in section 51 -1.01D(3)(b)(ii):
1.Bridge decks
2.Approach slabs
3.Adjacent 50 feet of approach pavement After grinding bridge decks, approach slabs , and the adjacent 50 feet of approach pavement, the coefficient of friction must comply with section 51 -1.01D(3)(b)(iii).
42-3.02 Materials
Not Used
42-3.03 Construction
42-3.03A General
Grind surfaces in the longitudinal direction of the traveled way and grind the full lane width. Begin and end grinding at lines perpendicular to the roadway centerline. Grinding must result in a parallel corduroy texture with grooves from 0.08 to 0.12 inch wide and from 55 to 60 grooves per foot of width. Grooves must b e from 0.06 to 0.08 inch from the top of the ridge to the bottom of the groove. SECTION 42 GROOVE AND GRIND CONCRETE Grinding equipment must have diamond cutting blades mounted on a self -propelled machine designed for grinding and texturing concrete pavements. At joints or cracks, both sides must have a uniform texture.
42-3.03B Pavement
Grind existing concrete pavement that is adjacent to an individual slab replacement. Grind the replaced individual slab and all the existing slabs immediately surrounding it. Grind after the individual slab i s replaced. Grind existing concrete pavement that is adjacent to new lanes of concrete pavement before paving. As an alternative to grinding existing concrete pavement, you may replace the existing pavement. The new concrete pavement must be the same thick ness as the removed pavement. Replace existing pavement between longitudinal joints or pavement edges and transverse joints. Do not remove portions of slabs. Replacement of existing concrete pavement must comply with specifications for individual slab replacement in section 41 -9.
42-3.03C Bridge Decks, Approach Slabs, and Approach Pavement
Grind bridge decks, approach slabs, and approach pavement if described.
42-3.04 Payment
Grinding an existing approach slab and the adjacent 50 feet of approach pavement is paid for as grind existing bridge deck.
42-4 42-9 Reserved
43–44 RESERVED
Source: California Standard Specifications, 2024 Edition. Pages 663–666 of 1,372.